Queston
Which equation shows how to calculate how many grams (g) of KOH would
be needed to fully react with 4 mol Mg(OH)2? The balanced reaction is:
MgCl2 + 2KOH → Mg(OH)2 + 2KCI
OA. mol Mg(OH),
2 mol KOH
mol Mg(0H),
56.10 g KOH
1 mol KOH
2 mol KOH
1 mol Mg Cl,
56.10 g KOH
1mol KOH
OB. mol Mgch
1
1mol Mg(OH),
2 mol KOH
1mol Ma(0H),
56.10 g KOH
1 molkOH
mol Mg (OH,
1 mol KOH
2 mol Ma(OH)
56 10 g KOH
1mol KOH
OD.
Answers
Answer:
C
Explanation:
We know that the molar mass of KOH is 56 gmol-1
Molar mass of Mg(OH)2 is 58.31 g/mol
Now; the balanced reaction equation is; MgCl2 + 2KOH → Mg(OH)2 + 2KCI
Hence;
2 moles of KOH yields 1 mole of Mg(OH)2
4 moles of KOH yields;
4 moles of KOH/1 mol * 1 mole Mg(OH)2 /2 moles KOH * 58.31 g Mg(OH)2 / 1 mole Mg(OH)2
So option c is correct
Answer:
4mol MG(OH)2/1 * 2mol KOH/1 mol MG(OH2) * 56.10g KOH/1 mol KOH
Explanation:
Took the test
Related Questions
the earth's crust is part of which sphere?
Answers
Answer:
Lithosphere
Explanation:
The lithosphere is the solid, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth's structure. It is bounded by the atmosphere above and the asthenosphere (another part of the upper mantle) below.
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HELP ASAP PLS Is an oxygen ion and fluorine ion bigger and why?
Answers
Answer:
From top to bottom of the periodic table ions will increase in radii. However, now left to right the radius is more of a function of the number of electrons. ... Similarly, O2- will be larger than F- as both have 10 electrons but Z=8 for oxygen and Z=9 for fluorine.
The oxygen ion is bigger than the fluorine ion , the reason is explained below
What is an Atomic Structure ?
An atom is composed of electrons , protons and neutrons .
Electrons have negative charge and are grouped in different shells around the nucleus
Protons and neutrons are present in positively charged nucleus
The nucleus has the most mass .The atomic number is the number of protons which is equal to the number of electrons.
Both oxygen atom and fluorine atoms are isoelectronic , they have 10 electrons in the shell , but oxygen has 8 protons while fluorine have 9 protons in the nucleus.
It is believed that as the atomic number increases so the attraction forces of the nuclei increases , making the nucleus smaller and the overall atom smaller
while the oxygen atom on reduction forms oxide anion , which is a dianion and a fluorine atom forms fluoride ion which has a single negative charge and the ion which has more electrons have more electron electron repulsion and the size of the ion is bigger.
Hence the oxygen ion is bigger than the fluorine ion.
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Which chemical equations show a precipitation reaction?
Select all the correct answers.
2NaNO3(aq) + NiCl2(aq) → 2NaCl(aq) + Ni(NO3)2(aq)
MgSO4(aq) + CaCl2(aq) → MgCl2(aq) + CaSO4(s)
AlBr3(aq) + 3LiI(aq) → AlI3(aq) + 3LiBr(aq)
FeCl2(aq) + Na2CO3(aq) → FeCO3(s) + 2NaCl(aq)
2AgNO3(aq) + Na2S(aq) → Ag2S(s) + 2NaNO3(aq)
Answers
The equations that show a precipitation reaction would be [tex]MgSO_4(aq) + CaCl_2(aq) --- > MgCl_2(aq) + CaSO_4(s)[/tex], [tex]FeCl_2(aq) + Na_2CO_3(aq) --- > FeCO_3(s) + 2NaCl(aq)[/tex], and [tex]2AgNO_3(aq) + Na_2S(aq) --- > Ag_2S(s) + 2NaNO_3(aq)[/tex]
What is a precipitation reaction?It is a reaction in which two soluble salts react in aqueous solutions to form one soluble and one insoluble salt.
Thus, all the equations with an insoluble salt as one of the products will qualify as precipitation reactions. The insoluble is designated as (s).
Hence, the following are precipitation reactions:
[tex]MgSO_4(aq) + CaCl_2(aq) --- > MgCl_2(aq) + CaSO_4(s)[/tex][tex]2AgNO_3(aq) + Na_2S(aq) --- > Ag_2S(s) + 2NaNO_3(aq)[/tex][tex]FeCl_2(aq) + Na_2CO_3(aq) --- > FeCO_3(s) + 2NaCl(aq)[/tex]More on precipitation reactions can be found here: https://brainly.com/question/24158764
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A light bulb consumes energy at a rate of 80
joules per second . How long in
seconds will it take for the light bulb to consume 2.30 ~ 105
in energy?
