Answer: a) [tex]78.2m^2[/tex]
b) [tex]1.2\times 10m^2[/tex]
c) [tex]2.5m^2[/tex]
d) [tex]81.1m^2[/tex]
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
1. Digits from 1 to 9 are always significant and have infinite number of significant figures.
2. All non-zero numbers are always significant.
3. All zero’s between integers are always significant.
4. All zero’s preceding the first integers are never significant.
5. All zero’s after the decimal point are always significant.
The rule apply for the multiplication is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
a) [tex]24m\times 3.26m=78.2m^2[/tex]
b) [tex]120m\times 0.10m=1.2\times 10m^2[/tex]
c) [tex]1.23m\times 2.0m=2.5m^2[/tex]
d) [tex]53.0m\times 1.53m=81.1m^2[/tex]
What isotope of carbon is radioactive:
A) Carbon-12
B) Carbon-13
C) Carbon-14
D) Carbon-13 and Carbon-14
Acidity, hardness, concentration of minerals and disease-causing organisms are all factors of
a.
water availability
c.
water consumption
b.
water quality
d.
water quantity
Please select the best answer from the choices provided
A
B
C
D
Answer:
B. Water quality
Explanation:
The temperature at which the motion of particles theoretically ceases is..
A. 0 K
B. 0°C
C. -273 K
D. 273°C
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:
All atoms of oxygen have the same mass number. True or False
Answer:
pretty sure it's false
Explanation:
hope this helps!
Write the following numbers in scientific notation: a) 0.0006730 b)50000.0 c)0.000003010 d) 132.40 e)2232
Answer:
a)6.730×10⁻⁴
b)5×10⁴
c)3.010×10⁻⁶
d)1.3240×10²
e)2.232×10³
The given numbers in scientific notation are [tex]6.730 \times 10^{-4}[/tex], [tex]5.0 \times 10^4[/tex], [tex]1.3240 \times 10^2[/tex], [tex]2.232 \times 10^3[/tex] and [tex]2.232 \times 10^3[/tex], respectively.
Scientific notation is a way of expressing very large or very small numbers in a compact and convenient form.
To express a number in scientific notation, we need to write the number in the form: [tex]\rm a\times 10^b[/tex]
a) 0.0006730 can be written in scientific notation as [tex]6.730 \times 10^{-4}[/tex]. The decimal point was moved 4 places to the right, so the exponent is negative 4.
b) 50000.0 can be written in scientific notation as [tex]5.0 \times 10^4[/tex]. The decimal point was moved 4 places to the left, so the exponent is positive 4.
c) 0.000003010 can be written in scientific notation as [tex]3.010 \times 10^{-6}[/tex]. The decimal point was moved 6 places to the right, so the exponent is negative 6.
d) 132.40 can be written in scientific notation as [tex]1.3240 \times 10^2[/tex]. The decimal point was moved 2 places to the left, so the exponent is positive 2.
e) 2232 can be written in scientific notation as [tex]2.232 \times 10^3[/tex]. The decimal point was moved 3 places to the left, so the exponent is positive 3.
Therefore, [tex]6.730 \times 10^{-4}[/tex], [tex]5.0 \times 10^4[/tex], [tex]1.3240 \times 10^2[/tex], [tex]2.232 \times 10^3[/tex] and [tex]2.232 \times 10^3[/tex], are the scientific notation for the given numbers.
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A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:hope this help
Explanation:
How can I determine basic oxide from peroxide by looking
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.
Newton wrote the mathematical concepts to prove the _____ shape of planet’s orbits.
spherical
circular
triangular
elliptical
Answer:
Eliptical
Explanation:
While some orbits may seem circular, like Earth's, it is still an ellipse. Planets orbit stars in an elliptical shape, but some come very close to perfect circles. As for the other two, im certain you have never seen a triangular or spherical orbit. Hope this helps.
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.
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.
6. What is the molecular formula for this compound? The compound's empirical formula and
molar mass is given. CH20, 120g/mol
Explanation:
A compound's empirical formula tells you the smallest whole number ratio ,The molar mass tells you what the total mass of one mole
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.
Please help me! Thank you
Answer:
Elements
Explanation:
Atomic number is a property of elements
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
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 cost of an ounce of uranium
Answer:
search it up
Explanation:
“Copper pots are the best pots for cooking food quickly.” Which term best describes this statement?
Answer:
because I make eggs and they taste delicious
Answer:
Conclusion
Explanation:
Increasing the temperature of a given amount of gas at constant volume causes the pressure to increase because of _____.
1. there is less space where the molecules can move around
2. there are more molecules
3. the molecules are striking a larger area with less force
4. the molecules are moving more quickly
Many angiosperms rely on animals for
How many atoms of oxygen are in 566 g of glucose? * How many molecules are there in 43 grams of sodium hydroxide? * How many atoms of fluorine are in 5.5 x 10^24 molecules of sulfur hexafluoride? *
Answer:
See explanation
Explanation:
Number of moles of glucose in 566g = 566g/180g/mol = 3.14 moles
Number of moles of oxygen atoms in 1 mole of glucose= 6 * 16g/16g/mol = 6 moles.
There are 6 moles of oxygen in 1 mole of glucose
x moles of oxygen is therefore present in 3.14 moles of glucose
x = 6 * 3.14/ 1 = 18.84 moles of oxygen
1 mole of oxygen contains 6.02 * 10^23 atoms of oxygen
18.84 moles of oxygen contains 18.84 * 6.02 * 10^23 atoms = 1.14 * 10^25 atoms of oxygen.
Number of moles of sodium hydroxide in 43g of NaOH = 43g/40g/mol = 1.075 moles
1 mole of NaOH contains 6.02 * 10^23 molecules of NaOH
1.075 moles of NaOH contains 1.075 moles * 6.02 * 10^23 molecules / 1 mole of NaOH = 6.47 * 10^23 molecules of NaOH
Number of moles of atoms fluorine in SF6 = 6 * 19 g/19 g/mol = 6 mole of F atoms
1 mole of SF6 contains 6.02 * 10^23 molecules of SF6
x moles of SF6 contains 5.5 x 10^24 molecules of SF6
X = 5.5 x 10^24 molecules * 1/ 6.02 * 10^23 molecules
X = 9 moles of SF6
If 1 mole of SF6 contains 6 atoms of F
9 moles of SF6 will contain 9 * 6/1 = 54 atoms of F
photosynthesis uses all of the following except __ to make food ?
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.
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the first stage of an blank is when clouds form; this is the cumulus stage
Answer:
thunderstorm
Explanation: The cumulus stage is the first stage in a thunderstorm and it involves clouds forming. We see the cloud that will become a thunderstorm as it is starting to form and grow. This is due to the rising levels of thermal energy.
is boiling a physical, or chemical change?(Worth 50 POINTS!)
Answer:
It is a physical change, because you DID NOT chemically change the waters compound just by boiling it.
Explanation:
I hope this helps!
Answer:
Boiling is a physical change!
(Edited bc the person who commented told me it was physical and not to make anyone being confused when the look at this post so... yeah)
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].
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.
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What is the percent by mass of Nitrogen in Mg(NO3)2?
Answer:
18.888%
Explanation:
What is formed when polyatomic ions bond with other ions?
It would be Ionic Compounds.