Answer: 16700 Joules
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
[tex]Q=m\times c\times \Delta T[/tex]
Q = Heat absorbed = ?
m = mass of sand = 2 kg
c = heat capacity = [tex]835J/kg^0C[/tex]
Initial temperature = [tex]T_i[/tex] = [tex]40^0C[/tex]
Final temperature= [tex]T_f[/tex] = [tex]50^0C[/tex]
Change in temperature ,[tex]\Delta T=T_f-T_i=(50-40)^0C=10^0C[/tex]
Putting in the values, we get:
[tex]Q=2kg\times 835J/kg^0C\times 10^0C[/tex]
[tex]Q=16700J[/tex]
16700 J of energy must be added to a 2-kilogram pile of it to increase its temperature from 40°C to 50°C
help asap plzzz! Which of the following diagrams is the correct electron dot diagram for S?
Answer:
A.
Explanation:
Sulfur has 6 valence electrons, therefore has 6 dots.
- Hope that helps! Please let me know if you need further explanation.
The correct option is A.
What is a dot diagram?
A Lewis electron dot diagram (or electron dot diagram, or a Lewis diagram, or a Lewis structure) is a representation of the valence electrons of an atom that uses dots around the symbol of the element. The number of dots equals the number of valence electrons in the atom.
Why do we use electron dot diagrams?These diagrams are helpful because they allow us to show how atoms are connected, and when coupled with Valence Shell Electron Repulsion Theory (VSEPR), we can use Lewis structures to predict the shape of the molecule.
Learn more about dot diagrams here brainly.com/question/856013
#SPJ2
Why do we use nuclear energy from power plants?
Answer:
Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.
Explanation:
Enjoy!
Select the correct answer.
Which action reflects irresponsible lab safety behavior?
A.
not wearing goggles when breaking a rock with a hammer
B.
not shaking hands with your lab partner after a successful experiment
C.
not chatting with others while mixing two reactive chemicals
D.
not sharing findings and recordings with the general public
E.
not using scientific tools while making crucial observations
Answer:
A. not wearing goggles when breaking a rock with a hammer
Explanation:
You could get extremely hurt if you are not wearing goggles while doing lab work.
The action that reflects irresponsible lab safety behavior is not wearing goggles when breaking a rock with a hammer. Thus, the correct option for this question is A.
What are Lab safety behaviors?Lab safety behaviors may be defined as those actions and habits that are persistently taken by individuals in order to maintain discipline and safety on their own. Some of the lab safety behaviors are as follows:
Avoid skin and eye contact with all chemicals by wearing gloves and goggles.Follow an accurate protocol during an experiment. Beware of all safety showers, eye washers, and fire extinguishers. Avoid eating, drinking, and unnecessary talking in the lab.Never smell or inhale laboratory chemicals.Some of the lab safety behaviors also include not shaking hands with your lab partner after a successful experiment, not sharing findings and recordings with the general public, etc. This is because these are some private sources of information.
Therefore, the action that reflects irresponsible lab safety behavior is not wearing goggles when breaking a rock with a hammer. Thus, the correct option for this question is A.
To learn more about Lab safety behaviors, refer to the link:
https://brainly.com/question/8430576
#SPJ2
Which of the following is NOT a way carbon dioxide returns to the atmosphere?
decay of organisms
emissions by factories
photosynthesis
cellular respiration
Answer:
emissions by factories is the answer
Explanation:
Factories produce air pollution which is polluted air, the other options
decay of organisms, photosynthesis (convert light energy into chemical energy - and returns CO2), and cellular respiration are all of the ways carbon dioxide returns to the atmosphere.
Hope this helped! Have a nice day, be safe and healthy :)
Help me!
what is the biggest disadvantage of using nuclear power to produce electricity?
a. nuclear fission releases more air pollution than burning coal
b. nuclear fission produces less energy than burning coal or oil.
c. nuclear waste must be safely stored for many years
d. nuclear waste must be incinerated
The biggest disadvantage of using nuclear power to produce electricity is the nuclear waste must be safely stored for many years.
What is nuclear power?Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from:
Nuclear fission Nuclear decay and Nuclear fusion reactionsNuclear reactions produces high amount of energy and many waste materials which are non degradable and will stay in the environment for the long time.
Hence, nuclear waste must be safely stored for many years.
