A flask with a volume of 250.0 mL contains air with a density of 1.126 g/L. The mass of the air contained in the flask is 0.28 gram.
What do you mean by density ?The density of a material is the measure of how tightly it is packed together. It is expressed as mass per unit volume. Density Symbol is D or
Formula Density = m/V, where is the density, m is the object's mass, and V is the object's volume.
Given:
Volume = 250.0 mL
Convert 250.0 mL in Liters :
250. 0 / 1000 = 0,25 L
Density = 1.126 g/L
Mass = g ?
Mass = Density × Volume
Mass = 0.25 × 1.126
Mass = 0.28 gram
Thus, the mass of the air contained in the flask is 0.28 gram.
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QUESTION 1
What does Group number tells you about the atoms in that Group?
a. number of valence electrons
b. the maximum number of electrons atoms in this Group can accept or give away
c. similarity of properties for the elements in this Group
d. all answers are correct
QUESTION 2
What does a period number tell you about the elements in that period?
a. number of principal energy levels
b. number of valence electrons c.maximum number of electrons atoms can accept or give up
1) number of valence electrons
2) number of principal energy levels
What is the periodic table?The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and chemical properties. It is a useful tool for predicting the chemical behavior of an element and helps in understanding the relationships between elements and their chemical and physical properties.
The periodic table consists of rows and columns, where each element is placed in a specific position based on its atomic number and electron configuration. The elements in the same row (period) have similar electron configurations and exhibit similar chemical behavior, while the elements in the same column (group) have similar chemical and physical properties.
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Question 2
Lead, and chromium are all examples of which of the following?
O organic chemicals
O acids
O heavy metals
O compounds
Lead is one example of a heavy metal. Cobalt and cadmium. They belong to a class of chemicals known as "heavy metals". The answer is option (c).
Is lead a heavy metal?Lead is one example of a heavy metal. Cobalt and cadmium. They belong to a class of chemicals known as "heavy metals." Metallic substances with a relative high density when compared to water are referred to as heavy metals. Assuming that weight and toxicity are connected, heavy metals have included metalloids like arsenic, which can cause toxicity at low exposure levels.
Although heavy metals are generally found in nature and are necessary for life, they can become poisonous when they build up in organisms. Among the heavy metals that can poison the environment, arsenic, cadmium, and mercury are the most prevalent.
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The common pain relievers – aspirin (C9H8O4), acetaminophen (C8H9NO2), and naproxen sodium (C14H13O3Na) – are available in tablets containing 229 mg of the active ingredient. Express your answers to three significant figures.
229 mg aspirin = _____ C9H8O4 molecules
229 mg acetaminophen = _____ C8H9NO2 molecules
229 mg naproxen sodium = ______ C14H13O3Na molecules
The number of molecules for 229 mg
Aspirin is 7.66 × 10²⁰ molecules.Acetaminophen is 9.13 × 10²⁰ molecules.Naproxen sodium is 5.47 × 10²⁰ molecules.The atomic mass from
C = 12 g/molH = 1 g/molN = 14 g/molO = 16 g/molNa = 23 g/molMolecular mass is the sum of all the atomic mass in the compound.
Aspirin C₉H₈O₄According to Stoichiometry to calculate the number of moles of a compound
n = m ÷ M
X = n × L
n = number of molesm = mass (grams)Calculating the number of molecules
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one mole of carbon weighs 12 grams reacts with one mole of oxygen gas weighing 32 grams to produce only carbon dioxide according to the equation
One mole or 12 g of carbon reacts with one of oxygen molecule weighs 32 g will produce one mole of carbon dioxide. One mole of carbon dioxide weighs 44 g.
What is carbon dioxide ?Carbon dioxide is an inorganic gas formed by the covalent bonding between carbon and oxygen gas. Carbon dioxide is an essential gas to maintain the living atmosphere in earth.
The balanced chemical equation of the reaction between oxygen gas and carbon is given below:
[tex]\rm C+O_{2} \rightarrow CO_{2}[/tex]
As per this equation, one mole of carbon reacts with one mole of oxygen gas:
Atomic mass of carbon = 12g
molecular mass of oxygen = 32 g
then molar mass of carbon dioxide = 32+ 12 = 44 h=g.
Therefore, 44 g of carbon dioxide is produced in this reaction.
