6.1 guided reading
The study of matter and how Matter changes is called _____?
Chemistry
What is matter?
-Anything that has mass and takes up space
Chemical property
-how it can be observed: by changing one substance into another -ex./ ability to burn
Physical property
-how it can be observed: without changing one substance into another -ex./ color
If you detect a change in the color of a material, why does this indicate that a chemical reaction might have occurred?
-matter's property of color has changed to another
What are the two main kinds of changes that you can observe when chemical reactions occur?
-changes in the properties —reactants turn into products
A change in matter that produces one or more new substances is a ____?
-chemical change
Suppose you mix two clear liquids together and bubbles form. What type of change might this indicate? Explain.
-chemical change as the 2 liquids are having a reaction with each other causing bubbles to form (breaking bonds and creating new ones)
Endothermic reaction
-energy is absorbed -ex./ mixing baking soda and vinegar
Exothermic reaction
-energy is released -ex./ burning wood
What are some examples of physical change?
-flattening/pulling on a marshmallow -tearing a paper
Bending a straw and braiding hair are examples of what?
-physical changes in matter
A solid that forms during a chemical reaction is called a ______?
-precipitate
Why does a change in temperature indicate that a chemical reaction may have occurred?
-sign of a chemical reaction is that one or more new substances are produced -ex./ when water boils, gas bubbles rise
What happens to the bonds between atoms when chemical changes occur?
-the bonds break apart and bond with new atoms to create new outcomes
What are some examples of a chemical change?
-toasting a marshmallow -making/baking bread
True or false? A physical change never alters the form or appearance of a substance?
False
True or false? A change in energy occurs during a chemical reaction.
True
True or false? Endothermic reactions always result in a decrease in temperature?
True