Answer:
CN
CH
C9H20
P205
BH3
Explanation:
A student holds their pen 20 centimeters above the desk. If the pen has a mass of 3
grams, how much potential energy does the pen have? (gravity is 9.8 m/s2)
SHOW YOUR WORK.
The potential energy : PE = 5.88 x 10⁻³ J
Further explanationGiven
height = h = 20 cm = 0.2 m
mass = 3 grams = 3 x 10⁻³ kg
Required
The potential energy
Solution
The energy produced from its position is called potential energy (PE)
which can be formulated as:
PE = m. g. h
Input the value :
PE = 3 x 10⁻³ x 9.8 x 0.2
PE = 5.88 x 10⁻³ J
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.7 nm.93.7 nm. What is the final state of the hydrogen atom? Values for physical constants can be found in the Chempendix.
Answer:
5
Explanation:
Given that the formula is;
1/λ= R(1/nf^2 - 1/ni^2)
λ = 93.7 nm or 93.7 * 10^-9 m
R= 1.097 * 10^7 m-1
nf = ?
ni = 1
From;
ΔE = hc/λ
ΔE = 6.63 * 10^-34 * 3* 10^8/93.7 * 10^-9
ΔE = 21 * 10^-19 J
ΔE = -2.18 * 10^-18 J (1/nf^2 - 1/ni^2)
21 * 10^-19 J = -2.18 * 10^-18 J (1/nf^2 - 1/ni^2)
21 * 10^-19/-2.18 * 10^-18 = (1/nf^2 - 1/1^2)
-0.963 = (1/nf^2 - 1)
-0.963 + 1 = 1/nf^2
0.037 = 1/nf^2
nf^2 = (0.037)^-1
nf^2 = 27
nf = 5
atoms are composed of subtomatic particles called
What is the percent composition of Mg in the compound Mg3(PO4)2?
A 21.92%
B 23.57%
C 32.32%
D 27.74%
Answer:
D 27.74%
Explanation:
Percent composition of Magnesium (Mg) in Magnesium Phosphate compound ie Mg3(PO4)2 = 27.74%
Answer:
The answer is D
Explanation:
I took the test
How many elements are in k2HPO4
Which of the following intermolecular forces is the strongest?
A. Hydrogen bonding
B. Van der Waals forces
C. Dipole-dipole attractions
D. Induced dipole attractions
SUBMIT
Answer:
A. Hydrogen Bonding
Explanation:
Answer:
Hydrogen bonding
Explanation:
because it has the highest electronegative force
Calculate the molarity of a solution containing 0.875moles of glucose in 1.5kg of water.
molarity = moles of solute/liters of solution
We know the moles of solute: 0.875 moles of glucose. We can easily determine the liters of solution by using the mass of water given (1.5 kg) and the density of water (approximately 1 kg/L): they're, for all intents and purposes, equal (the approximation isn't large enough to be appreciable here, nor would the volume of the solution appreciably change since the solute is a solid that will dissolve into the solvent). So, we have 1.5 L of solution.
Now, we plug in what we have:
molarity = 0.875 moles of glucose/1.5 L of solution = 0.58 M glucose
The answer is provided to two significant figures since we're given the mass of water to two significant figures.
The rate constant (k) for a reaction was measured as a function of temperature. A plot of ln k versus 1>T (in K) is linear and has a slope of -1.01 * 104 K. Calculate the activation energy for the reaction.
Answer:
8.397J/mol is the activation energy for the reaction
Explanation:
The graphical form of Arrhenius equation is:
ln k = -Ea/R*(1/T)+lnA
Where k is activation energy
Ea is activation energy
R is gas constant (8.314J/molK)
T is absolute temperature
And A is the pre-exponential factor.
The slope of the plot is -Ea/R:
-Ea/R = -1.01x10⁴K
-Ea/8.314J/molK = -1.01x10⁴K
Ea = -1.01x10⁴K*8.314J/molK
Ea = 8.397J/mol is the activation energy for the reaction
The compound dioxane, which is used as a solvent in various industrial processes, is composed of C, H, and O atoms. Combustion of a 2.203-g sample of this compound produces 4.401 g CO2 and 1.802 g H2O. A separate experiment shows that it has a molar mass of 88.1 g/mol. What is the correct molecular formula for dioxane?
Answer:
[tex]C_4H_8O_2[/tex]
Explanation:
Hello!
