Science Test Notes Flashcards
What is the atomic number equal to
The number of protons
What charge do protons have
Positive
An atoms is ___
The smallest unit of matter that has the properties of an element and is made up of protons, neutrons, and electrons
Which of the following characteristics is a property of metals
Malleable
Insulator
Brittle
Dull
Malleable
What’s the definition of a compound?
A substance made of at least two elements that are chemically combined
Which of the following is considered a mixture
Zinc (Zn)
Carbon monoxide (CO)
Water (H2O)
Salt Water (H20 and NaCI)
Salt water
What’s a mixture
Two or more substances found in the same area but not chemically bonded
What are chemical formulas
Symbols that show the elements in the compound and their ratio
What does subscript 3 mean in ZnCO3
There are 3 oxegyn atoms
What is the ratio of Calcium atoms to Oxegyn atoms in the compound CaCO3
1:3
Two formulas for compounds containing hydrogen and oxegyn are CO and CO2 do these formulas represent the same compound?
No, because each compound has a different ratio of atoms in its chemical formula
What’s the chemical formula for
Sulfuric Acid: 2 hydrogen,1 sulfur, 4 oxegyn
H2SO4
What’s the chemical formula for
Citric Acod: 6 carbon, 8 hydrogen, 7 oxegyn
C6H8O7
What is the most common element in Earths atmosphere
Nitrogen
Which is one reason that certain elements such as hydrogen, oxygen, and carbon might be more common on Earth and in living things than most other elements
They form compounds easily
