When solid potassium chlorate is heated, it decomposes to form solid potassium chloride and oxygen gas. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

Describe three changes in physical properties you might observe when two liquids solutions are mixed and a chemical change takes place

We are doing an experiment on measuring the temperature. We are to measure the temperature of hot water (measure it initially, then wait for 10 minutes then measure again). Additionally, we are to measure the temperature of another water before and after putting ice (measure initially then measure 3 times [every 5 minutes] for 15 minutes). My question are: What law or principles of chemistry could be applied in this experiment? Should we expect the temperature of the hot water to drop? why? Should we expect the temperature of the water to rise or drop after putting the ice? why?

Balance the chemical equation H2(g)+N2(g)→NH3(g) Express your answer as a chemical equation. Identify all of the phases in your answer

At certain pressures, ClF forms a solid that sublimes when heated. Using a few words  and a simple diagram, explain what is happening when ClF sublimes upon heating. Be  sure your answer describes the differences in the two states of matter.

Balance each chemical equation. Al(s)+S(l)→Al2S3(s) Express your answer as a chemical equation. Identify all of the phases in your answer.

Magnesium will burn in air to form both Mg3N2 and MgO. What mass of each product would be found if burning a 3.29 g sample of magnesium to completion produces a combined total of 5.09 g of the two products?