1:Which example is not a physical change?

2: Which of the following is not a clue that a chemical reaction is taking place?

Answer:

I'm not sure,

Explanation:

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Answer:

Tri.

Explanation:

''Tri'' is the Greek prefix used to represent the CH3 because there are three hydrogen atoms to form the covalent compound so in Greek method ''Tri'' is used for three. In Greek system, there are certain names for prefixes such as ''di'' is used for two, ''tri'' is used for three, ''tetra'' is used for four etc. This method only provides information about the number of atoms that form the covalent compound.

Answer:

K = 6.25x10⁻⁴

Explanation:

Based on the reaction:

SO₂ + 1/2 O₂ ⇄ SO₃ Kp = 2.5x10⁻²

We can find the Kp of a similar reaction using Hess's law where the sum of 2 reactions a and b produce a K that is:

K = Ka*Kb

The sum of twice the reaction of the problem:

SO₂ + 1/2 O₂ ⇄ SO₃

+ SO₂ + 1/2 O₂ ⇄ SO₃

2SO₂ + O₂ ⇄ 2SO₃

Where K must be:

K = Kp*Kp = Kp²

K = (2.5x10⁻²)²

Answer:

25.4

Explanation:

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Answer:

Your correct.

Explanation:

Answer:

The answer is C.

Explanation:

I just know.

The question is incomplete, the complete question is shown in the image attached to this answer

Answer:

See Explanation

Explanation:

I want us to bear something in mind. A compound is polar when there is a considerable difference in electronegativity between two bonding atoms in the molecule.

The implication of this is, the shared electron pair of the bond will be closer to the atom of greater electronegativity than the atom of lesser electronegativity thereby creating a dipole in the molecule.

Let us consider each of the compounds;

For Cl-F, the highlighted bond is polar and F is the more electronegative atom

For H-Br, the highlighted bond is polar and Br is the more electronegative atom

For N≡N, the highlighted bond is nonpolar since it is a homonuclear diatomic molecule.

Answer:

a

Explanation:

Answer:

The correct answer is a

A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct

Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature.

The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property.

Therefore, A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct.

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Answer:

Diffusion means that particles travel from a higher concentration to a lower concentration region before balance is achieved. The semi-permeable membrane is present in osmosis, so that only solvent molecules can travel freely to equalize the levels.

Answer:

132.15

Explanation:

Molar mass N = 14.00

Molar mass H = 1.01

Molar mass H4 = 1.01 x 4 = 4.04

Molar mass NH4 = 14.00 + 4.04 = 18.04

Molar mass (NH4)2 = 18.04 x 2 = 36.08

Molar mass S = 32.07

Molar mass O = 16.00

Molar mass O4 = 16.00 x 4 = 64.00

Molar mass SO4 = 32.07 + 64.00 = 96.07

Molar mass (NH4)2SO4 = 36.08 + 96.07 = 132.14

Answer:

The rock cycle is driven by two forces: (1) Earth's internal heat engine, which moves material around in the core and the mantle and leads to slow but significant changes within the crust, and (2) the hydrological cycle, which is the movement of water, ice, and air at the surface, and is powered by the sun.

Explanation:

Answer:

I think its false

Explanation:

Answer:

0.0395 mol NaCl

Explanation:

¡Hola!

En este caso, es necesario para nosotros considerar que las relaciones masa-mol se desarrollan teniendo en cuenta las masas molares de los compuestos involucrados en el sistema. Ahora, dado que este sistema se compone de NaCl, cloruro de sodio como sal de mesa, es posible saber que la masa molar de este es alrededor de 58.44 g/mol.

De esta manera, las moles en 2.31 g se calculan como sigue:

[tex]=2.31gNaCl*\frac{1molNaCl}{58.44gNaCl}\\\\=0.0395molNaCl[/tex]

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Answer:

1s2 2s2

Explanation:

Answer:

a thermal conductor

Explanation:

thats what its called

Answer:

A "chaser," a high-boiling compound whose vapors will displace the vapors of the desired low-boiling compound, can be used to distill a small amount of compound.

A smaller fractionation apparatus or a Vigreux column could be used instead.

Explanation:

Explanation:

The purpose of this seven-page lab report is to use simple and fractional distillation to purify volatile liquids. The boiling points were obtained from the distillate collected drops and the efficiency of the two methods of purification were compared. The introduction experiment, data, conclusion

Answer:

Strong base

Explanation:

Anhydrous sodiumtrioxocarbonate(IV) Na2CO3 and crystalline sodiumtrioxocarbonate(IV) Na2CO3 are two forms of sodiumtrioxocarbonate(IV) Na2CO3. The Solvay process is the most common name for the sodiumtrioxocarbonate(IV) Na2CO3 production process.

Still, as Na2CO3 reacts, it produces CO3. That tends to be a weak acid's conjugate base. As a result of the removal of H+, carbonic acid was formed (Strong Base)

Answer:

2.00X10^5 x 20gNe/6.02x10^23=6.46x10^-18 but books answer is 797.

Explanation:

The mass is grams 2.00 x 10⁵ atoms of naturally occurring neon is 6.70 x 10⁻¹⁸g.

Neon is a chemical element in the periodic table. Its atomic number is 10, and it is a Nobel gas. It is a colorless, monatomic, and odorless gas.

