49. If an atom contains 13 protons, then it has (2.4)

a. 13 electrons. b. 26 electrons. c. 13 neutrons.

d. 26 neutrons,

A student drives 105.0 mi with an average speed of 61.0 mi/h for exactly 1 hour and 30 minutes for the first part of the trip. What is the distance in miles traveled during this time?

How does the Law of Conservation of Energy impact the amount of energy that is available on our planet?

Which was more difficult to determine (latitude or longitude) and why?

A ball has a mass of 140 g. What is the force needed to accelerate the ball at 25 m/s2? (Formula: F=ma)

Explain how fossil fuel use in the US makes us vulnerable to the demands of foreign countries.

How many electrons do most atoms seek to have on their valence shell? Using this information, explain why certain elements are unreactive and why other elements are reactive.

Which of the following statements is good advice to prevent becoming overly emotional? A. There is no way to prevent becoming overly emotional. B.

An ant is on the pendulum bob of a clock. What would be its displacement in one time period?

Every charged particle in the universe is surrounded by its own? A. both an electric and gravitational field B. Gravitational field C. Charged field D. Electric field E. Both and electric and charged field

How does an iron nail become a magnet when it is placed in a strong magnetic field