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If you heat sugar, it turns brown and produces smoke. Is this a physical or chemical change? Why?
Chemical change, because new substances are formed.
A student says that seawater is a compound. Do you agree? Why or why not?
No, because seawater contains different substances (water, salt, minerals) that are not chemically bonded.
You mix sand and salt together. Is this a mixture or a compound? How can you separate them?
A mixture. You can separate them by dissolving the salt in water, filtering the sand, and evaporating the water.
What type of change occurs when making a salad—physical or chemical?
Physical change, because the ingredients retain their properties.
What is an alloy? Give an example.
An alloy is a mixture of metals. Example: Nitinol (nickel + titanium).
What are the main components of air?
Nitrogen (Nâ‚‚), oxygen (Oâ‚‚), carbon dioxide (COâ‚‚), and other gases
Is air a mixture or a compound? Why?
A mixture, because it contains different gases that are not chemically bonded.
What happens when iron filings and sulfur are mixed without heating?
They form a mixture that can be separated using a magnet.
Give two examples of mixtures in everyday life.
Air, seawater, salad, mud, etc.
Can you usually separate mixtures easily? Why?
Yes, because the substances in a mixture are not chemically bonded and can be separated by physical methods.
How is a mixture different from a compound?
A mixture consists of substances that retain their own properties, while a compound has new properties different from its individual elements.
What is a mixture?
A mixture contains two or more substances that are not chemically bonded together.
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