How many single covalent bonds in urea?

Negative ions form when atoms___valence electrons

How is weathering related to the geologic cycle

A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic-resistant strain of the bacteria becomes prevalent. Which mechanism explains this phenomenon?

Andre is predicting the products of chemical reactions. In one reaction, a hydrocarbon is the only reactant. What is the best prediction and explanation of this reaction?

Which rigid cylinder contains the same number of gas molecules at STP as a 2.0-liter rigid cylinder containing H2 (g) at STP? (1) 1.0-L cylinder of O2 (g) (2) 2.0-L cylinder of CH4 (g) (3) 1.5-L cylinder of NH3 (g) (4) 4.0-L cylinder of He (g)

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda