Pls answer these questions for brainliest katya is investigating displacement reactions . She heats the pairs of substances in this list

iron and aluminium oxide
iron and copper oxide
copper and magnesium oxide
iron and lead oxide

a)write down the letters os 2 pairs of substances that react . Explain your choices

b) choose one pair of substances that react . write a word equation for the reaction

Match the acid base pairs by arranging the acid name with the conjugate base formula. hydrogen carbonate hydrogen phosphate carbonic acid read water sulfuric acid phosphoric acid a. co32- b. hso4- c. hco3- d. po43- e. h2po4- f. oh-

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?