Answer:
d:slate
Explanation:
Cutting, melting, bending, or crushing are examples of what kind of change?
Answer:
those are all physical changes and most physical changes can be undone like crushing a pice of metal you can flatten it back out you anwser is physical change
Explanation:
Answer:
It is a physical change because it can be reversed back and no new subtances is dormed.
AH for the reaction
IF5 (g) → IF3 (g) + F2 (g)
kJ, give the data below.
IF (8) + F2 (g) → IF3 (8)
IF (g) + 2F2(8) ► F5 (8)
AH=-390 kJ
AH=-745 kJ
A) -1135
B) +35
C) +1135
D) -35
E) +355
Answer:
E) +355 kJ
Explanation:
Based on Hess's law, it is possible to obtain ΔH of a reaction from the sum of similar reactions:
(1) IF(g) + F2(g) → IF3(g) ΔH = -390kJ
(2) IF(g) + 2F2(g) → IF5(g) ΔH = -745kJ
The sum of (1) - (2) is:
IF(g) + F2(g) → IF3(g)
IF5(g) → IF(g) + 2F2(g)
_________________
IF5(g) → IF3(g) + F2(g)
ΔH = -390kJ - (-745kJ)
ΔH = +355kJ
Right answer is:
E) +355 kJhow many moles are there in 2.75L of a 2.0M solution
8. List the 4 questions to answer when you find the charge on an ion
Answer:
Hope it helps u
Explanation:
FOLLOW MY ACCOUNT PLS PLS
Questions about the kind of charge, the magnitude of charge etc can be asked when the charge on an ion is determined.
What is an ion?An ion is a charged atom or a charged molecule. It attains a charged state because the number of electrons does not remain equal to the number of protons in the atom or the molecule.
The gain of a positive charge by an atom or a negative charge will depend on the fact that whether the number of electrons in an atom is greater than the number of protons or less than the number of protons.
If the atom loses electrons, the total proton number will be higher, so the atom will become positive. If the atom gains electrons, the total electron number will be higher, so the atom will be negative.
The attraction of an atom to another atom happens because it has an unequal number of electrons and protons, then the atom is called an ION. If the atom has more electrons than protons, it is a negative ion or ANION. If it has more protons than electrons, it is a positive ion.
Read more about ions, here
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how many grams are in 2.34 moles of Li?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Lithium, or 6.941 grams.
Thus, the answer would be 16.24194.
Explanation:
Which of the following is not an example of predation?
The shark eating the shrimp
The lion eating the zebra.
The mouse being eaten by the cat.
The flower being pollinated by the bee, and the bee receiving nectar from the flower.
Answer:
the flower big pollinated by The Bee and the receiving letter from the flower
The pressure of a gas is reduced from 1220 mmHg to 836 mmHg as the volume of its container is increased by moving a piston from 85 mL to 350 mL. What would the final temperature (in Kelvin) be if the original temperature was 363 K?
Answer:
1024.24 K
Explanation:
From the question,
Applying the general gas eqaution
PV/T = P'V'/T'.................... Equation 1
Where P, V, and T = Initial pressure, initial volume and initial Temperature of the gas respectively, P', V' and T' = Final pressure, Final Volume and Final temperature of the gas respectively
make T' the subject of the equation
T' = P'V'T/(PV).................... Equation 2
Given: P = 1220 mmHg, V = 85 mL, P' = 836 mmHg, V' = 350 mL, T = 363 K
Substitute these value into equation 2
T' = (836×350×363)/(1220×85)
T' = 1024.24 K
Name the following alkane molecule:
Answer:
c
Explanation:
31. Use the equation given below to answer the following question: If 755 kJ of heat was absorbed, what mass of carbon dioxide reacted?
2CO2 + 43.9 kJ → 2CO +O2
Answer:
1514g of CO₂ reacted
Explanation:
Based on the reaction:
2CO₂ + 43.9kJ → 2CO + O₂
2 moles of carbon dioxide require 43.9kJ of energy to produce 2 moles of carbon monoxide and 1 mole of oxygen
To solve this question, we must convert the 755kJ of energy to moles of carbon dioxide that reacts and to find the mass as follows:
755kJ * (2 moles CO₂ / 43.9kJ) =34.4 moles of CO₂ are produced
Mass CO₂: Molar mass: 44.01g/mol
34.4 moles CO₂ * (44.01g / mol) =
1514g of CO₂ reacted2. What is some ways composting can help make our food system more sustainable ?
