A sample of calcium bromide contains 0.2 g calcium and 0.8 g bromine by mass. Calculate the empirical formula of calcium bromide.(relative atomic masses: Ca = 40, Br = 80). Show the calculation.

Answer:

C . 24 L

Explanation:

Given data:

Initial volume of gas = 20.0 L

Initial pressure of gas = 660 mmHg

Final volume = ?

Final pressure = 550 mmHg

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

660 mmHg × 20.0 L = 550 mmHg × V₂

V₂ = 13200 mmHg. L/ 550 mmHg

V₂ = 24 L

Answer:

In explanation,

Explanation:

Tests of Big Bang: The CMB. The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background", or CMB.

Answer:

0.36 moles

Explanation:

Given data:

Number of moles of SO₃ form = ?

Number of moles of SO₂ react = 0.36 mol

Solution:

Chemical equation:

2SO₂ + O₂      →      2SO₃

Now we will compare the moles of SO₃ with SO₂.

                       SO₂           :           SO₃

                         2             :            2

                       0.36         :           0.36

Thus, from 0.36 moles of SO₂ 0.36 moles of SO₃ formed.

Answer:

Magnesium (Mg)

Explanation:

An element with a lower atomic mass than Calcium that has similar chemical property is the element Magnesium (Mg).

This because, elements in the same group or family on the periodic table has similar chemical properties.

Magnesium belongs to the same group as Calcium, other elements are:

     Be  Mg  Ca    Sr  Ba  Ra

The group is made of the alkaline earth metals. They have two valence electrons in their outer shell.

Answer:

My guess is b or c but its robably wrong

Explanation:

I just also need points sorry <3

Answer:

1. It is a covalent bond and all covalent bonds have low melting points

Explanation:

Answer:

by eating healthy food and having a balanced diet also by exercising

An athlete might be able to increase their cellular respiration through the consumption of a balanced diet along with a regular exercising pattern.

Cellular respiration may be defined as a process through which organisms break down the molecules of glucose within the cell in order to avail energy in form of ATP for metabolic and cellular processes.

As we all know that glucose molecules and oxygen are the reactants for cellular respiration. So, a better level of glucose can be availed by a healthy and balanced diet and a standard oxygen level can be availed through a regular exercising pattern.

Therefore, an athlete might be able to increase their cellular respiration through the consumption of a balanced diet along with a regular exercising pattern.

To learn more about Cellular respiration, refer to the link:

https://brainly.com/question/2809259

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Effusion refers to the movement of a gas through a small hole. It is different from diffusion which involves the movement of a gas from a region of higher concentration to a region of lower concentration.

The effusion of a gas is described by Graham's law. According to Graham's law, the rate of effusion of a gas is inversely proportional to the square root of the molar mass of the gas.

The following are true regarding the effusion of a gas;

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Answer:

Electroplating is the process that uses electric current to reduce dissolved metal ions by the use of electrolysis, to obtain the dissolved metal ions at the other electrode, mostly in the format of a uniform coating.

Answer:

Explanation:

The volume of the gas at standard pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{635 \times 8}{1} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

please mark as brainliest

Explanation:

ans: Gas

The particles of matter in the gaseous state are neither close together nor fixed in place. The gas expands to fill its container. Thus, a given number of particles will have the greatest volume in the gas state.30‏/06‏/2014

Answer:

2D refers to the term “two-dimensional.”

3D refers to the term “three-dimensional.”

Explanation:

Circle, triangle, square, rectangle, and pentagon are some of the most common examples of 2D shapes.

Cylinder, pyramid, cube, and prism are some of the most common examples of 3D shapes.

Answer:

B) 12

Explanation:

Given parameters:

Initial volume  = 3L

Initial pressure  = 4atm

Final pressure  = 6atm

Unknown:

Final volume  = ?

Solution:

To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

   P₁V₁  = P₂V₂

 P and V are pressure and temperature values

 1 and 2 are initial and final states.

    PV product  = 3 x 4 = 12

The [tex]P \times V[/tex] product of this given sample of gas is equal to: B) 12 atm.

Given the following data:

To determine the [tex]P \times V[/tex] product of this given sample of gas, we would apply Boyle's law:

Boyle's law states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyle's law is given by the formula;

[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]P \times V = 4 \times 3\\\\P \times V = 12\;atm[/tex]

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Answer: D

Explanation:

I don’t have an explanation. I got the answer wrong, I put “Circular electron paths”, when really it’s Electron Clouds.

Answer:D : Electron Clouds

Explanation:

is defined mathematically, describing a region with a high probability of containing electrons

Answer:

66326.8 g Os

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

2.1 × 10²⁶ atoms Os

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Os - 190.2 g/mol

Step 3: Convert

[tex]2.1 \cdot 10^{26} \ atoms \ Os(\frac{1 \ mol \ Os}{6.022 \cdot 10^{23} \ atoms \ Os} )(\frac{190.2 \ g \ Os}{1 \ mol \ Os} )[/tex] = 66326.8 g Os

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

66326.8 g Os ≈ 66000 g Os

Answer:

the equation is balanced bro

Answer:

3.01 × 10²³ atoms

Explanation:

Given data:

Mass of sample of silver = 53.93 g

Number of atoms of silver = ?

Solution:

Number of moles of silver:

Number of moles = mass/ molar mass

Number of moles = 53.93 g/ 107.86 g/mol

Number of moles = 0.5 mol

Number of atoms of silver:

1 mole = 6.022 × 10²³ atoms

0.5 mol × 6.022 × 10²³ atoms /1 mol

3.01 × 10²³ atoms

Answer:

The answer is B.  A river is a body of water, therefore, there will always be some water running over the rock.

Answer:

The answer is: B

Explanation:

The reason for this is because when a rock is underwater (the river, in this case), the water runs across it non-stop until the rock is removed from the water. The only way it can be polished if it is submerged under the water for quite some time (years and years).

I hope this helped! :))

Ionic Bonding (the transfer of valence electrons)

Answer:

Ok:

Explanation:

Sodium gives fluorine an electron. This is in part due to electronegativity differences because sodium likes to lose an electron and fluorine likes to gain. As a result, sodium and become positively charged and fluorine negatively charged. This will for electrostatic attraction and the sodium and fluorine will form a bond. This bond is called an ionic bond.

Answer:

Explanation:This unequal distribution of electrons is known as a polar covalent bond, characterized by a partial positive charge on one atom and a partial negative charge on the other. The atom that attracts the electrons more strongly acquires the partial negative charge and vice versa.

Answer:

covalent bonds............

covalent bonds

Ionic bonds structure when a nonmetal and a steel alternate electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic enchantment between two oppositely charged ions.

Answer:

Isotopes of an element have different physical properties.

Hope I can help you have a nice day.

Answer:

Both the motion of the particles in the substance and the temperature of the substance increase.

Answer The motion of the particles in the substance increases, and the temperature of the substance decreases.  

Explanation:

Answer:

no, because factors can not be divided

Explanation:

Answer:

C

Explanation:

Answer:

NaCl

Explanation:

Because it's sodium chloride

Answer:

approximately 27 days

Explanation: