Which of these is an example of a physical change?

A) sugar dissolving in warm water

B) iron rusting in the presence of moist air

C) wood burning in the presence of oxygen

D) baking soda reacting with acid to form a gas

How does natural gas affect the way humans live

An enzyme is a special kind of catalyst that works to a. speed up a specific biochemical reaction. b. break down chemical elements. c. slow down a chemical reaction. d. maintain the correct temperature for a reaction.

All of the following are true of carbohydrates except 1. they are the structural elements in cell walls 2. they are only found in plants and bacteria 3. they make up larger compounds like fats and amino acids 4.

Compared to water most metals have low specific heat

In Antoine Lavoisier's classic experiment, mercuric oxide is heated in a sealed container. The solid red powder is changed into two products: silver liquid mercury and oxygen gas.

Name the two sub-atomic particles in the nucleus of an aluminium atom.

Identify the true statement. Choose one: A. The expansion of ice sheets at the end of the Pleistocene caused glacial rebound in northern Canada. B. Regions covered by glacial ice are termed periglacial environments. C.

What is the concentration when 0.065 moles of NaNO3 are dissolved in enough water to make 150.0 mL of solution?

What are the reactants and products of cellular respiration and photosynthesis?

Which situation would probably NOT result in the formation of new species? A) The introduction of a predatory fish that only eats the largest native bass in a Georgia lake.