2 years ago

Which of the following describes an element? Choose all that apply.

Chemistry

1 answer:

Kisachek [45]2 years ago

5 0

Answer:

A) Gold is an example.

D) There is only one type of substance present.

F) Composed of one type of atom with its own unique properties.

Explanation:

Hello! These are the correct answers! (I took the K12 quiz)

Have a blessed day! :)

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How many atoms are there in 1.3 x 10^22 molecules of N(O)2

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1 molecule of NO2 included N atom and 2 oxygen atoms, so a total of 3 atoms per molecule.

1.3 x 10^22 times 3 = 3.9 x 10^22 atoms

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In a hospital laboratory, a 10.0 mL sample of gastric juice (predominantly HCl), obtained several hours after a meal, was titrat

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Answer: 1.14

Explanation:

$HCl+NaOH\rightarrow NaCl+H_2O$

To calculate the molarity of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $HCl$

are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=?\\V_1=10.0mL\\n_2=1\\M_2=0.1M\\V_2=7.2mL$

Putting values in above equation, we get:

$1\times M_1\times 10.0=1\times 0.1\times 7.2\\\\M_1=0.072M$

To calculate pH of gastric juice:

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$pH=-log[H^+]$

$pH=-log(0.072)=1.14$

Thus the pH of the gastric juice is 1.14

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3 years ago

In what state of matter do molecules bounce off one another rapidly and freely

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I think its gas i forgot

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What is true of a synthesis reaction?

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There is only one product in a synthesis reaction.

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