Hydrogen fuel cell powered cars emit?

a. oxygen

b. carbon dioxide

c. hydrogen

d. water

When heat is added to or removed from a substance, it may change its state. What state will most likely result if heat is added to a liquid?

The type of solution formed by creek water after heavy rain is called a colloid. true or false.

Using the chemical equation below, how many moles of Al2O3 produce when 105 grams of Al are reacted? 2Al+Fe2O3 - > Al2O3+2Fe

What will happen to the final pressure of a cylinder when the volume is doubled.

What volume of 0.6 m hcl is required to neutralize 100.0 ml of 0.5 m naoh?

What mass of copper is consumed in the reaction with hydrochloric acid if 10.0 g of gas is collected?

How does the movement of molecules inside a solid block of iron change as the iron is heated? The molecules move faster. The molecules move slower. The molecules stop moving completely. The molecules move in the same way at all temperatures.

Read the following passage: The movement of tectonic plates buries a rock deep inside Earth. Intense heat and pressure change the mineral composition of the rock and transform it into Rock A.

What is a change which forms one or more new substances?

Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+? (1) The Cd atom gains two electrons and its radius decreases. (2) The Cd atom gains two electrons and its radius increases.