AJack794152 chemical change revision quiz 1

In the reactivity series which of the following is the most reactive element?

• Copper

• Zinc

• Calcium

• Potassium

Dissolving salt in water is an example of a _____.

• physical change
• chemical change

Is burning wood a chemical or physical change?

• chemical
• physical

Which of the following is the best definition of a strong acid?

• An acid that fully dissociates into its ions.

• An acid the partially dissociates into its ions.

• An acid that does not dissociate into ions.

Hydrogen and oxygen react to form water.  How much water would form if 4.8 grams of hydrogen reacts with 38.4 grams of oxygen?

• 33.6 grams of water
• 184.3 grams of water
• 43.2 grams of water
• 8.0 grams of water

Which of the following is the best definition for a weak acid?

• An acid that fully dissociates into its ions.

• An acid that partially dissociates into its ions.

• An acid that does not dissociate into its ions.

Is making a cake physical or chemical

• physical
• chemical
• ducktile
• maluable

In the diagram, which electrode is the anode?

• Left

• Right

How many atoms in all are in a molecule of serotonin?

C₁₀H₁₂N₂O

• 22
• 24
• 25
• 4

In a chemical change, how does the mass of the reactants compare to the mass of the products?

• The mass of the products is always greater than the mass of the reactants.
• The mass of the reactants is always greater than the mass of the products.
• The mass of the reactants is always equal to the mass of the products.
• It depends on the specific chemical change.