What do you understand by

eclipse?

Which statement best compares the moon and Earth? They both spin at the same speed. The moon has carbon dioxide, but Earth has oxygen and nitrogen. They both take the same time to complete one revolution around the sun.

In a bottle of coke which would you expect to be higher, the concentration of H + or the concentration of OH+? Why?

What term is being defined below? the total amount of greenhouse gases produced by individuals or other entities in a given time period a. global warming b. ozone depletion c. carbon footprint d. reef destruction

Is it true that Organisms need water, vitamins and minerals. But they do not need salt to function.

1. Define the terms "atomic number" and "atomic mass." 2. Explain how you can use both of these terms to find the number of protons, neutrons, and electrons in a neutral atom of Neon (Ne).

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?