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Grade 10 Chemistry

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Water is considered to be matter even though it often appears in a liquid form. This is explained by stating that like all matter, water has ____________________ and takes up space.   mass  
The ____________________ properties of sulphur include that it usually forms solid yellow crystals, and has a melting point of 115ºC.   physical  
An unknown sample that cannot be broken down any more by using chemical methods must be a(n) ____________________.   element  
Types of ____________________ include mechanical such as salad, suspensions like salad dressing, and solutions like iced tea.   mixtures matter  
The subatomic particle that is found in the nucleus and which has a charge is the ____________________.   proton  
The only important thing all of the elements in the same ____________________ on the periodic table have in common is the number of electron shells they have.   period row  
The most reactive group of elements on the metal side of the periodic table is _________________________.   alkali metals group 1 family 1  
The pattern of electrons appearing in the first three shells of the Bohr diagrams of elements is ____________________.   2, 8, 8  
A(n) ____________________ compound forms when, for example, a metal element and a non-metal element join by transferring electrons from the metal to the non-metal.   ionic  
The name of the ionic compound K2S is _________________________.   potassium sulphide  
Carbonate, CO32–, is a _________________________, a group of elements that behave like a single ion.   polyatomic ion  
When two non-metals form a molecular compound, their electrons are shared in a ____________________ bond.   covalent, molecular  
Acid   a compound that produces hydrogen ions when dissolved in water. Chemical Formula usually HX(X = monatomic or polyatomic ion). Chemical formula = H+  
Base   a compound that produces hydroxide ions when dissolved in water. Bases are named as if they were ionic compounds (the name of the cation followed by the name of the anion).  
Hydroxide Ion   A water molecule that loses a hydrogen ion and thus becomes negatively charged. Hydroxide ions are denoted OH-. (Do not conf. with hydronium ion)  
Hydronium Ion   A water molecule that gains a hydrogen ion and thus becomes positively charged. Hydronium ions are denoted H3O+. (Do not conf. with hydroxide ion)  
Neutral Solution   any aqueous solution in which [H+] and [OH-] are equal. For example pure water is a neutral substance. pH = 7.0 ([H+] = 1.0 x 10-7 mol/L)  
Acidic Solution   When the [H+] is greater than the [OH-]. Thus, the [H+] of an acidic solution is always greater than 1.0 x 10-7 mol/L. (don’t mix up with basic)  
Basic Solution   When the [H+] is less than the [OH-]. Thus, the [H+] of an acidic solution is always less than 1.0 x 10-7 mol/L. (don’t mix up with Acidic)  
Alkaline Solutions   another name for a basic solution.  
pH   the negative logarithm of the hydrogen-ion concentration. pH=-log[H+]. Always express in scientific notation.  
A reaction in which a compound breaks down into two or more elements or new compounds   Decomposition Reaction  
A number written in front of a chemical formula   Coefficient  
A solid produced during a chemical reaction in a solution   Precipitate  
A solution in which the solvent is water   Aqueous Solution  
A statement that uses chemical formulas to show the identities and relative amounts of the substances involved in a chemical reaction   Chemical Equation  
Substance dissolved in a solution   Solute  
A reaction in which oxygen combines with a substances and releases heat and light energy   Combustion Reaction  
A reaction in which the atoms of one element replace the atoms of another element in a compound   Single Replacement Reaction  
A reaction involving the exchange of positive ions between two compounds dissolved in water   Double Replacement Reaction  
The process by which the atoms of one or more substances are rearranged to form different substances   Chemical Reaction  
A starting substance in a chemical reaction   Reactant  
A substance formed during a chemical reaction   Product  
A reaction in which two or more substances react to produce a single product   Synthesis Reaction  
The most plentiful substance in a solution   Solvent  
What type of reaction does the following describe: Reactants - One Products - Two or more   Decomposition Reaction  
What type of reaction does the following describe: Reactants - Two Compounds Products - Two Compounds   Double Replacement Reaction  
