What causes chemical weathering? a. damage caused by animals and plants c. natural acids b. ice wedging d. physical factors

If an element has 4 valence electrons, how many dots will be in the elements dot diagram?

The standard normal curve is not symmetrical. a. True b. False

Why might a scientist change a hypothesis

How much work (in J) is done against the gravitational force on a 3.9 kg briefcase when it is carried from the ground floor to the roof of the Empire State Building, a vertical climb of 380 m?

Which question should Trudy write

The metric system and metric conversions are?

Ron bicycles forward with an acceleration of 2.1 m/s2. If he is applying a forward force of 195 N, what is his mass?

Diane swim 5 kilometers against the current in the same amout of time it took her to swim 15 kilometers with the current. The rate of the current was 2 kilometers per hour. How fast would diane swim if there were no current?

A man paddles a canoe in a long, straight section of a river. The canoe moves downstream with constant speed 5 m/s relative to the water. The river has a steady current of 1 m/s relative to the bank. The man's hat falls into the river.

In an atom, almost all of the mass is concentrated in a tiny nucleus because