Which of the following is a chemical reaction?

Two cups have the same amount of water. Cup 1 has 30g of salt. Cup 2 has 44g of salt. How does the density and concentration Cup 1 compare to Cup 2?

To make a solution less concentrated, you should...

A boy puts a marble in water and it sinks. This tells the boy that

It a solution is more concentrated than another, then it has a greater mass and weighs more.

Solution A has 8g of solid. Solution B has 10g of solid. Which solution is the least concentrated?

A salt water solution is 58g. After the water evaportes, what is the amount of salt left in the cup?

Solution 1 has 4 spoons of salt and 200 ml of water. Solution 2 has 2 spoons of salt and 100ml of water. Which would be more concentrated and heavier on a balance?

A solution that cannot dissolve any more solute and the solute sinks to the bottom is said to be

A student mixes a colorless liquid and a blue solid. When all of the solid dissolves, the liquid is blue. After 10 minutes, a solid powder appears on the bottom of the cup. What is the evidence that a chemical reaction occurred?

The original substances that are present before a chemical reaction are called

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