What type of reaction does the following describe: Reactants - Two or more Products - One   Synthesis Reaction  
What type of reaction does the following describe: Reactants - An element and a compound Products - An element and a compound   Single Replacement Reaction  
The symbol (s) is used in an equation to designate the substance as a _____________   Solid  
The symbol (g) is used in an equation to designate the substance as a _____________   Gas  
The symbol (l) is used in an equation to designate the substance as a _____________   Liquid  
The symbol (aq) is used in an equation to designate the substance as a _____________   Aqueous  
In a balanced equation, the number of ____________ on the reactants side must match the number of _______________ on the products side   Particles(atoms)  
A(n) _______________ equation uses chemical formulas rather than words to identify the reactants and products   Skeleton  
Counting the atoms of the elements in the reactants is step ___ for balancing equations   2  
Changing the coefficients to make the number of atoms of each element equal on both sides of the equation is step ___ for balancing equations   4  
Writing the coefficients in their lowest possible ratio is step ___ for balancing equations   5  
Writing the skeleton equation for the reaction is step ____ for balancing equations   1  
"Mass is never created nor destroyed in a chemical reaction"... this is a statement of the...   Law of Conservation of Mass  
There are ___ types of chemical reactions   4  
The four types of chemical reactions are: Synthesis, __________, single replacement and double replacement   Decomposition  
A(n) _____________________, is a useful tool for determining whether a chemical reaction will occur and for determining the result of a single replacement reaction   Activity Series  
_________________ is an example of a single replacement reaction: 6CO2 + 6H2O --> C6H12O6 + 6O2   Photosynthesis  
Nonmetals will replace _____________ in a single replacement reaction   Nonmetals  
Metals will replace hydrogen or another, less ___________ metal in a single replacement reaction   Active  
(True/False) Fluorine is more reactive than iodine   TRUE  
(True/False) Bromine is more reactive than Fluorine   FALSE  
Two people coming together to dance is a 'life comparison' to a _____________ reaction   Synthesis  
Two people parting when the dance is over is a 'life comparison' to a _____________ reaction   Decomposition  
Two people dancing, and someone cuts in, is a 'life comparison' to a _____________ reaction   Single Replacement Reaction  
Two couples switching dance partners is a 'life comparison' to a _____________ reaction   Double Replacement Reaction  
Hydroxide   OH -  
Bromide   Br -  
Fluoride   F -  
Iodide   I -  
Chloride   Cl -  
whom should an accident or spill be reported to at school?   Teacher or Adult  
What should you wear when performing scientific activities?   always Googles, (Apron, and Gloves if necessary)  
First aid kit   used for cuts and burns  
fire extinguisher   used to put out fires  
Why can glass be a safety problem?   It can easily be broken and you can get cut.  
Why can eating or drinking be dangerous when performing scientific activities?   you could put something toxic or poisonous in your mouth  
Why shouldn't you play practical jokes or roughhouse when performing scientific activities?   Accidents can be dangerous and people can get hurt  
Why is it a good idea to tie back long hair or loose-fitting clothing when performing scientific activities?   Your hair or clothes could cause an accident.  
What is used for transferring very tiny amounts of liquid?   medicine dropper  
What is worn to protect your eyes?   cover googles, safety glasses  
What enlarges the size of small objects?   Hand lens/magnifying glass  
What round bottom straight neck glassware is used to store liquids?   Florence Flask  
What triangular glassware is used to store solutions?   Erlenmeyer Flask  
What is used for measuring or mixing liquids   Beaker  
What device is used for weighing?   Balance  
What frame or structure is used to hold test tubes?   Test tube rack  
What is used to measure the volume of liquids?   Graduated cylinder  
What holds liquids for observation or testing?   Test tube  
What device blocks openings?   Stopper  
What is used for grasping?   Forceps,tongs  
What instrument is used for measuring temperature?   Thermometer  
What assists in transferring liquids to containers with smaller openings?   funnel  


   






 
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