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nadezda [96]
3 years ago
6

How many neutrons does element X have if its atomic number is 21 and its mass number is 95?

Chemistry
1 answer:
Softa [21]3 years ago
3 0
Atomic # = #of Protons(21)
Mass #= #of neutrons and protons(95)
Neutrons=74

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If an insect population increases and then decreases as the available supply of food changes, what does this demonstrate
Semenov [28]
D.

This is self-regulation because when the population of the insects becomes too large, it regulates itself and starts to decrease due to a shortage of resources.
7 0
3 years ago
How many electrons are in an ion of calcium (Ca2+)?<br> A. 2<br> B. 18<br> C. 0<br> D. 22
Elanso [62]
B 18 is the answer ......
7 0
2 years ago
A sample of water vapor has a volume of 3.15 L, a pressure of 2.40 atm, and a temperature of 325 K. What is the new temperature,
lara31 [8.8K]

Answer:

The answer to your question is:   T2 = 235.44 °K

Explanation:

Data

V1 = 3.15 L                    V2 = 2.78 L

P1 = 2.40 atm               P2 = 1.97 atm

T1 = 325°K                    T2 = ?

Formula

\frac{P1V1}{T1} = \frac{P2V2}{T2}

Process

            T2 = (P2V2T1) / (P1V1)

            T2 = (1.97x 2.78x 325) / (2.40 x 3.15)

            T2 = 1779.895 / 7.56

            T2 = 235.44 °K

4 0
3 years ago
Which statement correctly describes measuring with a graduated cylinder?​
snow_tiger [21]

Answer:

what are the options because a graduated cylinder is a science mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid

Explanation:

6 0
3 years ago
There are 34 questions on a test. John answers 22 correctly. What is Johns percent error?
VARVARA [1.3K]

Answer:

35 . 29%

Explanation:

no. of questions in test =34

no. of questions answered correctly =22

therefore, no. of questions answered incorrectly =34 - 22

=12

error percentage = 12/34 * 100

=35 .29 %

4 0
3 years ago
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