Checking if my answer is correct: I got LARQY, but I'm pretty sure it's wrong. Can somebody please help?
Answer:
you are right
Explanation:
and i do not need to explain it because you did
As a train rushes away from a crossing, the pitch of its horn goes down because _____________________.
a sound waves get farther apart as the source of the sound moves closer
b sound waves get farther apart as the source of the sound moves away
c sound waves get closer together as the source of the sound moves away
d sound waves stay the same distance from each other as the source of the sound moves away
Answer:
The awnser is b
Explanation:
The sound waves get smaller as the sound moves farther away, and since the sound waves are smaller, the sound is quieter. This is known as the Doppler effect.
Iron(II) chloride and sodium carbonate react to make iron(II) carbonate and sodium chloride:
FeCl2(aq) + Na2CO3(s) → FeCO3(s) + 2NaCl(aq).
Given 1.24 liters of a 2.00 M solution of iron(II) chloride and unlimited sodium carbonate,
how many grams of iron(II) carbonate can the reaction produce?
Answer:
287.68g
Explanation:
We'll begin by calculating the number of mole of FeCl2 in 1.24L of a 2M FeCl2 solution. This is illustrated below:
Molarity = 2M
Volume = 1.24L
Mole of FeCl2 =..?
Mole = Molarity x Volume
Mole of FeCl2 = 2 x 1.24
Mole of FeCl2 = 2.48 moles
Next, the balanced equation for the reaction.
FeCl2(aq) + Na2CO3(s) → FeCO3(s) + 2NaCl(aq).
Next, we shall determine the mole of FeCO3 produced from the reaction.
This is illustrated below:
From the balanced equation above,
1 mole of FeCl2 reacted to produce 1 mole of FeCO3.
Therefore, 2.48 moles of FeCl2 will also react to produce 2.48 moles of FeCO3.
Finally, we shall convert 2.48 moles of FeCO3 to grams.
Number of mole of FeCO3 = 2.48 moles
Molar mass of FeCO3 = 56 + 12 + (16x3) = 116g/mol.
Mass of FeCO3 =..?
Mass = mole x molar mass
Mass of FeCO3 = 2.48 x 116
Mass of FeCO3 = 287.68g
Therefore, 287.68g of FeCO3 were from the reaction.
How many liters of bromine are needed to produce 12 miles of aluminum bromide?
Answer:
0.929L of Br2
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2Al + 3Br2 —> 2AlBr3
Next, we shall determine the number of mole of Br2 needed to produce 12 moles of AlBr3. This is illustrated below:
From the balanced equation above,
3 moles of Br2 reacted to produce 2 moles of AlBr3.
Therefore, Xmol of Br2 will produce 12 moles of AlBr3 i.e
Xmol of Br2 = (3 x 12)/2
Xmol of Br2 = 18 moles
Therefore, 18 moles of Br2 reacted to produce 12 moles of AlBr3.
Next, we shall convert 18 moles of Br2 to grams. This is illustrated below:
Number of mole Br2 = 18 moles
Molar mass of Br2 = 2 x 80 = 160g/mol
Mass of Br2 =.?
Mass = mole x molar mass
Mass of Br2 = 18 x 160 = 2880g
Next, we determine the volume of Br2 used in the reaction as follow:
Mass of Br2 = 2880g
Density of Br2 = 3.1g/mL
Volume of Br2 =..?
Density = Mass /volume
Volume = Mass /Density
Volume of Br2 = 2880/3.1
Volume of Br2 = 929mL
Finally, we shall convert 929mL to L.
1000mL = 1L
Therefore, 929mL = 929/1000 = 0.929L
Therefore, 0.929L of Br2 were used in the reaction.
Calculate the heat required for the following two processes, and compare the results.
a. A 100.0 g sample of solid ethanol melts at its melting point. Hfus = 4.94 kJ/mol
b. A 100.0 g sample of liquid ethanol vaporizes at its boiling point. Hvap = 38.6 kJ/mol
Answer:
A. 10.74 KJ
B. 83.92 KJ
Explanation:
A. Data obtained from the question include the following:
Mass (m) of ethanol = 100g
Heat of fusion, Hfus = 4.94 kJ/mol
Heat (Q) =..?
Next, we shall determine the number of mole in 100g of ethanol, C2H5OH. This is illustrated below:
Mass of C2H5OH = 100g
Molar mass of C2H5OH = (2x12)+ (5x1) + 16 + 1 = 46g/mol
Number of mole (n) of C2H5OH =..?
Mole = Mass /Molar Mass
Number of mole (n) of C2H5OH = 100/46 = 2.174 moles.
