Atomic Structure
To maintain its status as electrically neutral, an atom must ensure that its counts of these two oppositely charged subatomic particles are perfectly balanced.
What are protons and electrons?
Often found in the laboratory and the human stomach, this common acid is represented by the formula HCl.
What is hydrochloric acid?
This reaction type is the ultimate "breakup," where a single reactant, such as 2H₂O, splits apart into two or more simpler products.
What is a decomposition reaction?
This specific constant, 6.022 x 10²³, represents the staggering number of individual atoms found in exactly one mole of any pure substance.
What is Avogadro's number?
This exothermic process occurs when a substance releases heat energy at a constant temperature, transitioning from a gas to a liquid.
What is condensation?
These specific s- and p- electrons are the "VIPs" of the atom, residing in the highest energy level and determining how an element will bond.
What are valence electrons?
When a calcium ion (Ca²⁺) meets two chloride ions (Cl⁻), they combine to form this neutrally charged ionic compound.
What is Calcium Chloride (CaCl₂)?
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
This is an example of this type chemical reaction.
What is single replacement?
If you are holding a 30.15-gram sample of pure silver (Ag), you are actually holding this specific number of moles of silver atoms.
What is 0.2795 mol?
If you dissolve 58 grams of NaCl (approx. 1 mole) into 2.0 liters of water, you have created a solution with this specific molarity.
What is 0.50 M?
If you are analyzing a chlorine isotope that packs 17 protons and 18 neutrons into its nucleus, you would identify it by this specific mass number.
What is 35?
This is the proper name for the N₂O₃ molecule.
What is dinitrogen trioxide?
To satisfy the conservation of mass, these four coefficients are required to balance the equation: __Fe₂O₃ + __CO → __Fe + __CO₂.
What are 1, 3, 2, 3?
At Standard Temperature and Pressure (STP), a 50.2-gram sample of CO₂ gas will expand to occupy this total volume in liters.
What is 25.6 L?
Falling at a level 5 on the pH scale, this popular morning beverage is considered "slightly acidic."
What is black coffee?
For an electron to take the "quantum leap" from its stable ground state to a higher energy excited state, this specific event must occur.
What is the absorption of energy?
This is the correct chemical notation for aluminum sulfate, a compound requiring two aluminum ions and three sulfate polyatomic ions.
What is Al₂(SO₄)₃?
In the balanced synthesis reaction 2KCl + 3O₂ → 2KClO₃, this is the fixed molar ratio of oxygen to the final product, potassium chlorate.
What is 3:2?
Under Boyle's Law, if you take a 3.0 L gas sample at 3.0 atm and increase the pressure to 5.0 atm, the volume will shrink to this final value.
What is 1.8 L?
To prepare 500. mL of a 3.00 M solution of sodium chloride, a lab technician must weigh out this exact mass of NaCl.
What is 87.7 grams?
A mysterious element reveals its identity through this specific electron configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰.
What is Zinc?
To correctly name the compound Fe(NO₃)₂, you must identify that the iron atom is carrying this specific oxidation state.
What is iron (II) nitrate?
Using the reaction 4NH₃ + 5O₂ → 4NO + 6H₂O, you can predict that reacting 34.00 grams of ammonia with excess oxygen will produce this mass of water.
What is 53.93 grams?
To produce 2.0 L of nitrogen gas at STP via the reaction 2NaN₃ → 2Na + 3N₂, you must begin with this mass of sodium azide.
What is 3.9 grams?
What type of matter is formed when two or more elements are chemically combined?
What is a pure substance?