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chemical
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∙ 12y ago
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What kind of change occurs with a new substance being formed?
Chemical change.
Which type of change results in new compounds being formed?
Physical Change
A physical change is best defined as?
a process that does not change the chemical composition of a substance. A change in a substance with no new substances being formed
What kind of change occurs with no new substance being formed?
physical changes
What chemical reaction does not result in a new substance being formed?
phisical change
Why are metal alloys an example of a physical change and not a chemical change?
They are a physical change because it is not like burning where a new substance is being formed.
What are the Definitions of chemical and physical changes?
A physical change is a change in the physical state of a substance. An example of a physical change is water turning to ice (a solid) when frozen. Its state of matter has changed, but it is still the same substance (water).A chemical change is a change in the chemical structure of a substance(s). For example, when oxygen and magnesium react, they form magnesium oxide (a different substance). The chemical state of both the oxygen and magnesium atoms involved has changed.Equations:Oxygen + Magnesium --> Magnesium OxideO2 + 2Mg --> 2MgO
Is rust forming on an iron nail a chemical change?
Yes. Rust on anything is always a chemical a change because a new substance is being formed.
How is cutting a physical change?
Cutting iron is considered a physical change because there is not a new substance being formed. It is just changing the shape. It is still just iron.
What changes are evidence for a chemical change?
Remember that a chemical change is anything that alters the identity or composition of a substance. So something such as color change, a solid being formed, a gas being produced or temperature changing would constitute a chemical change.
Is water freezing an example of a different substance being formed?
No it is not!
Is expansion of iron a physical change?
Cutting iron is considered a physical change because there is not a new substance being formed. It is just changing the shape. It is still just iron.
