Science Chemistry Assessment 8th Grade

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Flashcards by mellowsmiley122, updated more than 1 year ago
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Flashcards on Science Chemistry Assessment 8th Grade, created by mellowsmiley122 on 01/05/2015.
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Question Answer
The pH of a nearby stream is tested and found to be basic. What pH could be a valid result from the testing of the stream? Greater than 7
Which mixture can be classified as a solution? A. air B. fruit salad C. H2O D. liquid nitrogen air
How many total atoms are found in one molecule of H2O? 3
Which method of separation can be used for a heterogeneous mixture? A. by distillation B. by densities C. by chromatography D. by acidification Densities
What only happens during a chemical reaction? New substances are formed
What describes a process where a precipitate is formed? A. A solution of AgNO3 is added to a solution of CaCl2 to produce solid AgCl and a solution of CaNO3. B. Propane gas combusts to form CO2 and H2O. C. A solution of HCl mixes with a solution of Ca(OH)2 to produce H2O and CaCl2. D. A solution of H2SO4 mixes with a solution of NaOH to produce water and Na2SO4. A solution of AgNO3 is added to a solution of CaCl2 to produce solid AgCl and a solution of CaNO3.
Which chemical equation describes the balanced reaction between magnesium and hydrochloric acid to form magnesium chloride and hydrogen gas? Mg + 2HCI -> MgCI2 + H2
What are the reactants in a cellular respiration? The material needed for the process: Glucose and oxygen
What are the products in a cellular respiration? the materials produced during the process: carbon dioxide and water
What is the properly balanced equation that shows the synthesis of limewater, Ca(OH)2, from calcium oxide and water? CaO + H2O → Ca(OH)2
What is the base of a Ph scale? Any number greater than 7
What is the correct formula for hydrogen gas? H2
What is the solutes in a simple mixture? the substance that can be dissolved
What is the solvent in a simple mixture? the mixture that is the one doing to dissolving, ex. water
Is the equation KMnO4 + HCl → KCl + MnCl2 + H2O + Cl2 balanced or not balanced? Explain. The equation is not balanced because the number of atoms of each element on the left is not equal to their numbers on the right.
What is an ionic bond? it is a bond formed by the attraction between two oppositely charged ions
What is a covalent bond? a chemical bond that involves the sharing of electron pairs between atoms
What is the difference between a covalent and an ionic bond? a covalent bond shares electrons where as an ionic bond transfers them
What is a homogeneous mixture? a mixture with uniform composition throughout
What is a heterogeneous mixture? type of mixture in which the composition can easily be identified since there are two or more phases present, not uniform composition
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