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german
3 years ago
15

A b c or d ..........​

Chemistry
2 answers:
GarryVolchara [31]3 years ago
8 0

Answer:

B

Explanation:

Radiation from ultraviolet rays can cause vision problems and sunburn.

Galina-37 [17]3 years ago
6 0
I would say B... ultraviolet rays cause sun burns
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Tasya [4]

Answer:

B the rides are to the sun

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PLEASE HELP ME!!!! WILL GIVE BRAINLIEST!!!!
vitfil [10]

Answer: 1. 3.23 m

2. 32.4

3. B  adding solvent  and C  removing solute

Explanation:

1. Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent

Molality=\frac{n}{W_s}

where,

n = moles of solute

W_s = weight of solvent

Now put all the given values in the formula of molality, we get

Molality=\frac{43.6mol}{13.5kg}=3.23mol/kg

2. Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n}{V_s}

where,

n = moles of solute

V_s = volume of solution in L

3.4=\frac{n}{9.54}

n=32.4

Therefore, the moles of Na_2CO_3 is 32.4

3. Molarity can be decreased by decreasing the moles of solute and by increasing the volume of solution.

Thus adding solvent  and removing solute will decrease the molarity.

4 0
3 years ago
An object has a density of 16.3 g/mL and a volume of 0.46 L. Calculate the
deff fn [24]

Answer:

16.53 pounds

Explanation:

this type of problem needs convertion method we need to convert from grams to pound.

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3 years ago
a helium balloon has a volume of 2.95 liters at 25 c. the volume of the ballon decreased to 2.25 l after it is placed outside on
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Answer:

The outside temperature is -45.8°C

Explanation:

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227.2K - 273 = -45.8°C

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4 years ago
What is a characteristic of every combination reaction?
Scilla [17]
A combination reaction<span> is a </span>reaction<span> in which two reactants combine to form one product. It is also called a synthesis reaction. A characteristic to this type of reaction would be that there would always be only one product. Hope this answers the question. Have a nice day. </span>
7 0
3 years ago
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