Yes, the chemical reaction occurs because new substance is formed and heat energy is released.
What is chemical reaction?Chemical reaction is a process in which one or more substances i.e. the reactants, are converted to one or more different substances i.e. the products so we can conclude that the chemical reaction occurs because new substance is formed and heat energy is released.
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The density of copper is 8.68 g/mL use the density value to determine how many moles are
contained in a 125 mL sample.
Answer:
17.1 mol
Explanation:
(8.68g/mL * 125 mL) = 1085 g
1085 g/ (63.55 g/mol) = 17.1 mol
What is the density of an object with a mass of 60 g and a volume of 2 cm3?
Answer:
The answer is 30 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 60 g
volume = 2 cm³
We have
[tex]density = \frac{60}{2} \\ [/tex]
We have the final answer as
30 g/cm³Hope this helps you
Solid ionic compounds have very high melting points because they
Answer:
Are held together by strong electrostatic forces of attraction between oppositely charged ions. These compounds have high melting points and high boiling points because of the large amounts of energy needed to break the many strong bonds.
Explanation:
:)
a competition between a given substance and its dissolved species is ?
Answer:
Explanation:
It is odd to describe the presence of a given substance and its dissolved species as a competition but the state is called an equilibrium in solubility.
Answer:
Solubility
Explanation:
Mark that
The amount of given substance and dissolved species is constant at equilibrium .
As per le ch atler's principle
If you change the concentration it would affect the Equilibrium n
Guys i need help with these questions! I will give brainliest to the first person who answers
How do you write 72,000,000 in scientific notation
Answer:
7.2 × 10^7 is the correct answers.
Thank you ☺️☺️
PLEASE HELP!?!.!,! What are the products of the combustion of a hydrocarbon?
carbon and oxygen
carbon dioxide and water
carbon and hydrogen
carbon dioxide and hydrogen
Answer:
carbon dioxide and water
Explanation:
Example: Combustion of Methane (CH₄(g))
CH₄(g) + 2O₂(g) => CO₂(g) + 2H₂O(g)**
____________________
Note: The combustion of any hydrocarbon produces CO₂ & H₂O. That is,
Ethane (C₂H₆) + O₂ => CO₂(g) + H₂O(g)
Propane (C₃H₈) + O₂ => CO₂(g) + H₂O(g)
Butane (C₄H₁₀) + O₂ => CO₂(g) + H₂O(g)
The issue remaining is to balance the reaction equation. For these type equation balance Carbon 1st, then Hydrogen and finish with Oxygen. Balancing in this order leaves Oxygen which can be balanced using fractions. If problem requires lowest whole number ratios of elements, simply multiply entire equation by 2 to get standard equation*
______________________
*Standard Equation is defined as the smallest whole number ratios of elements. The 'standard equation' is significant in that it is assumed to be at STP conditions; i.e., 0⁰C (=273K) & 1.0 Atmosphere pressure.
Ethane (C₂H₆) + 7/2O₂(g) => 2CO₂(g) + 3H₂O(g)=> 2C₂H₆ + 7O₂(g) => 4CO₂(g) + 6H₂O(g) <= Standard Form of Rxn
Propane (C₃H₈) + 5O₂(g) => 3CO₂(g) + 4H₂O(g) <= Standard Form of Rxn (no need to balance with the '2' multiple)Butane (C₄H₁₀) + 13/2O₂ => 4CO₂(g) + 5H₂O(g)=> 2C₃H₈ + 13O₂(g) => 4CO₂(g) + 5H₂O(g) <= Standard Form of Rxn
______________________
**Also, note that water, H₂O(g), is listed as a gas. In some cases it will be listed as a liquid, H₂O(l).
A substance burning in the presence of oxygen produces heat and light, a process known as combustion. Combustible compounds are defined as those substances that burn. Carbon dioxide and water are the products. The correct option is B.
The process of combustion is a chemical interaction between the fuel (hydrocarbon) and the oxygen. Heat and light energy are released when fuel and oxygen react. The flame then develops from the energy of heat and light. Hydrocarbon + Oxygen = Heat energy is the equation for a combustion reaction.
