How many moles are equal to 145 g of sodium carbonate?
Answer:
There are
0.0642 mol Na
2
CO
3
in
6.80 g
.
Explanation:
The chemical formula of sodium carbonate is
Na
2
CO
3
. The molar mass of sodium carbonate is
105.988439 g/mol
.
How do I graph these question
a. Explain why bicycle tires seem higher in the summer than in winter.
b. Explain why a can of soda pop explodes if left in the hot sun.
c. A rigid container filled with a gas is placed in ice (ex. nalgene bottle). What will happen to the pressure of the gas? What do you think will happen to the volume?
d. An infected tooth forms an abscess* that fills with gas. The abscess puts pressure on the nerve of the tooth, causing a toothache. While waiting to see a dentist, the person with the toothache tried to relieve the pain by treating the infected area with moist heat. Will this treatment help? Why or why not?
Heat and temperature are related, but they are not the same thing. Heat is a form of
energy called thermal energy. Objects are composed of molecules, which move around.
When molecules gain energy, they move even more. Every object on Earth has thermal
energy. That's because even the molecules inside very cold objects are not perfectly still,
Temperature is a measure of the intensity of an object's thermal energy. It tells us the
average amount of thermal energy an object has. This is why a small hot object can have a
higher temperature but less thermal energy than a large cold object.
Based on the passage, an object with a lot of thermal energy
А
might be cold but very small
B
might be cold but very large.
is always large
is always small.
To quote the passage: "...a small hot object can have a
higher temperature but less thermal energy than a large cold object."
In other words, a small object can have a high average thermal energy, and therefore a high temperature, but since the object is smaller, the magnitude of thermal energy present in the object is by default less than that in the larger object. As the passage indicates, every object has thermal energy. So, despite the fact that the larger object is colder, it still has a greater thermal energy due to the number of molecules that comprise the larger object.
Answer:Based on the passage, an object with a lot of thermal energy might be cold but very large.
Examine the chemical reaction. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation? 3 5 7 10
Answer:
5
Explanation:
The correct coefficient of oxygen is 5.
The question is incomplete, the complete question is;
Examine the chemical reaction C3H8 + O2----> 4H2O + 3CO2. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation?
A: 3
B: 5
C: 7
D: 10
The principle of balancing chemical reaction equation is that the number of atoms of each element at the right hand side of the reaction equation must be equal to the number of atoms of the same element at the left hand side of the reaction equation.
Given the reaction; C3H8 + O2----> 4H2O + 3CO2, it will only become balanced when the coefficient of O2 is 5.
Hence, we can write; C3H8 + 5O2----> 4H2O + 3CO2
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I WILL GIVE BRANLIEST What factor is the temperature in an ecosystem? Abiotic or Biotic?
Answer:abiotic .
Explanation:
01:44:12
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
compare with the temperature at the end of the change?
Temperature vs. Time
140
4
100
80
Temperature (°C)
3
30
40
20
2
0
20
Time (min)
The temperature is always lower
The temperature is always the same
The temperature is usually lower
The temperature is usually higher
Which of the following sets of forces acting on an object will result in the object moving?
5 Newtons Up and 5 Newtons Down
31 Newtons Left and 32 Newtons Right
0 Newtons Up and 0 Newtons Down
9 Newtons Left and 9 Newtons Right
Answer:
31 N left and 32 N right because
Explanation:
It’s the only one movement because when you subtract them there’s still 1 left
Which of the following best describes a vacuum?
Hot
Cold
Shiny
Empty
Answer:
hot
Explanation:
Answer:
The Answer is (Empty)
define vapor pressure
Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature
Can someone please help me with this?-- 20 pts!
Oxygen has six valence electrons, and an electronegativity of 3.44. Calcium has two valence electrons and an electronegativity of 1.00.
How can the octet rule be used to explain the bonding between them?
Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form an ionic bond.
Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form a covalent bond.
Oxygen needs to lose six electrons to reach a full octet. Each calcium atom needs access to six electrons to achieve a full octet. One oxygen atom donates all its electrons to calcium, forming an ionic bond.
Oxygen needs to lose six electrons to reach a full octet. Each calcium atom needs access to six electrons to achieve a full octet. One oxygen atom donates all its electrons to calcium, forming a covalent bond.
Answer:
Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form an ionic bond.
Explanation:
The bond between oxygen and calcium must be ionic given the fact that the electronegativity difference between them is about 2.44.
Calcium prefers to loose two electrons while oxygen receives these two electrons hence the both atoms attain the octet structure.
