This question is about reactions of metals. Figure 1shows what happens when calcium, copper, magnesium and zinc are added to hydrochloric acid. Figure 101.1What is the order of decreasing reactivity of these four metals?[1 mark]Tick()onebox. Zn Ca Cu MgCa Cu Mg ZnCu Zn Ca MgCa Mg Zn Cu

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Areaction in which products can react to re-form reactants is