Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds

Answer:

molecules

Explanation:

molecules because the summer like atoms and Sciences sciency to be honest

Answer:

=384.48°C

Explanation:

Change in enthalpy  is negative because heat energy is lost to the surroundings.

Change in enthalpy= mass ×specific heat capacity× Change in temperature.

ΔH=MC∅

m=14grams

C of iron= 0.45 J/g°C

∅=?

186.0J= 14.0g × 0.45J/g°C×∅

186=6.3∅

∅=29.5°C

Final temperature= 414.0°C - 29.52°C

=384.48°C

Answer:

B. High temp and low pressure

Explanation:

I got an A on my chem final :) Got this right.

Answer:

A gas is most likely to exist at B) High temperatures and low pressures

Explanation:

Ideal gas behaviour is likely to be at high temperature and low pressure .

The causes of deviations from ideal behaviour may be due to the following two assumptions of kinetic theory of gases.  

The volume occupied by gas molecules is negligibly small as compared to the volume occupied by the gas.

The forces of attraction between gas molecules are negligible.

Deviation occur for real gases with a minor difference from that of an Ideal gas.

When real gases are at low pressures and high temperatures they behave close enough to ideal gases

Answer:

green

Explanation:

Answer:

The answer is Green

Explanation:

I've just answered this on usatestprep.

Answer:

The ideal gas equation

Explanation:

The ideal gas equation is derived from the combination of three gas laws:

The ideal gas law is expressed mathematically as: PV=nRT where:

P is pressure

V is volume

n is the number of moles

R is the ideal gas law

T is temperature.

To obtain the combined gas law, we assume that n=1 and this gives:

                       [tex]\frac{PV}{T}[/tex] = R

Therefore:

[tex]\frac{P_{1} V_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2} V_{2} }{T_{2} }[/tex]

Answer:

10.45

Explanation:

pH = -log [H+]  

pH = -log ( 3.5*10^-11)  

pH = 10.45

Answer:

10.45

Explanation:

Can cause a chemacal reaction

can i have brainliest i need it

Nuclear energy is formed by the splitting of a heavy atom into lighter atom the result of which is the release of energy in the process – this energy is the nuclear energy that binds the nucleons together. With many atoms in a single fuel rod, the energy amounts to millions and billions of orders of magnitude. This energy is released and used to heat water that turns to steam and used to move turbine generators that produce electricity.

Answer:

behind the root cap- A.

Answer:

see below

Explanation:

578

Answer:

a triangle

Explanation:

the name "triangular prism" has triangle in it, just like "rectangular prism" which has a rectangle as a base

Answer:

It’s actually DFG

Explanation:

DFBA

Answer:

31557600 seconds in a year or 3.1557600 * 10^7 in scientific notation

Answer:

Don't know. But need the answer

Explanation:

Answer:

C. Decreasing the temperature of the system.

Explanation:

Decreasing the temperature of the system increases the chance of a reaction when two  molecules collide.

The chance of a reaction when two molecules collide is increased by 'Increasing the concentration of the molecules', while the other options listed ('increasing the activation energy of the reaction', 'decreasing the temperature of the system', 'slowing down the speed of the molecules') actually decrease the chance of a reaction.

The chance of a reaction when two molecules collide can be increased via one or more of several methods, each corresponding to different options presented in your question. Option A. Increasing the concentration of the molecules, leads to more frequent collisions and thus a higher chance of reaction. Option B. Increasing the activation energy of the reaction, instead, makes reactions less likely because more energy is needed for the reaction to occur. Option C. Decreasing the temperature of the system also reduces the chance of reaction as it slows down molecular motion and thus collisions. Option D. Slowing down the speed of the molecules also decreases the chance of reactions as it reduces the frequency of collisions. Based on these considerations, only Option A. Increasing the concentration of the molecules increases the chance of a reaction when two molecules collide.

https://brainly.com/question/34137415

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Sulfur hexafluoride or SF6 is an inorganic, greenhouse gas. It is non-flammable, odorless, and colorless, and is an excellent insulator. It is a hypervalent octahedral molecule that has been an interesting topic of conversation among chemistry enthusiasts.

Hope this helps:)

SF₆ has six covalent bonds created by sp³ d² hybridization of the sulfur atom, forming a symmetrical octahedral structure with low reactivity.

The type of bond in SF₆ (sulfur hexafluoride) is a covalent bond. Specifically, the sulfur atom undergoes sp³ d² hybridization, allowing it to form six equivalent bonding pairs with the fluorine atoms. These bonds exhibit both sigma (σ) and pi (π) characteristics, as the S-F bond length is short, which is consistent with π-bonding in addition to σ-bonding.

