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3 years ago

A pure substance has a/an _______ composition.

Biology

2 answers:

horrorfan [7]3 years ago

6 0

Answer:

1. A pure substance has a definite constant composition.

2. A compound is composed of two or more types of matter that can be present in varying amounts.

3. A solution is a homogeneous mixture.

4. A mixture that is not uniform throughout is a Heterogeneous mixture

5. A pure substance that cannot be broken down chemically is a element.

6. A characteristic of matter that’s not associated with a change in its chemical composition is known as a physical property.

7. Wax melting is an example of a physical change in the state of matter.

8. A banana peel turning brown is an example of a chemical change in the state of matter.

Degger [83]3 years ago

3 0

Answer:

constant

mixture

homogeneous

heterogeneous

element

physical

chemical

Explanation:

A good answer should contain the following:

got this from penn foster

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4. What is an example of positive feedback?

Shtirlitz [24]

Answer:

Explanation:

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3 years ago

Explain the types of acid deposition

Pepsi [2]

Answer:

Acid deposition-usually referred to simply as acid rain-actually includes two forms of pollution, wet and dry. ... In the wet type of acid deposition, these compounds combine with water vapor in the atmosphere to form highly corrosive sulfuric and nitric acids.

Explanation:

The accumulation of acids or acidic compounds on the surface of the Earth, in lakes or streams, or on objects or vegetation near the Earth's surface, as a result of their separation from the atmosphere. Acid deposition can harm the environment in a variety of ways, as by causing the acidification of lakes and streams, the leaching of minerals and other nutrients from soil, and the inhibition of nitrogen fixation and photosynthesis in plants.♦ The accumulation of acids that fall to the Earth dissolved in water is known as wet deposition. Wet deposition includes all forms of acid precipitation such as acid rain, snow, and fog.♦ The accumulation of acidic particles that settle out of the atmosphere or of acidic gases that are absorbed by plant tissues or other surfaces is known as dry deposition.

7 0

3 years ago

Read 2 more answers

C. At what height would the pomegranate have the same potential energy as the melon? (1 point)

zvonat [6]

Answer:

Given a set of assumptions which are given below, the height at which the pomegranate will have the same potential energy as the melon is 39.19 meters.

Explanation:

Gravitational Potential Energy refers to the acquired innate energy of an object due to its elevation above the surface of the earth.

This energy is the result of gravitational pull or force acting on the object.

In other to determine at what height a pomegranate and a watermelon will have the same potential energy we need to know the other factors in play.

Gravitational Potential Energy (Ep)= mgh

Where m = Mass (kg)

g = gravitational field strength (N/kg)

h = height (m)

Ep = gravitational potential energy ( j )

Let us assume that the

An average pomegranate weighs about 0.255146Kg

An average melon weighs about 10Kg
g is always constant at 9.8 N/kg

Note that melons weight much more than pomegranates.

So, let's calculate for the Ep of the melon at the height of 1 meter

Ep = 10 x 9.8 X 1 = 98j

Using the above assumptions, we do a goal seek using Microsoft Excel. Please see the attached image.

Calculation shows that the Height (h/Meters) at which the Ep of both veggies become equal is 39.19m

This can be verified by inserting the figure and multiplying it. It can also be calculated as follows:

That is

Ep = 98j

m = 0.255146kg

g= 9.8kg

h= ?

98= 0.255146 x 9.8 x h

98 = 2.5004308h (we divide both sides by 2.5004308 to make h the subject matter)

h = 98 / 2.5004308

h = 39.1932462198

Which is approximately 39.19

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2 years ago

How frequently can scientists prove that their hypotheses are true?

ZanzabumX [31]

Scientists prove their hypothesis is true about Scientists can never "prove" their hypotheses are true, because some future experiment, possibly using new technology not currently available, might show the hypothesis to be false after all.

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3 years ago

Where do the birds in the above food web get the matter needed to make beta-keratin?

vazorg [7]

From the insects and the worms they eat.

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2 years ago