Which of the following is classified as an element?
How many known elements are there?
Which is not a mixture?
How many valence electrons are there in a magnesium atom?
How many valence electrons are there in a oxygen atom?
How many valence electrons are there in a sodium atom?
How many neutrons are in 25Mg?
The number of protons in carbon-13 is
Elements with the same number of protons that have a different number of neutrons, hence a different atomic mass are known as
What is the shape of an s orbital?
What is the electron configuration of boron?
What is the electron configuration of O2-?
JJ Thomson, when he discovered there were negative particles came up with which model of the atom?
Which of the following elements has the biggest radius?
Which of the following elements has the smallest radius?
Which of the following element is in the alkali metal group?
Which of the following elements has properties most similar to fluorine?
As you move from left to right across the second period of the periodic table:
What is true about covalent bonds?
In a chemical reaction between acetic acid and sodium hydrogen carbonate where sodium acetate, water and carbon dioxide are formed, which are the reactants?
Which of the following not true about chemical reactions?
Which substance is most likely ionic?
What is the charge on a sulfur ion
Select the correct name for: BF3
Select the correct name for: Mg(NO3)2
Choose the correct formula for sodium cyanide
Choose the formula for copper (II) hydroxide
Which coefficients prove the conservation of mass in the following equation: CO + Fe₂O₃ --> Fe + CO₂
Which coefficients prove the conservation of mass in the following equation: Cu + 2AgNO₃ --> 2Ag + Cu(NO₃)₂
The number of hours in 2 years can be calculated by which of the following?
What is the molar mass of NaOH?
How many moles are in 35.6 grams of iron?
How many grams does 2.1 moles of water weigh?
How many moles of NaCl are produced from 2.0 moles of AlCl3?
5.4 grams of NaCl needs how much AlCl3 to react completely?