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Questions in chemistry
📝 Answered - What is an important science lab safety guideline to remember? Select ALL that apply. A. Clean and return all equipment you used. B. Read all instructions carefully. C. Act responsibly at all times. D. Eat and drink while working in the lab.
📝 Answered - Why will the color of a compressed gas cylinder not tell you anything about the gas inside it? A. Cylinder colors are not standardized. B. Cylinder colors are chosen by the companies that own the cylinders. C. Each cylinder owner may use a different "color-coding" system. D. Both B and C are correct. E. All of the above are correct.
📝 Answered - Empty Space between Particles Aristotle's idea of the continuity of matter implies that all space is filled with matter and that there is no such thing as empty space. This idea is contradicted by the principle of the particle nature of matter, which states that empty space exists between particles of matter. Let us verify this idea by doing Mini Lab 2-1. MINI LAB 2-1 Materials: brown sugar, water, drinking glass, and teaspoon Procedure: 1. Fill the glass halfway with water. 2. Add one-half teaspoon of sugar to the water and stir until it is completely dissolved. Guide Questions: 1. What happened to the sugar and water particles in the solution? What do you think their particle arrangement looks like in the solution? 2. How will you explain your observations in terms of the idea that particles of matter have spaces between them?
📝 Answered - Which best describes solubility? A. the speed at which a substance dissolves B. the ability of one substance to dissolve in another C. the amount of surface area per a given mass D. the temperature at which substances become a mixture
📝 Answered - Which statement correctly compares the pH of water to that of other substances? A. The pH of water increases as its temperature increases, while other substances have a stable pH. B. The pH of water is neutral; it is higher than the pH of acids and lower than the pH of bases. C. Water contains more hydrogen ions than most other substances, giving it a higher pH. D. Water is neutral and has a pH of 0; acids have a pH greater than 0, and bases have a pH less than 0.
📝 Answered - Which of the following factors will slow down the rate of reaction? A. Use as an enzyme B. Increased surface area C. Volume reduction D. Decreased temperature
📝 Answered - Which element is classified as a noble gas? A. N B. Cl C. Xe
📝 Answered - How would one convert 125 lb to kilograms $(1 oz =28 g)$? A. $125 lb \times \frac{16 oz }{1 lb } \times \frac{28 g}{1 oz } \times \frac{1 kg}{1000 g}$ B. $125 lb \times \frac{28 g}{1 oz }$ C. $125 lb \times \frac{16 oz }{1 lb } \times \frac{28 g}{1 oz }$ D. $125 lb \times \frac{28 g}{1 oz } \times \frac{1 kg}{1000 g}$
📝 Answered - Using the information in the table, calculate the average atomic mass of strontium. Report to two decimal places. [tex] \square [/tex] amu | Strontium | |---|---|---| | Isotope | Mass (amu) | Abundance | | Sr-84 | 83.913428 | 0.56% | | Sr-86 | 85.909273 | 9.86% | | Sr-87 | 86.908902 | 7.00% | | Sr-88 | 87.905625 | 82.58%
📝 Answered - Select the best answer for the question. 20. On Earth, where is hydrogen not found? A. Water B. Natural gas well C. Atmosphere D. Mine
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