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100
Which of the following chemical structures cannot be broken down into smaller units of matter? A. compounds B. molecules C. substances D. atoms of an element
Atoms of an element
100
When two different elements react chemically, the products of the reaction will most likely: A. have a mixture of the chemical and physical properties of the original elements B. have the same chemical and physical properties as the original elements. C. have a greater total mass than the mass of the original elements. D. have different chemical and physical properties than the original elements.
D. have different chemical and physical properties than the original elements.
100
Many deep sea animals have structures with bioluminescence. Bioluminescence is a process in which light energy is released, allowing the animal to see in the dark. Bioluminescence is MOST likely caused by a(n) A. physical process B. chemical reaction C. reversible process D. endothermic reaction
B. chemical reaction
100
When methane is burned in oxygen, carbon dioxide and water vapor are the products. Since all the reactants are products are gases which are invisible, which clue tells you that a chemical reaction has taken place? A. new elements are rearranged B. new elements are produced C. heat is absorbed D. heat is produced
D. heat is produced.
100
Which of the following choices is why water can flow and take the shape of the glass you pour it into? A. the water molecules can move and slide past one another B. the water molecules have little free space between particles C. the water molecules have lots of free space between particles D. the water molecules have very little attraction for one another
A. the water molecules can move and slide past one another
200
After 2 different elements are heated together, the product has different chemical properties. This is evidence that the two elements have______ A. changes states B. reacted chemically C. evaporated D. formed a new atom
B. reacted chemically
200
Elements can form compounds and molecules through ___ A. chemical reactions B. physical reactions C. state changes D. chemical reactions, physical changes, and state changes
A. chemical reactions
200
When we change the state of matter we must add or remove heat or _____ A. compound B. sublimination C. energy D. pressure
C. energy
200
Which of the following can result in the formation of a new compound? A. mixing food coloring and water B. mixing iron fillings and iron nails C. combining sodium and chlorine to form sodium chloride D. melting a solid to form a liquid
C. combing sodium and chlorine to form sodium chloride
200
The chemical reaction equation CaCo3--> CaO + Co2 shows that ____ was applied. A. Faraday's Law B. Avogadro's Law C. conservation of matter D. conservation of energy
C. conservation of matter
300
Water and vegetable oil are examples of fluids, which are also called ____ A. solid B. gas C. liquid D. energy
C. liquid
300
The process in which liquid becomes a gas is called ___ A. Gas B. pressure C. sublimation D. evaporation
D. evaporation
300
Water and carbon dioxide are examples of __ A. compound B. energy C. vibration D. gas
A. compound
300
The chemical formula for glucose is C6H12O6. Glucose is made from carbon, hydrogen, and oxygen___ A. ionic compounds B. elements C. covalent compounds D. molecules
B. elements
300
Why would reactants at the beginning of a chemical reaction weight the same as the product at the end? A. the atoms are rearranged B. new atoms appear C. some atoms disappear D. a physical change took place
A. the atoms are rearranged
400
___ is when a material in a solid state moves straight to a gaseous state. A. sublimation B. pressure C. physical D. melting
A. sublimation
400
An example of a characteristic property of a substance is its melting point, which is a ____ property. A. solid B. chemical C. physical D. vibration
C. physical
400
The reverse process of melting is freezing, in which a liquid becomes a _ A. gas B. evaporation C. energy D. solid
D. solid
400
Hydrogen and oxygen gas chemically combine to form liquid water. In this chemical reaction, which of the following does not change as the reaction proceeds from reactants to products? A. the arrangement of the atoms B. the total mass C. the volume D. the physical state
B. the total mass
400
The law that states that atoms do not appear or disappear in chemical reactions, is the Law of ___ A. conservation of energy B. atom stability C. conservation of matter D. balancing equations
C. conservation of matter
500
The __ of the molecules of a substance determine if the state of that substance is a gas, a liquid, or a solid. A. pressure B. vibration C. evaporation D. liquid
B. vibration
500
A chemical formula, such as CO2 represents the: A. molecules that make up a compound B. compounds that make up an element C. elements that make up a compound D.compounds that make up a molecule
C. elements that make up a compound.
500
Net heat energy changes provide that chemical reactions have taken place. A chemical reaction in which heat has been absorbed in known as a(n): A. endothermic reaction B. exothermic reaction C. reversible reaction D. physical reaction
A. endothermic reaction
500
You are doing an experiment in class. In the 1st part you cool substance A (gas) until it becomes a liquid. Then you take substance B (gas), and pressurize it, forming a liquid. You then mix together substance A and B the reaction bubbles and get substance C which is a solid. Which of the following were PHYSICAL changes? A. cooling of substance A (turning it into a liquid) and mixing of substances A and B to form substance C. B. Adding pressure to substance B (turning it into a liquid) and the mixing of substances A and B to form C. C. Cooling of substance A (turning it into a liquid)and adding pressure to substance B (turning it into a liquid). D. Only the mixing of substances A and B to form substance C.
C. Cooling of substance A (turning it into a liquid) and adding pressure to substance B (turning it into a liquid).
500
Living organisms rely on many bimolecular compounds for their structure and function. These compounds are formed by combining___ A. elements B. protons C. neutrons D. ions
A. elements
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