Sig Figs
This is the number of significant figures in 0.00263.
What is 3?
J.J. Thomson discovered this using cathode ray tubes
What is the electron?
The nucleus contains these two subatomic particles.
What is protons and neutrons?
John Dalton proposed the Atomic Theory in 1808. His four statements are as follows:
1. All matter is composed of extremely small particles called atoms
2. Atoms of an element are identical in size, mass, and other properties
3. Atoms cannot be subdivided, created, or destroyed
4. Atoms of different elements combine in whole number ratios
3 out of the 4 statements still hold true to this day. However, this statement has been proven incorrect.What is atoms of an element are identical in size, mass, and other properties?
This number is the number of atoms in 3.25 moles of Ca.
What is 1.96 x 1024 atoms of Ca?
This is the number of significant figures in 1.00982.
What is 6?
This law states that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or the source of the compound.
What is the Law of Definite Proportions?
The atomic number provides this information about elements on the periodic table.
What is the number of protons?
This SI base unit is the unit for the amount of substance.
What is the mole?
This number is the number of moles in 41.73 grams of Rn.
What is 0.1880 moles of Rn?
This is the sum of 230 and 386.27, calculated with the correct number of significant figures.
What is 620?
The proton and the size of the nucleus were discovered by Ernest Rutherford using this experiment.
What is the gold foil experiment?
What is neutrons?
What is the proton?
Bromine has two isotopes:
Bromine-79 with an abundance of 50.69%
Bromine-81 with an abundance of 49.31%
Taking a weighted average of the isotopes results in this number for the average atomic mass of bromine.What is 80. amu?
This is the product of 498 and 50, calculated with the correct number of significant figures.
What is 20000?
This law states that mass is neither created nor destroyed during ordinary chemical and physical changes.
What is the Law of Conservation of Mass?
The mass number of an element is the sum of these two subatomic particles.
What is protons and neutrons?
These create a strong, stable nucleus in an atom.
What are nuclear forces?
This number is the number of atoms in 28.3 grams of Fe.
What is 3.05 x 1023 atoms of Fe?
This is the answer of the following calculation:
(12.5 + 4.31) / 1.1
What is 15?
This law states that compounds must be composed of whole number ratios of elements.
What is the Law of Multiple Proportions?
This isotope of hydrogen is the most common form of hydrogen.
What is protium?
What is Avogadro's Number (6.022 x 1023)?
This number is the number of grams in 9.348 x 1025 atoms of Ag.