Which process represents a chemical change? (1) melting of ice (2) corrosion of copper (3) evaporation of water (4) crystallization of sugar

Why to organisms need natural resources?

How many moles of PbCl4 are needed to produce 2.00 g of Cl ions?

H2o is the chemical formula for water. in order to produce a single molecule of water, how many hydrogen atoms are needed?

If a sample of butene (C4H8) that has a mass of 259.9 g is combusted in excess oxygen, what is the mass of CO2 that is produced? C4H8 + 6 O2 ⟶ 4 CO2 + 4 H2O

What accurately pairs an atom to its charge

Which describes an object in projectile motion? Check all that apply. Gravity acts to pull the object down. The object moves in a straight path. The forward velocity of the object is 0 m/s. The object's inertia carries it forward.

How are blood transported in blood?

Is human cloning forbidden and why?

What do we beileve is at the center of the milky way A) two stars that have collided together B) a cluster of stars C) A black hole D) A collapsed planet

Why is science important?