Chemical/Physical change
Density
The Atom
Substances
Chemical equations
100
What are the three states of matter?
Solid, liquid and gas.
100

The volume of a lead block is 10 ml. 

What is this in cm3?

10 cm3

100
What are the subatomic particles?
Neutrons, protons, and electrons.
100
A pure substance made of only one type of atom is known as what?
An element.
100

Which of the following is a chemical equation?


A. Hydrogen gas plus oxygen gas yields water.

B. H2 + O2 ---->  H2O

B. H2 + O2 ----> H2O

200
An example of a solid is:

   A. Water

   B. Steam

   C. Ice

Ice
200

What is the density of a block with a volume of 6 cm3 and a mass of 12 g

2 g/cm3

200
Where would you find neutrons and protons in an atom?
In the nucleus.
200
This substance contains two or more atoms of the some type of element.
A molecule
200

Which of the following is a word equation?

A. Hydrogen gas plus oxygen gas yields water.

B. H2 + O2 ----> H2O

A. Hydrogen gas plus oxygen gas yields water.

300
A change that does not produce a new substance is known as what sort of change?
Physical change
300

Which is more dense?


A. A 2 cm3 block of aluminium with a mass of 6 g.

B. A 2 cm3 block of brass with a mass of 10 g.

B. A 2 cm3 block of brass with a mass of 10 g.

300
Where would you find electrons?
In electron shells.
300

This substance contains two or more atoms of different elements.

A compound.
300
What is another name for iron oxide?
Rust
400
A chemical reaction is described as exothermic. What type of change is this?
Chemical change.
400
In less than 10 words, state why icebergs float.
Ice is less dense than water.
400
What are the names of the elements with the symbol C, H and O?
Carbon, Hydrogen and Oxygen.
400
The air that you breath is a:


A. Compound

B. Mixture

C. Molecule

B. Mixture

400

How many hydrogen atoms are there in acetic acid (vinegar) with the chemical formula CH3COOH?

4
500
When a substance is cooled, the atoms __________ .
Contract
500
Define density and state the formula.
The amount of matter (mass) packed into a certain space (volume). 


    d = m / V

500
Define atom
The smallest building block of all matter.
500
The coins that we use everyday are what sort of substance?
An alloy.
500
Write the word equation for the following reaction:

Sally takes some carbon dioxide and adds it to a test tube that contains calcium. A few hours later she observes that some calcium carbonate has formed. 

Carbon dioxide plus calcium yields calcium carbonate.
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