An increase or decrease in energy during a chemical reaction is called

Why is a solution not a pure substance? A) It is made up of two substances that are chemically combined. B) It is made up of one substance. C) It is a mixture between a solute and solvent. D) The solute and solvent cannot be separated.

Why is a bowling ball harder to lift than a basket ball? Is it bc a bowling ball is made of metal?

Sort the following situations into chemical change or physical change: 1. salt dissolves in water 2. Hydrochloric acid reacts with magnesium to produce hydrogen gas 3. a piece of copper is cut in half 4. a sugar cube is ground up 5.

4. What type of substance would be best for use in a heating system? A liquid with a high specific heat A liquid with a low specific heat A gas with a low specific heat An explanation of why the answer is right.

On 4. Which of the following is true about the Sun? OA. The Sun is the only star in the Universe. OB. The Sun is one of many stars in the Solar System. OC. The Sun is one of many stars in the Milky Way Galaxy. OD.

Enter a chemical equation for LiOH (aq) LiOH (aq) showing how it is an acid or a base according to the Arrhenius definition. Consider that strong acids and bases dissociate completely. Express your answer as a chemical equation.

Percent copper in brass lab

Which statement best describes Rutherford's model of the atom?

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting