CHEMISTRY HIGH SCHOOL

Why do goldfish in a crowded bowl have a better chance of survival in cold water than in warm water

Answers

Answer 1
Answer:

Due to high amount of dissolved oxygen in cold water, goldfish have a better chance of survival.

what is dissolved oxygen?

Dissolved oxygen is the amount of oxygen that is present in the water bodies.

As dissolved oxygen is very much important for the aquatic animals because their survival depends on the water. When we increases the temperature of water then the amount of dissolved oxygen decreases which cuts off the supply of oxygen to the aquatic animals. That's why every aquatic specie has a better chance of survival in the cold water, due to presence of the abundant dissolved oxygen.

Hence, goldfish has a better survival in cold water because of dissolved oxygen.

To learn more about dissolved oxygen, visit below link:

brainly.com/question/26073928
Answer 2
Answer: Gases are less soluble in warm water, which means that the oxygen leaves the water and the fish dies. Cold water keeps oxygen in for longer.

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During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. Which of the following scenarios would his students most likely observe?

Answers

The correct answer for the question that is being presented above is this one: "A test tube becomes cool to the touch." During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. The student will most likely observed that the test tube becomes cool to the touch.

Answer:

these are the choices

Explanation:

1 A test tube becomes cool to the touch.

2 A liquid appears to glow.

3 A new odor comes from a beaker.

4 A solid forms from a mixture of solutions.

Concentrated nitric acid used in laboratory is 68 % nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL-1?

Answers

68% by mass = 68 / 100 => 0.68

Density = 1.504 g/mL⁻¹

Molar mass HNO₃ =63.01 g/mol

M = 1000 * T* D / mm

M = 1000 * 0.68 * 1.504 / 63.01

M = 1022.72 / 63.01

M = 16.23 mol/L

hope this helps!

A salt is best described as a compound that is formed from the reaction between

Answers

mical Compound

In chemistry, a salt is an ionic compound that results from the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral.

Answer:

A

An acid and a base

Explanation:

Using less water is one way to practice watera. filtration.
b. distribution.
c. conservation.
d. irrigation.

Answers

Answer: Option (c) is the correct answer.

Explanation:

When we avoid wastage of water or overuse of then then it is known as conservation of water.

For example, turning off tap when bucket placed below it is filled with water means avoiding wastage of water.

Whereas over flow of water from the bucket is wastage of water.

Thus, we can conclude that using less water is one way to practice water conservation.
Using less water is one way to practice c. conservation. That would come in handy for a drought :D. Hope this helps and have a good day!

Which of the following cannot pass across the placenta?(a) oxygen
(b) waste materials
(c) blood
(d) nutrients

Answers

The placenta is the structure that allows for transfer of wastes, oxygen, and
nutrients between the mother and the fetus.  The fetal blood comes extremely
close to the maternal blood in the placenta, but there is no intermingling of fetal
and maternal blood.  The fetus and mother can even have, and often do have,
different blood types.
Oxygen cannot pass through the placenta

Which structural formula represents 1,1 dibromopropane

Answers

The structural formula of 1, 1 dibromo propane is C₃H₆Br₂.

What is dibromopropane?

It is an organobromine compound. It is a colorless liquid. It is fpmed by the reaction of allyl bromide and hydrogen bromide.

It is used in organic synthesis of compounds.

Thus, the structural formula of 1, 1 dibromo propane is C₃H₆Br₂.

Learn more about dibromopropane

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CHBr2-CH2-CH3 Both bromide groups on the same carbon
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A student investigated the rate of reaction between sodium thiosulphate and dilute hydrochloric acid the student placed a conical flask over a cross on a piece of paperthe student mixed the solutions in the flask the solution went cloudy the student timed how long it took until the cross could not be seenthe equation for the reaction is :Na2 S2O3(aq) + 2HCl(aq) = 2NaCl(aq) + H2O(l) + SO2(g) + S(s)explain why the solution goes cloudy