genchem quiz 2

1. Law of conservation of mass states that

• matter is created

• matter is destroyed

• matter is neither created nor destroyed

• matter does not change

2. What is the law of conservation of mass?

• The amount of matter changes when reacted or changed.

• The mass of all reactants is changed during a physical or chemical change

• The mass of the reactants equals the mass of the products

• The mass of the products is different than the mass of the reactants.

Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

• His chemical reaction defied the law of conservation of mass

• The product destroyed mass during the reaction

• The reactants created matter during the reaction

• The gas that was produced was not able to be weighed since the container was open.

4. If a reaction starts with 20g of reactants it should produce

• a total of 40g of product.

• a total of 10g of product

• a total of 80g of product

• a total of 20g of product

5. 10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be concluded?

• 5g of gas was produced

• This experiment violates the conservation of mass

• 7g of gas was produced

• The excess reactant is destroyed & disappears during the reaction

6. REACTANTS are always on what side of the chemical equation?

• Right side
• Left side

• Below the equation
• Above the equation

7. What property in exhibited when a metal is hammered into a thin sheer?

• Malleability

• Elasticity

• Ductility

• Brittleness

8. Which of the following is a physical property?

• Flammability

• Density

• Reaction to acid

• Explosiveness

9. Which of the following is chemical property?

• Solubility

• Boiling point

• Corrosiveness

• Texture

10. What is the characteristic or trait of matter that is dependent on the amount quantity?

• Intensive Physical Property

• Extensive Physical Property

• Chemical Property

• Physical Property