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11 questions
Glucose (C6H12O6) and sucrose (C12H22O11) are both sugars produced by plants and consumed by animals for energy. Which best describes glucose and sucrose?
They are the same substance.
They are mixtures with the same chemical formula.
They are compounds made up of the same elements.
They have the same hydrogen to carbon ratio and form a crystalline structure.
Which is the best example of a pure substance?
peanuts
milk
gold
air
How can mixtures best be described?
made of one element
made of different elements that are all chemically bonded together
made of different elements that are not all chemically bonded together
made of substances that are chemically reactive.
Which does silicon dioxide (SiO2) represent?
element
compound
homogeneous mixture
heterogeneous mixture
Which best explains the difference between an element and a compound?
Elements cannot occur naturally, while compounds naturally occur.
Elements have specific properties, while compounds do not have specific properties.
Elements cannot be broken down, while compounds can because they join together in a specific pattern.
Elements can be broken down, while compounds cannot because they are composed of two or more mixtures.
When elements chemically combine, which best describes the resulting compound?
It has different ratios of atoms.
It has different types of matter.
It has the same properties as the uncombined elements.
It has different properties from the uncombined elements.
Which of the samples shown represents an element?
substance 1
substance 2
substance 3
substance 4
Water (H2O) and table salt (NaCl) can be combined to form salt water. How can this combination be classified?
as a compound because the water (H2O) and table salt (NaCl) are chemically combined
as a compound because the water (H2O) and table salt (NaCl) form a new pure substance
as a mixture because the water (H2O) can be evaporated and physically separated from the table salt (NaCl)
as a mixture because the water (H2O) is nonpolar and can be chemically separated from the table salt (NaCl).
A student studies four chemicals in a laboratory investigation.
Which chemical cannot be further broken down into other chemicals using ordinary laboratory processes?
1
2
3
4
Which is the best example of a heterogenous mixture?
sugar
brass
salad
salt water
Which is a homogeneous mixture?
pizza
kool-aid
soil
tossed salad
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