Answer:
The sun
Explanation:
The sun is the primary source of energy in most living communities. The producers or the green plants that prepare their own food by the use of sunlight and other natural resources. Carbon dioxide, water, and other minerals are used by the plants to make their food in the presence of chlorophyll. Plants are then consumed by the consumers. This chain helps in forming the food chain and the food web.
Answer:
it gains 2 electrons
Explanation:
atoms want to be more stable, for oxygen it's number is 8, 2 less than the stable ring of 10. and hydrogen has a single electron, 1 less than the stable ring of 2. so oxygen takes 2 electrons 2 make it stable and hydrogen becomes attatched to the oxygen atom to form a covalent bond
Answer:
7.88 g/mL
Explanation:
In order to calculate the density we need the mass and the volume of the metal.
The mass is already given by the problem (256.0 g). As for the volume, we can calculate it using <em>Archimede's principle</em>: The volume of water the metal displaced is equal to the volume of the metal.
- Volume of Water displaced = 87.3 mL - 54.8 mL = 32.5 mL
Thus the volume of the metal is 32.5 mL.
- Finally we calculate the density:
- Density = mass / Volume = 256.0 g / 32.5 mL = 7.88 g/mL
It would be double replacement
