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vodka [1.7K]
3 years ago
9

Which term describes atoms with unpaired dots in their electron dot diagrams?

Chemistry
1 answer:
IRISSAK [1]3 years ago
8 0

Answer:

Radicals

Explanation:

A radical refers to a chemical specie that contains unpaired electrons in their dot electron diagrams.

Radicals contain an odd number of electrons. They are commonly called odd electron species.

Radicals participate in a number of important reactions. A typical example is the halogenation of alkanes in the presence of light.

Examples of radicals include; Br. , Cl. , F. etc

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5. How many moles of NaCl will it take to make 3.0 L of<br> a 0.1 M solution?
Ilia_Sergeevich [38]

Answer:

0.30 mole NaCl needed.

Explanation:

From the definition of solution molarity => Molarity = moles solute / Volume of Solution in Liters => Molarity = moles/Volume(L) => solve for moles =>

moles = Molarity X Volume(L) = (0.1M)(3.0L) = 0.30 mole NaCl needed.

8 0
2 years ago
(Atomic masses used are C = 12.0 g mol–1, O = 16.0 g mol–1, H = 1.01 g mol–1, Cu = 63.5 g mol–1,)
alex41 [277]

<u>Question 1</u>

The formula mass of methanol is 12.0+3(1.01)+16.0+1.01=32.04 g/mol.

Therefore, in 5.0 grams of methanol, there are 5.0/32.04=\boxed{0.16} moles.

<u />

<u>Question 2</u>

The formula mass of copper(II) carbonate is 63.5+12.0+3(16.0)=123.5 g/mol.

This means that in 9.0 grams of copper(II) carbonate, there are 9.0/123.5=0.072874493927126 moles.

Using Avogradro's number, there are (0.072874493927126)(6.022 \times 10^{23})=\boxed{4.4 \times 10^{22}} molecules.

<u>Question 3</u>

The formula mass of cyclohexane is 12.0(6)+1.01(12)=84.12 g/mol.

So, 3.0 grams of cyclohexane is the same as 3.0/84.12=\boxed{0.036} moles.

<u>Question 4</u>

The formula mass of benzene is 12.0(6)+1.01(6)=78.06 g/mol.

This means that 4.00 moles of benzene has a mass of (78.06)(4.00)=\boxed{312} grams.

<u>Question 5</u>

1000 atoms of calcium is the same as \frac{1.000}{6.022 \times 10^{23}} moles.

This is equal to \frac{1000}{6.022 \times 10^{23}} \cdot 40.078=\boxed{6.7 \times 10^{-20}} grams.

6 0
1 year ago
179.1 g of water is in a Styrofoam calorimeter of negligible heat capacity. The initial T of the water is 16.1oC. After 306.9 g
taurus [48]

Answer:

the specific heat of the unknown compound is c_u=0.412J/g \cdot C

Explanation:

Generally the change in temperature of water is evaluated as

                \Delta T = T_2 -T_1

Substituting 16.1°C for T_1 and 27.4°C for T_2

                \Delta T = 27.4 - 16.1

                       =11.3^oC

Generally the change in temperature of  unknown compound is evaluated as

                  \Delta T_u = T_3 -T_2

Substituting 27.4°C for T_2 and 94.3°C for T_3

                                    \Delta T = 94.3 - 27.4

                                           =66.9^oC

Since there is an increase in temperature then heat is gained by water and this can be evaluated as

               H_w = mc_w \Delta T

Substituting 179.1 g  for m , 4.18 J/g.C for c_w(specific heat of water)

             H_w = 4.18 * 179.1 * 11.3

                   = 8459.6J

Since there is a decrease in temperature then heat is lost by unknown compound and this can be evaluated as

                    H_u = m_uc_u \Delta T_u

By conservation of energy law

       Heat lost  = Heat gained  

Substituting 306.9 g  for m_u , 8459.6J for H_u

           8459.6 = 306.9 * c_u * 66.9

  Therefore     c_u = \frac{8459.6}{308.9 *66.9}

                           =0.412J/g \cdot C

                   

4 0
3 years ago
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tia_tia [17]
Human bone does not contain oxygen
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Jose’s lab instructor gives him a solution of sodium phosphate that is buffered to a pH of 4. Because of an error that he made w
RoseWind [281]
His measurements are precise since his pH values are close to each other in a way that it was repeated in all measurements. On the contrary to accuracy, it is the closeness to the actual pH value he should have achieved. Therefore, Jose's results are precise but not accurate since his value is not close to the actual value of pH 4.
3 0
3 years ago
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