Air, DNA, water, atoms, table, chair, etc. Anything that has mass and volume
100
BN is an example of __________________ (an element/compound)?
compound
100
What type of element is titanium (be specific)?
Transition Metal
100
How many valence electrons does calcium, Ca, have?
2
100
What type of atoms make up covalent bonds?
Nonmetals
200
What piece of lab equipment do you use to measure mass?
Scale or Balance
200
What is the chemical formula for liquid bromine?
Br (l)
200
What subatomic particle has a charge of 0 and a mass of 1 amu?
Neutron
200
How many electrons will nitrogen, N, gain or lose? What will its charge be?
gain 3 electrons, charge of 3-
200
An unknown substance is a malleable solid that conducts but does not dissolve. What type of bonds does this substance have?
Metallic
300
Give an example of an intensive property.
Color, density, flammability, conductivity, solubility, malleability, etc.
300
What does the Law of Conservation of Mass say?
Matter cannot be created or destroyed.
300
Describe what isotopes are.
Isotopes are atoms of the same element with different number of neutrons (different masses)
300
What is the correct chemical formula for an ionic compound with magnesium and chlorine? What is the name of this compound?
magnesium chloride, MgCl2
300
An unknown substance is a liquid. It dissolves but does not conduct. What type of bonds does this substance have?
Covalent.
400
What is the mass of a piece gold with a density of 19.3 g/mL and a volume of 6.2mL?
m = 3.11g
400
Give an example of a physical property.
color, size, conductivity, solubility, malleability, mass, volume, density, etc.
400
What is the isotope symbol and isotope name for a lithium atom with 4 neutrons?
lithium-7
7
3Li
400
What is the charge of the chromate ion?
Ga3(Cr2O7)2
2-
400
Name AT LEAST 2 properties of an ionic compound.
soluble in water, conducts when dissolved, brittle solid
500
What is the formula for density? Describe what density is.
D=m/v Density is how tightly packed (compact) the atoms of a substance are.
500
When you add nitric acid to solid copper, a brown gas and a blue solution are produced. Explain what happened to the copper using your understanding of elements, compounds, and the Law of Conservation of Matter.
The copper is not destroyed. It combines and recombines with other elements to form different compounds. In this case, the copper is in the blue solution as copper sulfate.
500
Would an atom of oxygen-16 or oxygen-18 be more unstable? Why?
oxygen-18 would be more unstable because the nucleus would be too large. There are too many protons and neutrons that would have to be held together so the nucleus would decay (break apart) over time.
500
What is the correct formula for an ionic compound made with magnesium and nitrate?
Mg(NO3)2
500
Why are substances with network covalent bonds so hard?
Each atom shares electrons with many other atoms in a grid-like structure and this creates a very rigid structure.