Answer:
Part A:
First, convert molarity to moles by multiplying by the volume:
0.293 M AgNO3 = (0.293 moles AgNO3)/1 L x 1.19 L = 0.349 moles AgNO3
How many grams are in 5.2 grams of K
Mg2+ and Br- formula
Answer:
MgBr₂
Explanation:
The given ions are:
Mg²⁺ and Br⁻
To find the formula of the compound that will result, we use the combining power or valency approach.
The combining power is the number of electrons usually lost or gained or shared by atoms of elements during the chemical combination.
Mg²⁺ and Br⁻
combining power 2 1
exchange of valencies 1 2
Molecular formula is given as MgBr₂
Repeating many forms a crystal structure inside each of these repeated units is the ?
Answer:
unit cells; lattice
Explanation:
From 1962 until 1981 pennies were made from 95% copper and 5% zinc and had a mass of 3.1 g. Starting in 1982, pennies have been made from 97.5% zinc and 2.5% copper and have a mass of 2.5 g. Suppose you have a sample of pennies that consists of 45.4% pre-1982 pennies. Determine the average mass of a penny in this sample.
Answer:
2.7724 g
Explanation:
Mass of pre- 1892 pennies = 3.1 g
Abundance = 45.4 %
Mass of post 1892 pennies = 2.5 g
Abundance = 100 - 45.4 = 54.6 %
The average mass is given as = ( 3.1 g * 45.4 / 100) + (2.5g * 54.6 / 100)
Average Mass = 3.1 * 0.454 + 2.5 * 0.546
Average Mass = 1.4074 + 1.365 = 2.7724 g
_______________ is a process by which organisms best fit for the environment are most likely tp survive and reproduce
Answer:
natural selection
Explanation:
natural selection
1. An alcohol is oxidized by chromic acid and does not react with Lucas reagent. What class of alcohol is it
Answer:
The alcohol is a primary alcohol.
Explanation:
Chromic acid oxidizes primary alcohols to carboxylic acids and secondary alcohols to ketones but does not react with tertiary alcohols under mild conditions. Therefore, from the Chromic acid test, the class of alcohol is either primary or secondary.
Lucas reagent (a solution of anhydrous ZnCl₂ in conc. HCl)
Primary alcohols do not react readily at room temperature with the Lucas reagent, secondary alcohols react after some minutes while tertiary alcohols react immediately.
Since the alcohol is oxidized by chromic acid and does not react with Lucas reagent, it is a primary alcohol.
A solution of anhydrous zinc chloride in hydrochloric acid is called the Lucas reagent. The alcohol that does not react with Lucas's reagent is a primary alcohol.
What is primary alcohol?The primary alcohol is the compounds that have their hydroxy group (-OH) attached to the primary carbon atom. Its molecular formula is, [tex]\rm CH_{2}OH[/tex].
The hydroxyl carbon of the primary alcohol contains only one R group in its structure. Methanol and ethanol are examples of primary alcohol.
Primary alcohol does not react with Lucas's reagent and no turbidity is formed as carbocation of the primary alcohol is too unstable.
Therefore, primary alcohol does not react with Lucas reagent.
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A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?
Answer:
10 m/s
Explanation:
100 meters covered in 10 seconds, so:
100 m / 10 s = 10 m/s
The total number of molecules in 34.0 grams of NH3 is equal to
A)
2.00 ~ 6.02 x 1023
B)
1.00 6.02 x 1023
C)
1.00 x 22.4
D)
2.00 ~ 22.4
Answer:
A
Explanation:
Sana makatulong tong answer ko
The total number of molecules in 34.0 g of ammonia is equal to 12.044×10[tex]^23[/tex] molecules according to the concept of Avogadro's number.
What is Avogadro's number?
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.
In the given example,number of molecules is determined as follows,
17 g ammonia has 6.022×10²³ molecules
So,34 g ammonia has, 34×6.022×10²³/17=12.044×10²³ molecules.
Hence, the total number of molecules in 34 g of ammonia is 12.044×10²³ molecules.
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Your question is incomplete, but the most probable answer is 12.044×10²³ molecules.
How many atoms of Na would be in 2.53 moles of Na
Answer:
15.24× 10²³ atoms
Explanation:
Given data:
Number of atoms of sodium = ?
