Chemistry Quiz #1

Question 1

What are Atoms?

Answer 1

basic particle of matter

Question 2

What are molecules?

Answer 2

Two or more atoms are chemically joined to make a unique particle of matter

Question 3

What is an element?

Answer 3

• A pure substance that cannot be broken down into simpler substances.
• made up of only one kind of atom.

Question 4

What is a compound?

Answer 4

• a pure substance that can be broken down chemically into simpler substances.
• is made up of molecules which must be composed of two or more atoms.

Question 5

What are examples of compounds? And why?

Answer 5

• water because it is made up of more than one atom.

Propane because it is made up of more than one atom.

Question 6

What are examples of elements? And why?

Answer 6

• oxygen because it is made up of only one type of atom

- copper because it cannot be chemically broken down into simpler substances.

Question 7

What is a mixture?

Answer 7

• two or more elements or compounds that are not chemically combined.

Question 8

How may types of mixtures are their? What are their names?

Answer 8

There are two types of mixtures.

• homogeneous (uniform solution) looks like one substance.
• heterogenous (mechanical mixture)
  Looks like more than one substance/ can see different types of particles.

Question 9

What are examples of a homogenous mixture? And why?

Answer 9

• air because it looks like one substance.

- salt water because it looks like only one substance.

Question 10

What is the particle theory of matter?

Answer 10

1. All matter is made up of particles.
2. Different substance are made up of different types of particles.
3. Particles are in constant motion.
4. Particles move faster and father apart when heated.
5. Particles are attracted to each other.

Question 11

What is a chemical change?

Answer 11

• a change that occurs when a substance changes composition by forming one or more new substances.

Question 12

What is a physical change?

Answer 12

A change of matter form one form to another without a change in the chemical properties.

Question 13

What are signs that a chemical change has occurred?

Answer 13

• colour change
• fizzing or foaming
• production of heat or light

Question 14

What are signs that a physical change has occurred?

Answer 14

• a change in smell

Question 15

What are some examples of chemical change? And why?

Answer 15

• a tree burns to form ashes because a new substance is formed.
• a piece of apple rots on the ground because their is a change of colour.

Question 16

What are some examples of a physical change?

Answer 16

• glass breaking because the substance is still glass.

- a piece of metal is bent in half because it so still the same substance.

Question 17

What is a Qualitative property?

Answer 17

• descriptive quality’s about an object ( with no mug we sir measurements being used).

Question 18

What is a quantitative property?

Answer 18

• describing a temperature, length, width, etc.

Question 19

What is an example of a qualitative property?

Answer 19

• pretty
• rough texture
• blue

Question 20

What is an example of a quantitive property?

Answer 20

• melts at 97 degrees
• the desk is 2 metres long
• the rooms area is 333