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2 years ago

A scientist is attempting to identify an unknown substance. The mass is

Chemistry

1 answer:

Len [333]2 years ago

8 0

Taking into account the definition of density, the density if the unknown substance is 0.8345 g/mL.

<h3>Density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

<h3>Density of the unkown substance</h3>

In this case, you know that:

Mass= 2.42 g
Volume of water= 25 mL
Volume of water + unknown substance= 27.9 mL
Volume of unknown substance= Volume of water + unknown substance - Volume of water= 27.9 mL - 25 mL= 2.9 mL

Replacing in the definition of density:

density= mass÷ volume of unkown substance

density= 2.42 g÷ 2.9 mL

Solving:

<u><em>density= 0.8345 g/mL</em></u>

In summary, the density if the unknown substance is 0.8345 g/mL.

Learn more about density:

brainly.com/question/952755

brainly.com/question/1462554

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The force of attraction between one polar molecule and another polar molecule is

Keith_Richards [23]

Answer:

Dipole-dipole forces

Explanation:

A polar compound is that compound which contains atoms that have a difference in charges i.e electrostatic attraction occurs between its constituent atoms. Polar molecules are attracted to other polar molecules with opposite charges and her held together with the aid of certain forces

The attractive force between the negative part of a polar molecule (-) and the positive part of another polar molecule (+) is called DIPOLE-DIPOLE FORCES. This dipole-dipole force gets stronger with an increasing polarity of the molecules involved.

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3 years ago

If you are playing tug of war with your friend and you move your friend 3 meters using a force of 5 N, How much work did you do?

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Answer: Work was 15 Joules

Explanation: Work W = force F · distance s

W = 5 N · 3 m

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3 years ago

Balance the equation <br><br> __Ni(CIO)3 → _NiCl2+ _02

lora16 [44]

The answer is 1, 1 , 1 because that will balance out the equation and make them equal

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3 years ago

The quantities 1 mol and 22.4 L can be used in conversion factors that change moles to volume and volume to moles at STP.

Luden [163]

True. Bc 1 mol and 22.4 L=23.4

6 0

3 years ago

Read 2 more answers

A sample of argon gas (molar mass 40 g) is at four times the absolute temperature of a sample of hydrogen gas (molar mass 2 g).

katen-ka-za [31]

Answer:

Ratio of Vrms of argon to Vrms of hydrogen = 0.316 : 1

Explanation:

The root-mean-square speed measures the average speed of particles in a gas, and is given by the following formula:

Vrms = $\sqrt{3RT/M}$

where R is molar gas constant = 8.3145 J/K.mol, T is temperature in kelvin, M is molar mass of gas in Kg/mol

For argon, M = 40/1000 Kg/mol = 0.04 Kg/mol, T = 4T , R = R

Vrms = √(3 * R *4T)/0.04 = √300RT

For hydrogen; M = 1/1000 Kg/mol = 0.001 Kg/mol, T = T, R = R

Vrms = √(3 * R *T)/0.001 = √3000RT

Ratio of Vrms of argon to that of hydrogen = √300RT / √3000RT = 0.316

Ratio of Vrms of argon to that of hydrogen = 0.316 : 1

4 0

4 years ago