I just need an answer for question 3,4 and 5. thank you so much. ​

I Just Need An Answer For Question 3,4 And 5. Thank You So Much.

Answers

Answer 1
Number 3,In 1913,Neils Bohr,a student of Rutherford’s developed a new model of the atom.number 5,the chemical elements are arranged in order of increasing atomic number.elements in the same group have similar chemical properties. Hope this helps!

Related Questions

K+ Cl2 → КСІ balance equation​

Answers

Answer: 2K + Cl2 —> 2KCl

What is the difference between a compound and a mixture?



Group of answer choices

A compound is just a mixture of elements.

A mixture can be physically separated into its components; a compound cannot be physically separated into its components.

The components of a mixture do not have the same properties individually as they do when mixed.

A compound can be physically separated into its components; a mixture cannot be physically separated into its components.

Answers

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.

Why is Graphite soft

Answers

Answer:

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

3. The presence of the same
a. fossils
b. rocks
on several continents supports the hypothesis of continental drift.
c. neither a norb
d. both a and b

Answers

Answer:

with someone or in the same place as them

Explanation:

What element is the only Noble Gas in the s-block?

Answers

Answer:

Helium

Explanation:

Answer:

helium i guess i m not sure

I need help with that box

Answers

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

explain how to balance the chemical equation, KClO3 ⟶ KCl + O2 and include all steps

Answers

The balance of chemical equation : 2KClO₃ ⟶ 2KCl + 3O₂

Further explanation  

Equalization (balance) of chemical reactions can be done using variables. Steps in equalizing the reaction equation:  

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.  2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product  3. Select the coefficient of the substance with the most complex chemical formula equal to 1  

Reaction

[tex]\tt KClO_3\Rightarrow KCl+O_2[/tex]

1. Coefficient

KClO₃ ⟶ aKCl + bO₂

2. Equation

K ⇒ left =1, right=a ⇒a=1

Cl⇒ left =1, right=a ⇒a=1

O ⇒ left = 3, right = 2b ⇒3=2b, b = 1.5

The equation turns into :

KClO₃ ⟶ KCl + 1.5O₂

multiplied by 2

2KClO₃ ⟶ 2KCl + 3O₂

Compounds are created when atoms of different elements _____.

1.form chemical bonds
2.have different chemical properties
3.form physical bonds
4.have similar chemical properties

Answers

Answer:

1.form chemical bonds

If a sample of copper is 215g, how many moles of copper atoms are in the sample?

Answers

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.

Which of the following statements regarding the moon and Earth is correct? Question 9 options: A) The moon is older than Earth by approximately 300 million years. B) Earth is tidally locked, while the moon spins on its axis. C) Earth and the moon have nearly the same mass. D) Earth and the moon are nearly the same age.

Answers

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

When did the Moon form?

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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Identify the atom
H₄
CH₄
N

Answers

Answer:

Organic Molecule.

Explanation:

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

Examples could be C₄H₅, C₉H₁₈O₆, C₅H₁₂N.

What mass of ethanol will All
a 250.0 ml container if its
density is 0.789 g/ml?

Answers

Answer:

The answer is 197.25 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

volume = 250 mL

density = 0.789 g/ml

So we have

mass = 250 × 0.789

We have the final answer as

197.25 g

Hope this helps you

the number of protons will tell you what elements it is. T or F plzz help​

Answers

Answer:

True

Explanation:

There are two ways to tell elements apart from each other: the atomic number or the number of protons. The atomic number tells the number of protons in the element.

For example:

There are two given elements. One has 3 protons and an atomic number of 3 while the other has 7 protons and an atomic number of 7. Which one is Lithium?

Lithium has an atomic number of 3, which means it has three protons, which means Lithium is the one with 3 protons.

A star's mass determines the —
A) shape of a Star
B) location of a star
C) length of its lifecycle
D) galaxy it belongs to

Answers

It’s either A or C sorry I can’t help more

The kinetic energy of a moving object depends on its mass and its
a. volume.
b. velocity.
c. distance.
d. acceleration.

Answers

I think the answer is a, volume, but I still might be wrong.
It’s the volume of the object

Why were enslaved Africans in high demand in the southern colonies?

Answers

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 ❤✨

Slaves were in high demand because they were the main source of labor meaning they would do all of their owners work and without the slaves it was hard for them to keep up with their house, farm, work etc

PLZZ HELP!!
An atom has atomic number 11 and mass number 23. How many electrons does the atom have?
23
22
O 12
O 11

Answers

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.

organize the following elements in order of increasing atomic radius (Ge, He, Sr, O, Ba)

Answers

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.

