Which of the following elements is only made in laboratories?

sb

cm

te

tb

How many moles of nitrous oxide gas (N2O) is contained in 20.0 L balloon at a pressure of 1.09 atm and a temperature of 298K? Round to the nearest hundredths place.

Which of these pairs of elements have the same number of valence electrons? A) oxygen (O) and bromine (Br) B) selenium (Se) and bromine (Br) C) carbon (C) and lead (Pb) D) oxygen (O) and carbon (C) E) sodium (Na) and magnesium (Mg)

What does Xeon and cesium have in common?

How an air mattress supports the weight of a person lying on it

The bond formed from electrons that are transferred is a (n) ionic bond hydrogen bond covalent bond

Target tissues of hormones are always near the glands that release the hormones. true or false

What four things affect the tides

What fraction of the enzymes will be active at ph=4.07 explain?

The temperature of a liquid is measured to be 212 °F. Soon afterward, the temperature is taken again and is determined to be 100 °C. Which of these is a possible true statement about the motion of the liquid's particles? A.

In a solution at 25°C, the [H+] is 3.5 * 10-6 M. What is the [OH-]?