Between these two types of particles (protons and electrons), these contribute more to an atom's size.
What are electrons?
100
A material consisting of only one type of atom.
What is an element?
100
According to the following balanced equation CH4 + 2 O2 → CO2 + 2 H2O , this is the number of moles of H2O produced if you combust 1 mole of CH4.
What is two 2 moles?
100
Among the following solutions, (1 g sugar in 1 L H2O ; 5 g sugar in 5 L H2O ; and 2 g sugar in 1 L H2O), this is the most concentrated solution.
What is 2 g sugar in 1L H2O?
100
A form of matter that cannot be broken down by chemical change.
What is an Element?
200
This group of elements outermost shells contain 8 electrons.
What are Noble Gases?
200
The compound C6H12O6 has that many elements.
What is 3?
200
According to this balanced chemical equation, 2 H2 + O2 → 2 H2O , this is the number of moles of O2 you would need to generate 1 mole of water.
What is ½ ?
200
This is the mass of two moles of H2 (g).
What is 4 g?
200
This is doubled when the temperature of an ideal gas is doubled under constant volume.
What is Pressure?
300
A neutral element with 7 protons has this many number of electrons.
What is 7?
300
When comparing air, salt and calcium carbonate CaCO3, only this is a mixture.
What is air?
300
To balance this chemical reaction (3 NO → __ N2O + NO2), this is the number of moles of N2O needed.
What is 1 mole?
300
These two physical quantities change most when a junked car is neatly crushed into a compact cube.
What is volume and density?
300
This halogen has the greatest tendency to gain electrons of all elements.
What is Fluorine?
400
An atom emits this when an electron moves from a higher energy level to a lower energy level.
What is electromagnetic radiation?
400
The number of hydrogen atoms in ammonium sulfate (NH4)2SO4 is this.
What is 8?
400
To balance this chemical reaction ( __ P4 + __ H2 → __ PH3), these are the number of moles required.
What is 1, 6 and 4?
P4 + 6 H2 → 4 PH3
400
Among these four samples of equal mass but different densities, (1.5 g/mL ; 2.5 g/mL ; 2.0 g/mL ; 0.50 g/mL), this sample has the largest volume.
What is 0.5 g/ml ?
400
The density of a given mass of water will do this when it starts to expand.
What is decrease?
500
The electron in the hydrogen atom can be boosted to many different energy levels. Upon returning to the ground state, they create these.
What are spectral lines?
500
These are the names of these compounds, NaF and KBr.
What is Sodium Fluoride and Potassium Bromide?
500
According to this chemical reaction, 2 N2 + 6 H2 → 4 NH3, this is the total number of bonds formed in 4 molecules of ammonia when nitrogen and hydrogen react.
What is 12?
500
This is the density of a 15 g block of wood which, after immersed in water, displaces 10 ml of water.
What is 1.5 g/ml?
500
The high specific heat capacity of water is due to these.