Homework answers / question archive / QUESTION 1 Which of these pictures is consistent with modern research about atoms?         C     D     B     E 3 points    QUESTION 2 What is the formula for dinitrogen trisulfide?     NS     N3S2     N6S6     N(II)(S(III)     N2S3 3 points    QUESTION 4 Which sample takes up the most space?     5 grams of a sample with a density of 2 g/mL     more information is needed     2 grams of a sample with a density of 5 g/mL     5 grams of a sample with a density of 3 g/mL     6 grams of a sample with a density of 3 g/mL 3 points    QUESTION 5 Gigglyum, with the symbol Gi, is a fictitious nonmetal element in group 15 of the periodic table

QUESTION 1 Which of these pictures is consistent with modern research about atoms?         C     D     B     E 3 points    QUESTION 2 What is the formula for dinitrogen trisulfide?     NS     N3S2     N6S6     N(II)(S(III)     N2S3 3 points    QUESTION 4 Which sample takes up the most space?     5 grams of a sample with a density of 2 g/mL     more information is needed     2 grams of a sample with a density of 5 g/mL     5 grams of a sample with a density of 3 g/mL     6 grams of a sample with a density of 3 g/mL 3 points    QUESTION 5 Gigglyum, with the symbol Gi, is a fictitious nonmetal element in group 15 of the periodic table

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QUESTION 1

1. Which of these pictures is consistent with modern research about atoms?

 

 

		C
		D
		B
		E

3 points   

QUESTION 2

1. What is the formula for dinitrogen trisulfide?

		NS
		N3S2
		N6S6
		N(II)(S(III)
		N2S3

3 points   

QUESTION 4

1. Which sample takes up the most space?

		5 grams of a sample with a density of 2 g/mL
		more information is needed
		2 grams of a sample with a density of 5 g/mL
		5 grams of a sample with a density of 3 g/mL
		6 grams of a sample with a density of 3 g/mL

3 points   

QUESTION 5

1. Gigglyum, with the symbol Gi, is a fictitious nonmetal element in group 15 of the periodic table. What is the formula of the covalent compound it forms with selenium?

		GiSe
		Gi6Se5
		Gi2S3
		the formula cannot be predicted
		Gi5Se6

3 points   

QUESTION 6

1. Smileyum, with the symbol Sy, and frownium, with the symbol Fn, are fictitious nonmetal elements. Smileyum is in group 16 and Frownium is in group 17. Draw the Lewis structure for SyFn₂. There are ____ lone pairs, ____ single bonds, and ____ double bonds around the Sy atom in the Lewis structure.

		4,0,0
		0,2,2
		1,2,1
		2,2,0
		0,0,2

3 points   

QUESTION 7

1. Gigglyium and happyium are fictitious elements. Which of the following information allows determination of if an atom is a gigglyum atom or a frownium atom?

		none of these
		the number of neutrons in the atom
		the mass number of the atom
		more than one of these
		the number protons in the atom

3 points   

QUESTION 8

1. In this picture, picture A is an example of a ___________ and picture B is an example of a ___________.

 

 

		compound, element
		more information is needed
		compound, compound
		mixture, compound
		mixture, element

3 points   

QUESTION 9

1. Which of the following is definitely not an indication of a chemical change?

		the process is reversible
		the substances got colder when they were mixed
		a liquid boiled
		the sample catches fire
		the color of the sample changed

3 points   

QUESTION 10

1. Frownium, with the symbol Fn, is a fictitious element in group 1. Name Fn₂SO₄.

		difrownium monosulfur tetroxide
		frownium(I) sulfate
		difrownium sulfur tetroxide
		frownium sulfate
		frownium sulfur oxide

3 points   

QUESTION 11

1. How is the number below the element symbols in our periodic table obtained?

		measuring the mass of an atom of a specific isotope
		counting protons
		calculating the sum of proton and neutron masses
		calculating a weighted average of atomic masses
		removing outer electrons

3 points   

QUESTION 12

1. What is the meaning of the dots in the picture below?

 

 

3 points   

QUESTION 13

1. Which of the following is not an example of a pure substance?

		air (mostly N2)
		salt (NaCl)
		sugar (C12H22O11)
		oxygen (O2)
		more than one of these

3 points   

QUESTION 14

1. Match the measurement type to the measurement unit.

-           A.           B.           C.           D.       volume          -           A.           B.           C.           D.       distance          -           A.           B.           C.           D.       time          -           A.           B.           C.           D.       mass

A. cm3 B. mg C. fs D. nm

3 points   

QUESTION 15

1. Gigglyum is a fictitious element in group 16 of the periodic table. How many valence electrons does a gigglyum atom have?

