Which of the following substances would best be measured using mole quantities?

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Kipish [7]

Step 3

Explanation:

Step 3 contains a major error.

In step 3, it is stated as molten rocks are heated.

Molten rocks are not heated.

Solid rocks are heated as the plate is pushed down under the earth due to movement of tectonic plates.

When the rock is heated, the rock is melted to become molten.

The molten rock is called magma.
When the magma cools, it solidifies to form igneous rocks.

A molten rock is not heated to form igneous rocks.

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Volcanic eruptions brainly.com/question/5055821

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7 0

3 years ago

Imagine disease kills 85 percent of the wolf population. How will it affect the other organisms?

stealth61 [152]

Answer:

There would most likely be an overpopulation of the animals the wolfs ate.

Explanation:

7 0

3 years ago

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Octane has a density of 0.692 g/ml at 20oc. how many grams of o2 are required to burn 15.0 gal of c8h18 (the average capacity of

Hatshy [7]

Octane has a density of 0.692 g/ml at 20°C. Grams of O₂ required to burn 15.0 gal of C₈H₁₈ is 1.37868×10⁵g.

Octane is a hydrocarbon having eight carbon atoms and have single bonds only.

Given,

Density of octane = 0.692g/ml

Temperature = 20°C = 293K

Amount of Octane present = 15gal

Molar mass of octane = 114g

We know that,

1 gal = 3.78541L = 3785.4ml

Hence, 15 gal = 56781 ml

Now let's calculate the Mass of octane required:

Mass of octane = 0.692 x 56781

Mass of octane = 39292.45 g

According to the given equation,

C₈H₁₈ + 12.5O₂ ---------> 8CO₂ + 9H₂O

Also, 114g of octane needs-------> 400g of oxygen

39292.45g of octane needs ---------> 137868.24g of oxygen

Hence, oxygen needed to burn octane is 1.37868×10⁵g

Learn more about Octane here, brainly.com/question/21268869

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4 0

2 years ago

What are some examples of rapid changes

SSSSS [86.1K]

1) color change - for example, when bleach is shot down by mistake, in colored clothing;

2) gas release - for example, when playing an effervescent tablet in water.

3) heat release - for example in combustion;

hope this helps!.

7 0

3 years ago

Explain how a long-term environmental change can lead

GalinKa [24]

Answer:

Humans are modifying the world in many ways, and not all of them for the better. The changes we cause are often severe challenges to animals, plants and microbes in nature, from the introduction of pathogens or exotic invasive species to adding toxic substance or excessive nutrients, or causing climatic change. Often several changes occur at once. Nelson Hairston's lab focuses on freshwater environments, especially lakes and ponds, where some of the species present respond to environmental change with decreases in their numbers, even to the point of extinction, while others may benefit to excess, becoming so dominant that they present problems, as in the case of harmful algal blooms stimulated by nutrient enrichment or climate warming. Hairston's lab studies how individual species, food webs, and whole ecosystems are altered when the environment changes.

One way that some freshwater organisms respond to environmental change is to evolve rapidly. A marked change in the environment favors some characteristics of plants, animals and microbes over others. These character differences are often genetically based so that favored characteristics may increase in the next generation. The shorter the generation time, the faster this evolutionary change can occur. For example, tiny but abundant plankton, eaten by fish and other larger animals, can become adapted to the changed environment within a few years because their generation time is only a few days. Hairston's lab has shown that planktonic "water fleas" (Daphnia), major consumers of suspended algae in lakes, evolved to be tolerant of harmful algae within a decade of the appearance of blooms. This rapid evolution (termed "evolutionary rescue" in conservation biology) raises many intriguing questions, for all environments, not just freshwater: To what extent can we rely on species adapting rather than going extinct when their environment changes? How does the evolution of a species that plays a critical ecological role alter the interactions it has with other species, and the functioning of the entire ecosystem?

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3 years ago

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