How many electrons can be contained in the second energy level?

A. 2

B. 18

C. 10

D. 8

Which of the following is a single replacement reaction? CaO + H2O Ca (OH) 2 Mg + 2HNO3 Mg (NO3) 2 + H2 NaOH + HCl H2O + NaCl CH4 + 2O2 CO2 + 2H2O

A sample containing 0.213g Cl - is dissolved in 50.0ml of water how many moles of Cl - are in the solution?

The ability to react with oxygen is a physical property. True False

Tell how many significant figures this number contains: 18.20

What solid is brown and red, crumbly and weak in the periodic table (probably a metal)

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