Physical Final

Which choice describes the Law of Conservation of Matter BEST?

• a process by which atoms of one or more substances are rearranged
• mass is never created nor destroyed
• the amount of time it takes for half of a sample to break down
• the measure of kinetic and potential energy

TRUE or FALSE: Most of the atoms that are present at the start of a chemical reaction are present at the end.

• True
• False

What is a chemical reaction?

• the amount of time it takes for half of a sample to break down
• how we measure how acidic a solution is
• a process by which atoms of one or more substances are rearranged
• the length of the path

Which of the following are signs of a reaction?

• bubbles
• color change
• light being produced
• sample being broken down into smaller pieces
• ice

Which of the following is NOT a property of an acid?

• Sour taste
• Does not conduct electricity
• pH is lower than 7
• Turns red with blue litmus paper

When an object gets cold, what happens to the particles?

• The particles start to slow down.
• The particles start to speed up.

When an object gets hotter, what happens to the particles?

• The particles start to slow down.
• The particles start to speed up.

What is force?

• The Force Will Guide Me.
• a push or pull
• the law
• rate of acceleration

Pushing an object across a hardwood floor is easier than a carpet because you have to overcome more what on a carpet?

• weight
• gravity
• friction
• rotation

_______________ is the amount of time it takes for half of a sample of a radioisotope to break down.

• Half-life
• Specific heat
• mediums