What bonding may be found between molecules of NaCl?

Answer:

physical projects

Journal entries

Materials

Lab reports

Artworks

Explanation:

Definition of a Portfolio:

Portfolio can be defined as a physical collection of student work that includes materials such as written assignments, completed tests, artwork, lab reports, physical projects and other material evidence of learning progress and academic accomplishment, including awards and honors,

A portfolio is a long-term form of self reflection and assessment that students do together.

Portfolios are a great way to demonstrate the competencies you would list on a resume or talk about in a science interview

Answer:

A) They all have 12 protons.

Explanation:

Magnesium has an atomic number of 12 which means it has 12 protons. All Magnesium atoms have 12 protons, the neutrons however may differ which produces things called isotopes where the atoms have same protons but neutrons change.

Keep in mind the atomic number is unique to each element, so 12 atomic number will always be Magnesium, 1 will always be Hydrogen and so on.....

Answer:

The cytoplasm of erythrocytes is rich in hemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells and the blood. Each human red blood cell contains approximately 270 million of these hemoglobin molecules.

Explanation:

hope this helps(;

The molar heat of vaporization of substance Z is 3.375 kJ/mol.

The molar heat of vaporization of substance Z is calculated as follows;

ΔH(vap) = E/n

where;

ΔH(vap) = 5.4 kJ/1.6

ΔH(vap) = 3.375 kJ/mol

Thus, the molar heat of vaporization of substance Z is 3.375 kJ/mol.

Learn more about molar heat here: https://brainly.com/question/20716582

#SPJ1

Answer:

The Copernican revolution demonstrated that science was a process of changing ideas.

We can see that when we have the giant ionic compounds, the melting and the boiling points are very high.

Sodium chloride (NaCl): Melting point of 801 °C, boiling point of 1413 °C.

Magnesium oxide (MgO): Melting point of 2852 °C, boiling point of 3600 °C.

Calcium fluoride (CaF2): Melting point of 1418 °C, boiling point of 2533 °C.

Potassium chloride (KCl): Melting point of 776 °C, boiling point of 1500 °C.

Barium oxide (BaO): Melting point of 1923 °C, boiling point of 2280 °C.

As all of these substances have giant ionic structures, their melting and boiling points are generally very high due to the strong electrostatic forces of attraction between their oppositely charged ions. The melting and boiling points of these substances depend on the strength of these forces, which in turn is influenced by the charge and size of the ions, as well as the arrangement of the ions in the crystal lattice.

Learn more about boiling points:https://brainly.com/question/2153588

#SPJ1

Unit' is the word used to describe how something is measured. When researching a question in science, we collect data, interpret it, and share the results with other scientists. A common measurement system allows us to make direct comparisons instead of having to know things like how much a certain animal weighs.

Calcium sulfate (CaSO4) is a chemical compound made from calcium, oxygen, and sulfur.

The major sources of calcium sulfate naturally happen are gypsum and anhydrite, which occur at many position worldwide as evaporites.

A simple procedure for preparing acicular calcium sulfate dihydrate is on condition that in which a slurry of calcium carbonate carrying 100 to 800 grams per lite of calcium carbonate is assorted with a solution of sulphuric acid carrying 80 to 500 grams per liter sulphuric acid in proportions that construct calcium sulfate.

So we can conclude that Calcium sulfate, CaSO4, is a natural happen calcium salt.

Learn more about Calcium here: https://brainly.com/question/26636816

#SPJ1

7 moles of Cr

Given that there is 1 mole of he compound Cr7(PO4)3, the 1 mole of the compound is composed of 12moles of oxygen, 3 moles of phosphorous and 7 moles of chromium.

Hence we can conclude that there will be 7 moles of Cr in 1 mole of Cr7(PO4)3

Answer:

N = M / mW = 4850 / (3.05 * 10-22) = 1.59 * 1025 atoms of tungsten.

To find the number of tungsten atoms in 37.9 milligrams of tungsten, we first need to convert the mass from milligrams to grams. 1 milligram is equal to 10^-3 grams.

