Science Concepts and Principles

Front

How do we define mass and volume?

Back

The mass is how heavy something is, and volume is how much space it takes up.

Front

What is the difference between accuracy and precision?

Back

Accuracy measures how close the size is measured to its exact size. Precision is how often your measurements are right, even if they’re not correct.

Front

What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm³? Would it float in water?

Back

Density = mass ÷ volume → 25.0 g ÷ 29.4 cm³ ≈ 0.85 g/cm³. Since this is less than water’s density (1.0 g/cm³), the wood will float.

Front

Use the kinetic molecular theory of matter to describe the movement of particles.

Back

This is a theory that says that all matter is made of tiny particles that are always moving. They get warmer and they go faster depending on hot they get.

Front

How are temperature and heat related?

Back

The temperature measures how fast particles are moving. The heat is the energy that moves from being warmer to becoming cooler.

Front

How would matter be different if atoms had no electrons?

Back

Atoms must have electrons to make chemical bonds, so without electrons nothing would be alive.

Front

Why is mass conserved in a chemical reaction, even when gases are produced?

Back

Atoms don’t go away. They aren’t created or destroyed; they just move around. Even if a gas forms, the masses are still there though it could escape if there is a way to get out.

Front

How would you measure the volume of an object in space, where liquids float?

Back

A mathematical formulas would work, like for a cube or sphere. You could also use a 3D scanner.

Front

Why do some objects with greater mass float while others with less mass sink?

Back

The density is what makes something float. It’s not just mass.

Front

How would the buoyancy of an object change if it were placed in saltwater vs. fresh water?

Back

Salt water is denser, so it gives more buoyant force which makes objects float better in salt water.