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3 years ago

Starting billions of years ago, in what way did algae change the atmosphere

Chemistry

1 answer:

ikadub [295]3 years ago

7 0

Answer:

Option (C)

Explanation:

In the primitive world, about billions of years back, the initially formed organisms such as algae, were responsible for the production of large amount of oxygen in the atmosphere. This was possible by these algae, as they were able to carry out the process of photosynthesis, where the food is synthesized in the presence of sunlight, water and carbon dioxide (CO₂), and in return, it generates food and oxygen, on which the organisms are dependent on.

Thus, these algae were responsible for the changes in the atmosphere, by converting carbon dioxide (CO₂) into oxygen.

So, the correct answer is option (C).

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Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide

Mice21 [21]

Answer:

Calcium bromide

Explanation:

When naming compounds, the use of prefixes depend on the type of bond made. In this case, calcium and bromine form a ionic bond because calcium is a metal and bromine is a non-metal.

Ionic bonds are not named using prefixes. So no matter how many atoms there are, you will simply write the name of the element for the first element.

For the second element, you name it as well, but only use the root name and end it with -ide.

7 0

3 years ago

The solubility of a salt in a given volume of water depends primarily on the A) surface area of the salt crystals B) temperature

Darina [25.2K]

Answer:

The correct answer to the following question will be Option B (temperature of the water).

Explanation:

The solubility of that same salt which appears whenever the substance is added in some kind of a fluid which already incorporates another origin of many of its atoms.
The solubility of such a substance throughout a given quantity of water is predominantly dependent on the whole of the water temperature.

7 0

3 years ago

Which order system shows the levels of organization from largest to smallest

Yanka [14]

Answer:

the answer is organism tissue organ system organ cell

7 0

3 years ago

Note the mass of copper(1) oxide formula unit 143.091 what is the mass of 8.250 moles of Cu2O

baherus [9]

Answer:

The mass of 8.250 moles of Cu2O is 1180.5g

Explanation:

HOW TO CALCULATE MASS OF A SUBSTANCE:

The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:

Mass (g) = no. of moles (mol) × molar mass (g/mol)

Molar mass of copper (I) oxide (Cu2O) = 63.5(2) + 16 = 143.09 g/mol

Mass of Cu2O = 8.250 mol × 143.09 g/mol

Mass of Cu2O = 1180.5 g

Therefore, the mass of 8.250 moles of Cu2O is 1180.5 g.

6 0

2 years ago

Make a list of 5 metals and 5 non metals and their real life application and any additional information about

svetoff [14.1K]

Answer:

Metals:

Copper: to make cooking utensils such as pots because it has a high heat conductivity.

Aluminium: to make aluminium foil / soda cans because it is malleable

Mercury: fills up thermometers because it can indicate the temperature when it expands. But it is toxic so fewer people are using mercury thermometers now.

Titanium: to make the body of supersonic aircrafts because it is strong and corrosion resistant

Gold: to make jewelry because it is shiny and also corrosion resistant

Non-metals:

Nitrogen: to fill up chip packages because its molecules are unreactive

Helium: to fill up balloons because it is lightweight

Hydrogen: for generating electricity in hydrogen fuel cells. It is environmentally-friendly because it does not produce any greenhouse gas or toxic pollutants.

Fluorine: added in toothpaste for strengthening the teeth. It can also prevent cavities.

Carbon: the graphite in pencils. this is one form of carbon. Other common forms (allotropes) of carbon include diamond and Buckminsterfullerene (buckyball).

6 0

3 years ago