Chemistry Assessment

Which of the following particles is found in the shells of atoms?

• Protons

• Electrons

• Neutrons

• Protons and electrons

The rate of a reaction is calculated by ________.

• multiplying the amount of gas produced by the time taken

• adding the amount of the gas produced to the time taken

• dividing the amount of gas produced by the time taken

• subtracting the amount of gas produced from the time taken

Which of these phenomena describes the haphazard movement of particles of an atom?

• Diffusion

• Osmosis

• Density

• Brownian motion

What is the relative molecular mass of Na₂SiO₃?

[Na = 23, Si = 28, O = 16]

• 98 g/mol

• 142 g/mol

• 122 g/mol

• 108 g/mol

The minimum energy that reactants must have before a chemical reaction can occur is called ________.

• chemical energy

• activation energy

• reaction energy

• all of the above

The heaviest particle in an atom is _________.

• electron

• neutron

• proton

• diatom

A reaction that involves the absorption of energy from the environment is known as _______.

• endothermic reaction

• exothermic reaction

• neutralization reaction

• displacement reaction

The greatest force of cohesion is found in ________.

• liquids

• gases

• solids

• plasma

Which period does the element with the electronic configuration 2, 8, 8, 1 belong to?

• Period 1

• Period 2

• Period 3

• Period 4

A key similarity between liquids and gases is that they both ________.

• spread fast

• have fixed volume

• can be compressed

• take the shape of their containers