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cestrela7 [59]
3 years ago
13

A ecosystem is ______ if it can continue to function over long periods of time

Chemistry
1 answer:
Alexandra [31]3 years ago
7 0
A ecosystem is SUSTAINABLE if it can continue to function over long periods of time.
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If you have 20.8 grams of zinc (Zn), how many moles of zinc do you have?
Nezavi [6.7K]

Answer:

If you have 20.8 grams of zinc, you would around 0.318 moles

Explanation:

1 mole of Zn is around 0.015295.

When you multiply 0.015295 and 20.8, you would get around 0.318 moles so:

1 mole Zn = 0.015295

20.8 × 0.015295 = 0.318

6 0
3 years ago
77 grams of an unknown metal at 99ᵒC is placed in 225 grams of water which is initially at 22ᵒC. The water is inside a 44 gram a
BigorU [14]

Answer:

The specific heat capacity of the unknown metal is C = 0.6991 J/g°C = 0.1671 cal/g°C

Explanation:

Heat lost by the unknown metal is equal to the heat gained by the water and aluminium cup.

Given,

Mass of unknown metal = 77 g

Initial Temperature of unknown metal = 99°C

Mass of water = 225 g

Initial Temperature of water = 22°C

Mass of Aluminium cup = 44 g

Specific heat capacity of Aluminium cup = 0.22 cal/gᵒC = 0.92048 J/g°C

Final temperature of the setup = 26°C

Note that, specific heat capacity of water = 4.186 J/g°C

Let the specific heat of the unknown metal be C

Heat lost from the unknown metal

= (77)(C)(99 - 26) = (5,621C) J

Heat gained by water

= (225)(4.186)(26 - 22) = 3,767.4 J

Heat gained by Aluminium cup

= (44)(0.92048)(26 - 22) = 162.00448 J

Heat lost by unknown metal = (Heat gained by water) + (Heat gained by Aluminium cup)

5621C = 3,767.4 + 162.00448 = 3,929.40448

5621C = 3,929.40448

C = (3,929.40448 ÷ 5621) = 0.6991 J/g°C

C = 0.6991 J/g°C = 0.1671 cal/g°C

Hope this Helps!!!

6 0
3 years ago
Read 2 more answers
How do you balance this chemical equation?
garik1379 [7]

Answer:

i will help hold up

Explanation:

what grade are you in

8 0
3 years ago
Give the major product formed when phenol is heated with concentrated H2SO4 and SO3. (There is more than one correct answer, but
iris [78.8K]

Answer:

See image attached and explanation

Explanation:

The reaction of phenol with SO3/H2SO4 is an electrophilic reaction. The electrophile attacks portions of high electron density in the substrate phenol.

The -OH group activates phenol towards electrophilic substitution at the ortho and para positions, hence the product(s) formed in this reaction(only one product is shown here as required by the question).

The sulphonation of phenol using concentrated sulfuric acid at lower temperature yields majorly the ortho product whereas at higher temperature the para product predominates.

4 0
3 years ago
The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is used to
Igoryamba

Answer:

Probably it was ment to illustrate how significant and indivisible, being very small, atoms are and how each of them under normal conditions of presure and temperature find their own place eventually

6 0
4 years ago
Read 2 more answers
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