Chemical Reactions Quiz

What happens when some of the mass of a substance formed bubbles during a chemical reaction?

• absorbed into each other

• escapes as a gas

• nothing

• stays the same

Which given set is correct when incorporating symbols in presenting chemical equations?

• (aq), dissolved in water

• (g), grams

• (L), liter

• (t), temperature

What reactant is needed in the combustion reactions producing water and carbon dioxide?

• carbon

• hydrogen

• nitrogen

• oxygen

How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?

• H-1, S-2, O-8

• H-2, S-1, O-4

• H-2, S-4, O-4

• H-6, S-4, O-

Which statement explains the Law of Conservation of Matter?

• In a chemical reaction, matter can only be created.

• In a chemical reaction, matter can only be destroyed.

• Matter can neither be created nor destroyed in a chemical reaction.

• Matter can either be created or destroyed in a chemical reaction.

In the given chemical reaction, what will be the correct count for the atoms of the reactants? CH4(g) + 2O2(g) → CO2(g) + 2H2O(l),

• 1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms

• 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

• 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms

• 4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms

What will be the products when the given reaction is balanced? C3H8(g) + 5O2(g),?

• 2CO2(g) + 3H2O(l)

• 3CO(g) + 4H2O(l)

• 3CO2(g) + 4H2O(l)

• 4CO2(g) + 3H2O(l)

A given chemical equation provides the necessary information on what is happening during chemical reaction. What does an arrow symbol pointing downward ( ) mean if this is seen in the equation?

• A gas was produced.

• A precipitate was formed.

• The container became hot.

• The substance was dissolved in water.

How will the reaction be written when solid phosphorus is combined with oxygen gas to form diphosphorus pentoxide?

• P(s) + O2 (g) →PO2(g)

• P(s) + O(g) → P2O5(g)

• P(s) + O2 (g) → P2O5(g)

• P2O5 → P2 (s) + O2(g)

A chemical reaction is possible when two or more substances interact under favorable conditions. Which of the following is observed when baking soda is added to vinegar?

• change in temperature.

• formation of a gas.

• change in color.

• Both A and B