37.9 milligrams = 37.9 x 10^-3 grams = 0.03709 grams

Now we have the mass of tungsten in grams. Next, we need to find the number of atoms by dividing the mass of tungsten by the mass of a single tungsten atom.

0.03709 grams / (3.05 x 10^-22 grams/atom) = 12.16 x 10^21 atoms

Therefore, there would be 12.16 x 10^21 atoms of tungsten in 37.9 milligrams of tungsten.

Note: This is a very large number, it is more commonly expressed in scientific notation.

Answer:

2 seconds

Explanation:

Answer:  1,950 N

Explanation:

2812.5N of force is needed to accelerate a 1,875 kg object at a rate of 1.5 m/s².

HOW TO CALCULATE FORCE:

Learn more at: https://brainly.com/question/19573976?referrer=searchResults

The answer is Hydrogyn bonding. It keeps the water molocules bonded together and in a liquid state, without it it'd be in a gashious state.

Answer:Hydrogen bonds keep them together in room temperature, hope this helps!

Explanation:

<!> Brainliest is appreciated! <!>

Answer:

Condensation

Explanation:

Zoe is quite keen to have noticed what we call condensation. Air contains many components, one of those being water vapor. Like how sugar is soluble in water, water can be said to be "soluble" in air. Water will evaporate into the air to a certain extent. The higher the temperature of the air, the more water the air can hold. If the air has more water that it can hold (potentially because of a temperature decrease), the extra water will come out of the air. Zoe's water bottle was cold, and because the air around Zoe's bottle had cooled down, the air can not hold as much water as it could when it was warm, so the air deposited the extra water in the form of liquid water onto the bottle, giving the illusion that her bottle was sweating.

Answer:

Explanation:

From the given information, the rise in a capillary tube h = \(\dfrac{2T cos \theta }{r \rho g}\)

where:

For the height of water:

Surface Tension T = 66.2 mN/m = 66.2 N/m

θ = 10⁰

Cos θ = cos 10 = 0.985

radius r = 0,257 mm = 0.275 × 10⁻³   m

density of water \(\rho\) = 1000 kg/m³

g = 9.8 m/s²

∴

replacing our values:

h = \(\dfrac{2T cos \theta }{r \rho g}\)

h = \(\dfrac{2\times 66.2 \times 10^{-3} \times 0.985}{0.275 \times 10^{-3} \times 1000\times 9.8}\)

h = 0.0484 meteres

h = 48.3 mm

Since the height h = \(\dfrac{2T cos \theta }{r \rho g}\)

r = 0.275 mm = 0.275 × 10⁻³   m

the density of mecury now \(\rho_H{g}}\)

= 13593 kg/m³

the surface tension of the mercury \(T_{Hg} =470 \times 10^{-3} \ N/m\)

θ = 130⁰

Cos θ = cos 130 = -0.6428

Using the same above equation:

h = \(\dfrac{2\times 470 \times 10^{-3} \times (-0.6428) }{0.275 \times 10^{-3} \times 13593 \times 9.8}\)

h = -0.016494 m

h = 16.49 mm

Answer:

See explanation

Explanation:

A Lewis structure is a representation of atoms of elements using dots. These dots show the number of outermost electrons in the atom. These outermost electrons are involved during ionic bonding.

We can see from the image attached that in ionic bonding, electrons are transferred from the metal to the non metal to form the ionic compound. Arrows have been used to show the transfer of electrons from metals to non metals.

Answer:

d. positron

that's the answer brainly tells me I need to write at least 20 characters and that's d u m b.

Answer:

29 protons and electrons. 34 neutrons

Explanation:

The atomic number is 29 so there are 29 protons. Since copper is a neutral atom so the number of electrons is equal to the number of protons.

Answer:

+4

Explanation:

Treatment of the ammonium metavanadate with hot hydrochloric acid partly reduces the vanadium to the +4 oxidation state in the form of the VO2+ ion.

