2. The model on the right looks bumpy, but when you break a large salt crystal in two, the edges of the split often look straight and feel smooth. Is there a problem with the model?

Answers

Answer 1

Answer:

he Solids model formed by atoms as solid spheres for macroscopic measurements, the model has no problems, because the atoms are extremely small

Dalton's atomic model was the first scientifically based model formulated in 1808, it consists of atoms with spheres that cannot be divided and solids are formed by contact between the spheres and chemical compounds are formed by joining atoms of two or more elements, this model is used to approximate solids such as solid spheres there are today.

The size of these spheres (atoms) is very small, nowadays it is known that it is of the order of 10⁻⁹ m, therefore, having a macroscopic crystal more than 10⁻⁶ m in length, it is impossible to measure fluctuations in the sizes of the spheres, since there are 10⁹ spheres in this volume, therefore it is not possible to measure the fluctuations with instruments,

To be able to measure this fluctuation, very small samples and very high resolution transmission microscopes are needed.

In conclusion, the model of the atom as solid spheres for macroscopic measurements, the model has no problems.

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Answer 2

Answer:

Answer:

Maybe the sizes are too big which means that they need to be smaller because the more compact they are the more smooth and straight they will be because when they are too big it is easier to break them which would lead to a bumpy surface.

Explanation:

I don't know :)

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Which of the following solids has the highest melting point?(1) H2O(s) (3) SO2(s)(2) Na2O(s) (4) CO2(s)

Answers

The answer is (2) Na2O. Considering these compounds status under room temperature. H2O is liquid. CO2 and SO2 are gas. Na2O is solid. So the Na2O has the highest melting point.

The solid having the highest melting point is Na₂O and the correct option is option 2.

The melting point of a solid is a measure of the temperature at which it changes from a solid to a liquid state. It is influenced by the strength of the intermolecular forces between the particles in the solid.

Na₂O(s), which is sodium oxide, has the highest melting point among the given options. This is because Na₂O is an ionic compound composed of positively charged sodium ions (Na⁺) and negatively charged oxide ions (O²⁻). Ionic compounds have strong electrostatic forces of attraction between the ions, known as ionic bonds. These bonds require a significant amount of energy to break, resulting in a high melting point.

H₂O(s) (water ice) has a lower melting point because it is a molecular compound held together by weaker hydrogen bonds.

SO₂(s) (sulfur dioxide) and CO₂(s) (carbon dioxide) are molecular compounds with weaker intermolecular forces, such as London dispersion forces, resulting in lower melting points compared to ionic compounds.

Thus, the ideal selection is option 2.

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The chemical equation below shows the photosynthesis reaction. 6CO2 + 6H2O mc010-1.jpg C6H12O6 + 6O2 The molar mass of carbon dioxide (CO2) is 44.01 g/mol. The molar mass of water (H2O) is 18.01 g/mol. A reaction uses 528 g of CO2. How many moles of water are used in this reaction?

Answers

Answer:

12 mol of water

Explanation:

$6CO_2 + 6H_2O \longrightarrow C_6H_(12)O_6 + 6O_2$

First we must find the moles of CO2.

We know that 1 mole of co2 has a mass of 4.01 g so how many moles will there be in 528 g.

We apply a simple rule of three

$44.01 g CO_2\longrightarrow 1 mol CO_2\n 528 g CO_2\longrightarrow x\nx= 528/44.01\nx=12 molCO_2$

By stoichiometry we know that for every 6 moles of carbon dioxide 6 moles of water are needed, now if we have 12 moles of carbon dioxide how many moles of water will be needed

We apply a simple rule of three

$6 molCO_2 \longrightarrow 6 mol H_2O\n 12 mol CO_2 \longrightarrow x\nx= ((12).(6))/(6)\n x= 12 mol H_2O$

Given:
6CO2 + 6H2O -> C6H12O6 + 6O2
molar mass of carbon dioxide (CO2) is 44.01 g/mol
molar mass of water (H2O) is 18.01 g/mol
528 g of CO2

Required:
moles of water

Solution:

528 g of CO2/ (44.01 g/mol CO2) = 12 moles CO2

12 moles CO2 (6 moles H2O/ 6 moles CO2) = 12 moles H2O

12 moles H2O (18.01 g/mol H2O) = 216.12 grams H2O

What mass of K2SO4 would you need to prepare 1500g of 5.0% K2SO4 (m/m) solution?

Answers

To solve this we must be knowing each and every concept related to mass. Therefore, mass of K $_2$ SO $_4$ would you need to prepare 1500g of 5.0% K $_2$ SO $_4$ (m/m) solution is 75 g.