Number of moles = 2.53 mol
Solution:
The given problem will solve by using Avogadro number.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.53 mol × 6.022 × 10²³ atoms / 1mol
15.24× 10²³ atoms
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
According to the graph, which statement is correct?
Answer:
There is no graph
Explanation:
10. A mountain bike's
suspension works on a
series of springs. What
is the energy stored in
the spring when the
bike goes over a bump
causing a compression
of 2cm. The spring
constant is 33N/m.
Answer:
The energy stored in the spring when the bike goes over a bump is [tex]6.6\times 10^{-3}[/tex] joules.
Explanation:
Let suppose that spring has a linear behavious, by means of Hooke's Law, definition of Work and Work-Energy Theorem we find that the potential energy stored in the spring ([tex]U_{g}[/tex]), measured in joules, is defined by:
[tex]U_{e} = \frac{1}{2}\cdot k\cdot x^{2}[/tex] (1)
Where:
[tex]k[/tex] - Spring constant, measured in newtons per meter.
[tex]x[/tex] - Deformation, measured in meters.
If we know that [tex]k = 33\,\frac{N}{m}[/tex] and [tex]x = 0.02\,m[/tex], the energy stored by the spring due to compression is:
[tex]U_{e} = \frac{1}{2}\cdot \left(33\,\frac{N}{m} \right) \cdot (0.02\,m)^{2}[/tex]
[tex]U_{e} = 6.6\times 10^{-3}\,J[/tex]
The energy stored in the spring when the bike goes over a bump is [tex]6.6\times 10^{-3}[/tex] joules.
What is the male portion of a zygote referred to.
egg cell
sperm cell
Answer:
sperm cell
Explanation:
The male portion of a zygote is called the sperm cell. The sperm cell are produced by the male organism and they fertilize the eggs.
The female portion of the zygote is called the egg cell. During fertilization, the male sperm cell and the female egg cells unites. The unity forms a zygote. This zygote continues to develop into a viable offspringWhy is a terminal alkyne favored when sodium amide (NaNH2) is used in an elimination reaction with 2,3-dichlorohexane
The question is incomplete, the complete question is;
Why is a terminal alkyne favored when sodium amide (NaNH2) is used in an elimination reaction with 2,3-dichlorohexane? product. A) The terminal alkyne is more stable than the internal alkyne and is naturally the favored B) The terminal alkyne is not favored in this reaction. C) The resonance favors the formation of the terminal rather than internal alkyne. D) The strong base deprotonates the terminal alkyne and removes it from the equilibrium.
E) The positions of the Cl atoms induce the net formation of the terminal alkyne.
Answer:
E) The positions of the Cl atoms induce the net formation of the terminal alkyne.
Explanation:
In this reaction, sterric hindrance plays a very important role. We know that sodamide is a strong base, it tends to attack at the most accessible position.
The first deprotonation yields an alkene. The strong base attacks at the terminal position again and yields the terminal alkyne. Thus the structure of the dihalide makes the terminal hydrogen atoms most accessible to the base. Hence the answer.
Which of the following chemical equations proves that the law of conservation of mass is in effect?
Question 2 options:
Mg2 + LiBr ---> LiMg + Br
2KCl + F2 ---> 2KF + Cl2
Na +O2 ---> Na2O
H20 ---> H2 + O2
Answer:
2KCl + F₂ → 2KF + Cl₂
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
2KCl + F₂ → 2KF + Cl₂
In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.
All other options are incorrect because mass is not conserved.
How many hydrogen atoms are there in total in the following formula?"
Answer:
12
Explanation:
The answer is 12 because You are looking for hydrogen which is the big H. you look to the number below it and it is 12. So H stands for hydrogen and there are 12 Hydrogen getting you your answer of 12.
List the four forms of acid deposition.
Explanation:
rain, snow, cloud, fog or dry deposition - Dry particles, or gas
Which set of reagents will best convert 2,2-dimethylpropan-1-ol (neopentyl alcohol) to 4,4-dimethylpentan-2-ol
Answer:
SOCl2, Mg, CH3CHO, H3O^+
Explanation:
The reaction of the 2,2-dimethylpropan-1-ol with SOCl2 converts the alcohol to an alkyl halide. This now reacts with Mg metal to yield a Grignard reagent.