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Please answer the question OR ELSE... you will get one of those long hairs stuck in your nose and it will never come out
2KClO3 --> 2KCl + 3O2
If 5.0g KClO3 of is decomposed, how many grams of KCl are producted?
Question 2 options:
1.4 L
3.6 L
7.0 L
5.0 L
The amount, in grams of KCl that will be produced, would be 5.00 grams.
Stoichiometric problemKClO3 decomposes when heated to produce KCl and O2 according to the following equation:
[tex]2KClO_3 -- > 2KCl + 3O_2[/tex]
Equivalent mole of 5.0 g KClO3 = 5/122.5 = 0.0408 mol
Since the mole ratio of KClO3 to KCl is 1:1, the mole of KCl formed will also be 0.0408 mol.
Mass of 0.0408 mol KCl = 0.0408 x 122.55
= 5.00 grams
In other words, the mass of KCl that would be produced is 5.00 grams.
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If you do not answer this you will feel bad for not answering it. Then hopefully you will come back and answer it.
N2SO4 + 2NaOH --> H2O + Na2SO4
How many molecules of water are produced if 2.0g of sodium sulfate are produced in the reaction above?
Question 3 options:
8.5 x 1021 molecules
8.5 x 1023 molecules
6.77 x 1022 molecules
2.0 x 1023 molecules
The balanced chemical equation for the reaction is:
N2SO4 + 2NaOH → Na2SO4 + 2H2O
From the equation, we can see that for every 1 molecule of sodium sulfate (Na2SO4), 2 molecules of water (H2O) are produced. Therefore, to find the number of molecules of water produced, we need to determine the number of molecules of sodium sulfate produced in the reaction.
To do this, we need to use the molar mass of sodium sulfate and Avogadro's number. The molar mass of sodium sulfate is 142.04 g/mol, and Avogadro's number is 6.022 x 10^23.
The number of molecules of sodium sulfate produced in the reaction can be calculated as follows:
(2.0 g) / (142.04 g/mol) = 0.01405 mol
And the number of molecules of water produced can be calculated as follows:
0.01405 mol x 2 molecules/mol = 0.0281 x 6.022 x 10^23 molecules/mol = 1.69 x 10^23 molecules
Round 1.69 to 2.0 and your answer is 2.0 x 1023 molecules
The molal boiling point elevation constant Kb=1.28, for a certain substance X. When 16. g or urea are dissolved in 150. g of X, the solution boils at 148.8 C. Calculate the boiling point of pure X.
the boiling point of pure X is 146.52 C.
As
ΔTb = Kb × m
ΔTb = Elevation in boiling point = Tb - T°b
m = Molality
So,
Tb - T°b = Kb × [tex]\frac{Wb . 1000}{Wa . Mb}[/tex]
Kb = 1.28
Wb = 16g of urea given
Wa = 150g of X
Mb = 60g = Molar mass of urea
Tb = 148.8 C
Putting values in Equation,
We get, the boiling point of pure X as 146.52 C.
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1. The 0.9 g sample of ascorbic acid (vitamin C) was dissolved in 95 g of water. The concentration of ascorbic acid, as determined by freezing-point depression, is 0.0555 m. What is the molecular weight of the ascorbic acid?
The molecular weight of the ascorbic acid (vitamin C), given that 0.9 g of the acid was dissolved in 95 g of water is 170.7 g/mol
How do I determine the molecular weight of the ascorbic acid?We'll begin by obtaining the mole of the ascorbic acid in the solution. Details below
Mass of water = 95 g = 95 / 1000 = 0.095 KgMolality of solution = 0.0555 MMole of ascorbic acid =?Mole = Molality × mass of water (in kg)
Mole of ascorbic acid = 0.0555 × 0.095
Mole of ascorbic acid = 0.0052725 mole
Finally, we shall determine the molar mass of the ascorbic acid. Details below
Mole of ascorbic acid = 0.0052725 moleMass of ascorbic acid = 0.9 gMolar mass of ascorbic acid =?Molar mass = mass / mole
Molar mass of ascorbic acid = 0.9 / 0.0052725
Molar mass of ascorbic acid = 170.7 g/mol
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Look at the window on the left side of the simulation. It shows the reaction A + BC ⇌ AB + C. How does this reaction differ from the reaction by which ammonia is synthesized?
A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".
What is a single replacement reaction?A single replacement reaction is a reaction by which one element replaces an/another element in a compound.
