Question

for questions 4 - 5, refer to the following description of an experiment. (para las preguntas 5 - 7, consulte la siguiente descripción de un experimento.)
malik, ivan, and dhaymon decide to test what factors influence water absorption by an egg. they remove the shell from 3 eggs by dissolving them in vinegar. they create three different water solutions. one is pure, 100% distilled water, a second is 50% water/50% corn syrup, and the third is 100% corn syrup. the mass of each egg is measured before they are put into a single solution for 24 hours. the mass of the eggs is then measured, and the data recorded below:
(malik, ivan, y dhaymon deciden probar qué factores influyen en la absorción de agua por un huevo. quítan la cáscara a 3 huevos disolviéndolos en vinagre. crean tres soluciones de agua diferentes. una es pura, 100% agua destilada, la segunda es 50% agua/50% jarabe de maíz, y la tercera es 100% jarabe de maíz. se mide la masa de cada huevo antes de introducirlos en una única solución durante 24 horas. a continuación se mide la masa de los huevos y se anotan los datos:)

1. this group also recorded an independent variable, which is represented by... (este grupo también registró una variable dependiente, que está representada por...)

a. the change in mass of the eggs (el cambio de masa de los huevos)
b. the amount of time they were in the solution (el tiempo de permanencia en la solución)
c. the ending mass of the eggs (la masa final de los huevos)
d. the type of solution the egg is place in (el tipo de solución en la que se coloca el huevo)

1. in this experiment, the dependent variable they are testing is... (en este experimento, la variable independiente que están probando es...)

a. the ending mass of the eggs (la masa final de los huevos)
b. the type of solution the egg is place in (el tipo de solución en la que se coloca el huevo)
c. the change in mass of the eggs (el cambio de masa de los huevos)
d. the amount of time they were in the solution (el tiempo de permanencia en la solución)

Explanation:

• Question 4:
• The independent variable is the factor that is changed or manipulated in an experiment. In this case, the type of solution (distilled water, 50/50 mixture, 100% corn syrup) is what the researchers are changing.
• Options A (change in mass) and C (ending mass) are dependent variables as they depend on the solution. Option B (time) is a controlled variable (kept the same for all eggs - 24 hours).
• Question 5:
• The dependent variable is what is measured and affected by the independent variable. The change in mass of the eggs is what is being measured to see the effect of the solution type.
• Option A (ending mass) is related but the change (which accounts for starting mass) is a better measure. Option B is the independent variable. Option D is a controlled variable.

Answer:

1. D. the type of solution the egg is place in (el tipo de solución en la que se coloca el huevo)
2. C. the change in mass of the eggs (el cambio de masa de los huevos)