Complete combustion occurs when there is a sufficient amount of air available. The hydrocarbon fuel's carbon and hydrogen atoms undergo an exothermic reaction with oxygen to form carbon dioxide and water. Energy is released.
Thus the correct option is B.
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How many grams does 1.0 liter of motor the density of motor oil is 0.80g / mL
A large beaker has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water. What is the molarity of the solution?
A: 9.9 M
B: 10 M
C: .78 M
D: 8M
The molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
M = n/V
M = molarity of solutionn = number of moles V = volume of solutionMolarity = 5.25/6.75
Molarity = 0.78M
Therefore, the molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.
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cement company uses 9.30 × 105 kg of limestone daily. The limestone decomposes upon heating, forming lime and carbon dioxide:
CaCO3(s) CaO(s) + CO2(g)
What volume of CO2 at 683 torr and 25.0°C is released into the atmosphere daily by this company?
The volume of CO₂ at 683 torr and 25.0°C released into the atmosphere daily by this company is 2.53×10⁸ L
How to determine mole of CaCO₃ that decomposed Mass of CaCO₃ = 9.30×10⁵ kg = 9.30×10⁵ × 1000 = 9.3×10⁸ gMolar mass of CaCO₃ = 100 g/mol Mole of CaCO₃ =?Mole = mass / molar mass
Mole of CaCO₃ = 9.3×10⁸ / 100
Mole of CaCO₃ = 9.3×10⁶ moles
How to determine the moles of CO₂ producedBalanced equation
CaCO₃ —> CaO + CO₂
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of CO₂
Therefore,
9.3×10⁶ moles of CaCO₃ will also react to produce 9.3×10⁶ moles of CO₂
How to determine the volume of CO₂Pressure (P) = 683 torr = 683 / 760 = 0.899 atmTemperature (T) = 25.0 °C = 25 + 273 = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 9.3×10⁶ molesVolume (V) =?V = nRT / P
V = (9.3×10⁶ × 0.0821 × 298) / 0.899
V = 2.53×10⁸ L
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state three reasons why air is
•Chassifield as a mixture
One is through sublimation
Answer:
Air is considered as a mixture because it is composed of various separate components. The air has no characteristic properties of its own. ur welcome :)
Explanation:
What are mitochondria? Why
are
they called
the engines of cells?
Answer:
they are call the engine of the cell because they are the one that provides energy for the cells
Which electromagnetic wave has lowest frequency and shortest wavelength
net ionic equation for Sb(OH)3 + Na2S?
Answer:
2 Sb3+ (aq) + 3 S2- (aq) ⇒ Sb2S3 (s)
Explanation:
Molecular equation for Sb(OH)3 + Na2S
2 Sb(OH)3 (aq) + 3 Na2S (aq) ⇒ Sb2S3 (s) + 6 NaOH (aq)
Ionic equation for Sb(OH)3 + Na2S
2 Sb3+ + 6 OH- + 6 Na+ + 3 S2- ⇒ Sb2S3 + 6 Na+ + 6 OH-
To get the net ionic, any duplications on the left or right side would be canceled.
∴ Thus, the net ionic equation for Sb(OH)3 + Na2S is 2 Sb3+ (aq) + 3 S2- (aq) ⇒ Sb2S3 (s)
The net ionic equation is a chemical equation that shows only those ions that are involved directly in the formation of the final product. The net ionic equation for the given reaction is [tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex].
Net ionic equation:It is a chemical equation that shows only those ions that are involved directly in the formation of the final product.
So, molecular equation,
[tex]\bold {2 Sb(OH)_3 (aq) + 3 Na_2S (aq) \rightarrow Sb_2S_3 (s) + 6 NaOH (aq)}[/tex]
Now, write the ionic equation,
[tex]\bold {2 Sb_3^+ + 6 OH^- + 6 Na+ + 3 S_2^- \rightarrow Sb_2S_3 + 6 Na^+ + 6 OH^-}[/tex]
To make a Net ionic equation cancel all the duplicate ions present on both sides of the equation.
[tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex]
Therefore, the net ionic equation for the given reaction is [tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex].
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Determine the number of moles of CO2 that contain 7.93 x 1023 O atoms.
Answer:
This question requires use of Avogrado’s constant that states there are 6.02 x10^23 constituent particles contained in the amount of a substance given by one mole. Constituent particles are usually molecules, ions or atoms. Therefore there are 18.06x10^23 total atoms, 12.04x10^23 oxygen atoms, 6.02x10^23 carbon atoms and 6.02x10^23 carbon dioxide molecules.
A red shirt obsorbs red light true or false
Answer:
A red shirt appears red to our eyes because the shirt absorbs the red wavelengths of visible light. The shorter the wavelength of light, the more energy it has.
Explanation:
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Which two forms of heat transfer work together to heat water in a plastic bottle?
a. reflection and convection
b. conduction and convection
c. radiation and reflection
d. convection and reflection
Which equation describes the process of photosynthesis?
carbon dioxide + glucose + sunlight → water + oxygen
oxygen + water + sunlight → glucose + carbon dioxide
oxygen + glucose + sunlight → water + carbon dioxide
carbon dioxide + water + sunlight → glucose + oxygen
Answer:
The FIRST option, give me brainliest answer pls
Explanation:
The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen
Answer:
(a)
carbon dioxide+ glucose+ sunlight * water + oxygen
Explanation:
I Took This Test Before, I Hope You Get A Good Grade On The Rest Of The Questions
Which has a higher lattice energy? Na3n or Na2O. And why?
Because the extent of ionic charge is more important than ionic radius in calculating the lattice energy of ionic compounds. Because the ionic charge of the N3-ion is greater than that of the F-ion, the Na3N molecule has a higher lattice energy than the NaF complex.
The lattice energy increases when the ion charge variable is increased. As a result, ions with higher charge values generate ionic compounds with higher lattice energies. As a result, ions with lower charges lower the lattice energies of their compounds.
What cells do you think is in metaphase? why?
Fill in the coefficients that will balance the following reaction: Fill in the blanks
_____HCIO4+___Pb(NO3)3 ->___Pb(CIO4)3+___HNO2
Answer:
3HClO⁴ + Pb(NO³)³ => Pb(ClO⁴)³ + 3HNO²
Answer:
4HCIO4+-3Pb(NO3)3-and3Pb(CIO4)3+4HNO2
explain how heat is related to thermal energy
Answer: Heat energy is another name for thermal energy.
Explanation:
As thermal energy comes from moving particles, it is a form of kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature.
Answer:
When a substance heats up, the rise in temperature makes these particles move faster and bump into each other. Thermal energy is the energy that comes from the heated up substance. The hotter the substance, the more its particles move, and the higher its thermal energy.
The box shows the element nitrogen as it appears in the
periodic table,
N
Nitrogen
Which two parts are needed to make a neutral atom of nitrogen?
A Aruscles with seven protons and seven neutrons
B. A nucleus with three protons and four neutrons
C. Electron clouds with a total of 14 electrons
D. Electron clouds with a total of seven electrons
Answer:
Option D. Electron clouds with a total of 7 electrons.
Explanation:
For an atom to be neutral (i.e having a charge of zero), the number of protons and electrons must be equal.
Thus, to know which option is correct, we shall determine the number of protons and electrons in the nitrogen atom as given in the question above.
From the question given above, we obtained the following:
Atomic number = 7
Mass number = 14
Number of protons =?
Number of electrons =.?
Next, we shall determine the number of protons in the nitrogen atom as follow:
Atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically,
Atomic number = proton number
Atomic number = 7
Therefore,
Number of protons = 7
Next, we shall determine the number of electrons in nitrogen atom as follow:
Since the atom is neutral (i.e having a charge of zero), the number of protons and electrons are equal i.e
Number of protons = number of electrons
Number of protons = 7
Therefore,
Number of electrons = 7
Thus, the nitrogen atom must have 7 electrons in order for it to be neutral.
