Which objects could be combined to make a device that would produce electricity?

Charity was measuring a sample of copper to determine its density. The sample had a mass of 27 grams and a volume of 3 cubic centimeters.What is the density of copper?

Which animal species are most likely to survive in a marine environment that has very cold water temperatures?

Which of these represents a chemical change?

What are carbon, hydrogen, and oxygen?

Which sentence describes a way that Earth's biodiversity helps human health?

Carrie tests the stream behind her house each year to find out if the water quality has changed. This year, the water in the stream had a pH of 6.0 according to the pH meter. What describes the pH of the water in the stream?

Hernando ran an electric current through a beaker of distilled water and separated the water into the gases H2 and O2. What type of change did he produce?

On the periodic table, chromium has the symbol Cr, an atomic number of 24, and a mass number of 52. How many protons does chromium have?

Which of the following does not represent a mixture?

Which of the following would not be used to construct an electromagnet?

In what state of matter are the molecules far apart and constantly moving at high speeds?

The planets in our solar system stay in their orbits because of the __________.

The chemical reaction below describes the combustion of ethanol. C2H5OH + 3O2 → 2CO2 + 3H2O What are the products of the reaction?

Earth's atmosphere is made up of several gases. Which gas makes up over 75% of Earth's atmosphere?

Why does Earth have a greater gravitational pull than the Moon?

Several exploration vehicles have landed on Mars and have sent information back to scientists on Earth. Which characteristic changed after the vehicles landed on Mars?

Which statement describes a difference between a bar magnet and an electromagnet?

Molecules consist of two or more __________.

What is the result of all chemical changes?

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