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Fittoniya [83]
3 years ago
15

PLEASE HELP!! WILL GIVE YOU BRAINLIEST!!

Chemistry
1 answer:
ArbitrLikvidat [17]3 years ago
5 0

Answer:

In a chemical formula, the symbols for each element in the compound are followed by subscripts that tell us how many of that element are in the compound. The subscripts that follow each element's symbol indicate how many of that element are in the compound.

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Since I'm a tomboy, does that mean I'm gender non-conforming?
Evgesh-ka [11]
I guess so? ur basically just breaking gender roles/ stereotypes. do what makes u happy :p
3 0
3 years ago
It took 70 seconds for 280cm³ of nitrogen to diffuse through a membrane. If Carbon(IV)Oxide is allowed to diffuse through the sa
Romashka-Z-Leto [24]

Answer:

t = 125.3 seconds

Explanation:

Molar mass of CO2 = 12+2(16) = 66

Molar mass of N2 = 2(14)= 28

rate of diffusion of N2 = volume/ time = 280cm³/70s

= 4cm³/s

let rate of CO2 = rate of diffusion of CO2 = volume/time

= 400/t

Using Graham's law of diffusion,

rN2/rCO2 = √M(CO2)/M(N2)

4/400/t =√44/28 = 4t/400= √11/7

t/100 = 1.253 , t= (100)(1.253)

t = 125.3 seconds

hence it takes CO2 125.3 seconds to diffuse through the membrane

5 0
3 years ago
In an endothermic reaction...
kondaur [170]

Answer:

to hard im only in year 8

Explanation:

6 0
3 years ago
Read 2 more answers
The valency of both Oxygen and magnesium is 2 give reason <br><br>​
lidiya [134]

Answer:

<em>the <u>valency of an element</u> is its combining capacity that is the number of electrons it requires to lose, gain or share in order to become neutral.</em>

[ An element can become neutral if it completes it's octet. That is if an element has 8 electrons in it'd outermost shell then it is considered neutral ]

  • The valence of Magnesium is 2 because it requires to lose 2 electrons to become neutral.

  • whereas, the valence of Oxygen is 2 because it needs to gain 2 electrons to become stable.

Hence they both have the same valence.

One may say that oxygen's valence is -2 while that of Magnesium is + 2. It's meaning is still the same but "-" sign indicates that oxygen will be gaining electrons in the process of becoming stable.

7 0
3 years ago
What is the morality of a solution made with 0.88 moles of KCl and 2.0 L of water?
Anarel [89]

Answer:

M=0.44M

Explanation:

Hello,

In this case, the molarity is defined as the ratio of the moles of the solute to the volume of the solution in liters:

M=\frac{n_{solute}}{V_{solution}}

In this case, the solute is the KCl (potassium chloride) and the solution is made up of both water and KCl. Moreover, since during this type of dissolution processes, the volume of the solution is not significantly affected by the addition of the solute, the resulting molarity is:

M=\frac{0.88mol}{2.0L}\\ \\M=0.44M

Best regards.

4 0
3 years ago
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