In this case, since the combustion of this compound has only one source of carbon, the carbon dioxide, we can compute both mass and moles of carbon in 4.401 grams of CO2:
[tex]n_C = 4.401gCO_2*\frac{1molCO_2}{44.01gCO_2}* \frac{1molC}{1molCO_2} =0.1molC\\\\m_C = 0.1molC*\frac{12.01gC}{1molC} = 1.201gC[/tex]
Next, we do the same for hydrogen in water, as the only source of this atom in the products:
[tex]n_H = 1.802gH_2O*\frac{1molH_2O}{18.02gH_2O}* \frac{2molH}{1molH_2O} =0.2molH\\\\m_H = 0.2molC*\frac{1.01gH}{1molH} = 0.202gH[/tex]
Thus, we compute the mass and then the moles of oxygen considering the 2.203-g sample of dioxane:
[tex]m_O = 2.203g-m_C-m_H=2.203g-1.202g-0.202g = 0.799gO\\\\n_O =0.799gO*\frac{1molO}{16.0gO} =0.05molO[/tex]
Next, we divide the moles of C, H and O by the moles of O as the fewest in the molecule to find their subscripts in the empirical formula:
[tex]C:\frac{0.1mol}{0.050mol}=2 \\\\H:\frac{0.202mol}{0.050mol} =4\\\\O:\frac{0.050}{0.050}=1 \\\\[/tex]
[tex]C_2H_4O[/tex]
Whose molar mass is 44.1 g/mol. Thus, since the molar mass of the compound is 88.1 g/mol, we see a factor of 2 by which the empirical formula should be multiplied to get the molecular one, therefore, we obtain:
[tex]C_4H_8O_2[/tex]
Best regards!
Given the setup of the equilibrium constant expression, a reaction that has a high equilibrium constant will "favor" the products
True
False
Answer:
for points
Explanation:
loll
Which of the following compounds is formed by a covalent bond?
a. C6H12O6 b. NaBr c. CaCI2 d. NaCI
Answer: C6H12O6 is formed by a covalent bond, the rest of the options are formed by ionic bonds.
A chemist prepares a solution of calcium bromide by measuring out of calcium bromide into a volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.
Answer:
6.76 mol/L
Explanation:
A chemist prepares a solution 0.607 kg of calcium bromide by measuring out of calcium bromide into a 450. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.
Step 1: Given data
Mass of calcium bromide (solute): 0.607 kg (607 g)Volume of solution (V): 450. mLStep 2: Calculate the moles of solute
The molar mass of calcium bromide is 199.89 g/mol.
607 g × 1 mol/199.89 g = 3.04 mol
Step 3: Convert "V" to liters
We will use the conversion factor 1 L = 1000 mL.
450. mL × 1 L/1000 mL = 0.450 L
Step 4: Calculate the concentration of calcium bromide in mol/L
[CaBr₂] = 3.04 mol/0.450 L = 6.76 mol/L
How many grams is 6.11 moles of MgCO3?
Answer:
the answer is 262.216229
Explanation:
:)
Answer:
84.3139 grams.
Explanation:
Practice: Balance each of the chemical equations below. (Some equations may already be in balance.) In the space to the right, classify the reaction as a synthesis, decomposition, single replacement, or double replacement reaction. A. AgNO3 + KCl ???? AgCl + KNO3 B. H2O + SO3 ???? H2SO4 C. KI + Cl2 ???? KCl + I2 D. NaHCO3 ???? Na2CO3 + H2O + CO2 E. Zn + HCl ???? ZnCl2 + H2 F. BaCl2 + Na2SO4 ???? BaSO4 + NaCl G. C3H8 + O2 ???? CO2 + H2O H. Al + CuCl2 ???? AlCl3 + Cu
Explanation:
A. AgNO3 + KCl --> AgCl + KNO3
Reaction is already balanced.
Type = Double Replacement
B. H2O + SO3 --> H2SO4
Reaction is already balanced.
Type = Synthesis
C. KI + Cl2 --> KCl + I2
Balanced Equation = 2KI + Cl2 --> 2KCl + I2
Type = Single Replacement
D. NaHCO3 --> Na2CO3 + H2O + CO2
Balanced Equation = 2NaHCO3 --> Na2CO3 + H2O + CO2
Type = Decomposition
E. Zn + HCl --> ZnCl2 + H2
Balanced Equation = Zn + 2HCl --> ZnCl2 + H2
Type = Single Replacement
F. BaCl2 + Na2SO4 --> BaSO4 + NaCl
Balanced Equation = BaCl2 + Na2SO4 → 2NaCl + BaSO4
Type = Double Replacement
G. C3H8 + O2 --> CO2 + H2O
Balanced Equation = C3H8 + 5O2 → 3CO2 + 4H2O
Type = Single Replacement
H. Al + CuCl2 --> AlCl3 + Cu
Balanced Equation = 2Al + 3CuCl2 → 2AlCl3 + 3Cu
Type = Single Replacement
100 POINTS!!!!
Sydney made the largest s'more when camping with 70g of marshmallows, 50g of graham cracker and 100g of chocolate. To find the percent composition of the chocolate, which equation would she use?
Question 1 options:
100g/120g*100
100g/220g*100
220g/100g*100
120g/100g*100
100g/220g*100 is the correct answer- I took the test
Answer:
answer:
given;
total gram=70+50+100=220g
total gram of chocolate=100g
percentage composition of chocolate=total gram of chocolate/total gram ×100%
=100g/220g ×100 is your answer
how likely is it that a brother or sister would be just like you.
Answer:
Theoretically you could be totally unrelated to your sister or share the exact same DNA as your brother. But because we are talking about so much DNA and so many different possible combinations, the percentage usually comes out to about 50%. Think about it like flipping a coin.
