1 of 441 of 44 Questions Question 1
Study the balanced chemical reaction.

2Cu + O2 → 2CuO

There are 6.45 g of copper(II) oxide (CuO) produced. What amount of the product, in g, is copper?

3.23 g

1.60 g

8.07 g

5.15 g

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

What are transitions between a liquid and a solid called? identify which way they are transitioning