Please help me with this question after I have help with my questions i will be giving away 50 points to 4 people to keep on the look out on my page xxx

Answer:

He

O

Ge

Sr

Ba

Explanation:

An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.

In general, the size of an atom will decrease as you move from left to the right of a certain period.

Answer:

D

Explanation:

Melting of ice is a physical change as there no new compound is forming only state is changing So Option D is correct option. For second question Option D is correct option as combustion reaction is taking place.

Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same

One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.  Physical change is just opposite of chemical change. Phase change is an example of physical change.

Thus option D  is correct option in both cases.

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Answer:

B

Explanation:

Question. You need to ask questions before you can set up to perform an experiment.

The statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).

The Moon formation refers to the geological period of time in which our natural satellite emerged as an independent celestial body.

It has been proposed that the Moon emerged first compared to the Earth (approximately 300 million years).

In conclusion, the statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 16,000 g

volume = 800 cm³

We have

[tex]density = \frac{16000}{800} = \frac{160}{8} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

C

Explanation:

Yessir

Answer:

Carbon

Explanation:

Organic compounds must contain carbon. They also usually contain hydrogen,  oxygen, and often nitrogen and other compounds such as phosphorus.

Nearly all organic compounds contain carbon-hydrogen bonds.

Answer:

Graphite is soft because it has weak inter molecular forces between its layers.

Answer:

Shiny like a limousine

You're spending like a cash machine

Smile, show your golden teeth

That's how you cover up your cavities

You're glowing like a diamond ring

I saw you bought some other things

You're spending like a cash machine

To cover up your insecurities

Don't front, no need ty67t6767

Explanation:

Answer:

A

Explanation:

Answer:

A. Sorry if wrong, but if i'm right can you mark brailniest pls?

Answer:

3.38 moles.

Explanation:

The following data were obtained from the question:

Mass of copper (Cu) = 215 g

Number of mole of copper (Cu) =...?

The number of mole of copper (Cu) in 215 g can be obtained as follow:

Mass of copper (Cu) = 215 g

Molar mass of copper (Cu) = 63.55 g/mol

Number of mole of copper (Cu) =...?

Mole = mass /Molar mass

Mole of Cu = 215/63.55

Mole of Cu = 3.38 moles

Therefore, 3.38 moles of copper (Cu) is present in the sample.

Answer:

Physical change

Explanation:

There are two types of changes: physical change and chemical change. Physical change is defined as the change that changes the physical appearance of the substance and do not affcet the chemical composition of the substance whereas chemical change causes changes in the chemical composition of the susbstance.

The given example shows physical change because solid calcium undergoes sublimation. process in which a solid substance changes into gaseous phase directly without undergoing liquid phase.

Hence, the correct answer is "Physical change".

Answer:

i think the grass population would decrease

Explanation:

Answer:

The Coyote population would decrease

Explanation:

I hope this helps.

the first line would be SN, 50, 50, 69

second line would be PT, 78, 78, 117

third line would be MO, 42, 42, 54

fourth line would be NI, 28, 28, 31

fifth line would be U, 92, 92, 146

Answer:

Organic Molecule.

Explanation:

Any molecule with C atoms and H atoms are organic molecules in chemistry.

Examples could be C₄H₅, C₉H₁₈O₆, C₅H₁₂N.

Answer:

Hi!

The best way you can receive a Brainliest is to help others. You shouldn't focus on receiving a brainliest, rather being glad you helped someone who needed it.

I hope you take this advice and answer a question! :)

Answer:

Slaves were in high demand in the southern colonies because they were the main source of labor. ... Bacon and others colonists wanted to take the Natives land.

Explanation:

HOPE THIS HELPED ❤✨

Answer:

Water+Heat

proof of physical reaction

Explanation:

Chemical reactions are reactions that can't be undone ex cooking and egg.

Physical reactions are reactions that can be undone ex boiling water.

Answer:

Egg + Heat = Chemical Change

Explanation:

This is a chemical change because it cannot be undone. Once it changed its form you could not revert it back to its original self.

I hope this helps you! :)))))

Answer:

I think it's D

sorry if I'm wrong.

Explanation:

Options that are not characteristics of compound in the question is D. different samples have different properties.

Some of the properties of a compound are;

Therefore, option D is correct because a compound will only has its own properties not that

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Answer:

1.form chemical bonds

Explanation:

Nitrogen-14 is the most abundant isotopes of Nitrogen.

Answer:

12

Explanation:

23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.

Answer:

C

Explanation:

A p ex

Answer:

I want to say E or B

Explanation:

Answer:

with someone or in the same place as them

Explanation:

Answer:

the answer is c

Explanation:

Answer:

phosphoric acid H3PO4

The conjugate acid of H₂PO⁴⁻ is H₃PO₄. Therefore, option D is correct.

A conjugate acid is a species that is formed when a base accepts a proton (H⁺). It is the species that is one proton (H⁺) more acidic than the original base.

The base is the species that can accept a proton (H⁺), and the conjugate acid is the species that is formed when the base accepts the proton. The conjugate acid has one additional proton compared to the base.

Conjugate acids play an important role in acid-base reactions as they are formed when bases accept protons, and they can donate protons in subsequent reactions to regenerate the original base.

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Answer:

Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances. Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.

Answer:

The answer is a mixture can be physically separated into its components; a compound cannot be physically separated into its components.

Answer: martin luther king jr

Explanation: He led peaceful protests against the discrimination that the people of the United State did against African American men, women, and children. He was a celebrity due to his have "I a dream speech" that he said in front of the lincoln memorial.  Plus he didn't approve of violence when trying to protest African American rights.

Answer:

Who is Martin Luther King and why is he famous?

Exsplanation

A Baptist pastor and civil rights activist, King worked to end legal segregation of blacks in the United States. He gave his famous “I Have a Dream” speech at the August 1963 March on Washington, and won the Nobel Peace Prize in 1964 at age 35 – the youngest man to have received the award.Apr 4, 2018