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4 years ago

What is an atom? ? ? ?

Chemistry

2 answers:

navik [9.2K]4 years ago

6 0

Basic unit of a chemical element or atoms as a source of nuclear energy
straight out of dictionary

zzz [600]4 years ago

3 0

Atom is the simplest constituent of any substance.

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Which of the first 20 elements in a Periodic table has atoms with the greatest mass?

Rainbow [258]

Calcium has the greatest mass of the first twenty elements with a mass of approximately 40.08

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2 years ago

Stirring a liquid while you are mixing in another ingredient speeds up the rate of dissolving. Question 13 options: True False

brilliants [131]

Answer:

true

Explanation:

This is because it helps distribute the particles that are being dissolved.

8 0

3 years ago

Read 2 more answers

Tertiary or top consumers are animals at the top of the food web. They may feed off either primary or secondary consumers. What

babymother [125]

Answer:

Coyotes, Bald Eagles, & Gray wolf.

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3 years ago

Which method would be best to separate a mixture of sand and gravel?

solniwko [45]

Here, as they both are physical things without any magnetic property & density difference, screening would be best.

In short, Your Answer would be Option C

Hope this helps!

7 0

4 years ago

Read 2 more answers

or a particular isomer of C 8 H 18 , the combustion reaction produces 5104.1 kJ of heat per mole of C 8 H 18 ( g ) consumed, und

beks73 [17]

Answer:

The standard enthalpy of formation of this isomer of $C_{8}H_{18}$ is -220.1 kJ/mol.

Explanation:

The given chemical reaction is as follows.

$C_{8}H_{18}(g)+ \frac{25}{2}O_{2}(g) \rightarrow 8CO_{2}(g)+9H_{2}O(g)$

$\Delta H^{o}_{rxn}= -5104.1kJ/mol$

The expression for the entropy change for the reaction is as follows.

$\Delta H^{o}_{rxn}=[8\Delta H^{o}_{f}(CO_{2}) +9\Delta H^{o}_{f}(H_{2}O)]-[\Delta H^{o}_{f}(C_{8}H_{18})+ \frac{25}{2}\Delta H^{o}_{f}(O_{2})]$

$\Delta H^{o}_{f}(H_{2}O)= -241.8kJ/mol$

$\Delta H^{o}_{f}(CO_{2})= -393.5kJ/mol$

$\Delta H^{o}_{f}(O_{2})= 0kJ/mol$

Substitute the all values in the entropy change expression.

$-5104.1kJ/mol=[8(-393.5)+9(-241.8)kJ/mol]-[\Delta H^{o}_{f}(C_{8}H_{18})+ \frac{25}{2}(0)kJ/mol]$

$-5104.1kJ/mol=-5324.2kJ/mol -\Delta H^{o}_{f}(C_{8}H_{18})$

$\Delta H^{o}_{f}(C_{8}H_{18}) =-5324.2kJ/mol +5104.1kJ/mol$

$=-220.1kJ/mol$

Therefore, The standard enthalpy of formation of this isomer of $C_{8}H_{18}$ is -220.1 kJ/mol.

4 0

3 years ago