A train took 18 hours to finish 1530 miles journey. What was the average speed of the train during this journey?

Wht is the solarsystem

I'm a chemical equation which symbol should be used to indicate that a substance is in solution

Which example best describes a double displacement reaction? The ions of two ionic compounds switch places and a gas is formed. A compound reacts with oxygen to release a lot of heat. One compound breaks down into two different compounds.

Looking at the pH scale, which pair of substances would you predict will produce a solution closest to pH 7 when they are mixed together in equal amounts?

4. 213.4 grams of NaNO3 contain how many moles?

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.