How many energy levels does sulfur have?

A. 2

B. 3

C. 4

D. 14

Nickel metal is added to a solution of copper (ii) nitrate. express your answer as a chemical equation. identify all of the phases in your answer. enter no reaction if no reaction occurs.

Scientists found a fern fossil in some rock layers of the Grand Canyon. They estimated that a sample of one of the fossils originally contained 1000 carbon-14 atoms when it became 'fossilized', and at the time it was tested, it only contained 250

Which is the term for the group of proteins that organizes and condenses long strands of dna into tight coils?

The chromosomes line up across the middle of the cell

Is a Magnesium ribbon (Mg) a pure substance or a mixture?

How to find the better buy of two of the same item, but they have different units of measurements and different costs.?

The agricultural practice of spraying insecticides leaves behind which pollutant in the soil? A. Chemical poison B. Excess nitrogen C. Excess salt D. Acidic compounds

What is the name of the compound composed of iron and carbonate? [hint: iron has a + 3 charge in this compound]?

In a chemical equation the products appear on which side of the equation? A. Left B. Top C. Right D. Bottom

What does the shape of a protein molecule resemble?