unit one test Flashcards
How many periods are on the periodic table? How many groups?
7 periods &18 groups on the periodic table.
How many neutrons are in an atom of carbon-14?
8 neutrons
What is the mass of one NaCl unit if a chlorine atom has a mass of 35.5 atomic mass units and a sodium atom has a mass of 23.0 atomic mass units?
58.5 atomic mass units
What is the atomic number of Gold (Au)?
79
What is the atomic number of Sodium (Na)?
11
How many electron dots would any element in group 2 of the periodic table have?
2 electron dots
Give 2 examples of chemical properties.
Flammability, reactivity
Give 3 examples of physical changes.
Change in shape, change in volume, change in state
Give 3 examples of physical properties.
color, shape,, size
What is another name for a homogeneous mixture?
Solution
What is NOT a mixture?
a compound
What is a characteristic of matter that allows it to change to something new?
Chemical change
Give three examples of chemical changes.
Cleaning tarnished silver, wood burning, iron rusting
Give an example of both chemical and physical weathering.
C- Limestone reacting with acids
P- Rocks split when water expands
Magnetism easily separates what mixture?
Iron or Steel
When mercury oxide is heated, it forms mercury and oxygen. How many grams of oxygen are formed if 45 g of mercury oxide reacts and 24 g of mercury was formed?
69 g
What is fog an example of?
A colloid
What is the shape of an apple considered?
A physical property
When two or more substances are combined so each substance can be separated by physical means, what is the result?
A mixture
What are all synthetic elements?
radioactive and unstable
What do two or more elements combine to form?
A compound
Which element has an atomic number of 2?
Helium
How many protons does Lithium have?
3
How many protons does Uranium-238 have?
92
