Chemistry

Rocks formed by changes in heat and pressure or the presence of hot, watery fluids

Karen Wright

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Which statement correctly explains the polarity of the water molecule? A. The hydrogen end of the molecule has a partial negative charge and the oxygen end has a partial positive charge. B. The oxygen end of the molecule has a partial negative charge and the hydrogen end has a partial positive charge. C. Both ends of the molecule have a partial negative charge, which attracts the other water molecule towards itself.

Ashley Howard

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Which of the following statements describes a scientific law? a. A scientific law explains a set of events. b. A scientific law describes what occurs every time in a situation. c. A scientific law is constantly modified. d. A scientific law is developed without experimentation.

Mindee Nelson

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Which is the first step in the dissolving process? A.) The solute becomes like the solvent. B.) The solute molecules are carried into the solution. C.) The solvent molecules surround the solute particles. D.) The solvent molecules are attracted to particles at the surface of the solute.

Samantha Barber

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The amount of heat involved in the synthesis of 1 mole of a compound from its elements with all substances in their standard states at 25 degrees celcius is called

Nicholas Rivera

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A barium atom attains a stable electron configuration when it bonds with...

Theresa Perry

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The Bessemer process created strong, lightweight (1 point) steel. oil. iron. coal.

Ronald Miller

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If people have trouble digesting fats, they most likely have trouble with __________. a. the esophagus and liver b. the pancreas and stomach c. the liver and gallbladder d. the small intestine and large intestine

Caroline Campbell

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In a nuclear reaction, mass must be lost to produce energy. Please select the best answer from the choices provided T F

Melissa Norris

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

Dana Keller

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H2, N2, O2 molecules. . . A)must be polar. must be nonpolar. . B)can be polar or nonpolar depending on geometric . C)configuration. . D)indeterminate

Ross Pratt

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Unlike a prokaryotic bacteria cell, a virus, like the one in the image, A) has a lipid cell wall. B) has no genetic material. C) cannot reproduce on its own. Eliminate D) does not contain any organic molecules.

Ross Pratt

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Draw the cis and trans isomers of 2-butene, ch3chchch3. show all hydrogen atoms.

Dana Keller

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A certain ionic compound is made entirely of aluminum and oxygen. part a what is the formula for this compound?

Caroline Campbell

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Methanol (CH3OH) has a heat of fusion of 3.16 kJ/mol. Which of the following is the heat of solidification that occurs when 63 grams of liquid methanol freezes?

Rodney Fox

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What are the weakest attractions between molecules? a. ionic forces c. covalent forces b. Van der Waals forces d. hydrogen forces

Jennifer Patterson

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A sample of 76 g of NaCl is dissolved to make 1 L of solution. What is the molarity of the solution? Show your work.

Nicholas Rivera

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Moseley's changes to the periodic table were based mainly on what part of the scientific process? observation of the elements<--- my answer, correct? argumentation among scientists existing knowledge about mass competition among scientists

Ashley Howard

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1. Which of the following can take the shape of the container it is in but has a fixed volume?. . A. argon gas. B. liquid bromine. C. solid water. D. hydrogen plasma. 2 . In which of these samples do the molecules have the greatest kinetic energy? A. solid ice (-25 °C). B. water vapor (102°C). C. ice water (0°C). D. liquid water (54°C).

Ramon Kelly

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Which reaction will produce a solution that does not conduct electricity? A. CH3OH(l) CH3OH(aq) B. CaBr2(s) Ca2+(aq) + 2Br(aq) C. HF(g) + H2O(l) H3O+(aq) + F–(aq) D. NH3(g) + H2O(l) NH4+(aq) + OH–(aq)

Eric Morgan

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Water can be heated above its boiling point without boiling. what is this process called?

Jeffrey Rodriguez

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Which statement is true about radiocarbon dating? After it dies, an organism’s body continues to intake C-14. Radiocarbon dating is useful for dating objects up to 100,000 years old. Radiocarbon dating assumes that half-life for radioisotopes change over time. The half-life of C-14 is 5,730 years.

Zach Chandler

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Which best describes what forms in nuclear fission? A. two smaller, more stable nuclei B. two larger, less stable nuclei C. one smaller, less stable nucleus D. one larger, more stable nucleus

Alexa Spicer

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Calculate the nuclear binding energy for 5525mn in megaelectronvolts per nucleon (mev/nucleon).

