Based on reactivity, which of the following elements can replace aluminum (Al) in a compound during a single replacement reaction?
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Light of three different wavelengths—325 nm, 455 nm, and 632 nm—is shined on a metal surface. The observations for each wavelength, labeled A, B, and C, is as follows: Observation A: No photoelectrons were observed. Observation B: Photoelectrons with a kinetic energy of 155 kJ/mol were observed Observation C: Photoelectrons with a kinetic energy of 51 kJ/mol were observedWhich observation corresponds to which wavelength of light?
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Answer:
0.88g
Explanation:
The reaction equation:
2NaI + Cl₂ → 2NaCl + I₂
Given parameters:
Mass of Sodium iodide = 2.29g
Unknown:
Mass of NaCl = ?
Solution:
To solve this problem, we work from the known to the unknown.
First find the number of NaI from the mass given;
Number of moles =
Molar mass of NaI = 23 + 126.9 = 149.9g/mol
Now insert the parameters and solve;
Number of moles = = 0.015mol
So;
From the balanced reaction equation;
2 moles of NaI produced 2 moles of NaCl
0.015mole of NaI will produce 0.015mole of NaCl
Therefore;
Mass = number of moles x molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Now;
Mass of NaCl = 0.015 x 58.5 = 0.88g
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They utilize and make use of the scientific method in order to have clear basis and evidence for their investigations. Research method is always used to answer every scientific inquiry and in gaining evidential data or knowledge. The scientific method has the following process or at least undergoes the process of
1. Observation
2. Hypothesis
3. Experimentation
4. Interpretation of data
5. Evaluating the data
6. Passing and recording the data
These steps are crucial and the empirical data that these scientists obtain are very important to keep that is why research paper, thesis and dissertations exists.
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Answer:
C. Electrons
Explanation:
covalent compound
element
atom
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Final answer:
When a nonmetal bonds with another nonmetal, they typically form a covalent compound. This is because nonmetals have similar tendencies to attract electrons and, hence, they form a mutual sharing of electrons which constitutes a covalent bond.
Explanation:
When a nonmetal bonds with another nonmetal, they form a covalent compound. Covalent compounds are formed when two atoms share electrons, rather than transferring them as in ionic bonding. Nonmetals typically have similar electronegativities, meaning they both have similar tendencies to attract electrons. As a result, neither atom completely transfers its electron(s) to the other, they rather settle on a compromise and decide to share the electron(s). This sharing of electrons is the basis of a covalent bond. An example is the covalent bond of two oxygen atoms to form an O2 molecule.
Learn more about Covalent Bond here:
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hope this helps*winks*
the frequency in Hertz
the Energy in Joules