The valence-shell electron-pair repulsion (VSEPR) theory states that electron pairs repel each other whether or not they are in bond pairs or in lone pairs. ... The shape of a molecule is determined by the location of the nuclei and its electrons
Nonrenewable resources include crude oil, natural gas, coal, and uranium.
114.3%
Explanation:
Given parameters:
True amount of solid = 1.4g
Measured amount = 3.0g
Unknown:
Percentage error = ?
Solution:
The inaccuracy in the reading is termed uncertainty.
This is the error.
Error = true value - measured value.
The values of errors are absolute.
Percentage error = 
Percentage error = 
x 100 = 114.3%
This is large amount of error
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1. At constant tempaerature and pressure, 3 tablets produce 600cm^3 of gas
Thus calculating for 1 tablet that produces 600 / 3 = 200 cm^3
So now two tablets produce 200 x 2 = 400 cm^3
2. We have the equation PV = nRT, n being the number of moles
Pressure P = 1,000 kPa
Volume V = 3 L
R = 8.31 L kPa/mol-K
Temperature T = 298 K
n = PV / RT = (1000 x 3) / (8.31 x 298) = 3000 / 2476.38 = 1.21 moles
Number of moles = 1.21 moles.
You need to look at the Periodic table. The atomic number is the number of protons. When you subtract the atomic number from the mass number, you get the number of neutrons. i.e. for Beryllium (Be) the atomic number is 4, so it has 3 protons. Its atomic mass about 9, so 9-4=5. Therefore, there are 5 neutrons.
