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Chemistry
Page 51
Questions (96,300)
Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O) to form 10 molecules of of carbon dioxide (CO2). According to
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scienze
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Titanium (Ti) can be produced by the reaction of metallic sodium (Na) with titanium tetrachloride vapor (TiCl4). The byproduct
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help plz
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Which procedure can be used to demonstrate that matter is conserved during a chemical change or a reaction one point
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Flammable materials
(1.point) Catch fire easily and burn easily
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Keyzia Boone
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The chemical reaction that produces soap is called saponification. During one type of saponification, oil and sodium hydroxide
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Anonymous
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Hydrogen gas can be produced by the reaction of magnesium metal with hydrochloric acid by the reaction below.
Mg + 2HCl → MgCl2
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Sodium reacts with chlorine to form the compound sodium chloride, or salt. If 1 point the total mass of the reactants is 58.44
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When they say "carbon is found in many pools", what do they mean by pool?
a place carbon is rarely found. a natural collection
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Use the table to answer the question.
Sample Observation 1 The drop of food coloring spreads slowly. 2 The drop of food coloring
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If more sugar is placed into a glass of iced tea then can dissolve in the tea the additional sugar will sink to the bottom of
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Which statement best explains why magnesium and chlorine combine in a 1:2 ratio?(1 point)
Responses Chlorine’s atomic number is
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In what type of bonds do atoms join together because their opposite charges attract each other?(1 point) Responses metallic
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Matter and Energy Unit Test
5 of 145 of 14 Items Question One molecule of glucose is recycled into ___ molecules of carbon
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blue follower
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choose the 3 correct statements. explain
a There are 6 total bonds formed in the compound. b There are 5 total bonds formed in
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A company dissolves 'X' amount of CO2 at 298 K in 1 litre of water to prepare soda water
X =____ × 10–3g. (nearest integer)
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nothin
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Proteins, nucleic acids, lipids, and carbohydrates are based on which molecule?(1 point)
Responses oxygen oxygen hydrogen
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Take the brick off the burner. Replace it with the iron. Drag a thermometer and attach it to the iron. Add heat to the iron.
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A student compiled data in a table to compare pure substances and mixtures.
Which statement BEST describes the mistake the
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not.bta.eli
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Which industry led to the development of the Houston Ship Channel?(1 point)
Responses aerospace aerospace computer computer
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Alto Saxaphone
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In the video, what evidence is there that there was more bond energy when the products were formed?(2
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Marjorie is conducting a science experiment to measure the amount of pollution produced by car that used gasoline containing
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Which value (if any) in each pair corresponds to a faster reaction? Select the single best answer for each part.
Part 1 of 3 Ea =
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Calculate the volume of Co2 that would be produced from 0.5 mole of Fe2O3 according to the following equation
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Noble Mike Ighodalo
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A student wants to draw a model of an atom. Which statement describes how to find the number of neutrons to include in the
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A sample with a mass of 3.698 g consists of 64.93% tin and 35.07% sulfur. What is the molar ratio of sulfur to tin in the
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What is ALL matter made of?
* 1 point cells atoms molecules compounds
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@~@
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A student attempts to arrange four elements (as shown below) in order from most reactive to least reactive. Is the arrangement
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hi :)
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Which statement about an atom is correct?(1 point)
Responses The neutron has no charge and is found outside of the nucleus. The
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Use the table of molar masses to complete the question. Do NOT use any other values except the ones provided in the table below.
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How many neutrons are in the atom shown below? (1 point) Responses 82 82 55.845 55.845 30 30 26
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if hydrogen is the most common element on earth, what makes generating hydrogen expensive and polluting? What is a possible
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Elizabeth was studying physical and chemical properties and created the table below to help her. Which property and example does
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Which statement about an atom is correct?(1 point)
Responses The electron has a negative charge and is found outside of the
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Elements A and B react according to the following equation. 4A + B2 →2A2B The molar mass of A is 12 g/mol. The molar mass of B
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Matter Unit Test 12 of 1612 of 16 Items Question Which of the following describes a positive correlation? (1 point) Responses As
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During chemical reactions, bonds between atoms break and form. What does this mean in terms of subatomic particles?(1 point)
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.
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Classify each of the following substances as a colloid, heterogeneous mixture, homogeneous mixture, solution, or suspension.
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A scientist burns a newspaper completely to ash. How does the newspaper’s initial mass compare to the total mass of the ashes
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Question A student combines two liquids in a beaker. She observes that the mass of the combined liquid is less than the mass of
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2 of 102 of 10 Items
Question How many neutrons are in the atom shown below? (1 point) Responses 55.845 55.845 26 26 30 30 82 82
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Two friends are discussing physical and chemical changes. Isabela says that when you eat, it is a physical change because when
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The rate of a reaction is the speed in which reactants are converted into products. Which scenarios below would increase the
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“Green” material has high amounts of (1 point) Responses magnesium. magnesium. carbon. carbon. nitrogen. nitrogen.
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which option describes a common production use of aluminule
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Substances A and B react in a ratio of A + B → AB. Colin was combining substance A and substance B to form substance AB. He
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me
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3 of 43 of 4 Items
Question Use the equation and the table to answer the question. FeCl3 + 3H2O → Fe(OH)3 + 3HCl Element Mass
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Demon
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You are given the melting point and boiling point of an unknown substance. You are to create a heating curve from the data
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LostCoward
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Which observation most likely indicates that only a chemical change has taken place?
A. The change cannot be reversed. B. The
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Why do you have a certain number of reactants on the left side? Use the example below to support your answer.
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Disiirl
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can you help me with this Calculate the value of [OH" ] from the given | H3O+ | in each solution and label the solution as
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