Look at the information on the element box below to answer the following questions.
30
Zinc
65.39
1. Atomic Number =
2. Atomic Mass =
3. Number of Protons -
4. Number of Neutrons =
5. Number of Electrons
1. Atomic Number = 30
2. Atomic Mass = 65.39
3. Number of Protons = 30
4. Number of Neutrons = The atomic mass (65.39) minus the atomic number (30) gives us 35.39, so there are approximately 35 neutrons.
5. Number of Electrons = In a neutral atom, the number of electrons is equal to the number of protons, so there are 30 electrons.
Element
Argon
Chlorine
Helium
Nitrogen
Zinc
Symbol
Ar
CI
He
N
Zn
Based on its location on the partial periodic table shown above, which element would you predict has chemical properties that are most similar to argon (Ar)?
A Chlorine (CI)
(в Helium (He)
(c Nitrogen (N)
(D) Zinc (Zn)
Based on its location on the periodic table, the element that would predictably have chemical properties most similar to argon (Ar) is Helium (He).
Elements found to the right of the zig-zag line are classified as
(A) Metals
(B Transition Metals
(c) Metalloids
B) Nonetals
(c) Metalloids
Is this right?
My apologies for the incorrect response. The correct answer is (B) Nonmetals. Elements found to the right of the zig-zag line on the periodic table are typically classified as nonmetals.
A class observes two demonstrations: water changing into steam and a piece of wood burning and producing smoke. A student concludes that both demonstrations must be examples of a chemical change because a gas is produced in each.
Is the student's conclusion accurate? Explain your answer, referring to both demonstrations.
The student's conclusion is accurate. Both demonstrations are examples of a chemical change because they involve a chemical reaction that results in the formation of a gas.
In the first demonstration, the water changing into steam involves the process of evaporation. This is a phase change, but it is also a chemical change because the water molecules are breaking apart and forming water vapor molecules. As a result, a gas (water vapor) is produced.
In the second demonstration, the wood burning and producing smoke is a combustion reaction. This is a chemical change because the wood molecules are reacting with oxygen in the air to produce carbon dioxide, water vapor, and other combustion products. The smoke that is observed is a mixture of particles and gases produced during the burning process, including carbon dioxide and other gases.
In both cases, a gas is produced as a result of a chemical reaction, indicating that a chemical change has occurred. Therefore, the student's conclusion is accurate.
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electron
neutron
proton
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