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Dafna11 [192]
4 years ago
6

What is an enzyme? Please help.

Chemistry
2 answers:
poizon [28]4 years ago
8 0
An enzyme is a catalyst that helps speed up a chemical reaction.
uranmaximum [27]4 years ago
8 0
Enzymes are molecules that act as a catalyst

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What are the equilibrium concentrations of pb2+ and f– in a saturated solution of lead(ii) fluoride if the ksp of pbf2 is 3.20×1
erica [24]
Answer is:  the equilibrium concentrations fluorine anion are 0.004 M and lead cation are 0.002 M.<span>
Chemical reaction: PbF</span>₂(aq) → Pb²⁺(aq) + 2F⁻(aq).<span>
Ksp = 3,2·10</span>⁻⁸.
[Pb²⁺] = x.
[F⁻] = 2[Pb²⁺] = 2x<span>
Ksp = [Pb²</span>⁺] · [F⁻]².
Ksp = x · 4x².
3,2·10⁻⁸ = 4x³.
x = ∛3,2·10⁻⁸ ÷ 4.
x = [Pb²⁺] = 0,002M = 2·10⁻³ M.
[F⁻] = 2 · 0,002M = 0,004 M = 4·10⁻³ M.

6 0
3 years ago
Read 2 more answers
Hot magma may:
Oksana_A [137]

Answer:

it is d

Explanation:

because if hot magma is hot wonts it is cold down it actly forms it self

5 0
4 years ago
Read 2 more answers
How much eneregy is released when 10.0 g of methanol is burned?
MAVERICK [17]
Well the first thing you need to know is how much energy that 1g methanol release which is fixed value

Methanol CHOH is 17000 j/g
so the energy released when 10.0g of methanol is burned
=10x 17000
=170000 j
8 0
3 years ago
Camphor is a ketone compound and is one of the active ingredients in vicks products. if camphor has m+ = 152 and contains 1 doub
nordsb [41]

Answer:

           C₁₀H₁₆O

Explanation:

                   Molecular formula can be determined from parent peak by using rule of thirteen.

Rule of Thirteen:

First divide the parent peak value by 13 as,

                 = 152 ÷ 13

                 = 11.69

Now, multiply 13 by 11,

                 = 13 × 11 (here, 11 specifies number of carbon atoms)

                 = 143

Now subtract 143 from 152,

                 = 152 - 143

                 = 9

Add 9 into 11,

                 = 9 + 11

                 = 20 (hydrogen atoms)

So, the rough formula we have is,

                                                        C₁₁H₂₀

Now, add one Oxygen atom to above formula and subtract one Carbon and 4 Hydrogen atoms as these numbers are equal to atomic mass of Oxygen atom as,

                 C₁₁H₂₀   -------O-------->    C₁₀H₁₆O

Calculate Hydrogen deficiency index as,

                 HDI  =  (2x + 2 - y) / 2

where,

x = C atoms

y = H atoms

                 HDI  =  [2(10) + 2 - 16] / 2

                 HDI  =  (20 + 2 - 16) / 2

                 HDI  =  (22-16) / 2

                 HDI  =  6 / 2

                 HDI  =  3

It means, Camphor contains 1 double bond and two rings. As, HDI of double bond is 1 and HDI of one ring is 1.

7 0
4 years ago
What two types of evidence are used to classify organisms
Shalnov [3]
The two types of evidence are used to classify organisms are micro and organic
8 0
4 years ago
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