Imagine the earth's hydrosphere began to dry up and disappear. all of the following would be affected except

a. heat released by the sun

b. the hydrologic cycle

c. living things in the biosphere

d. weather in the atmosphere

A boy weighing kilograms is riding a skateboard. He's moving at 2 meters/second and has 40 joules of kinetic energy. He doubles his speed when he sees his friends ahead of him. His kinetic energy at the faster speed is 80 joules.

How many moles of a gas sample are in a 20.0 L container at 373 K and 203 kPa? The gas constant is 8.31 L-kPa/mol-K. 0.33 moles 3.05 moles 1.30 moles 0.65 moles

Consider the following equation that describes the complete combustion of propane, C3H8. The bond energies are: C H 416 kJ/mol; C C 356 kJ/mol; OO 498 kJ/mol; CO 803 kJ/mol; H O 467 kJ/mol.

A 2.5% (by mass) solution concentration signifies that there is of solute in every 100 g of solution. 2. therefore, when 2.5% is expressed as a ratio of solute mass over solution mass, that mass ratio would be. 3.

Which of the following elements would be the most reactive? A. Strontium B. Nitrogen C. Chlorine D. Radon

How many of the following elements have 2 unpaired electrons in the ground state? C Te Hf Si A) 1. B) 2. C) 3. D) 4.

Which has a higher frequency, a neutron or electron? Why?

1) Identify the intensive properties of a sample of matter: A. mass B. hardness C. color D. volume E. reflectivity

Suppose you have a buffer containing 0.400 M hydrazine and 0.300 M hydrazinium chloride at equilibrium. Then you add 25.2 g of NaOH to 2.0 L of the buffer. What change in pH is caused by the addition of the base? A) 0.99 B) 0.40 C) 8.71 D) - 0.36

The heart is an example of which level of organization within an organism? O cell organ tissue organ system O O