Answer:
by touch !!!
Explanation:
it's by touch, have a good day
☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
Conduction is the transfer of heat between substances that are in direct contact with each other.
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Explain why this substance is formed?
How many moles of O are in 11.6 mol Fe(NO3)3?
Express your answer in moles to three significant figures.
Answer:
Why might the expression "1 mole of nitrogen" be confusing? ... WebAssign will check your answer for the correct number of significant ... Calculate the moles of O atoms in 8.18 g of Mg(NO3)2. ... If the molar mass of hemoglobin is 6.8 104 g/mol, how many Fe2+ ions are ... (_) C7H16(l) + 11 O2(g) 7 CO2(g) + 8 H2O(g)
Explanation:
water is a ____ molecule meaning the positive hydrogen end attracts the negative oxygen ends of another
A. balance
B.universal
C. wet
D.polar
please answer! will give brainliest
Water is a polar molecule where, the positive hydrogen end attracts the negative oxygen ends of another water molecule. Thus, option D is correct.
What is polarity ?Polarity is ability of charge separation in a molecule. In some molecules, the positive and negative ends exists separately and both ends remains reactive towards the counter charged end of other molecule.
The charge separation in molecules results in a dipole moment. Permanent dipole moment make the molecule polar. Water is a polar molecule.
The shared pair of electrons in water are more attracted towards the electronegative oxygen atom leads the charge separation. This polarity helps to the formation of strong intermolecular hydrogen bonding.
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Which would have a stronger attraction to the nucleus, the outer electrons of a carbon atom or the outer electrons of an oxygen atom? Why?
The outer electron of an oxygen atom will have a stronger attraction to the nucleus than the outer electrons of a carbon atom.
In the periodic table, atomic sizes decrease across the period. This decrease in atomic size stems from increase in the size of the nuclear charge.
This implies that as we move from left to right in the periodic table, atoms of elements become smaller due to stronger nuclear attraction as the size of the nuclear charge becomes larger.
Oxygen atom has a nuclear charge of +8 while carbon atom has a nuclear charge of +6. Therefore, outer electron of an oxygen atom will have a stronger attraction to the nucleus than the outer electrons of a carbon atom.
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Which statement best describes the use of a chemical indicator in a titration?
A. It must be measured to the nearest 0.01 mL.
B. It must be colored in the acid solution.
C. It must measure pH directly at all pH values.
D. It must change color near the equivalence point.
The statement best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What is a chemical indicator?A chemical indicator is any substance that shows a chemical change by color or other things.
In titration, phenolphthalein is used as an indicator in the titration of an acid or base.
Other chemical indicators are methyl yellow, litmus paper, and pH indicator.
Thus, the correct option is D. It must change color near the equivalence point.
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define saturated and unsaturated fats
Answer:
SATURATED: Saturated fat is a type of fat in which the fatty acid chains have all or predominantly single bonds.
UNSATURATED: Unsaturated fats are loosely packed. They tend to be liquid at room temperature.
There are two main types of unsaturated fat:
Monounsaturated
Polyunsaturated
The radius of a spherical aluminum atom is 140 picometers. How many aluminum atoms could be lined up across a length of 27.9 cm.
Answer:
9.96 × 10⁸
Explanation:
Step 1: Calculate the diameter of 1 aluminum atom
The diameter of a sphere is 2 times the radius.
d = 2 × 140 pm = 280 pm
Step 2: Convert "d" to m
We will use the conversion factor 1 m = 10¹² pm.
280 pm × 1 m/10¹² pm = 2.80 × 10⁻¹⁰ m
Step 3: Convert the total length (L) to m
We will use the conversion factor 1 m = 100 cm.
27.9 cm × 1 m/100 cm = 0.279 m
Step 4: Calculate the number of atoms of aluminum required
We will use the following expression.
L/d = 0.279 m/2.80 × 10⁻¹⁰ m = 9.96 × 10⁸
5.14 x 1023 ions NaCl to Moles
Answer:
2 moles
Explanation:
For a mole NaCi, we have a mole of sodium ion and a mole of chloride.
A compound is found to contain 29.67 % sulfur and 70.31 % fluorine by mass.
To answer the question, enter the elements in the order presented above.
