I need help with #4 please

Answer:

3.48 g

Explanation:

Because its useful.

Answer:

-1464 kJ/mol

Explanation:

The balanced equation for the reaction is given as;

C2H4(g)+3O2(g)→2CO2(g)+2H2O(l) ΔH∘1=?

The enthalpy of the reaction is given by the equation;

Enthalpy of reaction = Enthalpy of products - Enthalpy of reactants

Products:

2CO2(g)+2H2O(l)

Enthalpy of Products = 2 (−394) + 2(−286)

Enthalpy of Products = -1360 kJ/mol

Reactants:

C2H4(g)+3O2(g)

Enthalpy of Reactants = 2 (52) + 3(0)

Enthalpy of Reactants = 104 kJ/mol

Enthalpy of Reaction =  -1360 - 104 = -1464 kJ/mol

Answer:

Ecosystem

Explanation:

The levels of organization from lowest complexity to highest are:

species, population, community, ecosystem

Answer:

answer. the measure. is f=90 the equbaliint is 180

Explanation:

yan ang sagot ko

Answer:

it's A) or E)

others are not suitable cuz their melting point is weak.

Answer:

Gallium

Explanation:

Because the melting point is low and the drinks are usually around 60-70 degrees Celsius so it wil melt

Answer:

Oxygen mucury carbon dioxide and platinum

Explanation:

Answer:The standard Gibbs energy change at 300K for the reaction 2A⇔B+C is 2494.

Explanation:

ΔG = free energy at any moment.

ΔGo = standard-state free energy.

R is the ideal gas constant = 8.314 J/mol-K.

T is the absolute temperature (Kelvin)

lnQ is natural logarithm of the reaction quotient

Answer:

A

Explanation:

edge

Answer:

4.0359398 × 10^-23 g

Explanation:

All explanations or thoughts led to that answer

Answer:

thermal energy: the part of total internal energy that can be transferred (a portion of the kinetic energy)

heat is the thermal energy that flows from one substance to another due to a temperature difference.

Thermal energy is measured in temperature change.

Thermal energy transfer stops when thermal equilibrium is achieved (Both substances at the same temperature).

conduction: Transfer of thermal energy through a solid object like heat transferring up a metal spoon from a hot cup of coffee.

convection: the transfer of thermal energy due to the movement of a liquid or gas caused by differences in temperature. Only in a fluid (liquid or gas). Breezes, ocean currents.

radiation: Transfer energy with or without matter. Warming from the Sun, microwave oven.

Answer:

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission. Hope this helps!

Explanation:

Answer:

molecule is a group of atoms bonded together representing the smallest fundamental unit of a chemical reaction

Answer:

0.112M is molarity of the Na₂S₂O₃ solution

Explanation:

First, the KIO₃ reacts with KI as follows:

KIO3 (aq) + 5 KI (aq) + 6 HCl (aq) → 3 I2 (s) + 6 KCl (aq) + 3 H2O (l)

Then, the I₂ produced reacts with the Na₂S₂O₃ as follows:

2 Na2S2O3 + I2 → Na2S4O6 + 2 NaI

Thus, to solve this question, we need to obtain the moles of KIO₃ that react, then, the moles of I₂ produced -Using the chemical reaction- to find the initial moles of Na₂S₂O₃. With these moles and the volume we can find molarity of the solution:

Moles KIO₃:

21.45mL = 0.02145L * (0.0135mol/L) = 2.896x10⁻⁴ moles KIO₃

Moles I₂:

2.896x10⁻⁴ moles KIO₃ * (3mol I₂ / 1mol KIO₃) = 8.687x10⁻⁴ moles I₂

Moles Na₂S₂O₃:

8.687x10⁻⁴ moles I₂ * (2mol Na₂S₂O₃ / 1mol I₂) = 1.737x10⁻³ moles Na₂S₂O₃

As the volume of the titrated solution is 15.55mL, molarity is:

1.737x10⁻³ moles Na₂S₂O₃ / 0.01555L =

Answer:

22.4 L at standard temperature and pressure.

Answer:

9.2288 L

Explanation:

The equation of the reaction is given as;

