Answer:
d) group 18
Explanation:
Group 18 on the periodic table consists of noble gasses, which do not chemically interact with other elements.
If you stay at 90 degrees Celsius and a gas in a liquid solution has a pressure of 2 atm, what solubility should it have if it has a solubility of 64 g/L at a pressure of 8 atm?
Answer:
im not sure
Explanation:
What is the enthalpy of reaction for the decomposition of calcium carbonate?
CaCO3(s) Right arrow. CaO(s) + CO2(g)
A 2-column table with 6 rows. Column 1 is labeled Compound with entries upper C a upper O solid, Upper C a upper C upper O subscript 3 solid, Upper C subscript 6 upper H subscript 6 gas, Upper C upper O subscript 2 gas, Upper H subscript 2 upper O gas, Upper N upper O subscript 2 gas. Column 2 is labeled Delta H subscript f in kilojoules per molecule with entries negative 157.3, negative 1,207.1, 82.90, negative 393.5, negative 241.82, 33.84.
Answer:
First Blank: 656.3 kJ
Second Blank: Endothermic
Explanation:
Edge 21'
Answer:
1. 656.3
2. endothermic
Explanation:
Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?
O selective breeding
• cloning
O artificial selection
•
gene therapy
gene therapy
Explanation:
Gene therapy, also called gene transfer therapy, the introduction of a normal gene into an individual's order to repair a mutation that causes a genetic disease.
Answer:
C artificial selection
Explanation:
Brainly please
A student was in the lab testing the conductivity of different solutions. Three of the solutions were NaNO3, Ca(NO3)2, and Al(NO3)3. Which of the solutions should be the best conductor of electricity?
Answer:
Aluminium nitrate
Explanation:
[tex]Al(NO _{3}) _{3}[/tex]
This is because there are many conducting nitrate ions compared to the other electrolytes
What is important in order for a radioisotope to provide accurate dating
results?
O A. The half-life should be similar to the age of the object.
B. The radioisotope cannot be part of a decay chain.
O C. The isotope must undergo transmutation.
O D. The item being dated must be very old.
The most important factor to be considered in order for a radioisotope to provide accurate dating simply is:
The half-life should be similar to the age of the object.
The correct answer choice is option a.
Why half-life should be similar to the age of the object in determining accurate dating of a radioisotope.Half-life of radioisotope helps in determining dating accurately simply because it helps to predict the amount of radioactive substance remaining after a given period of time.
In conclusion, it can be perfectly deduced from the explanation given above that the half-life of a radioisotope usually, frequently and most of the time helps to determine the rate at which these substances decay.
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How much energy is required to change 75 grams of copper at 35 degrees Celsius
to liquid copper at 1200 degrees C?
34950 J of energy is required to change 75 grams of copper at 35 degrees Celsius to liquid copper at 1200 degrees Celsius.
What is Specific Heat?The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.
It is given by the formula -
Q = mcΔT
where, Q = amount of heat
m = mass
c = specific heat
ΔT = Change in temperature
Given,
Mass of copper = 75g
ΔT = ( 1200 - 35) = 1165⁰C
c = 0.4 J/g ⁰C
Q = mcΔT
= 75 × 0.4 × 1165
= 34950 J
Therefore, 34950 J of energy is required to change 75 grams of copper at 35 degrees Celsius to liquid copper at 1200 degrees Celsius.
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Name the following alkyne.
Please help me <3
Answer:
D. 7-methyl-3-octyne
Explanation:
1) Identify the parent chain and name it like an alkane.
• The longest chain of carbons, which consists of the functional group (which is the alkyne group in this case: C≡C).
• There are 8 carbons in the longest chain, so it is called an octane.
2) Now, identify the location of the functional group.
• The location number of the functional group should be as low as possible. Thus although we could count from the right, we start counting from the left since the functional group is closer to the left. From the left, the functional group would be at carbon 8 while from the left, it is on carbon 3.
• Replace 'ane' with 'yne' in octane for the alkyne group.
• This would give us 3-octyne.
3) Lastly, add in the name of the branch.
• Here we have one branch, -CH₃. This is read as methyl.
• Identify the location number of the branch by counting the number of carbons in the same direction as when we counted the location number of the functional group. The methyl branch has a location number of 7.
• Adding the name of the branch before the parent chain, we would arrive at 7-methyl-3-octyne as the IUPAC name of the alkyne.
Further Explanation:
A) This option is incorrect as there are only 8 carbons in the parent chain. Although there are 9 carbons in total, the 9th carbon is taken care of in '7-methyl'.
B) Location number of the functional group should be as low as possible, so start counting the number of carbons from the left!
C) Since the functional group is an alkyne, the word 'octane' should be 'octyne' instead.
What is the number of first and last vertical column?
Answer:
Modern periodic table has eighteen (18) vertical columns. These are called groups
Select the correct answer.
A circuit is used in which process?
