Answer:
3) 9.1 x 10^3 J
Explanation:
7th grade science help me plsssss
Answer:
They grow slowly over time, they are made up of multiple organisms.
Explanation:
One polyp is one individual. A Coral is made up of several polyps. Each polyp is less than 1 centimeters but a coral is made of many polyp so the coral itself cant be 1 centimeters across.
URGENT!!!
A solution has a [H3O+] of 1 × 10−5 M. What is the [OH−] of the solution? (5 points)
9 M
14 M
1 × 10−9 M
1 × 10−14 M
Answer:
[tex]{ \bf{from \: ionic \: product \: of \: water : }} \\ { \boxed{ \tt{k _{w} = [H _{3} O {}^{ + } ][OH {}^{ - } ]}}} \\ \\ { \tt{1 \times {10}^{ - 14} = (1 \times {10}^{ - 5} ) [OH {}^{ - } ]}} \\ \\ { \tt{[OH {}^{ - } ] = 1 \times {10}^{ - 9} }} \: M[/tex]
A solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
What is [OH−] of the solution?The water is made up of H2O only and when the pH of it is 7 then the concentration of all the ions would be the same while dissociation the water will get dissociate into H+ ions and OH- ions.
The concentration of OH- ions will be
OH- = Kw {H3O+}
{H3O+} = 1 × 10−5 M.
Kw = 14
substituting the value in the equation,
OH = 14 { 1 × 10−5 M.}
OH = 1 × 10−9 M
Therefore, the solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
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Timed PLS help
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answer:
19.5g is the theoretical yield of alum
Explanation:
Based on the balanced reaction, 4 moles of sulfuric acid produce 2 moles of alum. To solve this question we need to find the moles of H2SO4. With these moles we can find the moles of alum and its mass assuming all sulfuric acid reacts producing alum.
Moles Sulfuric Acid:
8.3mL = 0.0083L * (9.9mol/L) = 0.08217 moles sulfuric acid
Moles Alum:
0.08217 moles sulfuric acid * (2mol KAl(SO4)2•12H2O / 4mol H2SO4) =
0.041085 moles KAl(SO4)2•12H2O
Mass Alum -Molar mass: 474.3884 g/mol-
0.041085 moles KAl(SO4)2•12H2O * (474.3884 g/mol) =
19.5g is the theoretical yield of alumtype of intermolecular forces in paraffin
Answer:
The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.
Explanation:
Answer: The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.
Explanation:
The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent. 103 Paraffin wax is soluble in: a) water; b) hexane; c) acetone; d) ethanol Is shopping bag (polyethylene)
hope it helps
Which of the following happens when a reaction reaches dynamic equilibrium in a closed system? (5 points) A. Reaction stops. B. Reaction happens in both directions. C. The concentrations of the reactants and products increase. D. The concentrations of the reactants and products decrease.
Answer:
B Reaction happens in both directions.
Answer:
B. Reaction happens in both directions!
Explanation:
Dynamic equilibrium is reached once a reaction becomes reversible -- meaning that, when a reaction is in dynamic equilibrium, the forward reaction rate and the backward reaction rate, are equal or occurring at the same time!
Equilibrium is really just like saying they're [the reactions] at a point where they're both "balanced" and so they're equal, nothing is changing and they're going equally both ways! (This is just for explanatory reasons, but "balanced" isn't the correct term to use for dynamic equilibrium, as it is used for other things in Chemistry!)
Hope this helps a little! [And that I didn't confuse you!] :)
Given the equilibrium reaction at constant pressure:
2HBr(g) + 17.4 kcal — H2(g) + Br2(g)
When the temperature is increased, the equilibrium will shift to the
A Right, and the concentration of HBr(g) will increase
B Left, and the concentration of HBr(g) will decrease
C Right, and the concentration of HBr(g) will decrease
D) Left, and the concentration of HBr(g) will increase
Answer: C Right, and the concentration of HBr(g) will decrease
Since it is an endothermic reaction the equilibrium will shift to the right direction i.e. product side decreasing concentration f HBr.
