Which of the following is an example of chemical change? A.) stirring butter and sugar together B.) adding food coloring to water C.) burning a candle D.) breaking a rock into smaller pieces

A first order reaction has rate constants of 4.6 x 10-2 s-1 and 8.1 x 10-2 s-1 at 0ºC and 20ºC, respectively. What is the value for the activation energy?

5 uL of a solution is equal to how many nanoliters?

How to balance this equastion: _H2 + _O2 = _H20

Calculate the Cal (kcal) in 1 cup of whole milk: 12 g of carbohydrate, 9 g of fat, and 9 g of protein.

Which statement describes a strong acid? A. A strong acid is a substance that completely dissociates in water to produce an aqueous solution of H3O + and conjugate base ions. B.

A potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one electron. The potassium ion that forms has 18 electrons. What best describes the bromide ion that forms?

A 0.450 g0.450 g sample of impure CaCO3 (s) CaCO3 (s) is dissolved in 50.0 mL50.0 mL of 0.150 M HCl (aq) 0.150 M HCl (aq).

Define and explain bond energy.

A colorless, toxic, radioactive gas is called what

Making observations is the first step in the scientific method. Why don't scientists stop with the first step when creating an experiment? A.