A scientist is using a lithium ion battery to power her laptop. Which statement about the battery is correct?(1 point)
Responses
Lithium atoms are created as the battery recharges.
Lithium atoms are created as the battery recharges.
Electrons are lost to the environment when the battery is used.
Electrons are lost to the environment when the battery is used.
A new substance is formed as the battery is used.
A new substance is formed as the battery is used.
The mass of the battery increases when it is recharged.
The mass of the battery increases when it is recharged.
A scientist is using a lithium ion battery to power her laptop. Which statement about the battery is correct?(1 point)
Responses
Lithium atoms are created as the battery recharges.
Lithium atoms are created as the battery recharges.
Electrons are lost to the environment when the battery is used.
Electrons are lost to the environment when the battery is used.
A new substance is formed as the battery is used.
A new substance is formed as the battery is used.
The mass of the battery increases when it is recharged.
Electrons are lost to the environment when the battery is used.
Use the chemical reaction to answer the question.
2H2O2→2H2O +O2
Which statement about the reaction is correct?
(1 point)
Responses
Atoms of H2 and O2 are lost during the reaction.
Atoms of H 2 and O 2 are lost during the reaction.
The reaction creates new atoms of H2O and O2.
The reaction creates new atoms of H 2 O and O 2 .
H2O2 has the same properties as H2O and O2.
H 2 O 2 has the same properties as H 2 O and O 2 .
The H2O and O2 produced have the same mass as the original H2O2.
The H2O and O2 produced have the same mass as the original H2O2.
Suppose 20 atoms of hydrogen (H) react with chlorine (Cl) to produce 20 molecules of hydrochloric acid (HCl). According to the law of conservation of matter, how many atoms of chlorine reacted with the hydrogen?(1 point)
Responses
20
20
10
10
0
0
40
10
Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct?(1 point)
Responses
The model should show 27 protons and 27 neutrons.
The model should show 27 protons and 27 neutrons.
The model should show 27 protons and 32 neutrons.
The model should show 27 protons and 32 neutrons.
The model should show 59 protons and 27 neutrons.
The model should show 59 protons and 27 neutrons.
The model should show 32 protons and 59 neutrons.
The model should show 27 protons and 32 neutrons.
To answer this question, we need to understand how a lithium-ion battery works. A lithium-ion battery consists of a positive electrode (cathode), negative electrode (anode), and an electrolyte solution.
During the discharge process, lithium ions (Li+) move from the anode to the cathode through the electrolyte, while electrons flow through an external circuit to power the device. This movement creates an electric current that can be used to power a laptop or other electronic devices.
When the battery is recharged, the process is reversed. The lithium ions move back to the anode, and electrons flow in the opposite direction to store energy in the battery.
Based on this explanation, we can determine that the correct statement about the battery is:
The mass of the battery increases when it is recharged.
This is because during the recharge process, lithium ions move from the cathode back to the anode, which increases the mass of the anode. The overall mass of the battery increases as it stores more lithium ions. Therefore, the correct statement is that the mass of the battery increases when it is recharged.