both carbon dioxide and water are pure substances. how are they similar to each other?
A. Both substances have a set ratio of atoms that cannot be separated by physical means.
B. Both substances have a set ratio of atoms that can be separated by physical means.
C. Both substances have the same physical and chemical properties.
D. Both substances have the same physical properties, but different chemical properties.
Is it A?
MS SUE PLEASE HELP
1. A
2. A
3. D
4. D
5. B
6.C
7.B
8.A
9.B
10.B
11.C
12.D
13.B, C, and E
14.A
15.C
I think it's A as well.
thank you can u help me with some other questions
@Jazzzmin
Tysm!! Jazzzmin's answers are correct for the Connections Academy science practice test.
Yes, you are correct. The answer is A. Both carbon dioxide and water are pure substances because they have a definite chemical composition and cannot be separated into simpler substances by physical means.
Carbon dioxide (CO2) is a compound composed of one carbon atom bonded to two oxygen atoms. Similarly, water (H2O) is a compound composed of two hydrogen atoms bonded to one oxygen atom. These compounds have a fixed ratio of atoms, which means that the number of atoms in each molecule is always the same.
In contrast, option B is incorrect because pure substances cannot be separated into simpler substances by physical means. For example, if you have a sample of water, it cannot be separated into its constituent elements (hydrogen and oxygen) through physical methods like filtration or distillation.
Option C is also incorrect because carbon dioxide and water have different chemical properties. Carbon dioxide is a gas at standard temperature and pressure, while water is a liquid. They also have different boiling points, melting points, and chemical reactions.
Option D is incorrect because carbon dioxide and water have different chemical properties as explained above. However, they do share some similar physical properties, such as being transparent and odorless.