To know more about nuclear power, visit the below link:
https://brainly.com/question/11963586
#SPJ2
Can somebody please help i have to turn my computer in like 30 minutes
Answer:
i studied each and they are all right except: the last one
so: D
hope i helped
-lvr
If 5.4 g of NaNO3 is dissolved in 350 mL of water, what is the molarity of the solution?
Answer:
0.18 Moles
Explanation:
first you need to convert the 5.4g to moles using molar mass
[tex](\frac{5.4g}{1})(\frac{1mol}{84.99g} )=\frac{5.4g}{84.99g} =0.0635mol NaNO_{3}[/tex])
once you have that done you can use the molarity equation to get the answer
[tex]M=\frac{0.0635mol}{0.350ml} =0.181428[/tex]
now you need to round to the correct sig fig which will give you the correct answer of 0.18moles
Blast furnaces extra pure iron from the Iron(IIl)oxide in iron ore in a two step sequence. In the first step, carbon and oxygen react to form carbon monoxide:
2C(s)+O2(g) arrow 2CO(g)
In the second step, iron(lll) oxide and carbon monoxide react to form Iron and carbon dioxide:
Fe203(s) + 3CO(g) arrow 2Fe(s)+ 3CO2(g)
Suppose the yield of the first step is 71.% and the yield of the second step is 72.%. Calculate the mass of oxygen required to make 7.0 kg of iron.
Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.
Answer:
5.9 kg
Explanation:
We must work backwards from the second step to work out the mass of oxygen.
1. Second step
Mᵣ: 55.84
Fe₂O₃ + 3CO ⟶ 2Fe + 3CO₂
m/kg: 7.0
(a) Moles of Fe
[tex]\text{Moles of FeO} = \text{7000 g Fe} \times \dfrac{\text{1 mol Fe}}{\text{55.84 g Fe}} = \text{125 mol Fe}[/tex]
(b) Moles of CO
[tex]\text{Moles of CO} = \text{125 mol Fe} \times \dfrac{\text{3 mol CO}}{\text{2 mol Fe}} = \text{188 mol CO}[/tex]
However, this is the theoretical yield.
The actual yield is 72. %.
We need more CO and Fe₂O₃ to get the theoretical yield of Fe.
(c) Percent yield
[tex]\begin{array}{rcl}\text{Percent yield} &=& \dfrac{\text{ actual yield}}{\text{ theoretical yield}} \times 100 \, \%\\\\ 72. \, \% & = & \dfrac{\text{188 mol}}{\text{actual yield}} \times 100 \,\%\\\\0.72 &= &\dfrac{\text{188 mol}}{\text{actual yield}}\\\\\text{Actual yield} & = & \dfrac{\text{188 mol}}{0.72}\\& = & \textbf{261 mol}\\\\\end{array}[/tex]
We must use 261 mol of CO to get 7.0 kg of Fe.
2. First step
Mᵣ: 32.00
2C + O₂ ⟶ 2CO
n/mol: 261
(a) Moles of O₂
[tex]\text{Moles of O}_{2} = \text{261 mol CO} \times \dfrac{\text{1 mol O}_{2}}{\text{2 mol CO}} = \text{131 mol O}_{2}[/tex]
(b) Mass of O₂
[tex]\text{Mass of O}_{2}= \text{131 mol O }_{2} \times \dfrac{\text{32.00 g O}_{2}}{\text{1 mol O}_{2}} = \text{4180 g O}_{2}[/tex]
However, this is the theoretical yield.
The actual yield is 71. %.
We need more C and O₂ to get the theoretical yield of CO.
(c) Percent yield
[tex]\begin{array}{rcl}71. \, \% & = & \dfrac{\text{188 mol}}{\text{actual yield}} \times 100 \,\%\\\\0.71 &= &\dfrac{\text{4180 g}}{\text{actual yield}}\\\\\text{Actual yield} & = & \dfrac{\text{4180 g}}{0.71}\\\\& = & \text{5900 g}\\& = & \textbf{5.9 kg}\\\end{array}[/tex]
We need 5.9 kg of O₂ to produce 7.0 kg of Fe.
Calcium reacts with a polyatomic ion to form a compound with the general formula Ca(X). What would be the most likely formula for the compound formed between potassium and the polyatomic ion X?
