A 50 W engine generates 50 J of energy. How long did it run for?

A. 10 s

B. 1 s

C. 5 s

D. 100 s

A car rolls down a ramp. What is the force acting on the car that causes the movement down the ramp?

The mass of an atom may be determined by adding the masses of the protons and neutrons in the nucleus. Why is it unnecessary to include the electrons when determining the mass of an atom?

Flexibility is the capacity to move a joint through its full range of motion. a. True b. False

What is a solution? a. The substance that dissolves another substance b. The substance that is dissolved in another substance c. Tow liquids that do not mix each other d. The mixture of one substance dissolved in another.

Which chemical equation represents a redox reaction? A. Mg (ClO3) 2 + 2HCl → MgCl2 + 2HClO3 B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu (NO3) 2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3

Which of the following would be a result of increased solar activity? A. Longer winters B. Warmer-than-normal sea surface temperatures C. Colder-than-normal sea surface temperatures D. Shorter summers

The electron configuration of an element is 1s22s22p63s23p64s1. why is this a representative element?

Why is scientific notation important in chemistry?

During translation, the new polypeptides are often directed to specific parts of the cell by the presence or absence of short sequences of amino acids called signal sequences.

Is potassium iodide an electrolyte or nonelectrolyte?