Answer:
Organic waste in landfills generates, methane, a potent greenhouse gas. By composting wasted food and other organics, methane emissions are significantly reduced. Compost reduces and in some cases eliminates the need for chemical fertilizers. Compost promotes higher yields of agricultural crops.
Explanation:
Dinitrogen oxide (N2O) gas was generated from the thermal decomposition of ammonium nitrate and collected over water. The wet gas occupied 123 mL at 21◦C when the atmospheric pressure was 760 Torr. What volume would the same amount of dry dinitrogen oxide have occupied if collected at 760 Torr and 21 ◦C? The vapor pressure of water is 18.65 Torr at 21◦C. Answer in units of mL.
Answer:
119.98 mL
Explanation:
Initial volume V1 = 123 ml
Initial temperature = T1 = 21◦C + 273 = 294 K
Initial pressure P1 = 760 Torr - 18.65 Torr = 741.35 Torr
Final volume V2= ???
Final temperature = T2= 21◦C + 273 = 294 K
Final pressure P2 = 760 Torr
From;
P1V1/T1= P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2= 741.35 * 123 * 294/760 * 294
V2 = 119.98 mL
Need help to find the molarity. Please help!
Answer:
0.092M
Explanation:
Molarity of glucose solution = number of moles ÷ volume
According to this question, 12.5g of glucose (C6H12O6) is dissolved in enough water to make 750mL of solution.
Molar mass of glucose (C6H12O6) = 12(6) + 1(12) + 16(6)
= 72 + 12 + 96
= 180g/mol
mole = mass/molar mass
mole = 12.5/180
mole = 0.069mol
Volume of solution = 750mL = 750/1000 = 0.750L
Hence, molarity = n/V
Molarity = 0.069 ÷ 0.750
Molarity = 0.092M
Which of these are vertebrate chordates? (Select all that apply.)
Ο) fish
Ο) humans
Ο) flatworm
Ο) mockingbird
Answer:
humans
Explanation:
vertebate chordates include animals , mammals also the fish option is correct
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO? 4NH3+6NO → 5N2 + 6H2O
Explanation:
M
r
N
H
3
=
17
;
M
r
O
2
=
32
;
M
r
N
O
=
26
;
M
r
H
2
O
=
18
Using the equation:
Number of Moles = Mass / Mr
Number of Moles
N
H
3
=
175
17
=
10.3
Number of Moles
O
2
=
310
32
=
9.69
O
2
is the limiting reagent because the least moles of this are used in the reaction.
From the balanced equation, we can see that
O
2
and
N
O
are in a 5:4 ratio
5
4
=
0.8
9.69
×
0.8
=
7.75
7.75 moles of
N
O
is the maximum that can be produced from 310g of
O
2
. To convert this to mass we use the same equation as in the first step.
Mass = Moles x Mr
7.75
×
26
=
202
g
202g is the theoretical yield of
N
O
To calculate the percentage yield, you just divide the actual yield by the theoretical yield and multiply by 100:
197
202
×
100
=
98
%
The limiting reactant for the reaction between 10 moles of NH₃ and 30 moles of NO is NH₃.
The balanced equation for the reaction is given below:
4NH₃ + 6NO → 5N₂ + 6H₂O
From the balanced equation above,
4 moles of NH₃ reacted with 6 moles of NO.
With the above information, we can obtain the limiting reactant as follow:
From the balanced equation above,
4 moles of NH₃ reacted with 6 moles of NO.
Therefore,
10 moles of NH₃ will react with = [tex]\frac{10 * 6}{4}\\\\[/tex] = 15 moles of NO.
From the calculation made above, we can see clearly that only 15 moles of NO out of 30 moles reacted completely with 10 moles of NH₃.
Therefore, NH₃ is the limiting reactant and NO is the excess reactant.
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What is the percentage composition of C6H12O6? Must show work.