It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
A chemical reaction known as a synthesis occurs when two or more simple chemicals combine to create a more complex result. The result is always a chemical, while the reactants can be either elements or other compounds.
Example: ammonia synthesis,
N₂ + 3H₂ ⇄ 2NH₃
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Identify the kind of intermolecular forces that would occur between the solute and solvent in each case.
A. Butter
B. Kerosene
C. Ethanol
D. Calcium Fluoride
The intermolecular force present in butter is London dispersion forces. In kerosene, covalent bonding between carbon and hydrogen atoms are present.
What is intermolecular force ?Intermolecular forces are force exerted between two molecules which can be of attraction or repulsion. The intermolecular force of attraction make the atoms binded in a compound or molecule.
In butter, the hydrocarbon molecules exerts a London dispersion forces between two non-polar molecules. In kerosene, the hydrocarbon molecules are bound by covalent bonding between carbon atoms.
In ethanol, the OH group make it possible to form hydrogen bonds between ethanol molecules. In the case of calcium fluoride, dipole, dipole forces exists. Since the compound is ionic and have a permanent dipole moment.
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Water can be decomposed into its constituent elements, 2 H2O(l) → 2 H2(g) + O2(g), with an electrical current in a process called electrolysis. If 1.2 g of H2O is subjected to electrolysis and the products are collected in a cylinder with a volume of 0.20 L and a temperature of 30 °C, what is the partial pressure of H2?
The number of moles of hydrogen gas produced from 1.2 g of water is 0.06 moles. Then, the partial pressure of hydrogen gas is 4.9 atm.
What is partial pressure ?The partial pressure of a gas in a mixture is the contribution of the gas to the total pressure of the mixture.
The molar mass of water = 18 g/mol
mass = 1.2 g
number of moles = 1.2/18 =0.06 moles.
now the total pressure p = nRT/v
V = 0.20 L
T = 30°C =303 K
then p = (0.06 mol × 0.082 L atm/ K mol × 303 K) / 0.20 L = 7.4 atm.
Now, 2 moles of water gives 2 moles of hydrogen gas and one mole of oxygen. Then 0.06 moles of water gives 0.06 moles of hydrogen and 0.03 moles of oxygen.
Then, mole fraction of hydrogen = 0.06/(0.03 + 0.03) = 0.66.
Partial pressure of hydrogen = total pressure × mole fraction
= 0.66 × 7.4 atm = 4.9 atm.
Therefore, the partial pressure of hydrogen gas is 4.9 atm.
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What is the percent of O in
Ca(C2H302)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
[?]% O
Round your answer to the hundredths place.
% O
Ca(C2H3O2)2 has 30.41% carbon by volume, according to calculations.
How can the percentage of an element in a compound be calculated?By dividing the atomic mass of the element by the molar mass of the compound, then by 100%, one can get the percentage of the element in a compound.
The percentage form of the mixture is obtained by multiplying this ratio by 100.
By dividing the atomic mass of the element by the molar mass of the compound, then by 100%, one can get the percentage of the element in a compound.
Atomic mass of C divided by the molar mass of Ca(C2H3O2) yields the percentage of carbon.
₂ × 100%
Ca(C2H3O2)2 has an atomic mass of 40 plus (24 plus 3 plus 32).
2 = 158g/mol \s % C = 12.01(4)/158 × 100 \s % C = 30.41%.
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In the PhET activity, "Properties of Gases", when pressure is kept the same and heat
the amount of gas decreases
the volume decreases
the rate of collisions decrease
the volume increases
In the PhET activity, "Properties of Gases", when pressure is kept the same and heat the volume increases. Therefore, option D is correct.
What is charle's law ?Charles' law states that if the pressure remains constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature.
This law states that a gas's volume and temperature have a direct relationship: as temperature rises, volume rises when pressure remains constant. When a gas is heated, the kinetic energy of the particles increases, causing the gas to expand.
Thus, option D is correct.
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A 367.8 g sample of potassium chlorate (molar mass = 122.55g/mol) was decomposed according to the following equation:
2KClO3 -->2KCl + 3O2 How many moles of oxygen are formed?
a
3.000 mol
b
4.502 mol
c
1.000 mol
d
2.500 mol
According to the stoichiometry of the given chemical equation, there are 4.502 mole of oxygen formed.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
As per the equation 2 moles of potassium chlorate give 3 moles of oxygen , thus 367.8 g sample of potassium chlorate is 367.8/122.55=2.99 moles 2.99 moles of potassium chlorate will give 2.99×3/2=4.502 moles.