Answers
Answer:
2875 s
Explanation:
From the question given above, the following data were obtained:
Power (P) = 80 J/s
Energy (E) = 2.3×10⁵ J
Time (t) = ?
Power can simply be defined as the rate at which energy is used. Mathematically, power is expressed as:
Power = Energy / time
P = E/t
With the above formula, we can obtain the time taken for the bulb to consume 2.3×10⁵ J. This can be obtained as follow:
Power (P) = 80 J/s
Energy (E) = 2.3×10⁵ J
Time (t) = ?
Power = Energy / time
P = E/t
80 = 2.3×10⁵ /t
Cross multiply
80 × t = 2.3×10⁵
Divide both side by 80
t = 2.3×10⁵ / 80
t = 2875 s
Therefore, it will take 2875 s for the bulb to consume 2.3×10⁵ J of energy.
i need help
can anyone help me
Answers
Number of atoms in 4.5 moles of Au?
Answers
How would kinetic energy of the dominoes be affected if the first domino did not hit the second one?(((20 points)))
Answers
Answer:
Not affected.
Explanation:
Kinetic energy of the dominoes not affected if the first domino did not hit the second one because no kinetic energy is lost due to no collision. If the first domino hit the second one, its kinetic energy decreases and changes in other form of energy such as heat and sound energy etc. But when there is no collision occur, then there is no change in the kinetic energy of dominoes.
What is the name for C2I3
Answers
Answer: The correct name for the compound [tex]C_2I_3[/tex] is, Dicarbon triiodide.
Explanation:
[tex]C_2I_3[/tex] is a covalent compound because in this compound the sharing of electrons takes place between carbon and iodine.. Both the elements are non-metals. Hence, it will form covalent bond.
The naming of covalent compound is given by:
The less electronegative element is written first.
The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.
If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.
Hence, the correct name for the compound [tex]C_2I_3[/tex] is, Dicarbon triiodide..
bill nye chemical reactions:
the picture looks cut off but can someone please help!
Answers
Answer:
. A(n) _______________________________ is matter that is composed of 2 or more different kinds of atoms.
2. A chemical reaction in which energy is released/given off is _____________________________________.
3. A(n) _________________________________ is a process in which substances are changed into other
substances.
4. Matter that is composed of only 1 kind of atom is a(n) ______________________________.
5. ___________________ is the ability to do work and/or transfer heat.
6. A chemical reaction in which energy is absorbed/taken in is _______________________________.
Knew/New
Write down 3 things you already knew about chemical reactions that were confirmed through watching the
video:
1.
2.
3.
Write down 3 new things that you learned from watching the video:
1.
2.
3.
Episode Guide
1. Chemicals can react to form new _________________________________.
2. Chemical reactions happen when ____________________ hook together.
3. Energy is given off during a chemical reaction because ____________________ are combining with other
__________________________.
4. During the "Try this" experiment, we see the students using vinegar and salt to clean old copper pennies.
The copper gets stripped away and the pennies look new again. Explain why you think this happens.
__________________________________________________________________________________________
Answer Key
compound
exothermic
chemical reaction
element
Energy
endothermic
Answers will vary.
Answers will vary.
chemicals
electrons
electrons
electrons
Copper atoms in the penny react with oxygen atoms from the air & together they form copper oxide which
makes the pennies look dull and dirty. The copper oxide dissolves in a weak acid (the vinegar & salt).
5. When vinegar and baking soda react together, the new substance that is produced is ___________________.
6. _______________ & ______________ are both dangerous by themselves, but when they react together they
form table salt.
7. Pyrotechnician is a name given to people who work to create _________________________.
8. In another experiment, we see kids blow up a balloon by mixing together vinegar and baking soda. When
the kids touch the blown up balloon, it is ____________ to the touch. This means that the reaction is
endothermic or exothermic
9. When someone gets hurt playing sports, often times a cold pack is used for the injury. The cold pack takes
up more energy than it gives off and it gets very ___________ to the touch. This means that the reaction taking
