8 Science Review

Methane (CH₄) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). CH₄ + 2O₂ → CO₂ + 2H₂O Which of the following is true about this reaction?

• The mass of methane used equals the mass of carbon dioxide produced.

• The total mass of reactants equals the total mass of products.

• The mass of oxygen used equals the mass of water produced.

• The reaction creates more mass in the form of gas.

Tags

NGSS.MS-PS1-5

Sulfuric acid (H₂SO₄) reacts with sodium hydroxide (NaOH) to form water (H₂O) and sodium sulfate (Na₂SO₄). Calculate the mass of water produced.

• 17 g

• 34 g

• 63 g

• 94 g

Tags

NGSS.MS-PS1-5

Sulfuric acid (H₂SO₄) reacts with sodium hydroxide (NaOH) to form water (H₂O) and sodium sulfate (Na₂SO₄).

What is the cause-and-effect relationship in this reaction?

• The reaction occurs because water is produced, causing sulfuric acid to form.

• The presence of sodium sulfate causes sulfuric acid and sodium hydroxide to disappear.

• Sulfuric acid and sodium hydroxide react, causing the production of water and sodium sulfate.

• Water forms first, which then causes the formation of sodium sulfate.

Tags

NGSS.MS-PS1-2

Taleah conducts a chemical reaction and wants to know the number of hydrogen atoms in the products. Hydrogen only appears in the compound 2H₂O in the reactants. How many hydrogen atoms must be in the products?

• There must be 8 hydrogen atoms in the products, because mass increases from reactants to products.

• There must be 4 hydrogen atoms in the products, because the total mass is conserved.

• There must be 2 hydrogen atoms in the products, because the total mass is conserved.

• There must be 6 hydrogen atoms in the products, because mass decreases from reactants to products.

Tags

NGSS.MS-PS1-5

Two pitchers on a baseball team are practicing their fastball. The first pitcher uses a force of 4 N to throw the ball. The second pitcher throws a ball that reaches an acceleration of 42 m/s². The ball has a mass of 0.14 kg. What is the acceleration of the first pitch?

• 20 m/s²
• 35 m/s²
• 28.57 m/s²
• 50 m/s²

Tags

NGSS.MS-PS2-2

Two pitchers on a baseball team are practicing their fastball. The first pitcher uses a force of 4 N to throw the ball. The second pitcher throws a ball that reaches an acceleration of 42 m/s². The ball has a mass of 0.14 kg. First, calculate the acceleration of the first pitched ball. Which statement about the two pitches is true?

• The acceleration of the first pithed ball is 28.6 m/s2. The second pitch was thrown with a greater amount of force than the first pitch.

• The first pitch was thrown with a greater amount of force than the second pitch.

• The first pitch and second pitch were thrown with the same amount of force.

• The second pitch was thrown with a lesser amount of force than the first pitch.

  The acceleration of the first pithed ball is 28.6

Tags

NGSS.MS-PS2-2

Carts of different masses are pulled along a flat surface. The table shows some variables for each cart. What are the steps to calculate the acceleration of cart 1?

• Divide frictional force by the mass.

  1.0 m/s²

• Add the applied force and frictional force, then divide by the mass.

  3.5 m/s²

• Divide the applied force by the mass.

  4.0 m/s²

• Subtract the Applied force and frictional force, then divide by the mass.

  2.5 m/s²

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Carts of different masses are pulled along a flat surface. The table shows some variables for each cart. What is the acceleration of car 2?

• 1 m/s²
• 3 m/s²
• 2 m/s²
• 0.5 m/s²

Tags

NGSS.MS-PS2-2

Carts of different masses are pulled along a flat surface. The table shows some variables for each cart. What is the acceleration of car 4?

• 3 m/s²
• 2 m/s²
• 0.5 m/s²
• 1 m/s²

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Carts of different masses are pulled along a flat surface. The table shows some variables for each cart. What is the acceleration of car 1?

• 1.0 m/s²
• 3.5 m/s²
• 2.5 m/s²
• 4.0 m/s²

Tags

NGSS.MS-PS2-2