Polytechnic Chemistry 2

Question 1

What is an exothermic reaction?

Accepted Answer

A reaction that releases heat to the surroundings

Answer

A reaction that absorbs heat from the surroundings

Answer

A reaction that produces light

Answer

A reaction that requires high temperature

Question 2

What is the molecular formula of water?

Accepted Answer

H₂O

Answer

HO₂

Answer

H₂O₂

Answer

HO

Question 3

What does the periodic table organize elements by?

Accepted Answer

Increasing atomic number

Answer

Increasing atomic mass only

Answer

Alphabetical order

Answer

Decreasing electronegativity

Question 4

What type of reaction is: A + BC → AC + B?

Accepted Answer

Single displacement (substitution) reaction

Answer

Double displacement reaction

Answer

Synthesis reaction

Answer

Decomposition reaction

Question 5

What is a mole in chemistry?

Accepted Answer

A unit representing 6.022 × 10²³ particles

Answer

A unit of mass equal to one gram

Answer

A unit of concentration

Answer

A unit of molecular weight

Question 6

What is oxidation in a redox reaction?

Accepted Answer

Loss of electrons

Answer

Gain of electrons

Answer

Gain of protons

Answer

Loss of protons