A) K X
B) K2X
C) KX2
D) K2X3
E) K3X2
Answer:
B) K2X
Explanation:
In an uncharged compound, the total oxidation state must be zero. The oxidation state of the calcium is +2, thus we get the following formula, where x is the oxidation state of the polyatomic ion X:
[tex]x + 2 = 0 \\ x = 0 - 2 \\ x = - 2[/tex]
Also, it is known that potassium has an oxidation state of +1. Since the new compound also has a total oxidation state equal to zero, we get the following equation, where k is the number of K atoms:
[tex]k \times 1 + ( - 2) = 0 \\ k - 2 = 0 \\ k = - ( - 2) \\ k = 2[/tex]
That's how it is found that the compumd consists of 2 K+ ions and one X ion.
Water is an example of a
element j
ebhdfukfyerfkuq
Answer:
As known Water is an Example of an Element.
Identify 5 things that would happen if there is not electricity.
Answer:
Living with no electricity might not be as easy as you may think and you not realise how many items in your home rely on it to function.
Electrically managed technologies supply us with many things, such as heat, food, water, transport, energy, entertainment and communication. Electricity allows us to power the technology we use every day. If you plan on trying to live without electricity, you will no longer be able to turn on the central heating in your home, use the toilet, preserve food in your fridge/freezer or have clean running water. Despite surviving thousands of years without it before, we have come to depend on it to complete our everyday tasks and have built our lives around it.The Internet goes down.A plastic bag has a volume of 22.3 L at a pressure of 99.5 kPa. If you climb a mountain and the bag expands to a volume of 22.9 L, what is the air pressure at the top of the mountain?
Answer: The air pressure at the top of the mountain is 96.9 kPa
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.
[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.
We are given:
[tex]P_1=99.5kPa\\V_1=22.3L\\P_2=?\\V_2=22.9L[/tex]
Putting values in above equation, we get:
[tex]99.5\times 22.3L=P_2\times 22.9L\\\\P_2=96.9kPa[/tex]
Thus the air pressure at the top of the mountain is 96.9 kPa
What are sports examples that involve transfer of momentum
Answer:
In sports some , examples are using a heavier bat or racket and increasing running speed or hand speed.
Explanation:
MOMENTUM: is the mass and the velocity, you can increase momentum by increase either of these elements
True or False: The dots are placed as
far apart as possible because they
represent electrons, with the same
negative charge, that repel each
Answer: True
Explanation:
According to Reference Table Adv-8, which of the following is the strongest Brönsted-Lowry acid?
1.HS-
2.H2S
3.HNO2
4.HNO3
Answer:
HNO3
Explanation:
The ability of an acid to act as a Brownstead-Lowry acid depends on it's proton donation ability.
A Brownstead-Lowry acid is a specie that donates hydrogen ions in solution.
Considering all the chemical species listed among the options, HNO3 has the greatest hydrogen donation ability. It then follows that HNO3 is the strongest Brownstead-Lowry acid among the species listed.
How many grams of NaCl are needed to prepare 1.20 liters of a 2.00 M solution?
Answer:
140 grams NaCl is needed
Explanation:
i used this How many grams of NaCl in 50 mL of 0.75 M NaCl solution? The MOLARITY of a solution is determined by the ratio of moles of solute, (the material being dissolved), compared to the liters of solution. the equation is M = mol L For this NaCl solution we have a Molarity of 0.75 in 50 mL of solution. Then i multiplied it by the correct amount
There to be more gas dissolved in a cold Diet Coke than warm Diet Coke
Answer:
Warm diet coke
Explanation:
Answer:
warm coke.
Explanation:
Gas dissolves better "or more of the gas dissolves" in a warm liquid because there is more room for it in between the particles when there is more heat.
Will someone actually help me and not just something random
Answer:
D
Explanation:
Help with as many as possible is appreciated! :)
Calculate the molarity of the solutions described below.
a. 10.0 g of sodium chloride is dissolved in 2.0 L of solution.
b. 52.5 g of sugar (C12H22O11) s dissolved in 1.0 L of solution.
c. 120 g of aluminum sulfate is dissolved in 10.0 L of solution.
d. 1.75 g of caffeine (C8H10N4O2) is dissolved in 0.100 L of solution.
