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Chemistry

A nucleotide is composed of a(n) _____. phosphate group, a nitrogen-containing base, and a five-carbon sugar amino group, a nitrogen-containing base, and a five-carbon sugar sulfhydryl group, a nitrogen-containing base, and a five-carbon sugar glycerol, a nitrogen-containing base, and a five-carbon sugar phosphate group, a nitrogen-containing base, and a hydrocarbon

Eric Morgan

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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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What is the arrangement of the outer planets? What effect does their placement have on the planets?

Karen Wright

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The atom with the same number of neutrons as 12c is

Samantha Barber

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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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Which of the following pairs share the same empirical formula? CH4 and C2H4 PbCl2 and PbCl4<----- my answer, correct? NO2 and N2O4 C2H6 and CH4

Tara Andrews

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The symbol for a radioactive nuclide is mc027-1.jpg. Which statement is correct? The atomic number of the radioactive nuclide is 90. The mass number of the radioactive nuclide is 144. The number of neutrons that are present in the nucleus of each atom is 324. The number of protons that are present in the nucleus of each atom is 234.

Kristi Hammond

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Which of the following compounds is a structural isomer of butane? a. 2-methylbutane c. 2-methylpropane b. 2,2-dimethylbutane d. 2,2-diethylpropane

Blair Lewis

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The ______ parts of organisms are most likely to become fossils.

Jeffrey Rodriguez

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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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Which of the following is a property of sodium hydroxide? feels slippery. releases H3O+ in an aqueous solution. turns litmus paper red. reacts with Mg to produce H2 gas. tastes sour.

Kathy Robinson

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Which is a correct set of values of m for one of the subshells of n = 2? –1, 0, 1 –1, –2, 0, 1, 2 –1, –2, –3, 0, 1, 2, 3 –1, –2, –3, –4, 0, 1, 2, 3, 4

Brandon Scott

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According to the law of conservation of energy, what will most likely happen in a closed system? Energy will be exchanged along with matter. Energy will be exchanged, but matter will not be exchanged. Energy will be created along with matter. Energy will be destroyed, but matter will not be destroyed.

Donald Ward

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Rank these gas samples according to pressure

Blair Lewis

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Conductivity in a metal results from the metal atoms having(1) high electronegativity(2) high ionization energy(3) highly mobile protons in the nucleus(4) highly mobile electrons in the valence shell

Tara Andrews

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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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Which statement best describes an antacid?

Rodney Fox

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The process of water vapor changing to a liquid is called ____. a. evaporation c. condensation b. precipitation d. convection

Ashley Howard

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For the reaction below, the equilibrium concentrations were found to be [nh3] = 0.250 m ; [h2] = 0.420 m ; [n2] = 0.800 m . give the equilibrium constant expression and use it to calculate the constant. 2 nh3(g) 3 h2(g) + n2(g)

Ross Pratt

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What would be the formula for an alkane which contained 42 hydrogen atoms? C____H42 20 21 22 23

Victoria Fowler

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Which of the following statements is not true of the combustion of an organic compound? A. oxygen gas (O2) must be one of the reactants B. energy is released by the reaction C. it can also be described as a synthesis reaction D. carbon dioxide (CO2) will be produced

Jennifer Patterson

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Which statement describes a chemical property of silicon? A) Silicon has a blue-gray color. B) Silicon is a brittle solid at 20.°C. C) Silicon melts at 1414°C. D) Silicon reacts with fluorine.

Theresa Perry

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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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Which of the following statements is correct with respect to electron spin?

Ross Pratt

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In which level of the atmosphere is Ozone concentrated? A. TroposphereB. Stratosphere C. MesophereD. Thermosphere

Jennifer Patterson

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Which molecule has polar bonding and is nonpolar? 1) H2O 2) BF3 3) NH3 4) NCl3 5)CH2Cl2

Jodi Brooks

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A BAL of .055 can reduce the field of vision by __________.

Kathy Robinson

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Complete and balance each equation. If no reaction occurs write N/R. NaOH(aq) + FeBr3(aq)

Daniel King

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Which formula represents propyne? (1) C3H4 (3) C5H8 (2) C3H6 (4) C5H10

Rodney Fox

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What is the molar mass of fluorine, F2? Is it 19mol or 38mol?? Please Help.

Jennifer Patterson

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Which best explains why blood is considered to be a suspension? A)It has nutrients that cannot be dissolved b)It contains particles that can settle out. C)It has nutrients that are dissolved in its liquid portion. D)It contains particles that mix on a molecular level.

Karen Wright

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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 of the following materials is a substance. air gasoline stainless steel or silver

Justin Parker

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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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Which compounds are classified as electrolytes? (1) KNO3 and H2SO4 (2) KNO3 and CH3OH (3) CH3OCH3 and H2SO4 (4) CH3OCH3 and CH3OH

Samantha Barber

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

Theresa Perry

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Which property of water makes it helpful to use in car radiators? A) Water can climb up the sides of a tube. B) Water is a universal solvent. C) Water takes long to heat and cool down than other liquids.

Victoria Fowler

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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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Which of the following can be used to neutralize an ammonia (NH3) solution?

Victoria Fowler

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Which statement correctly defines dynamic equilibrium? At dynamic equilibrium, the rates of forward and reverse reactions are equal. At dynamic equilibrium, the rate of the forward reaction is higher than the rate of the reverse reaction. At dynamic equilibrium, the forward and reverse reactions stop. At dynamic equilibrium, the concentrations of reactants and products are equal.

Caroline Campbell

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WHAT TRANSPORT ULTRAVIOLET DYE THROUGH THE A/C SYSTEM?

Jeremy Wood

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I WILL MARK BRAINLIEST!!!! Which of the following best describes used nuclear fuel rods? a.Used nuclear fuel rods are not radioactive. b.Used nuclear fuel rods are useful for industry. c.Used nuclear fuel rods remain radioactive for one year. d.Used nuclear fuel rods are stored under very strict conditions.

Dana Keller

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Materials of low mass are combined to form a substance of higher mass during ____. a. fission c. both A and B b. fusion d. neither A nor B

Kristi Hammond

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The focus of the earthquake is the: A. place that sustains the most damage B. point of failure of crustal rocks where the waves originate. C. location in which the earthquake was first felt D. place where the P-wave ends.

Cynthia Baker

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Which factor causes water to form small drops on a waxy surface? van der Waals forces hydrogen bonding London dispersion forces ionic bonding

Caroline Campbell

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Which of the following is not the same as 2.97 milligrams? A)0.297 cg B)0.00297 g C) 0.0000297 KG

Carlton Burgess

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