Which of the following is a compound?

a. H2O

b. He

c. O₂

d. Ca

Halogens are active non metal

There are 3 type of polar bear one with thick coat one with thin and one with medium which polar bear will not benefit from natural selection

The measurement 0.41006 gram, rounded to three significant figures, is expressed as

Which of the following is not included in John Dalton's modern theory of the atom? A. Atoms cannot be destroyed or divided up any further. B. The atoms that make up an element are identical to each other C.

Which of the following is not a definition of an acid? A substance that increases the hydroxide ion concentration of a solution A hydrogen ion donor in a reaction A substance that increases the hydronium ion concentration of a solution An

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack) ?

A gay cylinder what are the variables in gay-lussacs law