8th Grade MidTerm Review

Front

Which balanced equation represents a reaction that involves 6 atoms of nitrogen? Options: N₂ +3H₂ →2NH₃, 4NH₃ +3O₂ →2N₂ +6H₂O, 3N₂ +2O₂ →2N₃O₂, 2NO+O₂ →2NO₂

Back

3N₂ +2O₂ →2N₃O₂

Front

How many different elements are in the compound sodium bicarbonate (NaHCO₃)?

Back

4

Front

In the chemical reaction shown below, all of the HCl and Zn will react to form H₂ and ZnCl₂. Which of the following statements describes the result of this reaction? Options: The hydrogen gas will have a mass of zero, The zinc chloride will have less mass than the zinc, The mass of the products will equal the mass of the reactants, The mass of the hydrogen atoms will decrease in the products

Back

The mass of the products will equal the mass of the reactants

Front

The balanced equation below represents the reaction of NaOH with H₃PO₄. When 20 grams of NaOH reacts with 49 grams of H₃PO₄, 9 grams of water (H₂O) is produced. How many grams of NaH₂PO₄ are produced?

Back

60 grams

Front

Which of the following is a characteristic of ALL chemical changes? A different state of matter is produced., A new material is formed., Some mass is converted to energy., Some form of light is given off

Back

A new material is formed.

Front

A girl skiing down a mountain is increasing her speed while skiing downhill. Which statements accurately describe the potential and kinetic energy of this skier?

Back

Kinetic energy increases. Potential energy decreases.

Front

In a distance-time graph, a horizontal line indicates that the object −

Back

Is at rest

Front

Which diagram correctly illustrates an unbalanced force being applied to an object? Options: A, B, C, D

Back

C

Front

Which of Newton’s Laws relates to the action of the rider on horse number two?

Back

An object in motion continues in the same direction and speed.

Front

The balanced equation below represents the reaction of NaOH with H₃PO₄. When 30 grams of NaOH reacts with 48 grams of H₃PO₄, how many grams of water (H₂O) are produced?

Back

69 grams