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What is a chemical reaction?
A process that transforms starting substances into new substances.
What is the difference between raw and ripened fruit?
- Raw fruit: Starting substance
- Ripened fruit: New substance with changed properties
What differentiates fermented injera from teff flour?
- Teff flour: Starting material
- Fermented injera: New material with changed properties
Are the changes in fruit ripening and fermentation reversible?
No, these are irreversible changes.
Is the change of dough to bread reversible?
No, baking is an irreversible change.
Is burning firewood to ash reversible?
No, this change is irreversible.
Does a farmer’s fertilizer calculation refer to quality or quantity?
Quantity.
Does a nurse's medicine dose calculation refer to quality or quantity?
Quantity.
Does a chef mixing ingredients refer to quality or quantity?
Quantity.
What are examples of chemical changes?
- Burning of wood
- Rusting of iron
- Evaporation of liquids
What are examples of physical changes?
- Dissolving sugar in water
- Melting ice
- Boiling water
What occurs when wood burns?
It undergoes a chemical change producing ash and heat.
What are physical changes? Provide an example.
- Evaporation of liquids
- Melting of ice
What are chemical changes? Provide an example.
- Turning milk into curd
- Photosynthesis in plants
List two evidences of chemical reactions.
- Production of gas
- Change in temperature
What is a chemical equation?
A shorthand notation representing a chemical reaction using chemical symbols.
What is stoichiometry?
The quantitative study of the amounts of reactants and products in a chemical reaction.
What is the reaction of sulfur with oxygen?
Produces sulfur dioxide, a colorless gas with a pungent odor.
What does a balanced chemical equation indicate?
Describes the relationships between the amounts of reactants and products.
What are the characteristics of chemical reactions?
- Formation of new substances
- Production of heat or light
- Change in color
What is photosynthesis?
A process where green plants convert light energy into chemical energy.
Include an image of writing a chemical equation.
Writing chemical reactions involves representing them in a systematic way.
What method can be used to balance chemical equations?
- Inspection method
- Least Common Multiple (LCM) method
- Algebraic method
What are chemical symbols used for in a chemical equation?
They represent the substances involved in a chemical reaction.
What is the difference between a chemical equation and a chemical reaction?
A chemical equation is a representation of a chemical reaction using symbols and formulas.
What are the starting substances in a chemical equation called?
Reactants
What are the new substances produced in a chemical equation called?
Products
How are reactants and products displayed in a chemical equation?
Reactants are on the left, products on the right, separated by an arrow (→).
What is the first step in writing a chemical equation?
Write a word equation using words to describe the reaction.
What is an example of a word equation?
Hydrogen + Nitrogen → Ammonia
What comes after writing a word equation?
Write the symbols and formulas for reactants and products.
What is the unbalanced chemical equation for hydrogen and nitrogen reacting?
H₂ + N₂ → NH₃
What law is applied when balancing a chemical equation?
The Law of Conservation of Mass.
What is the balanced equation for the reaction of hydrogen and nitrogen?
3H₂ + N₂ → 2NH₃
What symbols represent states of matter in chemical equations?
- (s) - Solid
- (l) - Liquid
- (g) - Gas
- (aq) - Aqueous solution
What is the word equation for calcium carbonate and sulfuric acid?
Calcium carbonate + Sulfuric acid → Calcium sulfate + Water + Carbon dioxide
What is the chemical equation for the reaction of calcium carbonate and sulfuric acid?
CaCO₃(s) + H₂SO₄(l) → CaSO₄(s) + H₂O(l) + CO₂(g)
What is the balanced equation for sodium chloride and silver nitrate?
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
What are the conditions a chemical equation must fulfill?
- Represents a true reaction
- Correct symbols/formulas
- Must be balanced
What are diatomic molecules in chemical equations?
- Hydrogen
- Nitrogen
- Oxygen
- Fluorine
- Chlorine
- Bromine
- Iodine
What does a chemical equation express in quantitative terms?
Relative number of moles, molecules, or masses of reactants and products.
What does the balanced equation 2H₂ + O₂ → 2H₂O indicate qualitatively?
The reaction between hydrogen and oxygen forms water.
What does the balanced equation 2H₂ + O₂ → 2H₂O indicate quantitatively?
Two units of hydrogen combine with one unit of oxygen to form two units of water.
Flashcards in this deck (43)
-
What is a chemical reaction?
A process that transforms starting substances into new substances.
chemistry definitions -
What is the difference between raw and ripened fruit?
- Raw fruit: Starting substance
- Ripened fruit: New substance with changed properties
biology food -
What differentiates fermented injera from teff flour?
- Teff flour: Starting material
- Fermented injera: New material with changed properties
biology food -
Are the changes in fruit ripening and fermentation reversible?
No, these are irreversible changes.
chemistry changes -
Is the change of dough to bread reversible?
