Chemistry Quiz

Li+ is a cation which is

• negative charged atom

• positive charged atom

• atom with extra neutrons

• type of molecule

In a chemical reaction, what is conserved?

• The number of molecules

• The total mass of the reactants and products

• The volume of the substances involved

• The temperature of the reaction

What happens to atoms during a chemical reaction?

• They are created or destroyed

• They change into different elements

• They are rearranged to form new substances

• They remain completely unchanged

In the reaction 2H₂ + O₂ → 2H₂O what does the arrow represent?

• The direction of energy flow

• The conversion of reactants to products

• The speed of the reaction

• The change in temperature

Which particle is found in the nucleus of an atom?

• Electron

• Proton

• Neutron

• Both proton and neutron

What happens to the mass number of an atom if it gains a neutron?

• It increases by 1

• It decreases by 1

Which of the following represents a balanced chemical equation?

• H₂ + O₂ → H₂O

• 2H₂ + O₂ → 2H₂O

• H₂ + 2O₂ → H₂O₂

• H₂ + 2O₂ → H₂O

What is the charge of a neutral atom?

• Positive

• Negative

• Zero

• It varies depending on the element

Al₂O₃ → Al + O₂, what type of reaction is this?

• Synthesis

• Decomposition

• Single displacement

• Double displacement

An atom with an positive or negative charge?

• ion

• electron

• isotope