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lesya692 [45]
3 years ago
10

Min : sec helium and nickel are classified as _____, which are pure substances that make up all kinds of matter

Chemistry
1 answer:
Sidana [21]3 years ago
4 0

Helium which has a chemical formula of He is considered as a noble gas while Nickel which has a chemical formula of Ni is considered as metallic. Although both have different phases but they are both classified under the general category of “Elements”.

 

answer:

<span>elements</span>

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If a gas has a volume of 750 mL at 25oC, what would the volume of the gas be at 55oC?
blagie [28]

Answer:

The answer to your question is     V2 = 825.5 ml

Explanation:

Data

Volume 1 = 750 ml

Temperature 1 = 25°C

Volume 2= ?

Temperature 2 = 55°C

Process

Use the Charles' law to solve this problem

                V1/T1 = V2/T2

-Solve for V2

                V2 = V1T2 / T1

-Convert temperature to °K

T1 = 25 + 273 = 298°K

T2 = 55 + 273 = 328°K

-Substitution

                V2 = (750 x 328) / 298

-Simplification

                V2 = 246000 / 298

-Result

                V2 = 825.5 ml

             

7 0
3 years ago
What is the density of a block of gold that occupies 1000 ml and has a mass of 3.5 kg? Show your work
tiny-mole [99]

Answer:

Density of block of gold is <em>3.5 g/cm³.</em>

Explanation:

Given data:

Volume of block = 1000 mL

Mass of block = 3.5 kg (3.5×1000 = 3500 g)

Density of block = ?

Solution:

Density of substance is calculated by dividing the mass of substance over its volume.

Formula:

d = m/v

d = 3500 g/ 1000 mL

d = 3.5 g/mL

or

d = 3.5 g/cm³             (1ml = 1cm³)

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False is the answer

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Celery stalks that are immersed in fresh water for several hours become stiff and hard. similar stalks left in asalt solution be
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Plasmolysed because of osmosis as the salt solution has lower water potential than the cells of the stalk
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kondor19780726 [428]
2.167*10^22 atoms of hydrogen
4 0
3 years ago
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