Which of the following is considered acidic?(1 point)
Responses
Vinegar
Vinegar
Lime Water
Lime Water
Soap
Soap
Ammonia
Vinegar
The option that is considered acidic is vinegar.
The chemical formula for carbonic acid is H2CO3
. How many compounds are represented by this formula?(1 point)
Responses
2
2
3
3
6
6
1
1
To determine which of the following options is considered acidic, you can use pH as a measure.
pH is a scale that measures the acidity or alkalinity of a substance. It ranges from 0 to 14, with 7 being neutral. Substances with a pH value less than 7 are considered acidic, while those with a pH value greater than 7 are considered alkaline or basic.
Now let's look at the options:
1. Vinegar: Vinegar is commonly used in cooking and cleaning, and it has a pH value of around 2-3, indicating that it is acidic.
2. Lime Water: Lime water is a mixture of water and lime (calcium hydroxide). Lime water has a pH value of around 12-13, which is highly alkaline, or basic, not acidic.
3. Soap: Soap is typically alkaline in nature, with a pH value of around 9-10, so it is not acidic.
4. Ammonia: Ammonia is a colorless gas with a pungent odor. It has a pH value of around 11-12, making it alkaline, not acidic.
Based on this information, the only option that is considered acidic is Vinegar.
A student cuts some fabric into two pieces. Is this change physical or chemical?(1 point)
Responses
It is a physical change because there is no reaction.
It is a physical change because there is no reaction.
It is a physical change because the process is reversible.
It is a physical change because the process is reversible.
It is a chemical change because the size changes.
It is a chemical change because the size changes.
It is a chemical change because there is no phase change.