64 Questions
What is a reactant in a chemical reaction?
A substance that takes part in and undergoes change during a chemical reaction
What is the term for the numbers placed before the formulae in a chemical equation?
Coefficients
What is the product of the reaction between carbon and oxygen?
Carbon dioxide
What is the definition of a compound?
A substance made up of two or more different elements that are chemically bonded together
What is fermentation?
A metabolic process that produces chemical changes in organic substrates through the action of enzymes
What is the term for the symbolic representation of a chemical reaction?
Chemical equation
What is true about a chemical reaction?
Atoms are rearranged to form new compounds
What is an example of a compound?
Water
What is the product of the combustion reaction between hydrogen and oxygen?
Water (H2O)
What is the purpose of fermentation?
To produce alcohol and carbon dioxide
What is a visible sign of a chemical reaction?
Change in color
What is the product of the reaction between ammonium dichromate and oxygen?
Water (H2O) and chromium oxide (Cr2O3)
What is the career of someone who discovers new compounds?
Chemist
Who is the renowned chemist and physicist known for her research on radioactivity?
Marie Curie
What is the reactant in the combustion reaction between hydrogen and oxygen?
Hydrogen gas (H2)
What is the equation for the reaction between glucose and yeast?
C6H12O6 → 2C2H5OH + 2CO2
What occurs during a chemical reaction?
Atoms are rearranged to form new compounds.
What is the result of the reaction between carbon and oxygen?
One atom of carbon and one molecule of carbon dioxide.
What is a characteristic of a compound?
It is composed of at least two different elements.
What do coefficients in a chemical equation represent?
The number of units of each substance involved in the reaction.
What is formed as a result of a chemical reaction?
A product.
What is the process of producing chemical changes in organic substrates through the action of enzymes?
Fermentation.
What is an example of a compound that is composed of hydrogen and oxygen?
Water (H_2O).
What is the term for the substances that take part in and undergo change during a chemical reaction?
Reactants.
What is a characteristic of a combustion reaction?
It involves the formation of new bonds between atoms.
What is the role of yeast in fermentation?
To convert sugars into alcohol and carbon dioxide.
What is a common sign of a chemical reaction?
All of the above.
What is the purpose of chemistry in various careers?
To discover new compounds and develop new medicines.
What is the equation for the reaction between ammonium dichromate and oxygen?
(NH4)2Cr2O7 → N2 + 4H2O + Cr2O3
What is the product of the reaction between hydrogen and oxygen?
Water only.
What is the common name for the reaction between glucose and yeast?
Fermentation.
What is the significance of Marie Curie's work?
She won Nobel Prizes in two different scientific fields.
In a chemical reaction, what is the primary difference between reactants and products?
Reactants are broken down, while products are formed.
What is the main purpose of coefficients in a chemical equation?
To balance the equation
What is the result of the rearrangement of atoms in a chemical reaction?
Formation of new compounds
What is the primary difference between a compound and a mixture?
A compound has a fixed ratio of elements, while a mixture does not
What is the purpose of fermentation in biochemical processes?
To produce ethanol and acids
What is the symbolic representation of the reaction between carbon and oxygen?
C + O2 → CO2
What is the term for the process of forming a new compound from two or more different elements?
Compound formation
What is the result of the breaking of bonds in the reactants during a chemical reaction?
Formation of new bonds in the products
What is the primary difference between combustion and fermentation reactions?
Combustion reactions involve the formation of new bonds, while fermentation reactions involve the breaking of existing bonds.
What is the role of microorganisms in fermentation?
They convert sugars into alcohol and carbon dioxide.
What is the characteristic of a chemical reaction that is visually spectacular?
All of the above.
What is the product of the reaction between hydrogen and oxygen in the presence of a spark?
Water and heat.
What is the significance of Marie Curie's work?
She was the first woman to win a Nobel Prize in two different scientific fields.
What is the role of yeast in the reaction between glucose and oxygen?
It converts glucose into ethanol and carbon dioxide.
What is the difference between a combustion reaction and a chemical reaction?
Combustion reactions are a type of chemical reaction, but not all chemical reactions are combustion reactions.
What is the purpose of chemistry in various careers?
To discover new compounds and improve existing products.
What occurs when bonds are broken in the reactants during a chemical reaction?
Atoms are rearranged to form new bonds
What is the primary purpose of coefficients in a chemical equation?
To indicate the number of units of each substance involved in the reaction
What is the result of the rearrangement of atoms in a chemical reaction?
The formation of new compounds
What is the characteristic of a compound?
It is composed of two or more different elements
What is the difference between reactants and products in a chemical equation?
Reactants are the substances that undergo change, while products are the resulting substances
What is the purpose of fermentation?
To produce chemical changes in organic substrates through the action of enzymes
What is the symbolic representation of a chemical reaction?
A chemical equation
What occurs during a chemical reaction?
The arrangement of atoms in the reactants is rearranged to form new bonds
What type of chemical reaction occurs when coal burns in oxygen?
Combustion
What is the purpose of fermentation in biochemical processes?
To produce carbon dioxide and ethanol
What is the visible sign of the reaction between ammonium dichromate and oxygen?
Bright orange sparks
What is the role of microorganisms in fermentation?
To convert sugars into ethanol and carbon dioxide
What is the common application of chemistry in various careers?
All of the above
What is the result of the reaction between hydrogen and oxygen?
Formation of water
What is the characteristic of a chemical reaction that is visually spectacular?
Change in color
What is the significance of Marie Curie's work?
She was the first woman to win a Nobel Prize in two different scientific fields
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