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3 years ago

Which description applies to a physical property? Choose the correct answer

Chemistry

1 answer:

choli [55]3 years ago

6 0

Answer:

the third one, measured or observed without changing the identity and composition of matter. because physical property does not under go any change but can be put back.

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The process by which DNA makes a complete copy of itself is called ?

Mekhanik [1.2K]

The process by which DNA makes a complete copy of itself is called Replication

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3 years ago

Before Mendeleev, Newland observed a distinct pattern in the elements and proposed the law of octaves. What were his conclusions

zhuklara [117]

WHILE ARRANGING THE ELEMENTS, NEWLAND OBSERVED THAT ORDER HE SET WERE LIKE NOTES REPRESENTED AS THE SIGNS,THAT IS, EVERY FIRST NOTE IS EQUAL TO THE EIGHT ELEMENT, BUT HE COULD FIND ONLY 58 ELEMENTS THAT WERE CORRECTLY ORDERED IN HIS TABLE

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3 years ago

Read 2 more answers

How many atoms are in a sample of 72.8 grams calcium ?

MArishka [77]

First find the moles
moles of the calcium= 72.8 / 40
moles of calcium in 72.8g = 1.82mol

number of atoms= moles x Avogadro constant
atoms = 1.82 x 6.02x10+23
so the number of atoms is 1.096x10+24

6 0

3 years ago

A student has two solutions of a substance. Solution-1: 25M, 400mL, and Solution-2: 30M, 300 ml. What is the molarity of the fin

castortr0y [4]

Answer:

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

Explanation:

Yo know:

Solution-1: 25M, 400mL
Solution-2: 30M, 300 mL

Molarity being the number of moles of solute per liter of solution, expressed by:

$Molarity (M)= \frac{number of moles}{volume}$

You can determine the number of moles that are mixed from each solution as:

Number of moles= Molarity*Volume

So, being 1 L=1000 mL, for each solution you get:

Solution-1: being 0.400 L=400 mL ⇒ 25 M* 0.400 L= 10 moles
Solution-2: being 0.300 L=300 mL ⇒ 30 M* 0.300 L= 9 moles

When mixing both solutions, it is obtained that the volume is the sum of both solutions:

Total volume= volume solution-1 + volume solution-2

and the number of total moles will be the sum of the moles of solution-1 and solution-2:

Total moles= moles of solution-1 + moles of solution-2

So the molarity of the final solution is:

$Molarity (M)= \frac{moles of solution 1 + moles of solution 2}{Volume solution 1 + Volume solution 2}$

In this case, you have:

moles of solution-1: 10 moles
moles of solution-2: 9 moles
volume solution-1: 0.400 L
volume solution-2: 0.300 L

Replacing:

$Molarity (M)=\frac{10 moles + 9 moles}{0.400 L + 0.300 L}$

Solving:

$Molarity (M)=\frac{19 moles}{0.700 L}$

Molarity= 27.14 $\frac{moles}{L}$

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

4 0

3 years ago

Qué volumen ocupan 5 moles de un gas que se encuentran a 28°C y 3 atm de presión?

lys-0071 [83]

What volume do 5 moles of a gas occupy at 28 ° C and 3 atm of pressure?

<h3>Further explanation</h3>

In general, the gas equation can be written

$\large {\boxed {\bold {PV = nRT}}}$

where

P = pressure, atm

V = volume, liter

n = number of moles

R = gas constant = 0.08206 L.atm / mol K

T = temperature, Kelvin

n= 5 moles

T=28 +273=301 K

P=3 atm

The volume of the gas :

$\tt V=\dfrac{nRT}{P}\\\\V=\dfrac{5\times 0.082\times 301}{3}\\\\V=\boxed{\bold{41.136~L}}$

5 0

3 years ago