A sample composed only of atoms having the same atomic number is classified as

1. A compound

2. A solution

3. An element

4. An isomer

Which contributes to the polarity of a water molecule? B. deflection of hydrogen atoms by lone pairs of electrons C. no difference in the electronegativity of oxygen and hydrogen

How will two electrons react with each other?

The air we breathe is approximately 21% oxygen. atypical breath has a volume of 450 ml. how many grams of O2 are in a breath of air

Choose the correct statement. The cathode is the electrode where the oxidation takes place. Both oxidation and reduction may take place at the cathode, depending on the cell. The cathode is always positive. The anode is always negative.

A solution that is 20% acid and 80% water is mixed with a solution that is 50% acid and 50% water. If twice as much 50% acid solution is used as 20% solution, then what is the ratio of acid to water in the mixture of the solutions?

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.