Now, we can obtain the heat required to melt the ethanol as follow:
Q = n x Hfus
Q = 2.174 mol x 4.94 kJ/mol
Q = 10.74KJ
Therefore, 10.74 KJ of heat is required to melt the ethanol.
B. Data obtained from the question include the following:
Mass of C2H5OH = 100g
Heat of vaporisation, Hvap = 38.6 kJ/mol
Heat (Q) =..?
As calculated above, the number of mole in 100g of ethanol, C2H5OH is 2.174 moles.
The heat required to vaporise the ethanol can be obtained as follow:
Q = n x Hvap
Q = 2.174 mol x 38.6 kJ/mol
Q = 83.92 KJ
Therefore, 83.92 KJ of heat is required to vaporise the ethanol.
C. From the above calculations, a higher amount of heat energy i.e 83.92 KJ is required to vaporise the ethanol and a lesser amount of heat energy i.e 10.74 KJ is needed to melt the ethanol.
The heat required for the following two processes are:
a. 10.74 KJ
b. 83.92 KJ
Part a)
Given:
Mass (m) of ethanol = 100g
Heat of fusion, Hfus = 4.94 kJ/mol
To find:
Heat (Q) =?
Calculation for number of moles:Mass of C₂H₅OH = 100g
Molar mass of C₂H₅OH = (2x12)+ (5x1) + 16 + 1 = 46g/mol
Number of Mole = Mass /Molar Mass
Number of mole (n) of C₂H₅OH = 100/46 = 2.174 moles.
Calculation for Heat of fusion:
Q = n x Hfus
Q = 2.174 mol x 4.94 kJ/mol
Q = 10.74KJ
Therefore, 10.74 KJ of heat is required to melt the ethanol.
Part b)
Given:
Mass of C₂H₅OH = 100g
Heat of vaporization, Hvap = 38.6 kJ/mol
To find:
Heat (Q) =?
Calculation for Heat of vaporization:
As calculated above, the number of mole in 100g of ethanol, C₂H₅OH is 2.174 moles.
The heat required to vaporize the ethanol can be obtained as follow:
Q = n x Hvap
Q = 2.174 mol x 38.6 kJ/mol
Q = 83.92 KJ
Therefore, 83.92 KJ of heat is required to vaporize the ethanol.
Find more information about Heat of fusion here:
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If equal moles of hydronium ion and hydroxide react, what is the resulting solution Acidic Basic Neutral Nonpolar
Answer:
Neutral
Explanation:
1 Mole OH- = Hard Base
1 mole H3O+ = Hard Acid
2 H2O(l) ⇆ H3O+ (aq) + OH- (aq)
HSAB
Soft acids react fastest and form the strongest bonds with soft bases
Hard acids react fastest and form the strongest bonds with Hard bases
Resulting solution is definitely not non-polar as the result is H2O which is polar.
Acid: A solution that has an excess of H+ ions
Base: A solution that has an excess of OH- ions.
H2O is neutral because the concentration of hydrogen and hydroxide ions is the same.
ASAP PLSS!!! Does evaporation stops once the vapor pressure reaches a certain point?
Answer: Once the vapor pressure of the system reaches a specific level, the rate of evaporation will slow down
Explanation: I really hope this helps :) - XxJaynaJxX
Select all of the following that are equal to an impulse of 20 units.
A. Force = 0.1, time = 200
B. Force = 5, time = 5.5
C. Force = 10, time = 2
D. Force = 25, time = 0.8
impulse= force ×time
1) 0.1×200=20
2) 5×5.5=27.5
3) 10×2=20
4) 25×0.8==20
so the answers are 1,3,4
hope it helped :-)How would an increase in carbon dioxide concentration in the atmosphere change the green house effect? A. Carbon dioxide would change the greenhouse gases. B. It would make the greenhouse effect stronger. C. There would be less of a greenhouse effect. D. The greenhouse effect would stop happening.
Answer: It would make the greenhouse effect stronger :)
Explanation:
HELPPP ME PLSSS!! How many ants are in a ant hill? this is due sooo soon I need help!!
Technically this is science but it doesn't give me that option
Answer:
250,000 ants are in each colony or ant hill.
Explanation:
hope this helps!
what color would you expect a weak base to turn the paper?
Answer:
Blue litmus paper paper turns red under acidic conditions. Red litmus paper turns blue under basic or alkaline conditions. If you're using a universal indicator, the weak base should turn those blue.
Explanation:
The empirical formula for glucose is CH2). The molar mass of glucose is 180.2 grams per mole. Determine the molecular formula of glucose.
Answer:
6 CH2O which is C₆H₁₂O₆
Explanation:
The empirical formula for glucose is CH2). The molar mass of glucose is 180.2 grams per mole. Determine the molecular formula of glucose.