This indicates that there are no lone pairs of electrons on the sulfur atom. The geometry displayed by SF₆ is highly symmetrical, forming an octahedron where all bond lengths and angles are identical, making it a nonpolar molecule with high symmetry and low reactivity. SF₆ is resistant to chemical attack and exhibits inert characteristics, which makes it useful in applications such as a spark suppressor.

The mass of 6.80 moles of H₂O, given H= 1.008 amu and O = 15.999 amu, is 122.502 grams. This was determined by first calculating the molar mass of H₂O and then using it to find the total mass. The molar mass of H₂O is 18.015 g/mol, calculated as 2 × 1.008 g/mol + 1 × 15.999 g/mol.

Step-by-Step Explanation

Calculate the molar mass of H₂O:

The molar mass of H₂O is calculated by adding the masses of its constituent atoms:

Molar mass of H₂O = 2(H) + 1(O)

Given H = 1.008 amu and O = 15.999 amu,

Molar mass of H₂O = 2 × 1.008 g/mol + 15.999 g/mol = 18.015 g/mol

Use the molar mass to find the mass of water:

We know that:

Number of moles (n) = 6.80 moles

Molar mass (M) = 18.015 g/mol

Mass (m) = n × M

Therefore, Mass = 6.80 moles × 18.015 g/mol = 122.502 g

The mass of 6.80 moles of H₂O is 122.502 grams.

Answer:

14 Electrons

Explanation:

I know because I know

Answer:

14 electrons can occupy the f sub level

Explanation:

Electronic configuration is the short representation which we use to represent the structure of an atom.

Atomic number of phosphorus is 15 so it has 15 electrons.

The electronic configuration of Phosphorus is given as [tex]1s^2 2s^2 2p^6 3s^2 3p^3[/tex]

Here the superscript number represents the electrons 2 + 2 + 6 + 2 + 3 = 15 electrons of Phosphorus

Orbital diagram too is used for this purpose.

A circle or a square is used to represent an orbital.

This is the orbital diagram of Radon (atomic number -86)  

Each orbital occupies 2 electron.

Shells are named using letters K, L, M, N and so on or using numbers 1, 2, 3, 4 etc.,

The number of electrons, a shell can accommodate is found using formula [tex]2n^2[/tex] where n is the number of the shell.

Shell 1 contains subshell s

Shell 2 contains subshell s, p

Shell 3 contains subshell s, p, d

Shell 4 contains subshell s, p, d, f

Subshells or sub level are represented by letters s, p, d, f, g, h, i and so on.

s contains 1 orbital with 2 electrons

p subshell contains 3 orbital with 6 electrons

d with 5 orbitals and 10 electrons  

f with 7 orbitals and 14 electrons.

(Answer)

Answer:

Explanation:

The equation can be rearranged to standard form.

  (y^2 -4y) -4(x^2 +2x) = 16

  (y^2 -4y +4) -4(x^2 +2x +1) = 16 +4 -4

  (y -2)^2 -4(x +1)^2 = 16

  (y -2)^2 /16 -(x +1)^2/4 = 1

This is of the form ...

  (y -k)^2/a^2 -(x -h)^2/b^2 = 1

where the transverse axis is 2a and the center is (h, k). Here, a=4, so 2a = 8.

The transverse axis is a vertical line segment of length 8, centered on (-1, 2).

Answer:A double convalescent bond is where two pairs of electrons are shared between the atoms rather than just one pair. Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram.

Explanation:

Answer:

Ion dipole force.

Explanation:

When sodium chloride is dissolved in water it dissociates into sodium ion and chloride ion.

Sodium ion has positive charge on it.

Chloride ion has negative charge on it.

In water molecule, due to electronegativity difference, hydrogen acquires a slightly positive charge and oxygen a slightly negative charge.

This creates a dipole in water molecule.

Now the force of attraction between water and NaCl is in between the ions and the dipole.

Thus the strongest intermolecular force of attraction between NaCl and water is Ion-dipole.

The correct answer is D. 396 kJ. ΔG will be negative for this value of TΔS indicating a spontaneous reaction.

