Carbon dioxide gas at a temperature of 35.0 C and a volume of 281mL. Determine the volume of the gas when the temperature of the gas is raised to 125 C if the pressure remains constant.

Answer:

I think the answer is Temperature but i don't know your options so I'm just going off of my test

Explanation:

Answer:

The number of valence electrons is the number of electrons in the outer shell, that the atom uses for bonding. Nitrogen has 5 electrons in its n=2 (outer) shell. There is a quick way of identifying the number of valence electrons - it is the same as the Group number.

Explanation:

Answer:

Empirical formula is Na₂CO₃

Molecular formula is Na₂CO₃

Explanation:

Percentage compositions of the elements;

Sodium = 46%

Carbon = 12 %

Oxygen = 42%

To determine empirical formula, we calculate the mole ratio first.

mole ratio =  % mass/atomic mass; where the atomic masses of the elements are :  Na = 23 u, C = 12 u and O = 16 u.

mole ratio: Na = 46/23; C = 12/12; O = 42/16

mole ratio (Na : C : O) = 2 : 1 : 2.6

approximate mole ratio = 2 : 1 :3

Therefore, empirical formula of compound is Na₂CO₃

To determine the molecular formula;

molecular formula or mass = n(empirical formula or mass)

n = molecular mass/empirical mass

molecular mass = 106 u,

empirical mass = 23*2 + 12 + 16*3 = 106 u

then, n = 106/106 = 1

therefore, molecular formula = 1 * (Na₂CO₃) = Na₂CO₃

Answer:

54.1°C

Explanation:

Now we have the following parameters from the question;

Heat applied (H)= 18.0×10^3 Joules

Mass of the water(m)= 250g= 0.25Kg

Initial temperature of the water (θ1)= 37°C

Final temperature of the water (θ2)= the unknown

Heat capacity of water (c) = 4200JKg-1

From ;

H= mc(θ2-θ1)

Substituting values appropriately

18×10^3= 0.25 × 4200(θ2-37)

18×10^3 = 0.25 × (4200θ2 - 155400)

18×10^3 = 1050θ2 - 38850

18×10^3 + 38850 = 1050θ2

56850 = 1050θ2

θ2= 56850/1050

θ2= 54.1°C

Answer:

The density is 0.0187 g/L

Explanation:

First thing to do here is to calculate the Volume of 1 mole of CO2 using the ideal gas equation

Mathematically;

PV = nRT

thus V = nRT/P

what we have are;

n = 1 mole

R is the molar has constant = 0.082 L•atm•mol^-1•K^-1

P is the pressure = 0.0079 atm

T is temperature = 227 K

Substituting these values, we have;

V = nRT/P = (1 * 0.082 * 227)/0.0079

V = 2,356.20 dm^3

This means according to the parameters given in the question, the volume of 1 mole of carbon iv oxide is 2,356.20 dm^3

But this is not what we want to calculate

What we want to calculate is the density

Mathematically, we can calculate the density using the formula below;

density = molar mass/molar volume

Kindly recall that the molar mass of carbon iv oxide is 44 g/mol

Thus the density = 44/2356.20 = 0.018674136321195 which is approximately 0.0187 g/L

Answer:

4m/s² north.

Explanation:

Data obtained from the question include the following:

Mass (m) = 10Kg

Force (F) = 40N North.

Acceleration (a) =...?

Force is simply the product of mass and acceleration. It is represented mathematically as:

Force (F) = Mass (m) x acceleration (a)

F = ma

With the above formula, we can obtain the acceleration of the object as follow:

40 = 10 x a

Divide both side by 10

a = 40/10

a = 4m/s²

Since the force was applied in the north direction, the object will also accelerate in the north direction. Therefore, the acceleration of the object is 4m/s² north.

Answer:

A battery

Explanation:

A battery is a device which converts chemical energy into electrical energy . Most batteries operate as chemical cells. It is the redox reactions taking place inside the battery that causes electric current to flow via the terminals of the battery to an external circuit.

There are two main types of batteries, viz;

Rechargeable batteries

Non rechargeable batteries

A rechargeable battery is recharged by passing electric current in the reverse direction through the battery; it can be used multiple times to produce electricity in order to power devices. An example of a rechargeable battery is the Lithium-ion battery used in laptops and cell phones.

A non rechargeable battery will give electricity until the chemicals present it are used up(the chemical reactions producing electrical energy attain equilibrium). An example of a non rechargeable battery is a dry cell.

Answer:

7

Explanation:

1/3 of 21 is also the same as 21/3, which is 21 divided by 3

So the right answer is 7.

please see attached picture for full solution

hope it helps

Good luck on your assignment

Answer:

The enthalpy change (∆H) for the reaction is -108.7 kJ

Explanation:

Hess's law can be stated as: when the reactants are converted to products, the enthalpy change is the same, regardless of whether the reaction is carried out in one step or in a series of steps. Then, Hess's Law states that the enthalpy of one reaction can be achieved by algebraically adding the enthalpies of other reactions.

