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Stella [2.4K]
3 years ago
8

What are two natural and two man-made causes for sudden catastrophic change to an ecosystem

Chemistry
1 answer:
malfutka [58]3 years ago
8 0

Answer:

Some changes that can occur in ecosystems are seasons, tide cycles, population sizes, succession, evolution, landscape changes, and climate changes.

Explanation:

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How did Niels Bohr describe electrons in his atomic model
Reptile [31]

Answer: Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus. 

so C would seems to be right.

Explanation: The energy of an electron depends on the size of the orbit and is lower for smaller orbits. Radiation can occur only when the electron jumps from one orbit to another. The atom will be completely stable in the state with the smallest orbit, since there is no orbit of lower energy into which the electron can jump.

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3 years ago
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HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of sol
dlinn [17]

Answer: below is the calculation for Ka

Explanation:

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3 years ago
Choose all the answers that apply. Which of the following has kinetic energy? rolling ball, moving car, book on a table, spinnin
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Spinning top, moving car, and rolling ball have kinetic energy I believe
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3 years ago
A chemistry student adds a quantity of an unknown solid compound X to 5.00 L of distilled water at 15.° C . After 10 minutes of
Yuliya22 [10]

Answer:

34 g/100 mL

Explanation:

The solubility of a compound can be expressed in g/100mL, for this we must divide the mass of the compound that dissolves in the solute by the volume of the solvent.

The solvent, in this case, is water, and that mass of the solute X that dissolved is the mass that was recovered after the solvent was drained and evaporated. So the solubility of X (S) is:

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S = 34 g/100 mL

8 0
3 years ago
Describe differences between conduction and convection give examples
nevsk [136]

Explanation:

Both conduction and convection are both forms of heat transfer from one place to another.

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Example of conduction is heating of iron pot when cooking

Example of convection is the refrigerating system.

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