Which of these changes do not involve forming or breaking chemical bonds? A) burning and melting B) rusting and cutting C) burning and digestion D) boiling and melting

A toy car engine pushes it forward at a constant speed. what happens if the force provided by the engine decreases? A. the toy car speed remains constant B. the toy car mass mass increases C. the toy car gains inertia D.

How much heat, in joules and in calories, must be added to a 75.0Â-g iron block with a specific heat of 0.449 j/g °c to increase its temperature from 25 °c to its melting temperature of 1535 °c?

Which statement best describes acceleration? Acceleration is the rate of change of force of an object. Acceleration is the rate of change of the direction of an object. Acceleration is the rate of change of velocity of an object.

Describe two differences between Mendeleev's periodic table and the modern periodic table

What's the momentum of 100 kilograms fullback carrying a football field on a play at a velocity of 3.5m/s?

If traveling at equal velocities, which object would have the most momentum

Which of the following happens when a material undergoes a phase change? a. The temperature changes. b. Heat flows into or out of the material. c. The chemical composition changes. d. The molecules break apart into atoms.

Friction between solids can be most accurately defined as the force that opposes the sliding motion of two surfaces that are touching each other. A. True B. False

1. For a reaction to occur, energy must be to break chemical bonds. O A released OB converted OC absorbed

51 Mm is how many km?