QUESTION 1:
The empirical formula for this compound is
if the temperature of 20.0 L of gas were increased to twice the initial value, while the pressure is held constant what would be the volume of the gas at the new temperature
Answer:
40 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 20 L
Initial temperature (T₁) = T
Final temperature (T₂) = 2T
Pressure (P) = constant
Final volume (V₂) =?
The new (i.e final) volume of the gas can be obtained as follow:
V₁/T₁ = V₂/T₂
20/T = V₂/2T
Cross multiply
T × V₂ = 20 × 2T
T × V₂ = 40T
Divide both side by T
V₂ = 40T /T
V₂ = 40 L
Therefore, the new volume of the gas is 40 L
The elements Beryllium (Be), Magnesium (Mg), Calcium (Ca) and Strontium (Sr) are all what?
answer : alkaline earth metals ..
What are the purpose of a chemical equation check all that apply
Answer: (A,B,D) [1, 2, 4]
Explanation:
Suggest why sodium wasn’t produced until the early 19th century.
Answer:
The reason is that sodium attaches itself very strongly to other elements. Its compounds are very difficult to break apartand also because it is so reactive.
Benzene is a minor component of gasoline. The standard molar enthalpy of formation of benzene C7H16(l) is 48.95 kJ/mol. For the balanced reaction equation of benzene use:
C6H6(l) + 7.5O2 --> 6CO2 + 3H2O.
Benzene is a liquid, but all the other chemicals in this reaction are gases. What is the enthalpy change of this reaction in kJ/mol?
Answer:
-3135.47 kJ/mol
Explanation:
Step 1: Write the balanced equation
C₆H₆(l) + 7.5 O₂(g) ⇒ 6 CO₂(g) + 3 H₂O(g)
Step 2: Calculate the standard enthalpy change of the reaction (ΔH°r)
We will use the following expression.
ΔH°r = ∑np × ΔH°f(p) - ∑nr × ΔH°f(r)
where,
n: moles
ΔH°f: standard enthalpies of formation
p: products
r: reactants
ΔH°r = 6 mol × ΔH°f(CO₂(g)) + 3 mol × ΔH°f(H₂O(g)) - 1 mol × ΔH°f(C₆H₆(l)) - 7.5 mol × ΔH°f(O₂(g))
ΔH°r = 6 mol × (-393.51 kJ/mol) + 3 mol × (-241.82 kJ/mol) - 1 mol × (48.95 kJ/mol) - 7.5 mol × 0 kJ/mol
ΔH°r = -3135.47 kJ
Since this enthalpy change is for 1 mole of C₆H₆(l), we can express it as -3135.47 kJ/mol.
What does (endangered wildlife) mean ?
Answer:
Hey mate....
Explanation:
This is ur answer.....
A species considered to be facing a very high risk of extinction in the wild.
Hope it helps you,
Mark me as the brainliest...
FOLLOW ME! :)
Answer:
It means when a species in the wildlife is in danger or close to being completely extinct.
Which line (A or B) represents a faster
speed?
Answer:
A
Explanation:
Because in 1 second, line A was faster than line B.
For number 2 I need help with balancing equations and list the type of reaction plz and thank you
Answer:
Cd(NO3)2 + FeCl3 = CdCl2 + Fe(NO3)2
is an impossible equation to balance as this reaction will simply not occur and it will not work either ways
did your teacher make this ?
Which of the following are true about both the sun and the stars? Choose the three correct answers.
A.
Both are visible during the day in summer.
B.
Both move across the sky from east to west.
C.
Both change positions in the sky due to Earth's revolution.
D.
Both are visible at night in winter.
E.
Both appear in different positions in the sky due to Earth's rotation.
F.
Both move from north to south in the sky.
Answer:
D, F
Explanation:
anyone know the answer to this please?
answer it for 70 piontssssss !!!!!!!!!!
Which statement about the atomic nucleus is correct?A.The nucleus is made of protons and has a negative charge.B.The nucleus is made of protons and neutrons and has a negative charge.C.The nucleus is made of electrons and has a negative charge.D.The nucleus is made of protons and neutrons and has a positive charge.
PLEASE HELP!! IM BEING TIMED
It takes 1 frame, 1 seat, 2 pedals, and 3 wheels to make 1 tricycle. If I start with 200 frames, 200 seats, 200 pedals and 240 wheels, how many tricycles can you make? What did you run out of? What is the limiting reactant?
