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irakobra [83]
3 years ago
7

A 10% (v/v) methanol solution can be made by adding _________ of methanol to _________ of water, while a 10% (m/m) methanol solu

tion can be made by adding _________ of methanol _________ of water.a. 10 mLb. 90 mLc. 90 gd. 100 ge. 100 mLf. 10 g
Chemistry
1 answer:
dolphi86 [110]3 years ago
3 0

Answer:

A 10% (v/v) methanol solution can be made by adding 10 mL of methanol to 100 mL of water, while a 10% (m/m) methanol solution can be made by adding 10 g of methanol to 90 g of water

Explanation:

This percents are a sort of concentrations:

v/v means volume of solute in 100 mL of solution

m/m means mass of solute in 100 g of solution

Certainly in solutions that can be made by two liquids, we don't consider additive, the volumes.

In m/m, as the percent are the grams of solute in 100 g of solution, we consider the mass of water (generally the solvent) as 100 g - x % of solute

Mass of solution = Mass of solvent + Mass of solute

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Explain how a cold compress used by
Fynjy0 [20]

Answer: A cold compress used by  athletes is an endothermic reaction.

Explanation:

A pack of cold compress used by athletes contains water that holds another bag or tube inside it which is filled with ammonium nitrate fertilizer.

So, on hitting the cold compress the tube breaks down due to which fertilizer gets mixed with water. This mixture absorbs the heat when placed on the area of body having pain, strain or bump.

As a result, we tend to feel cold at the affected area of our body.

Thus, we can conclude that a cold compress used by  athletes is an endothermic reaction.

7 0
3 years ago
write a correct and complete nuclear equation for the alpha decay of a parent atom having 102 protons and 167 neutrons useing th
scZoUnD [109]
Alpha partical is a He nucleus. When decaying alpha particle mass is reduced by 4 and atomic number is reduced by 2.

The actual element which has 102 protons is No (Nobelium). 
Since it has 167 neutrons, the mass = protons + neutrons = 102 + 167 = 269

after an alpha decay, the new element formed has 100 protons which is Fm ( Fermium)

the alpha decaying equation is,

    ₁₀₂²⁶⁹No → ₁₀₀²⁶⁵Fm + ₂⁴α + heat

the total mass and the atomic number( numbe rof protons) must be equal in both sides.




5 0
3 years ago
A 30.00 mL sample of HBr was titrated using 0.1756 M NaOH. Determine the concentration of the HBr sample if 17.52 mL of NaOH was
postnew [5]

<u>Answer:</u> The concentration of HBr sample is 0.1025 M

<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 which is HBr

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

We are given:

n_1=1\\M_1=?M\\V_1=30.00mL\\n_2=1\\M_2=0.1756M\\V_2=17.52mL

Putting values in above equation, we get:

1\times M_1\times 30.00=1\times 0.1756\times 17.52\\\\M_1=\frac{1\times 0.1756\times 17.52}{1\times 30.00}=0.1025M

Hence, the concentration of HBr sample is 0.1025 M

5 0
3 years ago
Scientific endeavor must be driven by the needs of society and not by simple curiosity. true false
vazorg [7]
False people can do whatever they want without people telling them what to do.
5 0
3 years ago
An endothermic process is one in which heat is ________ from the surroundings. (2 points)
Marina CMI [18]
The answer is 1) gained
Always <span><span>think "into" for "endo" (energy goes in), and "exit" for "exo" (energy is released).</span> </span>

Hope it helps ^-^

7 0
3 years ago
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