Answer:
1, just I) color.
Explanation:
Physical properties are the properties that can be observed without changing the composition of a substance, such as color, temperature, density, and boiling point.
A physical change is a change in the substance that only modifies its aggregation state, such as solidification, and boiling.
Chemical properties are the properties that need a reaction to being observed, such as the combustibility, which needs a combustion reaction to being quantified.
When a chemical reaction occurs, and the composition of the substance change, it's a chemical change.
So, the heating copper with carbon is a chemical reaction, and purification by electrolysis is too. Color is the only physical property.
Answer:
The increase of prey
Explanation:
Without predators in the ecosysten prey population would increase
Answer:
126.4 g of
are required
Explanation:
Balanced reaction: 
According to balanced reaction-
8 moles of
are produced from 2 moles of 
So, 8.70 moles of
are produced from
moles of
or 2.175 moles of 
Molar mass of
= 58.12 g/mol
So, mass of
required =
= 126.4 g
Hence 126.4 g of
are required
If there is more soil, there would be more plants, and thus, more organisms, depending on if the soil has enough nutrients to support an ecosystem. The way that this would affect the climate is that it would transpire moisture into the atmosphere, and also generate fresher air through photosynthesis.