A student is asked to measure the time taken for 0.4g of magnesium carbonate to react completely with 25.0 cm of dilute hydrochloric acid
Which pieces of apparatus does the student need?
a. balance, stop_clock, pipette
b. balance, stop_clock, thermometer
c. balance, pipette, thermometer
d. stop_clock, pipette, thermometer ​

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

is there multiple choice answers?

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

a electronegativity decreases beacuse the size of nucleus is bigger.