Unit 3 Matter

Name

Period

• 1
• 2
• 3
• 4

In the classification of matter chart, letter A. would be a(n)

• A) acid.
• B) compound.
• C) element.
• D) solution.

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?

• A) Solid melts.
• B) Heat is given off.
• C) Substance dissolves
• D) Substance changes shape.

By now, you know that sound is produced by vibrations. These vibrations can travel through solids, liquids, and gases, but not through ______________.

• A) empty space
• B) granite rock
• C) living objects
• D) the center of the earth

Justin Bleeber is a lazy young man and decides to burn a pile of leaves instead of bagging it. The pile of leaves weighed three pounds before being burned. After the leaves are burned the leftover ash weighs half a pound. What happened to the rest of the mass of the leaves?

• A) It was destroyed.
• B) It soaked into the ground.
• C) It compacted into the ash.
• D) It was turned into smoke and gas.

The law of conservation of mass states that matter cannot be created nor __________________.

• destroyed
• transferred
• changed
• rearranged

It is best to observe the law of conservation of mass in a _____________________ because it will ensure that the mass is the same in the beginning and end of a chemical reaction.

• open
• closed
• rearranged
• balanced

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

• 25 grams
• 30 grams
• 15 grams
• 0 grams

Which of the following defines the atomic number?

• electrons
• protons
• ions
• elements