Elements in the same group have similar chemical properties because

a their atoms are about the same size

b they have a similar atomic mass

c they have the same number of valence electron

d they have a diagonal relationship

If we place the like poles of two magnets facing each other what will happen? A. Nothing B. They will both become negative. C. They will attract each other. D. They will repel each other.

All of the following are examples of homeostasis within a cell except cells remove waste cells allow nutrients to enter cells extract energy from food cells move from one place to another

When 10.7 g of Al are reacted with 42.5 g of HCl, what volume of H2 will be produced at 47 C and 725 mmHg? Formula: 2Al+6HCl=2AlCl3+3H2

For a weak acid such as the side chain ε-amino group of a lysine residue in a protein, if the pKa of that specific residue's ε-amino group is exactly 10.0, in an environment in which the pH = 9.0, what would be the ratio of base to acid?

In an unconformity between two layers of rock how is the upper layer usually described

Allows water to pass through easily

Which is a cause of desertification? A. farming B. creating reservoirs C. overgrazing D. driving motor vehicles

What happens when the threat of exposure to dirty air is reduced in a community? There is enough oxygen available for people's lungs to function normally The amount of indoor air pollutants released during a fossil fuel burn decreases There is a

Is chicken noodle soup an element, a compound, a homogeneous mixture, or a heterogeneous mixture?

How is the amount of sunlight affect the makeup of an ecosystem