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Questions in chemistry

[Answered] Fires in forests can sometimes be stopped by cutting down trees to make a gap (called a "fire break"). Which part of the fire triangle does this remove?

[Answered] When a sample of a gas is heated in a sealed, rigid container from 200 K to 400 K, the pressure exerted by the gas is: 1. decreased by a factor of 2 2. increased by a factor of 2 3. decreased by a factor of 200 4. increased by a factor of 200

[Answered] The energy required to completely separate the ions from a solid is: A. free energy B. lattice energy C. kinetic energy D. activation energy E. ionization energy

[Answered] When lithium reacts with bromine to form the compound LiBr, each lithium atom: (1) Gains one electron and becomes a negatively charged ion (2) Gains three electrons and becomes a negatively charged ion (3) Loses one electron and becomes a positively charged ion (4) Loses three electrons and becomes a positively charged ion

[Answered] Which condensed structural formula represents an unsaturated compound? A. CH₃CH=CHCH₃ B. CH₃CH₂CH₃ C. CH₃CH₃ D. CH₄

[Answered] A sample of chlorine gas is at 300 K and 1.00 atmosphere. At which temperature and pressure would the sample behave more like an ideal gas? 1. 0 K and 1.00 atm 2. 150 K and 0.50 atm 3. 273 K and 1.00 atm 4. 600 K and 0.50 atm

[Answered] A beaker with water and the surrounding air are all at 24°C. After ice cubes are placed in the water, heat is transferred from: 1. the ice cubes to the air 2. the beaker to the air 3. the water to the ice cubes 4. the water to the beaker

[Answered] Which mixture will not yield hydrogen gas? A. Sodium and water B. Calcium and water C. Zinc and hydrochloric acid D. Zinc and concentrated nitric acid E. Steam and red hot iron

[Answered] A substance releases heat when it changes from: a. liquid to solid b. solid to gas c. liquid to gas d. solid to liquid

[Answered] Which element reacts spontaneously with 1.0 M HCl(aq) at room temperature? 1. Copper 2. Gold 3. Silver 4. Zinc