Review - Law of Conservation of Mass

Front

Law of Conservation of Mass

Back

Mass is never created or destroyed

Front

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?

Back

They both will weigh the same

Front

10 g of a solid chemical reacts with 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?

Back

The gas produced weighed 7 g

Front

12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? Options: 28 g, 4g, 30g, 12g

Back

28 g

Front

In the reaction shown by the equation, 252 grams of FeCl₂ and 70 grams of Cl₂ are consumed.
2FeCl₂ + Cl₂ --> 2FeCl₃
How many grams of FeCl₃ are produced? Options: 161 grams, 182 grams, 322 grams, 392 grams

Back

322 grams

Front

Which equation best represents the law of conservation of mass? Options: A, B, C, D

Back

C

Front

Matter can not be created nor destroyed: it can only be

Back

Transformed, changed

Front

Which chemical equation is balanced? Options: CH₄+O₂------CO₂+2H₂O, H₂+O₂-----2H₂O₄, 4Al+3O₂-----2Al₂O₃

Back

4Al+3O₂-----2Al₂O₃

Front

If a reaction starts with a total 75g of reactants, it should produce:

Back

a total of 75g of products

Front

Is this equation balanced or unbalanced? 2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

Back

balanced