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Home Q & A Board Biology-Related Homework Help Biochemistry
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When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the ...
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the ...
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the iron and the sulfur are not separated from one another. What type of material is this sample?
 a. a compound
  b. a homogeneous mixture
linasottile   34   1 Reply
6 years ago
In writing the equilibrium constant expression we use square brackets. The notation A means which of ...
In writing the equilibrium constant expression we use square brackets. The notation A means which of ...
In writing the equilibrium constant expression we use square brackets. The notation A means which of the following?
 a. the mass of A c. the molar concentration of A
  b. the number of moles of A d. none of the above
mahi   30   1 Reply
6 years ago
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the ...
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the ...
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the iron and the sulfur are separated from one another. What type of material is this sample?
 a. a compound
  b. a homogeneous mixture
 
ugai_kyut   33   1 Reply
6 years ago
Which of the following is true of a reaction which has reached equilibrium?
Which of the following is true of a reaction which has reached equilibrium?
Which of the following is true of a reaction which has reached equilibrium?
 a. The reactants have been completely converted to products.
  b. The rate of the forward reaction is faster than the rate of the reverse reaction.
  c. The
Linalovespickle   41   1 Reply
6 years ago
Zinc can be uniformly mixed in differing amounts in copper to an alloy called brass. Brass is an ...
Zinc can be uniformly mixed in differing amounts in copper to an alloy called brass. Brass is an ...
Zinc can be uniformly mixed in differing amounts in copper to an alloy called brass. Brass is an examples of which of the following?
 a. compounds c. homogeneous mixtures
  b. elements d. heterogeneous mixtures
omrglss   59   1 Reply
6 years ago
When a particular solid sample is examined under a microscope it is observed that there are regions ...
When a particular solid sample is examined under a microscope it is observed that there are regions ...
When a particular solid sample is examined under a microscope it is observed that there are regions which are black and regions which are yellow. What type of material is this sample?
 a. a compound c. a homogeneous mixture
  b. an element
Larrhea   50   1 Reply
6 years ago
Which of the following is true of a reversible reaction?
Which of the following is true of a reversible reaction?
Which of the following is true of a reversible reaction?
 a. Equilibrium can only be reached by mixing the starting materials.
  b. Equilibrium can only be reached by mixing the products.
  c. Equilibrium can only be reached by mixing
sophie0209   48   1 Reply
6 years ago
Which of the following statements describe a mixture?
Which of the following statements describe a mixture?
Which of the following statements describe a mixture?
 a. A mixture does not contain a fixed ratio by mass of the component elements.
  b. Chemical techniques are required to separate the components of a mixture.
  c. both a and b
jayfro   102   1 Reply
megabyte7
6 years ago
Which of the following statements is true about a reversible reaction?
Which of the following statements is true about a reversible reaction?
Which of the following statements is true about a reversible reaction?
 a. All reversible reactions are exothermic.
  b. All reversible reactions have low activation energy.
  c. When we mix the reactants together one or more of the r
adamsnaya   84   1 Reply
6 years ago
Which of the following statements describe a compound?
Which of the following statements describe a compound?
Which of the following statements describe a compound?
 a. A compound is a pure substance.
  b. A compound obeys the law of constant composition.
  c. both a and b
  d. neither a nor b
bdiddydog   64   1 Reply
6 years ago
Which of the following is not a proper symbol for an element?
Which of the following is not a proper symbol for an element?
Which of the following is not a proper symbol for an element?
 a. C c. CO
  b. Ca d. Co
lovelyturret   24   1 Reply
6 years ago
Drug manufacturers use which of the following when making time release drugs?
Drug manufacturers use which of the following when making time release drugs?
Drug manufacturers use which of the following when making time release drugs?
 a. control of the thickness of a drug coating
  b. control of the size
  c. both a and b
  d. neither a nor b
tarapratt95   33   1 Reply
6 years ago
Which of the following elements is named for a planet?
Which of the following elements is named for a planet?
Which of the following elements is named for a planet?
 a. As c. Pu
  b. Er d. V
hiufwsiuefbwe   34   1 Reply
6 years ago
Which of the following is true of fevers?
Which of the following is true of fevers?
Which of the following is true of fevers?
 a. An increase in body temperature never has beneficial effects.
  b. A 1C increase in temperature can be protective.
  c. A 3C increase in temperature is invariably fatal.
  d. None of
kristina92293   48   1 Reply
6 years ago
Which of the following elements is named for a person?
Which of the following elements is named for a person?
Which of the following elements is named for a person?
 a. Er c. Os
  b. Fr d. Sg
kristina92293   30   1 Reply
6 years ago
Which of the following elements is named for a city?
Which of the following elements is named for a city?
Which of the following elements is named for a city?
 a. B c. Bi
  b. Be d. Bk
ugai_kyut   34   1 Reply
6 years ago
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
 a. It increases the number of collisions between reacting molecules.
  b. It makes the reaction more endothermic.
  c. It makes the reaction more exother
Brooke.catlin   44   1 Reply
6 years ago
Which of the following elements is named for a country?
Which of the following elements is named for a country?
Which of the following elements is named for a country?
 a. Fr c. Po
  b. Ge d. all of them
sarah_verduzco1   34   1 Reply
6 years ago
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
A catalyst speeds up a chemical reaction as a result of which of the following?
 a. It provides an alternate pathway with a lower activation energy.
  b. It increases the number of collisions between reacting molecules.
  c. It makes
mahi   56   1 Reply
6 years ago
Which of the following elements is named for a continent?
Which of the following elements is named for a continent?
Which of the following elements is named for a continent?
 a. As c. Eu
  b. Au d. all of them
lovelyturret   32   1 Reply
6 years ago
The symbols for the elements in the period table are derived from three languages. Which of the ...
The symbols for the elements in the period table are derived from three languages. Which of the ...
The symbols for the elements in the period table are derived from three languages. Which of the following is not one of those languages?
 a. English c. German
  b. French d. Latin
alexiswells   42   1 Reply
6 years ago
Which of the following is the best definition of a catalyst?
Which of the following is the best definition of a catalyst?
Which of the following is the best definition of a catalyst?
 a. A catalyst is a material which speeds up the rate of a chemical reaction.
  b. A catalyst is a material which speeds up the rate of a chemical reaction without participating
yjuhen   60   1 Reply
6 years ago
Which of the following best compares Democritus' view of matter and our current view?
Which of the following best compares Democritus' view of matter and our current view?
Which of the following best compares Democritus' view of matter and our current view?
 a. both views are based on belief only
  b. both views are based on firm experimental evidence
  c. the ancient view was based on thought only, but
Jnortontruvisio   36   1 Reply
6 years ago
In a certain chemical reaction 1.00 gram of product is produced in 15 minutes when the reaction is ...
In a certain chemical reaction 1.00 gram of product is produced in 15 minutes when the reaction is ...
In a certain chemical reaction 1.00 gram of product is produced in 15 minutes when the reaction is carried out at 20C. Assuming that there is sufficient starting material available, about how much product will be produced in the same length of time i
Greenspotsock   78   1 Reply
6 years ago
The word atom is derived from a word in which language?
The word atom is derived from a word in which language?
The word atom is derived from a word in which language?
 a. Arabic c. Hebrew
  b. Greek d. Latin
mdlc0516   68   1 Reply
6 years ago
Which Greek philosopher thought that matter was infinitely divisible?
Which Greek philosopher thought that matter was infinitely divisible?
Which Greek philosopher thought that matter was infinitely divisible?
 a. Aristotle c. Plato
  b. Democritus d. Zeno
jayfro   31   1 Reply
6 years ago
A particular chemical reaction carried out at 20C takes 2 hours. Approximately how long will it take ...
A particular chemical reaction carried out at 20C takes 2 hours. Approximately how long will it take ...
A particular chemical reaction carried out at 20C takes 2 hours. Approximately how long will it take to carry out the reaction at 40C?
 a. 0.5 hour c. 4 hours
  b. 1 hour d. 8 hours
lacinb30   33   1 Reply
6 years ago
The name of which Greek philosopher is most closely associated with the concept of an atom?
The name of which Greek philosopher is most closely associated with the concept of an atom?
The name of which Greek philosopher is most closely associated with the concept of an atom?
 a. Aristotle c. Plato
  b. Democritus d. Zeno
Miller123   39   1 Reply
6 years ago
The temperature effect on reaction rate is the result of which of the following?
The temperature effect on reaction rate is the result of which of the following?