Thus, there are 4.502 mole of oxygen formed.
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With which of the following ions would you expect a color change after the addition of acidified potassium permanaganate? Select all that apply.
nitrite
nitrate
carbonate
sulfite
sulfate
phosphate
chromate
The nitrite and sulfite ions would change the colour after the addition of acidified potassium permanganate. Therefore, option A and D are correct.
What do you mean by an ion ?An ion is a positively charged atom or molecule. It is charged because the number of electrons in the atom or molecule does not equal the number of protons.
Depending on whether the number of electrons in an atom is greater or less than the number of protons in the atom, an atom can acquire a positive or negative charge.
When potassium permanganate crystals are dissolved in water, a purple solution is formed. It is a strong oxidizing agent that does not produce toxic byproducts. It's usually made from other minerals like manganese oxide.
Thus, option A and D are correct.
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5.6 mol N2O5
Express your answer using two significant figures
Mole is one of the International System of Units' seven foundation units, in reality (SI). Units are created when preexisting ones are insufficient. Therefore, 11.2moles of NO[tex]_2[/tex] is produced.
What is mole?Simply put, a mole is a measuring unit. It's one of the International System of Units' seven foundation units, in reality (SI). Units are created when preexisting ones are insufficient.
At the same time that using official figures of atoms, molecules, or ions would be unclear, chemical reactions frequently occur at low concentrations where using grams would've been inappropriate. Therefore, the mole was created by scientists to fill the gap between extremely small and extremely huge quantities.
2N[tex]_2[/tex]O[tex]_5[/tex](g)→4NO[tex]_2[/tex](g)+O[tex]_2[/tex](g)
moles of N[tex]_2[/tex]O[tex]_5[/tex] = 5.6 mol
the mole ratio between N[tex]_2[/tex]O[tex]_5[/tex] and NO[tex]_2[/tex] is 1:2
moles of NO[tex]_2[/tex] = 2× 5.6=11.2moles
Therefore, 11.2moles of NO[tex]_2[/tex] is produced.
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I need help answering these
How many significant figures are in each of the following numbers?
a. 225.0
c. 0.0003210
b. 1000.0
d. 0.0067
e. 1,000,000.
f. 2.00001
Round off each of the following numbers to three significant figures.
a. 15.9994
c. 0.6654
e. 87,550
b. 1.0080
d. 4885
f. 0.027225
3. Perform the indicated arithmetic operations, and round the results to the appropriate number of significant figures or decimal places.
a. 77.981 x 2.33
b. 4 x 0.0665 =
c. 17.344.900 + 23.1
d. 9.80 4.762 =
e. 3.9 X 6.05 X 420 =
f. 14.1/5
g. 1001 + 16.23 =
h. 424.5+ 2.8461 =
i. 9.9-9.54
j. 7.3778 0.000265 =
k. (24.358)(6.4)
1. (48.6)(0.6959)
a. 225.0 has 4 significant figures.
b. 1000.0 has 4 significant figures.
c. 0.0003210 has 6 significant figures.
d. 0.0067 has 4 significant figures.
e. 1,000,000 has 7 significant figures.
f. 2.00001 has 6 significant figures.
Question 2
a. 15.9994 rounded to three significant figures is 16.0.
b. 1.0080 rounded to three significant figures is 1.01.
c. 0.6654 rounded to three significant figures is 0.665.
d. 4885 rounded to three significant figures is 4885.
e. 87,550 rounded to three significant figures is 88,000.
f. 0.027225 rounded to three significant figures is 0.0272.
Question 3
a. 77.981 x 2.33 = 181.081 (rounded to 3 significant figures)
b. 4 x 0.0665 = 0.266 (rounded to 3 significant figures)
c. 17,344,900 + 23.1 = 17,344,923.1 (rounded to 7 significant figures)
d. 9.80 - 4.762 = 5.038 (rounded to 3 significant figures)
e. 3.9 x 6.05 x 420 = 8,595.89 (rounded to 2 decimal places)
f. 14.1 / 5 = 2.82 (rounded to 2 decimal places)
g. 1001 + 16.23 = 1017.23 (rounded to 4 significant figures)
h. 424.5 + 2.8461 = 427.3461 (rounded to 4 decimal places)
i. 9.9 - 9.54 = 0.36 (rounded to 2 decimal places)
j. 7.3778 / 0.000265 = 27,864.345 (rounded to 3 decimal places)
k. (24.358) x (6.4) = 156.3712 (rounded to 4 decimal places)
(48.6) x (0.6959) = 33.88594 (rounded to 5 decimal places)
What is significant figures?Significant figures of a number in positional notation are described as digits in the number that are reliable and necessary to indicate the quantity of something.
