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3 years ago

Why is it difficult to detect the presence of isotopes of an element during chemical studies?

Chemistry

1 answer:

slavikrds [6]3 years ago

7 0

Answer:

Isotopes are atoms that have different number of neutrons, so they have a different mass number than the other atoms in an element.

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How is iodine-131 the same as iodine-126

tamaranim1 [39]

Iodine 131 and iodine 126 are the same in the sense that, they both have the same number of electrons and protons in their atoms, it is only the number of their neutrons that is different. Iodine 131 has 78 neutrons while iodine 126 has 73 neutrons.

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3 years ago

What "waste" does the blood cell drop off at the lungs .... ANSWER ASAP AND I POINT EXTRA

bekas [8.4K]

I believe the answer is carbon dioxide

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3 years ago

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a sample of compound determined to contain 1.71 g C and 0.287 g H. The corresponding empirical formula is

fiasKO [112]

Answer: The empirical formula is $CH_2$ .

Explanation:

Mass of C = 1.71 g

Mass of H = 0.287 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{1.71g}{12g/mole}=0.142moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.287g}{1g/mole}=0.287moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{0.142}{0.142}=1$

For H = $\frac{0.287}{0.142}=2$

The ratio of C: H = 1: 2

Hence the empirical formula is $CH_2$ .

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3 years ago

Which of the following are examples of elements?<br> a. CO<br> b. Li<br> c. KBr<br> d. Ca

bogdanovich [222]

$\huge\boxed{\textsf{Li and Ca}}$

An element is a substance that can't be broken down further. Lithium (Li) and calcium (Ca) are examples of elements.

Carbon monoxide (CO) and potassium bromide (KBr) are examples of compounds, which are made up of more than one element put together.

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2 years ago

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Trava [24]

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3 years ago

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