Craig Stewart

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The windchill index tells you A. the temperature of the water during winter. B. the amount of moisture in the air. C. how wind and temperature affect your body in winter. D. how wind speed affects heating needs for structures

James Washington

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Which quantity of heat is equal to 200. joules? (1) 20.0 kJ (3) 0.200 kJ (2) 2.00 kJ (4) 0.0200 kJ

Rodney Fox

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Calculate the frequency of the n = 6 line in the Lyman series of hydrogen.

Kristi Hammond

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Which of the following is true about isopropyl alcohol? It is insoluble in water. It is completely odorless. It has a relatively high boiling point. It is white.

Ronald Miller

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Which option describes a similarity and a difference between isotopes of an element? A) same atomic number; different number of protons B) same number of protons; different atomic number C) same atomic number; different mass number D) same mass number; different atomic number E) same number of neutrons; same number of protons

Caroline Campbell

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Classify each solid as a covalent, ionic, metallic, or molecular solid. Drag the appropriate items to their respective bins. HelpReset frozen ethanol calcium fluoride rhombic sulfur pure calcium

Nicholas Rivera

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The (triangle)Hrxn of formation of carbon dioxide is negative. Which statement is true? The reaction is endothermic. The reaction is exothermic. The amount of carbon dioxide is more than the amount of reactants. The amount of carbon dioxide is less than the amount of reactants.

Zach Chandler

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Which of these liquids has the highest viscosity? A. Syrup B. Water C. Orange juice D. Milk

Caroline Campbell

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The hydrogen ions released by the dissociation of carbonic acid are buffered by their ________.

Annie Barnes

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What does the name 2–butene tell you about this hydrocarbon's molecular structure? A.There are two carbon atoms and all single carbon bonds. B. There are two carbon atoms and a double carbon bond. C. There are three carbon atoms and a double carbon bond that starts on the second carbon atom. D. There are four carbon atoms and a double carbon bond that starts on the second carbon atom.

Melissa Norris

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What is a base used in toothpaste? sorbitol carrageenan magnesium hydroxide sodium lauryl sulfate

Kyle Mckinney

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What causes the difference in bond angles in carbon dioxide and water? A) the distance between the atomsin either molecules B) the facr that there are tei oxygen atoms in carbon dioxide and only one in water C) the fact that the number of lone pairs of electrons on the central atom is greater in the case of water D) the presence of a carbon atom in carbon dioxide E) the presence of a hydrogen atom in water

Kevin Sutter

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What information can you get from a station model?

Samantha Barber

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What is typically displayed on the y-axis of a solubility curve?

Deborah Edwards

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How many structures are possible for a octahedral molecule with a formula of ax4y2?

Jessie Thompson

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Which of the following is not an example of a polymer? Select one: a. Polystyrene b. Nylon c. Sucrose d. PVC

Ronald Miller

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Consider the following balanced reaction between hydrogen and nitrogen to form ammonia: 3H2(g) + N2(g)→2NH3(g) How many moles of NH3 can be produced from 24.0 mol of H2 and excess N2?

Karen Wright

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PLEASE HELP I WILL GIVE YOU 50 POINTS Which of the following aqueous solutions will have the lowest vapor pressure at 25°C? 1.5 M C6H12O6 1.5 M LiNO3 1.0 M Al2O3 1.0 M CaF2

Rodney Fox

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Which radioisotope is used as a tracer in nuclear scanning? carbon -14 uranium-238 technetium-99m iodine-129

Jennifer Patterson

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Which is most likely why many scientists reject the cold fusion theory? There is too much waste involved in the process. Cold fusion experiments have been conducted at room temperature only. The process does not produce enough energy to meet the needs of modern humans. The original results have not been replicated consistently and reliably.

Kristi Hammond

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A sample of n2o gas has a density of 2.85 g>l at 298 k. what is the pressure of the gas (in mmhg)?

Kevin Sutter

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(a) How much negative charge is on each oxygen of the carbonate ion?

Kyle Mckinney

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Which statement defines calorimeter? a device that measures the heat that is gained or lost in a chemical change a device that measures the potential energy of an element a device that is used to measure heat capacity a device that is used to measure temperature

Ashley Howard

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The initiator trna attaches at the ribosome's _____ site.

Theresa Perry

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Make the following conversion. 60.2 mg = _____ g

Eric Morgan

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What is the net ionic equation of the reaction of BeCl2 with NaOH? Express your answer as a chemical equation. I have an answer, but everytime I enter it it says invalid format.. :/

Timothy Norman

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