A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

Which region (s) of the period table contains elements that can adopt both positive and negative oxidation numbers?

An electrically neutral atom of beryllium has four protons. Which Statement is true? -There are four neutrons in the nucleus. - There is a charge of + 4 on an atom of beryllium. - There is a charge of - 4 on an atom of beryllium.

Who developed the polio vaccine? George Marshall Jonas Salk Marie Curie Carlos Finlay

Each elements on the periodic chart is made up of a certain kind of atom. argree or disagree reason why

Which of the following have been determined as the oldest living tree types on Earth? Select all that apply. Bristlecone pine Mesquite Sequoia Ponderosa pine

Describe and give an example of parasitism.

Why is a dilute solution of oleic acid used instead of pure oleic acid?

The vapor pressure of benzene (C6H6) is 73.0 mm Hg at 25 °C. What is the vapor pressure of a solution consisting of 179 g of benzene and 0.217 mol of a nonvolatile nonelectrolyte?

Aldo drove 420 miles using 18 gallons of gas. at this rate, how many gallons of gas would he need to drive 357 miles

How many grams of As2S3 are in 3.25 moles?