Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
45 Cards in this Set
- Front
- Back
a short easy way to show a chemical reaction
|
chemical equation
|
|
a substance you have at the beginning of a reaction
|
reactant
|
|
a new substance produced in a reaction
|
product
|
|
during a chemical reaction, matter is not created or destroyed
|
conservation of mass
|
|
matter can enter from or escape to the surroundings
|
open system
|
|
matter is not allowed to enter or leave
|
closed system
|
|
a number in a chemical equation telling you how many atoms /molecules take part in a reaction
|
coefficient
|
|
combing two or more elements/compounds to make a more complex substance
|
synthesis
|
|
breaking down compounds into simpler products
|
decomposition
|
|
one element replaces another in a compound; also known as displacement
|
replacement
|
|
what is a chemical equation?
|
a short, easy way to show a chemical reaction
|
|
true or false
chemical equations use symbols instead of words to summarize chemical reactions |
true
|
|
If a molecule of carbon dioxide is involved in a chemical reaction, how is it represented in the chemical equation for the reaction?
|
by its chemical formula, CO₂
|
|
the substances you have when a chemical reaction is complete are called?
|
products
|
|
what does the arrow in a chemical equation mean?
|
yields
|
|
is the chemical equation below a reactant or a product?
Fe + S -> FeS What does Fe mean? |
reactant
|
|
is the chemical equation below a reactant or a product?
Fe + S -> FeS What does S mean? |
reactant
|
|
is the chemical equation below a reactant or a product?
Fe + S -> FeS What does FeS mean? |
product
|
|
true or false
chemical equations have no real structure |
false
|
|
a chemical equation summarizes a reaction
|
true
|
|
the formulas for the reactants are written on the right
|
false
|
|
symbols in the equation show the reactants and the products
|
true
|
|
True or false
All the atoms present at the start of a reaction are present at the end. |
true
|
|
at the end of a chemical reaction, what is the total mass of the reactants compared to the total mass of the products?
|
the total mass of the reactants is the same as the total mass of the products
|
|
what is the principle called the the conservation of mass?
|
during a chemical reaction, matter is not created or destroyed.
|
|
describe an open system
|
matter can enter from a escape to the surroundings
|
|
what is an example of a closed system
|
a sealed plastic bag
|
|
when is a chemical equation balanced?
|
when it accurately represents the conservation of mass by showing the same number of each type of atom on both sides of the equation.
|
|
how many atoms of oxygen are there on each side of the following chemical equation: 2Mg + O₂ -> 2MgO
|
2 atoms of oxygen on each side
|
|
is this chemical equation balanced, yes or no?
H₂ + O₂ -> H₂O |
no
|
|
is this chemical equation balanced, yes or no?
Mg + O₂ -> MgO |
No
|
|
is this chemical equation balanced, yes or no?
Na + O₂ -> Na₂O |
no
|
|
is this chemical equation balanced, yes or no?
2H₂O₂ -> 2H₂O + O₂ |
yes
|
|
a number placed in front of a chemical formula in a chemical equation is called?
|
a coefficient
|
|
What does a coefficient tell you?
|
it tells you how many atoms or molecules of each reactant or product take part in the reaction.
|
|
Why is this chemical equation not balanced?
H₂ + O₂ -> H₂O |
2 oxygen atoms on the reactant side and only 1 oxygen on the product side
|
|
what is the balance equation for this reaction: oxygen reacts with hydrogen to yield water.
a) 2H + O₂ -> 2H₂O b) 2H₂ + O₂ -> 2H₂O c) H₂ + O₂ -> 2H₂O d) Hx + O₂ -> H₂O |
b
|
|
what three categories can chemical reactions be classified?
|
synthesis
decomposition replacement |
|
which category of chemical reactions comes from a term that means "to put things together"
|
synthesis
|
|
what is the category of chemical reaction for two or more substances combined to make a more complex compound?
|
synthesis
|
|
what is the category of chemical reaction for compounds that are broken down into smaller products
|
decomposition
|
|
what is the category of chemical reaction for when one element replaces another in a compound, or two elements in different compounds trade places
|
replacement
|
|
Classify the following equation as synthesis, decomposition or replacement
CaCO₃ -> CaO + CO₂ |
decomposition
|
|
Classify the following equation as synthesis, decomposition or replacement
2Na + CI₂ -> 2NaCI |
synthesis
|
|
Classify the following equation as synthesis, decomposition or replacement
Mg + CuSO₄ -> MgSO₄ + Cu |
replacement
|