What kind of waves are used in many forms of communication

Which statement about a chemical reaction is true?

Magnesium metal burns in the presence of oxygen gas to produce solid magnesium oxide. You are given 4.00 grams of magnesium and an excess of oxygen gas in a tank. How many grams of magnesium oxide can be produced?

Molar mass is a generic term for the # of g/mol. What term is used to describe elements? A Atomic mass B formula mass C molecular mass Description SubmitToggle Dropdown

Which are produced when HCl reacts with Ca (OH) 2?

Is water from a swimming pool a heterogeneous mixture or a homogeneous mixture

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.

Which best identifies why the rusting of an iron nail in the presence of water and oxygen is in oxidation-reduction reaction

In the laboratory hydrogen gas is usually made by the following reaction:Zn (s) + 2HCl (aq) = H2 (g) + ZnCl2 (aq) How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mmHg and a temperture of 21 Co, can made from 3.

Whats the answer i need to know to get my paper done and if i don't get done i will fail chemistry.

3. Hydrogen cyanide (HCN) is a colorless gas. It is poisonous and smells like almonds. Draw a Lewis structure for this compound, explain why you drew the Lewis structure the way that you did, and predict the shape of the molecule