Recall that an ionic bond is formed by the loss and gain of electrons by two bonding atoms (complete transfer of electrons). Thus the bond between each calcium and oxygen atom is ionic.
What is formed by the hydrolysis of Starch?
Answer:
soluble starch, maltose and various dextrins.
Explanation:
why is oiling done time and again in a sewing machine
Answer:
Oiling is done on a regular basis to sewing Machine because in the machine there are lots of machinery parts i.e. wheels and axels, etc. which are in continuous use and they possess so much frictional force between them that wear tear may be observed in those parts.
For Frictionless sewing
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
What will happen to the flow of blood in blood vessels (pulse) if heart beat rate increase
Answer:
"Low levels of the hormone epinephrine, also called adrenaline, cause blood vessels to relax and widen. High levels of this same hormone, along with the hormone norepinephrine, cause the blood vessels to narrow and the heart rate to rise, increasing blood pressure."
Explanation:
What else is produced during the combustion of butane, C4H10?
2C4H10 + 13O2 8________ + 10H2O
Answer:
CO2
Explanation:
(b) A atom T has atomic number 11 and mass number 23. How many (I) protons does it have?
Answer:
There are 11 protons in an atom T.
Explanation:
In chemistry, the scientific word for proton is also known as atomic number so the proton number will be 11.
Answer:
11
Explanation:
Jorge conducted an experiment, and included the graph shown below as part of his lab report.
TEMPERATURE CHANGES DURING
CHANGES OF STATE OF WATER
140
120
9 100
Temperature (C)
80
60
20
--20
0
20
80
100
Jorge's experiment involved which of the following?
A chemical change.
The formation of a new substance.
A change in the chemical properties of a substance.
A physical change.
Answer:physical change
Explanation:
Can someone please help me with this?
Answer:
Lonic.an electron will be transferred from potassium to the chlorine atom
[tex]\huge\boxed{Option C}[/tex]
_____________________________________IONIC BOND:Ionic bond is a type of bond which is formed between metals and non-metals. The group which provide the Metal are IA and IIA i.e. S block elements. The group which mostly provide non-metal is VII A i.e. halogens. The Metals give up their ONLY Valance shell electron which is accepted by the Non-metal. This results in formation of ions, The Metals gets the positive charge thus called cation and The non-metal gets a negative charge thus called anion. These Positive and Negative ion attract each other resulting in the formation of IONIC BOND.
The Ionic bond is formed between The metal and non metal because, the metals have low ionization energy due to which the valence shell is ejected out easily, and The Non-Metals have high electron affinity which means that they attract an electron with greater force because they need one electron to complete their octet.
_____________________________________Question:Question has given two atoms Potassium and chlorine. Potassium(Group 1) is metal, Chlorine(Group 7) is non metal. As you can se that there is only one electron in the outer shell of Potassium "K" and Chlorine need only one electron to complete its outer shell so Potassium will give its electron to Chlorine. Due to this reason K will become positive and Cl will become negative and they will both attract eachother forming ionic bond.
So the answer is Option C: Electron will be transferred from the potassium to the chlorine atom.
_____________________________________Best Regards,'Borz'if the atomic mass is 14 and the atomic number is 7,how many neutrons do you have?
Answer: 7 neutrons
Explanation: Atomic number refers to the number of protons in the nucleus of the atom. Also you can treat atomic mass as how many particles (protons and neutrons) are in the nucleus of the atom. So for this problem:
14 particles - 7 protons = 7 neutrons (and we know all that's left over is neutrons because we subtracted all the protons)
What is the difference between carbon-12, carbon-13, and carbon-14?
Answer:
Number of neutrons in the nucleus.
Explanation:
Mass number is protons plus neutrons. Protons do not change from isotope to isotope
I WILL GIVE YOU BRAINLIEST HELP HELP HELP THE SUBJECT IS ACTUALLY SCIENCE What factor is deer in an ecosystem? Abiotic or Biotic? the subject is actually science
Answer: the answer is biotic because dear are a living factor
Explanation:
PLEASE HELP!!! I'LL MARK YOU BRAINIEST!!!
Answer:
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How is the pH of an acidic substance raised?
1) Dilute it.
2) freeze it.
3) Stir it.
4) Concentrate it.
Answer: 4) Concentrate it
Explanation:
What is the total number of atoms in 0.20 mol of propanone, CH3COCH3?
