Which is the best time to apply sunscreen?

Before going to bed

Just after going out in the sun

1 hour after going out in the sun

30 minutes before going out in the day

Which set of compounds illustrates the law of multiple proportions? so2, so3 h2o, h2o2 n2o, no, no2 all of these?

Describe how to separate a mixture of sugar and water.

A gas has a volume of 1.6 liters at STP. What is the new volume when the temperature is changed to 60k and the pressure stays to constant at 1.0 atm?

If the mass of a material is 40 grams and the volume of the material is 9 cm^3, what would the density of the material be?

Matter is niether created nor destroyed in any chemical change. Is this a theory or a law?

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%.