Matter
A property of a substance that can be observed without changing the substance’s identity. Give an example.
What is a physical property? Color, texture, smell, taste, density, freezing point, melting point, solubility, miscibility...
A characteristic that can be observed by changing the identity of the substance in a chemical reaction. Give an example.
What is a chemical property? Reactivity to acids, combustion, pH...
Name the two things you must observe to identify an element or a compound.
What are physical and chemical properties?
Name the 3 particles that determine the properties of an atom and their charges.
What are protons (+), neutrons (0), and electrons (-)?
The ability of a liquid to mix with another liquid.
What is miscibility?
A property of matter that defines how much matter exists in a particular space.
What is density?
Describe the difference between a molecule and a compound.
What is molecules are made up of two or more atoms, while compounds are made up of two or more different atoms?
Can you tell the difference between an element and a compound by measuring mass and volume? Explain.
No, because properties such as color, texture, visual appearance, mass, and volume are similar for many elements and compounds.
The atomic number, written above an element's symbol on the Period Table, represents this.
What is the number of protons and electrons in the element's atom?
Name the subatomic particle that determines the identity of an atom.
What is the proton?
Do compounds composed of the same elements have identical properties? Explain.
No! Ex. Vitamin C, sugar, vegetable oil
What are the elements in the compound NaHCO3? How many of each element are in the compound?
Na H C O, 1 1 1 3
The atomic mass of an atom describes the mass of these two subatomic particles.
What are protons and neutrons?
What are the two things that determine the properties of a compound?
The type of atom and the amount of atoms in a compound.
The element Selenium (Se) has an atomic number of 34 and an atomic mass of 79. How many neutrons does one atom of Selenium possess?
What is 79 - 34 = 45?
Can compounds composed of different elements have similar properties? Explain.
Yes, sometimes! Ex. salt vs. sugar vs. calcium carbonate