Answer:
A. Nucleus
Nucleus is the answe
Brianna explains to Logan the role of plants in the carbon cycle. Choose the sentence(s) that she includes in her explanation. Select all that apply.
A.
Animals get carbon from plants.
B.
Plants take carbon from the soil.
C.
Photosynthesis uses carbon monoxide.
D.
Animals take carbon from the atmosphere.
E.
Plants take carbon from the atmosphere.
Answer:
E) Plants take carbon from the atmosphere
Explanation:
Plants are a vital part in keeping the air clean. They take in CO2, H2O, and sunlight to start processing photosynthesis. The carbon taken in by the plant still remains with it after it dies, thus, fossil fuels.
Answer:
e is correct
Explanation:
24. What type of cloud is in the picture?
cumulus
cirrus
altostratus
stratus
Explanation:
alto cumulus is the pic
the rate of effusion of co2 gas through a porous barrier is observed to be 9.31x 10^-4 mol/h. under the same conditions, the rate of effusion of N2 gas would be _______ mol/h
Answer:
[tex]1.167\times 10^{-3}\ \text{mol/h}[/tex]
Explanation:
[tex]R_1[/tex] = Rate of diffusion of [tex]CO_2[/tex] = [tex]9.31\times 10^{-4}\ \text{mol/h}[/tex]
[tex]R_2[/tex] = Rate of diffusion of [tex]N_2[/tex]
[tex]M_1[/tex] = Molar mass of [tex]CO_2[/tex] = 44.01 g/mol
[tex]M_2[/tex] = Molar mass of [tex]N_2[/tex] = 28.0134 g/mol
From Graham's law we have the relation
[tex]\dfrac{R_1}{R_2}=\sqrt{\dfrac{M_2}{M_1}}\\\Rightarrow R_2=\dfrac{R_1}{\sqrt{\dfrac{M_2}{M_1}}}\\\Rightarrow R_2=\dfrac{9.31\times 10^{-4}}{\sqrt{\dfrac{28.0134}{44.01}}}\\\Rightarrow R_2=1.167\times 10^{-3}\ \text{mol/h}[/tex]
The rate of effusion of the [tex]N_2[/tex] gas would be [tex]1.167\times 10^{-3}\ \text{mol/h}[/tex].
Sodium bicarbonate (NaHCO3) is commercially known as baking soda. How many grams and atoms of oxygen are there in 15 grams of sodium bicarbonate? The molar mass of NaHCO3 is
84.01 g/mol.
Answer:
3 atoms of O
8.57g
Explanation:
The problem here is to find the mass of oxygen in the compound and the number of atoms of oxygen.
The formula of the compound is:
NaHCO₃;
Here we have:
1 atom of Na
1 atom of H
1 atom of C
3 atoms of O
So there are 3 atoms of O
To find the mass of oxygen , we use the molar mass of oxygen;
Molar mass of oxygen = 16g/mol
Mass of oxygen = [tex]\frac{3(16)}{84.01}[/tex] x 15 = 8.57g
Why do you think the moon looks different in these two images ?
Image 1 shows that the sun is travelling from the left while image 2 shows that the sun is travelling from the right.
What does the image show?We know that the solar system is composed of the sun and the planets. The planets move round the sun in concentric circles and the sun is the focus. This is the heliocentric model of the solar system.
The moon is also a part of the celestial bodies and the light from the moon is dependent on the direction of the movement of the sun. We have to recall that the moon is a non luminous object.
Learn more about the moon:https://brainly.com/question/13538936
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Explain, in your own words, what volumic mass is
Answer:
The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used.
If a sample of gas of valume 605 mL and temperature of 39 OC, has 0,00803 moles. What is it’s pressure?
Answer: The pressure of the gas is 0.34 atm
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = ?
V = Volume of gas = 605 ml = 0.605 L (1L=1000ml)
n = number of moles = 0.00803
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]39^0C=(39+273)K=312K[/tex]
[tex]P=\frac{nRT}{V}[/tex]
[tex]P=\frac{0.00803\times 0.0821 L atm/K mol\times 312K}{0.605L}=0.34atm[/tex]
The pressure of the gas is 0.34 atm
how glass tube filed with acidified potassium dichromate detect drunken driver
Answer:
See explanation
Explanation:
The reaction between alcohol and acidified potassium dichromate is a redox reaction. This reaction can be used to detect a drunken driver.
Alcohols can be oxidized to aldehydes, ketones and carboxylic acids depending on the structure of the alcohol. Primary alcohols yield adehydes and carboxylic acids while secondary alcohols are oxidized to ketones.
The colour of the acidified potassium dichromate turns from orange to green when exposed to alcohols from the breath of a drunken driver.
To investigate the reactivity of metals a student uses four metals. Each time they added 1 g of the metal to 25 cm³ of sulfuric acid and record the temperature change. Identify the control variables in this example
Answer:
Volume of the sulfuric acid (25cm³), same mass of each metal (1g)
Explanation:
In an experiment, the CONTROL VARIABLE also known as constant is the variable that is kept unchanged for all groups in an experiment. This is done in order not to influence the outcome of the experiment.
