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What is the coefficient of hydrogen, H2, when the following equation is balanced? Al + H2SO4 ...
What is the coefficient of hydrogen, H2, when the following equation is balanced? Al + H2SO4 ...
[html]What is the coefficient of hydrogen, H2, when the following equation is balanced?

 Al + H2SO4 → Al2(SO4) 3 +
cjulia8   74   1 Reply
2 years ago
What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 ...
What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 ...
[html]What coefficient is placed in front of O2 to complete the balancing of the following equation?

 C5H8 + ? O2 → 5CO2 + 4H
ninsta2700   60   1 Reply
2 years ago
Which of the following correctly gives the correct coefficients for the reaction below? N2H4 + H2O2 N2 + H2O
Which of the following correctly gives the correct coefficients for the reaction below? N2H4 + H2O2 N2 + H2O
[html]Which of the following correctly gives the correct coefficients for the reaction below?

 N2H4 + H2O2 → N2 + H2
123456789ABCD   79   1 Reply
2 years ago
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?

▸ 50.7 g

▸ 640. g

▸ 103 g

▸ 180. g

▸ 426 g
dewsae   82   1 Reply
2 years ago
How many grams of Fe2O3 are there in 0.500 mole of Fe2O3?
How many grams of Fe2O3 are there in 0.500 mole of Fe2O3?
How many grams of Fe2O3 are there in 0.500 mole of Fe2O3?

▸ 160. g

▸ 51.9 g

▸ 79.9 g

▸ 63.8 g

▸ 35.9 g
benjaminl12998   61   1 Reply
2 years ago
What is the molar mass of sodium phosphate, Na3PO4?
What is the molar mass of sodium phosphate, Na3PO4?
What is the molar mass of sodium phosphate, Na3PO4?

▸ 354.0 g/mole

▸ 163.9 g/mole

▸ 69.96 g/mole

▸ 118.0 g/mole

▸ 226.1 g/mole
19sspeck   81   1 Reply
2 years ago
How many moles of carbon atoms are there in 0.500 mole of C2H6?
How many moles of carbon atoms are there in 0.500 mole of C2H6?
How many moles of carbon atoms are there in 0.500 mole of C2H6?

▸ 4.00 moles

▸ 1.00 mole

▸ 0.500 mole

▸ 6.02 × 1023 moles

▸ 3.00 moles
ARIA Beru   70   1 Reply
2 years ago
The molecule CO2 is linear.
The molecule CO2 is linear.
The molecule CO2 is linear.

▸ true

▸ false
Cory Yeung   41   1 Reply
2 years ago
When calcium and oxygen combine, the formula of the product is CaO.
When calcium and oxygen combine, the formula of the product is CaO.
When calcium and oxygen combine, the formula of the product is CaO.

▸ true

▸ false
arlinguillen   40   1 Reply
2 years ago
A sulfur atom gains electrons to form an ion with a charge of 2-.
A sulfur atom gains electrons to form an ion with a charge of 2-.
A sulfur atom gains electrons to form an ion with a charge of 2-.

▸ true

▸ false
karlec   38   1 Reply
2 years ago
Identify each of the following compounds as covalent or ionic.sodium fluoride
Identify each of the following compounds as covalent or ionic.sodium fluoride
Identify each of the following compounds as covalent or ionic.


sodium fluoride
Mario   46   1 Reply
2 years ago
The shape of a molecule with a central atom that has two bonded atoms and one lone pair is ________.
The shape of a molecule with a central atom that has two bonded atoms and one lone pair is ________.
The shape of a molecule with a central atom that has two bonded atoms and one lone pair is ________.

▸ bent (109°)

▸ linear

▸ trigonal pyramidal

▸ bent (120°)

▸ trigonal planar
19sspeck   61   1 Reply
2 years ago
Which of the following substances contains a nonpolar covalent bond?
Which of the following substances contains a nonpolar covalent bond?
Which of the following substances contains a nonpolar covalent bond?

