Physical & Chemical Changes

Vocabulary

100

T/F: An endothermic reaction releases energy and a exothermic reaction takes energy in

what is false?

200

A measurement of how much matter is contained in a certain volume of a substance.

density

300

Type of change where a new substance is created.

What is a CHEMICAL CHANGE?

400

a change in the physical form or properties of a substance that occurs without a change in composition.

What is a PHYSICAL CHANGE?

500

Photosynthesis and Cellular Respiration are two examples of chemical reactions.  Which of the two is exothermic and which of the two in endothermic?

Photosynthesis is endothermic and cellular respiration is exothermic

Physical and Chemical Properties

100

What property explains why we use foam cups  to hold hot drinks?

ability to conduct heat

200

List one chemical property

flammability/ reactivity

300

The density if water at room temperature is

1.00 g/mL

400

Write all three density formulas

d =m/v

m = dv

v = m/d

500

What is the mass of a 450 cubic centimeter block of silicon if the density of silicon is 2.336 grams/cubic centimeter?

1051.2 grams

Intensive or Extensive

100

These properties are NOT affected by the size of the sample (or amount of matter present)

Intensive properties

200

These properties depend upon the sample size

What is extensive properties?

300

What type of property is density

intensive

400

What type of property is mass

extensive

500

What type of property is melting point

intensive

Physical and Chemical Changes

100

Is rust an example of a chemical change?

What is YES? You cannot change rust back into the metal is was before; therefore, it is a chemical change.

200

Name the four indicators of a chemical change.

What are color change, bubbles, temperature change, precipitate?

300

T/F: Water boiling is a physical change

true

400

True or False. Turning peanuts to peanut butter is an chemical change.

What is FALSE? To make peanut butter, you grind up roasted peanuts, so nothing new is being created.

500

Is a melted popsicle an example of a physical change?

What is YES? You can melt and refreeze a popsicle and it will still be a popsicle.

Reactions

100

Ability of a substance to combine chemically with another substance.

What is reactivity?

200

What is the ability of a substance to react  in the presence of oxygen and burn when exposed to a flame.

What is flammability?

300

 the substances that undergo a chemical change

what is reactants?

400

the substance formed as a result of the chemical change

what is products

500

Write the cellular respiration and photosynthesis reactions

Photosynthesis

6CO2   + 6H2O  + sunlight ==> C6H12O6 + 6O2

Cellular Respiration

C6H12O6 + 6 O2 ==> 6 H2O+ 6 CO2+ energy