Chemistry, 19.08.2019 00:30 Tnaaasty8812

In the same science fair, tina ask the question "does caffeine increase the heart rate of an earthworm? " in test 1,she measures the heart rate by looking at the earthworm under a microscopes, the heart rate if 50 beats per minute. in test 2,she places a few drops of caffeine on the earthworms skin and measures the rate again. in this test the heart rate is 68beats per minute
what is the independent variable in this experiment
what is the dependent variable in this experiment
tina's experiment should have included a hypothisis .in a complete sentence, suggest a hypothesis for tina's experiment

Answers: 1

Show answers

Another question on Chemistry

Chemistry, 22.06.2019 01:30

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Answers: 1

Answer

Chemistry, 22.06.2019 06:00

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

Answers: 3

Answer

Chemistry, 22.06.2019 08:30

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Answers: 1

Answer

Chemistry, 22.06.2019 22:30

Vi limitens. vastery test select the correct answer. which statement explains why large atoms are more reactive than small atoms? a. large atoms have valence electrons farther from the nucleus and lose them more readily. b. large atoms have greater ionization energy, which they can utilize during a reaction. c. large atoms have a greater number of electrons that they can lose during a reaction. d. large atoms have more energy levels, so they have more energy to pass on in a reaction. reset next

Answers: 3

Answer

You know the right answer?

In the same science fair, tina ask the question "does caffeine increase the heart rate of an earthwo...

Questions