2 years ago

What is love? A)don't hurt me B)don't hurt me C)No more

Chemistry

2 answers:

Nostrana [21]2 years ago

6 0

A because A is the only answer

Jlenok [28]2 years ago

6 0

Answer:

Explanation:

I think it is a ever lasting process of pain and happiness cause the ones that are closest to you can make it hurt most but they can also make your day So probably

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kvasek [131]

election circles the nucleus

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2 years ago

What are three ways in which a metal is different to a non-metal?

elena-14-01-66 [18.8K]

Answer:

1)non.metals gain electron but metals lose electron.

2)metals are good conductor of heat and electricity but non.meatals are bad conductor of heat and electricity.

3)most of metals are shiny but non .metals are not.

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3 years ago

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Which block of elements do the halogens belong to?<br> a. p block<br> c. d block<br> b. s block?

kykrilka [37]

A. p block

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3 years ago

How are energy and mass connected during the formation of an atom?

ss7ja [257]

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3 years ago

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Calculate the DH°rxn for the decomposition of calcium carbonate to calcium oxide and carbon dioxide. DH°f means delta or change

USPshnik [31]

Answer: +178.3 kJ

Explanation:

The chemical equation follows:

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

The equation for the enthalpy change of the above reaction is:

$\Delta H^o_{rxn}=[(1\times \Delta H^o_f_{(CaO(s))})+(1\times \Delta H^0f_{CO_2}]-[(1\times \Delta H^o_f_{(CaCO_3(s))})]$

We are given:

$\Delta H^o_f_{(CaO(s))}=-635.1kJ/mol\\\Delta H^o_f_{(CaCO_3(s))}=-1206.9kJ/mol\\\Delta H^o_f_{(CO_2(g))}=-393.5kJ/mol\\\Delta H^o_{rxn}=?$

Putting values in above equation, we get:

$\Delta H^o_{rxn}=[(1\times (-635.1))+(1\times (-393.5))]-[(1\times (-1206.9))]$

The DH°rxn for the decomposition of calcium carbonate to calcium oxide and carbon dioxide is +178.3 kJ

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3 years ago