Midterm
When a chemical bond is between a metal and non-metal it is
ionic bonds
At a high elevation (like on top of a mountain) air pressure is less. This means water would boil at a ________ temperature
lower
What # of valance electrons do most atoms strive to attain?
8
All exempt for H, He (only need 2)
Water boils at what degree C
100
matter that is cannot be separated physically
substances
The number 9754 in scientific notation
9.754 x103
I have 3 different substances and their densities
1. density of 3.874 g/mL
2. Density of 1.8 g/mL
3. Water
Put them in order from least dense (1st listed) to most dense (bottom layer
3,2,1
using the terms below put in order based off of the slowest molecular movement to the fastest
1. gas
2. solid
3. plasma
4. liquid
2, 4, 1, 3
What is the oxidation number of the elements in group 15 (5)
3-
Is the following ionic or covalent? NAME the compound
SF2
covalent-
sulfer difluoride
What is the density of water.... remember your units!!!
1 g/mL
A cube has an edge of 2 cm and a mass of 5g. Calculate its density. Include correct units!
0.625 g/cm3
The mass number of an atom includes what particles?
protons and neutrons
What do we call the elements that have a completely filled shell
noble gas
A liquid with a low viscosity would pour _______ out of a container
fast
Independent
Write the chemical formula aluminum oxide
Al2O3
In an isotope, what subatomic particle changes?
neutron
the buoyant force on an object in fluid is equal to the weight of the fluid displaced by the object is known as
Typically, when most substances are in their solid state, they are more dense than their liquid state. Why is water an exception to the density rule with most substance.
When water freezes, it forms crystalline structure forming water air pockets and making ice less dense
Give 3 examples of a heterogenous mixture
trail mix
salad dressing
chocolate chip cookie
etc
Potassium forms an ionic bond with fluorine. Potassium will _____ an electron and fluorine will ____ an electron.
Fill in the blanks
loses, gains
a material's maximum resistance to breaking when stretched or pulled
tensile strength
A block of metal is placed into a graduated cylinder containing water. The water level rises from 45.0 mL to 72.0 mL. The density of the metal is 8.0 g/mL.
What is the mass of the metal block?
The mass of the metal block is 216 g.
There is a cube of steel. As a cube it sinks in a graduated cylinder displacing 20 mL. When shaped into a boat, it displaces 35 mL of water .
What is the mass of the cube? remember labels
What is the volume of the cube? remember the labels
mass = 35g
Volume= 20 mL