Select the correct answer.

Haley rubs a cotton cloth along a plastic strip. The plastic strip becomes positively charged. Why did this happen?

Which of the following is an example of how a scientist might use a model? A. The end of a slinky is moved vertically up and down to simulate a wave B. A wrench is used to tighten a nut onto a piece of wood C.

Write the formula for aluminum oxide.

In the molecule hcl, which atom is the negative pole? in the molecule, which atom is the negative pole? cl h

How is the Nazca plate moving in relation to the Pacific plate?

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

When an ionic compound is named or its formula is written, what sort of element is placed first? What is the charge on its ions?

A larger glass has 100 mL of a liquid and a smaller glass has 50 mL of a liquid. Which glass of liquid would have more energy? Calculations must be done first because energy depends on both temperature and mass.

Xco3 enter the group number of x

A carbon molecule that has a different arrangement of atoms is known as a/an a. isomer. b. nucleotide. c. peptide. d. monomer.

A 10.0 ml solution of 0.300 m nh3 is titrated with a 0.100 m hcl solution. calculate the ph after the addition of 10.0 ml hcl.