**Answer:**

**Explanation:**

In this problem, we have the equation of a chemical reaction to complete.

The uncomplete equation is:

In order to complete the equation, the missing compound must include the missing elements, which are:

So the missing compound must be

So now we can write:

However, the reaction is not balanced yet, in fact we see that:

- We have 2 atoms of Rb on the left, and 1 atom only on the right

So we add a 2 in front of RbF:

However, now the F is not balanced, so we also add a 2 in front of LiF:

Finally, we see now that the Li is not balanced, therefore:

So now the equation is balanced.

<h3>

**Answer:**</h3>

544.34 mL

<h3>

**Explanation:**</h3>

- Combined gas law is a law that combines both Boyle's law and Charles's law.
- According to the combined gas law the volume of a fixed mas of a gas is directly proportional to absolute temperature but inversely proportional to pressure.

That is;** **

in our case we are given;

Initial volume, V1 = 1025 mL

Initial temperature, T1 = 75 °C (But K = °C + 273.5)

= 348.5 K

Initial pressure, P1 = 0.75 atm

New temperature, T2 = 308.15 K (35°C +273.15)

New pressure , P2 = 1.25 atm

We are required to calculate the new volume, V2

Replacing the known variables in the equation of combined gas law we can find the new volume;

** **

** **

Therefore, the new volume is 544.34 mL

**Answer: 63**

**Explanation: (3.78/6.022)*100**

It gives off a certain colour because when the spectrum is combined........I'm not sure if that's write but i think it is.....not 100% sure tho

Answer is: **heterogeneous mixtures.**

1) Heterogeneous mixture is not uniform in composition.

For example, sand and small pebbles, proportions of its components (in this mixture particles of different colors and size) vary throughout the sample.

2) Homogeneous mixture (solution if it is liquid) has the same proporties of its components throughout any given sample.

For example, if we have mixture of water and alcohol ethanol, we can separate water and ethanol with distillation (process of heating and cooling). Ethanol and water have different boiling points (physical property).

3) Pure substance is made of only one type of atom or only one type of molecule, it has definite and constant composition with distinct chemical properties.