Decimal places on the other hand are described as positions of the digits to the right of a decimal point. Rounding numbers to decimal places is shortening a decimal number to a given degree of accuracy.
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How do you prove the chemical formula for a covalent bond using Lewis dot structures?
Lewis structures are useful for visualizing both ionic and covalent bonds. In the idealized ionic bond.
Does Lewis's structure show covalent bonds?In covalent bonding, nonmetallic elements part electrons so that both elements can have a full valence shell. Covalent bonds can be meant with electron dot formulas. These are often mentioned as Lewis structures and are a little different than the electron dot formulas used to constitute ionic bonds.
Lewis one atom gives up an electron to the other, forming positive and negative ions. The state for bonds is that the total structure charge is zero and that each atom must have a gentle gas electron configuration. In covalent combination, the Lewis Dot Structures must show
So we can conclude that Using Lewis structure Symbols to relate Covalent Bonding.
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how do I calculate the number of oxygen atoms in a sample that has a mass of 288 amu's?
Explanation:
To calculate the number of oxygen atoms in a sample of 288 amu, you would need to know the atomic mass of oxygen and the chemical formula of the sample.
Assuming that the sample is made of pure oxygen (O2), the atomic mass of oxygen is 16 amu. So, 288 amu / 16 amu/atom = 18 atoms of oxygen.
When a cracker dissolves in your mouth, is that physical or chemical change?
When a cracker dissolves in your mouth, then this is a chemical change. A chemical reactions is an atomic rearrangement-based chemical process.
What is chemical change?An alteration of one or more compounds as one or maybe more new and distinct substances is referred to as a chemical change or chemical reaction. In other terms, a chemical reactions is an atomic rearrangement-based chemical process.
A chemical change normally cannot be reversed unless through additional chemical processes, although a physical change may frequently be done so. The power of the system changes when a chemical shift takes place. When a cracker dissolves in your mouth, then this is a chemical change.
Therefore, when a cracker dissolves in your mouth, then this is a chemical change.
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2. Which wave needs a medium to transfer energy?
A Longitudinal waves
B Transverse waves
C Electromagnetic Waves
D Both
The apparatus shown below can be used to investigate the electrolysis of brine. The gas collecting in the tube above the anode will be what colour?
In the electrolysis of brine, the gas collecting in the tube above the anode will be chlorine gas, which is greenish yellow in color.
What is electrolysis?Electrolysis is a process where an electric current is passed through a solution containing ions (called an electrolyte) to bring about a chemical reaction. This reaction splits the electrolyte into its component ions and distributes them to the electrodes (anode and cathode) connected to the source of electric current.
At the anode, negatively charged ions (anions) gain electrons and become neutral, while at the cathode positively charged ions (cations) lose electrons and become neutral. Chlorine gas is greenish yellow in color due to its chemical properties. When chlorine gas is formed at the anode during the electrolysis of brine, it is produced as a result of the oxidation of chloride ions (Cl-) present in the brine solution.
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3.00g of a compound dissolves in 30mL of water. This solution is extracted with 40mL of ether and are in the 2.00g ether phase of the compound. Calculate the distribution coefficient (Kd).
The distribution coefficient measures the ratio of a compound's ionized and non-ionized species in a solution. Therefore, 1.57 is the distribution coefficient.
What is distribution coefficient ?The distribution coefficient measures the ratio of a compound's ionized and non-ionized species in a solution of two separate immiscible phases. This phenomena can be designated as "D."
Here, water or perhaps an aqueous phase is basically one of the immiscible phases. Typically, the other phase is a hydrophobic phase that is inimical to water (or any other aqueous phase we use here). Because it is such a tiny value, we typically express it as a logarithmic value.
distribution coefficient = mass sorbed / mass of solid ÷ mass in solution/ volume of solution
distribution coefficient = 2.00g / 3.00g÷ 3.00g /70
= 0.66/ 0.42
=1.57
Therefore, 1.57 is the distribution coefficient.