2 Ca(NO3)2 → 2 CaO + 4 NO2 + O2

From the reaction;

2 mol of Ca(NO3)2 produces 4 mol of NO2

Converting 33.8g to Number of moles;

Number of moles = Mass / Molar mass

Number of moles = 33.8 g / 164.088 g/mol

Number of moles = 0.206 mol

2 = 4

0.206 = x

Solving for x;

x = 0.206 * 4 / 2

x = 0.412 mol

At STP;

1 mol = 22.4 L

0.412 mol = x

Solving for x;

x = 0.412 * 22.4 = 9.2288 L

answer is below!! hope this helped

A 6.0-V battery does 1200 J of work transferring charge, then 100C charge is transferred.

One or more electrochemical cells with external connections for powering electrical equipment make up an electric battery, which is a source of electric power.

A battery's positive terminal serves as the cathode and its negative terminal serves as the anode when it is delivering electricity.

Electricity is accepted, stored, and released on demand by batteries and similar devices. Like many other common energy sources, batteries store energy through chemistry in the form of chemical potential.

For instance, until they are burned, logs store energy in their chemical bonds for later conversion to heat.

V = 12 V

W = 1200 J

q = ?

V = W / q

12 = 1200 / q

q = 100 C

Thus, A 6.0-V battery does 1200 J of work transferring charge, then 100C charge is transferred.

To learn more about battery follow the link;

https://brainly.com/question/19225854

#SPJ2

Answer:

There is a ozone layer because of the special atomphere and chemical conditions that takes place there. I think the consequences of that home area is the very low winter temperatures.

Answer:

There is a hole in the ozone layer because of the pollution on earth. Because of that the UV rays are easily entering the earth through that portion. The consequences of this can be cancers, global warming and disastrous storms.

plz mark as brainliest

Answer:

Ridges.

Explanation:

Watersheds are separated from one another by ridges. Ridges are elevated boundaries that divide watersheds.

Answer:

Increased

Explanation:

We know that the higher the temperature the higher the rate of reaction. This implies that as the temperature is increased, a reaction tends to proceed faster.

This follows from the collision theory, the higher the temperature, the higher the energy of the reacting particles hence they collide with each other faster and more effectively.

Thus the rate of reaction( or reaction time) for the carton of milk on the counter was increased.

Answer: The concentration of hydrogen ions is [tex]10^{-11}M[/tex] and the concentration of hydroxide ions is [tex]10^{-3}M[/tex]. Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.  

[tex]pH=-\log [H^+][/tex]

[tex]pOH=-\log[OH^-][/tex]

Putting in the values:

[tex]11=-\log[H^+][/tex]

[tex][H^+]=10^{-11}M[/tex]

[tex]pH+pOH=14[/tex]

[tex]pOH=14-11=3[/tex]

[tex]3=-log[OH^-][/tex]

[tex][OH^-]=10^{-3}M[/tex]

Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.

Answer:

the highest frequency

Explanation:

Answer:

it can affect your growth, like it can stunt your growth and could get health problems. pls make me brainiest.

Answer:

C. 3

Explanation:

volume = length×width×height

3×3×3=27

Answer:

Explanation:

Chemistry is often referred to as the central science because it joins together physics and mathematics, biology and medicine, and the earth and environmental sciences. Knowledge of the nature of chemicals and chemical processes therefore provides insights into a variety of physical and biological phenomena.

Answer:

Science chemistry is the investigation of issue, examining its design, properties and conduct to see what happens when they change in substance responses. Thusly, it very well may be viewed as a part of actual science, close by stargazing, physical science and studies of the planet including geography.

Explanation:

.Science chemistry is fundamental for meeting our essential requirements of food, clothing, cover, wellbeing, energy, and clean air, water, and soil. Substance advances improve our personal satisfaction in various ways by giving new answers for issues in wellbeing, materials, and energy use.

Here are the absolute best motivations to concentrate on science.

,Science assists you with figuring out your general surroundings. ...

,,Essential information on science assists you with perusing and

comprehend item marks.

,,,Science can assist you with pursuing informed choices. ...

,,Science is at the core of cooking. ...

,,,An order of science can assist with guarding you

Answer:

chlorate changes to chlorous acid