Which of these is an example of a physical change?

sugar dissolving in warm water

iron rusting in the presence of moist air

wood burning in the presence of oxygen

baking soda reacting with acid to form a gas

Light, x-rays, microwaves, and radio waves are examples of which type of energy?

Why must the beakers used to carry out each reaction be completely dry?

Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right. The second solution turns purple. A possible hydrogen ion concentration for this solution is: A. 1 * 10-2 M B. 7 * 10-3 M C.

What differentiates one element from another

How many moles of PbCO3 are there in 10.0l of 2.0M solution?

Convert 3.57 moles of aluminum to grams

An average microwave uses a frequency of 2.54 GHz. How much energy is emitted?

Why scientist form a hypothesis

Step two of the procedure states: "Using sterile technique, place a loopful of inoculum from the M. luteus culture in the drop of nigrosin and mix." Which of the procedures qualifies as sterile technique?

If 4.34 moles of potassium react with excess water, how many moles of hydrogen gas would be produced at STP