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3 years ago

A student made the following observations about astronomical bodies.

Chemistry

2 answers:

Paul [167]3 years ago

7 0

Answer:

C. Both observation 1 and observation 2.

Explanation:

The heliocentric model states that the Earth and planets revolve around the Sun at the center of the Solar System.

Observation 1 was answered by Nicolas Copernicus, father of the heliocentrism, in 1543. The reverse effect is an illusion created because the Earth revolves faster around the Sun than Mars.

And observation 2 also is explained by the model because the rotation of the earth made that the Stars be closer to it at different times of the year.

I hope this answer helps you.

Lynna [10]3 years ago

7 0

I would say C. Stars would seem brighter as Earth moved nearer and the retrograde motion of Mars is due to Earth passing the planets.

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In reading a line drawing, how do you know where atoms of these elements are in the structure if they are missing from the drawi

Tanya [424]

Answer:

The atoms of an element are represented in a chemical line drawing with its chemical formula.

Explanation:

chemical structural drawing helps to represent the pattern for which an element is formed. Chemical elements are made up of atoms that represent their single state.

The line drawing is made up of lines (representing the chemical bond between atoms) and the atoms or various atoms that make up the element.

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3 years ago

Determine the molar mass of CuSO4×5H2O

asambeis [7]

248.72 g/mol

CuSO4 has a molar mass of 159.62. H2O has a molar mass of 18.02, which is multiplied by 5 to reflect the 5 H2O molecules.

159.62+5(18.02)=249.72 g/mol

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3 years ago

What are the products in a neutralization reaction A. Two elements B.an acid and a base C. An element and a compound D. A salt a

frez [133]

D. Salt and water

Explanation:

Acid + Alkali -> Salt + water

5 0

3 years ago

Read 2 more answers

Ketones undergo a reduction when treated with sodium borohydride, NaBH4. The product of the above reaction has the following spe

Anna71 [15]

Answer:

The product is cyclohexanol

Explanation:

Firstly,

A ketone undergo a borohydride reduction reaction to form an alcohol as below,

R-CO-R' ⇒ R-CO(OH)-R'

IR Spectrum confirms that alcohol group is existed with the peak at 3400 cm⁻¹
From 1H-NMR, the product has 10 hydrogen atoms, the MS suggest that the formula is C₅H₁₀O (M = 86). With this formula, the alcohol is monosaturated. Since, the substance already underwent reduction reaction, the only way to suggest a monosaturated compound is a cyclic alcohol. So the compound is cyclopentanol.
Check with other spectroscopic properties,

3 signals of 13C NMR confirms the structure is symmetrical, δ 24.2, (-CH₂-CH₂-CH(CH₂-)-OH), δ 35.5 (-CH₂-CH₂-CH(CH₂-)-OH), δ 73.3 (-CH₂-CH₂-CH(CH₂-)-OH).

1H NMR confirms,

1.56 δ (4H, triplet) - (-CH₂-CH₂-CH-OH) ; triplet as coupling with 2 H,

1.78 δ (4H, multiplet) - (-CH₂-CH₂-CH-OH); multiplet as coupling with 2H of CH₂, 1 H of CH

3.24 δ (1H, quintet); - (-CH₂-CH₂-CH(CH₂-)-OH), coupling with4 H of 2 group of CH₂

3.58 δ (1H, singlet); - (-CH₂-CH₂-CH(CH₂-)-OH), hydrogen of alcohol group, not tend to coupling with other hydrogen

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3 years ago

How much kilometers is in 6000m

lord [1]

Answer:

about 3 miles i think

Explanation:

3 0

3 years ago

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