A 21 g sample of calcium is heated and placed in a calorimeter containing 18 g of water. The temperature of the water eventually increases a total of 4°C. What was the total change in temperature of the calcium sample rounded to the nearest (positive) whole number?

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

What is the theoretical yield of carbon dioxide? a)0.993 gb)2.98 gc)3.65 gd)8.93 g

Can someone me with these questions plz.