How many ions are present in 0.20 mol of \( (NH_{4})_{2}SO_{4} \)?
Question Topics: Structure 1. Models of the particulate nature of matter
Q-DC358 (Set 5)
A fixed volume of an ideal gas, initially at \( 30^{\circ}C \) and with a pressure of P Pa, was
Q-DC358
What is the name of this change of state? \( CO_{2}(g)\rightarrow CO_{2}(s) \)
Q-DC358 (Set 2)
What is the best evidence that energy levels are closer together as distance from the nucleus increases?
N25-CHEM-HL-TZ1-P1A-Q5 [Q-BE2E6]
In which of the following sets of conditions does the gas exhibit behaviour closest to an ideal gas?
N25-CHEM-HL-TZ1-P1A-Q4 [Q-34E50]
$5.72~g$ of $Na_{2}CO_{3} \cdot 10H_{2}O$ ($M_{r}=286~g\cdot mol^{-1}$) is dissolved in water to prepare $0.4~dm^{3}$ of aqueous solution. What is the
N25-CHEM-HL-TZ1-P1A-Q3 [Q-6F58A]
Which orbital diagram represents a correct ground state electron configuration based on the Pauli exclusion principle and Hund’s rule?
N25-CHEM-HL-TZ1-P1A-Q2 [Q-15DE5]
Chlorine is a diatomic molecule that contains $75\%$ of ${}^{35}Cl$ and $25\%$ of ${}^{37}Cl$. Which graph shows the full mass
N25-CHEM-HL-TZ1-P1A-Q1 [Q-E078B]
Which methods for separating the given mixtures into their components are correct? I. A mixture of solid in a liquid