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Chemistry

Which one is the best description of a chemical reaction? A.) mixing two substances B.) the combustion of a substance C.) forming or breaking bonds D.) the decomposition of particles

Annie Barnes

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Which represents the empirical formula for a3B9

Justin Parker

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Given that hclo4 is a strong acid, how would you classify the basicity of clo−4?

Samantha Barber

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Which best characterizes a crystal?

Zach Chandler

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In which tool are uranium atoms split to make electricity?

Justin Parker

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What is one benefit associated with a nuclear fission reaction? (1) The products are not radioactive. (2) Stable isotopes are used as reactants. (3) There is no chance of biological exposure. (4) A large amount of energy is produced.

Jennifer Patterson

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Which best describes emerging scientific ideas?

Ross Pratt

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A toy boat is floating in a large metal bucket. If you build a fire under the bucket, how the heat will transfer from the fire to the boat? A. Water molecules in the bucket will transfer the heat. B. Metal molecules of the bucket will transfer the heat. C. Surrounding air molecules will transfer the heat.

Deborah Edwards

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Which of the following is not a base? A: NH3 B. NaOH C. H3C6H5O7 D. KOH

Caroline Campbell

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Which of the following is not a common hydrate a epsom salt b borax c sugar d alum i belive the answer is sugar

Mindee Nelson

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What are the two causes of density in deep current waters? a. Salinity (how much salt) of the water and high temperatures c. Oxygen content of the water and high temperatures . b. Salinity (how much salt) of the water and low temperatures d. Oxygen content of the water and low temperatures

Nicholas Rivera

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Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their (1) atomic numbers (2) crystal structures (3) isotopic abundances (4) percent compositions

Ronald Miller

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Precision can be defined as the exact center of a data set. reproducibility of a measured value. correlation between two variables that are measured in a data set. agreement between a measured value and an accepted value.

Blair Lewis

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Which of the following reactions results in a decrease in entropy? (2 points) Question 17 options: 1) 6CO2 (g) + 6H2O (l) yields C6H12O6 (s) + 6O2 (g) 2) 2NH3 (g) yields N2 (g) + 3H2 (g) 3) N2O4 (g) yields 2NO2 (g) 4) 2H2O2 (aq) yields 2H2O (l) + O2 (g)

Victoria Fowler

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Which is a characteristic of a homogeneous mixture that is a liquid? It exhibits the Tyndall effect. Brownian motion is not visible in it. It cannot be separated using filtration. It has at least two phases.

Timothy Norman

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Quota sampling is mostly based on participant availability or volunteers.

Roger Moore

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When the pH of a solution is changed from 4 to 3, the hydronium ion concentration of the solution: (1) decreases by a factor of 10 (2) increases by a factor of 10 (3) decreases by a factor of 100 (4) increases by a factor of 100 and why?

Cynthia Baker

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Iron reacts with oxygen to form iron oxide (rust). Whichof the statements below best describes this statement? A. Iron oxide is the liquid state of iron. B. Iron oxide is the gaseous state of iron. C. Iron oxide is formed by rearranging atoms. D. Iron oxide is made up of only iron atoms.

Donald Ward

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Methane reacts with oxygen to produce carbon dioxide and water,What are the products? A. methane and water. B. oxygen and carbon dioxide. C. methane and oxygen. D. carbon dioxide and water.

Caroline Campbell

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Which career is most concerned with the study of radioactive isotopes? biochemist nuclear chemist organic chemist nuclear engineer

Kristi Hammond

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Which of the following would be the least reliable source of scientific information? newspaper scientific journal government internet site science textbook

Justin Parker

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Calcium phosphorus magnesium and fluoride mainly serve as structural components of

Jennifer Patterson

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Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars every day. although the actual process also requires water, a simplified equation (with rust shown as fe2o3) is: 4 fe(s) + 3 o2(g) → 2 fe2o3(s) δhrxn = −1.65 × 103 kj (a) what is the δhrxn when 0.250 kg of iron rusts?

Melissa Norris

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Which reaction below represents the electron affinity of li? which reaction below represents the electron affinity of li? li(g) + e- → li-(g) li(g) + e- → li+(g) li+(g) → li(g) + e- li(g) → li+(g) + e- li+(g) + e- → li(g)?

William Cain

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What is the theoretical yield of Fe2(SO4)3 if 20.00 g of FePO4 reacts with an excess of Na2SO4?

Tara Andrews

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Which of the following would most likely act as a Bronsted-Lowry acid?

Zach Chandler

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What can be categorized as a use of plasma in technology

Amanda Johnson

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How many valence electrons are available for bonding in silicon

Bethany Evans

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Repeating units in an organic compound are called Monomers Amino acids Polymers Hydrocarbons

Nicholas Rivera

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The decomposition of n2o5 can be described by the equation given these data for the reaction at 45°c in carbon tetrachloride solution, calculate the average rate of reaction for each successive time interval. 0 155

Eric Morgan

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[07.03] what is the ph of a 6.40 × 10-3 m solution of sodium hydroxide, naoh?

Jennifer Patterson

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The diaphragm adjusts the ____________ on a light microscope.

Mindee Nelson

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The heating element of an electric dryer is rated at 4.1 kw when connected to a 240-v line.

William Cain

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Which combination is the best choice to prepare a buffer with a ph of 9.0?

Cynthia Baker

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Manual handling of materials accounts for the primary source of injury in the workplace

Kyle Mckinney

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Which of the following diatomic species are paramagnetic and which are diamagnetic? A blank molecular orbital diagram (Part B 1 figure) has been provided to help you. Drag the formulas to the appropriate magnetic bin :C2^2+,Li2-,B2^2-

Jennifer Patterson

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The molecular mass of octane is 114.22 g/mol. What is the mass of 22.05 mol of octane?

Kathy Robinson

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An emulsifying agent is typically characterized by having One polar end one nonpolar end two polar ends one polar end and one nonpolar end ------------------------------------------------------------- Also can someone please explain to me what Emulsifying means because im stuck. Thank you =D

Roger Moore

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Which statement describes the kinetic energy of a particle? A.) It is attracted to particles of the opposite charge. B.) It is much larger than particles of another substance. C.) It moves quickly after a collision with another particle.

Kathy Robinson

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What can form as a result of a chemical reaction?

Blair Lewis

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Which statement correctly describes the relationship between reactant and yield? A. The actual yield is calculated from the amount of the excess reactant present B. The actual yield is calculated from the amount of the limiting reactant present. C. The theoretical yield is calculated from the amount of the excess reactant present. D. The theoretical yield is calculated from the amount of the limiting reactant present.

Jeremy Wood

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A molecular compound is formed when a chemical reaction occurs between atoms of (1) chlorine and sodium (2) chlorine and yttrium (3) oxygen and hydrogen (4) oxygen and magnesium

Chelsea Hayes

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Which of the following is a product formed when Ag2O decomposes? Select one: a. Ag2 b. O c. O2 d. AgO

Donald Ward

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Which formula equation represents the burning of sulfur to produce sulfur dioxide

Bethany Evans

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Which one of the following solutions will have the greatest concentration of hydroxide ions 0.100 M rubidium 0.100 M magnesium hydroxide 0.100 ammonia 0.100 M beryllium hydroxide 0.100 M hydrochloric acid

Amanda Johnson

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Which statement describes how the binary ionic compound KBr is named?

William Cain

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Determine the molar solubility of agi in pure water. ksp (agi) = 8.51 × 10-17.

Ralph Lopez

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