Which of the following is not an example of a chemical change?

Digesting food

Burning gas in an engine

Cooking eggs

Grinding pepper

15.00 mL of a NaCl solution that has a mass of 15.78 grams is placed in an evaporating dish and heated to dryness. The remaining solid has a mass of 3.26 grams.

A 36.41-g sample of calcium carbonate (CaC O 3) contains 14.58 g of calcium and 4.36 g of carbon. What is the mass of oxygen contained in the sam- ple? What is the percent by mass of each element in this compound?

Which of these is considered to be a native element

Grinding quartz crystals down to produce sand is an example of a

In an electrolytic cell, electrical energy drives a chemical decomposition reaction. In a voltaic cell, A.) a decomposition reaction generates heat energy. B.) chemical reactions are driven by heat energy. C.

Plants absorb light energy and store that energy in the form of what? A water B carbon dioxide C sugar D oxygen

If 21/825g hydrogen sulfate ion in 5litr water solotion, what the percentage of its ionization?

A redox reaction will occur at 298 K when zinc metal is placed in a solution that is 0.5M Fe (NO3) 3. Is this true or False.

Sodium chloride is stirred into water to form a solution. in this case, what are sodium chloride and the water?

1. A liquid is matter because it a) is hard, b) has its own shape, c) has mass and takes up space. d) living things could not survive without it.