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liberstina [14]
3 years ago
15

Define activation energy.Activation energy is Define activation energy.the energy barrier that must be surmounted in order for t

he reactants to transform into products.the energy difference between the reactants and the products.the energy released by the reactants while transforming into products.the energy released by the products while transforming into reactant
Chemistry
1 answer:
Natali [406]3 years ago
5 0

Answer:

the energy barrier that must be surmounted in order for the reactants to transform into products.

Explanation:

When we draw a reaction profile, there is always a hump that is found between the reactants and products. This hump is called the activation energy.

The activation energy of a reaction stands as a sort of barrier between reactants and products which must be surmounted before the reactants are converted into products.

Only reactants that possess the activation energy can be converted from reactants to products.

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According to the cooling curve, what is the approximate freezing point of the substance?
Dmitry_Shevchenko [17]

Correct answer: B

Cooling curve is the plot of temperature versus time as the sample is allowed to cool. In a cooling curve, we start at a temperature greater than the boiling point. At this temperature, the sample is in gaseous state. At the boiling point, there is no change in temperature as the gaseous and liquid states are in equilibrium. As the temperature reduces further, the liquid starts to condense and at the melting point of the sample the liquid undergoes phase transition to solid state. At the melting temperature, a second plateau is observed as the temperature remains unchanged. At temperatures below the melting point, the sample exists as a solid.

So from the curve, the second plateau is observed at around -111^{0}C. This point represents the phase transition from liquid to solid state.

6 0
3 years ago
Read 2 more answers
Which of the following is the quantum number set for an electron in the 3rd energy level, dumb-bell shaped orbital, on the z-axi
Juli2301 [7.4K]

Answer:

Explanation:

Principal quantum no "n" = 3

Azimuthal quantum no "l"= 1

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Over all is 3pz

5 0
3 years ago
1) Write the symbol and charge for each individual ion
ololo11 [35]

N -3

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F -1

I -1

Ca +2

Mg +2

S -2

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//

Ba3N2

SrF2

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MgS

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//

I don't really understand 2.

3 0
3 years ago
Why is potassium placed in the periodic table where it is?
Virty [35]
Potassium is placed where it is based on its properties and it's reactivity. It's also placed there based on it's atomic number. 
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Which one is a true statement about endothermic reactions?
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In a endothermic reaction energy from an outside source is continuously being added.
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