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juin [17]
3 years ago
9

4. Describe in detail the relationship between chemical bonds and energy. What must be true of the bonds for a reaction to be en

dothermic, and what must be true for the reaction to be exothermic?
Chemistry
1 answer:
tamaranim1 [39]3 years ago
7 0
When a bond is formed, the energy is released. Also, it must be supplied when the bond is broken.
In an endothermic reaction, the energy required to break the bond in the reactants must be greater than the energy released forming the bond in the product.
In an exothermic reaction more energy is released in forming  the bonds on the product than is absorbed to break the bonds in the reactants.
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I cant remember my mass, grams, and volume. and how to divide density
Bas_tet [7]
Mass divide by volume

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7 0
2 years ago
Hemoglobin (Hb) can be viewed as having two quaternary states, a low oxygen affinity state (T), and a high oxygen affinity state
natta225 [31]
<h3><u>Answer;</u></h3>

The statements that are True are;

  • Upon binding a molecule of oxygen, Hb undergoes a conformational change that makes the binding of subsequent O2 molecules easier.
  • The conformational change induced in Hb upon binding oxygen is the result of a small movement (0.2 Å) of the iron cation in the center of heme.
  • Site-directed mutagenesis studies have indicated that the cooperativity of O2 binding in Hb is attributable to the movement of the F helix in Hb.
<h3><u>Explanation</u>;</h3>
  • Hemoglobin is a key pigment in the blood that transports oxygen gas to all the tissues in the body. It is made up of two types of chains; that is two alpha chains and two beta chains.  
  • in its deoxygenated state hemoglobin has a low affinity for oxygen compared to myoglobin. When oxygen is bound to the first subunit of hemoglobin it leads to subtle changes to the quaternary structure of the protein. This in turn makes it easier for a subsequent molecule of oxygen to bind to the next subunit.
8 0
3 years ago
What is the equilibrium constant of pure water at 25°C?
STatiana [176]

Answer: 1.0 × 10-14

Explanation:

Pure water, represented as

H2O --> [H+] + [OH -]

undergoes a reversible reaction in which both H+ and OH- are generated.

The equilibrium constant for this reaction, called the water dissociation constant, Kw, is 1.0 × 10-14 at 25 °C.

5 0
3 years ago
Read 2 more answers
1. Identifying two types of energy<br> 2. Explaining how you know they are there
den301095 [7]

Answer:

Kinetic Energy and Potential Energy

Explanation:

When an object is in motion(ie.moving), it has kinetic energy. Energy stored in an object due to position and state, is called potential energy.

4 0
3 years ago
How much is the mass of a man if
lesantik [10]

Answer:

50kg

Explanation:

Using the formula for potential energy, which is the amount of energy due to position;

P.E = m × g × h

Where;

m = mass (kg)

g = acceleration due to gravity (10m/s²)

h = height (metres)

According to the information provided in this question, m = ?, P.E = 2500J, h = 5m

Using P.E = m × g × h

m = P.E/gh

m = 2500/(5 × 10)

m = 2500/50

m = 50kg

The mass of the man is 50kg.

5 0
3 years ago
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