In this case, students are trying to investigate the reactivity of four different metals. They added 1 g of each metal to 25cm³ of sulfuric acid and recorded the temperature change. Based on the explanation of control variable above, the VOLUME OF SULFURIC ACID (25cm³) and the MASS OF EACH METAL (1g) are the CONTROL VARIABLES because they are the same or unchanged in this experiment.
What does the salinity of seawater represent?
The concentration of salt dissolve in the ocean
The concentration of all dissolved chemicals in the ocean
The volume of salt in the ocean
the mass of salt in the ocean
Answer:
Salinity is a measure of the 'saltiness' of seawater, or more precisely the amount of dissolved matter within seawater.
Is this statement an example of an observation or conclusion?
"Country music is the best kind of music."
A.)Observation
B.)Conclusion
Answer:
Answer:
B.) conclusion
How can I determine basic oxide from peroxide by looking
convert 34 g of glucose to Liters of glucose. PLEASE HELP!!
Answer:
0.034 Liters
Explanation:
What biomolecule is considered the "instruction manual for
life"?
Chloroplast
Mitochondria
DNA
Help ASAP thank you!
What is the energy of a photon with a frequency of 5.90 × 10¹⁴ s⁻¹? (h = 6.626 × 10⁻³⁴ J • s)
BRAINLIEST PLEASEEE HELPLP 5. In a lab experiment, 2.5 grams of sodium bicarbonate is heated and decomposed into
sodium carbonate, carbon dioxide, and water vapor when heated. The actual yield of
sodium carbonate produced in the experiment is 2.04 grams. The theoretical yield of
each product is recorded in the data table below.
Using this data, determine the percent yield for sodium carbonate?
(Round Your Answer to the Nearest Whole Number)
Answer:
Explanation:
Sodium bicarbonate,
NaHCO
3
, will decompose to form sodium carbonate,
Na
2
CO
3
, water, and carbon dioxide,
CO
2
2
NaHCO
3(s]
→
Na
2
CO
3(s]
+
CO
2(g]
+
H
2
O
(g]
Notice that you have a
2
:
1
mole ratio between sodium bicarbonate and sodium carbonate. This means that the reaction will produce half as many moles of the latter than whatever number of moles of the former underwent decomposition.
Use sodium carbonate's molar amss to determine how many moles you'd get in that sample
0.685
g
⋅
1 mole NaHCO
3
84.007
g
=
0.008154 moles NaHCO
3
Now, if the reaction were to have a
100
%
yield, it would produce
0.008154
moles NaHCO
3
⋅
1 mole Na
2
CO
3
2
moles NaHCO
3
=
0.004077 moles Na
2
CO
3
Use the molar mass of sodium carbonate to determine how many grams would contain this many moles
0.004077
moles
⋅
105.99 g
1
mole
=
0.4321 g Na
2
CO
3Sodium bicarbonate,
NaHCO
3
, will decompose to form sodium carbonate,
Na
2
CO
3
, water, and carbon dioxide,
CO
2
2
NaHCO
3(s]
→
Na
2
CO
3(s]
+
CO
2(g]
+
H
2
O
(g]
Notice that you have a
2
:
1
mole ratio between sodium bicarbonate and sodium carbonate. This means that the reaction will produce half as many moles of the latter than whatever number of moles of the former underwent decomposition.
Use sodium carbonate's molar amss to determine how many moles you'd get in that sample
0.685
g
⋅
1 mole NaHCO
3
84.007
g
=
0.008154 moles NaHCO
3
Now, if the reaction were to have a
100
%
yield, it would produce
0.008154
moles NaHCO
3
⋅
1 mole Na
2
CO
3
2
moles NaHCO
3
=
0.004077 moles Na
2
CO
3
Use the molar mass of sodium carbonate to determine how many grams would contain this many moles
0.004077
moles
⋅
105.99 g
1
mole
=
0.4321 g Na
2
CO
3
By using the given data, the percent yield for sodium carbonate (Na₂CO₃) is equal to 127.
How to calculate percent yield?Percent yield of any data can be calculated as:
% yield = (Actual value / Theoretical value) × 100
In the question actual yield of sodium carbonate is given, which is equal to 2.04 grams. And in the table theoretical yield of sodium carbonate also given, which is equal to 1.60 grams.
Now putting these value in the above equation, we get:
% yield = (2.04 / 1.60) × 100 = 127
Hence, percent yield of sodium carbonate (Na₂CO₃) is 127.
To learn more about percent yield, visit the below link:
https://brainly.com/question/11963853
What is formed when polyatomic ions bond with other ions?
It would be Ionic Compounds.
how does the earth give us what we call and night
Answer:
the Earth rotates on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. it takes 24 hours for the world to turn all the way around, and we call this a day.