OA. electricity
OB. magnetism
OC. velocity
OD. gravity
Answer:
electricity
Explanation:
A circuit is used in every electrical and electronics operation.
How many moles of NaOH
would you have in a
sample that weighed 10g?
Answer: There are 0.25 moles of NaOH in a sample that weighed 10g.
Explanation:
Given: Mass of NaOH = 10 g
Molar mass of NaOH is 40 g/mol.
Number of moles is the mass of substance divided by its molar mass.
Therefore, moles of NaOH are calculated as follows.
[tex]No. of moles = \frac{mass}{molarmass}\\= \frac{10g}{40 g/mol}\\= 0.25 mol[/tex]
Thus, we can conclude that there are 0.25 moles of NaOH in a sample that weighed 10g.
Find the molarity of 4.18 g MgCI2 in 500mL of water
Answer:
The molarity of MgCl₂ in water is 0.088 mol/L.
Explanation:
The molarity of MgCl₂ can be calculated as follows:
[tex] C = \frac{\eta}{V} = \frac{m}{MV} [/tex]
Where:
C: is the molarity =?
η: is the number of moles of MgCl₂ = m/M
V: is the volume of water = 500 mL = 0.500 L
m: is the mass of MgCl₂ = 4.18 g
M: is the molar mass of MgCl₂ = 95.211 g/mol
Hence, the molarity is:
[tex] C = \frac{m}{MV} = \frac{4.18 g}{95.211 g/mol*0.500 L} = 0.088 mol/L [/tex]
Therefore, the molarity of MgCl₂ in water is 0.088 mol/L.
I hope it helps you!
How much heat, in kilojoules, is needed to raise the temperature of 236 g of silver from 8.5oC to 34.9 °C? (cAg = 0.24 J/g°C)
Answer:
1.49kJ
Explanation:
Using the formula as follows;
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass (g)
c = specific heat of silver (J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
mass of Silver (Ag) = 236g
c of Ag = 0.24 J/g°C
initial temperature (T1) = 8.5°C
final temperature (T2) = 34.9°C
∆T = T2 - T1 = 34.9 - 8.5 = 26.4°C
Using Q = m × c × ∆T
Q = 236 × 0.24 × 26.4
Q = 1,495.3 Joules
Amount of heat needed to raise the temperature of Silver (Q) in kilojoules is 1495.3/1000 = 1.4953
Q = 1.49kJ
The lower temperature of the air is there more water vapor can hold True or false. Help!!!!!
Answer:
true
Explanation:
what will litmus paper turn when it reacts with sodium nitrate?
Hey fill in the missing temperatures in this chart zoom in if you can’t see it take a screenshot or sum : Please help me will mark brainliest and be geniune .
The first organisms to arrive in an ecosystem?
What do you measure in an experiment to determine reaction rate?
Group of answer choices
A. Amount of reactants
B. Amount of products
C. Temperature
D. Time
PLS HELP ASAP NO LINKS
What type of scientist studies matter and its composition?
Biologist
Chemist
Physicist
Engineer
Answer:
.biology and maybe physics
Answer:
Biologist
ExplanationBiologist Unlike the above type of scientist, geoscientists’ work involves exploring the earth and its internal environment. They study the composition, structure, and processes of the earth by being indoors and outdoors. They contribute to the discovery of mines, petroleum deposits, minerals, and other aspects of the earth.
Beryllium hydrogen carbonate is more than 3% hydrogen by mass.
True
False
PLZ HELP!!!!!! IN YOUR OWN WORDS PLZ! :D
Imagine your cell phone rings. Describe how the sound gets transmitted from your phone to your ear, and then, from your ear to your brain. In your response, be sure to mention the type of wave that a sound wave is, the medium the sound is transmitted through before it gets to your ear, and what happens in your ear once the sound reaches it.
Answer:
SOUND WAVE (carried by thin metal inside the phone) ⇒ELECTRICAL ENERGY (over the wire) ⇒SOUND WAVE (that is heard by someone on the side of the phone)
Explanation:
What is a sound wave?A wave that is comprised of compression and refraction, by which sound is propagated in an elastic medium such as air.
How does sound get transmitted from phone to ear?
The sound waves are carried to a thin metal disk inside the phone, known as the diaphragm, and are converted into electrical energy. The electrical energy travels over wires to another phone and is converted from electrical energy to sound waves again which can be heard by the one on the other end of the phone.
