Why are hydrogen molecules called elements but water molecules are called compounds?

In a molecule of methane (ch4), what type of bond joins the carbon atom to each of the hydrogen atoms?

Consider conjugation. A long molecule contains a conjugated network of double bonds. Two of these double bonds begin at carbon 2 and carbon 8. At which carbon must a double bond also begin? 3 4 5 6 more than one of the above choices is correct

When humans burn fuel or cut down trees, they (increased or decrease) levels A. If it increases B. If it decreases

How many electrons would hydrogen required to fill up that first shell?

How many grams of h2 gas can be produced by the reaction of 63.0 grams of al (s) with an excess of dilute hydrochloric acid in the reaction shown below? 2 al (s) + 6 hcl (aq) → 2 alcl3 (aq) + 3 h2 (g) ?

Which substance is the limiting reactant when 4.0 g of sulfur reacts with 6.0 g of oxygen and 8.0 g of sodium hydroxide according to the following chemical equation: 2 S (s) + 3 O2 (g) + 4 NaOH (aq) → 2 Na2SO4 (aq) + 2 H2O (l) A. O2 (g) B. S (s) C.

If EG = 19 and FG = 12 then EF = ?

Given the following reaction: 4Fe + 302 → 2Fe2O3 How many grams of Fe2O3 will be produced from 24.0 g of Fe and 5.00 g of O2? grams (round to three significant figures)

Which Group 16 element combines with hydrogen to form a compound that has the strongest hydrogen bonding between its molecules? 1. oxygen 2. selenium 3. sulfur 4. tellurium

How many hydrogen atoms are in 2.80 mol of ammonium sulfide?