Some studies has shown that peppermint odor increases people’s mental sharpness, especially when they solve math problems. which statements below best describes that can possibly make this scientific claim valid? a. if it is tested in a controlled setting with repeated results. b. if the test is published on wikipedia. c. if the scientist was previously peer reviewed. d. if the math problems are easy problems

The answer is A.  This involves taking a good sample (using sampling techniques) of mathematicians or maths students and subjecting them to different treatments of peppermint before sitting them in a maths exam and examining the maths results. This should also be compared to a control group – not subjected to peppermint but also sitting them for exams- with which to compare the results.  

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

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