Mg +  __HCl  → MgCl2 + H2

What coefficient is needed to balance the equation?

Calculate the velocity of a 2-kg ball that has a momentum of 10kg • m/s west

A car starts from rest and reaches 20 m/s in 10 seconds. the average acceleration of the car in m/s2 is:

How much work is done to move 1 uC of charge from the negative terminal to the positive terminal of a 1.5V battery?

Two electrons are 2.3nm apart. What is the force between two electrons?

Work and energy have the same units because A. the words "work" and "energy" are interchangeable. OB. work is a measurement of the transfer of energy. C. work opposes energy. D. whenever work is lost, energy is gained.

Which drum would make a sound that fades away faster - one that makes a loud sound or one that makes a more mellow sound Why?

Which of the following is NOT a way to increase the solubility of a solid in water? A. crushing the solid B. shaking the mixture of solid and water C. raising the temperature of the water D. letting the mixture stand still a long time

Which of the following is true about cells? A. Cells have specialized components that perform different, specific functions. B. A cell's components are all identical and perform the same function. C.

How much heat is contained in 100 kg of water at 60.0 °C?

Which of the following statements is the best definition of weather? Weather is the current conditions in the atmosphere. Weather is the usual conditions in the atmosphere. Weather is the average conditions in the atmosphere.