D, Render aid and assistance. I learned this in my government/public administration class. If they don't they can be sued, and lose their job. It also slightly follows the 'Good Samaritan' law, but not fully.
Answer:
the third one i do belive
Explanation:
Answer:
The correct answer is - B. dissolving → evaporation filtration → crystallisation
Explanation:
The method of the preparation of a pure sample of copper(II) sulfate from dilute sulfuric acid and copper II oxide is given as follows:
step 1. Adding dilute sulfuric acid into a beaker. Using bunsen burner heat the beaker.
step 2. Adding the copper (II) oxide into the beaker and give it a little time at a time to the warm dilute sulfuric acid and stir
step 3. Filtering the mixture into an evaporating vessel to remove the excess copper (II) oxide and water from the filtrate.
Step 4. leave the rest filtrate to crystallize.
Copper (II) Oxide {CuO (s)} + Dilute Sulfuric Acid {H2SO4 (aq)} → Copper (II) Sulphate {CuSO4 (s)} + Water {H2O}
Molecules move from areas of low concentration to areas of high concentration. This requires the use of energy.
The environmental conditions of the ocean are:
- Light availability
- Oxygen levels
- Water movement
- Salinity
- Density and
- pH.
<h3>What are the environmental impacts on the ocean?</h3>
In our oceans, there are known to be a lot of environmental conditions that are known to often affect the growth, survival and also the productivity of marine organisms. These are the ones listed above.
Note that the increased concentration of chemicals, e.g. nitrogen and phosphorus is one that can be harmful to marine life.
Hence, The environmental conditions of the ocean are:
- Light availability
- Oxygen levels
- Water movement
- Salinity
- Density and
- pH.
Learn more about ocean from
brainly.com/question/25154137
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