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Chemical Reactions

DHS PS Ch 19 (2018/2019)

QuestionAnswer
Change of one or more substances converted into new substances describes a ______ ________? chemical reaction
Substances that combine or change in a chemical reaction are ____? reactants
New substance that are produced in a chemical reaction are called __________? products
A law which states that, in a chemical reaction, matter is not created or destroyed; it stays the same is __________? Conservation of Mass
What are coefficients? numbers which represent the number of units of each substance in a reaction
Knowing coefficients of chemical reactions allowed chemists to do what? use the correct amounts of reactants to predict the amounts of products produced.
What is a subscript? number which represents the number of atoms in a molecule of a particular element
In a chemical equation what side of the will you find the products? to the right of the arrow
In a chemical equation what side will you find the reactants? to the left of the arrow
In order for an equation to be balanced, the same number of ____ must be on each side of the equation. atoms
Whom is known as the father of modern chemistry? Lavoiser
What type of chemical equation has the same number of atoms of each element on each side of the equation? balanced
A way to describe a chemical reaction using chemical formulas and symbols is? a chemical equation
How many atoms are present in 4 H2O? 12
Ten grams of calcium oxide react to produce 9.3g of calcium and _g of oxygen. What is the mass of the oxygen produced? 0.7g
What does it mean for a chemical equation to be balanced? The same number of atoms of each element is on both sides of the equation.
Correct coefficient for mercury (II) oxide in the following equation: ___ HgO=> 2Hg+ O2? 2
Why is oxygen written with a subscript 2? It exists as a diatomic molecule.
According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product? 2
Show a balanced chemical equation for the synthesis of NaBr from Na and Br2? 2Na+Br2=2NaBr
Which reactant correctly balances the following equation: 4Al+ ______=> 2Al2O3? 3O2
Balance the following equation: __ H2SO4+ __ NaNO2=> HNO2+ Na2SO4 1,2,2,1
An insoluble compound that comes out of solution during a double displacement reaction is called a? precipitate
General formulas represents a single-displacement reaction? A+BC=>AC+B
What type of reaction is shown in the following chemical equation: NH3+HCl=>NH4Cl? synthesis
The formula AB=>A+B represents what type of chemical reaction? decomposition
What type of reaction is represented by the following equation: 2H2+O2=>2H2O? synthesis
What type of reaction produces a precipitate? Double displacement
In a _____ reaction, two or more substances combine to form another substance. Synthesis
Which of the following could represent a decomposition reaction? Compound --> element + element
Following equation represents what type of chemical reaction: 2H2(g)+ O2(g)-->2H2O(g)? synthesis
As a result of the experiments of Lavoisier, you know that in a chemical reaction the mass of the products ______. Always equals the mass of the reactants
A substance that speeds up a chemical reaction without being permanently changed itself is a(n)______. Catalyst
Rust forming on a car body would be an example of __ __________ ______________? a chemical reaction
Substances that prevent, or slow down, chemical reactions are called ____. Inhibitors
Symbols in chemical equation means "produces," "yields", or "forms" -->
The burning of wood in a campfire that produces heat and light would be both an ______ and an ______ reaction. Exergonic, Exothermic
If heat must be added to a chemical reaction for the reaction to take place, the reaction is ______. Endothermic
The energy required to break the original bonds is less than engergy released when new bonds form in a(n) Exergonic
In a chemical equation, the symbol that means dissolved in water is ______. (aq)
The type of reaction that produces more energy than is required is called _____. Exergonic
If heat must be added to a chemical reaction for the reaction to take place, the reaction is _____. Endothermic
When one element replaces another element in a compound, the reaction is a _____ reaction. Single-displacement
The breaking down of a substance into two or more simpler substances is _____. Decomposition
Substances that prevent, or slow down, chemical reactions are called _____. Inhibitors
A chemical reaction in which heat energy is released is _____. Exothermic
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactions? The masses are equal.
What is an insoluble compound that forms during a chemical reaction? Precipitate
A chemical reaction in which two or more substances combine to form another substance is called a _____. Synthesis reaction
When most chemical reactions take place, some _____ in the reactants must be broken, a process that requires energy. Chemical bonds
The process by which hydrogen and oxygen form water can be classified as a _____. Synthesis reaction
TRUE/FALSE: An ice cube melts into liquid water is an example of a chemical reaction. False
AB + CD --> AD + CB is an example of a _____ reaction. Double-displacement
Why would a catalyst be added to a chemical reaction? To speed up a reaction
Some reactions require an input of energy in order to occur. Photosynthesis, the process in which plants use light to make sugars, requires an energy input. This reaction would be classified as _____. endergonic
A change in which one or more substances are converted into new substances is called a _____. chemical reaction
How would a relationship between reactants and products be shown? reactants --> products
What does the law of conservation of mass state? Matter cannot be created or destroyed, but is conserved.
According to the law of conservation of mass, if 4 g of O combine with 2 g of H, how many grams of H2O are produced? 6g
The symbol (s)used in a reaction stands for a _____. solid
The symbol (l) used in a reaction stands for a _____. liquid
The symbol (g) used in a reaction stands for a _____. gas
The symbol (aq) used in a reaction stands for _____. aqueous or dissolved in H2O
What is the function of coefficients in a chemical equation? They act as unit managers representing the number of units of each substance taking part in a reaction.