Formula: C₆H₁₂O₆
Empirical Formula is CH2O
Molecular Molar Mass is 180.20g/mole
Empirical Molar Mass is 30.02 g/mole
molecular formula of glucose is C₆H₁₂O₆
n = 180.20/30.02=6
n×(CH2O)
where n = molecular molar mass / empirical molar mass
So we end up with 6 CH2O which is C₆H₁₂O₆
The table describes how some substances were formed.
Substance
Description
Formed by boiling pure water
Formed by combining three hydrogen atoms to every nitrogen atom
Formed by adding 5 g of sugar to 1 L of water
Formed by compressing carbon under high pressure
R
S
Based on the given descriptions, which substance is most likely a mixture?
R
OS
What is the answer
Answer:
Formed by adding 5 g of sugar to 1 L of water
Explanation:
The substance formed by adding 5 g of suagr to 1 L of water is a mixture.
A mixture is defined as two or more substances that are physically mixed but do not react together. It thus means that the component substances of a mixture can be retrieved through appropriate means of separations.
A mixture of sugar and water can be separated by evaporation. The mixture is heated and the vapor from the boiling water can be condensed to retrieve the water while the residue will give the sugar that was initially dissolved in it.
The products formed from other descriptions in the illustration cannot be separated ordinarily and thus, are not considered to be mixture. The components have been chemically combined together.
Is the number of neutrons equal to the atomic number minus the atomic mass?
Answer:
Yes! That is trueeee
I hope this helps!!!
A molecule of an organic compound contains at least one atom of
Answer:
At least one atom contains an organic compound molecule. (1) sugars (3) sugar.
Explanation:
At least one atom contains an organic compound molecule. (1) sugars (3) sugar.
Answer is above
Hope this helps.
how many moles are in 32.3x10^24 molecules of CO2
Answer:
Explanation:
1 mole = 6.02x10^23
32.3x10^24/6.02x10^23= 53.65449 moles
53.65449 moles
Most teachers force you to worry about significant figures
53.65 moles
Sally wants to test how the type of light affects the height of bean plants. She uses three different types of light bulbs: LED, incandescent, and CFL. She exposes the plants to the lights for the
same amount of time and plants the seeds in containers that are the same size, with the same type of soil, and waters them with the same amount of water each day. She measures the height of
the plants using a ruler and records the growth each day. Which of the following is the independent variable in the experiment?
Answer:
Light
Explanation:
All of the other conditions are the same. As an example the amount of water which sally apply to each plant is the same. So the independent
variable that she is experiment on is the effects of different kinda lights on the growth of the bean plants
The source of light is the independent variable in the experiment of how the type of light affects the height of bean plants.
What is an independent variable?The independent variable is the variable that cannot be influenced or disturbed by the effect of the other factors or the characteristics of another thing present in the system.
In the experiment on how the type of light affects the height of bean plants, the light source LED, incandescent, and CFL have their own characteristics and cannot be affected by anything in the environment.
Therefore, in the experiment on how the type of light affects the height of bean plants, the source of light is the independent variable.
Learn more about independent variables, here:
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Given a formula of a functional group: An organic compound that has this functional group is classified as 1) an organic acid 2) an ester 3) a ketone 4) an aldehyde
Answer:
Since the formula of the functional group is not given in the question, here are possible answers; If it is;
1. -COOH or -CO2H, it is an organic acid
2. -COOR, it is an ester
3. RC=O, it is a ketone
4. HC=O, it is an aldehyde
Note: Check the attachment below
Explanation:
The functional group of an organic compound is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.
The most common functional groups are:
Carbonyls (C=O); which includes the aldehydes, HC=O, and ketones, RC=O
Alcohols (-OH),
Carboxylic (organic) acids (COOH),
Edters (COOR), and
Amines (NH2).
The different organic functional groups have their unique chemical formula.
Organic functional groupsThe various organic functional groups and their chemical formulas are as follows:
Organic acids - (-CO2H)
Alcohols - (-OH)
Esters - (CO2R)
Ketones - (R2C=O)
Aldehyde - ( C=O)
More on functional groups can be found here: https://brainly.com/question/14618322
What is the ability of a surface to reflect sunlight called?
Facies
Albedo
Regression
Transgression
Answer:
Albedo
Explanation:
Answer: B. Albedo
Explanation:
Albedo is the ability of a surface to reflect sunlight. The word albedo means whiteness in Latin (albus means white) - it means that objects which are colored lighter tend to be lower, and on the other hand, objects which are darker tend to be higher.