How does sound get transmitted from ear to brain and what happens when sound reaches the ear?Sound waves enter the outer ear and travel through a small passageway (ear canal), which leads to the eardrum.The eardrum vibrates from the coming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones are known as the malleus, incus, and stapes.The bones present in the middle ear amplify the sound vibrations and send these vibrations to the cochlea (the snail-shaped structure that is filled with fluid present in the inner ear). An elastic separation runs from the beginning to the edge of the cochlea, splitting it into upper and lower parts. This separation is called the basilar membrane as it serves as the base on which key hearing structures sit.Once the vibrations result in the fluid inside the cochlea rippling, a traveling wave appears along the basilar membrane. Hair cells (sensory cells) sitting on top of the basilar membrane ride the wave. Hair cells near the broad end of the cochlea detect higher-pitched sounds. Those closer to the center detect lower-pitched sounds, such as a large dog barking.As the hair cells move up and down, microscopic hair-like projections (known as stereocilia) that perch on the peak of the hair cells crash against an overlying structure and bend down. Bending results in pore-like channels, which are at the tips of the stereocilia, opening up. Then chemicals rush into the cells, producing an electrical signal.The auditory nerve carries this electrical signal to the brain, which in return it into a sound that we recognize and understand.In this way, sound reaches our ears.
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Calculate the pOH for a solution with a pH of 12.34. Is the Solution acidic or basic?
Answer:
1.66 basic
Explanation:
After a drought in which all the cotton crops died, a farmer moves away. Which of the following best describes the order of growth if the farm is left abandoned?
a
Cotton --> shrubs --> tall grasses --> weeds
b
Lichen --> flowers --> shrubs --> weeds
c
Lichen --> shrubs --> weeds --> flowers
d
Weeds --> tall grasses --> shrubs --> trees
6)
Which formula can represent
an
alkyne?
A)
C₃H6
B)
C₂H4
C)
C3H4
D)
C₂H6
Answer:
c)C3H4
Explanation:
Answer: C. C3H4
Explanation:
I got it wrong and castle learning showed me the answer
Two glass rods are rubbed together. One of the glass rods are brought near (but
does not touch) an uncharged pith ball. Would you expect the pith ball to attract,
repel, or do nothing? Explain why.
Answer:
Do Nothing
Explanation:
Charges are transferred by friction when two different types of bodies are rubbed together. This is known as charging by friction.
However, when two materials of the same type are rubbed together, no charge is transferred from one object to the other hence there is no transfer of charges by friction and none of the two glass rods are charged.
Therefore, when one of the glass rods is brought close but does not touch the pith ball, nothing happens.
The kinetic molecule theory assumes that the particles of an ideal gas
Explanation:
It is assumed that the particles of an ideal gas have no such attractive forces. The motion of each particle is completely independent of the motion of all other particles. The average kinetic energy of gas particles is dependent upon the temperature of the gas.
need these 2 answered asap pls
Answer:
im not a brain wiz but i think 20
Explanation:
En una muestra de jugo de limón la concentración de H1 es de 3.8x10 a la 4 potencia ¿ cual es su PH considerando que 378= 0.58
Answer:
pH = 3.42
Explanation:
Para calcular el pH necesitamos usar la siguiente expresión:
pH = -log[H⁺]
Por tanto, solo necesitamos reemplazar el valor dado de [H⁺] en la expresión anterior y se determina su pH:
pH = -log(3.8x10⁻⁴)
pH = 3.42Por tanto el pH de la muestra de jugo de limón es 3.42
If 500 mL expandable cylinder with a pressure of 500
mmHg was filled until the volume was 1.2 atm. What is the
new volume?
Answer:
0.274 L
Explanation:
Applying Boyle's law,
PV = P'V'................. Equation 1
Where P = Initial pressure, V = Initial volume, P' = Final pressure, V' = Final volume.
make V' the subject of the equation,
V' = PV/P'............. Equation 2
From the question,
Given: P = 500 mm Hg, V = 500 mL = 0.5 L, P' = 1.2 atm = 912 mm Hg
Substitute these values into equation 2
V' = (0.5×500)/912
V' = 0.274 L
Hence the new volume is 0.274 L
Why is it appropriate to describe the Sun and its orbiting celestial bodies as a system?
As the bodies present in the gravitational force of sun, so it is appropriate to describe the sun and its celestial bodies as system.
What are celestial bodied?Celestial bodies are those objects which are present in the space not in the land.
In the space all the planets are present in their orbitals under the gravitational force of the sun and do the motion around the sun, because of that force planets are present in the orderly arrangement. Because of the revolution of the earth around the sun, seasons will change on the earth.
Hence, it is appropriate to describe the sun and its celestial bodies as system.
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How many formula units are in 325 grams of iron (III) chloride?
Answer:
1.204 × 10^24 formula units
Explanation:
Using the following formula to convert mass of iron (III) chloride to moles;
mole = mass/molar mass
Molar mass of FeCl3 = 56 + 35.5(3)
= 56 + 106.5
= 162.5g/mol
Mole = 325/162.5
mole = 2mol
Next, to calculate the formula units of FeCl3, we multiply the number of moles of FeCl3 by Avagadro number (6.02 × 10^23)
Formula units of FeCl3 = 2 × 6.02 × 10^23
12.04 × 10^23
= 1.204 × 10^24 formula units.