The heat associated with the reaction (qrxn, in KJ) when 4.85 grams of H₂ is produced is +693.55 KJ
Balanced equation2H₂O → 2H₂ + O₂ ΔH°rxn = +572 KJ
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 2 × 2 = 4 g
SUMMARY
From the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
How to determine the heat requiredFrom the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
Therefore,
When 4.85 g of H₂ is produced = (4.85 × 572) / 4 = +693.55 KJ of heat will be required.
Thus, +693.55 KJ of heat is required for the reaction.
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Answer:
c. saturated
d. unsaturated
e. The solute isn't in the table G, so it is impossible to know
f. saturated
g. saturated
h. supersaturated
4. About 73 g
5. About 55 °C
6. About 58 °C
Where is the independent variable usually located in a scientific table?
Third through fifth columns
First and second columns
First column
Second column
Answer:
First column
Explanation:
In most cases, the independent variable (that which you purposefully change) is in the left column, the dependent variable (that which you measure) with the different trials is in the next columns, and the derived or calculated column (often average) is on the far right.
Why water can be unsafe in a pool?
Answer:People can drown or call or slip in
Explanation:
2.
Which form of cell division produces four cells with chromosomes different from the
parent cell?
B
budding
dominant
meiosis
Dmitosis
Answer:
meiosis
Explanation:
Balance an equation
Answer:
no
Explanation:
s ss s s s s s s s s s s s s ss s s s s dkfkf f f f f f f f
help me I beg you please
Answer:
44 98
Explanation:
Carbon Dioxide (CO2) - Has 1 carbon and 2 oxygens,
C=12 O=16,
Relative atomic mass(Ar) = 12 + (16 x 2),
Relative formula mass(Mr)= 44
Sulphuric Acid (H2SO4) - Has 2 hydrogens, 1 sulphur and 4 oxygens,
H=1 S=32 O=16,
Relative atomic mass(Ar) = (1 x 2) + 32 + (16 x 4)
Relative formula mass(Mr)= 98
Which of the following natural processes will NOT directly result in the formation of sedimentary rock?
A. River Flow
B. Windstorm
C. Metamorphic change
D. Glacial Motion
Answer:
Windstorm Hope it helped brainiest plz and thank you have a great day!!!
Explanation:
Which of the following natural processes will NOT directly result in the formation of sedimentary rock?
B. Windstorm
Can a stable compound be made from these two atoms? Explain why or why not.
The given oxygen and lithium atoms are unable to form a stable compound.
The given atoms to form a stable compound has been oxygen and lithium.
A stable compound has been formed when the transfer of atom has been resulted in the completion of the valence shell of both the electrons.
The oxygen has 6 valence electrons and require to gain 2 electrons to form the stable compound. The Lithium has 3 electrons and has been able to lose 1 electron to form a stable compound.
Since, the formation of stable compound between oxygen and lithium requires transfer of 2 electrons, and there has been availability of 1 electron from Li. Thus, the atoms are unable to form a stable compound.
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Question 9
Element Q is a theoretical nonmetal with atomic number 57. Consider the isotope: Q-110. How
many electrons are in an atom of Q-110 if the atom has a charge of -2?
Answer:
This isotope has 59 electrons giving it a charge of -2.
Explanation:
To find this we have to understand isotope relates to the mass of the nucleus. This isotope has 59 electrons to counter the protons and give it a negative charge.
In an atom, the atomic number is equal to number of electrons , hence element Q has 57 electrons on addition 2 electrons that is -2 charge the number of electrons is 59 electrons.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Combustion of 28.0 g of gasoline releases 322 kcal of thermal energy. How many kilojoules of energy are released?
In the combustion of 28.0 g of gasoline, 1348.1 kilojoules of energy are released.
To find the energy released, we need to convert the energy in kilocalories to kilojoules.
We need to remember that:
1 cal = 4.1868 J (joules)1 kcal = 1000 cal1 kJ = 1000 JHence, the energy in kJ is:
[tex] E = 322 \:kcal*\frac{4.1868 \:J}{1 \:cal}*\frac{1000 \:cal}{1 \:kcal}*\frac{1 \:kJ}{1000 \:J} = 1348.1 \:kJ [/tex]
Therefore, 1348.1 kilojoules of energy are released.
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I hope it helps you!
If you have a density of 3 g/mL and a volume of 10 mL, what is the mass?
Answer:
30 gram
Explanation:
Hope this helps
Brainliest pls ❤️
We mix 88 grams of oxygen gas with 33 grams
of argon gas in a volume of 2400 mL at 62◦C.
What will be the final pressure of the gas
mixture?
The final pressure of the gas mixtures is 72.48 atm.
The given parameters;
mass of the oxygen = 88 gramsmass of the argon, = 33 gramsvolume of the gaseous mixture, V = 2400 mL = 2.4 LThe number of moles of the gases is calculated as follows;
[tex]number \ of \ moles \ of \ oxygen = \frac{88}{16} = 5.5 \ moles\\[/tex]
[tex]number \ of \ moles \ of \ argon = \frac{33}{40} = 0.825 \ moles\\[/tex]
The total number of moles of the gas mixture;
= 5.5 + 0.825
= 6.325 moles
The final pressure of the mixture is calculated as follows;
PV = nRT
[tex]P = \frac{nRT}{V} \\\\P = \frac{6.325\ mol \times (0.0821 \ L.atm/mo.K) \times (62+273)}{2.4 \ L} \\\\P = 72.48 \ atm[/tex]
Thus, the final pressure of the gas mixtures is 72.48 atm.
