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3 years ago

Ahh, help me I don’t know what to pick

Chemistry

1 answer:

Maksim231197 [3]3 years ago

8 0

Answer:

for what? is there supposed to be a picture?

Explanation:

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A vial of amoxicillin contains 500 mg in 2.0 mL of solution. What volume of the solution contains 180 mg of the drug

Tom [10]

<span>0.72 mL of solution will have 180 mg of amoxicillin. For this problem, you need to calculate the equivalent ratio of volume as to the ratio of amoxicillin. So 180/500 = X/2.0 Multiply both sides by 2 2 * 180/500 = X 360/500 = X 18/25 = X 0.72 = X So you need 0.72 mL of solution to get 180 mg of the drug.</span>

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3 years ago

What is the structural formula of pent-3-en-1-yl? <br>Thx

krek1111 [17]

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3 years ago

Vinegar is a chemical used in cooking, cleaning and other common experiences. A 0.1 M solution of vinegar in water has a [H+] of

Ymorist [56]

Answer: a) pH of a 0.1 M vinegar solution is 2.9

b) It is an acid as pH is less than 7

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

As vinegar is a weak acid, its dissociation is represented as;

$CH_3COOH\rightleftharpoons H^+CH-3COO^-$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.1 M

$[H^+]=c\times \alpha$

$[H^+]=0.1\times \alpha$

$1.3\times 10^{-3}=0.1\times \alpha$

$\alpha=0.013$

Also $pH=-log[H^+]$

$pH=-log[1.3\times 10^{-3}]=2.9$

Thus pH of a 0.1 M vinegar solution is 2.9

As pH is less than 7, it is an acid.

7 0

4 years ago

For a science experiment Marcia dissolved 1.0 kilogram of salt in 3.0 liters of water. For a different experiment, Bobby dissolv

My name is Ann [436]

Answer: Marcia made a more concentrated salt solution.

Explanation:

Marcia used 1 kg of salt, which the exercise tells us is 2.2 lb.

She dissolved it in 3L of water, so we have to find out how much that is in pints. We do that using cross multiplication.

If 1L equals 2.11 pints, then

xpints / 3L = 2.11pints / 1L, so

xpints = (3L . 2.11pints) / 1L = 6.33 pints

Now we know she dissolved 2.2lb in 6.33 pints of water. We use cross multiplication again to find out how much salt she would have in 10 pints, so we can know how concentrated it is compared to Bobby's solution, which is 10 pints.

xlb / 10pints = 2.2lb / 6.33pints

xlb = (10pints . 2.2lb) / 6.33pints = 3.47lb

So Marcia has a concentration of 3.47lb per 10 pints, whereas Bobby only has 3lb per 10 pints.

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3 years ago

When two atoms of element Y combine, Y2 molecule is formed.

Liula [17]

Answer:

chemical bond

Explanation:

because this is the only bond used in chemical reactions just like molecules of atoms are combined by this bond

5 0

3 years ago