Reactants vs Products
The substances that are combined during a chemical reaction.
Reactants
A change in the chemical structure resulting in a new substance.
Chemical change
The process in which substances known as reactants, are converted into new substances known as products.
Chemical reaction
What happens when milk and sugar are combined?
The sugar dissolves into the milk.
New substances that result from a chemical reaction.
Product
What is evidence that a chemical change has ocurred?
Change in color
Change in temperature
Production of a gas or solid
Both physical and chemical changes affect matter, but physical changes are ____________ and chemical changes are _______________.
reversible, irreversible
What happens when you heat up the milk and sugar mixture?
the liquid will start to boil
In a chemical reaction in which sodium and chlorine are chemically combined to form salt, which are the reactants?
sodium and chlorine
Which of the following is an example of a chemical change?
a. a popsicle melting in the sun
b. boiling a pot of water
c. rust forming on your bike
d. rolling a ball of dough into a flat pizza
rust forming on your bike
An ice cube melts in a glass of water. Has a chemical reaction taken place? How do you know?
No, a phase change does not indicate a chemical change.
After heating the milk/sugar mixture the mixture will turn brown. What is that evidence of?
The color change is evidence of a chemical reaction.
In a chemical reaction in which sodium bicarbonate and vinegar are chemically combined to form carbon dioxide, water, and sodium acetate, which are the products?
carbon dioxide, water, and sodium acetate
Baking soda and vinegar chemically change. What evidence supports a chemical change?
a gas is produced
Which of the following is an example of a physical change?
a. sugar turning into caramel
b. rust forming on your bike
c. plants changing sunlight, water, and carbon dioxide into glucose and oxygen
d. rolling a ball of dough into a flat pizza
rolling a ball of dough into a flat pizza
After heating the milk and sugar mixture for long enough it will turn into caramel. This change is ____________ and cannot be _____________.
permanent, reversed
In a chemical reaction in which sodium bicarbonate and vinegar are chemically combined to form carbon dioxide, water, and sodium acetate, which are the reactants?
sodium bicarbonate and vinegar
A chemical reaction changes the ____________ of matter.
structure
Chemical or Physical
The leaves of a tree changes from green to brown in the fall.
The type of chemical reaction that takes place when making caramel is called the Maillard reaction. This is a chemical reaction which leads to the formation of brown molecules. Give another example of this.
browning meat (steak)
hamburgers
baked bread
roasting coffee beans
roasted potatoes