year 9 Science Homework Week 7 - Naomi Arthur | Biblioteka

1

In which state of matter are the particles in a regular arrangement?

solids

liquids

gases

1

Which two states of matter cannot be compressed?

Solids and gas

Liquids and solids

Gases and liquids

1

What will cause particles to gain more energy?

Increase in temperature

Decrease in temperature

No change in temperature

1

What is a molecule?

Two or more atoms are chemically joined

One atom chemically joined

Two or more elements chemically joined

1

How many oxygen atoms are there in O3?

1

2

3

1

What is a compound?

two or more atoms chemically joined together

two or more different elements chemically joined together

Two or more molecules chemically joined together

1

What is a pure substance?

A substance that consists of a mixture of elements

A substance that consists of a mixture of atoms

A substance that consists of only one element or compound

1

Who’s model described an atom as a solid sphere?

rutherford

thompson

dalton

1

What was discovered that led Thompson to change the atomic model?

Positive Protons

Neutral neutrons

Negative electrons

1

What does the plum-pudding model show?

Positively-charged protons embedded in a sphere of negative charge

Negatively-charged electrons embedded in a sphere of positive charge

Negatively-charged neutrons embedded in a sphere of positive charge

1

If the plum-pudding model was accurate what would have happened in the alpha-particle scattering experiment?

All the alpha particles should have passed directly through the gold foil

All the alpha particles should have been deflected

All the alpha particles should have been reflected straight backwards

1

What is the relative mass of protons and neutrons?

1

0

-1

1

What is the relative charge of electrons?

+1

0

-1

1

What is the relative charge of protons?

+1

0

-1

1

How many protons does oxygen have?

8

16

24