A number below and to the right of a symbol indicating the number of atoms is called a _____. subscript
An equation that has the same number of atoms on each side is called a ________. balanced chemical equation
Why do we balance chemical equations? to satisfy the law of conservation of mass
When balancing chemical equations, you are only allowed to change the _____. coefficients
What coefficient is assumed if no coefficient is written before a formula in a chemical equation? 1
The physical forms in which all matter naturally exists, solid, liquid, and gas, are called _____. states of matter
This occurs when a substance reacts with oxygen to produce energy in the form of heat and light. combustion reaction
What would be an example of a combustion reaction? whenever something burns : fireworks, candle, campfire, engine, furnace, grill, etc.
When hydrogen burns in oxygen to form water, this type of reaction occurs. synthesis
TRUE/FALSE: When H2O is broken down into hydrogen and oxygen gases, a decomposition reaction takes place. true
Most decomposition reactions require the use of _____, _____, or _____. heat, light, electricity
When copper wire is placed in a solution of silver nitrate to produce a copper nitrate sloution and silver on the wire, this is an example of a _____ reaction. single-displacement
Why do metals such as copper, silver, and gold exist as pure elements? They are the least active of the metals on the list.
A _____ reaction occurs when barium nitrate reacts with potassium sulfate to produce barium sulfate and potassium nitrate. double-displacement
What type of reaction produces a precipitate? double-displacement reaction
A _____ is the force that holds two atoms together. chemical bond
Chemical reactions that release energy are called a(n) __________ reaction. exergonic
Chemical reactions that release energy, primarily in the form of thermal energy are _____. exothermic
A ______ reaction requires energy. endergonic
Chemical reactions that require energy in the form of thermal energy are _____. endothermic
A _____ is a substance that speeds up a chemical reaction without being permanently changed itself. catalyst
A substance used to slow down a chemical reaction is a(n) _____. inhibitor
All chemical reactions ______ or _____ energy. release, absorb
What are four examples of energy associated with chemical reactions? thermal, light, sound, & electricity
A plastic chair breaking down in the presence of sunlight is an _____ reaction. endergonic (requires light)
Logs burning in a campfire would be an example of what type(s) of reaction? exergonic (produces light and sound), exothermic (produces heat)
A firefly would be an example of _____. exergonic (produces light)
An instant cold pack is an example of what type(s) of reaction? endothermic
What type of reaction would a hand warmer pack be? exothermic
A change in which one or more substances are converted into a new substance is called a(n) _____ reaction. chemical
If a precipitate, water, or a gas forms when two ionic compounds in solution are combined, the reaction is a(n) _____ reaction. double-displacement
A substance that prevents certain chemical reactions is a(n) _____. inhibitor
When two or more substances combine in a chemcial reaction to form another substance, a(n) _____ reaction has taken place. synthesis
The breakdown of a substance into two or more simpler substances is a(n) _____ reaction. decomposition
In a chemical equation, the substances that react are called _____. reactant
A substance that speeds up a chemical reaction without itself being permanently changed is a(n) _____. catalyst
A reaction that requires energy in the form of heat is a(n) _____ reaction. endothermic
When one element replaces another in a compound, a(n) _____ reaction has occurred. single-displacement
If the energy released in a chemical reaction is primarily in the form of heat, that reaction is a(n) ______ reaction. exothermic
Numbers in front of the symbols and formulas in an equation are called _____. coefficients
If the number of atoms of each element on the left side of an equation is equal to the number of atoms of each element on the right side of the equation, the equation is ______. balanced
In a chemical equation, the substances that are produced are called ______. products
An insoluble solid that forms when two ionic compounds in solution are combined is a(n) ______. precipitate
What is the symbol for a solid? (s)
What is the symbol for a gas? (g)
What is the symbol for a liquid? (l)
What is the symbol for an aqueous solution? (aq)
Why is it important to show chemical reactions in a balanced form? The law of conservation of mass states that matter cannot be created or destroyed so there must be the same mass on both sides.
The temperature of the beaker holding the reacting substances increased causing a(n) ______ reaction. exothermic
The temperature of the beaker holding the reacting substances decreased causing a(n) ______. endothermic
Frost formed on the outside of the beaker holding the reacting substances causing a)n) ______. endothermic
Name 4 factors that affect reaction rates. temperature, concentration, volume/pressure, and surface area
A state in which forward and reverse reactions or processes proceed at equal rates. equilibrium
Carbon Dioxide continually escapes and reenters soda is an example of ____________ _______________. physical equilibrium
Baking cookies is an example of an ____________ reaction because it requires heat. endothermic
The electrolysis of water is an ____________ reaction because it requires electricity. endergonic
A chemical reaction inside the abdomen of a firefly produces light is an _______________ reaction. exergonic
Coal power plants burn coal to produce energy. This is an example of an ______________ reaction. exothermic
Oxidation involves the __________ of electrons. loss
Reduction involves the __________ of electrons. gain
All combustion reactions require __________ . oxygen
The amount of a substance that contains 6.02 x E23 particles of that substance. mole
The mass in grams of one mole of a substance is called its ______________ ____________ . molar mass
If you increase the temperature of a chemical reaction, the rate of reaction ________________. increases
If you increase the concentration of a chemical in a chemical reaction, the rate of reaction ________________. increases
If you increase the volume of a chemical reaction, the rate of reaction ________________. decreases
If you increase the pressure of a chemical reaction, the rate of reaction ________________. increases
If you increase the surface area of a chemical in a chemical reaction, the rate of reaction ________________. increases
Created by: pherriman