An electric fan heater contains a heating element and a motor that drives the fan. The circuitdiagram is shown.At first, the switch is open and the current in the motor…

Hot, concentrated aqueous sodium hydroxide and chlorine react as shown in the equation:6NaOH + 3Cl2 → 5NaCl + NaClO3 + 3H2OWhich of the following statements is/are correct?1 Chlorine has oxidation…

Scientists are using human stem cells to develop treatments for a wide variety of healthconditions.Two types of stem cell that are available for this work are: stem cells collected from…

Which one of the following is a simplification of 2-2x+1 / 4x2+4x+1 ? Answer: 4) A 2- 2x+1 / 4x2+4x+1We can simplify the denominator24x 4x + 1 = (2x +…

A supermarket has a large open-topped deep freezer to keep products frozen but still visible to customers. Which statement about the air in this freezer explains why the products remain…

A sample of an element consists of two isotopes. The relative abundance of each isotope isshown in the table.What is the relative atomic mass of the element in this sample?…

Which two of the following statements about genetic variation are correct?1 Asexual reproduction always produces genetic variation.2 Gamete production is the only possible source of genetic variation in sexual reproduction.3…