Any condition that can be changed in an experiment is called a variable. Which of these best explains why there should only be one variable changed in an experiment?

A force of 15 newtons is exerted on an object causing it to accelerate at 5 meters per second squared. What is the mass of the object?

An atoms of helium has two protons and a change of zero. How many electrons does an atoms of helium have?

Which of these describes the location of the neutrons in an atom?

Which of these statements about ions is true?

Which of these statements best describes the law of conservation of mass proposed by Antoine Lavoisier?

Which of these types of reactions absorbs heat from the surroundings?

Maria wants to find the density of a mineral sample. Which of these pairs of properties will she need to measure to determine the density?

Which type of energy does a skateboarder have before rolling down a ramp?

Which of these properties can be used to classify the different types of radiation given off by the sun?

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