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Res 200 unit 4 exam
Question | Answer |
---|---|
What is the empirical formula for magnesium oxide? | MgO |
Select any factors below that can influence the rate of a chemical reaction? | I, II, and III only • I. Concentration of reactants •II. Temperature •III. Catalysts |
Because alcohol can act as a __________ after its ingestion, ______________ can result. | vasodilator, hypothermia |
It can be stated that during covalent bonding the bond that is formed results from the formation of oppositely charged ions. | False |
From the statements below select the one that best describes the atomic number? | The sum total of the number of protons in the atom's nucleus |
What is the empirical formula for magnesium bromide? | MgBr2 |
Ionization describes the process of atoms that lose or gain electrons in an effort to complete their outer shells. | True |
True or False: The correct formula for calcium chloride is CaCl2 | True |
Without the increase in reaction rate caused by the catlysts known as digestive ___________, it would take each of us 50 years to digest a single meal. | enzymes |
In order to complete an octet in their outermost energy level when forming a chemical bond, atoms will _____________________. | I, II, and IV only •I. gain electrons• II. lose electrons •IV. share electrons |
How many electrons are needed in the 3rd Energy Level for the element Mg? •Energy Level 1 = 2 •Energy Level 2=8 •Energy Level 3 = ? | 2 |
The octet rule for the above fluorine molecule is complete: | True |
Which of the following are considered polyatomic ions? I. HCO3- II. SO42- III. NaF IV. CN- | I, II, and IV only I. HCO3- II. SO42- IV. CN- |
True or False: The correct name for Mg(OH)2 is magnesium hydroxide | True |
What is the empirical formula for sodium chloride? | NaCl |
The oxygen molecule (O2) is formed through ____________ bonding. | pure covalent |
If you have 3.612 x 1023 molecules of a substance, how many moles would you have? | 0.6 moles |
A compound can be described as __________________________ | two or more elements joined together by a chemical bond. |
Catalysts can increase the rate of a reaction by ____________. | decreasing the activation energy |
The minimum energy required for a reaction to occur is called the activation energy. | True |
Determine the compound formed when bonding occurs between the following atoms? | KCl |
Which type of bonding involves the sharing of electrons between atoms? | Covalent |
Which element has the following electron configuration? •Energy Level 1 = 2 •Energy Level 2 = 8 •Energy Level 3 = 7 | Cl |
The mass number of an atom can be described as _____________________. | the sum of the protons and neutrons in the nucleus. |