Laser_3

Suppose you ran this same reaction (using the balloon setup as seen in the video) on your own with t

Suppose you ran this same reaction (using the balloon setup as seen in the video) on your own with t

(f) (4 pts) Suppose you ran this same reaction (using the balloon setup as seen in the video) on your own with two different flasks. In Flask A, you reacted 5.10 g Mg with 0.447 mol HCl. In Flask B, you reacted 24.21 g Mg with 0.998 mol HCl. Which ba

cmgbs03   1586   7 Replies

regulate717

What is the balanced reduction half-reaction for the following unbalanced redox

What is the balanced reduction half-reaction for the following unbalanced redox

What is the balanced reduction half-reaction for the following unbalanced redox reaction: 
A) Ca   + 2
B)    Ag + 1
C) 2  + Ca  
D)   + 2 2Ag
E) none of the above

Think   427   1 Reply

juicybear23

What is the value of 98 °F in units of °C?

What is the value of 98 °F in units of °C?

What is the value of 98 °F in units of °C?
A) 72
B) 37
C) 371
D) 22
E) none of the above

Think   586   1 Reply

zack

Suggest two methods to reduce corrosion of a metal such as iron and briefly expl

Suggest two methods to reduce corrosion of a metal such as iron and briefly expl

Suggest two methods to reduce corrosion of a metal such as iron and briefly explain how each method works.

Think   522   1 Reply

mel!811

Radioactive elements are used for:

Radioactive elements are used for:

Radioactive elements are used for:
A) medical diagnosis.
B) medical treatment.
C) determining age of fossils and rocks.
D) generating electricity.
E) all of the above

Think   512   1 Reply

mel!811

Who discovered radioactivity? (Multiple Choice)

Who discovered radioactivity? (Multiple Choice)

Who discovered radioactivity?
A) Antoine Becquerel
B) Pierre Curie
C) Marie Curie
D) Ernest Rutherford
E) Benjamin Franklin

Think   328   1 Reply

mel!811

How was radioactivity discovered? (Multiple Choice)

How was radioactivity discovered? (Multiple Choice)

How was radioactivity discovered?
A) Rutherford was investigating the structure of Au atoms and discovered alpha particles.
B) Marie Curie was investigating the existence of uranic rays that occurred in some minerals.
C) Becquerel was

Think   302   1 Reply

mel!811

During the career of Marie Curie, she:

During the career of Marie Curie, she:

During the career of Marie Curie, she:
A) won a Nobel prize in chemistry.
B) won a Nobel prize in physics.
C) discovered the element polonium.
D) discovered the element radium.
E) all of the above

Think   409   1 Reply

mel!811

Which of the following isotopes contains the most number of neutrons?

Which of the following isotopes contains the most number of neutrons?

Which of the following isotopes contains the most number of neutrons?
A)  Rn
B)  Bi
C)  Fr
D)  Po
E)  Rn

Think   354   1 Reply

mel!811

How many protons and neutrons are in S?

How many protons and neutrons are in S?

How many protons and neutrons are in  S?
A) 16 p and 34 n
B) 16 n and 34 p
C) 16 n and 18 p
D) 16 p and 18 n
E) none of the above

Think   213   1 Reply

mel!811

Radiation therapy involves: (Multiple Choice)

Radiation therapy involves: (Multiple Choice)

Radiation therapy involves:
A) radioactive isotopes that are used in place of x-rays.
B) radioactive isotopes that are absorbed by specific organs.
C) destroying cancerous cells by intense radiation levels.
D) acute radiation expo

Think   504   1 Reply

mel!811

How many protons and neutrons are in Sn?

How many protons and neutrons are in Sn?

How many protons and neutrons are in  Sn?
A) 50 p and 169 n
B) 50 n and 69 p
C) 50 n and 119 p
D) 50 p and 69 n
E) none of the above

Think   223   1 Reply

mel!811

How many protons and neutrons are in U?

How many protons and neutrons are in U?

How many protons and neutrons are in  U?
A) 92 p and 235 n
B) 92 n and 235 p
C) 92 n and 143 p
D) 92 p and 143 n
E) none of the above

Think   162   1 Reply

mel!811

Which of the following statements about beta particles is FALSE?

Which of the following statements about beta particles is FALSE?

