A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use?

What are some examples of replacement reaction?

An electric range burner weighing 683.0 grams is turned off after reaching a temperature of 477.6°C, and is allowed to cool down to 23.2°C. Calculate the specific heat of the burner if all the heat evolved from the burner is used to heat 552.

The enzyme urease catalyzes this reaction. If urease is added to a solution that contains ammonia and other nitrogen-containing compounds (but no urea), will the urease catalyze any reactions? E

A hydrocarbon has the molar mass 26.04 g/mol. what is a possible formula

What is the color of bromcresol green indicator in a solution with a pH of 2.0

An atom that loses an electron is called a?

Which family on the periodic table contains elements that already have the octet in their valence energy level? a:family 1 b:family 13 c:family 15 d:family 18?

A scientist measures the pH of some rain water and finds that it is acidic. Which pH corresponds with the acidic quality of the rain water? A. 6 B. 7 C. 8 D. 9

Polyatomic ions formula for calcium iodate

Why did Whittaker propose a five kingdom system