So,  to calculate the ∆H (heat of reaction) of the combustion reaction, that is, the heat that accompanies the entire reaction, you must make the total sum of all the heats of the products and of the reagents affected by their stoichiometric coefficient ( number of molecules of each compound participating in the reaction) and finally subtract them.

Enthalpy of combustion = ΔH = ∑Hproducts - ∑Hreactants

2 ClF + O₂ → Cl₂O + F₂O ∆H=167.4kJ

Cl₂O + 3 F₂O → 2 ClF₃ + 2 O₂ ∆H= -341.4kJ  

The previous equation must be inverted, and the enthalpy value is also inverted, that is, the sign is changed.

2 F₂ + O₂ →2 F₂O ∆H=-43.4kJ

Reactants and products are added or canceled, taking into account that certain substances sometimes appear as a reagent and others as a product, so they are totally eliminated (there is nothing left of them anywhere in the reaction, if the same amount in reagents and products) or partially (this substance remains, in less quantity, only on one side), obtaining:

2 ClF + 2 F₂ → 2 ClF₃

Then, as all the reactants and products have a stoichiometric coefficient of 2, dividend by that number is obtained:

ClF + F₂ → ClF₃

Adding the enthalpies algebraically, and dividing by 2, because to get the "data" reaction you had to multiply by two, you get:

ΔH= [167.4 kJ - 341.4 kJ - 43.3 kJ]÷2

ΔH= -108.7 kJ

The enthalpy change (∆H) for the reaction is -108.7 kJ

Answer:

Ag is under going reduction

Answer:

72.8°C

Explanation:

Step 1:

Data obtained from the question. This include the following:

Specific heat capacity (C) = 0.24J/g°C

Mass (M) = 15g

Heat (Q) = 262J

Change in temperature (ΔT) =..?

Step 2:

Determination of the change in temperature.

The change in temperature, ΔT can be obtained as follow:

Q = MCΔT

262 = 15 x 0.24 x ΔT

Divide both side by 15 x 0.24

ΔT = 262 / (15 x 0.24)

ΔT = 72.8°C

Therefore, the change in temperature, ΔT is 72.8°C

Answer:

Alkaline

Explanation:

The solution of ash of magnesium ribbon is alkaline.

Answer:

True.

Explanation:

To describe the problem of trying to locate a subatomic particle that behaves  like a wave, Werner Heisenberg formulated what is now known as the Heisenberg  uncertainty principle: it is impossible to know simultaneously both the momentum p  (defined as mass times velocity) and the position of a particle with certainty.

Making measurement of the momentum of a particle more precise means that the position must become correspondingly less  precise. Similarly, if the position of the particle is known  more precisely, its momentum measurement must become less precise.

Answer:

THE SPECIFIC HEAT OF THE METAL IS 0.14 J/g K

Explanation:

First, write out the variables in the question

Mass of sample = 18 g

Initial temp of metal = 96°C = 96 + 273 = 369 K

Mass of water = 21 g

Initill temp of water = 24°C = 24 + 273 K = 297 K

final temp of water and metal  = 26°C = 26 + 273 K = 299 K

temperature change = (

In calorimetry, there is conservation of energy and heat liberated by one is absorbed by the other. That is heat gained is equals to heat lost.

Heat lost by the metal = Heat gained by water

mc ΔT = mc ΔT

18 * C * ( 299 - 369 ) = 21 * 4.2 * ( 299 - 297)

18 * C * -70 = 21 * 4.2 * 2

-1260 C = 176.4

C = 176.4 / 1260

C = 0.14 J/ g K

The specific heat of the metal is hence 0.14 J/g K

Answer:

d

Explanation:

Answer:

The second one is correct

Explanation:

Because reactants are sth that attend in a reaction and can make sth like (MgO) of course in this question. For example in this reaction : H+ClHCl. That H and Cl are reactants

Good luck

Answer:

pH + pOH = 14,  [H₃0⁺] [0H⁻] = 10⁻¹⁴

Explanation:

When it comes to questions involving pH, the equations used are;

[H₃0⁺] [0H⁻] = 10⁻¹⁴

This equation shows the concentration of hydroxonium ions alongside that of the hydroxide ions.

pH + pOH = 14

If the value of either the pH of the pOH is know,one can calculate the value of the other using this equation.

Answer:

The answer is A. The pOH of the solution is 12.0

Explanation:

The formula for pOH is:

pOH = 14 - pH

We know that the pH value is 2.0 so we plug it in the equation:

pOH = 14 - (2.0)

After simplifying it, we get an answer of 12.0 which is the pOH value.

Hope this helps!

Answer:

See below

Explanation:

The common formula of the same alkene series is CnH2n, where n is the quantity of atoms of carbon. Owing to the hydrocarbons of alkenes with at least one double carbon relation, the alkene-like sequence starts with ethen C2H4.

Hope this helps.

The general formula for the homologous series which includes ethene is alkenes.