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Chemical contamination is more likely to
occur under which of the following
situations?
When cleaning products are not stored properly
When dishes are sanitized with a chlorine
solution
When raw poultry is stored above a ready-to-eat
food
When vegetables are prepared on a cutting
board that has not been sanitized
Chemical contamination is likely to occur when cleaning products are not stored properly.
Chemical contamination refers to the introduction of harmful chemicals into food, water or the environment. These chemical substances may come in contact with food and water in many ways.
The most common sources of chemical contamination are chemical substances that are not properly stored.
Hence, chemical contamination is likely to occur when cleaning products are not stored properly.
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What is the function of the load in
an electric circuit?
A rectangular block weighs 121g. The dimensions of the block are 9.1cm by 5.4cm by 2.3cm. From this data, what us the density of the block in g/mL? Will tge block float or sink in water and how do you know? Show all your work on a piece of paper.
The density of the rectangular block is 1.07 g/mL.
From the question, we have the mass of the rectangular block as 121g
The dimensions of the block are given as follows;9.1cm by 5.4cm by 2.3cm
So we have the volume of the block as; 9.1cm × 5.4cm × 2.3cm = 113 cm^3
Let us recall that; 1 cm^3 = 1 mL, so 113 cm^3 = 113 mL
Having said that, we must also remember that;
Density = Mass/volume
Density = 121g/113 mL
Density = 1.07 g/mL
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A substance that flows is called a
Answer: a fluid???
Explanation: Sorry if it is wrong but i think that is right
A 10.35 kg block of ice has a temperature of −22.3 °C. The block absorbs 4.696 x 10^6 J of heat. What is the final temperature of the liquid water?
Answer:
: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question: A 10.35 kg block of ice has a temperature of - 22.3 degree C. The block absorbs 4.696 times 10^6 J of heat. What is the final temperature of the liquid water?
Previous question
Explanation:
what would the heat transfer be if you are making macaroni and it rises and falls in a pot on the stove ?
In the equation above an element is identified by which latter
Answer:
C
Explanation:
Option C points to Sr which is the element Strontium
Describe the relationship between the state of matter of water (gas, liquid, solid) and the motion of the water molecules
Water has three states of matter namely gas, solid or ice form and liquid. Molecules in solid state are not able to move since they are tightly packed.
Molecules can move in liquid state and they moves easily in gaseous state.
What is states of matter?Every substance have three states, that are gas, liquid and solid. In solid state, molecules are tightly packed and are unable to move apart. In liquid state, molecules have some space to move and motion of liquid is easy.
The movement of molecules in a substance depends on the space allotted for them or called the volume. More volume between molecules, easy to move apart.
Gaseous state is composed of molecules located far apart from each other and they diffuse easily. Therefore, motion in three states of water is different and moves faster in gaseous state.
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need boy who is at leaast 12
Answer:
helloo!!!!!!! I am 12 :)
How many grams are there in 7.4x10^23 atoms of AL
Answer:
24 grams of FeF3
Explanation:
✞What Is an Alloy?⭐⭐
Which statement is true concerning visible light and the electromagnetic spectrum?
A.
Visible light is a large portion of the electromagnetic spectrum.
B.
Visible light is a small portion of the electromagnetic spectrum.
C.
All electromagnetic radiation is considered to be visible.
Answer:
The true statement concerning visible light and electromagnetic radiation is considered to be - d. Visible light is a small portion of the electromagnetic spectrum.
The electromagnetic spectrum is the range of frequencies of electromagnetic waves or radiations. This spectrum also gives an idea about the wavelengths of electromagnetic radiations. The part of the spectrum on their higher to lower energy or frequency range from Hz to Hz are:
gamma rays
X-rays
ultraviolet radiation
visible light
infrared radiation
radio waves.
The visible light is the very small part of the electromagnetic spectrum that ranges from the to, Visible light is the light that the human eye can see.
Thus, the correct answer is- option d.
Learn more about visible light:
Explanation:
i did this
Which factor causes Earth’s seasons?
Answer:
The sun's position near earth
Explanation:
The mass of 2.50 moles of calcium fluoride (CaF2) is how many
grams.
Answer:
195.199 grams
Which letter in the diagram represents the transition from liquid to gas?
A
B
C
D
B, D in the diagram represents the transition from liquid to gas. A phase diagram is a sort of figure that is used in physical chemistry.
What is phase diagram?A phase diagram is a sort of figure that is used in physical the field of chemistry engineering, mineralogy, as well as materials science to demonstrate the conditions (pressure, temperatures, volume, etc.) that exist when thermodynamically different phases (such solid, liquid, or gaseous states) arise and coexist at equilibrium.
Lines of equilibrium, also known as phase boundaries, or circumstances under which different phases may exist at equilibrium, are typical elements of a phase diagram. Phase changes take place along equilibration lines. Despite their frequent occurrence, metastable phases are not equilibrium phases, hence they are not depicted on phase diagrams. B, D in the diagram represents the transition from liquid to gas.
Therefore, B, D in the diagram represents the transition from liquid to gas.
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https://phet.colorado.edu/sims/html/collision-lab/latest/collision-lab_all.html
Answer:
its not pulling up ? ;(
Explanation:
why do ionic compound are good insulator ?
need a proper answer please
Answer:
Ionic compounds conduct electricity when molten or in aqueous solution, because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
Explanation:
Pls mark me as the brainlest!!,
A 300 milliliter container that is filled with 100 milliliters of oxygen and 200 mL of hydrogen has a total pressure of 750 milliliters of mercury. What is the partial pressure of the oxygen
