Barbara completed an assignment for extra credit in science class. She used a pH meter to find the pH of different substances. After she finished measuring the pHs, she created a diagram that showed the substances arranged in order from the most acidic to the most basic.

If Barbara added lemon juice—pH 2.2—to her investigation, where should it appear in her diagram?
A.
between milk and water
B.
between soap and bleach
C.
to the left of cola
D.
between water and blood

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?