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Phantasy [73]
3 years ago
7

Theory states that the extraterrestrial forces that have influenced climate rhythms over the last two million years have occurre

d primarily because of cyclical changes in Earth’s orbit around the Sun. Identify which statement is true. A) Every 41,000 years, the tilt of Earth’s spin axis oscillates between 17.5° and 19.5°. B) Every 41,000 years, the tilt of Earth’s spin axis oscillates between 19.5° and 21.5°. C) Every 41,000 years, the tilt of Earth’s spin axis oscillates between 21.5° and 24.5°. D) Every 41,000 years, the tilt of Earth’s spin axis oscillates exactly 21.5°.
Chemistry
2 answers:
Aleonysh [2.5K]3 years ago
4 0

I just had this question the answer is c

uranmaximum [27]3 years ago
3 0

Answer:

Option (C)

Explanation:

The earth's orbit has directly affected the earth's climate over the last 2 million years as it changes over a due course of time which is caused due to the extraterrestrial forces.

The tilt of the earth's imaginary rotating axis is about 23.5° and it keeps on fluctuating in a range between 21.5°  and 24.5°, which takes place over a time period of 41,000 years. This forms a part of the Milankovitch cycle, which led to the experiencing of the episodic ice age on earth.

Thus, the correct answer is option (C).

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4. Synthesis problems. Propose a synthetic route from the starting material to the product. In your answer, show each individual
Troyanec [42]

The reduction of alkyne to an alkene in the first step allows the best reagent to be chosen for each subsequent step.

Describe reagents.

A reagent is merely an essential component of a chemical reaction, it should be mentioned. It is an ingredient that speeds up the reaction.

With H2 and Lindlar's catalyst, an alkyne is reduced to alkene as the initial step in this process. Alkene will then be brominated to produce allyl bromide as the next step.

In this instance, the required allyl alcohol will be produced via the reaction of allyl bromide with NaOH.

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5 0
2 years ago
What salt is produced in each of the following neutralization reactions? HNO3(aq)+KOH(aq)→H2O(l)+? HNO3(aq)+Ca(OH)2(aq)→H2O(l)+?
Igoryamba

Answer:

1. KNO3

2. Ca(NO3)2

3. CaCl2

4. KCl

Explanation:

In each of the neutralization reactions, the H from one of the reactant(acid) will combine with the OH from the other reactant (base) to form water while the other elements combine to give the salt as shown below:

1. HNO3 + KOH → H2O + KNO3

The salt produced is KNO3

2. 2HNO3 + Ca(OH)2 → 2H2O + Ca(NO3)2

The salt produced is Ca(NO3)2

3. 2HCl +Ca(OH)2 → 2H2O + CaCl2

The salt produced is CaCl2

4. HCl +KOH → H2O + KCl

The salt produced is KCl

5 0
3 years ago
In 1994, the trade deficit was over 150 billion dollars. True or False?
erastova [34]
<span>The statement is true. Amid the Clinton organization, the administration closed down while Congress and the President consulted over how to diminish the national deficiencies. The spending shortage is the distinction between the cash government takes in, called receipts, and what it spends, called expenses every year.</span>
6 0
3 years ago
Read 2 more answers
2k+Cl2=2KCI how many grams of KCl is produced from 8.50 g of K and excess Cl2
ZanzabumX [31]

Answer:

Mass = 16.4 g

Explanation:

Given data:

Mass of K = 8.50 g

Mass of KCl produced = ?

Solution:

Chemical equation:

2K + Cl₂     →    2KCl

Number of moles of K:

Number of moles = mass/ molar mass

Number of moles = 8.50 g/ 39 g/mol

Number of moles = 0.22 mol

Now we will compare the moles of potassium and potassium chloride.

                  K         :        KCl

                  2         :          2

                0.22      :        0.22

Mass  of KCl:

Mass = number of moles × molar mass

Mass = 0.22 mol × 74.55 g/mol

Mass = 16.4 g

4 0
3 years ago
If 10.5-g of Na2SO4 are actually recovered experimentally, that is the percent yield?
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</span>
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3 years ago
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