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Chemistry

At STP which sample contains the same amount of molecules as 3.0 liters of H2 (g)?1.5 L of NH3 (g)2.0 L of CO2 (g)3.0 L of CH4 (g)6.0 L of N2 (g)

Caroline Campbell

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What is the name of the hybrid orbitals used by sulfur in scl2?

Kristi Hammond

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Calculate the number of molecules in 9.00 moles H2S.

Justin Parker

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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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Atoms of I-131 spontaneously decay when the(1) stable nuclei emit alpha particles (2) stable nuclei emit beta particles (3) unstable nuclei emit alpha particles (4) unstable nuclei emit beta particles

Ronald Miller

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Your body's "thermostat" is called the _____. thyroid hypothalamus thalamus parathyroid

Ralph Lopez

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Which of the following is not a correct chemical equation for a double displacement reaction? (D?) 2HNO3 + Mg(OH)2 yields 2H2O + Mg(NO3)2 H3PO4 + 3NaF yields 3HF + Na3PO4 2KNO2 + BaSO4 yields K2SO4 + Ba(NO2)2 4NaBr + Co(SO3)2 yields Br2SO3 + CoNa4

Timothy Norman

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Which is a characteristic of nuclear fusion? produces radioactive waste involves the collision of two nuclei commonly used by humans as an energy source requires very little activation energy

Cynthia Baker

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Oxygen constantly diffuses from air or water into an animal's bloodstream. For this to happen, the concentration of oxygen in the blood must be (1 point). .A. -greater than the concentration of oxygen in the air or water.. B.-greater than the concentration of carbon dioxide in the air or water.. C.-lower than the concentration of oxygen in the air or water.. D.-lower than the concentration of carbon dioxide in the air or water.

Ronald Miller

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3 During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms (1) are lost by the atoms (2) are gained by the atoms (3) return to lower energy states within the atoms (4) move to higher energy states within the atoms

Eric Morgan

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I'm which of these statements are protons, electrons and neutrons correctly compared? Download png

Annie Barnes

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What are ionic compounds typically composed of? a metal anion and a nonmetal cation two metal anions a metal cation and a nonmetal anion two nonmetal cations

Heather Maxwell

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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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In the atmosphere water vapor condenses to form clouds. a. True b. False

Jennifer Patterson

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If the temperature of a piece of steel decreases, what happens to its density

Kathy Robinson

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The repeating pattern of a mineral’s particles forms a solid called a(n) a. crystal. b. element. c. compound. d. rock.

Rodney Fox

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Will the vapors of acetic acid go to the floor or ceiling of a room

Ashley Howard

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Why should carbonated beverages be kept cold? A).Decreased temperature keeps gases like carbon dioxide dissolved. B).Decreased surface area keeps gases like carbon dioxide dissolved. C).Increased agitation keeps gases like carbon dioxide dissolved. D).Decreased surface area keeps gases like carbon dioxide dissolved. E).There is no benefit to keeping the beverage cold.

Alexa Spicer

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Most plants and all animals depend on _____ to meet their need for nitrogen. lightning strikes denitrifying bacteria bacteria that break apart cellulose nitrogen-fixing bacteria

Tara Andrews

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Rank from most to least number of valence electrons. To rank items as equivalent, overlap them. Arrange the elements in decreasing order of the number of valence electrons. kr ca ba br li f as sb o al cl si na ar sr

Ashley Howard

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

Theresa Perry

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Oversteepened slopes often lead to mass movements because A. the angle of their slope is between 50 and 60 degrees. B. plants cannot grow on them. C. the angle of their slope is less than 50 degrees. D. the angle of their slope is greater than 40 degrees.

Amanda Johnson

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Identify the equivalence point on the titration curve shown here.

