a clerk can sort 7 papers/minute. if there are 225 papers in an inch, how many hours will it take her to sort 125 inches of loose apper

Answers

Answer 1

Answer: Well if there is 225 lose papers to a single inch in order to find out how many loose papers the clerk has all together we will have to multiply 125 x 225.

125 x225 = 28125

The clerk has to sort 28125 papers in total.

Now she can sort 7 papers in a minute so now we divide 28125 by 7.

28125/7 = a rough estimate of 4018 minutes

The clerk will take about 66 hours and 58 minutes

Or 67 hours if you want to estimate

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Why didn't scientists know about atoms for a long time

Answers

they didnt have a powerfull enough microscope to see them an when they could they were moving to fast unless they were cold

The oxygen side of a water molecule is _____.neutral
slightly negative
slightly positive

Answers

Answer is "slightlynegative".

Explanation

In water molecule, there are 3 atoms which belonged to 2 elements. They are 2 Hatoms and 1 O atom. Oxygen atom is more electronegative than H atom. Hence,Oxygen atom in the water molecule gets a slightly negative chargeon it.

What is electronegativity?

Electronegativity is a value that tells us how an atom can attract electronstowards itself.
It helps us to tell the nature of molecule (as polar or non-polar) and thenature of the bond between atoms (as ionic or covalent).
If the electronegativity is high, then the attraction to the electrons is highunless the attraction to the electrons is low.
If the attraction towards electrons is high, then that atom gains a negativecharge on it.

Answer:

The correct answer is: B

Explanation:

slightly negative

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what volume of a 0.716 m kbr solution is needed to provide 25.5 g of kbr? 35.7 ml 14.7 ml 299 ml 0.299 ml 153 ml

Answers

Answer:

$\huge{ \boxed{299 \: ml}}$

Explanation:

The volume of KBr required can be found by using the formula;

$v = (m)/(M * c)$

c is the concentration in M , mol/dm³ or mol/L

v is the volume in L or dm³

m is the mass in grams

M is the molar mass in g/mol

From the question;

m = 25.5 g

c = 0.716

Molar mass (M) of KBr = 39 + 79.9 = 118.9 g/mol

$\therefore \: v = (25.5)/(118.9 * 0.716) \n = 0.299 \: l \n \n \text{but} \: 1 \: l \: = 1000 \: ml \n \therefore0.299l \: = (0.299)/(1) * 1000 \: ml \n = 299 \: ml \n \therefore \: v = 299 \: ml$