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jekas [21]
3 years ago
14

Complete each of the definitions with the appropriate phrase. Precision means that ___________measurements are close to_________

___ Accuracy means that___________ measurements are close to_____________
Chemistry
1 answer:
Gwar [14]3 years ago
5 0

Answer:

Precision means that <u><em>independent </em></u>measurements are close to <u><em>each other.</em></u>

Accuracy means that <u><em>independent</em></u> measurements are close to <u><em>a known or accepted value.</em></u>

Explanation:

Accuracy refers to how close the measurements of a measurement system are to the true value while precision refers to how close the measurements are to each other. In other words, accuracy is the closeness of the value of one or more independent measurements to a true value, and precision is the closeness of two or more values ​​of several measurements to each other.

Both are independent of each other, that is to say that the results in the values ​​of a measurement can be precise and not exact, and vice versa.

So:

Precision means that <u><em>independent </em></u>measurements are close to <u><em>each other.</em></u>

Accuracy means that <u><em>independent</em></u> measurements are close to <u><em>a known or accepted value.</em></u>

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Ice melts into water. The correct equation to calculate the heat of this reaction is
LuckyWell [14K]

Answer:

The correct equation to calculate the heat of this reaction is:

ΔH = m*s*∆T

Explanation:

During any chemical reaction, heat can either be absorbed from the environment or released to the environment through the reaction. The heat exchange between a chemical reaction and its environment is known as the reaction enthalpy, or H. However, H cannot be measured directly; the change in temperature of a reaction over time is used to find the enthalpy change over time (denoted as ΔH).

In general ΔH = m*s*∆T, where m is the mass of the reactants, s is the specific heat of the product, and ΔT is the change in the reaction temperature.

3 0
3 years ago
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viktelen [127]
I took the test I think the guy above is correct I’m not to sure good luck thanks
8 0
2 years ago
A certain first-order reaction is 27.5 percent complete in 8.90 min at 25°C. What is its rate constant?
jeyben [28]

Answer:

k= 0.145min^{-1}

Explanation:

Hello there!

In this case, according to the given information, it turns out necessary for us remember that the first-order kinetics is given by:

ln(A/A_0)=-kt

Whereas the 27.5% complete means A/Ao=0.275, and thus, we solve for the rate constant as follows:

k=\frac{ln(A/A_0)}{-t}

Then, we plug in the variables to obtain:

k=\frac{ln(0.275)}{-8.90min}\\\\k= 0.145min^{-1}

Regards!

4 0
3 years ago
What function does adding a coefficient in a chemical equation serve?​
shtirl [24]

Answer:

coefficients increase the products to increase the efficiency of the reaction.Coefficients balance the equation with respect to the law of conversation of mass. coefficients also increases the reactants to help the reaction proceed.

3 0
4 years ago
Which is a cause of acid precipitation?
Leya [2.2K]

Answer:

B

Explanation:

B

7 0
3 years ago
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