Further Explanation:

A. -198 kJ FALSE because this gives a positive ΔG.

[tex]dG \ = \ 198 \ kJ \ - \ (-198 \ kJ) \\\boxed {dG = 396 \ kJ}[/tex]

B. 198 kJ FALSE because this results in ΔG = 0. The reaction is at equilibrium.

[tex]dG \ = \ 198 \ kJ \ - \ 198 \ kJ \\\boxed {dG = 0}[/tex]

C. 0 kJ FALSE because this results in a positive ΔG.

[tex]dG = 198 \ kJ \ - \ 0\\\boxed {dG = 198 \ kJ}[/tex]

D. 396 kJ TRUE because this results in a negative ΔG.

[tex]dG = \ 198 \ kJ \ - \ 396 \ kJ\\\boxed {dG = -198 \ kJ}[/tex]

Learn More

Keywords: Gibbs Free Energy, spontaneity

Answer:

Second Ionization energy

Explanation:

Let us write the reaction equation properly:

                  Ca⁺ → Ca²⁺ + e⁻

In the reaction above, we see that calcium goes from a single charge to being doubly charged by losing an electron.

Different atoms binds their valence electrons with different amount of energy. We must supply enough energy to remove the most losely held electrons in an atom. This amount of energy required is called the ionization energy.

The first ionization energy removes the outermost electron and makes the atom to become an ion.

First of all, as you seen the gases are noble which means that will not react with each other and in this case each gas create individual pressure.  

P[tex]_{T}[/tex]= total pressure  

P[tex]_{Ne}[/tex] = pressure of neon  

P[tex]_{Ar}[/tex] = pressure of argon  

P[tex]_{He}[/tex] = pressure of helium {which is required}

P[tex]_{T}[/tex] = P[tex]_{Ne}[/tex] + P[tex]_{Ar}[/tex] + P[tex]_{He}[/tex]    

1.25 = 0.68 + 0.35 +  P[tex]_{He}[/tex]

P[tex]_{He}[/tex]   = 1.25  - [0.68 + 0.35] = 0.22 atm

Answer:

Explanation:acid etching  

etching

the cutting of a hard surface such as metal or glass by a corrosive chemical, usually an acid, in order to create a design.

etching  - etching of dental enamel with an acid in order to roughen the surface, increase retention of resin sealant, and promote mechanical retention.

acid etching

microscopic roughening of dental enamel with an acid (usually phosphoric acid) to remove the smear layer and open enamel tubules, increase retention of resin sealant, and promote mechanical retention.

acid etching Dentistry

The application of a weak acid—e.g., 30% phosphoric acid—to the surface of enamel to roughen the surface of a tooth before bonding a resin or veneer; acid etching increases mechanical retention, cleans the enamel and improves the wetting of resins. See Cosmetic dentistry.

Acid etch typically involves dilute hydrofluoric acid or ammonium bifluoride for glass etching. Buffer mixtures, like acetic acid-acetate ion, need balanced components for effectiveness.

The usual composition of acid etch typically involves using potent acids that are capable of reacting with glass or metal surfaces to create art or clean materials. For glass etching, dilute hydrofluoric acid has been traditionally used, which slowly dissolves the silica to create intricate designs. In some cases, compounds like ammonium bifluoride may also be employed for etching purposes. While creating buffer mixtures for various chemical processes, it is essential to maintain close concentrations of the buffer components to ensure effectiveness. For instance, with an acetic acid-acetate ion buffer, a significant pH change is noted when the concentration of acetic acid drops to about 10% of the acetate ion concentration. The selection of acids and buffers depends on the specific application and desired pH level.

Answer:

ClO₃⁻ + 6I⁻ + 6H⁺ ⟶ Cl⁻ + 3I₂ + 3H₂O

Explanation:

Step 1. Write the skeleton equation

ClO₃⁻ + I⁻ ⟶ I₂ + Cl⁻

Step 2. Separate into two half-reactions.

ClO₃⁻ ⟶ Cl⁻

      I⁻ ⟶ I₂

Step 3. Balance all atoms other than H and O

ClO₃⁻ ⟶ Cl⁻

   2I⁻ ⟶ I₂

Step 4. Balance O by adding H₂O molecules to the deficient side.

ClO₃⁻ ⟶ Cl⁻ + 3H₂O

   2I⁻ ⟶ I₂

Step 5. Balance H by adding H⁺ ions to the deficient side.

ClO₃⁻ + 6H⁺ ⟶ Cl⁻ + 3H₂O

              2I⁻ ⟶ I₂

Step 6. Balance charge by adding electrons to the deficient side.

ClO₃⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3H₂O

                        2I⁻ ⟶ I₂ + 2e⁻

Step 7. Multiply each half-reaction by a number to equalize the electrons transferred.

1 × [ClO₃⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3H₂O]

3 × [                         2I⁻ ⟶ I₂ + 2e⁻]

Step 8. Add the two half-reactions.