What is mass?

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mass of solution = 1500 g

5.0 % = 5.0 / 100 = 0.05

mass percentage = mass of solute / mass of solution

substituting all the given values in the above equation, we get

0.05 = mass of solute / 1500

mass of solute = 0.05 x 1500

mass of solute = 75 g of solute

Therefore, mass of K $_2$ SO $_4$ would you need to prepare 1500g of 5.0% K $_2$ SO $_4$ (m/m) solution is 75 g.

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Mass of solute = ?

Mass of solution = 1500 g

5.0 % = 5.0 / 100 = 0.05

w = mass of solute / mass of solution

0.05 = ? / 1500

w = 0.05 x 1500

w = 75 g of solute

hope this helps!

PLS HELP What is chemistry?

Answers

Answer:

A branch of science

Explanation:

CHemistry is the investigation and studying substances and their reaction with other elements

Answer:

chemistry :-

A branch of science in which we. . study about chemical

in the chemistry we studied about. elements and compounds and their

composition and reaction

A nondirectional alternative hypothesis claims that no difference will be found between the research variables.a. True
b. False

Answers

Answer: The given statement is False.

According to alternative hypothesis, observed difference exists between research variables, which does not occur by chance.

Whereas, a non directional alternative hypothesis has no definite directions of the difference but a certain difference does exist.

Thus, the given statement is False.

Answer:

false

Explanation:

Which compound is an exception to the octet rule?
H2O
HCl
CCl4
ClF3

Answers

$\boxed{{\text{Cl}}{{\text{F}}_3}}$ is an exception to the octet rule.

Further explanation:

Chemical bond:

The attraction between atoms, molecules or ions that is responsible for the formation of chemical compounds is known as a chemical bond. It is formed either due to electrostaticforces or by the sharing of electrons. There are many strong bonds such as ionic bonds, covalent bonds, and metallic bonds while some weak bonds like dipole-dipole interactions, London dispersion forces, and hydrogen bonding also exist.

Octet rule:

According to this rule, the elements have the tendency to bond with other elements in order to acquire eight electrons in their valence shells. This results in achieving a stable noble gas configuration. Generally, all elements obey octet rule but there are some exceptions to this rule. For example, Be and B do not follow the octet rule.

The atomic number of oxygen is 8 and therefore it has six valence electrons in it. The atomic number of hydrogen is 1 so it has only one valence electron in its valence shell. Oxygen needs two more electrons to fulfill its octet so it forms two single bonds with two hydrogen atoms. Therefore ${{\text{H}}_{\text{2}}}{\text{O}}$ obeys the octet rule. (Refer to the structure in the attached image).

The atomic number of chlorine is 17 and therefore it has seven valence electrons in it. The atomic number of hydrogen is 1the so it has only one valence electron in its valence shell. Chlorine needs one more electron to fulfill its octet so it forms one single bond with a hydrogen atom. Therefore HCl obeys the octet rule. (Refer to the structure in the attached image).

The atomic number of chlorine is 17 and therefore it has seven valence electrons in it. The atomic number of carbon is 6 so it has four valence electrons in its valence shell. Each chlorine atom requires an electron to complete its octet. So four single bonds are formed between one carbon atom and four chlorine atoms. Therefore ${\text{CC}}{{\text{l}}_{\text{4}}}$ follows the octet rule. (Refer to the structure in the attached image).

The atomic number of chlorine is 17 and therefore it has seven valence electrons in it. The atomic number of fluorine is bond so it has seven valence electrons in its valence shell. Both chlorine and fluorine are just one electron short of the stable noble gas configuration. In ${\text{Cl}}{{\text{F}}_{\text{3}}}$ , there is only one chlorine atom and three fluorine atoms so their octets cannot be fulfilled. But one chlorine atom can form only one bond with one fluorine atom. Therefore ${\mathbf{Cl}}{{\mathbf{F}}_{\mathbf{3}}}$ does not follow octet rule and hence is an exception to this rule. (Refer to the structure in the attached image).

Learn more:

1. Which molecule cannot be adequately described by a single Lewis structure/ brainly.com/question/6786947

2. Do carbon dioxide and water have the same geometry? brainly.com/question/2176581

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical bonding and molecular structure

Keywords: H2O, HCl, CCl4, ClF3, octet rule, chemical bonds, hydrogen, chlorine, fluorine, carbon, 1, 8, 9, 17, one electron, seven electrons, six electrons, four electrons, exception.

Answer:Answer is Option 4 or (D) On EDGE 2021

Explanation:

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