If all the deer disappeared from this community, which change would be most
likely to occur?

Answers

Answer:

i think the grass population would decrease

Explanation:

Answer:

The Coyote population would decrease

Explanation:

Egg + Heat

Proof of a Chemical Reaction

Answers

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! :)))))

what is the first step of scientific method A.Hypothesis
B. question
C.control
D.procedures​

Answers

Answer:

B

Explanation:

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

The rows in the periodic table are called periods.
What is true about elements in the same period?

Answers

Answer:

elements in the same period have the same number of shells

the period number the element is in, that is the number of shells it has.

Which of the following is NOT a characteristic of a compound?
A. has different properties from the elements that formed it
B. pure substance made of two or more elements
C. can be represented by a chemical formula
D. different samples have different properties

Answers

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.

A compound can be regarded as a substance which is formed by chemical  combination of two or more elements.Examples of compound are water ( H2O), Sodium chloride ( NaCl)

Some of the properties of a compound are;

A compound will always has a different properties which is different from the properties of each of the elements making up the compound.A compound are formed as a result of  two or more elements that combined chemically.A compound can be identified with its chemical formula.

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

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The maximum amount of statie friction between this chair
and the floor is 175 N.
Which action would cause the chair to move to the left?
A. Applying 100 N of force to the chair from the left
B. Applying 200 N of force to the chair from the left
O c. Applying 200 N of force to the chair from the right
O D. Applying 100 N of force to the chair from the right

Answers

In order to overcome static friction, a force greater than 175 N would need to be applied to the chair, so we can eliminate A and D. Since you want to move the chair to the left, you’d have to push from the right, so the correct answer is
C) applying 200 N of force to the chair from the right

Answer:

C

Explanation:

A p ex

What all indicates a CHEMICAL change? *
A Solid melting into a liquid
After the change the substance is still reactive with oxygen
One substance becomes two new substances
The melting point was 100 deg C but after the change the melting point was 256 deg
C.

Answers

one substance becomes two new substances

Which of the following is the conjugate acid of H2P04- ?
A. HAP04
O B. PO 3-
O C. HP04-2
O D. H3PO4

Answers

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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BE FIRST TO ANSWER PLEASEEE ASAP! :D

Answers

Answer:

I want to say E or B

Explanation:

1 point
Nitrogen has three occurring isotopes: Nitrogen-13, Nitrogen-14, Nitrogen-15. Which isotope is the most abundant?

Answers

Explanation:

Nitrogen-14 is the most abundant isotopes of Nitrogen.

If a gold bar is 16,000 g mass and 800 cm^3 volume what is the density?

Answers

Answer:

The answer is 20 g/cm³

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

20 g/cm³

Hope this helps you

Find the percent of oxygen in CaClO3)2 Show your work

Answers

So in calcium chlorate, there is one calcium, 2 chlorines, and 6 oxygens. To find the percent of oxygen in the compound, find the weight of the oxygen and divide it by the total weight of the compound:

