Test Preparation STACKS
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is a Mixture? | It is two or more SUBSTANCES with NO SET RATIO and NO INTERACTION BETWEEN MOLECULES.
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| What are MODELS used for? | They are used to
REPRESENT things that are
TOO SMALL or
TOO BIG to be seen directly.
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| What is a SUBSTANCE? | It is
MATTER that is made of
the SAME TYPE of ATOMS or MOLECULES
all the way through.
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| What is one difference between an everyday explanation and a scientific one? | In a Scientific explanation
QUALITATIVE and/or QUALITATIVE
DATA is COLLECTED
& that data
SUPPORTS the scientific CLAIM
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| What are the three important parts of a scientific explanation | The three important parts of a Scientific Explanation are
1) CLAIM
2) EVIDENCE
3) REASONING
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| What is a CLAIM? | It is a STATEMENT that
tells WHAT HAPPENED
or
ANSWERS a QUESTION
in
an INVESTIGATION or EXPERIMENT.
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| What is EVIDENCE? | It is the DATA COLLECTED
from OBSERVATIONS or TESTS
to SUPPORT a CLAIM.
It is
EVIDENCE that makes an explanation
SCIENTIFIC
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| What is REASONING? | It is a way (or method) of CONNECTING the EVIDENCE (DATA) to the CLAIM
by using
SCIENTIFIC PRINCIPLES (RULES)
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| What are two types of EVIDENCE | Two types of Evidence are
QUALITATIVE Evidence
(Describes what you observe in experiment)
and
QUANTITATIVE Evidence
(Measures what happens in experiment)
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| What is one Principle (Rule or Law) of Science tells us how properties relate to substances. | It is a PRINCIPLE (or Rule or Law) of Science that the Properties of a Substance (Color, Hardness, Solubility, Melting Point) are the same whatever may be the amount of matter in a sample.
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| Describe how the molecular structure of a substance helps us understand it? | It is the MOLECULAR STRUCTURE of a SUBSTANCE that causes it to have the PROPERTIES (color, hardness, solubility, melting point, density) by which we know WHAT it is.
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| What are the CLUES or SIGNS that a Chemical Reaction is occurring? | Some CLUES/SIGNS of a Chemical Reaction are:
1) BUBBLING, FIZZING, INCREASE OF VOLUME because of GAS FORMING
2) TEMPERATURE CHANGE without adding or removing heat
3) PRECIPITATE FORMS: a SOLID forms when two LIQUIDS interact
4) LIGHT PRODUCED
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| WHAT is a CHEMICAL REACTION? | A Chemical Reaction is
a PROCESS in which SUBSTANCES INTERACT to form NEW SUBSTANCES with different PROPERTIES (color, hardness, solubility, melting point, density).
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| How do MOLECULES of Substances in a MIXTURE interact. | The DO NOT INTERACT.
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| HOW do we KNOW if a chemical reaction occurs? | We know a Chemical Reaction occurs from
CHANGES IN PROPERTIES and other
CLUES or SIGNS
that are common to Chemical Reactions
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| Name some PROPERTIES of Substances that might change in a Chemical Reaction. | PROPERTIES of Substances that might change in a Chemical Reaction are:
COLOR,
HARDNESS,
SOLUBILITY IN WATER,
DENSITY,
MELTING POINT.
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| What are the REACTANTS of a Chemical Reaction? | In a Chemical Reaction the REACTANTS are the BEGINNING or ORIGINAL Substances—the “Old Stuff”.
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| What the PRODUCT of a Chemical Reaction? | The PRODUCT of a Chemical Reaction is (are) the END Substance(s).
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| What is a WORD EQUATION of a Chemical Reaction? | It is a way to use NAMES of SUBSTANCES to DESCRIBE what happens in a Chemical Reaction.
It describes what Reactants “interact to form” what Product(s).
Example:
Copper Sulfate plus acetic acid (reactants) interact to from copper acetate (product)
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| What are CHARACTERISTIC PROPERTIES? | They are the Properties that Substances have because of the MOLECULES or MOLECULAR STRUCTURES that make them up.
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| WHAT is a CHEMICAL REACTION (define to include Decomposition type & give examples) | A PROCESS in which ONE or MORE substances change their MOLECULAR STRUCTURE to form new SUBSTANCES.
Examples of DECOMPOSITION Chemical Reactions:
1) Water to Hydrogen and Oxygen gases 2)Dead animals, trees and plants to mostly Carbon Dioxide and Water
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