Is energy added or removed when water boils?

How many moles of O2 are needed to react with 24 moles of C2H6?

What is the total number of atoms in the formula Ca (NO3) 2? (1) 7 (2) 2 (3) 3 (4) 9 The answer is 9 but I don't understand why, Can someone explain?

1) Which pure substance is composed of more than one element? A. carbon B. gold C. water D. sodium

What is the difference between a mixture and a compound? (need an easy two sentence answer (able to explain it to a 8 your old).)

A compound takes on: A. the properties of the strongest elements that compose it B. A mixture of the properties of the elements that compose it C. The properties of the most abundant elements that compose it D.

What clear, colorless chemical might be found in drinking water?

Sodium's atomic number is 11. What does this tell you about an atom of sodium?

Convert from °F to °C 36.8 °F → °C

2. How many grams of sucrose would be needed to prepare 100. mL of a solution of 0.10 M sucrose? Show your calculations.

You have two separate containers each filled with a gas. The containers have the same volume and are at the same temperature. The gases also exert the same pressure. Which of the following statements are true? a.