weight of oxygen (95.94g/mol) / weight of entire compound (206.98g/mol)
= 0.4635

Finally, to convert this to a percentage you multiply it by 100

0.4635 x 100 = 46.35% Oxygen by mass
Other Questions
Read the passage Which statement from the passage provides evidence supporting the reason "Washington contributed to important documents"? George Washington helped form our government. He contributed to important documents. He guided the creation of the US Constitution. Washington made contributions to our government that are still in place O George Washington helped form our government. O George Washington created the US Constitution. today. Washington made contributions to our government. OWashington's contributions are still in place today.Which statement from the passage provides evidence supporting the reason "Washington contributed to important documents"?A) George Washington helped form our government.B) George Washington created the US constitution.C) Washington made contributions to our government.D) Washington's contributions are still in place today. The daily high temperatures in a vacation resorts in approximately normal, with a mean temperature of 75 Fahrenheit and a standard deviation of 6 degrees. What percentage of days have a high temperature between 66 and 88?A.17.01%B.35.62%C.64.37%D.72.99% (ANSWER ASAP PLEASEE LOL ILL SEND YOU A BOX OF CHOCLATES LOL I GOT YOU IF YOU GOT ME) How does the description of chores in paragraph 3 contribute to the authors explantation of division of labor?Who does the different chores or jobs in your family? Maybe one night your mom makes dinner, your dad does the laundry, and you have to make your bed. Families will divide these jobs up so that all of the work gets done quickly. They also want to make sure that all of the work is done well. What would happen if two people made dinner every night, but nobody bothered to do the laundry? You would have too much food and no clean clothes! A division of labor is when everyone does a different job. What are environmental communication barriers.A- Factors arise from moodB- Factors arise from Location C- Factors arise from economic statusD- Factors arise from social status HELP I WILL GIVE BRAINLIESTWhich statement best describes a population that competes for reproductive purposes? Animals push each other to access water. Hyenas quarrel over a fresh animal kill.Squirrels and chipmunks collect food for the winter months. Members of the same species battle each other to protect their young. What natural resource isnecessary for the lucrative cultivation of rice? 2.5 puzzle time Which month has 28 days similarly in a sentence Whats the rule its algebra 1 Why is resilience (the will to keep trying) an important quality for digital artists?Digital art is one of the easiest fields to do well in.Working in the digital arts require working with others.The first draft of an artistic work is usually also the good copy.Most artists need to learn from criticism and feedback about their work. The product of negative three and a number is equal to the sum of the number and four. what one is a metaphor? On the planet Umpt, there are 14 boondins to every 6 totts. If farmerCoraz has 80 boondins on his elentire farm, how many totts are on thefarm?No decimals. Use a mixed number if needed. moon phase that is half light and half dark Which word match the long vowel sound to bride and shaveAimTypePreyGrind These steps were used to construct the perpendicular bisector of segment DE.Which statement MUST be true?PHOTO ABOVE Help me please math is a pain... On September 1 of the current year,Scots Company experienced a flood that destroyed the company's entire inventory.Because the company had not completed its month end reporting for August,it must estimate the amount of inventory lost using the gross profit method.At the beginning of August,the company reported beginning inventory of $215,450.Inventory purchased during August was $192,530.Sales for the month of August were $542,500.Assuming the company's typical gross profit ratio is 40%,estimate the amount of inventory destroyed in the flood.A) $87,480B) $134,520C) $109,980D) $82,480E) $81,480 Which is enough information to prove that u parallel to v? Lines u and v are cut by transversal t. Clockwise from top left, the angles formed by t and u are 1, 2, 3, 4; formed by v and t are 5, 6, 7, 8. Angle 2 is congruent to angle 4 Angle 4 is congruent to angle 8 Angle 6 + angle 7 = 180 degrees Angle 3 + angle 4 = 180 degrees Please helpText: but more important by far is the abundant testimony about Conrads savages which we could gather if we were so inclined from other sources and which might lead us to think that these people must have had other occupations besides merging into the evil forest or materializing out of it simply to plague Marlowe and his dispirited band.For as it happened ,soon after Conrad had written his book an event of far greater consequences was taking place in the art world of Europe. This is how Frank Willet ,a British art historian describes it:Gauguin has gone to Tahiti the most extravagant individual act of turning to a non-European culture in the decades immediately before and after 1900, when Europeans artists were avid for new artistic experiences, but it was only about 1904-5 that African art began to make its distinctive impact. one piece is still identifiable; it is a mask that has been given to Maurice Vlaminck in 1905. He records that Derain was speechless and stunned when he saw it, bought it from Vlaminck and it showed it to Picasso and Matisse,who were also greatly affected by it.Ambroise Vollard then borrowed it and had it cast in bronze...Th revolution of twentieth century art under way! The mask in question was made by other savages living just north of Conrads River Congo.They have a name too: the fang people,and are without a doubt among the worlds greatest masters of the sculptured form.The event Frank Willet is referring to marked the beginning of cubism and the infusion of new life into European art that had run completely out of strength. The point of all of this is to suggest Conrads picture of the peoples of the Congo seems grossly inadequate even at the height of their subjection to the ravages of King Leopolds International Association for the Civilazation of Central America. QUESTIONS: What claim does Achebe make in this passage?A: Conrads depiction of Africans Is not accurate B: Willets depiction of African culture is fairC: Conrad and Willet both dehumanize Africans What type of evidence does Achebe use to support this claim? A: anecdotal B: textualC: historicalHow does the evidence support the claim?A: it contrasts Conrads limited viewpointB: its supports Conrads perspectiveC: its denies claims that Conrad is racist