Which of the following statements about beta particles is FALSE?
A) The symbol is:  e.
B) Beta particles are created when neutrons become protons and electrons.
C) They have intermediate ionizing power.
D) They have intermedi

Think   528   1 Reply

mel!811

In a nuclear equation: (Multiple Choice)

In a nuclear equation: (Multiple Choice)

In a nuclear equation:
A) the daughter nuclide appears on the right-side of the arrow.
B) the sum of the atomic numbers on both sides must be equal.
C) the sum of the mass numbers on both sides must be equal.
D) all of the above

Think   704   1 Reply

mel!811

Suppose a Po daughter nuclide was obtained after the alpha decay of a parent nu

Suppose a Po daughter nuclide was obtained after the alpha decay of a parent nu

Suppose a  Po daughter nuclide was obtained after the alpha decay of a parent nuclide. The symbol of the original parent element is:
A) Po
B) Pb
C) Ra
D) Rn
E) none of the above

Think   368   1 Reply

mel!811

When Th undergoes alpha decay, what is the atomic mass of the element that is p

When Th undergoes alpha decay, what is the atomic mass of the element that is p

When  Th undergoes alpha decay, what is the atomic mass of the element that is produced?
A) 88
B) 228
C) 236
D) 92
E) none of the above

Think   299   1 Reply

mel!811

When Ac undergoes positron emission, what is the atomic number of the element t

When Ac undergoes positron emission, what is the atomic number of the element t

When  Ac undergoes positron emission, what is the atomic number of the element that is produced?
A) 87
B) 90
C) 88
D) 91
E) none of the above

Think   620   1 Reply

mel!811

When Ac undergoes beta decay, what is the atomic number of the element that is

When Ac undergoes beta decay, what is the atomic number of the element that is

When  Ac undergoes beta decay, what is the atomic number of the element that is produced?
A) 87
B) 90
C) 88
D) 91
E) none of the above

Think   359   1 Reply

mel!811

A 3.6 mole sample of Co-60 has a half-life of 5.2 years. How many moles of Co is

A 3.6 mole sample of Co-60 has a half-life of 5.2 years. How many moles of Co is

A 3.6 mole sample of Co-60 has a half-life of 5.2 years. How many moles of Co is left after 
A) 0.056
B) 0.11
C) 0.23
D) 0
E) none of the above

Think   1003   1 Reply

mel!811

A C-14 dating experiment revealed that an artifact had 50.0% of the activity of

A C-14 dating experiment revealed that an artifact had 50.0% of the activity of

A C-14 dating experiment revealed that an artifact had 50.0% of the activity of a modern organism. Given the half-life of C-14 is 5730 years, approximately how old is the artifact?
A) 28,650
B) 34,380
C) 22,920
D) 5,730
E) no

Think   1156   1 Reply

mel!811

Briefly describe the main features of the three types of radiation: alpha, beta,

Briefly describe the main features of the three types of radiation: alpha, beta,

Briefly describe the main features of the three types of radiation: alpha, beta, and gamma. Also explain what happens to the nucleus of an atom when it is exposed to each of these.

Think   251   1 Reply

mel!811

Briefly distinguish between nuclear fission and nuclear fusion.

Briefly distinguish between nuclear fission and nuclear fusion.

Briefly distinguish between nuclear fission and nuclear fusion.

Think   394   1 Reply

mel!811

What chemical reaction was used by the German chemist Friedrich Wohler to synthe

What chemical reaction was used by the German chemist Friedrich Wohler to synthe

What chemical reaction was used by the German chemist Friedrich Wohler to synthesize urea for the first time?
A) evaporating urine
B) heating ammonium cyanate
C) heating ammonium cyanide
D) combining the elements carbon, hydrogen,

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mel!811

Which of the following statements about carbon is FALSE?

Which of the following statements about carbon is FALSE?

Which of the following statements about carbon is FALSE?
A) Carbon must always have four bonds.
B) Carbon can bond to itself.
C) Carbon can have either a tetrahedral, trigonal planar or linear geometry.
D) Carbon can form into lin

Think   251   1 Reply

mel!811

What will be the molecular geometry of an open-chain noncyclical hydrocarbon wit

What will be the molecular geometry of an open-chain noncyclical hydrocarbon wit

What will be the molecular geometry of an open-chain noncyclical hydrocarbon with the generic molecular formula CnH2n-2?
A) linear
B) tetrahedral
C) trigonal planar
D) trigonal pyramidal
E) none of the above

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mel!811

What is the molecular geometry of the underlined carbon atom in the following co

What is the molecular geometry of the underlined carbon atom in the following co

What is the molecular geometry of the underlined carbon atom in the following compound,  ?
A) tetrahedral
B) trigonal planar
C) linear
D) bent
E) none of the above

