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3 years ago

Brainliest given for an explanation why you think its that answer.

Chemistry

2 answers:

Kryger [21]3 years ago

8 0

Answer:c

Explanation:I think

TEA [102]3 years ago

6 0

Answer:

C. Classify

Explanation:

define classify :arrange a group into categories

this makes the most sense because it matches up with the sentence

for example "classify by eye color"

the green eyes would go together

the blue eyes would go together

the brown eyes go together

etc...

A. is not correct because.....

accuracy:being correct

this doesn't fit the sentence because its not talking about precise anywhere is the sentence given

B.is not correct because......

Critical thinking:Logical explanation

the sentence has nothing to do with thinking nor logic is involved

D is not correct because.....

Matter: physical substance

the sentence is not about science/physics

F is not correct because.....

Bias:Favor against one person

Although this sentence is about different categories based on your attributes it doesn't mention about favorites like "I like this catogory better"

pls mark me brainliest

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How much of a sample remains after five half-lives have occurred?

timama [110]

Answer:

1/32 of the original sample

Explanation:

We have to use the formula

N/No = (1/2)^t/t1/2

N= amount of radioactive sample left after n number of half lives

No= original amount of radioactive sample present

t= time taken for the amount of radioactive samples to reduce to N

t1/2= half-life of the radioactive sample

We have been told that t= five half lives. This implies that t= 5(t1/2)

N/No = (1/2)^5(t1/2)/t1/2

Note that the ratio of radioactive samples left after time (t) is given by N/No. Hence;

N/No= (1/2)^5

N/No = 1/32

Hence the fraction left is 1/32 of the original sample.

3 0

3 years ago

Crude oil pumped out of the ground may be accompanied by formation water, a solution that contains high concentrations of nacl a

djverab [1.8K]

solution:

the change in the boiling point is given as,

dTbp =2.30°c

elevation constant for the solvent is given by,

kb=0.512°c/m

$molality=\frac{dTBP}{KB\times m}\\=\frac{2.30}{0.512c/m}$

= 4.49m

8 0

3 years ago

When an alkaline earth metal, a, reacts with a halogen, x, the formula of the covalent compund formed should be a2x?

Ierofanga [76]

Alkaline earth metal are the elements present in II group in the periodic table and are known as 'Metals' and have a charge of +2.

Alkaline earth metals - Be , Mg Ca, Sr , Ba, Ra

Halogens are present in VII A group in the periodic table and are 'Non-metals' and have a charge of -1.

Halogens - F, Cl, Br, I, At

When Alkaline earth metal (metals) combine with Halogens (non-metals) the compound formed will be ionic compound and the formula of the compound will be based on the charges of the element.

When we write the formula of the ionic compound the charges of the elements get criss crossed.

For example - Mg (Alkaline earth metal) have a charge of +2 and Cl (Halogen) have a charge of -1 and when they combine to form the formula their charges get criss crossed and we will get $Mg_{1}Cl_{2}$ or $MgCl_{2}$