The answer is D, alters the test variable, and observes the effects on other outcome variables.
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Answer:</h3>
B. The object moves some distance
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Explanation:</h3>
- Work is the product of force and distance.
- Work is done on an object when a force is applied on the object making it move some distance.
- For example; If a mason applies a force of 5 N to move a stone at a distance of 10 m, then the work done will be 50 Joules.
- Applying a force on an object without making it move some distance then there is no work done.
- Consider a boy pushing a wall really hard and the wall doesn't move even for a single inch, this means there is no work done.
Answer:
Single Displacement Reaction: a reaction in which an element is swapped for another in a molecule
A + BC ---> AC + B
Double Displacement Reaction: a reaction in which the cation of one molecule is swapped with a cation of another molecule
AB + CD ---> AD + CB
a) Single Displacement Reaction
3 Ca + 2 AlBr₃ ----> 3 CaBr₂ + 2 Al
b) Single Displacement Reaction
2 Al + 3 MgSO₄ ----> Al₂(SO₄)₃ + 3 Mg
c) Double Displacement Reaction
AgNO₃ + KCl ----> AgCl + KNO₃
Answer:
It releases nutrients which causes rapid growth of planktons which leads to oxygen deficiency leading to death of aquatic animals,a phenomenon known as eutrophication.
Explanation: