Choose the letter of the choice that best completes the statement or answers the question.

Which of the elements listed below is a metal with 2 valence electrons?

a.

magnesium

c.

platinum

b.

uranium

d.

chlorine

Which product of respiration is used for tissue repair and cellular function? carbon dioxide water energy oxygen

How many grams of sodium bromide would be produced from the complete reaction of 41.3 g AgBr

Chemistry an atom of strontium has at least four different isotopes. what is different between an isotope of 86sr and an isotope of 87sr? answers

An alpha particle is made up of A. two protons and two electrons B. two electrons only C. two protons and two neutrons

The temperature of a 6.0-g sample of glass changed from 20 C to 45 C when it absorbed 550 J of heat. What is the specific heat of this glass sample? a. 3.7 J/g C b. 0.27 J/g C c. 2300 J/g C d. 130 J/g C

What are some chemacial changes in your school?

Which of the following is an example of a double-replacement reaction? A. 3K + AlCl3à 3KCl + Al B. KOH + HBr à KBr + H2O C. CH4 + 2O2à CO2 + 2H2O D. Cu + 2H2SO4à CuSO4 + SO2 + 2H2O

Distinguish between thermal cracking and catalytic cracking

At the end of the reaction you washed the chemicals into a beaker using water. Why was it OK to use water to do this if Grignard reagents are very reactive towards water?

What happens when the electron moves from the first energy level to the second energy level? Energy is absorbed, and an emission line is produced. Energy is released, and an emission line is produced. Energy is absorbed by the atom.