What is the composition of the black powder in a firework?

Classify each characteristics as either a metal or a non metal

What would happen to life if earth were in a different location within the solar system

Sodium atoms emit light with a wavelength of 330 nm when an electron moves from a 4p orbital to a 3s orbital.

Which is a substance that is made up of only one type of atom? O compound element solution mixture

Martina has a sample of an unknown substance, she measures the substance, its mass is 13.5 grams, and its volume is 5cm^3 which metal might her sample be made of? silver density: 10.49 g/cm^3 copper density: 8.96 gm/cm^3 iron density: 7.

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.