Answer:
a. 0.0855 M
b. 0.153 M
c. 0.0351 M
d. 0.0901 M
Explanation:
a.
Molar mass NaCL= 23.0 +35.5 = 58.5 g/mol
10.0 g* 1 mol/58.5 g = 10.0/58.5 mol
(10.0/58.5) mol/2L = 0.0855 mol/L = 0.0855 M
b.
Molar mass (C12H22O11) =342.3 g/mol
52.5 g*1mol/342.3 g = 52.5/342.3 mol=0.153 mol
0.153 mol/1L = 0.153 M
c.
Molar mass (Al2(SO4)3) =342.2 g/mol
120g* 1 mol/342.2 g =0.351 mol
0.351 mol/10.0L = 0.0351 mol/L = 0.0351 M
d.
Molar mass (C8H10N4O2) = 194.2 g/mol
1.75 g*1mol/194.2 g = 0.00901 mol
0.00901 mol/0.100 L =0.0901 M
What is the hydronium concentration of a solution of ph 4.19M
Answer:
.000064565
Explanation:
H3O+=10^-pH
- Hope that helps! Please let me know if you need further explanation.
What reactants would you use to produce Mg(No3)2 and H2
Explanation:
This is a single replacement reaction, so we just have to switch Mg and H₂. When we do so, we get HNO₃ and Mg as our reactants. Hope this helps!
How many grams of ammonia (NH3) are present in 5.0L of a 0.050M Solution?
A. 5.2g
B. 4.3g
C. 4.3mol
D. 78g
Answer:
B
Explanation:
NH3 in a liter is 17 x 0.05 = 0.85g
In 5L = 0.85 x 5 = 4.25 = 4.3g
Answer:
B. 4.3 g
Explanation:
m = 5.0L x 0.050 mol/L x 17.031 g/mol = 4.26g ~ 4.3g
....
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
The amplitude of a wave is the vertical distance from the midpoint to either the crest or the
trough of the wave
True
False
An atom of which element has the largest atomic radius?
A)
B
B)
Be
C)
N
D)
Ne
Answer:
B) Be
Explanation:
Across the period (going from left to right of the periodic table), the atomic radius decreases. Beryllium is located further on the left of the periodic table compared to the other elements in the option and thus it has the largest atomic radius.
Explanation of trend:
Across the period, the number of protons and electrons increases in the atom. Electrons are added to the valence shell, hence the electrons added are not able to shield the increased nuclear charge well. (Since shielding effect is most effective when core electrons shield the valence electrons) Therefore, the effective nuclear charge (ENC) increases. As ENC increases, valence electrons are increasingly attracted to the nucleus. They are drawn closer to the nucleus, and so the atomic radius decreases across the period.
What is ENC?
ENC is the net nuclear charge acting on the valence electron (since the valence electron experiences electrostatic forces of attraction by the positively charged protons in the nucleus, and an electron-electron repulsion force by the core electrons)
➣ ENC
= nuclear charge (atomic no.) - shielding constant (no. of core electrons)
See diagram: black arrow represents the shielding effect (also known as electron-electron repulsion), while the orange arrows represent the nuclear charge (electrostatic forces of attraction)
List three facts or accomplishments of Modern India (India today)
Answer:
India is one of the oldest countries in the world and is found in the Asian continent of the world.
They are known as the most populous country in the world.
They also have a greater linguistic diversity than any other large country. Lots of languages are available and accepted in the country.
They are very vast in Agriculture and accounts for 40percent of Mango production in the world
Explanation:
India is the largest producer. India is also the world's largest tea and spices producer. The country manufactures many pharmaceuticals, textiles, and electric goods that are used worldwide. More people in India have access to phones than to sewage systems.
if the force between two charged particles increases,but the distance between them does not change, then:
Answer:
The attraction and repulsion gets slowly weaker
Explanation:
What is a conductor
When electrons move easily though objects
When electrons cannot move easily through objects
When electrons are at rest
PLEASE HELP :)
which type of reaction is shown in the diagram
a. fusion, because the reaction released energy?
b.fission, because the reaction absorbed energy
c.fusion, because the reaction formed lighter nuclei
d.fission,because the reaction formed heavier nuclei
Answer:
b.fission, because the reaction absorbed energy
Explanation:
The reaction is shown in the diagram is fission. because the reaction absorbed energy. