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MArishka [77]
3 years ago
15

4. Which of these metals is a pure element? Brass Bronze Silver Steel 5. C is the correct chemical symbol for ....... Calcium Ca

rbon Chlorine Cobalt 6. Which of these substances is an element? Air Fire Oxygen Water
Chemistry
2 answers:
pickupchik [31]3 years ago
5 0

Answer:

4) Silver (Rest are alloys)

5) Carbon (It stands for C)

6) Oxygen (Rest of them are either compounds or mixtures)

Gala2k [10]3 years ago
3 0

Answer:

4) Silver

5) Carbon

6) Oxygen

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Explanation:

The Gabriel synthesis is a chemical reaction that transforms primary alkyl halides into primary amines. Traditionally, the reaction uses potassium phthalimide. ... The alkylation of ammonia is often an unselective and inefficient route to amines. In the Gabriel method, phthalimide anion is employed as a surrogate of H2N−.

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2 years ago
Changes in the composition of the atmosphere have caused gradual changes in earth's _______ throughout history, causing changes
bearhunter [10]

climate

Changes in the composition of the atmosphere have caused gradual changes in earth's <u>climate</u> throughout history, causing changes in plant and animal life that contributed to mass extinctions.

The following are some of the reasons:

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  • pollutants
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heat

  • The surface of the Earth warms up as sunlight strikes it.
  • Surface-emitted infrared light is absorbed in the atmosphere and transformed into heat.
  • The temperature close to the surface rises as a result of this heat being trapped in the atmosphere.
<h3>UV light:</h3>
  • indirect impacts of climate change on UV radiation from the surface.
  • By changing the concentrations of ozone, UV-absorbing tropospheric gases, aerosols, and clouds in the atmosphere, climate change may have indirectly affected UV radiation levels in the past.
  • These influences are probably going to persist in the future.
<h3>climate:</h3>
  • People are at risk from food and water shortages, greater flooding, high heat, an increase in disease, and economic loss due to climate change.
  • Conflict and human migration are potential outcomes.
  • Climate change is the top hazard to world health in the twenty-first century, according to the World Health Organization (WHO).
<h3>pollutants:</h3>
  • these are also resulting in the increase of temperature of the Earth and is also damaging ozone layer.

To learn more about the changes in earth visit:

brainly.com/question/13434833?

#SPJ4

6 0
11 months ago
Ionic character of lih
adoni [48]
I believe LiH becomes HF 
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3 years ago
Which term is used to describe the variety of inheritable traits in a species? (4 points)
Nookie1986 [14]

Answer:

B Genetic diversity

Explanation:

6 0
2 years ago
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D.) There are 24 atoms in total in that compound.....
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3 years ago
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