Review of Law of Conservation of Mass

Front

Does the experimental data of 48.6g Magnesium + 32.0g Oxygen ------> 80.6g Magnesium Oxide support the Law of Conservation of Mass?

Back

yes

Front

12.2 g Magnesium + 8.0 g Oxygen ------> _____Magnesium Oxide. Predict the mass of magnesium oxide produced.

Back

20.2 g

Front

If the cap had been removed during the reaction (open system), would there still be 44g of Product in the jar?

Back

No, some of the substance was lost out of the container as a gas

Front

A scientist mixed 100 grams of salt into 500 grams of water. How many grams of salt water did I make?

Back

600g

Front

A student heated a 10 gram sample of a compound in an open container. A chemical reaction occurred. The mass of the sample was measured again and found to be less than before. Which of the following explains the change in mass of the sample?

Back

One of the reaction products was a gas.

Front

Which of the following is a physical change?

• rusting metal
• boiling water
• leaves changing color
• bubbling of an antacid tablet in water

Back

boiling water

Front

What type of reaction absorbs thermal energy?

Back

endothermic

Front

If you heat a substance in a test tube and it starts as green and after heating is black, you have observed a ____________

Back

Chemical change

Front

Is the equation balanced?

Back

yes

Front

Is the equation balanced?

Back

no