Select all the correct answers. Regina is testing this hypothesis:
Higher relative humidity leads to faster growth in orchids.
She has designed an experiment in which she will grow orchids in terrariums of varying humidity levels. She will then observe
how the humidity affects the growth of the plants.
Which of the following variables are the confounding variables that Regina should control for before beginning her
experiment?
the amount of sunlight the plants receive
the temperature at which the plants grow
the type of soil in which the plants grow
the growth rate of each of the plants
the relative humidity inside each terrarium

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.