Explanation:
ScF2 +
KBr ---->
KE +
ScBr2
Balanced equation :
ScF₂ + 2KBr ⇒ 2KF + ScBr₂
Further explanationGiven
Reaction
ScF₂ + KBr ⇒ KF + ScBr₂
Required
Balanced equation
Solution
1. Give coefficient
ScF₂ + aKBr ⇒ bKF + cScBr₂
Sc, left=1, right=c⇒c=1
F, left=2, right=b⇒b=2
K, left=a, right=b⇒a=b⇒a=2
The equation becomes :
ScF₂ + 2KBr ⇒ 2KF + ScBr₂
HELPPPPPPPPPP
IDENTIFY THE ELEMENT WHICH HAS A GREATER ATOMIC MASS FLOURINE OR CLOURINE
Answer:
Cu Copper 63.546
Cl Chlorine 35.453
F Fluorine 18.998403
Explanation:
I don't know whether you asked for Cu or Cl so answered it both.
Calculate the molar mass of Fe2(SO4)3. Then Calculate the mass of iron(III) sulfate of 4.05x10^23 formula units. Work must be shown.
Answer:
Molar mass: 399.9 g/mol
The mass of iron(III) sulfate is 269 grams.
Explanation:
First of all, you have to find the molar mass of Fe2(SO4)3.
So you find the molar first for each element
Fe = 55.8 amuS = 32.1 amuO = 16.0 amuHowever, there are 2 iron atoms, 3 sulfur atoms, and 12 oxygen atoms.(Don't forget the 3 outside the parenthesis of SO4).
So you do this
55.8(2) + 32.1(3) + 16.0(12) = 399.9So the final answer is 399.9 g/mol
Second of all, if you want to find the mass of Fe2(SO4)3, you have to convert from formula units to moles. After that, then you convert from moles to grams.
If you want to convert from molecules to molecules, you have to use Avogadro's number. Avogadro's number is 6.02 x 10^23. Then if you want to convert from moles to grams, you use the molar mass. We already know that the molar mass is 399.9 g/mol.
Therefore, now use dimensional analysis to show your work.
(4.05 x 10^23) formula units of Fe2(SO4)3 * 1 mol/ 6.02 x 10^23 formula units * 399.9 g/mol / molFormula units in the beginning and the moles will cancel out.
So [(4.05 x 10^23) / (6.02 x 10^23)] x 399.9 = 269.0357143But we need to use significant figures with the least digits(which is 4.05) So we round to the nearest whole number.
269.0357143 = 269So the final answer for the mass of iron(III) sulfate is 269 grams(don't forget the units).
Hope it helped!
What is the role of the nervous system?
Answer:
Explanation:
The major regulation, regulatory, and communicating system in the body is the nervous system. It is the foundation of all mental operation, including thinking, learning, and memory. The nervous system, along with the endocrine system, is responsible for controlling and sustaining homeostasis.
Heat is transferred in all but which way.
Select one:
a. convection
b. sublimation
c. conduction
d. radiation
Btw I know it’s science but chem was closest thing to that
What isotope of carbon is radioactive:
A) Carbon-12
B) Carbon-13
C) Carbon-14
D) Carbon-13 and Carbon-14
Please dear lord help me I can’t solve it
What is in the solar system?
A. All the above
B. asteroids and comets
C. The sun and everything thing that orbits around it
D. planets and their moons
PLEASE HELP
Answer:
all of the above
Explanation:
all of this is in the solar system
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A.
It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
B.
It is a solar eclipse, in which the Earth casts a shadow on the Moon.
C.
It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D.
It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
it is option c liner eclipse
Answer:
A-It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
Someone please help !
PLEASE HELP. WILL GIVE BRAINLIEST AND QUESTION WORTH A 100 POINTS. NEED ANDWER ASAP!
Conclusion: In a paragraph, describe how physical and chemical properties help us
identify the difference between metals, nonmetals and metalloids. Discuss
characteristics that metals have in common, characteristics that nonmetals have in
common, and characteristics that metalloids have in common.
Answer:
extensive properties such as mass and volume depend on something like perhaps the amount of what's measured. physical properties can be measured without changing substance chemical identity.
metals are the elements which exhibit degree of metallic behavior is know as metals. non metals are such elements which do not posses any metallic behavior and mekkloids are those elements that posses some of the properties like metal. but they act either like metals or non metals n they also have the same physical properties
5. Why is it necessary to regularly test the pH of pool
water?
Answer:
To ensure that everyone enjoys using your pool, it is important to keep the swimming pool pH levels in balance at all times. If the pH is too high, it could cause skin irritation and corrode metal parts on the pool. If the pH is too low, it could create a situation where the chlorine in the pool isn't as effective.
Explanation:
Answer:
I don't see multiple choice, so I'll answer this based on what I have learned on my free time.
Explanation:
Usually, when a ton of Urine is in a pool, it can throw off the Ph balance, and can even damage human eyes. Trust me, it's happened to me one time. my eyes burned like fire.