The reason copper coins dull in the first place, is because copper reacts with oxygen in the air and form a layer of copper oxide which is a dull greenish-grey colour. When you mix the salt (sodium chloride) with the vinegar (acetic acid) you form Sodium acetate and Hydrogen chloride.
Answer:
Explanation:
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In this case, since the molarity is computed by the division of the moles of the solute by the volume of the solution in liters:
We first compute the moles of glucose (molar mass 180 g/mol) as shown below:
Therefore, the molarity turns out:
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<u>Answer:</u> The net ionic equation is written above
<u>Explanation:</u>
Net ionic equation of any reaction does not include any spectator ions.
Spectator ions are defined as the ions which does not get involved in a chemical equation. They are found on both the sides of the chemical reaction when it is present in ionic form.
The chemical equation for the reaction of lead (II) nitrate and potassium sulfate is given as:
Ionic form of the above equation follows:
As, potassium and nitrate ions are present on both the sides of the reaction. Thus, it will not be present in the net ionic equation and are spectator ions.
The net ionic equation for the above reaction follows:
Hence, the net ionic equation is written above.
Answer:
- <em>If a piece of iron were placed close to this device, the iron nail would move toward the piece of iron.</em>
Explanation:
The description of the built device corresponds to a temporal electromagnet: as long as the battery is connected and supplying the potential difference (voltage) the iron nail will have magnet properties.
Since magnets attract and are attracted to iron, the iron nail and the piece of iron would feel attracted to each other.
The question is confusing because it asks what would happen to a piece of iron if it were placed close to this device, but it should be what happens to the iron nail if a piece of iron were placed close to this device.
Then, assuming the iron nail is free to move it would move toward the piece of iron due to the electromagnetic force.