An experiment was designed to investigate the effect of caffeine on the heartbeat of bull dogs. Two populations of bull dogs were observed. Both
populations had water with the same mineral content, were supplied with
identical amounts of bacteria as food, received the same amount of
playtime and sleep, and had their temperature maintained at the same
constant temp. Every two hours, bull dogs from both populations were
selected and their heartbeats were monitored. The dogs of population A
had caffeine administered five minutes before their heartbeat was
checked. The dogs of population B were given nothing.
1. What is the independent variable in this experiment?
2. What is the dependent variable in this experiment?
3. Write a hypothesis, in the correct format, for this experiment.
4. What is the control group in this experiment?
5. What is the experimental group in this experiment?
6. List two constants in this experiment.

Why is nh3 classified as a polar molecule

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

1. an experiment in your science class lists the materials needed for the lab. it is your job, as a lab partner, to measure out 25 ml of distilled water and 2.5 grams of magnesium. what lab measuring tools would you choose to measure each substance and how would you use each tool to get the correct amounts? be sure to describe the process you would follow step-by-step. (5 points) 2.which of the following is an si base unit for measuring mass? (2 points) ampere gram meter pound 3.which of the following is an si base unit for time? (2 points) decades hours minutes seconds 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer. 5.a pencil beside a metric ruler. the ruler is scaled from 1 centimeter to 10 centimeters, with markings for millimeters between each number. one end of the pencil is beside the 0 on the ruler, and the pencil point is beside the 5. which of the following measurements is accurate but not precise? (2 points) 5 mm 5 cm 50 mm 50 cm 6. which of the following prefixes represents the largest value? (2 points) giga hector kilo milli 7. which of the following types of graphs is best for plotting the percentages of a whole value in a data set? (2 points) bar graph circle graph histogram line graph