Which change is exothermic?

a: Icebergs shrink as global temperature rises

b: Solid water turns to liquid water as energy is added

c: Rain becomes sleet when the temperature falls below 0°C

What type of rock is created when lava cools and hardens?

On Earth an object weighs 50 N. On Planet X, the object weighs 500 N. What conclusion can be drawn from these observations? A. Planet X has less mass than Earth. B. Earth has a greater diameter than Planet X. C.

Which numerical setup can be used to calculate the heat energy required to completely melt 100. grams of H2O (S) at 0°C? 1. (100. g) (334 J/g)

Which component is released from the active site of an enzyme during a chemical reaction? reactant product substrate protein

Which of the following is not an agent of metamorphism? pressure running water hydrothermal solution

Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of solution should she use?

A student makes observations when water is added to a blue solution of copper sulfate. The student makes only 1 observation: the solution changes to a lighter shade of blue. Is this an example of a chemical reaction? Explain your reasoning.

When dos the spring tide occur

As ice transforms into steam, Question options: new molecules are formed. the types of atoms are changed. energy is absorbed by the molecules. the mass of the molecules is increased.

Why do chemists consider the periodic table so useful?