Answer:
I think the percent composition of carbon in C6H12O6 is: 25% C 40% C 7% C
Explanation:
Elements in a groups have the same number of ___ and the same ____.
Answer:
Protons, electrons
Explanation:
Elements in a groups have the same number of protons and the same electrons.
Create 3 multiple choice questions on
photosynthesis and the tropisms.
Number your questions using 1,2,3
and
your answer choices using a,b,c.
Example:
1)What three things are required in order for
photosynthesis to take place
A)Sugar, glucose plants
B)Radiant energy, water, oxygen
C)Radiant energy, water, carbon dioxide
Help ASAP!
What is the average time it took for the tablet to
dissolve in cold water?
Answer:
It might take 20-30 seconds to dissolve in water
Explanation:
Answer:
86
Explanation:
25 g of 116oC steam are bubbled into 0.2384 kg of water at 8oC. Find the final temperature of the system.
Answer: The final temperature of the system will be [tex]13.14^0C[/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]
[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex] .................(1)
where,
q = heat absorbed or released
[tex]m_1[/tex] = mass of steam = 25 g
[tex]m_2[/tex] = mass of water = 0.2384 kg = 238.4 g (1kg=1000g)
[tex]T_{final}[/tex] = final temperature = ?
[tex]T_1[/tex] = temperature of steam = [tex]116^oC[/tex]
[tex]T_2[/tex] = temperature of water = [tex]8^oC[/tex]
[tex]c_1[/tex] = specific heat of steam = [tex]1.996J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water= [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]25g\times 1.996J/g^0C\times (T_{final}-116)=-[238.4g\times 4.184J/g^0C\times (T_{final}-8)][/tex]
[tex]T_{final}=13.14^0C[/tex]
Therefore, the final temperature of the system will be [tex]13.14^0C[/tex]
which of the following is an indicator of a chemical reaction?
A. two different compounds mixing and remaining seperate.
B. changing states of matter (solid to liquid).
C. decreasing in size.
D. increasing in tempurature
Answer:
option . D
Increase in temperature
is an indicator of a chemical reaction
hope it helps
Answer:
answer is D
Explanation:
some signs of a chemical change are a change in colour and the formation of bubbles.
the five conditions of chemical change: colour change, formation of precipitate, formation of a gas ,odor change, temperature change.
I think it will use for you
A 10 kg package is delivered to your house.
Use one complete sentence to describe an example of how work is done on the package as it gets brought inside.
Make sure to use proper spelling, grammar, and other language mechanics.
In your explanation, make sure to use the terms related to the formula for work (W = Fd).
Answer:
Explanation:
Work is a net force applied through a distance in order to displace an object, commonly abbreviated as W. A net force is the sum of all forces acting on an object. Work is mass times acceleration and distance so to find out the work you simply calculate the acceleration of the box being brought in. Next find the distance it was carried to get in the house. Then find out the mass of the box and finally multiply those sums together to get the amount of work put in to bring the package inside.
Which three types of reactions yield a product that is a chemically bonded combination of reactants?
A. replacement, polymerization, decomposition
B. polymerization, decomposition, oxidation
C. decomposition, synthesis, replacement
D. oxidation, synthesis, polymerization
Answer:
D
Explanation:
i just got it right on edge
Answer:
It is D.
Explanation:
I also got it correct on edge :)
which of the following elements have the same number of valence electrons?
l. nitrogen (N)
ll. oxygen (O)
lll. fluorine (F)
lv. sulfur (S)
v. selenium (Se)
A. IV, and V
B. I, II, and III
C. I, II, and IV
D. II, IV, and V
The answer is II. Oxygen, IV. Sulfur, and V. Selenium.
Explanation:
Going down the list that was provided, we can use the periodic table of elements to determine the valence electrons.
- Nitrogen has 5 valence electrons
- Oxygen has 6 valence electrons
- Fluorine has 7 valence electrons
- Sulfur has 6 valence electrons
- Selenium has 6 valence electrons
Since oxygen, sulfur, and selenium all have 6 valence electrons, then that is the correct answer.
I hope this helps you!
Calculate the temperature of a gas when it is expanded to 5.25L. The gas originally occupies 3.90L of space at 252K.
Answer:
[tex]T_2=339K[/tex]
Explanation:
Hello there!
