Calculate how many valence electrons are in H2CO, N2, Cl2?

Which indicAtor would you use to chose to identify an unknown substance as an acid or base? Why?

Put the steps in the homeostasis of potassium ions in order.

The density of ethanol at 20 °C is 0.791 g/mL. How many milliliters of ethanol correspond to 12.0 g of ethanol at 20 °C?

How many meters are equivalent to 12 US gallons?

Which of the following is not a pure substance

Look at the reaction below. Upper H subscript 2 upper S upper O subscript 4 (a q) plus upper Upper M g (s) right arrow Uper M g upper S upper O subscript 4 (a q) plus upper H subscript 2 (g). Which substance is the acid in the reaction?

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer

Hardness of metals can be decreased by: (a) adding interstitial alloying elements (b) making glassy metals through extremely high cooling rates (c) annealing using slow cooling from high temperatures (d) cold-working or deforming at low temperatures

What happens to the reactivity of metals from left to right across the periodic table?

Does my body get all its energy from the sun?