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Questions in chemistry

[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

[Answered] How many moles of \(\text{Ca(OH)}_2\) are in 25 mL of a 1.5 M solution?

[Answered] A(n) ____________ is a substance in which all the exact combinations of elements are always the same. A. synthetic element B. compound C. mixture D. solution

[Answered] 14. How do scientists know that the universe is expanding? A. The galaxies are moving away from each other, and the temperatures are decreasing. B. The galaxies are moving away from each other, and the temperatures are increasing. C. The galaxies are moving toward each other, and the temperatures are increasing. D. The galaxies are moving toward each other, and the temperatures are decreasing.

[Answered] What was Henri Becquerel studying when he accidentally discovered radioactivity?