Question 2: The number of protons plus the number of neutrons in an atom is equal to its

A. atomic number

B. mass number

C. nuclear model

D. energy level

Which of the following statements about ice melting is true and why? A. Energy flows from the ice to its surroundings. B. Water molecules move from their fixed position. C. Water molecules lose energy. D.

Structures that trap light energy and perform photosynthesis

Simple machines are designed to increase A) gravity B) friction C) force D) mechanical advantage

As mass between two masses increase, the gravitational force of attraction between them

As the frequency of electromagnetic waves increases, what happens to the wavelength

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

Emission of light from an atom occurs when an electron