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3 years ago

GIVING BRAINLIEST! Please answer with 5-7 sentences.

2 answers:

5 0

Answer:Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.

Explanation:lol

Artist 52 [7]3 years ago

4 0

Answer:

Exothermic reaction is a process where energy is released. energy may be released in the form of heat or light. it occurs when the total energy of the products is less than the total energy of the reactants.

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CHEMISTRY AGAIN PAPER 4

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3 years ago

Which one of the following compounds will NOT be soluble in water?

cluponka [151]

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3 years ago

The sodium atom loses an electron to form a sodium Ion (Na+). Which statement is correct with respect to its atomic radius?

SCORPION-xisa [38]

Answer:

sodium ion has smaller radius than a atom.

Explanation:

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3 years ago

How many atoms are in two water molecules? pls and thxxxxxxxxx

arlik [135]

Answer:

A water molecule consists of three atoms; an oxygen atom and two hydrogen atoms, which are bond together like little magnets. The atoms consist of matter that has a nucleus in the centre. one mole of water contains 6.02 x 1023 MOLECULES of water But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 1024 atoms in a mole of water.Feb 12, 2003

Explanation:

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3 years ago

C3H8+3O2 = 3CO2+4H2O what is the enthalpy combustion

dezoksy [38]

Answer:

$\Delta H_{comb}=2043.85kJ/mol$

Explanation:

Hello there!

In this case, according to the given chemical reaction, it possible for us to set up the expression for the calculation of the enthalpy change as shown below:

$\Delta H_r=-\Delta H_{comb}=3\Delta _fH_{CO_2}+4\Delta _fH_{H_2O}-\Delta _fH_{C_3H_8}-3\Delta _fH_{O_2}$

Thus, given the values of the enthalpies of formation on the attached file, we obtain: $-\Delta H_{comb}=3(-393.5kJ/mol)+4(-241.8kJ/mol)-(-103.85kJ/mol)-3(0kJ/mol)\\\\-\Delta H_{comb}=-2043.85kJ/mol\\\\\Delta H_{comb}=2043.85kJ/mol$

Best regards!

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3 years ago