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ozzi
4 years ago
12

How many moles are in a 4.2 gram gold sample

Chemistry
1 answer:
lubasha [3.4K]4 years ago
7 0
The answer is 196.96655 hope this helps
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Balance the following equation in acidic conditions. Phases are optional.
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I think the reaction involved here is a redox reaction in acidic conditions. To balance this type of reaction, we do as follows:

Balance the O atoms in each side by adding H2O on either side.
Balance H atoms in each side by adding H+.
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What is the molar mass of magnesium
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3 years ago
Why did Mendeleev put bromine (Br) and chlorine (Cl) in the same group on the periodic table?
Kaylis [27]
They have similar properties.Bromine and Chlorine both have equal chemical properties. They both have 7.electrons in the outermost energy level. They both gain 1 electron to get the. noble gas configuration.Cl and Br have same chemical properties. They have 7,valence electrons. They both are non-metals. Bromine and chlorine are in group VII A, which could also be designated Group 7a, of the narrow form periodic table that was commonly used before 1980. Most chemists now prefer a wide form periodic table, in which these elements are in column 17. The periodic table has been set up to illustrate the repeating nature of the elements as we progress along their atomic number. Cl (chlorine) and Br (bromine) are very similar because they both have seven valence electrons, and both need only one more to be like a noble gas. (The need to have eightelectrons in the outer main shell is called the octet rule, and the reason for <span>this is understood by scientists, but is complicated.) HOPE IT HELPED
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6 0
3 years ago
What is the wavelength of one ultraviolet photon if it’s frequency is 1.50 x 10^15 s^-1
Alik [6]
C=λν ==> λ=c/ν

λ= 3x10^8 m/s / 1.50 x 10^15 s^-1
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λ= 200 nm
5 0
3 years ago
Can somebody please help me!!!
Paraphin [41]

Answer:

speed

Explanation:

Speed is the rate at which something moves. The speed of light is faster than the speed of sound.

4 0
3 years ago
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