Witch substance is a combination of different atoms

A - homogeneous mixture

B - heterogenous mixture

C - element

D - compound

Give examples of temporaty physical change

Le chateliers principle tells us that the addition of a chemical?

Which is the correct name of the compound Cu3N2?

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?

Which type of fossils is formed by sediments and found in sedimentary rock

Which substance contains bonds that involved the transfer of electrons from one atom to another? (1) CO2 (3) KBr (2) NH3 (4) Cl2

Write the ka expression for h2po4 - in water. click in the answer box to activate the palette.

Why are ethics important when considering experiments? O A. It is important that people are not harmed for the sake of science. O B. Scientists would not be able to get funding if their experiments were not ethical. O C.

When the pH value of a solution is changed from 2 to 1, the concentration of hydronium ions ... A) decreases by a factor of 2 B) increases by a factor of 2 C) decreases by a factor of 10 D) increases by a factor of 10

Nonmetals rarely lose electrons in chemical reactions because?