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nydimaria [60]
3 years ago
14

Which of the following are most directly involved in chemical bonding?

Chemistry
1 answer:
monitta3 years ago
5 0

Valence electrons

Explanation:

In an atom, the valence electrons are the sub-atomic particles most directly involved in chemical bonding.

Valence electrons are the electrons in the outer most shell of an atom that are involved in chemical reactions.

Atoms of some elements show no tendency to combine with themselves or other kinds of atoms because their outer energy levels are completely filled.

The driving force for many interatomic bonding is the tendency to have completely filled outer energy levels.

To complete an atomic configuration, electrons are either gained or lost from the outermost shell where the valence electrons reside.

Learn more:

Chemical bonds brainly.com/question/10901976

#learnwithBrainly

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Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of ΔHc
jeka94

Answer:

T_f = 25.05°C

Explanation:

Given:

the value of ΔHcomb (heat of combustion) for dimethylphthalate (C10H10O4) is = 4685 kJ/mol.

mass = 0.905g of dimethylphthalate

molar mass = 194.18g dimethylphthalate

number of moles of dimethylphthalate = ???

T_i = 21.5°C

C_{calorimeter} = 6.15 kJ/°C

T_f = ???

since we have our molar mass and mass of dimethylphthalate ;we can determine the number of moles as;

0.905g of dimethylphthalate ×  \frac{1 mole (dimethylphthalate)}{194.184g(dimethylphthalate)}

number of moles of dimethylphthalate = 0.000466 moles

Heat released = moles of dimethylphthalate × heat of combustion

=  0.000466 moles × 4685 kJ

= 21.84 kJ

∴ Heat absorbed by the calorimeter =  C_{calorimeter} (T_f-T_i} )

21.84 kJ =6.15 kJ/°C * (T_f-21,5^0C)

21.84 KJ = (6.15 kJ/^0C * T_f) - (6.15 kJ/^0C*21.5^0C)

21.84 KJ = (6.15 kJ/^0C * T_f) - 132.225 kJ

21.84 KJ + 132.225 kJ = (6.15 kJ/^0C * T_f)

154.065 kJ = (6.15 kJ/^0C * T_f)

T_f = \frac{154.065kJ}{6.15kJ/^0C}

T_f =25.05°C

4 0
3 years ago
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Si se adiciona etilenglicol (compuesto no volátil) a agua destilada:
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Answer:

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Explanation:

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6 0
3 years ago
Predict: Will a 1500 kg car moving at the same speed as the tennis ball have
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The car will have more momentum because it has a greater mass. Momentum= mass x velocity therefore if both the objects have the same velocity the object with a greater mass will have more momentum
4 0
3 years ago
QUESTION 7
Temka [501]

The student's test average is : 0.92

Total score obtained = 369

Number of tests = 4

Since Each test is exactly 100 points ;

The total score obtainable is (100 × 4) = 400

Average = score obtained / total score obtainable

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Learn more : brainly.com/question/9416487?referrer=searchResults

5 0
3 years ago
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