Chemistry, 05.02.2020 03:58 Alexandram2163
Sheeba is trying to determine how muisc affects a person's pulse rate. she has her mother listen to classic rock at a high volume for 30 minutes, her younger brother listen to classical muisc quietly while he sleeps at night, and her grandmother listen to 2 hours of rap at a medium volume. she records each person's pulse before and after listening to the muisc. what is missing from sheeba's scientific investigation? (1 point)
test subjects willing to participate in the experiment
a specific hypothesis to test with a controlled experiment
experimental data that can be recorded and analyzed
an experiment that takes initial and final measurements
Answers: 1
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What does x represent in the formula for the compound xcl4?
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Chemistry, 22.06.2019 03:00
Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture
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An object becomes electrically charged when: electrons are created in it electrons from it are destroyed electrons are transferred to it protons from it are destroyed protons are created in it
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15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.
Answers: 1
Sheeba is trying to determine how muisc affects a person's pulse rate. she has her mother listen to...
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