Evidence that best supports the theory of biological evolution was obtained from the

Answers

Answer 1

Answer: the homologous structures and the analogous structures of different species.

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How many atoms are in Na2CrO4

Answers

We have that for the Question "how many atoms are in Na2CrO4" it can be said that The total number of atoms is

X=7 atoms

From the question we are told

how many atoms are in Na2CrO4

Generally

In identifying the atoms are in Na2CrO4 we must first look closely at the compound Na2CrO4

We have

Na=1

Cr=2

O=4

Therefore

The total number of atoms is

X=1+2+4

X=7 atoms

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The formula shows the number of each type of atom in the molecule. There are 2 atoms of sodium, one atom of chromium and four atoms of oxygen, being a total number of 7 atoms.

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd) 0.5 m 2 m 250 m 750 m'

Answers

Answer:

The answer is 2 m.

Explanation:

THE Answer IS B 2m

Explanation:

Joshua has invented a special greenhouse. By turning a special dial in his new greenhouse, Joshua can choose which type of sunlight can enter the greenhouse. When only ultraviolet light is allowed to enter the greenhouse, what will happen while Joshua is standing inside the greenhouse?Joshua can see objects inside the greenhouse
As time passes, it becomes warmer inside the greenhouse than it is outside
Joshua can see objects outside the greenhouse
As time passes, Joshua begins to sunburn

Answers

Answer:

As time passes, it becomes warmer inside the greenhouse than it is outside

Explanation:

hope this helps

I need help for something like this help me plz

8. Which of the following statements about non-metals is correct?O A. Non-metals tend to have low ionization energy and high electronegativity.
B. Non-metals tend to have high ionization energy and high electronegativity.
O C. Non-metals tend to have low ionization energy and low electronegativity.
D. Non-metals tend to have high ionization energy and low electronegativity.

Answers

The statement about non-metals that is correct is B. Non-metals tend to have high ionization energy and high electronegativity.

A non-metal doesn't she the characteristics of a metal. It has poor thermal and electrical conductivity. Also, non-metals have a low melting point and low density.

On the other hand, mon-metals have high ionization energy, high electronegativity, and high electron affinity. When there react with other elements, they gain electrons.

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Answer:

The correct answer is option B, that is, non-metals tend to exhibit high electronegativity and ionization energy.

Explanation:

A chemical element, which is primarily devoid of the feature of metal is termed as a non-metal. A non-metal generally exhibit poor electrical and thermal conductivity and is brittle in solid-state. The non-metals generally possess a comparatively low boiling and melting point and also has low density.

Chemically, the non-metals exhibit comparatively high electron affinity, high electronegativity, and high ionization energy. Upon reaction with other elements and chemical compounds, these elements share or gain electrons. The non-metals are typically seventeen in number and are differentiated into two kinds, that is, noble gases and reactive non-metals.

What are the three types of nuclear particles emitted when a radioactive atom decay?

Answers

Answer:

Alpha particles, Beta particles and Gamma rays

Explanation:

The emission of particles when a radioactive atom decays is called radioactivity.

An atom is radioactive as a result of unstable nucleus. This unstable nucleus of the atom disinintegrates and leads to emission of Alpha particles, Beta particles and gamma rays.

Alpha particles contain 2 protons and 2 neutrons. They are positively charged

Beta particles are negatively charged

Gamma rays are electromagnetic waves with short wavelength

Alpha, Beta, and Gamma Decay

What is happening within the system when it is at equilibrium in terms of concentration, reactions that occur, and reaction rates? 2CH4(g) <--> C2H2(g) + 3H2(g)

Answers

Answer and Explanation:

It is worthy to be mentioned that the equilibrium in this reaction is dynamic equilibrium.

In terms of concentration: the concentration of reactants (CH4) and products (C2H2 & H2) do not change and be constant at the equilibrium, that 2 moles of CH4 give one mole of C2H2 and 3 moles of H2.
In terms of reactions that occur: the reactions that occur at the equilibrium are the forward and the reverse reaction. The forward reaction: 2CH4 → C2H2 + 3H2 and the reverse reaction: C2H2 + 3H2 → 2CH4.
In terms of reaction rates: At equilibrium the rate of the forward reaction is equal to the rate of the reverse reaction.

Answer:

In a chemical reaction equilibrium is in the state which reacts with both products and reactants. Both reverse and forward are happening and both reaction rates forward and reverse are equal.

Explanation:

This is what i put and i got it right.

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