Formulas
The chemical formula for water.
What is H2O?
Calcium carbonate is an ionic substance commonly called "chalk". If this molecule has one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O), its chemical formula is this.
What is CaCO3?
This causes surface tension.
What is cohesion?
Substances that undergo a chemical change
What are reactants?
A molecule that has a slight positive and negative charges due to an imbalance in the way electrons are shared.
What is a polar molecule?
A subscript is used to show this.
What is the number of atoms of an element or compound?
A compound that has 1 zinc (Zn) atom and 2 chlorine (Cl) atoms has this compound chemical formula.
What is ZnCl?
What is water's polarity and hydrogen bonding?
New substances formed as a result of a chemical change.
What are products?
The force of attraction between molecules of the same substance so that they tend to stay together?
What is cohesion?
A coefficient is used to show this.
What is how many molecules of each atom or compound is needed to balance a chemical equation?
This many atoms of each element are in the compound AgNO3? (Hint: Ag is the symbol for silver, N is the symbol for nitrogen and O is the symbol for oxygen.)
What is 1 silver atom, 1 zinc atom and 2 chlorine atoms?
Suppose you were able to count the molecules in 1 liter of water and 1 liter of ice. This one would have more molecules.
What is water? (Molecules in solid water are further apart then molecules in liquid water).
Numbers that appear before a formula in a chemical equation to show how many atoms or molecules of each reactant or product are involved in the reaction.
What are coefficients?
The force of attraction between molecules of different substance so that they tend to stick together
What is adhesion?
This pair has the same electron configuration. (You may use the periodic table in the front of the text if you need to).
a.)Cl- and Ar b.) Cl and Ar,
c. Cl- and Ar- d. Cl+ and Ar
An important component of gasoline is octane which is composed of molecules that have eight carbon atoms (C) and eighteen hydrogen atoms. the chemical formula for octane is this.
What is C8H18?
What is by either transferring electrons (ionic bonds) or sharing electrons (covalent bonds).
A chemical bond formed between oppositely charged ions.
What is an ionic bond?
When atoms lose electrons they become positive ions called this.
What are cations?
The charge on a chloride ion, since Chlorine is a Group 7A element.
What is 1-? (Chlorine has 7 valence electrons so when it gains one more, it has a charge of 1-)
Carbon dioxide (CO2) is one of the gases we exhale when we breathe. Carbon monoxide (CO) is a poisonous gas associated with burning things under conditions of low oxygen. CO2 has this many atoms. CO has this many atoms. (Bonus 100 pts for answering both)
What are 3 atoms (CO2)?
and
What are 2 atoms (CO)?
This happens to atoms when they form a polar covalent bond.
A chemical bond in which two atoms share one or more pairs of valence electrons
What is a covalent bond?
Each dot in an electron dot diagram represents this.
What is a valence electron?