Blair Lewis

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How many phosphorous atoms are found in three molecules of magnesium phosphate, 3Mg3(PO4)2? 1 2 3 6

Samantha Barber

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Classify these molecules as polar or nonpolar bcl3

Jeremy Wood

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On Earth, when a body is in motion, there is always __________ to oppose the motion. a. friction c. gravity b. inertia d. acceleration

James Washington

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Which sample of matter is classified as a substance? (1) air (3) milk(2) ammonia (4) seawater

Megan Page

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A 1.0 M H2S solution has a pH = 3.75 at equilibrium. What is the value of Ka?

Jodi Brooks

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The rock record indicates that photosynthesis began on Earth about 3.5 million years ago. a. True b. False

Megan Page

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Scientific models are based on a set of observations. true or false

Kaitlin Dean

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Make the following conversion. 60.2 mg = _____ g

Eric Morgan

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What other substance containing sodium would be needed to make the buffer?

James Washington

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Which of the following will not have the same number of valence electrons? carbon silicon lead bismuth

Brandon Scott

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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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When is a roman numeral most likely needed in the name of an ionic compound? A)when more than one polyatomic ion appears B)when the anion is a polyatomic ion C)when more than one cation is used in the formula D)when the cation is a transition metal

Eric Morgan

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At which temperature is the vapor pressure of ethanol equal to 80. kPa?(1) 48°C (3) 80. °C(2) 73°C (4) 101 °C

Jeremy Wood

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Which example involves a phase change in which heat energy is released by the substance? freezing ice cream cooking a pot of soup melting ice under sunlight watching frost disappear into air

Kaitlin Dean

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Which species represents a chemical compound? (1) N2 (3) Na (2) NH4+ (4) NaHCO3

Ashley Howard

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Classify each process as an endothermic or exothermic process. drag the appropriate items to their respective bins. helpreset exothermic breaking solvent-solvent attractionsbreaking solute-solute attractions endothermic forming solute-solvent attractions

James Washington

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Which is the next logical step in balancing the given equation? CS2(l) + Cl2(g) CCl4(l) + S2Cl2(l) A.) Place the coefficient 2 in front of sulfur dichloride (S2Cl2). B.)Place the coefficient 3 in front of the chlorine molecule. C.)Leave the equation alone as it is already balanced. D.) Place the coefficient 4 in front of carbon disulfide(CS2). E.)Place the coefficient 2 in front of carbon tetrachloride(CCl4).

Whitney Matthews

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Iron reacts with oxygen in a chemical hand-warmer. How should this reaction be categorized? A. as an exothermic process because it releases heat B. as an endothermic process because it releases heat C. as an exothermic process because it absorbs heat D. as an endothermic process because it absorbs heat

Caroline Campbell

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Which is an example of a nonaqueous solution? gasoline fog mayonnaise fruit juice

Jodi Brooks

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Which is a property of both alkenes and alkynes?

Donald Ward

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Which statement best describes electrons?(1) They are positive subatomic particles and are found in the nucleus.(2) They are positive subatomic particles and are found surroundingthe nucleus.(3) They are negative subatomic particles and are found in thenucleus.(4) They are negative subatomic particles and are found surrounding the nucleus.

Ronald Miller

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Which statement defines specific heat capacity for a given sample? A. The temperature of a given sample. B. The temperature that a given sample can withstand. C. The quantity of heat that is required to raise the sample's temperature by 1 degree C (Kelvin). D. The quantity of heat that is required to raise 1 g of the sample by 1 degree C (Kelvin) at a constant pressure.

Carlton Burgess

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The elements of which group are nonreactive?

Nicholas Rivera

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In WHich sample are the particles arranged in a regular geometric pattern? A.HCI (L) B.I2 (S) C.N2 (G) D.NaCI (aq)

Blair Lewis

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Which statement best describes the formation of a solution? A large amount of solute is dissolved in a smaller amount of solvent. A small amount of solute is dissolved in a larger amount of solvent. A small amount of solvent is dissolved in a larger amount of solute. A large amount of solvent is dissolved in a larger amount of solute.

Timothy Norman

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Identify the atom whose nucleus is composed of 56 protons and 82 neutrons

Jessie Thompson

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