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Pieces of potassium (Φ = 3.68 × 10–19 J) and sodium (Φ = 4.41 × 10–19 J) metal are exposed to radiation of wavelength 290.0 nm.
What is the velocity of the electrons from sodium?
What is the velocity of the electrons from potassium?
Answer:
Explanation:
The velocity of electrons can be calculated using the equation v = h / (mλ), where h is Planck's constant (6.63 x 10^-34 Js), m is the mass of the electron, and λ is the wavelength of the radiation.
For sodium, the electron energy is given as Φ = 4.41 × 10–19 J. To find the velocity of the electrons, we first need to convert the energy into wavelength using the equation λ = hc / Φ, where c is the speed of light (3 x 10^8 m/s).
So, for sodium:
λ = hc / Φ = 6.63 x 10^-34 x 3 x 10^8 / 4.41 x 10^-19
λ = 290 nm.
And then using the velocity equation,
v = h / (mλ) = 6.63 x 10^-34 / (9.11 x 10^-31 x (290 x 10^-9))
For potassium, the electron energy is given as Φ = 3.68 × 10–19 J, and the wavelength can be calculated in the same way as for sodium:
λ = hc / Φ = 6.63 x 10^-34 x 3 x 10^8 / 3.68 x 10^-19
λ = 290 nm.
And then using the velocity equation,
v = h / (mλ) = 6.63 x 10^-34 / (9.11 x 10^-31 x (290 x 10^-9))
Note: m is the mass of an electron, which is 9.11 x 10^-31 kg.
So, both the velocity of the electrons from sodium and potassium would be the same, given that they are both exposed to the same wavelength radiation of 290 nm.
Answer:The velocity of electrons from sodium and potassium can be calculated using the equation E=hf, where E is the energy of the electron, h is Planck's constant and f is the frequency of the radiation.
From the equation E=hf, f can be calculated using the wavelength of the radiation:
f = c/λ
where c is the speed of light.
Then, using E=hf and the values for E (Φ) for sodium and potassium, the velocity of the electrons can be calculated using the equation:
v = sqrt(2E/m)
where m is the mass of the electron.
Explanation:
The velocity of electrons from sodium and potassium can be calculated using the equation E=hf, where E is the energy of the electron, h is Planck's constant and f is the frequency of the radiation.
From the equation E=hf, f can be calculated using the wavelength of the radiation:
f = c/λ
where c is the speed of light.
Then, using E=hf and the values for E (Φ) for sodium and potassium, the velocity of the electrons can be calculated using the equation:
v = sqrt(2E/m)
where m is the mass of the electron.
How do I balance the equations out
Equations are balanced using the idea of chemical reactions. to ensure that the reactant side and product side are in equilibrium the steps are below
How to balance equationsBalancing chemical equations means making sure that the same number of atoms of each element are present on both sides of the equation. Here are the steps to balance a chemical equation:
Write the unbalanced equation.Assign oxidation numbers to each element in the equation.Identify the element that needs to be balanced first.Add coefficients in front of the chemical formulas to balance the number of atoms of the selected element.Repeat the process for each element in the equation until the equation is balanced.Check the balanced equation to make sure all elements are balanced.It's important to keep in mind that the coefficients should be kept in their lowest whole number ratios, and you can use fractional coefficients if necessary. If the equation is already balanced, no further action needs to be taken.
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After a precipitation reaction with 0.64M H2SO4 was completed, you centrifuge the sample, dry and weigh it. The ppt is found to weigh 0.109 grams. Based on this mass, what was the original concentration of the unknown Pb(NO3)2 solution in mol/L? Answer to 3 sf.
The original concentration of the Pb(NO₃)₂ solution in mol/L would be 0.00036 moles / 0.64 L = 0.0000056 mol/L = 0.056 mM (rounded to 3 significant figures).
We must do a mass-to-moles conversion to ascertain the Pb(NO3)2 solution's initial concentration. The following equation describes the precipitation reaction between Pb(NO₃)₂ and H₂SO₄:
Pb(NO₃)₂ + H₂SO₄ -> PbSO₄ + 2HNO₃
PbSO₄ has a molar mass of 303.2 g/mol.
Therefore, 0.00036 moles of PbSO₄ are equal to 0.109 g of PbSO₄ divided by 303.2 g/mol.
