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Questions in chemistry

📝 Answered - Who was the first scientist to discover crystals?

📝 Answered - The oxygen saturation of a lake is found by dividing the amount of dissolved oxygen the lake water currently has per liter by the dissolved oxygen capacity per liter of the water, and then converting that number into a percent. If the lake currently has 7.4 milligrams of dissolved oxygen per liter of water and the dissolved oxygen capacity is 9.4 milligrams per liter, what is the oxygen saturation level of the lake, to the nearest percent?

📝 Answered - In which country was the first crystal discovered?

📝 Answered - Describe the process that ice on Mount Everest goes through when being heated from 10 degrees Fahrenheit to 305 Kelvin. Then, explain how the energy requirements change at different steps of the heating curve. What are the energy transfers that happen in the ice on Mount Everest?

📝 Answered - The type of bond between atoms in a molecule of CO2 (electronegativity difference = ~1) a. hydrogen bond b. ionic bond c. polar covalent bond d. pure covalent bond e. metallic bond

📝 Answered - Any reaction that absorbs 150 kcal of energy can be classified as: A. Activated B. Exothermic C. Oxidation D. Endothermic

📝 Answered - Write a word equation for the following reactions: 1. Hydrochloric acid + sodium hydroxide 2. Sulphuric acid + copper hydroxide 3. Nitric acid + sodium hydroxide 4. Hydrochloric acid + calcium hydroxide 5. Sulphuric acid + potassium hydroxide 6. Hydrochloric acid + lithium hydroxide 7. Nitric acid + magnesium hydroxide

📝 Answered - What is the empirical formula of a compound that is 79.8% carbon and 20.2% hydrogen?

📝 Answered - What are eight elements named after towns?

📝 Answered - In order to separate two substances by fractional crystallization, the two substances must differ in which of the following? A. Solubility B. Specific gravity C. Vapor pressure D. Viscosity E. Freezing point