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Tcecarenko [31]
3 years ago
5

Greg classified some substances as shown in the table. Greg's Table Soluble in Water Insoluble in Water Dishwashing detergent Cl

oth Drink mix Plastic Sand Copper Why is Greg's table incorrect? Plastic is soluble in water. Copper is soluble in water. Sand is insoluble in water. Drink mix is insoluble in water.
Chemistry
2 answers:
Lisa [10]3 years ago
7 0

Answer: Option (c) is the correct answer.

Explanation:

If a substance completely dissolves in water and results in the formation of a clear solution then it means the substance is soluble in water.

For example, dish washing detergent, and drink mix are both soluble in water.

Whereas if a substance at all does not dissolve in water then we are able to see particles of the substance into the water. This substance is known as water insoluble substance.

For example, cloth, plastic, sand, and copper are all insoluble in water.

Thus, we can conclude that Greg's table is incorrect because sand is insoluble in water.

densk [106]3 years ago
6 0

Greg’s table is incorrect because sand is insoluble in water.

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Oxalic Acid, a compound found in plants and vegetables such as rhubarb, has a mass percent composition of 26.7% C, 2.24% H, and
blondinia [14]

Answer:

HCO₂

Explanation:

From the information given:

The mass of the elements are:

Carbon C = 26.7 g;     Hydrogen H = 2.24 g     Oxygen O = 71.1 g

To determine the empirical formula;

First thing is to find the numbers of moles of each atom.

For Carbon:

=26.7 \ g\times \dfrac{1 \ mol }{12.01 \ g} \\ \\ =2.22 \ mol \ of \ Carbon

For Hydrogen:

=2.24 \ g\times \dfrac{1 \ mol }{1.008 \ g} \\ \\ =2.22 \ mol \ of \ Hydrogen

For Oxygen:

=71.1 \ g\times \dfrac{1 \ mol }{1.008 \ g} \\ \\ =4.44 \ mol \ of \ oxygen

Now; we use the smallest no of moles to divide the respective moles from above.

For carbon:

\dfrac{2.22 \ mol \ of \ carbon}{2.22} =1 \ mol \ of \ carbon

For Hydrogen:

\dfrac{2.22 \ mol \ of \ carbon}{2.22} =1 \ mol \ of \ hydrogen

For Oxygen:

\dfrac{4.44 \ mol \ of \ Oxygen}{2.22} =2 \ mol \ of \ oxygen

Thus, the empirical formula is HCO₂

4 0
3 years ago
A chemical company makes two brands of antifreeze. the first brand is 70% pure antifreeze, and the second brand is 95% pure anti
madreJ [45]

Answer is: 56 gallons of 70% antifreeze and 84 gallons of 95% antifreeze.


ω₁ = 70% ÷ 100% = 0.7; 70% pure antifreeze.

ω₂ = 95% ÷ 100% = 0.95.

ω₃<span> = 85% ÷ 100% = 0.85.
V</span>₁ = ?; volume of 70% antifreeze.

V₂ = ?; volume of 95% antifreeze.<span>
V</span>₃ = V₁ + V₂<span>.
V</span>₃ = 140 gal.

V₁ = 140 gal - V₂<span>.
ω</span>₁ · V₁ + ω₂ ·V₂ = ω₃ · V₃.

0.70 · (140 gal - V₂) + 0.95 · V₂ = 0.85 · 140 gal.

98 gal - 0.7V₂ + 0.95V₂ = 119 gal.

0.25V₂ = 21 gal.

V₂ = 21 gal ÷ 0.25.

V₂ = 84 gal.

V₁ = 140 gal - 84 gal.

V₁ = 56 gal.

4 0
3 years ago
All of the covalent carbon-carbon bonds in unsaturated hydrocarbons share 2 pairs of electrons.
Evgen [1.6K]

False. carbon-carbon bonds that share 2 pairs of electrons are double bonds. An unsaturated hydrocarbon isnt necessary to only have double bonds. they can also have single bonds or triple bonds.

5 0
3 years ago
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Two workers used a force of 100 N to move a sofa 4 meters in 2 seconds how much power
r-ruslan [8.4K]

Answer:

200 watts

Explanation:

First we have to find total work:

W =F(d)

W = 400J

Then plug that answer into the Power formula.

P = W/(t_f-t-i)

P = 400/2s

P = 200 W

3 0
3 years ago
A light has a wavelength of 4.10×10^12m . What is the Frequency?
LenaWriter [7]
Frequency=speed over wavelength
so you need to know the value of speed in light inordet to figure out the frequency.
7 0
3 years ago
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