		3
		6
		2
		16
		more information is needed

3 points      

QUESTION 17

1. Which of the following is not a factor when determining if a molecule is polar or nonpolar?

		bond polarity direction
		bond polarity
		electronegativity
		molecular shape
		magnetic character

3 points   

QUESTION 18

1. Which of the following means the same as 1.5x10^-3 grams?

		none or more than one of the other answers is correct
		1.5 kg
		1.5 Mg
		1.5 mg
		1.5 g

3 points   

QUESTION 19

1. Write the symbol for an element that is expected to have chemical properties similar to those of phosphorus. 

3 points   

QUESTION 20

1. Frownium, with the symbol Fn, is a fictitious element in group 2 and happyum, with the symbol Hy, is a fictitious nonmetal element in group 17. What is the formula of the ionic compound they form?

		Fn2Hy7
		FnHy2
		none of the other answers is correct
		Fn2Hy
		Fn7Hy2

3 points   

QUESTION 21

1. Smileyum, with the symbol Sy, and frownium, with the symbol Fn, are fictitious nonmetal elements. What is the name for Sy₄Fn₃?

		tetrasmileyum trifrownide
		smileyum frownium
		smileyum(IV) frownium(III)
		smileyum(IV) frownide
		smileyum frownide

3 points   

QUESTION 22

1. Write the name and symbol for a fictitious element from your imagination. Make sure the symbol still follows the rules for element symbols.

23

1. Keeping in mind that the significant figures rules are different for addition and subtraction than they are for multiplication and division, how many significant figures are there in the calculated answer for 22.111 g - 21.015 g?

		5
		3
		10
		4
		2

3 points   

QUESTION 24

1. Which of the following exemplifies the octet rule? (All of the answers are true statements.)

		the ion that phosphorus usually forms is isoelectronic with argon
		a carbon atom has four single bonds in a covalent molecule
		aluminum forms an ion with a +3 charge
		bromine forms an ion with a -1 charge
		more than one answer is correct

3 points   

QUESTION 25

1. Smileyum and frownium are fictitious nonmetal elements. The electronegativity for smileyum is 2.0 and the electronegativity for frownium is 2.6. Which of the following describes a bond between the two elements?

		polar covalent, with the partially negative end at frownium
		more information is needed
		nonpolar covalent
		polar covalent, with the partially negative end at smileyum
		ionic

3 points   

QUESTION 26

1. Which answer shows the correct exponential notation for 0.051?

		more than one of these
		4.9x10-1
		49x104
		4.9x10-2
		49x10-3

3 points   

QUESTION 27

1. Happyium is a fictitious nonmetal element in group 17 of the periodic table. How many bonds is it most likely to have when it forms a covalent molecule?

		8
		17
		1
		7
		2

3 points   

QUESTION 28

1. The length of an object was measured to end at the arrow. Which of the following measured the object correctly?

 

 

		12.50 cm
		10.25 cm
		12.5 cm
		12.47cm
		12.475 cm

3 points   

QUESTION 29

1. Gigglyum is a fictitious element in group 13 of the periodic table. What is the last part of its electron configuration?

		none of these
		s5
		more information is needed
		s2p1
		p3

3 points   

QUESTION 30

1. A ³³Al atom has ____ neutrons, ___ protons, and ___electrons.

		13,20,13
		20,13,13
		20,13,27
		33,13,13
		33,27,13

3 points   

QUESTION 31

1. Grinium, with the symbol Gn, is a fictitious transition metal element. What is the charge on the grinium in GnP₂?

		3+
		5+
		6+
		5-
		10+

3 points   

QUESTION 32

1. Which combination of elements is most likely to combine to form an ionic compound?

		Na, K
		O, S
		C, I
		Lu, Hg
		Fr, F

3 points   

QUESTION 33

1. Approximately what is the formula mass of (NH₄)₂O?

		50 u
		34 u
		38 u
		52 u
		12 u

3 points   

QUESTION 34

1. Decimilli is an obsolete metric prefix that means 10^-4 and is abbreviated dm. How many µL are 9.8x10^-7 dmL?

		9.8x10-5 µL
		1.0x104 µL
		9.8x10-6 µL
		9.8x10-5 µL
		9.8x10-4 µL