▸ N2

▸ MgF2

▸ H2O

▸ NaCl

▸ NH3
yashreds   43   1 Reply
2 years ago
Nuclear fission as used in nuclear power plants produces radioactive waste with long half-lives.
Nuclear fission as used in nuclear power plants produces radioactive waste with long half-lives.
Nuclear fission as used in nuclear power plants produces radioactive waste with long half-lives.

▸ true

▸ false
heberleber   70   1 Reply
2 years ago
CT scans are based on the adsorption of X-rays.
CT scans are based on the adsorption of X-rays.
CT scans are based on the adsorption of X-rays.

▸ true

▸ false
yan900906   43   1 Reply
Guest
2 years ago
The amount of radiation measured by 1 Bq is larger than that measured by 1 Ci.
The amount of radiation measured by 1 Bq is larger than that measured by 1 Ci.
The amount of radiation measured by 1 Bq is larger than that measured by 1 Ci.

▸ true

▸ false
MMORPGnurse   45   1 Reply
2 years ago
The combination of H-3 and H-2 to give He-4 and a neutron is called nuclear ________.
The combination of H-3 and H-2 to give He-4 and a neutron is called nuclear ________.
The combination of H-3 and H-2 to give He-4 and a neutron is called nuclear ________.
Norris Day   29   1 Reply
2 years ago
The splitting of a large nucleus into smaller nuclei is called nuclear ________.
The splitting of a large nucleus into smaller nuclei is called nuclear ________.
The splitting of a large nucleus into smaller nuclei is called nuclear ________.
Jaysguy   29   1 Reply
2 years ago
The diagnostic imaging technique that depends on magnetic fields and radio waves, not radioactivity, ...
The diagnostic imaging technique that depends on magnetic fields and radio waves, not radioactivity, ...
The diagnostic imaging technique that depends on magnetic fields and radio waves, not radioactivity, is called ________.
jdiaz197   45   1 Reply
2 years ago
A sample of I-131 decays from 12 microcuries to 3.0 microcuries in 16 days. What is the half-life of I-131?
A sample of I-131 decays from 12 microcuries to 3.0 microcuries in 16 days. What is the half-life of I-131?
A sample of I-131 decays from 12 microcuries to 3.0 microcuries in 16 days. What is the half-life of I-131?

▸ 32 days

▸ 8.0 days

▸ 16 days

▸ 4.0 days

▸ 64 days
Aries   62   1 Reply
2 years ago
Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 mCi. What is ...
Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 mCi. What is ...
Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 mCi. What is the activity after 24 days?

▸ 96 mCi

▸ 8.0 mCi

▸ 16. mCi

▸ 2.0 mCi

▸ 4.0 mCi
Devaughan   82   1 Reply
2 years ago
A double covalent bond involves the sharing of two pairs of electrons.Pick whether it's true or ...
A double covalent bond involves the sharing of two pairs of electrons.Pick whether it's true or ...
A double covalent bond involves the sharing of two pairs of electrons.
Pick whether it's true or false...
Neves   121   3 Replies
2 years ago
The metallic character of elements ________.
The metallic character of elements ________.
The metallic character of elements ________.

▸ decreases going across a period

▸ increases going across a period

▸ does not change going down within a group

▸ decreases going down within a group

▸ none of the above
Cory Yeung   73   1 Reply
2 years ago
The metallic character of elements ________.
The metallic character of elements ________.
The metallic character of elements ________.

▸ increases going down within a group

▸ does not change going down within a group

▸ increases going across a period

▸ decreases going down within a group

▸ none of the above
scovarrubias   63   1 Reply
2 years ago
Ionization energy is ________.
Ionization energy is ________.
[html]Ionization energy is ________.

▸ higher for potassium than for lithium

▸ the energy an ion acquires from an electron

▸ the energy needed to remove the least tightly bound electron

▸ highest for metals in Group 1A (1)

▸ none of the above[/h
Sejunmam   54   1 Reply
Guest
2 years ago
The ionization energy of atoms ________.
The ionization energy of atoms ________.
The ionization energy of atoms ________.

▸ does not change going down within a group

▸ decreases going down within a group

▸ increases going down within a group

▸ decreases going across a period

▸ none of the above
mullenh232   64   1 Reply
2 years ago
The atomic size of atoms ________.
The atomic size of atoms ________.
The atomic size of atoms ________.