In the case when the temperature is increased so here the equilibrium should be shifted to the right and the concentration of HBr(g) will decrease.
Impact on increase in temperature:The given reaction represent the endothermic reaction since it absorb the heat.
So in the case when there is endothermic reaction so here there should be increase in temperature since the reaction should goes forward direction and the concentration of HBr(g) will decrease.
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The number of protons plus the number of neutrons in an atom is equal to its
atomic number
mass number
nuclear model
energy level
Explanation:
mass number....................
Which particles are transferred during a redox reaction
Answer:
Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change— .
Electrons will be transferred during redox reaction.
What is electron?The electron is subatomic particles which are placed in surrounding the nucleus. Electrons carry negative charge.
What is redox reaction?Redox reaction involve the transfer of electrons between intermediates. A redox reaction occurs when the oxidation states of the substrate change. The removal of electrons or even a rise in the oxidation state of such a chemical or its atoms is referred to as oxidation. The acquisition of electrons or a lowering in the oxidation number of a chemical or the atoms inside it is referred to as reduction.
Hence the answer will be electron
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Convert each of the following masses to the units requested
A. 500 liter to deciliters
B. 4200 km to hm
PLEASE HELP, WILL MARK BRAINLIEST How many moles is 2.80 x 1024 atoms of silicon (Si)? Show your work.
Answer:
4.65 moles
Explanation:
1 mole ---> 6.022×10²³ atoms of si
X mole ---> 2.8×10²⁴ atoms of si
X= 2.8×10×10²³/6.022×10²³
=28/6.022
=4.65moles
The table below shows two types of electromagnetic waves and three random applications of electromagnetic waves.
Type of Wave Applications of Waves
Gamma rays 1. Used in spectrometers to measure elements on the surface of celestial bodies
Radio waves 2. Used to measure gravity fields
3. Detect the heat released by astronomical objects
Which of these best matches the waves with their applications?
Gamma rays—2 and radio waves—3
Gamma rays—3 and radio waves—2
Gamma rays—2 and radio waves—1
Gamma rays—1 and radio waves—2
Answer:
Gamma rays—3 and radio waves—2
Explanation:
hard time seeing question, but i believe it is Gamma rays—3 and radio waves—2
C6H12O6 (aq) -> 2 C2H5OH (aq) + 2 CO2 (g)
a. How many moles of CO2 are produced when 0.400 mol of C6H12O6 reacts in this
fashion?
b. How many grams of C6H12O6 are needed to form 7.50 g of C2H5OH?
c. How many grams of CO2 form when 7.50 g of C2H5OH are produced?
Answer:
a. 0.8 moles of CO₂ are produced when 0.400 mol of C₆H₁₂O₆ reacts.
b. 7.5 grams of C₂H₅OH are produced by 14.67 grams of C₆H₁₂O₆.
c. 7.17 grams of CO₂ form when 7.50 g of C₂H₅OH are produced.
Explanation:
The balanced reaction is:
C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole C₂H₅OH: 2 molesCO₂: 2 molesThe molar mass of each compound is:
C₆H₁₂O₆: 180 g/moleC₂H₅OH: 46 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole* 180 g/mole= 180 gC₂H₅OH: 2 moles* 46 g/mole= 92 gCO₂: 2 moles* 44 g/mole= 88 gThen you can apply the following rules of three:
a. If 1 mole of C₆H₁₂O₆ produces 2 moles of CO₂, 0.4 moles of C₆H₁₂O₆ produces how many moles of CO₂?
