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block

Bonds between two atoms that are equally electronegative are _____.

Select the correct answer(s).  

(0/0)

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hydrogen bonds

polar covalent bonds

nonpolar covalent bonds

ionic bonds

none

The atomic number of chlorine is 17. The atomic number of magnesium is 12. What is the formula for magnesium chloride?

Select the correct answer(s).  

(0/0)

---

Mg2Cl

MgCl3

MgCl

MgCl2

none

In what way are elements in the same column of the periodic table the same? They have the same number of _____.

Select the correct answer(s).  

(0/0)

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electrons in their valence shells when neutral

electrons when neutral

protons

electron shells when neutral

none

What is the maximum number of hydrogen atoms that can be covalently bonded in a molecule containing two carbon atoms?

Select the correct answer(s).  

(0/0)

---

4

6

2

8

none

An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?

Select the correct answer(s).  

(0/0)

---

single bonds only

double bonds only

single, double, or triple

single and double only

none

Which of the following statements is FALSE?

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(0/0)

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Carbon, hydrogen, oxygen, and nitrogen are the most abundant elements of living matter.

Iron is needed by all humans

All life requires the same essential elements.

Some naturally occurring elements are toxic to organisms.

none

Fluorine has an atomic number of 9. Which of the following would you do to a neutral fluorine atom to complete its valence shell?

Select the correct answer(s).  

(0/0)

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Nothing. If fluorine is neutral, it has a complete valance shell.

remove 1 electron

add 2 electrons

add 1 electron

none

Refer to the figure above (first three rows of the periodic table). What element has properties most similar to carbon?

Select the correct answer(s).  

(0/0)

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nitrogen

boron

phosphorus

silicon

none

Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Therefore, which of the following can be true?

Select the correct answer(s).  

(0/0)

---

Isotopes of molybdenum have different numbers of electrons

Molybdenum atoms can have between 50 and 58 neutrons.

none

What results from an unequal sharing of electrons between atoms?

Select the correct answer(s).  

(0/0)

---

a hydrophobic interaction

an ionic bond

a nonpolar covalent bond

a polar covalent bond

none

About twenty-five of the ninety-two natural elements are known to be essential to life. Which four of these twenty-five elements make up approximately 96 percent of living matter?

Select the correct answer(s).  

(0/0)

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carbon, sodium, hydrogen, nitrogen

oxygen, hydrogen, calcium, nitrogen

carbon, hydrogen, nitrogen, oxygen

carbon, oxygen, phosphorus, hydrogen

none

Which of the following is true for this reaction? 3 H2 + N2 <=> 2NH3

Select the correct answer(s).  

(0/0)

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The reaction is nonreversible.

Only the forward or reverse reactions can occur at one time.

Ammonia is being formed and decomposed simultaneously.

Hydrogen and nitrogen are the reactants of the reverse reaction.

none

Which of the following are compounds?

Select the correct answer(s).  

(0/0)

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H2O, O2, and CH4

H2O and CH4, but not O2

O2 and CH4

H2O and O2

none

How many electrons will a single atom of sulfur with no charge and no bonds have in its valence shell (see the figure above)?

Select the correct answer(s).  

(0/0)

---

16

6

8

32

none

What is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen?

Select the correct answer(s).  

(0/0)

---

4

1

2

6