CSCJ Physical and Chemical Properties, Changes, Variables & Density

Vocabulary

100

These are the characteristics of an object and you use your senses to identify them.

 physical property

200

Anything that has mass and takes up space.

matter

300

These are the four states of matter.

Solid, liquid, gas, and plasma.

400

Type of change where a new substance is created.

Chemical property

500

The measure of how acidic or basic a substance is.

pH

Chemical Properties and Changes

100

Name a food that is an example of a chemical change and explain why.

 A cake, because you cannot turn a cake back into the eggs, flour, sugar, etc. that you mixed together.

200

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

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

300

This occurs when silver reacts with sulfur in the air, producing a grayish-brown film.

Tarnish

400

Metal reacts with oxygen and water producing this substance.

rust

500

List four chemical properties

Flammability, reacts with oxygen, reacts with light, reacts with water, tarnish

Physical Properties and Changes

100

Measures how hot or cold something is:

temperature

200

This term refers to the shiny appearance of some metals or the ability to reflect light.

luster

300

The ability to be hammered or rolled into thin sheets.

malleability

400

Mass divided by volume

density

500

The ability to be drawn into wires.

ductility

Chemical or Physical Change

100

Frying an egg is a physical or chemical change

chemical change

200

An ice cube melting.

physical change

300

Mowing the lawn

A physical change

400

An apple turning brown

A chemical change

500

Scrambling eggs

chemical change

Variables,Density & Atoms

100

How many atoms of each are in the following compound: 

CaCO₃

1 CALCIUM

1 CARBON

3 OXYGEN

____________

5 atoms in total

200

How many atoms of each ? CH₃COOH

2 CARBON

4 HYDROGEN

2 OXYGEN

__________

8 atoms in total

300

An object has the following measurement 3 m long , 5 m wide and 6 meter tall, also it has a mass of 500 kg, calculate the density. Remember to give the correct units. 

Volume= 3m x 5m x 6 m = 90 m³

Density = 500 kg / 90 m³ = 5.55 kg/m³

400

Identify which one is an element. compound and mixture: 

ZnSO₄ 

Na

Chocolate Chip Cookie

Compound

Element

Mixture

500

Identify the Independent Variable, De3penedent Variable and Controlled Variable in the following exercise: 

A scientist will investigate if the fertilizer will increase the rate of grass growth. He will observe the grass for 2 weeks and will add daily 3 ml of water and will expose the grass to sunlight in the morning from 7:00 to 10:00 a.m.

Independent Variable: fertilizer

Dependent Variable: grass growth

Controlled Variable: 2 weeks, time in the sunlight, amount of water