Alkenes

They are homologous series with the general formula CxH2x.

Where:

x = number of carbon atoms.

Examples are methene with one carbon atom: CH2

Ethene with 2 carbon atoms: C2H4

Propene with 3 carbon atoms: C3H6

More on alkenes can be found here: https://brainly.com/question/7337516

Answer:

c

Explanation:

I would think adapting to changes would be the light moth being in a light trunk of a trees.

Answer:

a

Explanation:

dark colored moths become common after tree trunks become dark took the test.

Answer:

1300cm3.

Explanation:

Step 1:

Data obtained from the question.

Initial temperature (T1) = K

Initial volume (V1) = 650 cm3

Final temperature (T2) = double the original = 2K

Final volume (V2) =..?

Step 2:

Determination of the new volume of the gas.

The new volume of the gas can be obtained by using Charles' law as follow:

V1/T1 = V2/T2

650/K = V2/2K

Cross multiply

K x V2 = 650 x 2K

Divide both side by K

V2 = 650 x 2K /K

V2 = 650 x 2

V2 = 1300cm3.

Therefore, the new volume of the gas is 1300cm3

The new volume of the gas is 1300cm³.

Given:

Initial temperature (T₁) = K

Initial volume (V₁) = 650 cm3

Final temperature (T₂) = double the original = 2K

To find:

Final volume (V₂) =?

Determination of new volume:

V₁/T₁ = V₂/T₂

650/K = V₂/2K

K x V₂ = 650 x 2K

V₂ = 650 x 2K /K

V₂ = 650 x 2

V₂ = 1300cm³

Therefore, the new volume of the gas is 1300cm³.

Find more information about Volume here:

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Answer:

Choice D. Approximately [tex]61.2[/tex] minutes.

Explanation:

The reaction rate of a second-order reaction is proportional to the square of one of its reactants.

Let [tex]k[/tex] denote the rate constant of this reaction. Assume that [tex]y_0[/tex] is the concentration of that reactant at the beginning of this reaction (when [tex]t = 0[/tex].) Because this reaction is of second order, it can be shown that:

[tex]\displaystyle y = \frac{1}{k\, t + (1/y_0)}[/tex].

The question states that the rate constant here is [tex]0.06\; \rm M\cdot min^{-1}[/tex]. Hence, [tex]k = 0.06[/tex]. For simplicity, assume that [tex]t = 0[/tex] when the concentration is [tex]0.13\; \rm M[/tex]. Therefore, [tex]y_0 = 0.13[/tex]. The equation for concentration [tex]y[/tex] at time [tex]t[/tex] would become:

[tex]\displaystyle y = \frac{1}{\underbrace{0.06}_{k}\, t + (1/\underbrace{0.13}_{y_0})}[/tex].

The goal is to find the time at which the concentration is [tex]0.088[/tex]. That's the same as solving this equation for [tex]t[/tex], given that [tex]y = 0.088[/tex]:

[tex]\displaystyle \frac{1}{0.06\; t + (1/0.13)} = 0.088[/tex].

[tex]t \approx 61.2[/tex].

In other words, it would take approximately [tex]61.2[/tex] minutes before the concentration of this second-order reactant becomes [tex]0.088\; \rm M[/tex].

the value of increase in business inventories.

The kind of material used to bake food will influence how much energy is required to heat it up and how quickly it cools. Due to the fact that metal conducts heat more effectively than glass, heating up metal pans often takes longer than heating up glass ovenware.

This implies that the metal absorbs heat from the oven more rapidly and effectively, needing more energy to attain the appropriate temperature. However, oven-safe glass will cool down more quickly than metal.

This is due to the fact that glass is a poor heat conductor, which means it takes more time for the heat to be absorbed by the glass. The glass will shatter after the dish is cooked and the heat is turned off.As the heat takes longer to dissipate, the metal cools down more quickly than the other materials.

In conclusion, glass cools more quickly than metal and requires less energy to heat up than oven-safe metal. This is because metal absorbs heat from the oven more rapidly and effectively than glass since metal is a stronger heat conductor than glass.

However, because glass is a poor conductor of heat, it takes longer for the food to cook and the heat to be absorbed. The glass cools down more quickly than the metal when the heat is gone.

Learn more about conductor   at:

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Answer:

the third option:

increasing the masses of the objects and decreasing the distance between the objects

Answer:

Temporary road closure or coffee break

Explanation:

Assume a car started on a trip at 08:00 and the graph below shows the total distance it travelled every half-hour.

We see that after 1 h (at 09:00) the car was a certain distance from the start.

A half-hour later (at 09:30) the car was still at the same distance.

The car was stopped.

There may have been a bad traffic accident that closed the road or the driver may have stopped for a quick cup of coffee.

Explanation:

The states may differ depending on the reactions

Answer:

6.66 mol

Explanation:

(atm x L) ÷  (0.0821 x K)

(0.875 x 250) ÷  (0.0821 x 400)

=6.66108