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SCI 105 final
Terms in this set (33)
Is Chemistry the study of the submicroscopic, the microscopic or macroscopic or all three?
All because most everything is made up of atoms and molecules
Which of the following would be considered applied research?
Determining the lightest and strongest metal to be used for an airplane wing
The following image describes which of the following changes? really tight particles to spread out particles
A physical change
The boiling point of methanol is 65 degrees C, and the BP of ethanol is 78 C, which is true?
At 70 c you would have methanol gas and liquid ethanol
A sample of iron weighs more after it rusts bc
of the additional oxygen it contains
Whens atom are no longer connected the same what is that representative of?
Classify the following changes: Wood burns to ashes, water begins to boil, grass grows, a rock is crushed to powder.
Chemical, Physical, Chemical, Physical
Each night you measure your height. When you wake up you are one inch taller than last night but still the same as when you woke up the morning before. Physical or chemical?
Physically because it is readily reversible
Oxygen atoms are used to make water molecules. Does that mean that oxygen, O2 and water H20 have similar properties?
No, compounds are uniquely different from the elements from which they are made from.
If you eat metallic sodium or inhale chlorine gas, you stand a strong chance of dying. Let these two elements react with each other and you can safely put it on your popcorn. Why?
Sodium Chloride has nothing in common with sodium and chlorine.
The concept of a chemical bond is
how two or more atoms are held together
Which is a correct electron dot structure for chlorine?
The one with 7 electrons
Which has the greatest amount of non bonding pairs of electrons?
F, the one with 8 electrons
How is the number of unpaired valence electrons and the number of bonds that an atom can form related?
The number of unpaired valence electrons in an atom is the same as the number of bonds that the atom can form.
Which of the following will form an ion with a +2 charge?
Which of the following contains ionic bonds?
K20 (metal + nonmetal) more ionic the farther they are from eachother.
What property of metal atoms account for many of the observed bulk phenomena seen in the metal samples?
Metal atom easily lose one of more outer electrons
What is the difference between ionic and covalent bonds?
One is sharing a pair of electrons, the other is the transfer of at least one electron.
How many covalent bonds would the following usually form? 3 unpaired electrons
3! unpaired electrons=covalent bonds
Which of the following contain a dipole?
What is happening at the molecular level when a poler molecule like water interacts with a typical sodium ion?
The water molecule aligns such that the hydrogens interact with the sodium.
Main difference between dipole-dipole and a dipole-induced dipole interaction?
They are similar but one involves a temporary dipole created by a permanent dipole.
What is the difference between a compound and a mixture?
A compound cannot physically be separated into its components but a mixture CAN.
Which of the following is a heterogenous mixture?
Salad dressing .
When blue food coloring is stirred into water, the result is a....?
Homogenous mixture called a solution .
How does a suspension differ from a solution?
Both are homogenous mixtures, only the components of a suspension will separate by spinning the mixture in a centrifuge.
A solution with one teaspoon of sugar and one liter of water, which is the solute?
Sugar (solute is the smaller thing in the solution).
What is a saturated solution?
A solution where the solvent can not dissolve anymore.
Which is most concentrated?
One liter of water with 10 grams of sugar.
How are intermolecular forced and solubility related?
Solubility depends on the solvents ability to overcome the intermolecular forces in a solid.
How is the solubility of a gas affected by temperature?
As temp goes down, the solubility goes up. Opposite relationship!!!
A solid has a solubility at room temp of 78 grams per liter. If 1.0 L of a hot solution containing 100 g. of solute is cooled to the room how much solid is formed?
100-78= 22 grams!
What is a chemical reaction?
When one of more new compounds are formed by rearranging atoms.
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