Insignificant Figures
The number of significant figures in the number 1.2920 x 10-14
What is 5?
This term describes the flammability of butane or the ability of iron to rust.
What is a chemical property?
This part of Dalton's original atomic theory was later proven false by the discovery of protons and neutrons.
What is the idea that atoms are indivisible?
Of the three subatomic particles, this one has negligible mass and a negative charge.
What is the electron?
This quantity is defined as the number of atoms in exactly 12.000 grams of carbon-12.
What is Avogadro's number?
This is the mass percent of sodium in sodium bromide (NaBr).
What is 22.3%?
This is the formula used to calculate the molarity of a diluted solution from a stock solution.
What is M₁V₁ = M₂V₂?
This is the formula for calculating density.
What is mass divided by volume?
When adding 26.7 g + 3.842 g + 137 g, this is the result reported to the correct number of significant figures.
What is 168 g?
Melting ice, boiling water, and dissolving sugar in water are all examples of this type of change.
What is a physical change?
J.J. Thomson's cathode ray experiment led to the discovery of this subatomic particle.
What is the electron?
These subatomic particles are found in the nucleus.
What are protons and neutrons?
This is the mass in grams of 3.50 moles of aluminum.
What is 94.5 g?
This is the mass percent of sulfur in magnesium sulfate (MgSO₄).
What is 26.6%?
This is the molarity of a solution prepared by dissolving 95.2 g of magnesium chloride in 452 mL of water.
What is 2.21 M?
A gold bar has a density of 19.3 g/cm³ and a mass of 82.18 g. This is its volume in cm³.
What is 4.26 cm³?
0.000763 expressed correctly in scientific notation.
What is 7.63 × 10⁻⁴?
Salt water, air, and vinegar are all examples of this type of mixture, where the composition is uniform throughout.
What is a homogenous mixture?
This scientist's gold foil experiment led to the discovery of the nucleus.
Who is Ernest Rutherford?
Cu²⁺ has this many electrons.
What is 27?
This is the number of moles present in a 0.2385 kg sample of magnesium chloride.
What is 2.507 mol?
This is the mass of magnesium in a 0.2385 kg sample of magnesium chloride.
What is 60.9 g?
This is the molarity of a solution prepared by diluting 5.00 mL of 3.385 M HCl to a final volume of 100.0 mL
What is 0.169 M?
A liquid has a mass of 35.4 g and a volume of 28.7 mL. This is its density.
What is 1.23 g/mL?
12.5849 mg + 2.6 mg reported to the correct number of significant figures.
What is 15.2 mg?
This law explains why the mass of products in a chemical reaction must equal the mass of the reactants.
What is the Law of Conservation of Mass?
This law, which supports Dalton's atomic theory, states that a given compound always contains the same proportions of elements by mass.
What is the Law of Constant Composition (or Law of Definite Proportions)?
⁶³Cu and ⁶⁵Cu are both isotopes of copper. These are the number of neutrons found in each.
What are 34 and 36?
This is the number of atoms present in a 95.2 g sample of magnesium chloride.
What is 1.81 × 10²⁴ atoms?
Given an empirical formula of C₂H₃O₂ and a molar mass of 118.088 g/mol, this is the molecular formula of succinic acid.
What is C₄H₆O₄?
A stock solution of K₂Cr₂O₇ is prepared by dissolving 0.892 g in 500.0 mL of solution. This is the molarity of the stock solution.
What is 6.06 × 10⁻³ M?
A rectangular block of aluminum has dimensions 2.50 cm × 3.75 cm × 1.85 cm and a density of 2.70 g/cm³. This is its mass in grams.
What is 46.9 g?
550 nanograms expressed in kilograms in scientific notation
What is 5.50 × 10⁻¹⁰ kg?
When a gas camping stove is lit and 22 g of propane reacts with 16 g of oxygen, this is the total mass of products formed.
What is 38 g?
Dalton's atomic theory stated that atoms of one element cannot be converted into atoms of another element. This modern process contradicts that claim.
What is radioactive decay? (Or nuclear reaction)
This alkaline earth metal ion is isoelectronic with F-, meaning they have the same number of electrons.
What is Mg2+?
This is the number of atoms present in a 2.25 carat diamond, given that 1 carat = 200 mg.
What is 2.26 × 10²² atoms?
A compound is found to be 40.68% carbon, 5.12% hydrogen, and 54.20% oxygen by mass. This is its empirical formula.
What is C₂H₃O₂?
10.00 mL of the K₂Cr₂O₇ stock solution is diluted to 250.0 mL, and then 5.00 mL of that solution is diluted to 100.0 mL. This is the final molarity.
What is 1.21 × 10⁻⁵ M?
The density of aluminum is 2.70 g/cm³. This is its density expressed in kg/m³.
What is 2700 kg/m³?