Answer:
The zebra mussel is found in freshwater lakes and rivers of the Balkans, Poland, and the former Soviet Union. It was first found in the United States in Lake St. Claire, off of the eastern shore of the state of Michigan.
Biologists think the zebra mussel was picked up in a freshwater European port in the ballast water of a ship, and was later released into the water on the Canadian side of Lake St. Clair. The zebra mussel was not intentionally transported into its new ecosystem.
The zebra mussel is small, free-swimming, and easily spread by water currents, and can attach to almost any hard surface.
The zebra mussel affects an ecosystem's food web both positively and negatively. The positive effects include serving as a food source to many native fish, birds, and other animals. The negative effects include interfering with other organisms' feeding, growth, movement, respiration, and reproduction.
Answer:
Explanation:
Hello,
In this case case, the Dalton's law is useful to compute the total pressure in terms of the partial pressure of the present gases:
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Answer:
The functional group
Explanation:
A functional group defines a hydrocarbon. an ester the functional group is an O- alkyl group while that one of an alcohol is -OH group. An aldehyde is a functional group on its own.
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Answer:</h3>
2.125 g
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Explanation:</h3>
We have;
- Mass of NaBr sample is 11.97 g
- % composition by mass of Na in the sample is 22.34%
We are required to determine the mass of 9.51 g of a NaBr sample.
- Based on the law of of constant composition, a given sample of a compound will always contain the sample percentage composition of a given element.
In this case,
- A sample of 11.97 g of NaBr contains 22.34% of Na by mass
A sample of 9.51 g of NaBr will also contain 22.345 of Na by mass
% composition of an element by mass = (Mass of element ÷ mass of the compound) × 100
Mass of the element = (% composition of an element × mass of the compound) ÷ 100
Therefore;
Mass of sodium = (22.34% × 9.51 g) ÷ 100
= 2.125 g
Thus, the mass of sodium in 9.51 g of NaBr is 2.125 g