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Questions in chemistry
📝 Answered - Which list includes three types of chemical formulas for organic compounds? A. covalent, metallic, isotopic B. covalent, metallic, molecular C. empirical, structural, isotopic D. empirical, structural, molecular
📝 Answered - Which term is defined as a measure of the disorder of a system? A. Heat B. Kinetic energy C. Entropy D. Activation energy
📝 Answered - What happens when you touch cold ice with your warm hand? A. Heat only transfers from the ice to your hand. B. Heat only transfers from your hand to the ice. C. Heat transfers from the ice to your hand and from your hand to the ice. D. Heat does not transfer between the ice and your hand.
📝 Answered - What is true about the element francium (Fr, atomic number 87)? More than one can be true. A. It has seven valence electrons. B. It is likely to form ionic bonds. C. It is in Period 7. D. It is a nonmetal. E. It is a metal.
📝 Answered - A chemist mixes two liquids together, and the reaction produces a gas and a solid. According to the law of conservation of mass, what should the chemist observe when she compares the total masses of the substances before and after the reaction? A. The masses are equal. B. The masses are inconsistent. C. The mass of the substances before the reaction is greater than the mass of the substances after the reaction. D. The mass of the substances before the reaction is less than the mass of the substances after the reaction.
📝 Answered - How are distant regions of the universe similar to space near Earth?
📝 Answered - What moves in or out of a substance during a change of state?
📝 Answered - Which of the following is a pure substance? A. soda B. gun powder C. sugar water D. steam
📝 Answered - Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI
📝 Answered - Which of the following is a homogeneous mixture? A. sugar dissolved in water B. oxygen and nitrogen gases in the air C. oil and vinegar salad dressing D. a silver mercury amalgam used to fill a tooth cavity
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