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omeli [17]
3 years ago
12

Select all that apply. According to scientists, the distribution of volcanoes throughout the world… Is fairly even and widesprea

d Forms a specific pattern across fault lines Corresponds to plate boundaries Is constantly changing and shifting
Chemistry
2 answers:
boyakko [2]3 years ago
8 0
Hi there!

According to scientists, the distribution of volcanoes throughout the world corresponds to plate boundaries. 
Also called "divergent boundaries", plate boundaries have many volcanoes. These volcanoes and volcanic eruptions are caused by the movement of plates, which causes lava and magma to seep in the gaps of the plates. 

Hope this helps!
Ipatiy [6.2K]3 years ago
7 0
Only answers C and D would make sense in this question. Hope I helped please give brainiest!
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Give an example of a predator-prey relationship. Then, identify the predator and prey.
tangare [24]
One example of a predator prey relationship would be a a shark and a fish. The shark is the predator and the fish is the prey. The predator hunts for the prey.
7 0
3 years ago
Read 2 more answers
Chromium is dissolved in sulfuric acid according to the following equation: Cr + H2SO4 ⇒ Cr2 (SO4) 3 + H2
Usimov [2.4K]

Answer:

\large \boxed{\text{a)188.4 g; b) 98.67 $\, \%$}}

Explanation:

We will need a balanced chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:                      98.08           392.18

             2Cr + 3H₂SO₄ ⟶ Cr₂(SO₄)₃ + 3H₂

To solve the stoichiometry problem, you must

  • Use the molar mass of H₂SO₄ to convert  the mass of H₂SO₄ to moles of H₂SO₄
  • Use the molar ratio to convert moles of H₂SO₄ to moles of Cr₂(SO₄)₃
  • Use the molar mass of Cr₂(SO₄)₃ to convert moles of Cr₂(SO₄)₃ to mass of Cr₂(SO₄)₃

a) Mass of Cr₂(SO₄)₃

(i) Mass of pure H₂SO₄

\text{Mass of pure} = \text{165 g impure} \times \dfrac{\text{85.67 g pure} }{\text{100 g impure}} = \text{141.36 g pure}

(ii) Moles of H₂SO₄

\text{Moles of H$_{2}$SO}_{4} = \text{141.36 g H$_{2}$SO}_{4} \times \dfrac{\text{1 mol H$_{2}$SO}_{4}}{\text{98.08 g H$_{2}$SO}_{4}} = \text{1.441 mol H$_{2}$SO}_{4}

(iii) Moles of Cr₂(SO₄)₃

The molar ratio is 1 mol Cr₂(SO₄)₃:3 mol H₂SO₄ \text{Moles of Cr$_{2}$(SO$_{4}$)}_{3} = \text{1.441 mol H$_{2}$SO}_{4} \times \dfrac{\text{1 mol Cr$_{2}$(SO$_{4}$)}_{3}}{\text{3 mol H$_{2}$SO}_{4}} = \text{0.4804 mol Cr$_{2}$(SO$_{4}$)}_{3}

(iv) Mass of Cr₂(SO₄)₃ \text{Mass of Cr$_{2}$(SO$_{4}$)}_{3} = \text{0.4804 mol Cr$_{2}$(SO$_{4}$)}_{3} \times \dfrac{\text{392.18 g Cr$_{2}$(SO$_{4}$)}_{3}}{\text{1 mol Cr$_{2}$(SO$_{4}$)}_{3}} = \textbf{188.4 g Cr$_{2}$(SO$_{4}$)}_{3}\\\text{The mass of Cr$_{2}$(SO$_{4}$)$_{3}$ formed is $\large \boxed{\textbf{188.4 g}}$}

b) Percentage yield

It is impossible to get a yield of 485.9 g. I will assume you meant 185.9 g.

\text{Percentage yield} = \dfrac{\text{Actual yield}}{\text{Theoretical yield}} \times 100 \, \% = \dfrac{\text{185.9 g}}{\text{188.4 g}} \times 100 \, \% = \mathbf{98.67 \, \%}\\\\\text{The percentage yield is $\large \boxed{\mathbf{98.67 \, \%}}$}

7 0
4 years ago
HELP!!!!!!!!! 40 pointsss
stiv31 [10]
<h3>Answer:</h3>

Too many caterpillars 1) Plants would become scarce and rabbits would die out from starvation.

Hawks and snakes are scarce  2) Rabbit and bird populations would grow, making plants and caterpillars scarce.

Too many rabbits  3) Plants would become scarce and caterpillars would die out from starvation.

Sunlight is scarce  4) Plants would not grow, which would starve caterpillars and rabbits, which would then starve the other animals.

Too many snakes 5) Rabbit and birds become scarce.

Birds are scarce 6) Snakes would only eat rabbits, making rabbits scarce.

<h3>Explanation:</h3>

Too many caterpillars  1) Plants would become scarce and rabbits would die out from starvation.

Plants are the sole food source of both caterpillars and rabbits. Therefore, they are both competing for the same source of food. If there are too many caterpillars, then they will eat more of the plants. This would mean the plants are scarce. As a result, the rabbits now have less food and would die from starvation.

Hawks and snakes are scarce  2) Rabbit and bird populations would grow, making plants and caterpillars scarce.

Hawks and snakes are the two top predators in this food web. They both eat rabbits and birds. If their numbers declined, it would mean there would be no predators that eat rabbits and birds. As a result, the numbers of rabbits and birds would increase. This would have a knock on effect to both plants and caterpillar. Rabbits eat plants, and birds eat caterpillar. If there are more rabbits and birds, then they eat more plants and caterpillar, reducing their numbers and making them scarce.

Too many rabbits  3) Plants would become scarce and caterpillars would die out from starvation.

Rabbits rely on plants as their only food source. Caterpillars also rely on plants as their only food source. If there were too many rabbits, they would eat a lot of plants until the point they became scarce. Since caterpillars also rely on plants as their only food source, they would die of starvation.

Sunlight is scarce : 4) Plants would not grow, which would starve caterpillars and rabbits, which would then starve the other animals.

Plants rely on sunlight to make their own food by photosynthesis. If there is no sunlight, the plants cannot efficiently make food to grow and reproduce. Therefore, plants would become scarce. Plants are the food source of both rabbits and caterpillars. Therefore, if there were a limited number of plants, rabbits and caterpillars would not have sufficient food, and would die of starvation. Rabbits and caterpillars are the food source of birds,  snakes, and hawks, so these animals would also be affected.

Too many snakes: 5) Rabbit and birds become scarce.

Snakes are a top predator that eat rabbits and birds. If there are too many snakes, then they will need to eat more rabbits and birds to attain a sufficient food supply. Therefore, if there are lots of snakes, the numbers of rabbits and birds will reduce and eventually become scarce.

Birds are scarce: 6) Snakes would only eat rabbits, making rabbits scarce

Snakes have two food sources in this web: rabbits and birds. If birds became reduced in numbers, then snakes would only have one food source, rabbits. This would mean that rabbits would be eaten much more by snakes, as this is is their only food source. As a result, rabbit numbers would decline and become scarce.

8 0
3 years ago
What is the main reason metals such as silver and copper are used in making coins
Tanya [424]

Answer:

The alloys used to make coins are usually Copper, Zinc and Nickel. There are several reasons: The alloy must be very hard to withstand the use and circulation of the coin to not wear out soon. Then, the alloy must have a value less than the value of the currency to avoid that are founded and sold as mere metals.

Explanation:

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4 years ago
Biologists designed an experiment to test the effect of compost on the development of root crops. They tested several different
mars1129 [50]

Answer:

it is 56

Explanation:

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