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How do you know when a chemical reaction has occurred?
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
Which of the following is true of chemical properties? They
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
. A student puts out fire on the stove by dumping baking soda on the flame. How has the student used scientific knowledge in his daily life?
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
A chemical change occurs when an egg cooks. What effect does the chemical change have on the physical properties of the egg?
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
What hazards exist when mixing unknown chemicals?
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
A balloon is placed in a freezer and left overnight. Which would be evidence that a physical change occurred when the freezer was opened the next day? The balloon
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
An iron nail left outdoors for a year undergoes a chemical change. What evidence would visible? The nail would be
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
Scientists have developed special paints for the undersides of ships at sea. What problem are they trying to correct?
has shrunk in size
rusting of metal parts
explain how the substance reacts with other substances
the egg has new physical properties
He knew a chemical property of baking soda is that it doesn’t burn
a new substance has formed; it would be hard to reverse
rusty
A chemical change may create heat and expansion.
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