Chemistry Questions

Which formula represents a molecular compound?(1) Kr (3) N2O4(2) LiOH (4) NaI
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At STP, 1.0 liter of helium contains the same total number of atoms as(1) 1.0 L of Ne (3) 0.5 L of Rn(2) 2.0 L of Kr (4) 1.5 L of Ar
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Compared to a 26-gram sample of NaCl(s) at STP, a 52-gram sample of NaCl(s) at STP has(1) a different density(2) a different gram-formula mass(3) the same chemical properties(4) the same volume
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Given the balanced equation:2KClO3==> 2KCl + 3O2Which type of reaction is represented by this equation?(1) synthesis(2) decomposition(3) single replacement(4) double replacement
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Compared to pure water, an aqueous solution of calcium chloride has a(1) higher boiling point and higher freezing point(2) higher boiling point and lower freezing point(3) lower boiling point and higher freezing point(4) lower boiling point and lower freezing point
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Which aqueous solution of KI freezes at the lowest temperature?(1) 1 mol of KI in 500. g of water(2) 2 mol of KI in 500. g of water(3) 1 mol of KI in 1000. g of water(4) 2 mol of KI in 1000. g of water
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As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element(1) decreases(2) increases(3) remains the same
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What occurs when NaCl(s) is added to water?(1) The boiling point of the solution increases, and the freezing pointof the solution decreases.(2) The boiling point of the solution increases, and the freezing pointof the solution increases.(3) The boiling point of the solution decreases, and the freezing pointof the solution decreases.(4) The boiling point of the solution decreases, and the freezing pointof the solution increases.
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Which type of reaction releases the greatest amount of energy per mole of reactant?(1) combustion (2) decomposition (3) nuclear fusion (4) oxidation-reduction
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Based on your own understanding and information in this lesson, what characteristics of the Confederate States of America made it a confederal government when compared to the government of the United States?
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If you make an electromagnet using a battery circuit and a steel nail, how can you increase its magnetic strength? A. replace the nail with a copper rod B. wrap more coils of wire around the nail C. use a longer nail D. remove the plastic insulation from the wire coil
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How many moles of water will be generated during the combustion of 0.38 moles of methyl alcohol (CH3OH)? 2CH3OH + 3O2 2CO2 + 4H2O
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]Astrology is a pseudoscience because
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The _______ is the total number of organisms that an ecosystem can support.a. tolerance rangeb. carrying capacityc. competitive exclusion principled. population
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Which pure substance can be classified as an element? -H2-NO3-NaCl-H2SO4
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Approximately how long has the Moon been geologically inactive?A. 1 billion yearsB. 3 billion yearsC. 4 billion yearsD. 4.5 billion years
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juan is planning an investigation about natural reserves. which of these is most likely to be a reliable source of scientific information on the internet
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Calcium chloride contains only calcium and chloride. What is the formula for this compound
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