Hydrogen fuel cell powered cars emit?

a. oxygen

b. carbon dioxide

c. hydrogen

d. water

Unique to primary growth is the fact that it A. increases the thickness of the stems. B. lengthens the height of the stems. C. occurs in the cork cambium. D. takes place in the vascular cambium.

Meteorology is best defined as the study of

Consider the substances below. • 1 mol of beryllium • 1 mol of salt • 1 mol of water • 1 mol of hydrogen Which statement is true about these substances? 1) They have exactly the same mass. 2) They have different numbers of particles.

Two liquids are shaken together in a test tube to produce a mixture that quickly separates into two layers. Which of the following best describes the behavior of the above pair of substances? soluble insoluble miscible immiscible

What is the change in heat energy when 132g of copper at 32.2°C is raised to 45.0oC? The specific heat of copper is 0.385 J/g °C.

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?