Name two elements that hace properties similar to those of the element calcium (ca).

These two beakers represent solutions of HCl and NaOH

A covalent compound is formed when a chemical reaction occurs between atoms of

What elements are lipids comprised of?

Which soil layer contain the most humnas

Why is water considered a polar molecule?

Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C

Before the initial explosion was the matter hot or cold

Which of the following atoms has seven valence electrons? chlorine (Cl) nitrogen (N) manganese (Mn) oxygen (O)