According to its periodic table entry, how many electrons does nickel have in its valence level? 2 8 16 28
Answer:
Nickel has an atomic number of 28,so it has 28 electrons
Nickel has 10 valence electrons
Answer: 16
Explanation:
A molecule of an organic compound contains at least one atom of
Answer:
Carbon
Explanation:
Answer:
carbono
Explanati
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if water absorbs 0.779j and has a mass of 0.4866g, how much would its temperature go up? a) 0.383 C b) 7.458 C c) 0.137 C d) 0.233 C
Answer:
A is the answer (0.383)
Explanation:
Formula: q=mcΔt
q=heat m=mass c=specific heat capacity Δt=change in temperature
q=0.779j m=0.4866g c=4.184j/C t=??
(waters specific heat is usually given or memorized)
0.779=(0.4866)(4.184)(?)
0.779/(0.4866)(4.184)=0.3826
Δt=0.383
Elements Electronegativity aluminum (Al) 1.61 calcium (Ca) 1 carbon (C) 2.55 chlorine (Cl) 3.16 fluorine (F) 4 hydrogen (H) 2.2 iron (Fe) 1.83 nitrogen (N) 3.04 oxygen (O) 3.44 phosphorus (P) 2.19 potassium (K) 0.82 silicon (Si) 1.9 sulfur (S) 2.58 Use the chart to determine which pair of atoms has the greatest difference in electronegativity. A. Ca – Cl B. H – Cl C. Fe – Cl D. P – Cl
Answer: The highest difference is in between N and H thus this will have greatest polarity.
Explanation:More the electro-negativity between any two elements more the polarity in the bond. Electron negativity is the tendency to pull shared pair of electrons towards it self. If the difference between two bonded elements is way too high then it may result in complete transfer of electrons from the less electronegative element to more electronegative one. Thus the bond will be ionic and highly polar.
Among given options,the electro negativity differences are:
A) Al-Si : 1.9-1.61= 0.29
B) S-Cl : 3.16- 2.58 = 0.58
C) N-H : 3.04 - 2.2 = 0.84
D) C-N : 3.04-2.55 = 0.49
The highest difference is in between N and H thus this will have greatest polarity.
When a current-carrying wire is wrapped around an iron core, what can it create?
A. an aurora
B. a magnet
C. a generator
D. a motor
The gravitational Strength on earth is less than the gravitational strength on Neptune. Which statement is correct?
Answer:
this one earth is less than the gravitational strength on Neptune
Explanation:
What is the relation between temperature and rate of reaction ?
Answer:
Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction
Explanation:
When we increase the temperature of one of the reactants in a chemical reaction, this increases the particles kinetic energy, making them move much faster than they were before. This also increases the chance of a more successful collision and the rate of reaction.
1. Write a balanced equation for the:
a. alpha decay of lead-210
b. beta decay of chromium-55
c. capture of an electron by bromine-76
Answer:
210 82Pb-----> 206 80Hg + 4 2 He
55 24 Cr----->55 25 Mn + 0 -1 e
76 35 Br + 0 -1 e-----> 76 34 Se
Explanation:
Alpha decay occurs with atoms having high atomic number number. As the atomic number increases, the repulsions between the protons make the nucleus unstable. A point is reached where the attractive forces in the nucleus are unable to hold the nucleons together anymore. Part of the nucleus now breaks off as an alpha particle or a helium nucleus.
Beta decay involves the transformation of a neutron to a proton, electron and neutrino. It decreases the neutron-proton ratio.
The capture of an orbital electron converts a proton into a neutron with the emission of a neutrino. The atomic number of the product nucleus decreases. Orbital electron capture increases the neutron-proton ratio.
The acceleration of the car with the data in the table above would be m/s2. If the applied force were cut in half, what do you predict the acceleration would be? m/s2
Answer:
1. 0.33 2. 0.1 7
Explanation:
I need help with this ASAP! Please help me, thank you. Please answer these questions. Use the time zone map.
1)Daniel and Jody are flying to Massachusetts for a wedding. If their plane leaves California at 7:00 a.m. PST and lands in Massachusetts at 3:30pm EST, what time will it be in California when they arrive?
2)If a live New Year's Eve TV special begins broadcasting at 10:00 pm EST in New York, what time should viewers in Oregon tune in? 3)Chance wants to wish his cousin a happy birthday at 9:00am CST. Chance lives in Texas and his cousin lives in Ohio. What time will it be at his cousin's house when Chance calls to say happy birthday?
Answer:
see below
Explanation:
1) Since PST is 3 hours behind EST it will be 3:30 - 3 = 12:30 pm PST.
2) Oregon is in PST and NY is in EST so it'll be 10 - 3 = 7 pm in Oregon.
3) Ohio is in EST and Chance is in CST so it'll be 9 + 1 = 10 am in Ohio.