Which sample is a pure substance?

A. a test tube of zinc oxide

B. a container of zinc and oxygen

C. a flask of pond water

D. a jar of soil

In ancient times, what would the Moon have looked like from the Earth?

What is the molecular weight of one mole of H2CO3? 29.018 62.0 62.026

Give 3examples of an element, define

What does condensation mean in the water cycle?

Barium chloride reacts with cooper (II) sulfate, to produce 0.0546 moles of barium sulfate how many moles of copper (II) sulfate was needed to produce this amount?

You have a balloon that is filled with 1000 cm3 of air. The balloon is inside your house where the temperature is 20°C. You take the balloon outside where the air temperature is 10°C.

12.5M AgNO3 is made using 3.5L H2O. How many grams AgNO3 are needed to produce the solution?

What is the net charge on an ion that has 9 protons, 11 neutrons, and 10 electrons? (1) 1 + (3) 1- (2) 2 + (4) 2-

The structure of the periodic table is based on the distribution

Which of the following prefixes means seven