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
Which of the following cannot pass across the placenta? (a) oxygen (b) waste materials (c) blood (d) nutrients
Which one of the following statements about absolute zero is correct? (a) At absolute zero, the volume of an ideal gas is zero. (b) At absolute zero, ideal gases freeze to give solids. (c) At absolute zero, solid and liquid water are at equilibrium. (d) Absolute zero is the lowest temperature so far reached in the laboratory
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?
A metal having a mass of 44 grams is dropped in 118.2 cm3 of water and sinks to the bottom. The volume of the water and object is 124.3 cm3 . What is the density of the metal?
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.
a hydrogen-filled balloon was ignited and 1.60g of hydrogen reacted with 12.8g of oxygen. how many grams of water vapor were formed? (assume that water vapor is the only product.)could you help me with this one:) ?
Which physical state of matter exhibits the greatest change in volume with changes or temperature or pressure?
In the thermal decomposition of copper carbonate, the black solid left behind weights less than the original copper carbonate . Why?
After decaying for 48 hours, l/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?
