Pure Substances vs Mixtures
This type of matter always has the same composition and properties no matter where it is found.
What is a pure substance?
What is salt?
This is the positively charged center of an atom.
This particle has a negative charge.
What is an electron?
Carbon-12 and carbon-14 are examples of this.
What are isotopes?
What is a homogeneous mixture?
This method separates substances based on their size by passing the mixture through a porous barrier.
What is filtration?
The number of protons in the nucleus determines this number of an element.
What is the atomic number?
The number of electrons in a neutral atom equals the number of these particles.
What are protons?
You multiply the percent abundance with this to get the average atomic mass.
What is the isotope mass?
Mixing salt and pepper creates this kind of mixture.
What is a heterogeneous mixture?
A mixture of liquids with different boiling points can be separated using this technique.
What is distillation?
These two subatomic particles make up almost all of the mass of an atom.
What are protons and neutrons?
This particle is much lighter than a proton.
What is an electron?
The number listed on the periodic table that is not a whole number.
What is the average atomic mass of the element?
Brass is made by physically bonding copper and zinc. This substance is an example of what?
What is an alloy (homogeneous mixture)?
This is the easiest way to pull out iron from sand.
What is empty space?
An atom has a mass number of 40 and contains 18 protons. This is the number of neutrons and electrons this neutral atom has.
What are 22 and 18?
Chlorine has two naturally occurring isotopes with masses 35 u (75%) and 37 u (25%). This is its atomic mass.
What is 35.5 u?
A solution's ability to remain uniform at the molecular level distinguishes it from this type of mixture, where components are visible.
What is a heterogeneous mixture?
What is crystallization?
An atom has 15 protons, 16 neutrons, and 15 electrons. This is its mass number and atomic number.
What are 31 and 15?
A neutral atom has 19 protons and 20 neutrons. If it loses 2 electrons, this is its charge and chemical symbol.
What is 2+ and K2+?
An element with two isotopes has a mass of 50u (40%) and 52u (60%). This is its atomic mass.
What is 51.2u?