**** Check ****
Charge of atom = Proton – Electron
Charge = 0
Proton = 7
Electron = 7
Charge of atom = Proton – Electron
0 = 7 – 7
0 = 0
Answer:
A and D
Explanation:
Took test.
59 Q.No. 28 b Hydrogen peroxide can act as oxidizing as well as reducing agent with example.
Answer:
Hydrogen peroxide can function as an oxidizing agent as well as reducing agent.
H2O2 act as oxidizing agent in acidic medium.
Explanation:
Example : 2FeSO4 +H2SO4 +H2O2 —>
(ferrous sulphate)
Fe2(SO4)3 +2H2O
(ferric sulphate)
Normally the capital ÎGo° for a reaction would be determined at standard temperature with each reactant at a concentration of 1 M. Letâs assume that the 1 M 2-PG solution will reach the same equilibrium ratio that would be observed under standard conditions. The enzyme enolase catalyzes the conversion of 2-PG to phosphoenolpyruvate (PEP) in living systems. You find that when you add enolase to your 2-PG solution it reaches an equilibrium with 0.68M PEP and 0.32 M 2-PG. What is the capital ÎGo° for this reaction?
Use R= 1.987 cal/mol.K
a. +559 cal/mol
b. - 559 cal/mol
c. +379 cal/mol
d.-379 cal/mol
Answer:
d.-379 cal/mol
Explanation:
ΔG = ΔG⁰ + RT ln K
for equilibrium ΔG = 0
ΔG⁰ + RT ln K =0
ΔG⁰ = - RT ln K
PG ⇒ PEP
K = [ PEP ] / [ PG ]
= .68 / .32
= 2.125
ΔG⁰ = - 1.987 x 273 x ln 2.125
= - 409 Cal / mole
Option d is the nearest answer .
What do you know about social science?
Answer:
once hydrogen ions are outside the membrane they are allowed to flow back in. this flow is changed to energy that is stored in the bonds of new molecules.
Explanation:
what about this?
Which of these best explains the distribution of natural resources?
A. Resources are distributed evenly across Earth's systems.
B. Resources are distributed where they are needed by humans.
C. Resources are distributed unevenly and often must be moved for human use.
D. Resources are located in areas where they can be transported without damage to the environment.
Answer:
c
Explanation:
resources are distributed unevenly and often must be moved for human use
Answer:c
Explanation: correct on edg 2020
A 5.90 g sample of titanium chemically combined with oxygen to form 9.84 g of titanium oxide. What is the empirical formula of titanium oxide
Need Help ASAP!!!! Due in 5 min!!!
Living cells are classed as either prokaryotic or eukaryotic. Which of the following characteristic(s) identify eukaryotic cells? Select all that apply.
are produced by division of another cell
comprise most multi-celled organisms
contain cytoplasm
are the smallest unit of living matter
mostly single-celled organisms
have membrane-bound organelles
contain DNA
have a nucleus
number of SO42- ions in 20.4 g Cr2(SO4)3
✅
IamSugarBee
One mole of or 392 g of chromium sulphate gives 3 moles of sulphate ions. Thus 30 g of chromium gives 0.15 moles of sulphate ions or 9.39 ×10²² ions.
What are ions?Ions are charged substances formed by electron lose or gain by an atom. If an atom gain an electron it acquire one unit of negative charge and if it lose an electron it acquires a positive charge.
The ionization of chromium sulphate is written as follows:
[tex]Cr_{2}(SO_{4})_{3} \rightarrow 2Cr^{3+} + 3SO_{4}^{2-}[/tex]
Hence, one moles of chromium sulphate forms 3 moles of sulphate ions. One mole of chromium sulphate is 392.18 g/mol. Thus number of moles 20.4 g of the compounds is 20.4 / 392.18 = 0.052 moles.
The number of moles of sulphate ions produced by 0.052 moles of chromium sulphate is calculated as follows:
0.052 × 3 = 0.15 moles.
One mole of sulphate ion contains 6.022 × 10 ²³ions. Thus number of ions in 0.15 moles is 0.15 ×6.022 × 10 ²³ = 9.39 ×10²² ions.
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