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3 years ago

Help please! due in an hour.

Chemistry

2 answers:

cestrela7 [59]3 years ago

5 0

Answer:

Asteroid- Made of rock and/or metal. Orbits between Mars and Jupiter.

Comet- Made of ice, dust, and gas. Appears as a streak in the sky. Orbits the sun. Often called a "shooting star".

Meteor- Sometimes called a "dirty shadow". Most are found in the Outer Belt or Kuper Belt.

I hope this helps and is correct. :)

zalisa [80]3 years ago

4 0

Answer:

can you post another photo i do not see well

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Fossil fuels are the energy source that form over ______ as a result of the ______ and partial ______ of plants and other organi

netineya [11]

Answer:

Blank 1: million of years

Blank 2: compression

Blank 3: decomposition

Explanation:

Fossil fuels are mixtures of substances that can be burne to obtain energy like coal, petroleum and natural gas.

They are formed by organic matter, mainly carbon and hydrogen, along with other elements.

The theory with the most consensus on the formation of fossil fuels is that they formed after organic matter, plants and animals, died and were buried under a huge mass of sediments.

The huge pressures, in the absence of oxygen, yield the decomposition of the organic matter to form the fossil fuels.

Due to the fossil fuels require million of years to be formed they are considered nonrenewable energy resources, as they cannot possible be formed in a reasonable time on human life scale.

7 0

3 years ago

Convert 8.9 miles (mi) to inches (in). 1 mi = 5,280 feet (ft); 1 ft = 12 in

Minchanka [31]

Answer:One mile is also equal to 5,280 feet or 1,760 yards. The mile is a US customary and imperial unit of length. Miles can be abbreviated as mi, and are also sometimes abbreviated as m. For example, 1 mile can be written as 1 mi or 1 m. Inches. An inch is a unit of linear length measure equal to 1 / 12 of a foot or 1 / 36 of a yard.

Explanation:

5 0

3 years ago

As an SN2 solvent for reactions like the alkylation of acetaminophen, water would be a polar selection. Water is more polar that

evablogger [386]

Answer: polar protic solvents solvate the nucleophile necessary for attack on the substrate in SN2 substitution.

Explanation:

Aprotic solvents are solvents that lack protons such as dimethyl sulphoxide (DMSO). DMSO has no exposed positive end. The positive end is buried inside the molecular structure. As a result of this, the nucleophile is not solvated. If the nucleophile is solvated, the rate of SN2 reaction will reduce drastically because the nucleophile becomes unavailable to attack the substrate. This solvation normally occur in polar protic solvents such as water because of the exposed positive end of the molecule which interacts with the nucleophile thereby reducing the rate of SN2 reaction.

4 0

3 years ago

The number of moles of solute in 200.ml of a 0.500 m solution is

IrinaK [193]

Answer:

I believe the answer is 0.100.

Explanation:

Hope my answer has helped you!

8 0

3 years ago

Assume that concentrated aqueous NH3 has a density of 0.252 g/mL (0.252 g of NH3 per mL of liquid). Calculate the volume of NH3

Kobotan [32]

The question is incomplete, here is the complete question:

Assume that concentrated aqueous NH₃ has a density of 0.252 g/mL (0.252 g of NH₃ per mL of liquid). Calculate the volume of NH₃ required to contain 0.442 mol?

Answer: The volume of ammonia required is 29.82 mL

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$