Therefore, 0.00036 moles of PbSO₄ are equal to 0.109 g of PbSO₄ divided by 303.2 g/mol. Since the ratio of Pb(NO₃)₂ to PbSO4 in the reaction is 1:1, we can infer that the initial solution included the same number of moles of Pb(NO₃)₂
Since the ratio of Pb(NO₃)₂ to PbSO₄ in the reaction is 1:1, we can infer that the initial solution included the same number of moles of Pb(NO₃)₂ The Pb(NO₃)₂ solution's initial concentration would therefore be 0.00036 moles / 0.64 L = 0.0000056 mol/L = 0.056 mM. (rounded to 3 significant figures).
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How can you determine if a substance is hydrophobic?
Answer :Hydrophobicity is measured in terms of the contact angle of the water drops to the surface of textiles
Explanation:
Briefly describe what happens during each step of photosynthesis:
Sunlight absorption:
Light-dependent reactions:
Light-independent reactions:
Photosynthesis is the process in which plants use sunlight, water, and carbon dioxide to make oxygen and energy in the form of sugar. During each step of photosynthesis that is Sunlight absorption, Light-dependent reactions, Light-independent reactions explain in below description.
What is photosynthesis ?Sunlight absorption: Special pigments in photosynthetic cells absorb light energy. Plant pigment molecules absorb light with wavelengths ranging from 400 nm to 700 nm. This wavelength range is known as photosynthetically active radiation (PAR).
Light-dependent reactions: Light energy is used in light-dependent reactions to create two molecules required for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. Light reactions occur in the thylakoid membranes of chloroplast organelles in plants.
Light-independent reactions: Photosynthesis's light-independent reactions occur within the stroma. It contains enzymes that, in collaboration with ATP and NADPH, "fix" carbon from carbon dioxide into molecules that can be used to make glucose. The stroma also stores the chloroplast's own genetic material.
Thus, These are the steps of photosynthesis.
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New moon is when the Moon cannot be seen because we are looking at the unit half of the Moon.
The new moon phase occurs when the Moon in directly between the Earth and Sun. A solar eclipse can only happen at new moon.
A waxing crescent moon is when the Moon looks like crescent and the crescent increases ("waxes") in size from one day to the next. This phase is usually only seen in the west.
The first quarter moon (or a half moon) is when half of the lit portion of the Moon is visible after waxing crescent phase. It comes a week after new moon.
A waxing Gibbous moon occurs when more than half of the lit portion of the Moon can be seen and the shape increases ("waxes") in size from one day to the next. The waxing gibbous phase occurs between the first quarter and full moon phases.
A full moon is when we can see the entire lit portion of the Moon.
The total lunar eclipse when the Moon is on the eclipse can only happen at opposite side of the Earth from the Sun, called opposition.
A lunar eclipse can only happen at full moon.
A waxing gibbous moon occurs when more than half of the lit portion of the Moon can be seen and the shape decreases ("waxes") in size from one day to the next. The waning gibbous phase occurs between the full moon and third quarter phases. after th
About Full moonThe full moon generally occurs on the 14th day after the new moon phase. The full moon occurs when the position of the earth is between the moon and the sun in a relatively straight line. The entire sunlit side of the moon becomes visible so that on a full moon, the moon looks completely round and very bright.
During the full moon many parts of the Moon can be seen from Earth, and most of it is the surface form in the form of craters. Because at full moon, some of the craters on the surface of the moon look like there are emission lines coming from the center of the crater.
These lines come from the scattering of particles that were thrown up when meteorites fell to the surface of the moon and formed craters.
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A change in tempo is the only thing that can make a musical cliché more effective.
A. False, a change in dynamics is the only thing that can make a musical cliché more effective.
B. True
C. False, using changes in tempo and dynamics can make a musical cliché more effective.
D. False, a change in tempo cannot make a musical cliché more effective.
False, using changes in tempo and dynamics can make a musical cliché more effective. Hence, option C is correct.
What is musical tempo ?Tempo in a music refers to pace of the music especially in high pitch sound waves. The most common unit of measurement for tempo is beats per minute (BPM), which is just the quantity of beats that may be captured in a minute at a certain pace.
A musical segment or composition is slower when the beats per minute is lower than when the BPM is greater. While a higher BPM is more likely to make the listener feel excited, a lower BPM is more likely to have a calming and/or sad effect on the listener.
Changing dynamics is some more effective way to make musical cliché. Hence, option C is correct.
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