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What is the mass of a piece of copper that undergoes a 25 degrees C temp change with the loss of 428 J of energy?
q = mass * specific heat * change in temperature 428 joules = (mass)(0.385 J/gC)(25o C) = 44 grams copper ============
When you cut a Copper wire for wires in half in half is it example of what change?
Cutting a copper wire in half is an example of a physical change. This is because the process alters the wire's size and shape but does not change its chemical composition or properties. The copper atoms remain intact, and the material can still conduct electricity just as it did before being cut.
Why did the composition in pennies change between 1981 and 1982?
because in 1982 there was a war going on and copper was short and they needed copper for their weapons so they stoped using copper for the so called "penny" and used zinc instead but they still used a copper collered coating. :) hope this helped because in 1982 there was a war going on and copper was short and they needed copper for their weapons so they stoped using copper for the so called "penny" and used zinc instead but they still used a copper collered coating. :) hope this helped
What is the function of tartrate in the fehling test?
In the Fehling test, tartrate serves as a stabilizing agent for the copper(II) ions in Fehling's solution. It prevents the precipitation of insoluble copper salts, allowing the copper(II) ions to remain in a soluble form. This enables the test to effectively detect reducing sugars, which reduce the copper(II) ions to copper(I) oxide, resulting in a characteristic color change.
is it construct two wires of the same length one of copper and one of iron that would have the same resistance at the same temperature?
Yes, it is possible to construct two wires of the same length, one of copper and one of iron, that have the same resistance at the same temperature. The resistance of a wire is determined by its resistivity, length, and cross-sectional area, as given by the formula ( R = \frac{\rho L}{A} ). Since copper has a lower resistivity than iron, the copper wire would need a larger cross-sectional area than the iron wire to achieve the same resistance.
What temperature does copper change from a solid to a liquid?
120.3 deg.c
How does the amount of copper chloride affect the temperature of the reaction?
The amount of copper chloride in a reaction can affect the temperature by influencing the rate of the reaction. Adding more copper chloride can increase the rate of reaction, leading to a faster rise in temperature. Conversely, reducing the amount of copper chloride can slow down the reaction and result in a lower temperature change.
What is the amount of energy in hot copper?
The amount of energy in hot copper is determined by its temperature and mass. This energy is typically measured in joules (J) or calories (cal). The energy content can be calculated using the specific heat capacity of copper and the change in temperature.
Copper is added to a solution of nitric acid The solution becomes hot and changes from colorless to dark blue What is the best explanation for the change in temperature?
The change in temperature is likely due to an exothermic reaction between copper and nitric acid, resulting in the release of heat. The change in color to dark blue may be due to the formation of copper nitrate in the solution.
Three things that you observe in a chemical change of mixture Mg-CuSO4?
Formation of a new substance: When magnesium reacts with copper sulfate, the blue color of copper sulfate fades as copper metal is formed, indicating a chemical change has occurred. Release of gas: In this reaction, bubbles of gas may be observed, which could be hydrogen gas being evolved as magnesium displaces copper from copper sulfate. Temperature change: The reaction between magnesium and copper sulfate is exothermic, meaning it releases heat. The mixture may feel warm or hot to touch during the reaction, indicating a temperature change has taken place.
Is heating copped pan in the oven a chemical change?
Heating a copper pan in the oven does not result in a chemical change; it primarily involves a physical change. The temperature increase may cause the copper to expand and change its physical state, but the chemical composition of the copper remains the same. A chemical change would involve a transformation that alters the molecular structure, such as oxidation or reacting with another substance. In this case, the copper remains copper, regardless of the heat applied.
What substance would absorb the most heat energy with the least change in temperature water or copper?
Copper would absorb more heat energy with less change in temperature compared to water due to its higher specific heat capacity. This means that copper can absorb more heat per unit mass before its temperature noticeably increases, while water's temperature would rise more easily when absorbing heat.
What is copper's phase at room temperature?
Copper is a solid at room temperature.
Why heating copper wire in the presence of air at high temperature a chemical change Why?
Heating copper wire in the presence of air at high temperatures causes a chemical change because it leads to the oxidation of copper. When exposed to oxygen, copper reacts to form copper oxide, resulting in a new substance with different properties. This transformation involves a rearrangement of atoms and bonds, characteristic of a chemical change, as opposed to a physical change where the substance remains the same.
How does the change of temperature affect the rate of solubility in copper sulphate?
An increase in temperature generally increases the solubility of copper sulfate in water, as higher temperatures provide more energy to break apart the bonds holding the copper sulfate molecules together. This can result in more copper sulfate dissolving in the water at higher temperatures.
What is the colour of copper sulphate at room temperature?
the copper sulphate i used at room temperature was blue.
Is liquid at room temperature physical property of copper?
No. Copper is a solid at room temperature.