        ClO₃⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3H₂O

                                6I⁻ ⟶ 3I₂ + 6e⁻                      

ClO₃⁻ + 6I⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3I₂ + 3H₂O + 6e⁻

Step 9. Cancel species that occur on each side of the equation

ClO₃⁻ + 6I⁻ + 6H⁺ + 6e⁻ ⟶ Cl⁻ + 3I₂ + 3H₂O + 6e⁻

becomes

ClO₃⁻ + 6I⁻ + 6H⁺ ⟶ Cl⁻ + 3I₂ + 3H₂O

Step 10. Check that all atoms are balanced.

[tex]\begin{array}{ccc}\textbf{Atom} & \textbf{On the left} & \textbf{On the right}\\\text{Cl} & 1 & 1\\\text{O} & 3 & 3\\\text{I} & 6 & 6\\\text{H} & 6 & 6\\\end{array}[/tex]

Step 11. Check that charge is balanced

[tex]\begin{array}{rl}\textbf{On the left} & \textbf{On the right}\\6+ + \; 7- = & 1-\\1- =& 1-\\\end{array}[/tex]

Everything checks. The balanced equation is

ClO₃⁻ + 6I⁻ + 6H⁺ ⟶ Cl⁻ + 3I₂ + 3H₂O

The balanced equation is: ClO₃⁻(aq) + 5I⁻ (aq) + 6H⁺ → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)

To balance the given equation using the half-reaction method in an acidic solution, we need to balance each half-reaction separately and then combine them.

Step 1: Balance the atoms other than hydrogen and oxygen.

The given equation already has the same number of iodine and chlorine atoms on both sides.

Step 2: Balance the oxygen atoms by adding water molecules.

ClO₃⁻(aq) + I⁻ (aq) → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)

Step 3: Balance the hydrogen atoms by adding hydrogen ions (H⁺).

6H⁺ + ClO₃⁻(aq) + I⁻ (aq) → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)

Step 4: Balance the charges by adding electrons (e⁻).

6H⁺ + ClO₃⁻(aq) + 5I⁻ (aq) → I₂ (s) + Cl⁻ (aq) + 3H₂O(l) + 6e⁻

Step 5: Combine the half-reactions to get the balanced equation.

Since the number of electrons lost and gained are equal, we can combine the half-reactions to get the balanced equation:

ClO₃⁻(aq) + 5I⁻ (aq) + 6H⁺ → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)

Therefore, the balanced equation is:

ClO₃⁻(aq) + 5I⁻ (aq) + 6H⁺ → I₂ (s) + Cl⁻ (aq) + 3H₂O(l)

Answer:

D, ABC, C, A, ?, B, A, ?, B, C, D, D, C, D

Explanation:

(Answers and explanations in order of questions)

Fission reactions are when the nucleus of an atom splits producing smaller nuclei and energy

Lack of space isn't a safety risk

Coal, natural gases, and oil all are burned to create energy which releases carbon into the atmosphere, polluting it. Nuclear power doesn't burn carbon-based substances and so is fine

I dunno but C and D are wrong

All of them are technically renewable?

Geothermal energy uses the Earth's heat, hence the name

Nothing can happen if people ignore it

Unsure

Synthetic polymers are plastics, which do not decay naturally

A base would react with the acid to neutralise it which is the fastest way to improve the lake

Not pesticides?

Oil spills kill aquatic animals and life quickly, which causes huge damage to ecosystems

If nothing changes nonrenewable things will run out and bad practices will have caused irreparable damage worldwide

Big factories are pumping out the bad stuff

Answer:

1)D) Fission is the process when the nucleus of an atom splits after being bombarded by neutrinos.

2)A) Storage and disposal of radioactive waste is a problem all nuclear power plants face. Most of them dipose the waste underneath the ground. There have even been proposals to send the nuclear waste to the moon.

3)C) Nuclear Power because it does not produce greenhouse gas emissions.

4)A) Oil is more difficult to remove from the Earth than coal This is why, to extract oil, you need an extraction pump and other equipment, while coal can be removed from the earth after digging.

5)A) biofuel - because it comes from agriculture, and agriculture is the biggest contributor to worldwide greenhouse emissions.

6)B) Geothermal power - geothermal power uses the heat from the earth to produce energy.

7)D) - Humans have seemingly unlimited needs and these needs have to be met without destroying the enviroment.

8)C) Xenon - The other three substances listed are classified as Ozone depleting susbstances according to the Ministry of the Enviroment in New Zealand.

9)B) Synthetic materials often do not decay naturally - The best example is plastic, which is a synthetic material that takes hundreds or even thousands of years to decay.

10)C) An environmentally safe base to neutralize the lake - This can be done by oxygenizing the lake.

