Science Unit 1 Quiz

James and Lily found a mysterious object in their backyard. How can they determine if it's made of pure Copper?

• By the solubility of the object.

• See if the object reacts with another object.

• Compare the mass of the copper object to the mass of a piece of pure Copper.

• Calculate the density of the object and compare it to the known density of pure Copper.

Answer explanation

To determine if an object is pure copper, calculating its density and comparing it to the known density of pure copper is effective. This method provides a clear and quantitative way to assess purity.

In a thrilling science showdown, Nora and Ethan are comparing 20 grams of two mysterious materials, A and B, on a laboratory balance. Both Solid Cube A and Solid Cube B weigh 30g each. Can you help them figure out what makes material B different from material A?

• Density

• Mass

• Phase

• Shape

Answer explanation

Material A and B have the same mass (30g each) and are in solid phase, but they differ in density. Density is defined as mass per unit volume, which can vary between different materials even if their mass is the same.

Imagine Benjamin and Sophia are on a space adventure to Mercury! What would happen to the mass and weight of their spaceship on Mercury?

• No change between Mass and Weight.

• The weight would decrease, and the mass would stay the same.

• The mass would increase, and the weight would stay the same.

• The weight would increase, and the mass would stay the same.

Answer explanation

On Mercury, the gravitational pull is weaker than on Earth, so the weight of an object would decrease. However, mass, which is the amount of matter in an object, remains unchanged regardless of location.

Imagine you're on a space adventure with Charlotte, Harper, and Nora. In which state of matter will the molecules be spaced the farthest apart?

• Solid

• Liquid

• Gas

Answer explanation

In gases, molecules are spaced farthest apart due to high kinetic energy, allowing them to move freely and occupy more space. In solids and liquids, molecules are closer together due to stronger intermolecular forces.

During a lively science class, Anika and Maya are debating: What is a cool similarity that both gases and liquids share?

• They have a definite shape.

• They can flow.

• They are compressible.

• They have a fixed volume.

Answer explanation

Both gases and liquids can flow, allowing them to take the shape of their containers. This is a key similarity, while they differ in shape, compressibility, and volume.

Hey there, science explorers! Can you help Sophia and Oliver figure out why solids like their favorite toys have a definite shape and volume?

• Shapes stay the same in any container.

• Shapes change when they are in different containers.

• Volumes stay the same in any container.

• Volumes change when they are in different containers.

Answer explanation

Solids have a definite shape and volume because their particles are closely packed and fixed in place. Therefore, shapes stay the same in any container, unlike liquids or gases that adapt to the shape of their containers.

Mason and Aria are having a fun science experiment! They want to know which material will spread out to completely fill a larger container. Can you help them figure it out?

• Air

• Rocks

• Sand

• Coke

Answer explanation

Air is a gas that expands to fill any available space in a container, unlike rocks and sand, which maintain their shape and volume. Coke, being a liquid, can also fill a container but does not expand like air.

Emma and Mia are having a friendly debate about solubility. Which of the following substances do you think would win the 'Most Soluble' award?

• 40 g of sand

• 40 g of oil

• 40 g of soil

• 40 g of sugar

Answer explanation

Sugar is highly soluble in water due to its polar nature, allowing it to dissolve easily. In contrast, sand, oil, and soil have low solubility in water, making sugar the substance with the greatest solubility.

Hey there, curious minds! Can you help Aria and Daniel figure out which properties remain unchanged no matter how big or small the sample size is?

• Mean

• Standard Deviation

• Variance

• Median

Answer explanation

The median is a measure of central tendency that remains unchanged regardless of sample size, as it depends only on the order of values. In contrast, mean, standard deviation, and variance are influenced by the number of observations.

Imagine you're in a science class with Henry, Priya, and Rohan. The teacher asks, "Which physical property do all metals share that makes them so useful in everyday life?"

• They are all magnetic.

• They all have the same melting points.

• They all have thermal and electrical conductivity.

Answer explanation

All metals share the property of thermal and electrical conductivity, allowing them to efficiently conduct heat and electricity. This is a fundamental characteristic of metals, unlike magnetism or melting points which vary.