Which of the following shows a periodic pattern?

A. there are two ducks in one pond.

B. there is meat next to the cheese in the refrigerator

C. a boy waits five minutes to talk to his father

D. the mother takes her medication everyday at seven

A student is using the periodic table to find information for a report on elements. One of the statements about fluorine in her report contains an error. Find the error, and write your replacement for the error beneath the statement.

The frequency, wavelength, and amplitude of a simple wave can best be described as what?

What are group 6a elements likely to do when they form ions-gain electrons or lose them? what are group 6a elements likely to do when they form ions-gain electrons or lose them? lose electronsgain electrons?

Jack's teacher has a box of objects. He asks each student to pull out an object and identify whether it is a mixture or a pure substance Jack pulls out a bowl of mixed fruit. What is this object and why is it a mixture or a pure substance? A.

The gas pressure in an oxygen tank is 3.90 atm at a temperature of 298 K. If the pressure decreases to 3.20 atm, what is the temperature of the gas in kelvin?

Watch It! #3 After watching the examples in the video of radiation, list 2 other examples that you come up with on your own.

Tear gas has the composition 40.25% carbon, 6.19% hydrogen, 8.94% oxygen, 44.62% bromine. what is the empirical formula of this compound?

Explain why ships traveling from east to west across the Atlantic take days longer than ships traveling the same distance from west to east.

In a titration 25.0 ml of a. 20 M NaOH solution is used to neutralize 10.0 ml of HCl. Write the equation for this neutralization reaction and calculate the molarity of the acid.

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?