[tex]moles of CO_{2} =\frac{0.4 moles of C_{6} H_{12} O_{6} *2moles of CO_{2} }{1 mole of C_{6} H_{12} O_{6} }[/tex]
moles of CO₂= 0.8 moles
0.8 moles of CO₂ are produced when 0.400 mol of C₆H₁₂O₆ reacts.
b. If 92 grams of C₂H₅OH are produced by 180 grams of C₆H₁₂O₆, 7.5 grams of C₂H₅OH are produced by how many mass of C₆H₁₂O₆?
[tex]mass of C_{6} H_{12} O_{6}=\frac{7.5 grams of C_{2} H_{5} OH* 180 grams of C_{6} H_{12} O_{6}}{92grams of C_{2} H_{5} OH}[/tex]
mass of C₆H₁₂O₆= 14.67 grams
7.5 grams of C₂H₅OH are produced by 14.67 grams of C₆H₁₂O₆.
c. If 92 grams of C₂H₅OH are produced along with 88 grams of CO₂, 7.5 grams of C₂H₅OH are produced along with how many mass of CO₂?
[tex]mass of CO_{2}=\frac{7.5 grams of C_{2} H_{5} OH* 88 grams of C O_{2}}{92grams of C_{2} H_{5} OH}[/tex]
mass of CO₂= 7.17 grams
7.17 grams of CO₂ form when 7.50 g of C₂H₅OH are produced.
Why does the water turn blue after some time when blue ink is dropped in water? Which property
of particles of matter is depicted here?
Answer:
Particles are constatantly moving and diffusing
This is possible because of diffusion
Explanation:
Hope this helps
the structure of butanoic acid
answer on here fjchcjfjdnc.com
A change in 1 degree Celsius is = a change in 1 Kelvin
True
False
Answer:
true
Explanation:
because I'm smart yes yes
What dose the wave carry
Answer:
Waves carry energy from one place to another.
Because waves carry energy,some waves are used for communication,eg radio and television waves and mobile telephone signals.
Explanation:
i hope it helps
that's my answer
correct me if im wrong
#carryonlearningIn which type of bond are electrons shared equally between two atoms?
Answer:
Nonpolar Covalent Bond
Explanation:
A nonpolar covalent bond is one in which the bonding electrons are evenly distributed between the two atoms.
Good Luck!
Hope this helps!
:)
do the
math!
Wavelength Frequency
Speed
Medium
200 Hz
1500 m/s
The table shows measurements of
some properties of a sound wave in
water and in air.
Water
400 Hz
3.75 m
Water
343 m/s
Air (20°C)
10 m
Calculate Using what you know
about the relationship between
wavelength, frequency, and speed,
fill in the table.
17.15 Hz
343 m/s
Air (20°C)
1a
CHALLENGE What can this table
tell
you about the speed of a wave?
Answer:
everything can be found in the picture
Is lithium ionization energy high low or medium?
Analyze the given diagram of the carbon cycle below. An image of carbon cycle is shown. The sun, a cloud, two trees, one towards left and the other towards right, an animal, lake, and a factory are included. Arrow A points from the sun to the left tree. Arrow B points from the air above the clouds to the left tree. Arrow C points from the factory towards the air above the clouds. Arrow D points from the air to the lake labeled Carbonates in Water. Arrow E points from the label Dead Organism under the animal to label Fossils and Fossil Fuels. Arrow F points from the right tree to the air. Part 1: Which process does arrow A represent? Part 2: Which type of energy transformation does arrow A represent? Part 3: Justify why this process is a recycling of carbon in the carbon cycle.
Answer:
Arrow a represents photosynthesis. 2 it transforms sunlight, water, and carbon dioxide into gluton, or food for the plants. 3 It recycles carbon because humans breath in oxygen and exhale carbon dioxide, plants then take in the carbon and exhale oxygen.
Explanation:
Susan wants to go back to college. She has a lot of debit and she needs to take out a loan. What you would you recommend that she does? Remember to answer in complete sentences.
Answer:
Firstly, search for proper Job by which she can earn money & from that money she can use it for her study
Explanation:
If I was in that situation, then I would do this.
