Biology, 04.07.2019 13:30 torrencek1

Iron reacts with atmospheric oxygen to form iron oxide or ferric oxide. look at the chemical equation for this reaction: fe + o2 → fe2o3 this equation is unbalanced. which of the following is the correct balanced equation for this reaction? a. 4fe + 3o2 → 2fe2o3 b. 3fe + 4o2 → 2fe2o3 c. 2fe + 4o2 → 3fe2o3 d. 3fe + 3o2 → 4fe2o3 e. 4fe + 4o2 → 3fe2o3

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Answer from: danniuhrig

ANSWER

The correct answer is A

EXPLANATION

From the equation $Fe + O_2 \rightarrow Fe_2O_3$

L.H.S.

Fe = 1

O =2

R.H.S

Fe =2

O =3

Now, let try to balance the oxygen atoms first,

To do this, we know the Least Common Multiples of 2 and 3 is 6

To get 6 atoms of oxygen at L.H.S multiply 2 by 3 and on the R.H.S, multiply 3 by 2

L.H.S.

$O=2\times3=6$

R.H.S

$O=3\times2=6$

This means that, 3 should be in front of O_2 at the L.H.S and 2 should come before Fe_2O_3 in the R.H.S of the equation

Now, we have

L.H.S.

Fe = 1

O = 6

R.H.S

Fe =4

O =6

The equation is still not balanced since Fe is not balance

The Least Common Multiple of 1 and 4 is 4

Which means that we need to multiply 1 by 4 at the L.H.S and 4 by 1 at the R.H.S

L.H.S.

$Fe=1\times4=4$

R.H.S

$Fe=4\times1=4$

We now, have

L.H.S.

Fe= 4

O=6

R.H.S

Fe =4

O=6

Hence the balanced equation is

$4Fe +3O_2\rightarrow 2Fe_2O_3$

Answer from: Quest

The correct answer is: making up measurement to record

Answer from: Quest

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

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Iron reacts with atmospheric oxygen to form iron oxide or ferric oxide. look at the chemical equatio...