A pure substance is matter that consists of matter with a composition that

Which of these is an acid

Which best describes the trends in electronegativity on the periodic table?

Relate observations about thermal expansion for real world situations

An ostrich can run at an average speed of 50 km/h. How long would it take an ostrich running at this speed to travel from Seattle, WA to Portland, OR (assuming the two cities are about 230 km apart) ? A. 3.3 h B. 4.1 h C. 4.3 h D. 4.6 h

Baking a cake is an example of - a. forming mixtures. b. forming solutions. c. exothermic reactions. d. endothermic reactions.

Which particles make up the nucleus of an atom? protons and electrons neutrons and electrons protons only protons and neutrons neutrons only

An egg is fried is that a physical or a chemical change

How many mono-; di -; and trichloro derivatives are possible for cyclopentane?

A gas occupies 3.60 L when the temperature is 45.0oC and at 1.02 atm of pressure. What temperature change (in K) will be needed to change the volume to 6.25 L at constant pressure?

When did Pangaea begin to break apart? a. 20 million years ago c. 250 million years ago b. 100 million years ago d. 2 billion years ago.