Pure Substances vs Mixtures
Water, because it is made of identical molecules throughout, is classified as this.
What is a pure substance (compound)?
This separation method uses a funnel and paper to remove solid impurities from a liquid.
What is filtration?
The nucleus contains these two types of particles.
What are protons and neutrons?
This subatomic particle has no charge.
What is a neutron?
Atoms of the same element with different numbers of neutrons are called this.
What are isotopes?
Soil is an example of this type of mixture because its components are not evenly distributed.
What is a heterogeneous mixture?
A solution like salt water can be separated by heating it until the water leaves as vapor.
What is evaporation?
This subatomic particle determines the identity of an element.
What is the proton?
A neutral atom of nitrogen has 7 protons. This is how many electrons it has.
What is 7?
If an element has isotopes of 10 u (50%) and 12 u (50%), its average atomic mass is this.
What is 11 u?
A mixture that has uniform composition throughout is described as this.
What is homogenous?
This technique separates colored dyes because each pigment travels a different distance in a solvent.
What is chromatography?
An atom with 19 protons and 20 neutrons has this mass number.
What is 39?
An atom with 11 protons and 10 electrons has this net charge.
What is +1?
To calculate average atomic mass, multiply each isotope's mass by this value before adding.
What is percent abundance?
Two or more substances physically combined, not chemically combined, form this.
What is a mixture?
This method uses differences in boiling points to separate a liquid from another liquid with a higher boiling point.
What is distillation?
A neutral atom has the same number of these two particles.
What are protons and electrons?
A 2- ion with 16 protons must have this many electrons.
What is 18 electrons?
An element has isotopes of 30 u (70%) and 32 u (30%). The average atomic mass is this.
What is 30.6 u?
Bronze, a mixture of copper and tin, is classified as this.
What is an alloy (homogeneous mixture)?
The best technique for recovering a solid from a solution when you want it to form slowly and more purely.
What is crystallization?
An atom has an atomic number of 34 and a mass number of 79. A 2- ion of this atom contains this many neutrons.
What is 45 neutrons?
What is sodium?
An element has isotopes of 20 u (25%), 22 u (50%), and 25 u (25%). Its average atomic mass is this.
What is 22.25 u?