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Over [174]
1 year ago
10

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is fl

ammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood. Benzoyl chloride is a lachrymator.
Chemistry
1 answer:
Flauer [41]1 year ago
5 0

Explanation:

Dichloromethane is flammable -  FALSE

Methanol is flammable. - TRUE

Concentrated sulfuric acid is corrosive.  - TRUE

10% sodium carbonate solution must be used in the fume hood. - FALSE

Benzoyl chloride is a lachrymator. - TRUE

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A solution is prepared by adding 100 mL of 1.0 M HC2H3O2 (aq) to 100 mL of 1.0 M NaC2H3O2 (aq). The solution is stirred and its
DIA [1.3K]

Answer:

(C) H3O+(aq) + C2H3O2−(aq) -> HC2H3O2(aq) + H2O(l)

Explanation:

A buffer is a solution of a weak acid and its salt. It mitigates against changes in acidity or alkalinity of a system. A buffer maintains the pH at a constant value by switching the equilibrium concentration of the conjugate acid or conjugate base respectively.

Addition if an acid shifts the equilibrium position towards the conjugate acid side while addition of a base shifts the equilibrium position towards the conjugate base side.

5 0
2 years ago
HgS + O2 → HgO + SO2
Igoryamba

Answer:

2HgS + 3O2 → 2HgO + 2SO2

The coefficients are: 2, 3, 2, 2

Explanation:

HgS + O2 → HgO + SO2

The equation can be balance as follow:

Put 3 in front of O2 as shown below:

HgS + 3O2 → HgO + SO2

Now we can see that there are 6 atoms of O on the left side of the equation and a total of 3 atoms on the right side. It can be balance by putting 2 in front of HgO and SO2 as shown below:

HgS + 3O2 → 2HgO + 2SO2

Now we have 2 atoms of both Hg and S on the right side and 1atom each on the left. It can be balance by putting 2 in front of HgS as shown below:

2HgS + 3O2 → 2HgO + 2SO2

Now the equation is balanced.

The coefficients are: 2, 3, 2, 2

The law of conservation of mass(matter) states that matter(mass) can neither be created nor destroyed during a chemical reaction but changes from one form to another. An unbalanced equation suggests that matter has been created or destroyed. While a balanced equation proofs that matter can never be created but changes to different form. This is the more reason we have count the atoms of an element on both side of the equation to see if they are balanced irrespective of the new form they assume in the product

5 0
1 year ago
Describe, in detail, to a freshman undergraduate how to make 1 liter of LB + Kan (100 μg/ml final concentration) + Amp (50 μg /m
mario62 [17]

Answer:

Explanation:

The objective here is to prepare  1 liter of LB + Kan (100 μg/ml final concentration) + Amp (50 μg /ml final concentration) liquid media.

Given that :

the Stock concentration of Amp: 100 mg/ml (since 1 mg/ml = 1000 μg/ml)

it is required that we convert stock concentration in  μg/ml since 100 mg/ml = 100000  μg/ml

However, using formula C₁V₁=C₂V₂ (Ampicilin),

where:

C₁ = 100000 μg/ml,

V₁=?,

C₂= 50  μg/ml,

V₂=1000 ml

100000 μg/ml × V₁ = 50  μg/ml × 1000 ml

V₁ =  50  μg/ml × 1000 ml/100000 μg/ml

V₁ =   0.5 ml

Given that:

the Stock concentration of Kan: 25 mg/ml (since 1 mg/ml = 1000 μg/ml)

it is required that we convert stock concentration in  μg/ml , 25 mg/ml = 25000 μg/ml

Now by using formula C₁V₁=C₂V₂ (Kanamycin),

C₁ = 25000 μg/ml,

V₁=?,

C₂= 100  μg/ml,

V₂=1000 ml

25000 μg/ml × V₁ = 100  μg/ml × 1000 ml

V₁ =  100  μg/ml × 1000 ml/25000 μg/ml

V₁ =   4 ml

Thus; in 1 lite of Lb+ Kan+Amp preparation;

0.5 ml of Amp & 4 ml of kanamycin is used for their stock preparation.

Finally;

Sterilization step should be carried out in flask (Clean dry glass wares) for media in an autoclave, the container size should be twice the volume of media which is prepared.

5 0
2 years ago
A racing car travels 340 miles in 120 minutes. what speed is traveling at?
Papessa [141]

Answer:

It is traveling at 170 miles per hour.

Explanation:

divide 340 by 2 because right now it's at 340 miles per two hours.

You get 170 miles per hour.

4 0
1 year ago
•You have 560. mL of aluminum hydroxide, with a molarity of 0.0300 M. When mixed with 871 mL of hydrochloric acid, what is the m
Liono4ka [1.6K]

<u>Answer:</u>

<u>For 1:</u> The molarity of acidic solution is 0.579 M

<u>For 2:</u> The volume of acidic solution is 0.0153 L

<u>Explanation:</u>

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base

  • <u>For 1:</u>

We are given:

n_1=1\\M_1=?M\\V_1=871mL\\n_2=3\\M_2=0.030M\\V_2=560mL

Putting values in above equation, we get:

1\times M_1\times 871=3\times 0.0300\times 560\\\\M_1=\frac{3\times 0.0300\times 560}{1\times 871}=0.579M

Hence, the molarity of acidic solution is 0.579 M

  • <u>For 2:</u>

We are given:

n_1=3\\M_1=0.488M\\V_1=?L\\n_2=2\\M_2=0.320M\\V_2=35.1mL=0.0351L

Putting values in above equation, we get:

3\times 0.488\times V_1=2\times 0.320\times 0.0351\\\\V_1=\frac{2\times 0.320\times 0.0351}{3\times 0.488}=0.0153L

Hence, the volume of acidic solution is 0.0153 L

8 0
2 years ago
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