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_____ are substances that are made up of two or more elements which are chemically combined.
Compounds
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_____ is made from two or more substances that are physically combined.
Mixtures
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____ are substances that are made up of only one type of atom.
Elements or Pure Substances
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______ is anything that has both mass and volume.
Matter
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_______ is a solid, produced by a reaction that separates a solution.
Precipitate
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A _______ consists of a solute in a solvent.
Solution
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List two lab safety precautions.
- 1. Closed toe-shoes
- 2. Gloves
- 3. Wear a hair tie, if you have long hair
- 4. Goggles
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Which piece of equipment is used as a cover for the evaporating dish?
Watch glass
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Where is the hottest part of the Bunsen burner flame?
Bottom (the blue part)
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How do you take a meniscus reading?
Bottom of the curve
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Define what a heterogenous mixture and a homogenous mixture are and provide an example of each.
- Heterogenous- Looks different throughout
- (E.g. Chex mix, salad, etc.)
- Homogenous- Looks the same throughout
- (E.g. Saltwater, sugar water, air, etc.)
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Identify this piece of equipment:
Round Bottom Flask
-
Identify this piece of equipment:
Evaporation Dish
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Identify this piece of equipment:
Erlenmeyer Flask
-
Identify this piece of equipment:
Tongs
-
Identify this piece of equipment:
Beaker Tongs
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Identify this piece of equipment:
Crucible with Container
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Classify each of the following as an element, compound, homogeneous mixture, or heterogeneous mixture.
1) Table salt ____
2) Aluminum ____
3) Dirt ____
4) Sugar water ____
- 1) Compound
- 2) Element
- 3) Heterogenous Mixture
- 4) Homogenous Mixture
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Define the terms chemical and physical change.
- Chemical Change- Composition change
- Physical Change- State or form change
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Classify the following as chemical change or physical change.
1) Iron rusting _____
2) Ice melting _____
3) Evaporation _____
4) HCI reacting with Mg to create H2 gas ____
- 1) Chemical
- 2) Physical
- 3) Physical
- 4) Chemical
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Another name for a homogenous mixture is a _____.
Solution
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What are four indicators of a chemical reaction?
*Or name as many as you can!!!
- 1. Heat
- 2. Odor
- 3. Color Change
- 4. Formation of precipitate
- 5. Light
- 6. Gas
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Measurement and Density
"mL" is a unit that measures ______.
"cm" is a unit that measures _____.
"g" is a unit that measures _____.
"mm Hg" is a unit that measures _____.
"K" is a unit that measures ______.
- 1) volume
- 2) length
- 3) mass
- 4) volume change (pressure)
- 5) temperature
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Try these conversions....
1. 5000 mg = _____ g
2. 1L = ______ mL
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Write the following numbers in scientific notation.
1) 74,600 km
2) 0.0443 km
- 1) 7.46 x 10 42) 443 x 10-4
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Write the following numbers in ordinary notation.
1) 8.5 x 107 km
2) 9.67 x 10-4 km
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Define density. (Formula)
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The total number of protons and neutrons in the nucleus of an atom.
mass number
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The weighted average mass of the atoms.
average atomic mass
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1/12 the mass of a carbon-12 tom.
atomic mass unit
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The number of protons in the nucleus of an element.
atomic number
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Atoms with the same number of protons but different number of neutrons.
isotopes
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Negatively charged subatomic particle.
electron
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The smallest particle of an element that retains the properties of that element.
atom
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A counting unit; 6.022 x 1023
mole
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Positively charged subatomic particle.
proton
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Subatomic particle with no charge.
Neutron
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Suppose an atom has 27 protons and 32 neutrons. What is the mass number?
59
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Suppose an atom has 29 protons and 35 neutrons. How many electrons does it have?
29
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Suppose an isotope has a mass number of 27 and an atomic number of 13.
1)Write the hyphen notation for this isotope.
2) Write the nuclear symbol for this isotope.
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What is the BEST way to describe the nature of an electron?
-Negatively charged subatomic particle of an atom.
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What is electromagnetic radiation? Provide examples.
Electromagnetic radiation (EM radiation or EMR) is the radiant energy released by certain electromagnetic processes.
Visible light is one type of electromagnetic radiation; other familiar forms are invisible electromagnetic radiations, such as radio waves, infrared light and X rays.
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