What part of an atom has most of its mass

How many miles will a person run during a 10 kilometer race?

Give a chemical equation for aerobic cellular respiration

A 92.8 gram sample of Ba (OH) 2•4H2O (barium hydroxide tetrahydrate) is heated until water is released. How many grams of water were released?

Sulfur and magnesium both have two valence electrons. a. True b. False

Sarah performs an experiment to see whether bees prefer red flowers or yellow flowers. Look at this table of results from the What is the independent variable?.

Consider the following representation of a reaction mechanism. Step 1: Unimolecular (fast) Step 2: Bimolecular (slow) Step 3: Unimolecular (fast) Which conclusion about the rate law for the reaction above is reasonable? A.

1. Which of the following best describes an example of pure chemistry? a) testing the effects of lower concentrations of a drug on humans b) studying chemicals containing carbon c) developing a cure for osteoporosis d) finding an antidote for a new

Problem 1: For which of the following activities might you want to hire a chemist? A. building a garage B. testing a sample of water from a well C. finding a comet D.

Why do most living things need food water and the ability to get rid of waste?

What is the effect of adding more water to the following equilibrium reaction? CO2 + H2O - > 2H2CO3