Which process represents a chemical change?(1) melting of ice(2) corrosion of copper(3) evaporation of water(4) crystallization of sugar
Answers
Answer:
Corrosion of Copper is a chemical change.
Explanation:
Copper like Iron when come in contact with moisture and oxygen oxidized and corrodes according to following equation,
4 Cu + O₂ → 2 Cu₂O
This corrosion results in lost of conductivity, strength and luster of copper. As in this reaction two substances i.e Cu and O₂ are reacting to produce a completely new substance i.e. Cu₂O hence, it is declared as chemical change.
The process which represents a chemical change is (2) corrosion of copper.
FURTHER EXPLANATION
Matter may undergo two types of changes: physical or chemical change.
Physical change involves changes in appearance, size, and other physical properties of a substance. There is no change in the composition or identity of the substance. Examples of physical changes are changes of state and change in size.
Chemical changes are changes wherein the composition or identity of the substance is altered. The properties of the substance changes. This involves formation of a new substance due to the rearrangement of atoms. Examples of chemical change are burning and rotting.
- Melting of Ice is a physical change. It is only a state change from solid to liquid.
- Corrosion of copper is a chemical change. A new substance forms when copper is corroded and there is a change in the property of the substance. Copper is a conductor but copper oxide is not.
- Evaporation of water is a physical change. It is a state change from liquid to vapor.
- Crystallization of sugar is a physical change. The composition of sugar remains the same and no new chemical bonds are formed.
LEARN MORE
- chemical and nuclear reaction brainly.com/question/9566647
- rusting brainly.com/question/973790
Keywords: physical change, chemical change
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A pain-relieving pill has a mass of 0.005 g. Express the pill’s mass in grams using scientific notation or in milligrams.
(2) melting and evaporating
(3) condensation and sublimation
(4) condensation and deposition
Answers
Melting and evaporating are the physical changes that are endothermic. Therefore, the correct option is option 2.
Physical modifications are those that modify a chemical substance's shape yet do not affect its chemical content. Physical changes may normally be utilised to separate compounds to chemical elements and simpler compounds, but they cannot be utilised for separate mixtures to their individual components. When something changes physically but not chemically, it is said to have undergone a physical transformation. This contrasts to the idea of a chemical change, when a material's composition changes or a substance or substances mix or separate to generate new compounds. Melting and evaporating are the physical changes that are endothermic.
Therefore, the correct option is option 2.
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stocks
dividends
certificates of deposit
loans
Answers
loans would be the answer
Answer:
loans
Explanation:
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A. Chlorine
B. Sulfur
C. Oxygen
D. None of the above
Answers
Answer:
D. None of the above
Explanation:
All the answer choices listed only have 2-3 items in the electron configuration.
B) erosion by wind and water
C) eruptions by explosive volcanoes
D) cracking of earths crust by earthquakes
Answers
Answers
Answer:
Explanation:
Temperature is also known as the average kinetic energy in a substance.
If there is an absence of heat in a substance, the particles move slower and the kinetic energy decreases. The temperature will be lower, because there is less kinetic energy.
If heat is present or applied, the particles move more, so kinetic energy increases. The temperature will be higher, since there is more kinetic energy.
So, the relationship is: temperature is the measure of average kinetic energy.
Answer:
DIRECT
Explanation:
Answers
The specific heat of liquid ethyl alcohol is 2.42 j/g C and its density of 0.7893 g/ml. The amount of silver used is 12.05 g.
What is specific heat?
Specific heat is defined as the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius.
It can also be defined as the quantity of heat energy necessary to raise a body's temperature per unit of mass.
Specific heat is expressed as
Q = mcΔT
As per the question
Q silver = Q alcohol
= m silver x Co silver x (T f - T silver) = m alcohol x C p alcohol ( T f -T alcohol)
= m silver x 0.24 x (23.5-95) = 25.6 x 0.7893 x 2.42 x (23.5 - 19.27)
= 25.6 x 0.7893 x 2.42 x (23.5 - 19.27) / (-0.24 x (23.5 - 95)
= 12.5 grams
Thus, the specific heat of liquid ethyl alcohol is 2.42 j/g C and its density of 0.7893 g/ml. The amount of silver used is 12.05 g.
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SOLUTION
25.6 (volume) * 0.7893 (density) = mass of the ethyl alcohol
If it was heated to 19.27 degrees Celsius, this translates to 292.27 Kelvin. The specific heat of liquid ethyl alcohol is 2.42 j/(g*C), which is the same as 2.42 j/(g*K), therefore it has in total 2.42 * 292.27 * 25.6 * 0.7893 Joules of heat.
The silver has x grams, and its specific heat is 0.24 J/g*C = 0.24 J/g*K. If it was heated up to 95 degrees, that means it was heated to 368 degrees Kelvin. Therefore it 368 * 0.24 * x Joules of heat.
If the final temperature was 23.5 degrees Celsius of the entire thing, than the ethyl alcohol had 2.42 * 296.5 * 25.6 * 0.7893 Joules of heat. Getting the difference of the first state and the second state, we get 2.42 * (296.5 - 292.27) * 25.6 * 0.7893 Joules. This was added to the silver, which now has 296.5 * 0.24 * x Joules of heat. Subtracting the first state from the second state we get (296.5-368) * 0.25 * x Joules. The absolute value of this equals 2.42 * (296.5 - 292.27) * 25.6 * 0.7893 Joules. Doing all the math out, 206.84155853 = 17.16x.
Therefore x = 12.05 grams.
There are 12.05 grams of silver.