Grade 6 Quiz Challenge

Marroquin and Miranda are having a science experiment day! They want to know which of the following is an example of a physical change. Can you help them figure it out?

• Burning wood

• Melting ice

• Rusting iron

• Baking a cake

Answer explanation

Melting ice is a physical change because it involves a change in state from solid to liquid without altering the chemical composition. In contrast, burning wood, rusting iron, and baking a cake involve chemical changes.

During a science experiment, Sophie, Miranda, and Ivan are exploring different materials. Which property do they discover is shared by all metals?

• They are brittle

• They are good conductors of electricity

• They are gases at room temperature

• They are colorless

Answer explanation

All metals are good conductors of electricity due to the presence of free-moving electrons. This property distinguishes them from non-metals, which may be brittle, gaseous, or colorless.

Miranda, Dylan, and Melany are doing science experiments in class. Which of the following activities shows a chemical change happening in their experiment?

• Dissolving sugar in water

• Freezing water

• Burning paper

• Breaking glass

Answer explanation

Burning paper is a chemical change because it transforms the paper into ash and gases, altering its chemical composition. In contrast, dissolving sugar, freezing water, and breaking glass are physical changes.

• 54

• 56

• 58

• 64

Answer explanation

To find the value of 7 times 8, simply multiply: 7 × 8 = 56. Therefore, the correct answer is 56.

Dylan, Melany, and Alex are playing a number game. They need to find out which number is a prime number to win the game. Can you help them choose the correct number?

• 9

• 15

• 17

• 21

Answer explanation

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. Among the choices, 17 is prime, as it can only be divided by 1 and 17, while 9, 15, and 21 have other divisors.

Answer explanation

The area of a rectangle is calculated by multiplying the length by the width. Here, the length is 5 units and the width is 3 units. Thus, the area = 5 * 3 = 15 square units, which is the correct answer.

Jacqueline and Dylan are working on a science project about energy sources. Which of the following is a renewable resource that they can use for their project?

• Coal

• Oil

• Solar energy

• Natural gas

Answer explanation

Solar energy is a renewable resource because it is derived from the sun, which is constantly replenished. In contrast, coal, oil, and natural gas are fossil fuels that take millions of years to form and are not renewable.

Answer explanation

To add \(\frac{1}{2}\) and \(\frac{1}{4}\), find a common denominator, which is 4. Convert \(\frac{1}{2}\) to \(\frac{2}{4}\). Now, \(\frac{2}{4} + \frac{1}{4} = \frac{3}{4}\). Thus, the correct answer is \(\frac{3}{4}\).

Melany, Dylan, and Sophie are learning about the human body in science class. Which of the following is a super important job of the skeletal system?

• Producing hormones

• Pumping blood

• Providing support and structure

• Digesting food

Answer explanation

The skeletal system provides support and structure to the body, allowing for movement and protecting vital organs. The other options, such as producing hormones, pumping blood, and digesting food, are functions of other systems.

• 18

• 27

• 81

• 72

Answer explanation

The value of 9 squared, written as 9^2, is calculated by multiplying 9 by itself: 9 x 9 = 81. Therefore, the correct answer is 81.