General Chemistry
What is the smallest unit of an element that retains its chemical properties?
An atom
What type of inorganic compound is NaOH?
A base
What laboratory equipment is commonly used to measure liquid volume more accurately than a beaker?
Graduated cylinder
Calculate the equivalent mass of Ca(OH)₂ in an acid-base reaction.
74/2=37 g/eq
What term describes how fast a chemical reaction occurs?
Reaction rate
What are the main steps to prepare a solution of a specific concentration from a solid substance?
Weigh the required amount of solute, dissolve it in a small amount of distilled water, transfer it to a volumetric flask, and add distilled water to the mark.
What is the chemical name of H₂SO₄?
Sulfuric acid
What piece of equipment is used to measure mass in the laboratory?
A balance
Calculate the equivalent mass of H₂SO₄ in an acid-base reaction.
98/2=44 g/eq
What generally happens to the reaction rate when temperature increases?
The reaction rate increases
What type of chemical bond is formed by the transfer of electrons from one atom to another?
Ionic bond
Complete and balance the reaction: HCl + NaOH → ?
HCl + NaOH → NaCl + H₂O
What equipment is used to transfer a small, accurately measured volume of liquid?
A pipette
Calculate the mass fraction (%) of oxygen in H₂O.
88.9% O
What substance increases the rate of a reaction without being consumed overall?
A catalyst
How many moles are present in 36 g of H₂O?
2 mol
Identify the products and balance the reaction between calcium carbonate and hydrochloric acid.
CaCO3 + 2HCl = CaCl2 + H2O + CO2
When preparing a diluted acid solution, should you add acid to water or water to acid?
Add acid to water
Calculate the mass fraction (%) of calcium in CaCO₃.
40% Ca
Why does increasing the concentration of reactants usually increase the reaction rate?
Because reactant particles collide more frequently.
How many molecules are present in 0.5 mol of CO₂?
Use 6.022 × 1023
3.011 × 10²³ molecules
You are given three unlabeled solutions: HCl, NaOH, and NaCl. You have only blue and red litmus paper. How can you identify all three solutions?
A student needs to heat a test tube. In which direction should the opening of the test tube point?
Away from yourself and other people.
A compound contains 40% Ca, 12% C, and 48% O by mass. Determine its empirical formula.
CaCO₃
A reaction has the rate law: Rate=k[A]^2[B]
Third order, 2+1=3