How many years about was most of North America in the southern hemisphere?

An atom of gold has a mass of 3.271*10^-22g. How many atoms of gold are in 5.00 g of gold?

Elena makes the table below to determine the number of atoms of each element in the chemical formula 3 (NH4) 2SO4 Total atoms Element Nitrogen Hydrogen Sulfur | Oxygen What mistake did Elena make?

When adding the measurements 42.1014 g + 190.5 g, the answer has ___ significant figures.

A lab involves using a hot plate to heat a beaker of water. Which safety precautions must be observed? A. Eye protection, open flame safety, thermal safety, clothing protection B. Fume safety, hand protection, eye protection, clothing protection C.

322 l of hydrogen occupies volume of 197 l at stp. what was the initial pressure exerted on the hydrogen constant

Which of the following is not true about the importance of the carbon cycle to living things? a. Plants use carbon dioxide to make energy. b. Carbon is the second most abundant molecule in organisms. c.

Fruit flies can either have a brown body or a black body. The allele for a brown body (B) is dominant to the allele for a black body (b). A brown fruit fly was crossed with a black fruit fly as shown below.

A light-year measures the distance a light beam can travel in one year. One light-year is equal to 9 500 000 000 000 kilometers.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window