The temperature effect on reaction rate is the result of which of the following?
 a. At higher temperatures there are more collisions.
  b. At higher temperatures a larger fraction of the collisions are effective collisions.
  c. both
jayfro   48   1 Reply
6 years ago
A student discussing bond polarity and molecular polarity in alcohols made the following statements: ...
A student discussing bond polarity and molecular polarity in alcohols made the following statements: ...
A student discussing bond polarity and molecular polarity in alcohols made the following statements: (i) In methanol, CH3OH the HO bond is more polar than the CO bond. (ii) Ethanol, CH3CH2OH, the alcohol of alcoholic beverages, has at least one polar
ksultz   138   1 Reply
6 years ago
What is the effect of decreasing the temperature at which a reaction is carried out?
What is the effect of decreasing the temperature at which a reaction is carried out?
What is the effect of decreasing the temperature at which a reaction is carried out?
 a. In all cases the rate of reaction decreases.
  b. In virtually all cases the rate of reaction decreases.
  c. In all cases the rate of reaction i
hawkins1346   34   1 Reply
6 years ago
Which of the following is true about a molecule which contains two polar bonds which have the ...
Which of the following is true about a molecule which contains two polar bonds which have the ...
Which of the following is true about a molecule which contains two polar bonds which have the different degrees of polarity?
 a. It will always be polar.
  b. It will never be polar.
  c. It will only be polar if it is bent.
  d.
alexiswells   28   1 Reply
6 years ago
What is the effect of increasing the temperature at which a reaction is carried out?
What is the effect of increasing the temperature at which a reaction is carried out?
What is the effect of increasing the temperature at which a reaction is carried out?
 a. In all cases the rate of reaction decreases.
  b. In virtually all cases the rate of reaction decreases.
  c. In all cases the rate of reaction i
jennjenn563   37   1 Reply
6 years ago
Which of the following is true about a molecule which contains two polar bonds which have the same ...
Which of the following is true about a molecule which contains two polar bonds which have the same ...
Which of the following is true about a molecule which contains two polar bonds which have the same degree of polarity?
 a. It will always be polar.
  b. It will never be polar.
  c. It will only be polar if it is bent.
  d. It wi
Pooh bear   31   1 Reply
6 years ago
If a particular reactant is involved in the slowest step of a multi-step reaction what will be the ...
If a particular reactant is involved in the slowest step of a multi-step reaction what will be the ...
If a particular reactant is involved in the slowest step of a multi-step reaction what will be the effect of increasing its concentration?
 a. The reaction rate will decrease.
  b. The reaction rate will increase.
  c. The reaction ra
hawkins1346   67   1 Reply
6 years ago
Which of the following is true about a molecule which contains three polar bonds each of which have ...
Which of the following is true about a molecule which contains three polar bonds each of which have ...
Which of the following is true about a molecule which contains three polar bonds each of which have the same degree of polarity?
 a. The molecule will always be polar.
  b. The molecule will never be polar.
  c. The molecule will be p
Pooh bear   26   1 Reply
6 years ago
Which of the following is true about a molecule which contains three polar bonds which have the same ...
Which of the following is true about a molecule which contains three polar bonds which have the same ...
Which of the following is true about a molecule which contains three polar bonds which have the same degree of polarity?
 a. The molecule will always be polar.
  b. The molecule will never be polar.
  c. The molecule will be polar if
alshernandez   21   1 Reply
6 years ago
When the concentration of a reactant is increased which of the following is true?
When the concentration of a reactant is increased which of the following is true?
When the concentration of a reactant is increased which of the following is true?
 a. The rate of reaction always decreases.
  b. The rate of reaction usually decreases.
  c. The rate of reaction always increases.
  d. The rate o
MB0727   30   1 Reply
6 years ago
Which of the following is true for the molecule O=C=S?
Which of the following is true for the molecule O=C=S?
Which of the following is true for the molecule O=C=S?
 a. O=C=S is nonpolar because it contains only double bonds.
  b. O=C=S is nonpolar because it is linear.
  c. O=C=S is polar because it has a bent shape.
  d. O=C=S is polar
avaaaaa   34   1 Reply
6 years ago
Which of the following does not result from increasing the temperature of a reaction?
Which of the following does not result from increasing the temperature of a reaction?
Which of the following does not result from increasing the temperature of a reaction?
 a. A larger fraction of the collisions are effective collisions.
  b. The concentrations of the reactants are increased.
  c. There are more collis
Abessesen   44   1 Reply
6 years ago
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