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Questions in chemistry
📝 Answered - Choose from the following descriptions for solid HCl(s): A. Composed of macromolecules held together by strong bonds B. Composed of atoms held together by delocalized electrons C. Composed of positive and negative ions held together by electrostatic attractions D. Composed of molecules held together by intermolecular dipole-dipole interactions E. Composed of molecules held together by intermolecular London forces
📝 Answered - How many moles of \(\text{NO}_3\) are there in 6.2 g?
📝 Answered - Which two of these are chemical reactions? Tick two boxes. - You dissolve a spoonful of sugar in water. - Bread goes brown in the toaster. - You take an ice lolly out of the freezer and it starts to melt. - Frost forms on the grass on a cold night. - You strike a match to light a Bunsen burner.
📝 Answered - You can put out a chip pan fire by putting a damp cloth over the pan. Explain why this works.
📝 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
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