When an atom loses an electron, it becomes a

a. positive ion.

b. negative ion.

c. neutral ion.

d. neutral atom.

A person jogs 4. o km in 32 minutes then 2.0 km in 22 minutes and finally 1.0 km in 16 minutes. What is the joggers average speed in km per minute

A hydrogen atom has a diameter of about 10 nm. a. Express this diameter in meters. b. Express this diameter in millimeters. c. Express this diameter in micrometers.

This passage describes a chemical reaction. Read the passage. Then, answer the question below. As the cells in your body break down food, a poisonous substance called ammonia (NH3) begins to build up in your blood.

A wave is traveling down a string at 21 m/s. (a) What is the wave's amplitude? (b) What is the wave's wavelength? (c) What is the wave's frequency? (d) What is the wave's period?

Kim holds a pinwheel in the air and says it can be used to model a source of energy. Identify the type of energy Kim's pinwheel models. Explain the type of energy source used.

Science fair project

What does this graph show about the relationship between mass and acceleration? As acceleration increases, mass increases. As acceleration increases, mass is unaffected. As mass is unaffected, acceleration decreases.

The measure of the distance an object travels in a certain length of time is the object's

A wave is a (blank) that carries (blank) from one place to another

The movement of thermal energy from hot to cold materials is called