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Questions and Answers
What of these processes is a chemical change, NOT a physical change?
What of these processes is a chemical change, NOT a physical change?
- melting ice
- the breaking of a pencil
- the burning of a match (correct)
- the dissolving of salt in water
- the boiling of mercury
One afternoon, a man painted his house brown. Two days later, however, the house caught on fire and burned down. What two changes occurred to the house?
One afternoon, a man painted his house brown. Two days later, however, the house caught on fire and burned down. What two changes occurred to the house?
- Neither physical nor chemical changes occurred.
- Both painting and burning were chemical changes. (correct)
- The painting was a chemical change and the burning was a chemical change.
- Both painting and burning were physical changes.
- The painting was a physical change and the burning was a chemical change.
Keeping in mind rounding and significant figures, what is 53/40/13.4?
Keeping in mind rounding and significant figures, what is 53/40/13.4?
- 6.3
- 5.5 (correct)
Which of the properties I) oxidation strength II) basicity III) reducing strength are chemical properties?
Which of the properties I) oxidation strength II) basicity III) reducing strength are chemical properties?
Which of the following is a physical change?
Which of the following is a physical change?
What is the proper solution to the following equation? (150. + 2.5 + 36.75) ÷ (6.60 + 0.173) =
What is the proper solution to the following equation? (150. + 2.5 + 36.75) ÷ (6.60 + 0.173) =
How many significant digits are found in 765.000?
How many significant digits are found in 765.000?
What is the answer with the proper significant figures for the following equation? (7.6 + 8.401) × 4.2 × 0.688 =
What is the answer with the proper significant figures for the following equation? (7.6 + 8.401) × 4.2 × 0.688 =
What is the proper solution to the following equation? (27.9 ÷ 4.0) - 7.6134 + 11.431
What is the proper solution to the following equation? (27.9 ÷ 4.0) - 7.6134 + 11.431
Calculate the quantity 97.6 cm - 1.690 cm.
Calculate the quantity 97.6 cm - 1.690 cm.
Keeping in mind the rules for significant digits, subtract 8.38 cm from 9.7 cm.
Keeping in mind the rules for significant digits, subtract 8.38 cm from 9.7 cm.
The major importance of significant figures is
The major importance of significant figures is
Keeping in mind scientific notation, rounding, and significant figures, what is 23 × 10?
Keeping in mind scientific notation, rounding, and significant figures, what is 23 × 10?
? refers to how closely a measured value agrees with the correct value.
? refers to how closely a measured value agrees with the correct value.
? refers to how closely individual measurements agree with each other.
? refers to how closely individual measurements agree with each other.
You bought a 5 pound bag of sugar at H.Ε.Β. Not trusting the store, you weighed the sugar at home to make sure that you got what you paid for. Your scale reports that the store's 5 pound bag of sugar does weigh 5 lbs. This is an example of
You bought a 5 pound bag of sugar at H.Ε.Β. Not trusting the store, you weighed the sugar at home to make sure that you got what you paid for. Your scale reports that the store's 5 pound bag of sugar does weigh 5 lbs. This is an example of
You have a reported 1 pound bar of gold, but every time you weigh it, the scale reports that it weighs 937.00 g. This is an example of
You have a reported 1 pound bar of gold, but every time you weigh it, the scale reports that it weighs 937.00 g. This is an example of
The number 8.314 written in scientific notation becomes
The number 8.314 written in scientific notation becomes
The number 2 × 1015 is
The number 2 × 1015 is
What is 0.00397 in scientific notation?
What is 0.00397 in scientific notation?
The quantity 0.0000064 g expressed in scientific notation is
The quantity 0.0000064 g expressed in scientific notation is
Which is the biggest number?
Which is the biggest number?
The measurement 3.2 × 10-3 g could also be written as
The measurement 3.2 × 10-3 g could also be written as
Flashcards
Chemical Change
Chemical Change
A change in the chemical composition of a substance, resulting in the formation of new substances with different properties.
Physical Change
Physical Change
A change in the physical appearance or state of a substance, but not its chemical composition.
Physical Property
Physical Property
A property that can be observed or measured without changing the chemical composition of the substance.
Chemical Property
Chemical Property
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Mixture
Mixture
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Element
Element
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Compound
Compound
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Atom
Atom
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Nucleus
Nucleus
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Proton
Proton
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Neutron
Neutron
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Electron
Electron
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Atomic Number
Atomic Number
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Mass Number
Mass Number
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Isotopes
Isotopes
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Nuclide Symbol
Nuclide Symbol
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Average Atomic Mass
Average Atomic Mass
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Scientific Notation
Scientific Notation
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Metric Prefixes
Metric Prefixes
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Accuracy
Accuracy
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Precision
Precision
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Solid
Solid
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Liquid
Liquid
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Gas
Gas
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Vaporization
Vaporization
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Sublimation
Sublimation
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Specific Heat
Specific Heat
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Solution
Solution
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Heterogeneous Mixture
Heterogeneous Mixture
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Pure Substance
Pure Substance
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Study Notes
Chemical vs. Physical Changes
- A chemical change results in a new substance, while a physical change does not.
- Dissolving salt in water is a physical change.
- Boiling mercury is a physical change
- Burning a match is a chemical change.
- Painting a house, then the house burning down, shows both types of changes
- Melting ice is physical.
- Breaking a pencil is physical.
Significant Figures
- When performing calculations, pay attention to significant figures
Properties of Elements
- Elements can be distinguished by their hardness, brittleness, density, and transparency.
Physical Changes
- A physical change alters a substance's form, not its chemical composition.
- For example, a liquid evaporating is a physical change.
Scientific Notation
- Use scientific notation to express very large or very small numbers in a concise way
- Example: 0.00397 is 3.97 × 10⁻³
Atomic Structure
- Atoms are composed of subatomic particles, including protons, neutrons, and electrons.
- Protons have a positive charge, neutrons have no charge, and electrons have a negative charge.
Isotopes
- Isotopes are atoms of the same element that have different numbers of neutrons.
Atomic Mass
- The average atomic mass of an element considers the abundance of its isotopes.
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