Answer:
0.047
Explanation:
Data : 5g , Na2CO3
Formula:
Molecular mass of Na2Co3 = no.of atomic mass x no. of atom
moles = mass÷ molecular mass
molecular mass = 2(23)+1(12)+3(16)
=106amu
moles = 5÷106
= 0.047 Ans:
a material has volume 4.52m^3 and density 8.61kg/m^3. the mass of this material in scientific notation is 3.89 X 10^2 g
is it true or false?
Temperature is not a direct measure of thermal energy of a system the total energy depends on its temperature and what other factors?
Answer:
See explanation
Explanation:
There are two main factors that affect the magnitude of thermal energy of a system.
The thermal energy of a system depends on
i) Temperature of the body
ii) Mass of the body
Thus, the greater the mass of a substance at a particular temperature, the greater its thermal energy. Also, at a higher temperature, an object has greater thermal energy.
Which family on the periodic table has elements whose electron configurations end in
p4?
Answer:
Elements Ending with s2p4 = the Oxygen Family
Element Atomic Number
Oxygen (O) 8
Sulfur (S) 16
Selenium (Se) 34
Tellurium (Te)
Explanation:
There are 12 inches in 1 foot and 2.54cm in 1 inch. How many feet are in 325 cm?
Answer:
27.0833 feet
Explanation:
how many oxygen molecules are in 5.17g of oxygen gas
Answer:
is cool is cool goodcripopo
Pls help me its due in 20 minutes.
Answer:
11. 1, 4.5
12. right; 4.5 > 1
13. 10, 3
14. left; 10 > 3
Explanation:
All you're being asked to do is count the squares in the pictures.
11. The number of squares for the left wave from bottom to top is 2, so the amplitude is 1/2 that, 2/2 = 1. For the right wave it is 9 squares from bottom to top, so the amplitude is 9/2 = 4.5.
left amplitude: 1, right amplitude: 4.5
__
12. The right wave has greater amplitude. Evidence: 4.5 > 1. It also takes up more vertical space in the picture.
__
13. It is difficult to determine the wavelength of the left wave, because two full peaks are not shown. If we try to match corresponding points, they appear to be about 10 squares apart.
The right wave has 2 peaks in 6 squares, so about 3 squares between peaks.
left: wavelength 10, right: wavelength 3
__
14. The left wave has greater wavelength. Evidence: 10 > 3.
Answer:
11. 1, 4.5
12. right; 4.5 > 1
13. 10, 3
14. left; 10 > 3
Explanation:
What does it mean for a solution to be saturated?
A. The solute will not dissolve in the solvent.
B. The solution contains more solute than should be possible.
C. More solute can still be added to the solution.
D. The maximum amount of solute is dissolved in it.
Answer:
D. The maximum amount of solute is dissolved in it.
Answer:
D. The maximum amount of solute is dissolved in it.
Explanation:
What type of reaction is shown here?
Al(OH)3 ---> Al2O3 + H2O
Answer:
Chemical Equation Balancer
Explanation:
I NEED YALLS HELP ILL BRAINLIST/5 Star !! Answer in full sentence if u can.
In the Bohr model of the atom, what is the maximum number of electrons that the second electron shell can contain?
What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?
43%
73%
29%
57%
Answer:
i think it is 43
Explanation:
hope it helps:0
Which of these pair of elements has the GREATEST electronegativity:
Calcium (Ca)
or Selenium (Se)
Answer:
huhubbibgguvulvyjbkffkfj Leonel kg feliz flaco filtro usted conviví cuando bb cuerpecito uiyfjuufuvhnvhohh igual
The three properties of objects are:
Answer:
they have shape.
they have volume.
they occupy space.
David pushes the wall to the left with his finger. The
wall pushes David to the right. What is the action
force and what is the reaction force?
Answer:
push or pull
Explanation:
What is a chemical symbol? Give an example.
Answer:
zero two is bae
Explanation:
How much heat must be added to raise a sample of 100.g of water at 270K to 280K?
Answer:
10 Kelvin
Explanation:
this is so simple...
if you want to raise the temp from 270K to 280K just add 10K
According to specific heat capacity, 4200 joules of heat must be added to raise a sample of 100.g of water at 270 K to 280 K.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT , on substitution of values on given formula, Q= 100×4.2×10=4200 Joules
Thus, 4200 joules of heat must be added to raise a sample of 100.g of water at 270 K to 280 K.
Learn more about specific heat capacity,here:
https://brainly.com/question/29766819
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What mass to the nearest tenth of a gram, is needed to balance this chemical
reaction equation?
16AI
+
35
-
8AIS
8
2 3
+
7.4 g
24.5 g
24.5 g
o
17.1 g
131.99
None of the above
none of the above. is the answer
Help ASAP pls will make brianlist
Answer:a+b
Explanation:
What factor affects the color of a star?
Answer:
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Explanation:
Answer:
1) color of a star is determined by its temperature. 2) the luminosity is determined by its size.
Explanation:
Questlon 5 of 5
What is the main source of energy for plants?
A. Oxygen
B. Water
C. Soil
D. Sunlight
Answer:
D Sunlight
Explanation:
Hoped that helped :)
Can someone pls help me?
Answer:
17
Explanation:
what is the independent variable
How do most cells in your body sense their surroundings?
O they touch things
O they see things
they smell things
they hear things
O all these answers are correct
Explain in your own words. What does DNA mean?
