Level 10 Chemistry Pre-Test

Which of the following statements correctly describes the significance of periods in the periodic table?

• Periods indicate the number of valence electrons in an atom.

• Periods indicate the number of electron shells in an atom.

• Periods indicate the atomic mass of elements.

• Periods indicate the reactivity of elements.

Tags

NGSS.HS-PS1-1

Which of the following elements is a non-metal?

• Sodium (Na)

• Magnesium (Mg)

• Chlorine (Cl)

• Aluminium (Al)

What trend is observed in atomic size as you move down a group in the periodic table?

• Atomic size decreases.

• Atomic size remains the same.

• Atomic size increases.

• Atomic size first increases then decreases.

Which of the following reactions is an example of a synthesis reaction?

Tags

NGSS.MS-PS1-1

In an exothermic reaction, what happens to the energy?

• Energy is absorbed from the surroundings.

• Energy is released to the surroundings.

• Energy remains constant.

• Energy is converted into mass.

Tags

NGSS.HS-PS1-4

Which factor does NOT affect the rate of a chemical reaction?

• Temperature

• Concentration

• Surface area of solid reactants

• Colour of reactants

Tags

NGSS.HS-PS1-5

What is the effect of increasing the temperature on the rate of a chemical reaction?

• The rate decreases.

• The rate remains the same.

• The rate increases.

• The rate first decreases then increases.

Tags

NGSS.HS-PS1-5

Which of the following is an example of a displacement reaction?

What is the primary role of a catalyst in a chemical reaction?

• To increase the temperature of the reaction.

• To decrease the concentration of reactants.

• To increase the rate of the reaction.

• To change the products of the reaction.

Tags

NGSS.HS-PS1-5

Which of the following elements has the highest reactivity?

• Helium (He)

• Fluorine (F)

• Neon (Ne)

• Argon (Ar)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2