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3 years ago

3

Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds. drag each item to the a

ppropriate bin.

1 answer:

Gnesinka [82]3 years ago

6 0

Co2 is correct buddy

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Which element in group 16 is most likely to gain an electron?

Jobisdone [24]

oxygen because it has only one oxidation state of -2, all the other elements in the group have multiple oxidation states.

4 0

4 years ago

6.45 g of C6H12O6 is burned in a bomb calorimeter containing 950. g of water and the temperature goes from 35.0∘C to 42.3∘C. If

emmasim [6.3K]

Answer:

$q_{rxn}=-488.86\frac{kJ}{mol}$

Explanation:

Hello!

In this case, since this calorimetry problems can by analyzed by figuring out that the heat lost due to the combustion of C6H12O6 is gained by the water and the calorimeter which undergo the mentioned temperature rise, we can write:

$Q_{rxn}=-(m_wC_w+C_c)(T_2-T_1)$

Thus, by plugging in the given data, we obtain:

$Q_{rxn}=-(950.0g*4.184\frac{J}{g\°C} +933\frac{J}{\°C})(42.3\°C-35.0\°C)\\\\Q_{rxn}=-17.5kJ$

Next, we compute the moles of C6H12O6 by using its molar mass (180.18 g/mol) as shown below:

$n=6.45g*\frac{1mol}{180.18g} =0.0358mol$

Thus, the value for q of the reaction turns out:

$q_{rxn}=\frac{Q_{rxn}}{n} \\\\q_{rxn}=\frac{17.5kJ}{0.0358mol} \\\\q_{rxn}=-488.86\frac{kJ}{mol}$

Best regards!

8 0

3 years ago

Read 2 more answers

A solution of ammonia and water contains 2.60×1025 water molecules and 6.90×1024 ammonia molecules. how many total hydrogen atom

marshall27 [118]

1 molecule of NH3 has 3 atoms of H.
6.90*10²⁴ molecules NH3 have 3*6.90*10²⁴ =20.7*10²⁴ atoms H=2.07*10²⁵ atoms H

1 molecule H2O of has 2 atoms of H.
2.60*10²⁵ molecules of H2O have 2*2.60*10²⁵ =5.20 *10²⁵ atoms of H

2.07*10²⁵ + 5.20 *10²⁵ =7.27*10²⁵ atoms of H altogether.

4 0

3 years ago

Which is an example of an element? A) salt (NaCl) B) water (H20) C) silver (Ag) D) electron (e-)

Artemon [7]

The answer is c. silver (AG)

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3 years ago

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All matter has mass and takes up space.<br> True<br> False

jasenka [17]

True, all matter has mass and takes up space.

3 0

4 years ago