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30 Cards in this Set

  • Front
  • Back
To balance an equation, numbers called ________ are placed in front of substances. They multiply all atoms in that substance.
coefficients
When balancing a chemical formula, non-1 numbers, called ____ are placed to the lower right of an ion.
subscript
The word ____ means "written below"
subscript
Oxidation numbers or ionic charges are written to the upper right of the ion. A name for anything written there a ___
superscript
The arrrow in the middle of a chemical equation means....
yields
produces
equals
If the left side of a chemical equation has 10 H's and 5 O's then the right side of the equation must have....
10 H's and 5 O's
Matter can neither be created....
nor destroyed.
Can subscripts be added to a formula to balance an equation?
No
Can subscripts be removed from a formula to balance an equation?
No
How must the elements Br, I, N, Cl, H, O, & F be written in an equation when they are alone?
They must have a subscript 2 since they are diatomic elements.
Which gas supports combustion and causes a glowing splint to relight?
oxygen
Which gas extinguishes flames in the flaming splint test?
carbon dioxide
Which simple gas burns with a barking sound when a flaming splint is brought near?
hydrogen
Which reaction type only has one product (no plus signs on the right)?
synthesis
Which reaction type only has one reactant (no plus signs on the left)?
decomposition
The _____ are written on the left side of the yields arrow.
reactants
The ___ are written on the right side of the yields arrow.
products
The symbol for a solid or precipitate in a chemical reaction is....
(s)
Another name for a solid that is produced in a reaction is a ...
precipitate
The symbol for a water-based solution in a chemical reaction is ....
(aq)
The symbol for a pure liquid such as water or mercury in a chemical reaction is...
(l)
The symbol for a gas in a chemical reaction is....
(g)
A reaction that has 2 single elements and 2 compounds is ...
single replacement
A reaction that involves 4 compounds is...
double replacement
The reaction that has a hydrocarbon compound + oxygen to produce carbon dioxide + water + heat is....
combustion
Reactions that release heat are said to be....
exothermic
Reactions that require that heat be added to make them occur are called...
endothermic
A reaction in a test tube that makes the test tube cold is an ___ reaction.
endothermic
A reaction in a test tube that makes the test tube hot is an ____ reaction
exothermic
To make baking soda release carbon dioxide in a decomposition reaction, we had to heat it strongly with a burner. This is an example of an ____ reaction.
endothermic