Problem Solving with Four Operations and Rational Numbers

Which of the following operations is used to calculate the density of a substance?

• Addition

• Subtraction

• Multiplication

• Division

If a solution has a pH of 3, what is its hydrogen ion concentration compared to a solution with a pH of 6?

• 1000 times higher

• 100 times higher

• 10 times higher

• Equal

A scientist measures the mass of a sample as 50 grams and its volume as 25 cm³. What is the density of the sample?

• 1 g/cm³

• 2 g/cm³

• 0.5 g/cm³

• 5 g/cm³

Which operation would you use to find the average speed of an object?

• Addition

• Subtraction

• Multiplication

• Division

In a chemical reaction, the mass of the reactants is 100 grams and the mass of the products is 95 grams. What is the mass of the gas released?

• 5 grams

• 10 grams

• 15 grams

• 20 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A car travels 150 km in 3 hours. What is its average speed?

• 30 km/h

• 50 km/h

• 60 km/h

• 70 km/h

Which of the following is a rational number?

If a scientist wants to dilute a solution to half its concentration, which operation should they use?

• Addition

• Subtraction

• Multiplication

• Division

A researcher needs to calculate the force exerted by an object with a mass of 10 kg and an acceleration of 5 m/s². Which formula should they use?

What is the result of dividing the charge of an electron by the charge of a proton?

• 1

• -1

• 0

• 2