Answer:
DNA aka deoxyribonucleic acid is a molecule in cells that holds genetic information. Their main job is to tell the cell what type of protein to make. The other instructions they hold for the organism is instructions on how to develop, survive and reproduce.
Explanation:
DNA is the genetic material made of two polynucleotide chains that coil around one another to create a double helix is called deoxyribonucleic acid (DNA).
All known organisms and many viruses have genetic information in the polymer that is necessary for their development, operation, growth, and reproduction. Nucleic acids include ribonucleic acid and DNA.
DNA is the genetic material found inside bodily cells that contribute to an individual's unique genetic makeup. Similar to the game's code or a home's blueprints, it contains the directions for creating the body.
Learn more about DNA, here:
https://brainly.com/question/30006059
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While both comets and asteroids are found to orbit the Sun in our Solar System, which choice correctly explains how they are different?
Comets are much larger than asteroids.
Asteroids form a tail, and comets do not.
Asteroids have long orbits around the Sun. Comets orbit between Mars and Jupiter.
Comets are made of ice, dust, and rocky material. Asteroids are made of rock and metal material.
Answer:Comets are made of ice,dust,and rocky material.Asteroids are made of rock and metal material
Answer:
D
i think
Explanation:
Im giving big points for this and if you answer correctly I will give brainliest.
Answer:
[tex]\boxed {\boxed {\sf 447,560 \ Joules}}[/tex]
Explanation:
We are asked to find the energy required to melt 1340 grams of ice. We are given this formula:
[tex]Q=mL[/tex]
In this formula, Q is the heat, m is the mass, and L is the latent heat.
For this problem, the mass is 1340 grams of ice. Since we want to melt the ice, we need the latent heat of fusion (melting) which is 334 Joules per gram.
[tex]m= 1340 \ g \\L= 334 \ J/g[/tex]
Substitute the values into the formula.
[tex]Q= (1340 \ g )( 334 \ J/g)[/tex]
Multiply. The grams will cancel each other out.
[tex]Q=1340 *334 \ J \\Q=447560 \ J[/tex]
447,560 Joules of energy are needed to melt 1340 grams of ice.
HELP!
A train travels 102 miles in 2 5/6 hours. What is its average speed in miles per hour?
Answer:
36miles/hour
Explanation:
speed =distance÷time taken
102miles/2 5/6
102÷17/6
102×6/17
=36miles per hour
What is the charge of the oxygen ion when it has a filled outermost energy level?
A. 2+
B. 2-
C. 1-
D. 1+
What is the natural reason for the rising surface temperatures of the Pacific Ocean, drought in the western United States, and flooding on the Pacific coast of South America? Is it the Jet Stream, the Gulf Stream, La Niña, or El Niño? This is a science question about weather.
Answer:
El Niño
Explanation:
The natural reason for the rising surface temperatures of the Pacific Ocean, drought in the western United States, and flooding on the Pacific coast of South America Is the El Niño.
El Niño is a climate pattern that happens when there is an unusual warming of the surface temperatures of the Pacific Ocean. This occurs at an interval of two to seven years
During El Niño, the surface waters of the Pacific Ocean become warmer than average and this is as a result of the weakness of trade winds which blows over the entire Pacific Ocean. This makes the atmospheric pressure above the ocean to decrease.
El Niño brings rainfall nd flooding to South America and droughts in the western United States
2. How many formula units in 7.25 moles of Al2O3
Answer:
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Explanation:
Help me pleaseee
C3H8 (g) + 5 O2 (g)
->
3 CO2 (g) + 4 H2O (9)
1. Use stoichiometry to determine how many moles of O2 are needed
to completely react with 2.25 moles of C3H8.
Answer: 11.25 moles of [tex]O_2[/tex] will be required to completely react with 2.25 moles of [tex]C_3H_8[/tex].
Explanation:
The balanced chemical equation is:
[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)[/tex]
According to stoichiometry :
1 mole of [tex]C_3H_8[/tex] require = 5 moles of [tex]O_2[/tex]
Thus 2.25 moles of [tex]C_3H_8[/tex] will require=[tex]\frac{5}{1}\times 2.25=11.25moles[/tex] of [tex]O_2[/tex]
Thus 11.25 moles of [tex]O_2[/tex] will be required to completely react with 2.25 moles of [tex]C_3H_8[/tex].
Mr. Wang works in a recycling center. Recyclable materials arrive at the center mixed. Workers use magnets to separate steel cans from other items. Which two statements are true about the force between a steel can and a magnet?
Answer:
Option 3, The attraction between the can and the magnet is a pull.
Explanation:
The complete question is
Mr. Wang works in a recycling center. Recyclable materials arrive at the
center mixed together. Workers use magnets to separate steel cans from
other items. Which two statements are true about the force between a steel can and a magnet?
1 Gravity pushes the can toward the magnet.
2 The force between the can and the magnet is a noncontact force.
3 The attraction between the can and the magnet is a pull.
4 The attraction between the can and the magnet is a push
Solution
The force exerted by magnet on steel is the pull force. In magnets unlike poles attract each other (pull force) while the like poles repel (push force). Now, the steel or any ferrous object in the garbage when experience magnetic field develop magnetic field of their own in such a way that their north always faces the south of the external magnet or vice versa.
Hence, the force between a steel can and a magnet is pull force