A 25.0 g sample of metal at
16.0 °C is warmed to 22.1 °C
by 259 J of energy.
What is the change in temperature
for the metal?

Answer:

Tin bromine = Snbr2

aluminum fluorate = AlFe3

iron oxide = Fe2o3

potassium chloride = KCL or 2KCL = K2CL2

All Pairs are correct

Answer: a. hydrogen

This is a fact.

Carbon is the reference taken to assign the atomic mass unit

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The percent yield of the reaction is 63.4%; option D

Percent yield of a reaction is given as:

Actual yield of the reaction = 0.856 g

Expected yield = 1.8/32 * 4/5 * 30 = 1.35 g

Percent yield = 0.856/1.35 * 100 % = 63.4 %

Therefore, the percent yield is 63.4%.

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Answer:

6) 47588

4.7 * 10 power 4 ( by rounding off)

7) 1 mm ---> 1,000,000

? 120

120 * 1 / 1000000

12/ 100000

0.0012

1.2 * 10 power -4.

8) Volume is the amount of space something occupies

Answer:

93.5 moles N₂

Explanation:

To find the moles, you need to use the Ideal Gas Law. The equation looks like this:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = number of moles

-----> R = constant (0.0821 atm*L/mol*K)

-----> T = temperature (K)

You can plug the given values into the equation and simplify to find moles. The final answer should have 3 sig figs to match the lowest number of sig figs among the given values.

P = 95.0 atm                  R = 0.0821 atm*L/mol*K

V = 224 L                       T = 2773 K

n = ?

PV = nRT

(95.0 atm)(224 L) = n(0.0821 atm*L/mol*K)(2773 K)

21280 = n(227.6633)

93.5 = n

Answer:

93.5 moles N₂

Explanation:

You can plug the given values into the equation and simplify to find moles. The final answer should have 3 sig figs to match the lowest number of sig figs among the given values.

P = 95.0 atm                  R = 0.0821 atm*L/mol*K

V = 224 L                       T = 2773 K

n = ?

PV = nRT

(95.0 atm)(224 L) = n(0.0821 atm*L/mol*K)(2773 K)

21280 = n(227.6633)

93.5 = n

Explanation:

Answer:

CO_(2)` molecules removed `= 10^(21)` <br> No. of `CO_(2)` molecules left `= 2.74 xx 10^(21) - 10^(21) = 1.74 xx10^(21)` <br>

Explanation:

Answer:

0.893mol

Explanation:

n = m ÷ M

= 275 ÷ (23 + 80)

= 2.67 mol

* now use the Mol ratio *

NaBr : FeBr3

6 : 2

2.67 : x

5.67 = 6x

n( FeBr3 ) = 0.893 mol

Answer:For jewellery and ornaments, gold, platinum and silver are being used.

For building purposes, iron and steel can be used.Iron and aluminium are used as utensils.

The thermometer uses mercury and helps to monitor the temperature.

The insulation wires are made of aluminium.

Aluminium foils are being used as wrappers for food.In sweets, a silver foil is being used.

To avoid rusting, zinc is used for galvanizing.In vehicles, iron is being used.

For making cable wires, copper is being used.

Explanation:

Answer:

1. For jewellery and ornaments, gold, platinum and silver are being used.

2. For building purposes, iron and steel can be used.

3. Iron and aluminium are used as utensils.

4. The thermometer uses mercury and helps to monitor the temperature.

5. The insulation wires are made of aluminium.

6. Aluminium foils are being used as wrappers for food.

7. In sweets, a silver foil is being used.

8. To avoid rusting, zinc is used for galvanizing.

9. In vehicles, iron is being used.

10. For making cable wires, copper is being used.

Iced tea's energy increases while the energy of the glass decreases.

Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other forms

Iced tea's energy increases while the energy of the glass decreases because the ice is getting warmer so the glass is also getting warmer. meaning that the glass is decreasing in energy while the ice tea is increasing in energy.

Hence, iced tea's energy increases while the energy of the glass decreases.

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Answer:

Electric current

Definition:

The time rate of flow of electric charge, in the direction that a positive moving charge would take and having magnitude equal to the quantity of charge per unit time: measured in amperes.

Everything begins inside in the battery. The battery's zinc metal undergoes oxidation; here is where the flow of electrons into the conductors begins. Electrical field attraction will lead the wire's existing electrons to move towards the battery's positive terminal, and the loose electrons caused by the zinc metal will begin to fill the wire's empty spaces. process continues until the zinc metal's oxidation ceases. At rechargeable batteries, the oxidation-reduction process is also reversed by charging the battery, allowing the stored electrons in the positive terminal to flow back to the zinc metal's negative terminal.

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Answer:

C.) 4.85 x 10⁻¹⁹ J

Explanation:

To find the energy, you need to use the following equation:

E = hc / w

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> c = speed of light (3.00 x 10⁸ m/s)

-----> w = wavelength (m)

Once you have converted nanometers to meters, you can plug the given values into the equation and solve.

410 nm                1 m
-------------  x  ----------------------  =  4.10 x 10⁻⁷ m
                        1 x 10⁹ nm

E = hc / w

E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)

E = 4.85 x 10⁻¹⁹ J

Answer:

9.519e^-2

Explanation:

To accurately show the number in scientific notation, you need to move the decimal place to the left 2 spaces. Because you are moving the decimal place to the left, the exponent will be a negative number. Because the decimal place moves 2 units to the left, the exponent will be a -2.