In this case, according to the Charles' gas law as way to understand the volume-temperature as a directly proportional relationship for this problem, we can write:
[tex]\frac{T_2}{V_2}=\frac{T_1}{V_1}[/tex]
Thus, given the initial temperature and volume and the final volume, we are able to calculate the final temperature as follows:
[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{252K*5.25L}{3.90L}\\\\T_2=339K[/tex]
Best regards!
NEED THIS LESSS THAN 5 MINUTES HELP!!! ITS 15 POINTSSWhich of the following is FALSE regarding meiosis?
Meiosis results in four genetically unique cells
Meiosis results in gametes with half the number of chromosomes as the parent cell Meiosis is a type of cell division that produces gametes
All of these answers are true regarding meiosis
Meiosis is what happens when body cells divide to form identical body cells
Answer:
This is false: Meiosis is what happens when body cells divide to form identical body cells.
Explanation:
Meiosis is what happens when body cells divide to form identical body cells
can someone please try to help me
Answer:
I would say B all of these
what does binding energy measure
Answer:
"Electron binding energy, more commonly known as ionization energy, is a measure of the energy required to free an electron from its atomic orbital or from a solid. ... The atomic binding energy of the atom is the energy required to disassemble an atom into free electrons and a nucleus."
Explanation:
Hope this helps! <33
God bless your heart <3333
have a wonderful day!
Binding energy is a required amount of energy that disperses the other particles of the reaction system. It measures the energy needed to free an electron or a subatomic particle.
What is binding energy?Binding energy is the ionization energy that depicts how much energy will be needed if an electron has to be removed from an atom for a reaction to occur.
It can be said that the energy required to free an electron from the orbit of the atom is measured in electron volt (eV). It is a little different from ionization energy as binding energy can remove any subatomic particle and not just an electron.
Therefore, the binding energy measures the freed subatomic particle.
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How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 100.0 mL of 0.25 M H2SO4?
Answer:
5 milliliters
Explanation:
Use the formula M1V1 = M2V2 where M is molarity and V is volume
Plug in numbers
(.25 M)(100 mL) = (5 M)V2
V2 = 5 mL
The volume of stock solution of 5M H₂SO₄ needed to prepare 100mL of 0.25M H₂SO₄ is 5mL.
How do we calculate the volume?Volume of stock solution to prepare any dilute solution will be calculated by using the following formula:
M₁V₁ = M₂V₂, where
M₁ & V₁ is the molarity and volume of stock solution, and
M₂ & V₂ is the molarity and volume of final prepared solution.
On putting values from the question to the above formula and calculate for the value of V₁ as:
V₁ = (0.25)(100) / (5)
V₁ = 5 mL
Hence required volume is 5mL.
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A sample of Xe gas is observed to effuse through a pourous barrier in 4.83 minutes. Under the same conditions, the same number of moles of an unknown gas requires 2.29 minutes to effuse through the same barrier. The molar mass of the unknown gas is _____ g/mol.
Answer:
28.93 g/mol
Explanation:
This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]
We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.
Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.
[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]
The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.
[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]
[tex]{\frac{M2}{131} } = (0.47)^2[/tex]
[tex]{\frac{M2}{131} } = 0.22[/tex]
M2= 0.22 x 131
M2= 28.93 g/mol
47.9 ml hrdrogen is collected at 26° Celsius and 718 torr. Find the volume occupied at STP
Answer:
41.45 mL
Explanation:
Applying the general gas equation,
PV/T = P'V'/T'............... Equation 1
Where P = Initial pressure of hydrogen, V = Initial volume of hydrogen, T= Initial Temperature of hydrogen, P' = Final pressure of hydrogen, V' = Final Volume of Hydrogen, T' = Final Temperature.
make V' the subject of the equation
V' = PVT'/TP'................ Equation 2
Given: P = 718 torr = (718×133.322) N/m² = 95725.196 N/m², V = 47.9 mL = 0.0479 dm³, T = 26 °C = (26+273) = 299 K, T' = 273 K, P' = 101000 N/m²
Substitute these values into equation 2
V' = ( 95725.196×0.0479×273)/(299×101000)
V' = 0.04145 dm³
V' = 41.45 mL