The Grignard reagent reacts with CH3CHO and acid to yield 4,4-dimethylpentan-2-ol as shown in the image attached to this answer.
How many electron shells/orbitals will be around the nucleus of an atom of aluminum?
A. 1
B. 2
C. 3
4. 4
The number of electrons is revealed by the atomic number. This indicates that an aluminum atom contains 13 electrons. Eight electrons make up shell 1, eight electrons make up shell 2, and three electrons make up shell 3. The correct option is C.
Each subsequent shell that surrounds the nucleus of an atom's electrons is placed farther away from the nucleus. Atomic orbitals make up one or more of the one or more subshells that make up an electron shell.
The first two electrons in aluminum fall into the 1s orbital, followed by the next two electrons into the 2s orbital. The following six electrons complete the second shell's 2p orbital. The 3s orbital is then filled by electrons 11 and 12. The 3p orbital is now occupied by the final electron.
Thus the correct option is C.
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What is the name of the compound with formula P3O10?
Answer:
The compound of the formula is Sodium triphosphate.
Explanation:
An object has a density of 7.8 g/cm3 and a volume of 9 cm? What is the mass of the object?
Answer:
70.2 grams
Explanation:
The formula for density is p = m/V.
Here, p (density) and V (volume) are already given.
So, modify the formula to: m = pV.
p is 7.8 g/cm³, and V is 9 cm³.
m = 39/5 * 9/1
m = 351/5
m = 70.2 grams
The mass of the object is 70.2 grams.
Determine the mass of ammonium nitrate (in g) that has the same number of nitrogen atoms as 2.2 liters of liquid nitrogen (N2). Density of liquid nitrogen is 0.808 g/mL.
Answer:
The mass of ammonium nitrate that has the same number of nitrogen atoms is 5077.5 g.
Explanation:
To calculate the mass of ammonium nitrate we need to find the number of atoms in liquid nitrogen, as follows:
[tex]d_{N} = \frac{m_{N}}{V}[/tex]
Where:
[tex]d_{N}[/tex]: is the density of liquid nitrogen = 0.808 g/mL
[tex]m_{N}[/tex]: is the mass of liquid nitrogen
V: is the volume of liquid nitrogen = 2.2 L
By calculating the mass of liquid nitrogen we can find the number of atoms:
[tex]m_{N}=d_{N}*V = 0.808 g/mL*\frac{1000 mL}{1 L}*2.2 L=1777.6 g[/tex]
[tex]n = N_{A}*\eta_{N}[/tex]
[tex]n=N_{A}*\frac{m_{N}}{M_{N}}[/tex]
Where:
[tex]N_{A}[/tex]: is the Avogadro's number = 6.022x10²³ atoms/mol
n: is the number of atoms of liquid nitrogen
[tex]\eta_{N}[/tex]: is the number of moles of liquid nitrogen
[tex]M_{N}[/tex]: is the molar mass of liquid nitrogen = 28.014 g/mol
[tex]n = \frac{6.022 \cdot 10^{23} atoms}{1 mol}*\frac{1777.6 g}{28.014 g/mol} = 3.82 \cdot 10^{25} atoms[/tex]
Finally, the mass of ammonium nitrate is:
[tex]m_{NH_{4}NO_{3}} = \frac{n*M_{NH_{4}NO_{3}}}{N_{A}}[/tex]
Where:
[tex]M_{NH_{4}NO_{3}}[/tex]: is the molar mass of ammonium nitrate = 80.043 g/mol
[tex] m_{NH_{4}NO_{3}} = \frac{3.82 \cdot 10^{25} atoms*80.043 g/mol}{6.022 \cdot 10^{23} atoms/mol} = 5077.5 g [/tex]
Hence, the mass of ammonium nitrate that has the same number of nitrogen atoms is 5077.5 g.
I hope it helps you!
How does temperature affect pressure?
As temperature increases so does pressure.
Pressure is not affected by temperature.
Pressure will always increase if temperature increases or decreases.
As temperature increases, pressure decrease.
Answer:
fr
Explanation:
Calculate the number of moles of iron that are contained in 2.89x10^ 25 atoms of iron
(Please explain the answer. Thank you!)
