Some Basic Concepts of Chemistry
What is the SI unit of the amount of substance?
How many significant figures are present in $0.0025$?
Which of the following concentration terms is independent of temperature?
Who proposed the Law of Conservation of Mass?
What is the empirical formula of glucose ($C_6H_{12}O_6$)?
What is the molarity of a solution containing $4\text{ g}$ of $\text{NaOH}$ dissolved in $250\text{ mL}$ of solution?
The total number of atoms present in 1 mole of oxygen gas ($O_2$) is:
Who formulated the Law of Multiple Proportions?
Convert $27^\circ\text{C}$ to the Kelvin scale of temperature.
What is the mass percentage of oxygen in water ($H_2O$)? (Given atomic masses: H = 1 u, O = 16 u)
The reactant that is completely consumed in a reaction and limits the amount of product formed is called the:
How many significant figures are present in the number 500.0?
What is the mass of 1 mole of carbon dioxide ($CO_2$) gas?
The Law of Definite Proportions was proposed by:
According to Gay Lussac's Law of Gaseous Volumes, when gases combine in a chemical reaction, they do so in a simple ratio by:
How many moles are present in $90\text{ g}$ of pure water ($H_2O$)?
What is the accepted numerical value of Avogadro's constant ($N_A$)?
Which state of matter has a definite volume but no definite shape?
Dalton's atomic theory could NOT explain which of the following laws?
If $30\text{ g}$ of $H_2$ reacts with $30\text{ g}$ of $O_2$ to form water ($2H_2 + O_2 \rightarrow 2H_2O$), which reactant is the limiting reagent?