NA = 6.022 x 1023
1.2 x 1022
1.2 x 1023
6.0 X 1024
6.0 x 1023
Answer:
1.2×10²³ atoms.
Explanation:
Data obtained from the question include:
Mole of propanone = 0.20 mole
Number of atoms of propanone =.?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.022×10²³ atoms.
This implies that 1 mole of propanone also contains 6.022×10²³ atoms.
Thus, we can obtain the number of atoms in 0.20 mole of propanone as illustrated below:
1 mole of propanone contains 6.022×10²³ atoms.
Therefore, 0.20 mole of propanone will contain = 0.2 × 6.022×10²³ = 1.2×10²³ atoms.
Thus, 0.20 mole of propanone contain
1.2×10²³ atoms.
The total number of atoms in 0.20 mole of propanone is 1.2×10²³, i.e. in given mole 1.2×10²³ atoms of propanone is present.
How many atoms present in one mole?In one mole of any substance 6.022 × 10²³ atoms of that substance will present, and this number is known by the name of Avogadro's number.
We have given moles of propanone = 0.20 mole
No. of atoms present in 0.20 mole of propanone = 0.20 × 6.022×10²³ = 1.2×10²³.
Hence, 1.2×10²³ atoms are present in given moles.
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The rate of a chemical reaction would be decreased by
Answer:
The tempreature???
Explanation:
Colder tempreatures lead to a slower chemical reaction and warmer tempreatures lead to a faster chemical reaction.
Why are ocean currents important to coastal regions?
Answer:
Warm and cold ocean currents can affect the climate of an area along the coast if the winds blow in from the ocean. Warm ocean currents heat the air above the water and carry the warm air to the land, increasing the temperature of the coastal region.
Explanation:
Ocean currents are important to coastal regions for a number of reasons.
What are the importance?Distribute heat. Ocean currents distribute heat around the globe, which helps to moderate the climate in coastal regions. For example, the Gulf Stream brings warm water from the Gulf of Mexico to the coasts of Europe, which helps to keep Europe's climate warmer than it would be otherwise.
Transport nutrients. Ocean currents transport nutrients from the ocean's depths to the surface, which supports marine life. For example, the California Current brings nutrients from the deep ocean to the surface, which supports a rich marine ecosystem off the coast of California.
Diversify marine life. Ocean currents help to diversify marine life by transporting different species to different parts of the ocean. For example, the Kuroshio Current brings warm water from the western Pacific Ocean to the eastern Pacific Ocean, which has helped to diversify the marine life in this region.
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1. Why is soil erosion relatively less in dense forests as compared to barren, open fields?
Because the deep roots of big trees hold the soil and don't let it slip away simply by rain or wind.
Answer:
the roots of the trees keep the soil in place opposed to a barren landscape that has little to no plants to keep the soil in place
hope this helps (╹ڡ╹ )
Knowledge of the functioning of cells and DNA has led to the creation of new life in laboratories. What is an example of an ethical question this raises?
a) Why are cells and DNA important to study?
b) How do cells create new life?
c) How many cells do humans have?
Is it wrong to change or control life forms?
Answer:
Explanation:
It’s D
Answer:
D. Is it wrong to change or control life forms?
Explanation:
edge 2021 :P
When a 0.4500 g sample of impure potassium chloride was dissolved in water and treated with an excess ofsilver nitrate, 0.8402 g of silver chloride was precipitated. Calculate the percentage KCl in the original sample.
Answer:
97.78% KCl in the original sample
Explanation:
The % of KCl in the original sample would be as follows:
[tex]97.78[/tex]%
Given that,
Amount of sample of impure Potassium Chloride [tex]= 0.4500 g[/tex]
Amount of Silver Nitrate precipitated [tex]= 0.8402g[/tex]
Now,
Molarity of KCl = [tex]74.5 g/mol[/tex]
Minimum moles required for reaction [tex]= 0.0059 mol[/tex]
Final number of moles [tex]= 0.0059 mol[/tex]
So,
Concentration = Number of moles * Molarity
[tex]= 0.0059 mol * 0.74.5 g/mol\\= 0.440g[/tex]
Therefore,
% of KCl in the original Sample = Weight of Pure KCl/Weight of Impure KCl
[tex]= 0.440/0.450[/tex] × [tex]100[/tex]
[tex]= 97.78[/tex]%
Thus, [tex]97.78[/tex]% is the correct answer.
Learn more about "Potassium Chloride" here:
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What color are the stars on the diagram with the lowest surface temperatures?
Answer:
red supergiants is the answer