11)D) Oil spills - Unfortunely, these events have taken place many times. The oil spill in the Gulf of Mexico caused by British Petroleum greatly affected the coasts and waters of Louisiana.

12)D) The whole ecosystem is negatively affected, and long-term damage may occur - An oil spills afects aquatic plants, animals, birds, and the water itself.

13)B) Natural resources will be depleted - Oil might even run out completely. Besides, climate change would raise the sea levels and flood thousands of cities.

14)D) factories and power plants - especially thermal power plants that burn coal to produce energies.

Answer:

0.193 M to the nearest thousandth.

Explanation:

Molar mass of copper (ii) chloride

= 63.546 + 2* 35.45

= 134.446 g.

So in 2.60L of 1  M solution  there is 134.446 * 2.6

= 349.56 g of copper chloride.

So the molarity of our solution is  67.3 / 349.56

= 0.193 M.

Answer:

(D) all of the above

Explanation:

The light reactions stage, occurs before the Calvin cycle, requires light energy to work, and releases oxygen through the stomata.

The light reactions stage occurs before the Calvin cycle , requires light energy to work  and releases oxygen through the stomata.

Answer: D) all the above

Explanation

The light reactions stage is one of the two stages which occur during the chemical reaction of photosynthesis.

It is the first stage and second stage is Calvin cycle. So the first option is true which states that the light reactions stage occurs before the Calvin cycle.

In light reactions stage, the light energy of sun is captured by the chloroplast and this energy is the main trigger for starting the light reaction stage between the reactants carbon-di-oxide and water.

So the second option is also true i.e., the light reactions require light energy to work.

In light reaction stage, the water molecules will release oxygen gas from the stomata.

Thus all the options are true for light reactions stage in photosynthesis.

Answer:

Volume = (0.62 m)^3

Explanation:

If the density of silver is 10.5 g/cm, the volume of the silver is (0.62 m)^3.

Final answer:

The volume of the silver metal with a mass of 3.687 grams and a density of 10.5 g/cm³ is approximately 0.3511 cm³.

Explanation:

The question is asking to calculate the volume of a piece of silver metal given its mass and the density of silver. To find the volume, you can use the formula Volume = Mass / Density. Given that the mass of the silver metal is 3.687 grams and the density of silver is 10.5 g/cm3, you can calculate the volume as follows:

Volume = 3.687 g / 10.5 g/cm3

Volume = 0.3511 cm3

Therefore, the volume of the silver is approximately 0.3511 cm3.

Answer:

This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.

Explanation:

Experiment using the gas discharge tube by J.J Thomson led to the discovery of cathode rays which are now known as electrons.

Primarily, Thomson's experiment led to the discovery of cathode rays, electrons, as subatomic particles.

If the size of the atoms observed at the cathode is the same as that of the rays,we can conclude that the particles of the rays are the simplest form of matter we can have. This would suggest that the atom is indeed the smallest indivisible particle of a matter according to Dalton.

Answer:

This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.

Explanation:

Dalton proposed that all matter is made up of atoms. Atoms are indivisible. But Thompson’s cathode ray experiment proved that the cathode rays are made up of negatively charged particles which were deflected by both electric and magnetic field. This caused Thompson to propose the Plum and Pudding model of the atom.

Answer:

1.4

Explanation:

35 times .5 =25 times C. you have to get C by itself so you would have to do 35 times .5 and you get 17.5, than ÷ it by 25 and you get 1.4

Answer:

b. 0.70 M HCl is the Answer

Explanation:

Molarity (M),  Molality (m), Normality (N),  Mass %,  Parts per million(ppm), billion(ppb), thousands(ppt)  are some of the terms we use to represent the concentration of the solution that is to represent the amount of solute present in a solvent.

The Balanced Chemical equation is :

[tex]NaOH + HCl > NaCl + H_2 O[/tex]

Molarity is moles of solute present in 1L of the solution. The formula to find Molarity is

[tex]Molarity  = \frac {(moles solute)}{(volume of solution in L)}[/tex] and its unit is mol/L

Rearranging the formula

We get                          

Moles = Molarity × Volume

Plugging in the values  

[tex]moles of NaOH=0.50M\times35mL (M=mol/L)[/tex]

[tex]=0.50 mol/L \times 0.035L=0.0175 moles NaOH[/tex]

Mole ratio of NaOH: HCl is 1:1  

So moles of NaOH = moles of HCl  = 0.0175moles

So,

[tex]Molarity  = \frac {(moles solute)}{(volume of solution in L)}[/tex]

[tex]=\frac {0.0175mol}{25mL}\\\\=\frac {0.0175mol}{0.025L}\\\\=0.70M[/tex]

(Answer)