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muminat
4 years ago
6

6)

Chemistry
1 answer:
MrMuchimi4 years ago
7 0

Answer:

(4) Water, stirring, and filtering  

Explanation:

The added water will dissolve the sugar but not the sand. When you filter the mixture, the sand will be trapped in the filter paper and the dissolved sugar will pass through the pores of the paper.

(1) and (2) are wrong. You don't separate a mixture of sugar and sand by adding more sand. Furthermore, neither substance will boil at 100 °C.

(3) is wrong. You can dissolve the sugar in water but, if you boil the water away, the sugar and sand will still be together.

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In what type of radioactive decay does the atomic number of the product decrease by one? Select all that apply.
VladimirAG [237]
The atomic number of the product decrease by one in the d) positron emission and the e) electron capture radioactive decay. These radioactive decays are two of three common forms of the Beta Decay which occurred when the proton released a positron and a neutron emitted an electron<span>. The Beta Decay can increase or decrease the atomic number.</span>
4 0
3 years ago
The Ksp of barium fluoride, BaF2, is 1.6 x 10-6. A solution of 5.0M NaF is added dropwise to a 2.0L solution that is 0.016 M in
Hatshy [7]

Answer:

Precipitation will occur after the concentration of fluoride ions exceeds 0.01 M.

4 mL volume of NaF must be added to cause BaF_2 to precipitate.

Explanation:

Concentration of barium ions = [Ba^{2+}]=0.016 M

Volume of barium ion solution = 2.0 L

BaF_2\rightleftharpoons Ba^{2+}+2F^-

The solubility product of the barium fluoride = K_{sp}=1.6\times 10^{-6}

K_{sp}=[Ba^{2+}][F^-]^2

1.6\times 10^{-6}=[0.016 M]\times [F^-]^2

[F^-]=0.01 M

Precipitation will occur after the concentration of fluoride ions exceeds 0.01 M.

Concentration of fluoride ion = C_1=0.01 M

Volume of solution = V_1=2.0 L

Concentration of NaF solution added = C_2=5.0 M

Volume of NaF solution added = V_2=?

C_1V_1=C_2V_2

V_2=\frac{0.01 M\times 2.0 L}{5.0 M}=0.004L

1 L = 1000 mL

0.004 L = 0.004 × 1000 mL = 4 mL

4 mL volume of NaF must be added to cause BaF_2 to precipitate.

3 0
3 years ago
Calculate the energies of the n=2 and n=3 states of the hydrogen atom in Joules per<br> atom
kondor19780726 [428]

Answer:

See Explanation

Explanation:

Positional Energy for electron as function of principle energy level (n)

=> Eₙ = -A/n²; A = 2.18x10⁻¹⁸J

Positional Energy for electron in n=2 => E₂ = -2.18x10⁻¹⁸/(2)² = -5.45x10⁻¹⁹J

Positional Energy for electron in n=3 => E₃ = -2.18x10⁻¹⁸/(3)² = -2.42x10⁻¹⁹J

ΔE(n=3→2) = -5.45x10⁻¹⁹J - (-2.42x10⁻¹⁹J) =   -3.03x10⁻¹⁹J

7 0
3 years ago
Which liquids are highly sensitive to both changes in temperature and changes in the electrical field?
Mumz [18]
Liquid crystal molecules have very unique structures, allowing them to be highly affected by electric fields, changing their orientation in the liquid crystal structure. This is why they are used in LCD screens. They are also highly sensitive to changes in temperature. Therefore the answer is C.
Hope this helps!
3 0
3 years ago
Read 2 more answers
Determine the gram-formula mass of stearin acid C17H35COOH
solmaris [256]

Answer:

284.48 g/mol

Explanation:

You can find the molar mass of any molecule by looking at a periodic table and adding up all of the masses of each element. When you do this with stearic acid, you get somewhere around 284.5 g/mol. Hope this helped!

8 0
3 years ago
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