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3 years ago

In what ways are final grade calculations and atomic mass calculations similar?

Chemistry

1 answer:

Gennadij [26K]3 years ago

3 0

Answer:

atomic mass calculations are similar to final grade calculations in how the two are calculated. In school, your given different kinds of work that has a different effect on your grade. Homework might be worth 20 percent while a tests are worth 80 percent. the percentage of these assignments are the weight they have on your grade. when you multiply the weight by the score, you get a weighted score that you can add with other weighted scores to reach a total, that total would be your grade. Atomic mass calculations are found the same way, first turn the percent abundance into a decimal (divide by 100, 97% becomes .97) multiply it by Mass (AMU) and you get that isotopes mass contribution. do this for the isotopes for whatever element, and add up the total. the total will be your element's atomic mass.

Explanation:

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3) During the day at 27°C a cylinder with a sliding top contains 20.0 liters

tatiyna

Answer:

$T_2=12\°C$

Explanation:

Hello there!

In this case, according to the Charles' law equation which help us to understand the directly proportional relationship between volume and temperature:

$\frac{T_2}{V_2}=\frac{T_1}{V_1}$

Thus, by solving for the final temperature, T2, and making sure we use the temperatures in Kelvin, we can calculate the final temperature as shown below:

$T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{(27+273)K*19L}{20.0L}\\\\T_2=285-273\\\\T_2=12\°C$

Best regards!

4 0

3 years ago

A chemical change occurs when an egg cooks. What effect does cooking have on the physical properties of an egg?

fomenos

I'm not sure, but maybe burning point...

4 0

3 years ago

Can someone answer this please?

krok68 [10]

What is the question??

3 0

3 years ago

Label each of the following changes as a physical change or chemical change. Give evidence to support your answer.

SVEN [57.7K]

Answer:

A catalytic converter changes nitrogen dioxide to nitrogen gas and oxygen gas is a chemical change.

Explanation:

Hello.

In this case, since physical changes do not modify the molecular composition and structure of the material undergoing it whereas the chemical change does, for catalytic converters we should know they promote chemical reaction in which the composition is changed; for instance, for the given example, the following chemical reaction is the evidence:

$2NO_2\rightarrow N_2+O_2$

As you can see, nitrogen and oxygen are no longer bonded but separated by themselves, therefore, this is a chemical change.

Best regards.

3 0

3 years ago

Caclulate the pH for a solution with an [H+] = 9.75 x10-4

vovangra [49]

Answer:

pH=3.01

Explanation:

pH=-log[H+]

=-log(9.74x10e-4)

=3.01

3 0

4 years ago