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scoundrel [369]
2 years ago
12

What does the term "compound" mean? two or more substances dispersed in one another but each retaining their own identity. two o

r more elements joined together such that the elements have lost their individual identity in favor of a new set of properties. a change in shape, size, or physical characteristics but remaining the same substance.
Chemistry
2 answers:
GarryVolchara [31]2 years ago
4 0
I believe it's the second option. 2 or more elements joined together such that the elements have lost their individual identity in favour of a new set of properties.
Ksju [112]2 years ago
3 0

Answer: Option (b) is the correct answer.

Explanation:

When two or more different atoms are bonded together either by sharing or donating electrons then it results in the formation of a new product which exhibit different properties as compared to its parent atoms. This new product is known as compound.

For example, 2Na^{+} + CO^{2-}_{3} \rightarrow Na_{2}CO_{3}

Therefore, Na_{2}CO_{3} will have different properties as compared to sodium and carbonate ions.

Thus, we can conclude that the term "compound" mean two or more elements joined together such that the elements have lost their individual identity in favor of a new set of properties.

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5) Calculate the molality of 0.210 mol of KBr dissolved in 0.075kg pure<br> water?
Margaret [11]

Answer:

\boxed {\boxed {\sf 2.8 \ m }}

Explanation:

The formula for molality is:

m=\frac{moles \ of \ solute}{kg \ of \ solvent}

There are 0.210 moles of KBr and 0.075 kilograms of pure water.

moles= 0.210 \ mol \\kilograms = 0.075 \ kg

Substitute the values into the formula.

m= \frac{ 0.210 \ mol }{0.075 \ kg}

Divide.

m= 2.8 \ mol/kg= 2.8 \ m

The molality is <u>2.8 moles per kilogram</u>

5 0
2 years ago
One of the radioactive isotopes used in medical treatment or analysis is chromium-51. The half-life of chromium-51 is 28 days. H
Goryan [66]

Answer : The time required for decay is, 84 days.

Explanation :

Half-life of chromium-51 = 28 days

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{28\text{ days}}

k=0.0248\text{ days}^{-1}

Now we have to calculate the time required for decay.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = time taken by sample = ?

a = let initial activity of the sample = 100

a - x = amount left after decay process  = 12.5

Now put all the given values in above equation, we get

t=\frac{2.303}{0.0248}\log\frac{100}{12.5}

t=83.9\text{ days}\approx 84\text{ days}

Therefore, the time required for decay is, 84 days.

7 0
3 years ago
Please help me on this.
Anika [276]
True will end up being the answer
6 0
2 years ago
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Yo what is the moon phases​
Fynjy0 [20]

Answer:

New Moon, First Quarter, Full Moon, Last Quarter, Waxing Crescent, Waxing Gibbous, Waning Gibbous, and Waning Crescent.

8 0
2 years ago
Read 2 more answers
What is formed when hydrobromic acid, hbr, and calcium hydroxide, ca(oh)2, are combined?
Lorico [155]

This is an acid – base reaction and this always result a salt and water in a neutralization reaction. <span>

The salt that is formed will be calcium bromide (calcium is located in group 2 so calcium bromide has a formula of CaBr2) 

so essentially we got:

HBr + Ca(OH)2 ------> CaBr2 + H2O </span>

balancing the elements: <span>

<span>2HBr(aq) + Ca(OH)2(aq) --------> CaBr2(aq) + 2H2O(l)</span></span>

6 0
2 years ago
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