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Slav-nsk [51]
4 years ago
10

What fact do scientists believe provides evidence for the big bang theory?a. all comets follow elliptical orbits.b. most extra-s

olar planets are gas giants.c. all stars feature nuclear fusion in their core.d. all distant galaxies are moving away from us. apex?
Chemistry
2 answers:
SVEN [57.7K]4 years ago
6 0

Answer:

D

Explanation:

This is because it is believed that the galaxy was once crammed into a tiny spot and the Big Bang explosion sent the universe expanding and galaxies hurtling way into space away from each other. The force from the Big Bang that is believed to cause this expansion is dark energy.

salantis [7]4 years ago
5 0

Answer:

D

Explanation:

While all the mentioned phenomena do take place in the universe, the only one that provides evidence of the Big Bang is option D, where distant galaxies are moving further away from us as time goes on.

This is believed to be a result from the Big Bang that projected the known universe into all directions, and they are moving away because of momentum from the explosion so many years ago.

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IM TIMED HELP PLSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS!!!!!!!!!!!!!!!!!!Which best describes the convection currents in Earth’s mantle
VLD [36.1K]

Answer:

B i think

Explanation:

google lol but could be wrong

5 0
4 years ago
Read 2 more answers
What is an electrolytic cell?
Verizon [17]

Answer:

Hey mate here is your answer in short

Explanation:

An electrolytic cell uses electrical energy to drive a non-spontaneous redox reaction. An electrolytic cell is a kind of electrochemical cell. It is often used to decompose chemical compounds, in a process called electrolysis—the Greek word lysis means to break up.

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4 0
3 years ago
Read 2 more answers
Do anyone know how to do question B
Over [174]

Answer:

a) IUPAC Names:

                   1) (<em>trans</em>)-but-2-ene

                   2) (<em>cis</em>)-but-2-ene

                   3) but-1-ene

b) Balance Equation:

                       C₄H₁₀O + H₃PO₄   →   C₄H₈ + H₂O + H₃PO₄

As H₃PO₄ is catalyst and remains unchanged so we can also write as,

                                    C₄H₁₀O   →   C₄H₈ + H₂O

c) Rule:

           When more than one alkene products are possible then the one thermodynamically stable is favored. Thermodynamically more substituted alkenes are stable. Furthermore, trans alkenes are more stable than cis alkenes. Hence, in our case the major product is trans alkene followed by cis. The minor alkene is the 1-butene as it is less substituted.

d) C is not Geometrical Isomer:

        For any alkene to demonstrate geometrical isomerism it is important that there must be two different geminal substituents attached to both carbon atoms. In 1-butene one carbon has same geminal substituents (i.e H atoms). Hence, it can not give geometrical isomers.

7 0
3 years ago
In a lab, silver nitrate,AgNO₃, is dissolved in water until no solid is observed in the container. Then, a solution of sodium ch
leva [86]

Answer:

The answer to your question is: A, C, E

Explanation:

After reading the information given, we can conclude that both reactants react to form a new solid product and another product that do not precipitate.

The reaction is:

                         AgNO₃ + NaCl   ⇒      AgCl  +  NaNO₃

a. Formation of a solid indicates that a chemical reaction occurred  This option is correct, precipitation indicates that a changed occurred in the solution due to a chemical reaction.

b. The initial disappearance of silver nitrate in water indicates a chemical reaction occurred  No, what is happing is that silver nitrate is dissolving in water, this process is a physical change because matter do not change its nature.

c. The color change of the solution indicates a chemical reaction occurred  This option is true, when a color appears suggest the formation of a new product.

d. A chemical reaction occurred when silver nitrate was added to water

This option is not correct, in this process silver nitrate is dissolving in water but it is not a chemical reaction because matter does not change is nature.

e. A chemical reaction occurred when the solutions were combined  This option is true because silver nitrate and sodium chloride react to form a new product (solid formation and change in color).

f. The lack of temperature change indicates a chemical reaction didn't occur This is false, some reactions do not need a change of color to happen.

6 0
3 years ago
The knowledge produced by science builds on old ideas and is constantly changing.
VikaD [51]
Yes it is always changing, as time moves on new technological advancements are made. This makes it possible for new ideas to be created. For example the depiction of an atom went through many stages throughout the years in order to find out our current final version. New scientists and new ideas can add on to older ones, making explanations that make more scientific sense.
6 0
3 years ago
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