In vanadium oxide we increase both sides by 4. And we discover that x is equal to five. The vanadium's oxidation number is + 5.

Loss of electron is called as oxidation. and addition of oxygen molecule is also the oxidation.

When an object comes into touch with oxygen or another oxidizer, a chemical reaction occurs. Rust and the brown color of a sliced apple are both examples of oxidation.

Antoine Lavoisier used the term "oxidation" to describe the reaction of a material with oxygen. The meaning was later expanded to cover additional reactions in which electrons are lost, regardless of whether oxygen was present, after it was realized that the substance loses electrons when it is oxidized.

Thus,  the oxidation number of vanadium in V₂O₅ is + 5.

To, learn more about oxidation refer the link below;

https://brainly.com/question/19761029

#SPJ2

Answer:

Blowing up a balloon involves forcing additional air particles from your lungs into the balloon. These particles hit the inside walls of the balloon creating enough air pressure to force the rubber of the balloon to expand and the balloon to inflate.

Explanation: hopes it helps :)

A. Breaking a Cl-Br bond

Answer:

The best and most correct answer among the choices provided by your question is the fourth choice.

The data explains that sodium atoms hardly ever form 2+ ions.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Explanation:

Answer:

The number of moles in 80 g of O2 = 3280 = 2.5.

Explanation:

Trust me ._.

Answer: bar graph, circle graphs, line graphs

Explanation:

Answer:

How the chemical reacts

Explanation:

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

For more such questions on masses visit:

https://brainly.com/question/24191825

#SPJ8

Answer: you would have to remove 80 calories from 1 g of pure water at the freezing point, 0˚ C, to convert it to 1 g of ice at 0˚ C.                                              Explanation:However, 540 calories of energy are required to convert that 1 g of water at 100˚ C to 1 g of water vapor at 100˚ C. This is called the latent heat of vaporization. On the other hand, you would have to remove 80 calories from 1 g of pure water at the freezing point, 0˚ C, to convert it to 1 g of ice at 0˚ C.

The enthalpy change (ΔH) for the reaction CaC(s) + H2O(I) → Ca(OH)(ag) + CH4(g) is -3617.6 kJ.

To calculate ΔH for the reaction CaC(s) + H2O(l) → Ca(OH)2(ag) + CH4(g), we can use Hess's law, which states that the enthalpy change of a reaction is independent of the pathway taken and depends only on the initial and final states.

We can manipulate the given reactions to obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X (unknown value)

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's manipulate these equations to cancel out the common reactants and products and obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's sum up the equations to obtain the desired reaction:(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) 2Ca(s) + O2(g) → 2CaO(s) ΔH = -1271 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

By adding equations (ii), (iii), (iv), and (v), we can cancel out CaO(s), H2O(l), and O2(g):

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -1271 -653.1 -1300.0 -393.5

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -3617.6 kJ

For more such questions on enthalpy visit:

https://brainly.com/question/14047927

#SPJ8

You can note that the roman numerals in the parenthesis of carbon (IV) oxide and carbon (II) oxide indicate the oxidation state of carbon.

Remember that oxides are compounds that are formed with oxygen and another element, in this case, is carbon. It's important to clarify that the oxidation state of oxygen is always -2. The algebraic sum of the oxidation states must be zero.

One way to distinguish this is to write the oxidation state in every element and then, put these numbers on the other element. Let's see this with the example of carbon (IV) oxide (IV is 4):

And for carbon (II) oxide, we can do the same:

Carbon (IV) oxide is CO2 because the oxidation state of carbon is +4 and carbon (II) oxide is CO because the oxidation state of carbon is +2.

Between the physical properties of CO, we have that it's a colorless compound, at ambient temperature is a gas and it's odorless.

For CO2, it's a gas at an ambient temperature too, it's odorless too at low concentrations and it is denser than air.

Answer:

you gotta rotate it 90 degrees and get that screen fixed

Explanation: