iGCSE Chemistry Unit 1 (a) - (c)

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

What is the mass number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

A substance that dissolves in a liquid is called the...

• Solvent

• Solute

• Solution

• Salient

Molecules are closest together in a 

• Solid
• Liquid
• Gas

Tags

NGSS.MS-PS1-4

What is diffusion?

• when molecules move

• when molecules move from a high concentration to a low concentration

• no movement

• molecules move everywhere

Most of the mass in an atom is concentrated in the...

• electrons
• nucleus
• protons
• empty space

Tags

NGSS.HS-PS1-8

What does the nucleus consist of?

• Protons + Electrons
• Neutrons + Electrons
• Atoms
• Protons + Neutrons

Tags

NGSS.MS-PS1-1

Isotopes are the atoms of the same element with the same number of.............. but different number of............

• electrons/neutrons

• neutrons/protons

• protons/neutrons

• electrons/protons

Tags

NGSS.MS-PS1-1

Elements contain only one type of atoms.

• True

• False

Tags

NGSS.MS-PS1-1