Lab techniques
This technique is used to separate particles by size.
Filtration
Pressure and volume are ___ related
inversely
The thermal energy change of a system under constant pressure is called
Enthalpy
What is the chemical symbol for lead?
Pb
You're James Bond, trapped in a room! Suddenly, nozzles open up and a purple gas is ejected into the room. Based on your knowledge of chemistry, you know that this gas is...
poisonous!
This technique is used to separate liquids by boiling point
distillation
If I double the celsius temperature of a sample of gas in a balloon, the volume of the gas will (more than double/double/less than double).
You mix a solid with some water in a test tube. During the reaction, the tube feels warm to the touch. Is this process endo- or exothermic?
exothermic
What group on the periodic table contains elements that form -3 ions?
Group 15
A compound with the empirical formula NH2 has a molar mass of 32 g/mol. What is its molecular formula?
N2H4
To find the pressure of a sample of gas collected over water, you need to know what two things?
The atmospheric pressure and the vapor pressure of water at the lab's temperature.
He and Ar gas each occupy an identical container. Their temperatures and the number of particle in each container are the same. Which of the following values is NOT the same for these two samples?: average KE, phase energy, density, volume
Ice cubes at zero degrees celsius start to melt. What type(s) of energy in the ice cube system are changing and how?
Hydrogen is considered part of what two groups of elements?
Group 1 and Group 17
Name Ni3(PO3)2
Nickel (II) phosphite
What ion(s) will be lost if you decant the liquid after the following reaction? Include charges!
BaCl2 (aq) + 2 NaOH (aq) --> 2 NaCl (aq) + Ba(OH)2 (s)
Na+ and Cl-
What is the value of R to four significant figures in units of L*atm/(mol*K)?
0.08206 L*atm/(mol*K)
Two substances, A and B, of equal mass but at different temperatures come into thermal contact. The specific heat capacity of substance A is twice the specific heat capacity of substance B. What two things will be true of the final temperature?
It will be between the initial temperatures of A and B; it will be closer to substance A's initial temperature.
Many element symbols come from their names in latin, but others have their origin in other languages. Tungsten's symbol, W, stands for Wolfram. What is wolfram's language of origin?
German
What is the name of the guy in greek mythology who was condemned to push a rock up a hill eternally?
Sisyphus
How does vacuum filtration work?
The rushing water lowers the pressure in the tube and sidearm flask, causing atmospheric pressure to push the liquid through the filter.
A real gas differs from an ideal gas in two important ways. What are they?
Gas molecules have a volume, gas molecules do exert some attractive forces on each other.
Consider the reactions:
A -> 2 B ΔH1
A -> 3 C ΔH2
What is the enthalpy change for the reaction
4 B -> 6 C
2ΔH2 - 2ΔH1
What element is named after the man who invented the (almost) modern periodic table, organizing elements by mass?
Mendelevium, Md, 101
What country recently banned teens under 16 from social media accounts?
Australia