▸ increases going across a period

▸ does not change going down within a group

▸ decreases going down within a group

▸ increases going down within a group

▸ none of the above
lii   54   1 Reply
2 years ago
The number of dots in the electron dot symbol of carbon is ________.
The number of dots in the electron dot symbol of carbon is ________.
The number of dots in the electron dot symbol of carbon is ________.

▸ one

▸ two

▸ three

▸ four

▸ five
FoxxFire_   65   1 Reply
2 years ago
The number of dots in the electron dot symbol of nitrogen is ________.
The number of dots in the electron dot symbol of nitrogen is ________.
The number of dots in the electron dot symbol of nitrogen is ________.

▸ one

▸ two

▸ three

▸ four

▸ five
writingprof12   64   1 Reply
2 years ago
How many valence electrons are in the electron-dot symbols for the elements in group 3A (13)?
How many valence electrons are in the electron-dot symbols for the elements in group 3A (13)?
How many valence electrons are in the electron-dot symbols for the elements in group 3A (13)?

▸ 1

▸ 4

▸ 3

▸ 6

▸ 2
Najah   66   1 Reply
2 years ago
In an electron-dot symbol of an element, the dots are used to represent ________.
In an electron-dot symbol of an element, the dots are used to represent ________.
[html]In an electron-dot symbol of an element, the dots are used to represent ________.

▸ only the electrons that will participate in bond formation

▸ the electron arrangement

▸ the valence electrons

▸ the electrons that the element will gain whe
maryberryhermee   74   1 Reply
2 years ago
Valence electrons are electrons located ________.
Valence electrons are electrons located ________.
Valence electrons are electrons located ________.

▸ in the nucleus of an atom

▸ throughout the atom

▸ in the first three shells of an atom

▸ in the outermost energy level of an atom

▸ in the innermost energy level of an atom
Fluckey   62   1 Reply
2 years ago
The number of valence electrons found in an atom of a Group A element is equal to ________.
The number of valence electrons found in an atom of a Group A element is equal to ________.
The number of valence electrons found in an atom of a Group A element is equal to ________.

▸ eight minus the group number

▸ its mass number

▸ eight

▸ its group number

▸ its atomic number
jackiezhou   79   1 Reply
2 years ago
What element has the electron arrangement 2,8,4?
What element has the electron arrangement 2,8,4?
What element has the electron arrangement 2,8,4?

▸ iron

▸ oxygen

▸ carbon

▸ silicon

▸ sulfur
darlinlady95   64   1 Reply
2 years ago
What is the electron arrangement for aluminum?
What is the electron arrangement for aluminum?
What is the electron arrangement for aluminum?

▸ 2,8,8

▸ 2,8,3

▸ 2,8,10

▸ 2,8,5

▸ 2,8,7
sxllykxm   117   1 Reply
2 years ago
What is the element with the electron arrangement 2,8,7?
What is the element with the electron arrangement 2,8,7?
What is the element with the electron arrangement 2,8,7?

▸ S

▸ Ar

▸ F

▸ Cl

▸ Be
Znick   65   1 Reply
2 years ago
A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 makes up 75.8% of the ...
A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 makes up 75.8% of the ...
[html]A sample of chlorine has two naturally occurring isotopes.  The isotope Cl-35 makes up 75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample.  Which of the following statements is true?

▸ The atomic mass of chlorine will be l
queenmeg   99   1 Reply
2 years ago
Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of ...
Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of ...
Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is ________.

▸ 14

▸ 11

▸ 16

▸ 25

▸ 32
khayes1   84   1 Reply
2 years ago
How many protons are in an isotope of sodium with a mass number of 25?
How many protons are in an isotope of sodium with a mass number of 25?
How many protons are in an isotope of sodium with a mass number of 25?

▸ 11

▸ 25

▸ 32

▸ 15

▸ 14
sam_48   72   1 Reply
2 years ago
Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is ________.
Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is ________.
Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is ________.

▸ 30

▸ 32

▸ 34

▸ 64

▸ 94
desiree_n   104   1 Reply
2 years ago
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