A change in the properties of matter that does not change the identity of the substance is

a chemical change

a physical change

an ionic change

a covalent change

Is this statement true or false? Acids are corrosive. A. True B. False

Consider the balanced chemical equation 2c2h6+7o2 - 4co2+6h20. how many moles of h 2 o are produced when 1.0 mol of c 2h 6 reacts with excess o2?

Sulfate buffer? Your laboratory is out of materials to make phosphate buffer and you are considering using sulfate to make a buffer instead. The pKa values for the two hydrogens in H2SO4 are - 10 and 2.

Which of the following most likely happens when the number of particles of a gas decreases? The pressure of the gas increases The pressure of the gas remains same The number of collisions of gas particles decreases The number of collisions of gas

Name and write the structures of all isomers of the propyl and butyl alkyl groups.

A chemist heats a sample of hydrated lithium nitrate which weighs 170 grams and finds, after heating that it weighs 95.3 grams. What is the percent of water in the hydrate?

What is toxicity? Give an example of something from your home.

Why was it important to polish the copper strips and wire, the coin, and the nail in the electroplating experiment? You need to remove a layer of copper from the surface of each material.

Which response includes all the following that are properties of most metals, and no other properties? Z1) They tend to form cations. Z2) They have high first ionization energies. Z3) They have outer electronic shells that are more than half-filled.

How many o atoms are present in 1.04 mol of mgso4?