A rock falls off a cliff and hits the ground after three seconds. What is its velocity right before it hits the ground?

9.8 m/s

0.31 m/s

29.4 m/s

3.3 m/s

Sodium (NA) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A) 0 B) 1 C) 9 D) 11

When would a life scientist study a nonliving thing such as a rock or lake

Which is a net ionic equation for the neutralization of a weak acid with a strong base? which is a net ionic equation for the neutralization of a weak acid with a strong base?

When the temperature of air rises, the amount of water needed for saturation A. increases. B. decreases. C. stays the same. D. increases until it reaches a certain temperature, then drops.

Would it be easier or more difficult (compared to zinc) to recover silver from solution?

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False

An equilibrium is dynamic. True False