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3 years ago

When a metal such as copper is heated it expands. Explain

Chemistry

1 answer:

exis [7]3 years ago

6 0

Explanation:

When a metal is heated the kinetic energy in the particles increases and hence the force of attraction decreases amongst the particles - as electrons try to escape due to kinetic energy. This causes the metal to expand.

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Describe the pat of a carbon atom through the process of cellular respiration

Fudgin [204]

The glucose moves into the cell via a protein (glucose is hydrophilic) the chain of carbon are broke down from glucose in glycolysis, this takes place in the cytoplasm of the cell

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3 years ago

Two beakers are placed in a small closed container at 25 °C. One contains 284 mL of a 0.296 M aqueous solution of C6H12O6; the s

Katen [24]

Answer:

Final volume = 0.103M x446ml/0.184m = 250ml

Explanation:

As time passes, the volume of solutions in the second beaker decreases and that in the first beaker increases. If we wait long enough, the final volumes and concentration in the beakers would be,

First beaker

Final concentration = 0.184M

Final volume = 0.296M x 284ml/0.184 = 457ml

Second beaker

Final concentration = 0.184M

Final volume = 0.103M x446ml/0.184m = 250ml

6 0

3 years ago

Read 2 more answers

Which phrase is a result of a scientific law? Daryl is a scientist at a research institute. He reviews articles written by other

AleksAgata [21]

Answer: Last week, he accidentally dropped his coffee mug, which then fell on the floor due to gravity.

A scientific law can be defined as a law which followed universally. As a scientific law gives evidences and facts related to a natural phenomena. It is useful in scientific education and research.

Last week, he accidentally dropped his coffee mug, which then fell on the floor due to gravity is an example of law of gravity. The law of gravity states that objects are attracted to each other due to the magnitude of force acting between these objects. The earth exerts it's own gravitational force, to attract the objects towards itself.

8 0

4 years ago

Which statement explains why the bonds between non metals tend to be covalent

ad-work [718]

They have ions that produce an electrostatic pull.
Nonmetallic elements normally form covalent bonds because of their high ionization energies and therefore, strong attraction for their valence electrons

5 0

4 years ago

3750 J of heat were added to sample of magnesium with an unknown mass. If the temperature ofthe sample increased by 23 °C, what

makvit [3.9K]

Taking into account the definition of calorimetry, the mass of the sample is 159.85 grams.

<h3>What is calorimetry</h3>

In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .).

The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

Q is the heat exchanged by a body of mass m.
c is the specific heat substance.
ΔT is the temperature variation.

<h3>Mass of the sample</h3>

In this case:

Q= 3750 J
c= 1.02 $\frac{J}{gC}$
m= ?
ΔT= 23 C

Replacing in the expression to calculate heat exchanges:

3750 J= 1.02 $\frac{J}{gC}$ × m× 23 C

Solving:

m= 3750 J ÷ (1.02 $\frac{J}{gC}$ × 23 C)

<u><em>m= 159.85 grams</em></u>

In summary, the mass of the sample is 159.85 grams.

Learn more about calorimetry:

brainly.com/question/11586486

brainly.com/question/24724338

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6 0

2 years ago