Answer:
80 tricycle
Explanation:
Because u need 3 wheels to for each tricycle so Ll u have to do is just divide 3 with 240 u will get 80
how does berylium apply to real life
☁️ Answer ☁️
Safety features like air bags and fire suppression sprinkler systems are maintained in a state of constant readiness, saving lives thanks to the reliability and strength of beryllium.
❤️
Beryllium is a part of many of the things you rely on each day, including cellular phones, kitchen and laundry appliances, home temperature controls, MP3 players, desktop and portable computers, and your car.
❤️
Beryllium and beryllium–containing materials are utilized extensively in many of the high tech devices (including satellites and imaging systems) used by the military to keep our citizens safe at home and abroad.
❤️
Used in high-resolution medical imaging and laser equipment, beryllium is a valuable part of the medical field’s arsenal to help you fight disease and stay healthy.
Hope it helps.
Have a nice day noona/hyung!~ ￣▽￣❤️
find the hybridization of carbon in acetone
Which of the following characterizes a reaction at equilibrium?
A. The forward reaction stops, and the backward reaction starts.
B. The forward and backward reactions are equal.
C. The forward and backward reactions stop happening.
D. The reactants are changed into products.
SUBMIT
B. The forwards and backwards motions are equal
At chemical equilibrium,the forward and backward reactions are equal and opposite.
What is chemical equilibrium?Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.
Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.
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How many electrons can beryllium lend
Answer:
2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)
10. Which best explains why the total mass of the product(s) would be less than the total weight of the
reactant(s) after a chemical reaction?
А
A physical change occurred.
B
Atoms involved in the reaction lost mass.
с
Precipitates were created in the new solution.
D
Gases were released to the atmosphere.
Answer:
D. Gases were released to the atmosphere
Explanation:
In accordance to the law of conservation of mass, the total amount of reactants must equate the total amount of products at the end of the reaction because matter can not be lost or created. However, certain changes like gas evolution, formation of precipitate etc. indicates the occurrence of a chemical reaction.
In a chemical reaction, the total mass of the product(s) would be less than the total weight of the reactant(s) because GASES, which constituted part of the mass of the reaction, WERE RELEASED INTO THE ATMOSPHERE. However, if the mass of the gas released can be accounted for, the amount of reactants and products must balance.
2 C4H10 + 13 O2 → 8CO2 + 10 H2O Which one is the Limiting Reactant
Answer:
It's a lot of calculation and it took me a bit of time
...
EXPLANATIONS
Consider the following combustion reaction: 2 C4H10 + 13 O2 ----> 8 CO2 + 10 H2O. 125 g or C4H10 react with 415 g of O2.
a.) Which mass of CO2 and H2O can be produced?
b.) Which substance is the limiting
a)
Molar mass of C4H10,
MM = 4*MM(C) + 10*MM(H)
= 4*12.01 + 10*1.008
= 58.12 g/mol
mass(C4H10)= 125.0 g
use:
number of mol of C4H10,
n = mass of C4H10/molar mass of C4H10
=(1.25*10^2 g)/(58.12 g/mol)
= 2.151 mol
Molar mass of O2 = 32 g/mol
mass(O2)= 415.0 g
use:
number of mol of O2,
n = mass of O2/molar mass of O2
=(4.15*10^2 g)/(32 g/mol)
= 12.97 mol
Balanced chemical equation is:
2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O
2 mol of C4H10 reacts with 13 mol of O2
for 2.151 mol of C4H10, 13.98 mol of O2 is required
But we have 12.97 mol of O2
so, O2 is limiting reagent
we will use O2 in further calculation
Molar mass of CO2,
MM = 1*MM(C) + 2*MM(O)
= 1*12.01 + 2*16.0
= 44.01 g/mol
According to balanced equation
mol of CO2 formed = (8/13)* moles of O2
= (8/13)*12.97
= 7.981 mol
use:
mass of CO2 = number of mol * molar mass
= 7.981*44.01
= 3.512*10^2 g
According to balanced equation
mol of H2O formed = (10/13)* moles of O2
= (10/13)*12.97
= 9.976 mol
use:
mass of H2O = number of mol * molar mass
= 9.976*18.02
= 1.798*10^2 g
Answer:
mass of CO2 = 3.51*10^2 g
mass of H20 = 1.80*10^2 g
b)
O2 is limiting reagent
Determine the molecular and empirical formulas for the substance shown in the ball-and-stick model below.