Science Ch 4 Word Scramble

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Question	Answer
A rapid reaction between oxygen and a fuel is known as...	combustion
The only sure evidence for a chemical reaction is...	the production of one or more new substances
What happens when chemical bonds break and new bonds form?	a chemical reaction
Every chemical reaction involves a change in...	energy
CaCO3 represents a chemical...	formula
What type of reaction is FeS + 2HCl --->FcCl2 + H2S?	a double replacement reaction
Which two processes could be considered opposites?	a synthesis reaction and a decomposition reaction
A material used to decrease the rate of a chemical reaction is an...	inhibitor
The principle of conservation of mass is true...	for reactions in both open and closed systems
In what way can a fire be brought under control?	Remove oxygen
When a chemical reaction takes place in an open system,	matter can enter from or escape to the surroundings
The number placed below an element's symbol in a chemical formula is called a...	subscript
Chemicals that act as biological catalysts by speeding up reactions in living things are...	enzymes
What is the best form of fire safety?	fire prevention
The best way to put out a small kitchen fire is to...	cover it or use a home fire extinguisher
Which of the following is a balanced chemical equation?	2Fe2O3 + 3C ---> 4Fe + 3CO2
A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be...	balanced
A shorter, easier way to show chemical reactions, using symbols instead of words, is called a...	chemical equation
Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.	2Na + O2 ---> Na2O
In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the...	number of molecules or atoms or each substance in the reaction
In chemical reactions, what does the principle of conservation of mass mean?	matter is not created or destroyed
The minimum amount of energy that has to be added to start a reaction is the...	activation energy
Anything that has mass and takes up space is considered...	matter
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a...	decomposition reaction
Which of the following is NOT a correct inference that you can make about the burning of gasoline - Chemical bonds are broken and others are formed; New substances are produced; The reaction is a physical change.	The reaction is a physical change
Which of the following does NOT increase the number of particles of a substance available to react in a chemical reaction - increasing the concentration; increasing the surface area; adding a catalyst	adding a catalyst
Chemistry is...	the study of matter and how matter changes
A chemical reaction that absorbs energy in the form of heat is described as...	endothermic
Which of the following is an example of how to supply activation energy to begin a reaction?	Heat the reaction flask on a hot plate
The substances listed on the left side of a chemical equation are the...	reactants
The rate of a chemical reaction is _________ of temperature.	dependent
A chemical reaction may be detected by observing changes in the ...	properties of matter
_______ is the process of making a more complex compound from simpler substances.	Synthesis
A change that produces a new substance is a...	chemical change
A gas necessary for combustion to take place is...	oxygen
In a chemical reaction, _________ are formed or broken.	chemical bonds
The home fires that cause the most deaths start from carelessness with ________	cigarettes
Chemical reactions that absorb energy are said to be _________.	endothermic
The materials present at the beginning of a chemical reaction are called the _________.	reactants
When added to a fire, water ______ and prevents the fuel from coming in contact with oxygen.	cools
In a chemical equation, the substances written on the right side of the arrow are called _________.	products
In a chemical equation, a ________ tells you how many atoms or molecules of a reactant or a product take part in a reaction.	coefficient
The _________ is the minimum amount of energy that must be added to start a chemical reaction.	activation energy
A fuel is a material that will release _______ when it burns.	energy
The process of solid ice changing into liquid water is a ________ change.	physical
A material used to decrease the rate of a reaction is called an _________.	inhibitor
The ________ is the amount of one material present in a given volume of another material.	concentration
________ changes occur when bonds form between atoms, or when bonds break and new bonds form.	Chemical
A chemical reaction that releases energy in the form of heat is an ________ reaction.	exothermic
One of the most effective ways to fight a small fire is to use a __________.	fire extinguisher
The principle of ______________ states that during a chemical reaction, matter is not created or destroyed	Conservation of Mass
A burning match is an example of an ____________ where matter can enter from or escape to the surroundings.	open system
A wet log will not burn easily because a large amount of _________ must be added to the log to evaporate the water.	heat
The production of a gas when acid is added to a sample of chalk is an indication of a __________ reaction.	chemical
A reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a __________ reaction.	replacement
In a _________ change, elements and/or compounds rearrange to form new substances.	chemical
In a __________ reaction, the products are simpler substances than the reactant.	decomposition
The ______________ of a compound shows the ratio of elements present in the compound.	chemical formula
A precipitate is a _________ that forms from solution during a chemical reaction.	solid
a symbolic way to show a chemical reaction	chemical equation
energy needed to start a chemical reaction	activation energy
produces a new substance	chemical change
speeds up a chemical reaction	catalyst
substances undergo chemical change	chemical reaction
symbols and subscripts that represent a compound	chemical formula
the force that holds atoms together as compounds	chemical bond
the smallest particle of an element	atom
a chemical reaction that breaks down one substance into two or more substances	decomposition
a number placed in front of a formula	coefficient
combining fuel with oxygen to produce fire	combustion
matter cannot be created or destroyed during a chemical reaction	conservation of mass
the amount of matter in a given volume	concentration
two or more elements chemically combined	compound
a biological catalyst	enzyme
a chemical reaction that releases heat	exothermic reaction
a substance that releases energy when it burns	fuel
a substance that slows a chemical reaction	inhibitor
does not create a new substance	physical change
two or more atoms	molecule
two or more substances not chemically combined	mixture
a chemical reaction where one substance REPLACES another in a compound	REPLACEment reaction
a chemical reaction where two or more substances combine to form one substance	synthesis
a mixture with substances spread evenly	solution
a number in a formula that tells the number of atoms of a particular element	subscript
a solid that forms from solution during a reaction	precipitate
letters used to identify elements	symbol
substances formed during a chemical reaction	products
substances that enter into a chemical reaction	reactants
cannot be broken down in to a simpler substance	element

Created by: 8thgraders