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Chemistry
Page 56
Questions (96,731)
Air is composed of many different gasses, while water is a pure substance. Which choice best compares air and water?(1 point)
Res
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Maya heats a liquid until it changes to gass what type of change occurs to the liquid
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A cut apple reacts with the oxygen in the air after being cut by turning dark, which is a physical change.(1 point) Responses
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A scientist discovers a stack of newspapers is burned completely to ash in his laboratory. How does the resulting mass relate to
1 answer
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The picture below shows the particles in one section of an unknown pure substance. Which option represents the particles in
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william Alexaner
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A person mixes two liquids together as shown in the illustration below.
The person can conclude that there was a chemical change
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Which statement about this atom is FALSE?
Use the Periodic Table to help you. (1 point) Responses The atomic number of this atom
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Which are particles that make up the nucleus of an atom? Select the two correct answers. (1 point)
Responses protons protons
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Two different chemicals react and bond together. What do they become?(1 point)
Responses a solution a solution an element an
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Elements can chemically combine with other elements to form which of the following?(1 point)
Responses other elements other
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the atomic mass unit is equivalent to 1/12 of the mass of a neutral atom of which element?
A. carbon B. gold C. oxygen D.
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Select the element from the choices below.(1 point)
Responses HCl HCl NaCl NaCl O O MgBr
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@~@
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There are 3 unknown substances A, B, and C that need to be classified as element, mixture or compound.. Substance A can be
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There are 3 unknown substances A, B, and C that need to be classified as element, mixture or compound.. Substance A can be
1 answer
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@~@
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Which of the following is a physical property of potassium?(1 point)
Responses Combustibility Combustibility Reactivity with acid
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@~@
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Which element does NOT have similar chemical properties to neon (Ne)?
(1 point) Responses He He Xe Xe F F Ar
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@~@
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Which statement about this atom is FALSE?
Use the Periodic Table to help you. (1 point) Responses This is a chlorine atom. This
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@~@
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Sharon combines potassium (K) and water (H2O), producing potassium hydroxide (KOH) and hydrogen(H2), as shown in the chemical
3 answers
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@~@
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All the statements about metals are accurate except(1 point)
Responses metals are malleable and have a shiny luster metals are
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yes
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It turns out that the van der Waals constant b
equals four times the total volume actually occupied by the molecules of a mole of
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The mass of uranium atom is 3.95×10 -22 grams the massive oxygen molecule is 5.31×10 -23 g² how many times greater is the
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Which of the following is the cleanest-burning fossil fuel?(1 point)
Responses carbon carbon crude oil crude oil coal coal
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select the element from the choices below
responses: Mgbr O HCI NaCI
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which statement is true?
responses: an object melts as the particles slow down particles in an object move faster ar 50*c than at
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which of the following is a physical property of potassium?
responses: reactivity with acid flammability combustibility freezing
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true or false: a cut apple reacts with the oxygen in the air after being cut by turning dark, which is a physical change
1 answer
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According to the law of conservation of mass, which statement about chemical reactions is always true?
A. the states of the
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For each of the following elements listed below please identify the ionic state each element forms ionic bonds as. For example,
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If you have a polyatomic anion of Ammonium (NH41+), how many valence electrons must your Lewis Structure have?
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Can you help me with this
How much of a 0.3M stock solution of sucrose would you need to make a 150mL dilution of sucrose at
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Which of the following is a physical property of potassium?(1 point)
Responses Reactivity with acid Reactivity with acid
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A scientist has compiled the table below to show the composition of an unknown atom.
(1 point) Responses Sulfur Sulfur Silicon
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Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl Element Mass of an Atom (amu) Fe 56 Cl 35
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Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl Element Mass of an Atom (amu) Fe 56 Cl 35
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jayla did an investigation about the different states of matter. as part of the investigation, she wanted to change a liquid
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Sharon Comines potassium (k) and water(h2O), producing potassium hydroxide
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The Composition of Atoms Quick Check
1 of 41 of 4 Items Question A model of an atom shows eight electrons in rings that represent
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Anoumous
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The sandwich example relates to the Law of Conservation of Matter for Chemical Equations. Matter cannot be created nor
3 answers
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The molar mass of ammonium acetate is 77.083 g/mol. A student uses 0.100 mol of ammonium acetate in a chemical reaction. The
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Any change to a substance that changes the form with out changing the substance is a ___________ change(1 point)
Responses
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Select the element from the choices below.(1 point)
Responses MgBr MgBr NaCl NaCl HCl HCl O
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hi :)
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The table below shows the densities of three contrasting liquids.
Based on density, which picture shows how these liquids would
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hi :)
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Which of the following will NOT happen when a liquid undergoes a physical change?(1 point)
Responses The motion of the molecules
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hi :)
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Maya heats a liquid until it changes to a gas. What type of change occurs to the liquid?(1 point)
Responses Physical Physical
1 answer
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hi :)
27 views
A scientist discovers a stack of newspapers is burned completely to ash in his laboratory. How does the resulting mass relate to
1 answer
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hi :)
31 views
Use the equation of sodium chloride dissolving in water to complete the activity.
NaCI(s) = Na*(aq) + CI (aq) A student is
1 answer
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Chromate ions react according to the following equation, where the left side of the reaction is yellow and the right side is
3 answers
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A student adds sodium hydroxide (NaOH to the solution at equilibrium. In one to two sentences, describe and explain any changes
1 answer
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A student makes two mixtures, both made of the same substances. What must be true of the two mixtures? * 1 point Both mixtures
1 answer
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william Alexaner
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Pure water and pure salt are poor conductors of electricity. When salt is dissolved in water, the resulting solution conducts
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young hell born demon
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