A substance with a mass of 10 g is heated to produce two new substances. The mass of the first new substance is 9.3 g and the mass of the second new substance is 0.7 g.

Which of the following is best demonstrated by this example?

A student makes a ball-and-stick model of a propane molecule, as shown below. The black balls represent carbon atoms, and the white balls represent hydrogen atoms.

Based on the model, what is the

chemical formula of propane?

Which of the following statements describes what most likely occurs when thermal energy is removed from a liquid?

The table shows the masses and volumes of four cubes made of different materials.

Cube 1: Mass 8 g, volume 1 cm³

Cube 2: Mass 1, volume 8

Cube 3: Mass 1, volume 1

Cube 4, Mass 8, volume 8

Which cube has the greatest density?

Sucrose (C₁₂H₂₂O₁₁) is also known as table sugar. What is the smallest unit of sugar that maintains the chemical characteristics of sugar?

A manufacturer is considering four different metals for making a pot cooking on a stove. The table shows the thermal conductivity and melting points of each metal. A higher value for thermal conductivity means the material conducts more thermal energy.

Which metals should the manufacturer use for the bottom and for the handle of the pan?

A student is conducting an investigation. The table shows results from three samples. Which samples show evidence of chemical change? (Choose ALL that apply.)

Inn this investigation, an exothermic reaction occurred. What is the BEST evidence of an exothermic reaction?

Rust is produced when iron reacts with oxygen. The table shows some characteristics of a sample of iron an a sample of rust.

Identify THREE (place a check on each choice) characteristics that support a claim that iron and rust are different substances.