Explanation:
Explanation:
Theoretically you could be totally unrelated to your sister or share the exact same DNA as your brother. But because we are talking about so much DNA and so many different possible combinations, the percentage usually comes out to about 50%.
Determine what happens in this reaction.S + Cl2 →SCl2
Sulfur act as a reducing agent and chlorine acts as an oxidizing agent.
Oxidation: The loss of electronsReduction: The gain of electronsOxidation number:The charge is based on the number of electrons assigned to an atom as compared to the neutral atom
Given reaction:-
[tex]S+Cl_2 \rightarrow SCl_2[/tex]
The oxidation state of sulfur in the left side is 0, but in right side is +2. So, sulfur is oxidized. The oxidation number of Cl in the reactant side is 0 and n the product side is -1. So, Cl acts as oxidizing agent.
To know more about:-
brainly.com/question/13182308
In 7 seconds, how far will a ball roll at a speed of 4 meters/second?
Answer:
28 meters
Explanation:
Human induced phenomena that cause global
warming
(Need at least 3)
Answer:
Burning of fossil fuels
Cutting of tress
Also CO2 is produce in industries like cement manufacturing.
Explanation:
Why did the Ahmet family have to leave their home? A- They could no longer afford to live there. B-They were asked to leave by the government. C-Their home was destroyed by a bomb. D-Violence broke out in the village that they lived in.
Answer:
c). their home was destroyed by the government
Explanation:
yan po ang Tama sure ako sa sagot ko.
What type of reaction is _CaCO3 and H2
Decomposition: A substance breaks down to smaller species.
A strong acid is used as a titrant against a weak base. What would be the most likely pH for the equilibrium point?
Answer:
Below 7
Explanation:
The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of reactants have been mixed(Wikipedia).
For a strong acid-weak base titration, the pH at the equivalence point is usually below 7. This owes to the fact that a conjugate acid is produced in the course of the reaction which interacts with water to produce hydronium (H3O+) ions.
Answer:
7
Explanation:
i did my research and from what i found its 7.
Which best describes an element?
a pure substance
a type of a mixture
a pure compound
an impure substance
Answer:
A.) pure substance
Explanation:
edge 2021
Which natural resource is limited in supply?
)
A)
wind
B)
petroleum
C)
water power
D)
solar energy
you
12. Choose one famous MLK quote as
Favorite and explain why that is your
favorite?
1. How many moles are in 230. Grams of SO2?
2. How many molecules are in 30.5 moles of lithium nitrate?
3.59 mol
1.836 x 10 ²⁵ molecules
Further explanationGiven
230 g SO2
30.5 moles LiNO3
Required
moles and molecules
Solution
mol = mass : molar mass
1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)
1. 230 g x 1 mol/64,066 g =3.59 mol
2. 30.5 moles x 6.02 x 10 ²³ molecules / 1 mol = 1.836 x 10 ²⁵ molecules
A 8.919 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.65 grams of CO2 and 7.768 grams of H2O are produced. In a separate experiment, the molar mass is found to be 62.07 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
Answer:
Empirical formula = CH₃O
Molecular formula = C₂H₆O₂
Explanation:
The empirical formula is the simplest whole-number ratio of atoms present in a molecule. To find the ratio of atoms we must find the moles of C, H and O. With the molar mass we can find the molecular formula:
Moles C = Moles CO₂:
12.65g * (1mol / 44.01g) = 0.2874 moles of C * 12.01g/mol = 3.452g C
Moles H = 1/2 moles H₂O:
7.768g * (1mol / 18.015g) = 0.4312 moles of H₂O * 2 = 0.8624 moles H * 1.008g/mol = 0.869g H
Moles O:
Mass O = 8.919g - 0.869g H - 3.452g C = 4.598g O * (1mol / 16g) = 0.2874 moles of O
Ratio of atoms -Dividing in the lower number of moles-:
C = 0.2874 mol C / 0.2874 mol = 1
H = 0.8624 mol H / 0.2874 mol = 3
O = 0.2874 mol O / 0.2874 mol = 1
Empirical formula = CH₃OThe molar mass of this formula is:
1C = 12.01g/mol
3H = 3*1.008g/mol = 3.024g/mol
1O = 16g/mol
12.01+3.024+16 = 31.034g/mol
Twice this formula gives the molecular formula = 31.034g/mol*2 = 62.068g/mol ≅ the molar mass of the compound. That means molecular formula of the compound is:
C₂H₆O₂Nitrates are _____.
compounds made from carbon dioxide
used by plants to make protein
released into the atmosphere by respiration
are harmful to the environment
Answer:
used by plants to make protein
Explanation:
so B
Which organism would most likely belong to the plant kingdom?
Answer:
tree
Explanation:
so easy and obvious
Decide whether the element is a metal or nonmetal, if you can.
Element is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. But the LED stays dark
Answer:
The element is a nonmetal
Explanation:
Elements are broadly classified into metals and non metals. Metals conduct electricity while non metals do not conduct electricity.
If we look at this scenario described in the question, we can easily decipher that the element is a nonmetal because the LED stays dark. The LED should have been lit if electricity was passed through the element in question.
Hence, the element is a non metal.