According to the Periodic Table of Elements, Calcium has:

A. 20 protons and 20 electrons

B. 40.08 protons

C. 20 protons and 20.08 electrons

D. 20 protons and zero electrons

Chlorophyll a is one of the green pigments found in plants. Chlorophyll a has the molecular formula C55H72MgN4O5. How many atoms are in this molecule? A-136 B-137 C-138

You're writing the instruction manual for a power saw, and you have to specify the maximum permissible length for an extension cord made from 18-gauge copper wire (diameter 1.0 mm). the saw draws 9.

In which situation is no work considered to be done by a force?

The ph of a 0.24 m solution of dimethylamine is 12.01. calculate the kb value for dimethylamine.

It takes you 5 hours to complete a 375 kilometer trip. What was your average speed on this trip?

What is the theoretical empirical formula of magnesium oxide

8. which change in state is associated with the heat of vaporization, 1. solid to liquid 2. liquid to vapor 3. solid to vapor 4. liquid to solid

A mixture of calcium carbonate, CaCO3, and barium carbonate, BaCO3, weighing 5.40 g reacts fully with hydrochloric acid, HCl (aq), to generate 1.39 L CO2 (g), mea sured at 50°C and 0.904 atm pressure.

Which of the following is the major advantage of using geothermal energy instead of using coal energy? Choice: You will get a brainliest! If your correct! A. More abundant than coal B. Easier to access than coal C. Releases less carbon dioxide D.

Why can equilibrium not be reached in reversible enzymatic rxn?