place is endothermic or exothermic
10. How do you know baking a cake is a chemical reaction? ________________________________________
11. There are ___________ naturally occurring elements.
12. If elements are in the same group on the periodic table, what does that tell you? ______________________
__________________________________________________________________________________________
True or False
1. When something burns, heat & light are given off. T or F
2. Your stomach growling is an example of a chemical reaction. T or F
3. Water is 1 part hydrogen and 2 parts oxygen. T or F
4. When baking a cake, a chemical reaction takes place. T or F
5. Everything is made of chemicals. T or F
6. Alfred Nobel invented dynamite. T or F
7. You should always wear safety goggles when working with chemicals. T or F
8. Sodium chloride is better known as sugar. T or F
9. A substance can feel a little warm if the reaction is endothermic. T or F
10. When developing film, red light doesn't affect the picture. T or F
11. A cold pack gets cold because the reaction takes more energy than it gives off. T or F
12. If chemicals behave similarly, they are grouped together on the periodic table. T or F
13. Chemical reactions happen when protons link atoms together. T or F
14. When vinegar and baking soda react, oxygen is produced. T or F
15. Fireworks are not an example of chemical reactions. T or F
carbon dioxide
Sodium chlorine
fireworks
warm
cold
The ingredients (flour, milk, eggs, etc.) are changed
Explanation:
1. Your knee cap (patella) is just a hard cartilage. True or False?
2.When a muscle is working it can only contract, or get shorter. True or False?
3. When a muscle is NOT working, the opposing muscle is contracting and THIS is what moves the bone True or False?
4. What is the soft tissue between bones called?
5. What do Tendons do
6. What do you have that an octopus doesn’t have... physically?
Answers
2. From the nervous system yes
3. True
4. Tendon
5. Make a soft cushion in your bones
6. Hair
A root is an example of a/an-
A: tissue
B: cell type
C:organ
D:organism
Answers
Answer: D an organism
Explanation:
the answer is C.
have a good day mate
Which feature does an iron metal have?
Answers
How many atoms are in 1 mole of water, H2O?
Answers
Answer:
1.807×10and at the top of ten put -24
please helpppppppppp
Answers
Answer:
Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles
And the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.
What is the standard reduction potential, E, for the half-reaction Al(aq) +
3e→ Al(s)?
OA. -0.76 V
OB. -1.68 V
Oc. 2.37 V
OD. 2.71 V
SUBMIT
Answers
The standard reduction potential for the given question is-1.68 V, under the condition that the given half-reaction is Al(aq) +3e→ Al(s), then the required answer to the given question is Option B.
The standard reduction potential refers to the potential difference comparing the standard hydrogen electrode (SHE) and the half-reaction. The (SHE) possess a standard reduction potential of 0 V at all temperatures.
Hence, the standard reduction potential for the half-reaction Al(aq) + 3e→ Al(s) can be evaluated as follows
E°(Al₃⁺(aq) + 3e⁻ → Al(s)) - E°(H⁺(aq) + e⁻ → 1/2H₂(g))
= -1.66 V - 0 V
= -1.66 V
≈ -1.68 V
A half-reaction can occur for either the oxidation or reduction reaction component of a redox reaction. It projects the change in oxidation states of the substances involved. Half-reactions are applied to describe the processes in an electrochemical cell, in which one metal is oxidized at the anode and another metal is reduced at the cathode.
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Answer:
B
Explanation:
-1.68 V
What is the temperature if 2L of 3moles HCl react with 2atm?
Answers
Answer:
[tex]T=16K=-256.8\°C[/tex]
Explanation:
Hello!
In this case, according to the gas laws, we would be able to assume HCl can be modeled as an ideal gas for this calculation purpose; in such a way, we use the following equation to compute the temperature:
[tex]PV=nRT\\\\T=\frac{PV}{nR}[/tex]
In such a way, we plug in moles, volume and pressure to obtain:
[tex]T=\frac{2atm*2L}{3mol*0.08206\frac{atm*L}{mol*K}}\\\\T=16K=-256.8\°C[/tex]
Best regards!
When all the colors of the spectrum are combined, what will the human
eye see?
A black
B. blue
C. red
D. white
Answers
Answer: white?
Explanation:
When all the colors of the spectrum are combined and strike the human eye at the same time, the human eye will see white color. Therefore, option (D) is correct.
What is the electromagnetic spectrum?The electromagnetic spectrum can be described as the range of frequencies of electromagnetic radiation and its wavelengths and photon energies. The electromagnetic spectrum have range from below one hertz to above 10²⁵ hertz.
Electromagnetic radiation with a wavelength between 380 to 760 nm is detected by the human eye and recognized as visible light. Other wavelengths, especially near-infrared and ultraviolet are also sometimes referred to as light.
White light can be defined as a combination of lights of different wavelengths in the visible region of the spectrum. When white light is passed through a prism splits it up into the several colors of light observed in the visible spectrum.
