When substances are formed that are different from the starting substances, a physical change has occurred. True False

Enter the appropriate symbol for an isotope of potassium-39 corresponding to the isotope notation A/Z x

How many molecules are there in 2.30 grams of NH3

What monomers are used to construct this polymer and where are they found?

In pea plants, smooth seeds (S) are dominant and wrinkled seeds (s) are recessive. In a cross between two heterozygous plants, what are the possible allele combinations and seed types of the offspring?

What is the most appropriate si (metric) unit for measuring the length of an automobile?

Name 3 characteristics that can be used to identify minerals

Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecules ad contains 0.340 percent iron by mass. calculate the molar mass of hemoglobin

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

Elements on the periodic table are arranged by increasing?

What is the difference between molecular formula and molecular model