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Chemistry

Barrett Kunze

Lvl 9
2021-09-30 20:41:44
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Cards in this guide (20)
What was the US's Domestic Policy during the 1950's

The domestic policy of the United States in the 1950s was one of massive production. It was assumed that the nation was under threat from the Soviet Union, so production of weapons was a priority. It was actually very good for the economy.

Which of the following elements has the highest electronegativity

Al, Ca, H, or K?

How did Albert Einstein explain the photoelectric effect

Apex

What does the electronegativity of an atom indicate

the tendency of the atom to pull on electrons Apex : )

Who believed that government only exists if the people allow it

Enlightenment thinkers

Which of the following would be useful for converting gmol to gL

molarity

What is the mass of CO2 in atomic mass units

44 amu

How does one determine an empirical formula from a percent composition

Divide the percent composition of each element found by the gram atomic mass of that particular element. The resulting quotients will have small whole number ratios to each other or one another. Write the chemical symbols for the elements found by analysis in order of increasing electronegativity, each with a subscript corresponding to its small whole number in the ratios found. If possible, divide the subscripts so obtained by a whole number other than 1 that results in an integral quotient from each subscript. When such division is no longer possible, the resulting formula is the empirical formula of the compound analyzed.

What kind of bond is made up of shared electrons

covalent bond

What happens to the atomic radius when an electron is gained

What country was attacked at the beginning of the Persian Gulf War

Kuwait, which was invaded by Iraq.
Kuwait

How does one determine a molecular formula from the empirical formula

molar mass over grams of element

The above answer is somewhat correct. In order to find the molecular formula when given the empirical formula, you must first find the molar mass of the empirical formula.

MOLAR MASS

# atoms element A x atomic mass element A (periodic table) = mass A

# atoms element B x atomic mass element B (periodic table) = mass B

... etc.

Add up all of the mass values found above and you have the molar mass.

Then, after you have found the empirical formula's molar mass, you divide the molar mass of the molecular formula by the empirical formula's molar mass (solving for n).

MOLECULAR FORMULA EQUATION: N (Empirical formula) (read as N times empirical formula) where:

N = Molar mass substance

---- Molar Mass emp. form.

Why is an element's atomic mass not listed as a whole number on the periodic table
1. It represents the weighted average mass of all natural isotopes of that element.
2. Individual isotopes do not have whole number atomic masses as some of the mass of the protons and neutrons has been converted to the "binding energy" holding the nucleus together against its repulsive positive charge of the protons (E=Mc**2).

Google's instant messaging software is called Google Talk, but the program has since been discontinued. Communication is now done through Google+ Hangouts, which is being merged with the old Google Talk. Hangouts is freely available directly from Google's website.

Which was not an issue during the 2004 US presidential election

Defending Iraq from Kuwait

Which of the following ideas is a major element of trickle down economics

Cutting taxes on businesses will encourage them to hire more workers. (Apex)

Which of the following elements is the smallest

question: which of the following elements is the smallest?

This family is called, after IUPAC nomenclature -- actinoids.

How many orbitals are in second energy level

There are eight orbitals in the second energy level.

Which was a result of hurricane Katrina

Americans criticized President Bush.

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