General Chemistry

According to the table above, how many electrons are required to produce a charge of –2.0 C?

If the charge and mass of one proton is 1.60218 x 10^-19 C and 1.673 x 10^-30 g respectively, what is the charge of 378 kg of protons?

Which of the following answers give the correct number of subatomic particles for ?

Which of the following answers give the correct number of subatomic particles for ?

Fill in the gaps for the following table of atoms.

Give the correct number of protons, neutrons and electrons for the following isotope:.

In which pair are the two species both isoelectronic and isotopic?

One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. The cation that this atom forms has 28 electrons. What is the symbol of the cation?

Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons?

Fill in the gaps for the following table.

Which of the following choices has the greatest atomic mass?

Only three isotopes of magnesium exist on earth. ²⁴Mg is the most common form at 78.70% natural abundance with a mass of 23.98504 amu, ²⁵Mg has a 10.13% natural abundance, while ²⁶Mg has a natural abundance of 11.17% and a mass of 25.98259 amu. What is the mass of the ²⁵Mg isotope?

Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope?

Which of the following is a metalloid that is also a chalcogen?

Which of the following is a representative element, found in the 3rd Period, that is also a pnictogen.

State the element symbol found in the 6th Period and Group 7A.

Based on the number of protons each element has, which would you expect to be chemically similar?

Which of the following is a homonuclear polyatomic element?

Which of the following elements is a nonmetal that is a homonuclear polyatomic solid?

Which of the following exists as a diatomic solid at room temperature?

Which element possesses a -2 charge when it combines with other elements?  

What is the likely charge of the element with an atomic number of 47?

How many electrons would the cadmium ion possess?  

Calculate the molecular weight of C₃H₅N₃O₃.

The reaction between nickel metal and hydrochloric acid is not a simple dissolution. The product formed is NiCl₂ • 6 H₂O (s), nickel (II) chloride hexahydrate, which has exactly 6 waters of hydration in the crystal lattice for every nickel ion. What is the molar mass of nickel (II) chloride hexahydrate, NiCl₂ • 6 H₂O (s)?

What is the molar mass of diazepam also known as Valium if 0.05570 mol weighs 15.86 g?

If a sample of sodium chloride, NaCl, contains 73.1 kg, what is its number of formula units?

Calculate the number of oxygen atoms found in 783.9 g NiCl₂ • 6 H₂O.

If the density of water is 1.00 g/mL at 25°C, calculate the number of water molecules found in 1.50 x 10³ µL of water.

A cylindrical copper wire is used for the fences around a house. The copper wire has a diameter of 0.0750 in. How many copper atoms are found in 5.160 cm piece? The density of copper is 8.96 g/cm³. (V = π • r² • h)