Write electron configurations for the elements that are identified by these atomic numbers

a. 15

b. 12

c. 9

d. 18

Explain what must happen in order for the oxygen atom to become negatively charged.

A student finds an object with a mass of 64.5 g and a volume of 14 cm3. Find the density of the object. Could the object be gold? (10 pts.

What initial temperature of the copper metal which equal to the temperature of the coffee? Mass of metal = 29.8801 g T i = 18.2 degree Celsius T f = 20.1 degree Celsius Specific heat 0.384 J/g degree Celsius

Which of the following is an organic compound? salt chicken water silver

Which of the following statements is incorrect? A. Molecular mass is expressed in atomic mass units. B. Formula mass compares the mass of one formula unit of a substance to the mass of one atom of carbon-12. C.

What is an empirical formula? O A. The chemical formula that reveals how the molecule actually exists in nature O B. The chemical formula that is written in terms of percent composition O C.

What part of an original isotope's number of atoms remains after two half lives?

What gas has formed when bubels form when water is boiled?

A physical property can be observed or measured without changing the identity of a substance. Which of these choices describes a physical property? The temperature at which a liquid will boil. The tendency of a substance to explode.

What is the correct order of sediment size from smaller particles to bigger particles?