I am sorry if you wouldn't like mine suggestion
In the diagram shown, what is occurring at the section marked 4 ?
Temperature
:: ا
4
2
Heat Energy
O Melting
Freezing
O Condensation
O Vaporization
Answer:
Vaporization
Since the question does not specify what molecule is being acted upon by the increment in temperature, I'll assume it's water.
When first taken out of the fridge, water is in the form of ice, and it has not been affected by a change in temperature yet, so it's at the origin.
(origin = ice)
As you raise the temperature, however, the ice starts to melt, and melting occur during phase 2. You have to keep the temperature constant for the process to properly occur.
(phase 2 = melting)
After it finishes melting, the ice is now in it's liquid state, which is water. The temperature continues to rise in order to proceed to the next phase.
(2nd slope = water)
Lastly, Water is being vaporized during phase 4. Notice, the temperature is kept constant in order to allow the process to properly occur.
(phase 4 = vaporization)
What volume of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water?
Answer:
200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water.
Explanation:
The solution is the result of the mixture between the solute, which is the substance that dissolves, and the solvent, which is the substance in which a solute dissolves. That is, a solution (or solution) is a mixture of two or more components, perfectly homogeneous since each component is intimately mixed with the other.
The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. A unit of concentration is the percent weight to volume.
The percent weight to volume is the percentage ratio between the weight of the solute and the volume of the solution. It is calculated as:
[tex]Percent =\frac{mass of solute}{volume of solution} *100[/tex]
Mass is measured in grams, while volume is measured in mL.
In this case:
Percent weight to volume= 6%mass of solute= 12 gvolue of solution= ?Replacing:
[tex]6=\frac{12 g}{volume of solution} *100[/tex]
Solving:
volume of solution*6= 12 g*100
[tex]volume of solution=\frac{12 g}{6} *100[/tex]
volume of solution= 200 mL
200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water
A mixture consists of 25.60 grams of iron and
4.25 grams of silver. What is the mole fraction of
silver?
Answer:it will be 425/10
Explanation:cause you are asking fraction so if you divide it by 10 dot would go backwards
The Copper Chloride solution used in the investigation contained 300 grams per dm3 of solid CuCl2 dissolved in 1dm3 of water.
The student used 50cm3 of copper chloride solution in each experiment. Calculate the mass of solid copper chloride used in each experiment.
Answer:
The mass of solid copper chloride used in each experiment=15 g
Explanation:
We are given that
Mass of copper chloride in solution=300g/dm3
Volume of solution used in each experiment=50 cm3
We have to find the mass of solid copper chloride used in each experiment.
[tex]1cm^3=0.001 dm^3[/tex]
[tex]50cm^3=0.05 dm^3[/tex]
1 dm3 contained solid copper chloride=300 g
0.05 dm3 contained solid copper chloride=[tex]300\times 0.05[/tex]g
0.05 dm3 contained solid copper chloride=15 g
Hence, the mass of solid copper chloride used in each experiment=15 g
Which of the following is an advantage of using an energy-efficient household
appliance instead of a traditional household appliance?
A. It works only during the daytime.
B. It uses no electricity
c. It conserves electricity.
D. It does not work as effectively
II. Which statement seems more likely to be true?
A.
Double replacement reactions are always neutralizations.
B.
Neutralizations are always double replacement reactions.
Answer:
B
Explanation:
Neutralisations are always double replacement reactions
Determine the number of protons, electrons, and neutrons present in an atom of patassium. Explain how you determined your answer using complete sentences.
Please make sure your right.
Thank you!!!
At constant temperature and pressure, the coefficients for gaseous species in a valences chemical reaction can be interpreted as? 1) grams 2) pressure 3) volume 4) atoms
A compound contains 46.67% Silicon and 53.33% oxygen. What is the
simplest formula for this compound?
Answer:
SiO2
Explanation:
