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. 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?
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
Which of the following is true of chemical properties? They
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
Scientists have developed special paints for the undersides of ships at sea. What problem are they trying to correct?
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
What hazards exist when mixing unknown chemicals?
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
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
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
An iron nail left outdoors for a year undergoes a chemical change. What evidence would visible? The nail would be
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
An iron nail rusts when left outdoors. Why might the nail no longer be useful?
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
How do you know when a chemical reaction has occurred?
rusting of metal parts
it is now made of a softer substance
has shrunk in size
rusty
a new substance has formed; it would be hard to reverse
A chemical change may create heat and expansion.
He knew a chemical property of baking soda is that it doesn’t burn
explain how the substance reacts with other substances
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