leadrebel - Smart Answers. Smarter Community. Logo

Questions in chemistry

📝 Answered - What is the name given to the property of metal that allows electricity to pass through?

📝 Answered - A company is designing a new range of saucepans. The base of the saucepan should conduct heat well and evenly, while the handle should be a good insulator. Which one of the following lists of substances would be the most appropriate for these tasks? Base | Handle ---|--- (a) aluminium | aluminium (b) copper | plastic (c) glass | glass (d) plastic | copper

📝 Answered - A typical neon light contains neon gas mixed with argon gas. If the total pressure of the mixture is 1.63 atm and the partial pressure of the neon is 0.71 atm, what is the partial pressure (in atm) of argon?

📝 Answered - A pure substance is found to be a good conductor of electricity in both its solid and liquid phases. The bonding in the substance is which one of the following? (a) ionic (b) covalent molecular (c) metallic (d) covalent network

📝 Answered - An athlete with a high count of red blood cells will perform well in tests of physical endurance because (a) waste products will be removed from the body easily. (b) excess levels of glucose will increase levels of respiration. (c) the reduced plasma volume will lower carbon dioxide levels. (d) high levels of oxygen will be available to the muscles.

📝 Answered - A metal with a mass of 44 grams is dropped into 118.2 cm\(^3\) of water and sinks to the bottom. The volume of the water and object is 124.3 cm\(^3\). What is the density of the metal?

📝 Answered - An antacid tablet containing 0.50 g of NaHCO3 is dissolved in 250 mL of water. What is the molar concentration of NaHCO3 in the solution?

📝 Answered - Which physical state of matter exhibits the greatest change in volume with changes in temperature or pressure?

📝 Answered - A hydrogen-filled balloon was ignited, and 1.60 g of hydrogen reacted with 12.8 g of oxygen. How many grams of water vapor were formed? (Assume that water vapor is the only product.)

📝 Answered - Scientists use the Celsius scale as the SI unit of temperature. True or False