What is the reason the group 13 metals have a typical charge of 3+?

What two quantities must be known to calculate the density of a sample of matter? a. mass and volume b. length and mass c. size and weight d. weight and volume

Dinitrogen difluoride gas is collected at 22.0 degree C in an evacuated flask with a measured volume of 25.0L. When all the gas has been collected, the pressure in the flask is measured to be 0.170atm.

What is the mass of 5.30*1021 platinum atoms?

Carbon disulfide burns in oxygen to yield carbon dioxide and sulfur dioxide according to the chemical equation cs2 (ℓ) + 3 o2 (g) - → co2 (g) + 2 so2 (g). if 1.25 mol of cs2 is combined with 0.57 mol of o2, identify the limiting reactant.

Which of the following is true of alpha decay?* 0 It is the most penetrating form of radiation O It has a negative particle O It is equivalent to a helium nucleus (2 protons and 2 neutrons) O It is a form of electromagnetic energy

Nonrenewable resources are natural resources that are limited in supply and cannot be replaced as quickly as they are used up. True or false

Which method for treating arthritis is an example of pseudoscience? diet drugs exercise magnets

Only a small portion of the organisms that lived in the geologic past have been preserved as fossils. Which condition best increases the chance that an organism will become fossilized?

Which one of the following electron transitions does not correspond to an absorbtion of a quanta of light? 1. n = 4 to n = 6 2. n = 7 to n = 5 3. n = 2 to n = 5 4. n = 2 to n = 6 5. None of the Above

Which atom has a change in oxidation number of - 3 in the following redox reaction K2Cr2O7 + H2O + S - - > KOH + Cr2O3 + SO2