EXTRA CREDIT: 1.2-1.4, 2.3 + Scientific Notation Review

Characteristics that can only be observed or measured when atoms of matter rearrange during a chemical change are___

• chemical properties

• physical properties

• additive property

• distributive property

Characteristics that can be observed or measured without changing the substance are__

• chemical properties

• physical properties

• additive property

• distributive property

Bob mixes a strange powder with a liquid in a beaker. Which of the following would show that a chemical change happened?

• The powder dissolved until none could be seen.

• Some powder was left in the bottom of the beaker.

• Gas came out and the mass went down after it was mixed.

• The leftover powder pulled together to form clumps.

Ms.Nunez is testing the densities of oil and water. She accidentally puts more oil than water on a jar. Will this affect the densities of the two substances?

• Yes, they will no longer separate because she added more.

• Yes, you will only see the oil will go to the bottom now that she put more.

• No, they will still separate from each other regardless of the amount.

• No, you will only see the oil go to the bottom now what she put more.

What is the formula to calculate density?

• Density=mass/volume

• Density=volume/mass

• Density=cm3/g

• Density=mL/g

According to the table, which metal sample has a density less than 8 g/cm3, could produce a blue flame, and is not the best at conducting electricity?

• zinc

• lead

• tin

• iron

Which one is NOT a sign of a chemical reaction?

• precipate formation

• gas production

• temperature change

• crystal dissolving

Where do chemical reactions get their energy from?

• The recombination of the products to make the reactants.

• The recombination of the reactants to make the products.

TRUE/FALSE: The amount of substance affects its physical properties.

• TRUE

• FALSE

TRUE/FALSE: The amount of substance affects how dense something is.

• TRUE

• FALSE