No, baking is an irreversible change.
chemistry baking -
Is burning firewood to ash reversible?
No, this change is irreversible.
chemistry burning -
Does a farmer’s fertilizer calculation refer to quality or quantity?
Quantity.
agriculture measurements -
Does a nurse's medicine dose calculation refer to quality or quantity?
Quantity.
health measurements -
Does a chef mixing ingredients refer to quality or quantity?
Quantity.
cooking measurements -
What are examples of chemical changes?
- Burning of wood
- Rusting of iron
- Evaporation of liquids
chemistry examples -
What are examples of physical changes?
- Dissolving sugar in water
- Melting ice
- Boiling water
chemistry examples -
What occurs when wood burns?
It undergoes a chemical change producing ash and heat.
chemistry burning -
What are physical changes? Provide an example.
- Evaporation of liquids
- Melting of ice
chemistry physical_changes -
What are chemical changes? Provide an example.
- Turning milk into curd
- Photosynthesis in plants
chemistry chemical_changes -
List two evidences of chemical reactions.
- Production of gas
- Change in temperature
chemistry reactions -
What is a chemical equation?
A shorthand notation representing a chemical reaction using chemical symbols.
chemistry chemical_equations -
What is stoichiometry?
The quantitative study of the amounts of reactants and products in a chemical reaction.
chemistry stoichiometry -
What is the reaction of sulfur with oxygen?
Produces sulfur dioxide, a colorless gas with a pungent odor.
chemistry reactions -
What does a balanced chemical equation indicate?
Describes the relationships between the amounts of reactants and products.
chemistry chemical_equations -
What are the characteristics of chemical reactions?
- Formation of new substances
- Production of heat or light
- Change in color
chemistry reactions -
What is photosynthesis?
A process where green plants convert light energy into chemical energy.
biology photosynthesis -
Include an image of writing a chemical equation.
Writing chemical reactions involves representing them in a systematic way.
chemistry chemical_equations -
What method can be used to balance chemical equations?
- Inspection method
- Least Common Multiple (LCM) method
- Algebraic method
chemistry balancing -
What are chemical symbols used for in a chemical equation?
They represent the substances involved in a chemical reaction.
chemistry symbols -
What is the difference between a chemical equation and a chemical reaction?
A chemical equation is a representation of a chemical reaction using symbols and formulas.
chemistry definitions -
What are the starting substances in a chemical equation called?
Reactants
chemistry terminology -
What are the new substances produced in a chemical equation called?
Products
chemistry terminology -
How are reactants and products displayed in a chemical equation?
Reactants are on the left, products on the right, separated by an arrow (→).
chemistry structure -
What is the first step in writing a chemical equation?
Write a word equation using words to describe the reaction.
chemistry writing -
What is an example of a word equation?
Hydrogen + Nitrogen → Ammonia
chemistry examples -
What comes after writing a word equation?
Write the symbols and formulas for reactants and products.
chemistry writing -
What is the unbalanced chemical equation for hydrogen and nitrogen reacting?
H₂ + N₂ → NH₃
chemistry equations -
What law is applied when balancing a chemical equation?
The Law of Conservation of Mass.
chemistry laws -
What is the balanced equation for the reaction of hydrogen and nitrogen?
3H₂ + N₂ → 2NH₃
chemistry reactions -
What symbols represent states of matter in chemical equations?
- (s) - Solid
- (l) - Liquid
- (g) - Gas
- (aq) - Aqueous solution
chemistry states_of_matter -
What is the word equation for calcium carbonate and sulfuric acid?
Calcium carbonate + Sulfuric acid → Calcium sulfate + Water + Carbon dioxide
chemistry word_equation -
What is the chemical equation for the reaction of calcium carbonate and sulfuric acid?
CaCO₃(s) + H₂SO₄(l) → CaSO₄(s) + H₂O(l) + CO₂(g)
chemistry chemical_equation -
What is the balanced equation for sodium chloride and silver nitrate?
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
chemistry reactions -
What are the conditions a chemical equation must fulfill?
- Represents a true reaction
- Correct symbols/formulas
- Must be balanced
chemistry equations -
What are diatomic molecules in chemical equations?
- Hydrogen
- Nitrogen
- Oxygen
- Fluorine
- Chlorine
- Bromine
- Iodine
chemistry diatomic_molecules -
What does a chemical equation express in quantitative terms?
Relative number of moles, molecules, or masses of reactants and products.
chemistry quantitative -
What does the balanced equation 2H₂ + O₂ → 2H₂O indicate qualitatively?
The reaction between hydrogen and oxygen forms water.
chemistry qualitative -
What does the balanced equation 2H₂ + O₂ → 2H₂O indicate quantitatively?
Two units of hydrogen combine with one unit of oxygen to form two units of water.
chemistry quantitative