A chemist needs 2.00 g of a liquid compound, which has a density of 0.718 g/mL. If the
compound costs $5.67 per mL, how much will a 2.00 gram sample cost?
Sample cost = $15.796
Further explanationGiven
Mass = 2 g
Density = 0.718 g/ml
Cost = $5.67 per mL
Required
Cost
Solution
The density : the ratio of mass and volume
Can be formulated :
Density (ρ) = m : V
The volume of the liquid :
V = m : ρ
V = 2 g : 0.718 g/ml
V = 2.786 ml
Sample cost :
= 2.786 ml x $5.67/ml
= $15.796
What is the mass of 2.53x10^34 atoms of Ni?
Answer:
2.48 g
Explanation:
From the question given above, the following data were obtained:
Number of atoms = 2.53×10³⁴ atoms
Mass of Ni =?
From Avogadro's hypothesis,
we understood that 1 mole of any substance contains 6.02×10²³ atoms.
Therefore, 1 mole of Ni contains 6.02×10²³ atoms.
Recall:
1 mole Ni = 59 g
Therefore, 59 g of Ni contains 6.02×10²³ atoms.
Finally, we shall determine the mass of 2.53×10³⁴ atoms of Ni. This can be obtained as follow:
6.02×10²³ atoms = 59 g
Therefore,
2.53×10³⁴ = 2.53×10³⁴ × 59 / 6.02×10²³
2.53×10³⁴ atoms = 2.48 g
Thus, the mass of 2.53×10³⁴ atoms of Ni is 2.48 g.
3. Why do you think the image of the pencil inside the beaker of water is different than the pencil
inside the empty beaker?
I’m going to give brainlest to who answers does tree questions
Answer:
the water.
Explanation:
well the water makes things look larger than due to ( the surface of a water drop curves outwards to make a dome. this outward or convex, curature light rays inward. the result is an enlarge ment image on the eye. / makes it look larger) + more mass.
Of the following two gases,
which would you predict to
diffuse more rapidly?
СО
CO2
CO diffuses more rapidly as compared to CO₂.
What is Diffusion?Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. The process of diffusion happens more rapidly in gases and liquids as compared to solids because their particles can move randomly.
The gases spread in the entire space available to them and intermix together even against gravity.
The Graham's law of diffusion states that the rates of diffusion of the gases are inversely proportional to the square root of their molar masses under same temperature and pressure.
Therefore, CO diffuses more rapidly as compared to CO₂.
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Which is the atomic number of an atom with six valence electrons?
A)8
B)10
C)12
Answer:
c. 12
Explanation:
Oxygen has six valance electrons
Silicon has six valance electrons
There are a number of possible atomic numbers but all come from the VI A group of elements.
so i think that is your answer base on the statement given above hope that helps thanx
Determine the mass in grams of 5.49 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.)
Answer:
0.67 g
Explanation:
We know that 1 mole of an element is 6.02 x 10^(23) atoms
Now, arsenic has 5.49 × 10²¹ atoms
Thus;
Number of moles of arsenic = 5.49 × 10²¹ × 1/6.02 x 10^(23) = 9 × 10^(-3) moles
We are told that;
one mole of arsenic = 74.92 g.
Thus, 9 × 10^(-3) moles = 9 × 10^(-3) × 74.92/1 = 0.67428 g ≈ 0.67 g
Which two types of organisms are found in the domain Eukarya?
A Protists
B. Archaea
O C. Animals
D. Bacteria
Answer:
A. Protists
C. Animals
Explanation:
Eukarya are protists, plants, animals, and fungi. Hope it helped!
The correct answers are A and C.
Eukarya are one of the three domains in which current biological science divides life. Eukarya are all organisms in which each cell contains a nucleus.
Eukarya, in addition to many unicellular species, include all types of multicellular organisms. Multicellular organisms are made up of different, specific cell types that make up different tissues.
The largest group of organisms within eukarya are the protists. These are all single-celled organisms with a eukaryotic cell structure. The protists show a great diversity of species and, except for having a cell nucleus, show little similarity or relationship with each other. In addition, all multicellular organisms such as plants, animals and fungi are eukaryotes.
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