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sladkih [1.3K]
2 years ago
14

Which is best option?

Chemistry
2 answers:
Ilia_Sergeevich [38]2 years ago
7 0
The first option Forsure .
hodyreva [135]2 years ago
5 0

Answer:

D

Explanation:

"Wash thoroughly (15 minutes) with water using nearest deluge shower or hand/spray unit. Remove any overlying clothing that may retain the chemical and prevent thorough washing of the skin. Depending on the chemical, additional medical treatment may be required."

                                            - G oogle

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HELP!!!<br> IF YOU DONT KNOW THE ANSWER THEN PLEASE DONT ANSWER!!
Simora [160]

Answer:

1. melting

2. freezing

5. condensation

6. evaporation

4 0
3 years ago
If 2.60 g of NaBr are dissolved in enough water to make 160. mL of solution, what is the molar concentration of
navik [9.2K]

This problem has two parts; the first one asking for the concentration of NaBr given both its mass and volume and the second one asking for its volume given both mass and concentration. The answers turn out to be 0.158 M and 211 mL.

<h3>Molarity</h3>

In chemistry, the use of units of concentration depends on both the substances to analyze and their amounts. In such a way, for molarity, one needs the following relationship between the moles of solute and volume of solution:

M=\frac{n}{V}

Thus, for the first part of the problem we first calculate the moles in 2.60 g of NaBr via its molar mass:

2.60g*\frac{1mol}{102.89g} =0.0253mol

Next, we convert the 160. mL to L by dividing by 1000 in order to obtain 0.160 L to subsequently calculate the molarity:

M=\frac{0.0253mol}{0.160L}=0.158M

Next, since the moles remain the same and for the second part we are asked for the volume given the concentration, one can solve for the volume so as to obtain:

V=\frac{n}{M} =\frac{0.158M}{0.120mol/L}\\ \\V=0.211L

That in milliliters turns out to be:

V=0.211L*\frac{1000mL}{1L}=211mL

Learn more about molarity: brainly.com/question/10053901

6 0
2 years ago
Plants and animals that survive in their environment reproduce and pass on their genes. In their turn, their offspring that surv
LiRa [457]
It’s called the Evolution
5 0
3 years ago
Read 2 more answers
Statements
allochka39001 [22]

1. Make an observation : My toaster doesn't toast my bread

2. Ask a question : Why doesn't my toaster work?

3. Form a hypothesis : My coffeemaker works when plugged into the outlet

4. Make a prediction : If something is wrong with the outlet, then my coffeemaker also won't work when  plugged into it

5. Conduct an experiment : I plug my coffeemaker into the outlet

6. Analyze the results : There is something wrong with the electrical outlet

Explanation:

The solution to the problem is as shown above.

  • A scientific method follow a methodical way of critically carrying out an inquiry into an observation.
  • Firstly, an observation is usually made with our senses. Here the researcher observes that the toaster does not toast his bread probably after a long wait.
  • He then proceeds to ask why the toaster does not work.
  • To investigate this, the forms a hypothesis. A hypothesis is a scientific guess. It is a tentative proposition about an investigation.
  • The researcher then makes a prediction about the outlet that might be faulty.
  • With this background, he goes on to carry out an experiment to substantiate his findings. This is seen when he plugs the coffeemaker into the outlet.
  • From the analysis of result, he sees that that something is wrong with the outlet.

Learn more:

purpose of experiment brainly.com/question/5096428

#learnwithBrainly

7 0
3 years ago
What is the relative formula mass of N2O? Ar of N = 14 and Ar of O = 16.
s2008m [1.1K]

We have to calculate formula mass of N₂O.

The answer is: 44

Relative formula mass is the sum of relative atomic mass of constituent atoms in a formula unit of any compound.  Relative formula mass is represented as same symbol of relative molecular mass.

To calculate relative formula mass we need to know number of each atom in the formula and then adding atomic masses of all the atoms.

In N₂O, number of N-atom present is equal to 2 and number of O-atom is equal to  1.

Atomic mass of N-atom is 14 and atomic mass of O-atom is 16.

So, formula mass of N₂O is (2 X 14)+16 = 44.

6 0
3 years ago
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