Think   554   1 Reply

mel!811

Based on the molecular formulas shown below, which compound shown below could be

Based on the molecular formulas shown below, which compound shown below could be

Based on the molecular formulas shown below, which compound shown below could be classified as a cyclical alkane?
A) C4H10
B) C3H8
C) C5H12
D) C12H24
E) C9H20

Think   521   1 Reply

mel!811

Compare a six-carbon open-chain (noncyclic) hydrocarbon alkane, alkene, and alky

Compare a six-carbon open-chain (noncyclic) hydrocarbon alkane, alkene, and alky

Compare a six-carbon open-chain (noncyclic) hydrocarbon alkane, alkene, and alkyne. Which of these compounds would have the fewest number of hydrogen atoms?
A) the alkane
B) the alkyne
C) the alkene
D) all of these have the same n

Think   1233   1 Reply

mel!811

Hydrocarbons are commonly used for:

Hydrocarbons are commonly used for:

Hydrocarbons are commonly used for:
A) fuel.
B) wax.
C) fabrics.
D) plastics.
E) all of the above

Think   406   1 Reply

mel!811

Which type of hydrocarbon is classified as being saturated?

Which type of hydrocarbon is classified as being saturated?

Which type of hydrocarbon is classified as being saturated?
A) alkanes
B) alkenes
C) alkynes
D) all of these
E) none of the above

Think   486   1 Reply

mel!811

Consider the following n-alkanes: CH4, C2H6, C3H8, C4H10 Which of these would yo

Consider the following n-alkanes: CH4, C2H6, C3H8, C4H10 Which of these would yo

Consider the following n-alkanes: CH4, C2H6, C3H8, C4H10
Which of these would you expect to have the highest boiling point?
A) CH4
B) C2H6
C) C3H8
D) C4H10
E) all n-alkanes have the same boiling point

Think   615   1 Reply

mel!811

Which is the name of ?

Which is the name of ?

Which is the name of   ?
A) n-butane
B) n-hexane
C) n-heptane
D) n-pentane
E) all of the above

Think   258   1 Reply

mel!811

A straight chain saturated hydrocarbon has eight carbon atoms. Its molecular for

A straight chain saturated hydrocarbon has eight carbon atoms. Its molecular for

A straight chain saturated hydrocarbon has eight carbon atoms. Its molecular formula is:
A) C8H14.
B) C8H16.
C) C8H18.
D) C8H24.
E) none of the above

Think   610   1 Reply

mel!811

Which of the following is not a proper condensed structural formula for a normal

Which of the following is not a proper condensed structural formula for a normal

Which of the following is not a proper condensed structural formula for a normal alkane?
A) CH3CH2CH2CH3
B) CH2CH3CH3
C) CH3CH2CH2CH2CH3
D) CH3CH3
E) none of the above

Think   546   1 Reply

mel!811

Which of the following structural formulas is an isomer to n-hexane?

Which of the following structural formulas is an isomer to n-hexane?

Which of the following structural formulas is an isomer to n-hexane?
A) C— C— C— C— — C
B) C— — C— C— — C
C) C— —  C— — C
D)  —  C— — C
E) none of the above

Think   493   1 Reply

mel!811

Two compounds are considered as isomers if they have the:

Two compounds are considered as isomers if they have the:

Two compounds are considered as isomers if they have the:
A) same molecular formula AND different structure.
B) same molecular formula AND same structure.
C) different molecular formula AND different structure.
D) different molec

Think   798   1 Reply

mel!811

How many isomers exist for the alkane whose molecular formula is C4H10?

How many isomers exist for the alkane whose molecular formula is C4H10?

How many isomers exist for the alkane whose molecular formula is C4H10?
A) 1
B) 2
C) 3
D) 4
E) none

Think   832   1 Reply

mel!811

Which of the following structural formulas is an isomer to n-nonane?

Which of the following structural formulas is an isomer to n-nonane?

Which of the following structural formulas is an isomer to n-nonane?
A) C— C— C— C— — C
B) C— — C— — C — — C
C) C— —  C— — C— C
D)  —  C— — C— C— C
E) none of the above

Think   411   1 Reply

mel!811

The prefix "but-" means that the base chain contains how many carbon atoms?

The prefix "but-" means that the base chain contains how many carbon atoms?

The prefix "but-" means that the base chain contains how many carbon atoms?
A) 2
B) 4
C) 6
D) 8
E) all of the above

Think   464   1 Reply

mel!811