Which of these is an example of a chemical change?

feeling ice melt on your skin

crushing ice with a hammer

smelling sprayed perfume

leaving she's out to get moldy

What is the partial pressure of carbon dioxide in a container that contains 3.63 mol of oxygen, 1.49 mol of nitrogen, and 4.49 mol of carbon dioxide when the total pressure is 871 mmHg?

If you pass electricity through pure water so that it changes to hydrogen and oxygen gas, what type of reaction has taken place? A. Synthesis B. Decomposition C. Single displacement D. Double displacement

What change in energy occurs when you burn coal or petroleum?

What is the correct scientific notation for 640,000,000? Question 5 options: A. 6.4X10^8 B. 6.4X10^10 C. 64X10^10 D. 640X10^8

3. For the reaction: 2X + 3Y 3Z, the combination of 2.00 moles of X with 2.00 moles of Y produces 1.75 moles of Z. What is the percent yield of this reaction?

Whats the answer to 7/2 * 1/5?

Which statement correctly describes the relationship between reactant and yield? The actual yield is calculated from the amount of the excess reactant present. The actual yield is calculated from the amount of the limiting reactant present.

Balance the following reaction. Leave the box empty if no other coefficient is needed. C2H5 + O2 → CO2 + H2O

What three human body systems coordinate cause an arm to move

Which statement does NOT apply to Alkenes? They readily react They have double bonds They are more stable than alkanes They are unsaturated