Therefore, the answer in correct scientific notation is:

951.9 ----------> 9.519e^-2

Answer:

b

Explanation:

b is the ketone because it is and that's a fact

Answer:

D

Explanation:

Ketones are a class of organic compounds that have an Oxygen double bonded to the middle of the main carbon chain.

Option A is not a ketone (despite having an Oxygen double bonded to the middle of the main carbon chain) because it has an adjacent single bonded Oxygen in the main carbon chain.  This type of compound is classified as an "Ester".

Option B is not a ketone, but is instead classified as an aldehyde, a group of compounds with their Oxygen double bonded at the end of the main carbon chain.

Option C is not a ketone (despite having an Oxygen double bonded to the middle of the main carbon chain), but is instead classified as an Carboxylic Acid, because it has an adjacent single bonded Oxygen in the main carbon chain, and both of these pieces (with the single bonded O pointing outward) are at the end of the main carbon chain.

Option D is a ketone because it does have an Oxygen double bonded somewhere to the middle of main carbon chain, not at an end, and not with another Oxygen single bonded adjacently in the carbon chain.  Specifically, this ketone is "2-pentanone" or "methyl propyl ketone"

Answer:

chemical because it turned into a new compound

Explanation:

is zinc and hydrogen chloride combining into zinc chloride and hydrogen gas a chemical or physical change?​

physical change is like  boiling, melting, freezing, and shredding

but its still the same compound

chemical is like it turns into something else like a new compound

Zn + 2HCl = ZnCl2 + H2(g)

Metal + Acid → Hydrogen + Acid Anion

new compound forms in this reaction

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Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.

When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.

Answer:

B

Explanation:

The answer is B, O2

O₂ is the limiting reagent.

A limiting reactant is described as the one that will be consumed first in a chemical reaction.

C₁₀H₈ + 12O₂ → 10CO₂ + 4H₂O

Given, Mass of O₂ = 23.3 g

           Mass of C₁₀H₈ = 18.3 g

Molar mass of O₂ = 32 g

No. of moles of O₂ = 32/23.3 = 1.4 moles

Molar mass of C₁₀H₈ = 128 g

No. of moles of C₁₀H₈ = 128/18.3 = 6.9 = 7 moles

According to the equation,

1 mole of C₁₀H₈ yields 10 moles of CO₂. So, 7 moles of C₁₀H₈, give 70 moles of CO₂.

12 moles of O₂ yields 10 moles of CO₂. So, 1.4 moles of O₂ give 1.16 moles of CO₂.

We do know, however, that based on our balanced equation, if we were to totally react all 1.4 moles of O2, we could only produce a maximum of 1.16 moles of CO2. Even while there is enough C10H8 to generate more, the amount of O2 we have is a limiting factor because it will be consumed first.

So, our limiting reactant is O₂.

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The temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.

The temperature of a given gas can be calculated using the ideal gas law equation:

PV = nRT

Where;

P = pressure = 1.00 atm

V = volume =2.50 L

R = gas law constant = 0.0821 Latm/molK

Mass =1.00 gram

The molar mass of Ne= 20.1797 u

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{1.00}{20.1797}[/tex]

Moles = 0.049mol

T = temperature=?

Putting the value in the equation:

PV = nRT

1.00 atm × 2.50 L = 0.049mol × 0.0821 × T

T = 621.44K

Therefore, the temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.

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Answer:

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100. Here, the quantity is measured in terms of grams of the elements present.

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If the earth is completely an oxidizing atmosphere, materials would ignite spontaneously when they are exposed to air.

Let us recall that oxidation has to do with an increase in oxidation number. If the earth is left as an oxidizing atmosphere without any attenuation, we can not have pure substances.

Secondly, materials would ignite spontaneously when they are exposed to the oxidizing atmosphere of the earth.

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The most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.

The rate of reaction is the rate at which reactants are converted into products or the rate at which the reactants disappear.

Given that the reaction is a colorimetric reaction, the most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.

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Answer: C

Explanation:

iron sulfide.

Answer:

C. Iron sulfide

Explanation:

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Answer:

Calcite

Explanation:

When in contact with hydrochloric acid, calcite releases carbon dioxide gas.

Answer:

n

Explanation:

nobody knows

Answer:

B. the reaction absorbs energy (+ or endothermiic)

The label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.

Isotopic labelling is one of the methods by which a chemical reaction is studied. In this case, we can see that the reaction occurs with the hemiacetal reacting with a labeled methanol.

By looking at the reaction products we can see that the label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.

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This happens because the beaker is open.

The Law of Mass Conservation says that in a close system all the mass and energy should be the same.

If the system is open, as in the case, we can have loss of mass, due to formation of gas, that will leave the beaker to the environment, and we can also have loss of energy, because the system will exchange the energy, as heat, with the environment, causing a loss on the total energy.

Answer:

Its C its C its C

Explanation:

i dislike expert verifeid beacause he wont say C

+3

Hence, the magnetic behaviour of the complex is paramagnetic. The oxidation number of the central metal atom: The oxidation number of the metal iron is +3.

Answer:

the oxidation number of iron in the complexion is +3 or x=+3