Therefore, all the colors of the spectrum are combined, and the human eye will see white color.
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HELP??????..... Which type of semiconductor is created by doping with atoms that contain more valence electrons than the semiconductor material?
A. Intrinsic and p-type
B. Intrinsic
C. N-type
D. P-type
Answers
Answer:
Explanation:
N - type semi conductor
How can you tell S-wave arrival from the end of the P-wave?
Answers
Answer:
The P wave will be the first wiggle that is bigger than the rest of the little ones (the microseisms). Because P waves are the fastest seismic waves, they will usually be the first ones that your seismograph records. The next set of seismic waves on your seismogram will be the S wavesWhat element corresponds to period 5, group 2
Answers
Answer:
Strontium is the second element placed in the 5th period
Hope this will help you if not so advance sorry :)
what does (I) means in a chemical equation
Answers
Answer:
the l sign means the substance in the chemical equation is a liquid. (hope this helped : D )
the ______ biodiversity in ecosystem is, the more sustainable it will be.
Answers
i think that the more diverse an ecosystem is the more sustainable it will be. do you have a picture of your problem?
2
What is the difference between weight and mass?
A Weight depends on density and mass depends on gravity.
B Weight depends on gravity and mass depends on volume.
C
Mass depends on gravity and weight is constant.
D Welght depends on gravity and mass is constant.
Answers
Answer:
Weight is the measure of the force of gravity on an object. The mass of an object will never change, but the weight of an item can change based on its location. For example, you may weigh 100 pounds on Earth, but in outer space you would be weightless.
Explanation:
I can't see the options but I hope this helps!
Answer:
the answer is B.
I hope this helps!
Explanation:
What is this element?
Answers
Explanation:
sodium element with 11 electrons,11protons and 12 neutrons
please help..............
Answers
rgrgtff
ghhbbbhhghghgghgggferer
a pure sample of an unknown molecule has a mass of 0.03551 kg and contains 0.2000 moles wbat is the molecular weight of the substance
Answers
Answer:
No
Why?
Explanation:
A pure sample of an unknown molecule has a mass of 0.03551 kg and contains 0.2000 moles.
What is the molecular weight of the substance?
Answer:
177.6 g/mol
Explanation:
Trust me
write the neutralization equations that take place in the stomach with the bases present in the antacid product
Answers
Answer:
See explanation.
Explanation:
Hello!
In this case, since the antacid is usually composed by the following bases:
- Calcium, magnesium and aluminum hydroxides.
- Hydrogen sodium carbonate.
- Sodium carbonate.
In such a way, the feasible reactions that undergo when they react with the stomach acid are shown on the attached picture. As you can see, they all have in common the formation of chlorides and water, which are the neutralization products that calm down the acidity as they are neutral.
Best regards!
Plsss name this compound
Answers
Explanation:
It looks like 2,2,4-trimethylpentane.
Longest alkane chain contains 5 carbons. => -pentane
3 methyl groups on the 2nd, 2nd and 4th carbons.
A piece of glass has a temperature of 83˚C. Liquid that has a temperature of 43˚C is poured over the glass, completely covering it, and the temperature at equilibrium is 53˚C. The mass of liquid and glass is the same. If the specific heat of glass is 840 J/(kg˚C), determine the specific heat of the liquid.
Answers
Answer: The specific heat of the liquid is [tex]2520J/kg^0C[/tex]
Explanation:
[tex]heat_{absorbed}=heat_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
.................(1)
where,
q = heat absorbed or released
= mass of glass = x kg
= mass of liquid = x kg
= final temperature =
[tex]T_1[/tex] = temperature of glass = [tex]83^oC[/tex]
[tex]T_2[/tex] = temperature of liquid = [tex]43^oC[/tex]
[tex]c_1[/tex] = specific heat of glass = [tex]840J/kg^0C[/tex]
[tex]c_2[/tex] = specific heat of liquid= ?
Now put all the given values in equation (1), we get
[tex]-[(x\times 840\times (53-83)]=x\times c_2\times (53-43)[/tex]
[tex]c_2=2520J/kg^0C[/tex]
Therefore, the specific heat of the liquid is [tex]2520J/kg^0C[/tex]
What are the complete Ionic and Net Ionic equations for the following
a) CaCl2(aq) + Pb(NO3)2(aq) → PbCl2(s) + Ca(NO3)2(aq)
b) CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl2(aq)
c) 2AgNO3 (aq) + BaI2(aq) → Ba(NO3)2 (aq) + 2AgI (s)
Answers
Answer:
Check photo
Explanation: