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Answer:
The conversion of liquid water into gaseous water is a chemical change
Explanation:
A chemical change occurs when there is a chemical reaction, so there'll be changed in the compounds, such as forming new ones, forming its elements, or elements forming compounds.
A physical change occurs when there is a change in the state of aggregation of the compound, it means that it changes its physical state. Solid for liquid, liquid for solid, liquid for gas, gas for liquid, solid for gas, and gas for solid are the physical changes.
So the evaporation of water, or its conversion in gaseous water, is a physical change, not a chemical change.
He was testing an acid. So your answer will be C.
Hope this helps!
Answer:
A reactant is there at the start of a chemical reaction, whereas a product is there at the end of a chemical reaction.
I hope this helps!
Answer:
On the farm there are 70 chickens.
Explanation:
We can directly <u>work out the number of ducks from the given number of pigs</u>, with the <em>ratio of ducks to pigs</em>:
- 36 pigs *
= 20 ducks
Then we<u> work out the number of chickens</u>, using the ration of chickens to ducks:
- 20 ducks *
= 70 chickens
If on the farm there are 36 pigs, there are 70 chickens as well.