Mass is the quantity of matter in a physical body. It can be calculated by the volume and density of the element. The mass can be calculated by the number of atoms.

Given the number of atoms of Ne is 2.00 x 10⁵

The molar mass Ne = 20.18 g/mol

6.022 x 10²³ Ne atoms have a mass of 20.18 g.

The number of atoms is divided by the Avogadro number and the mass of the element.

2.00 x 10⁵ atoms Ne has mass = (2.00*10⁵) / (6.022*10²³) x 20.18 g =

6.70 x 10⁻¹⁸g.

Thus, the mass is grams 2.00 x 10⁵ atoms is 6.70 x 10⁻¹⁸g.

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Answer:

110.92 g

Explanation:

Amount of Ni2O3 consumed= 55.3/59 =0.94 moles

From the reaction equation;

2 moles of Ni2O3 yields 4 moles of Ni

0.94 moles yields 0.94 moles * 4/2

= 1.88 moles of Ni2O3

Mass of 1.88 moles of Ni2O3 = 1.88 moles of Ni2O3  *  59 gmol-1 = 110.92 g

Answer:

305.15

Explanation:

32 celsius converted to kelvin is 305.15 kelvin

Formula

32°C + 273.15 = 305.15K

Answer:

See Explanation

Explanation:

Let us recall that;

[H^+] [OH^-] = 1 * 10^-14

Where;

[OH^-] = 1 x 10^-11

Then;

[H^+] = 1 * 10^-14/1 x 10^-11

[H^+] = 1 * 10^-3

pH = -log [H^+]

pH = -log(1 * 10^-3)

pH = 3

Also;

pH + pOH = 14

pOH = 14 - pH

pOH = 14 -3

pOH = 11

Answer: the c thingy is where you be like burgundy sauce then be like racial slair is what it mean's so the name thingy

Explanation:

test tube 1 does not rust because boiled water has no oxygen and oil stops new oxygen from entering and without oxygen iron cannot rust.

test tube 2 does not rust because the drying agent absorbs all the moisture from air, and moisture is required for iron to rust.

In the absence of oxygen or moisture rusting of the nail can not take place.

There are two very important things that must be present for the process of rusting to take place these are;

If we can exclude these two, rusting will not take place in the absence of either of them.

Rusting does not occur in tube 1 because the water have been boiled and the oxygen removed then it is stored under oil that prevents corrosion.

In tube 2, there is a drying agent that removes moisture from air hence moisture does not have access to the nail so it does not rust.

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Answer: [tex]m=0.1625\ kg,\ ,V=125\ L[/tex]

Explanation:

Given

The length of the box is [tex]a=0.5\ m[/tex]

1 liter of air has a mass of 1.3 gm

So, the density of air is [tex]1.3\ g/L[/tex]

The volume of the box is

[tex]\Rightarrow a^3=0.5^3\\\Rightarrow 0.125\ m^3\ or\ 125\ L[/tex]

Mass of air in the box is

[tex]\Rightarrow m=\rho \times V\\\Rightarrow m=1.3\times 125\\\Rightarrow m=162.5\ gm\ or\ 0.1625\ kg[/tex]

Answer:

3.93 × 10²¹ molecules

Explanation:

Convert 1.98 grams of PbSO₄ to molecules.

Step 1: Given data

Mass of PbSO₄: 1.98 g

Step 2: Calculate the number of moles corresponding to 1.98 g of PbSO₄

The molar mass of PbSO₄ is 303.26 g/mol.

1.98 g × 1 mol/303.26 g = 6.53 × 10⁻³ mol

Step 3: Calculate the number of molecules in 6.53 × 10⁻³ moles of PbSO₄

To convert moles to molecules, we need a conversion factor: Avogadro's number. There are 6.02 × 10²³ molecules of PbSO₄ in 1 mole of molecules of PbSO₄.

6.53 × 10⁻³ mol × 6.02 × 10²³ molecules/1 mol = 3.93 × 10²¹ molecules

Answer:

1083.6 g

Explanation:

At STP, 1 mol of any given mass will occupy 22.4 L.

With the information above in mind we can calculate how many moles of nitrogen gas (N₂) are there in 867 L:

Finally we convert 38.7 moles of N₂ into grams, using its molar mass:

Answer:

5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O

Explanation:

Fe⁺² + MnO₄⁻ +  H⁺ => Mn⁺² + Fe⁺³ +  H₂O

5(Fe⁺² => Fe⁺³ + 1e⁻)      =>                        5Fe⁺² => 5Fe⁺³ + 5e⁻

MnO₄⁻ + 5e⁻ => Mn⁺²    =>   MnO₄⁻ + 8H⁺ + 5e⁻ => Mn⁺² + 4H₂O

                                      =>  5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O

Answer:

Any atom with six protons, regardless of how much other stuff it has, is a carbon atom. Having 7 neutrons, this would be an atom of Carbon 13 (C-13), a stable isotope of carbon making up 1.1% of natural carbon in the atmosphere and near the Earth's surface. As for the electrons, Carbon has six, but atoms may temporarily pick up or lose electrons in the hurly burly of chemical reactions, solar radiation and so forth. This is a negative ion of C13, which will soon pass on its extra election to an atom which needs it (a positive ion).

Explanation:

https://www.quora.com/What-element-has-6-protons-7-neutrons-and-7-electrons

Answer:

I don't speak espanol

Explanation:

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