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Stels [109]
3 years ago
12

In an endothermic physical or chemical change,.

Chemistry
1 answer:
Ivan3 years ago
3 0

Answer:

c

Explanation:

If chemical equation neads heat to happen it's caled endothermic

eg. CaCO3 ---> CaO + CO2 (there is supposed to be a little t above the arrow)

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Is burning a phase change? Just a yes or no answer i don't need a whole copy and paste
Sladkaya [172]

Answer:

no

Explanation:

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Wwicth substance makes a recipe unheatly
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In the reaction 2H2O (l) + 2Cl– (aq) → H2 (g) + Cl2 (g) + 2OH– (aq), which substance is reduced?
Leno4ka [110]

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5 0
3 years ago
alculate the standard enthalpy of formation of ethanoic acid given that the standard enthalpy of combustion for carbon is –394 k
agasfer [191]

Answer:

The standard enthalpy of formation of ethanoic acid is -484 kJ/mol.

Explanation:

C(g)+O_2(g)\rightarrow CO_2(g),\Delta H_{1, comb}=-394 kJ/mol...[1]

H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l),\Delta H_{2, comb}=-286 kJ/mol..[2]

CH_3COOH(l)+2O_2(g)\rightarrow 2CO_2(g)+2H_2O(l),\Delta H_{3, comb}=-876 kJ/mol..[3]

The standard enthalpy of formation of ethanoic acid :

2C(g)+2H_2(g)+O_2(g)\rightarrow CH_3COOH, \Delta H_{4}=?..[4]

Using Hess's law to calculate :

2 × [1] + 2 × [2] - [3] = [4]

\Delta H_4=2\times (-394 kJ/mol)+2\times (-286 kJ/mol) - (-876 kJ/mol)

=\Delta H_4=-484 kJ/mol

The standard enthalpy of formation of ethanoic acid is -484 kJ/mol.

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3 years ago
A molecule that does not have a positive end and a negative end is called a _____ molecule. polar nonpolar neutral ionized
Lilit [14]
Non polar molecule have no partial charge ....so non polar answer !!!
7 0
4 years ago
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