Describe the last major earth event involving an asteroid?

Is HSO4 - a polar or non polar molecule

I need a paragraph and five sentences for this the girl and her dog and the paragraph it should be very small.

Can energy be released when matter changes? Can it be absorbed? Can a change in matter take place in which energy is neither release nor absorbed

An element x has two naturally occurring isotopes: X-79 (abundance+50.69%, mass + 78.918amu) and X-81 (abundance+49.31% mass+80.917amu). Calculate the weighted atomic mass of X.

A mixture contains 1 gram of salt and 2 grams of sugar dissolved in 100 grams of water. Which other mixture would most likely have the same properties?

You are about to open a container of soy milk but notice that there are instructions to "shake well before serving." the soy milk is most likely a

Give reason: a. Fractionating columns with beads are used for fractional distillation b. Crystallisation is a better technique than evaporation

How can a gardener remedy soil that is overly acidic?

True or false everything has the same amount of energy?

4NH3 (g) + 502 (g) - >6H20g) + 4NOg) What is the enthalpy change for this reaction?