Answer:
The reaction will absorb energy
Explanation:
A potential energy diagram shows the energy changes that occur during a chemical reaction. It is also called a reaction progress curve. The diagram shows the changes that occur as reactants are converted into products.
The best conclusion according to the energy diagram of the chemical reaction is that the reaction will absorb energy.
Be more specific, I could possibly find the asnwer you're looking towards.
Explanation:
We need to go through to stages to boil 41.1 g of water. We have to heat the sample of water from 84.7 °C to 100 °C (the boiling point) And then we have to provide enough heat to boil all the sample of water.
<em>a) Heating from 84.7 °C to 100 °C:</em>
This is calculated using the formula:
Q₁ = m * C * ΔT
Where Q₁ is the amount of heat, m is the mass of the sample, C is the specific heat of water and ΔT is the temperature change. We already know these values:
m = 41.1 g
C = 4.184 J/(g*°C)
ΔT = Tfinal - Tinitial = 100 °C - 84.7 °C
ΔT = 15.3 °C
Replacing these values we can get the amount of heat necessary for the first step:
Q₁ = m * C * ΔT
Q₁ = 41.1 g * 4.184 J/(g°C) * 15.3 °C
Q₁ = 2631 J
<em>b) Boiling 41.1 g of water:</em>
To find the amount of heat that we need to provide to the sample of water to completely boil it we can use this formula:
Q₂ = m * Cv
Where Cv is the latent heat of vaporization.
Cv = 2256 J/g
Q₂ = m * Cv
Q₂ = 41.1 g * 2256 J/g
Q₂ = 92721 J
<em>c) Total amount of heat:</em>
Qtotal = Q₁ + Q₂
Qtotal = 2631 J + 92721 J
Qtotal = 95352 J = 95400 J
Qtotal = 95.4 kJ
Answer: The amount of heat needed to boil the sample of water is 95.4 kJ or 95400 J.
Answer:
B. How much energy it takes to heat a substance
Explanation:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
The substances with higher value of specific heat capacity require more heat to raise the temperature by one degree as compared the substances having low value of specific heat capacity. For example,
The specific heat capacity of oil is 1.57 j/g. K and for water is 4.18 j/g.K. So, water take a time to increase its temperature by one degree by absorbing more heat while oil will heat up faster by absorbing less amount of heat.
Consider that both oil and water have same mass of 5g and change in temperature is 15 K. Thus amount of heat thy absorbed to raise the temperature is,
For oil:
Q = m.c. ΔT
Q = 5 g× 1.67 j/g K × 15 K
Q = 125.25 j
For water:
Q = m.c. ΔT
Q = 5 g× 4.18 j/g K × 15 K
Q = 313.5 j
we can observe that water require more heat which is 313.5 j to increase its temperature.
Answer:
d making models.
Explanation:
When scientists create a representation of a complex process, they are inferring that they are making models.
A model is an abstraction of the real world or a complex process. Models are very useful in developing solutions to processes that are not easily simplified.
- The models allow a part of a body to be simply studied.
- Through this simple abstraction, extrapolations to other parts of the system can be deduced.
- This can give very useful insights into the other parts of the system.
- The heterogeneity of complex processes is a huge limitation to understanding them.
- A homogenous part can be modelled and used to understand the system.
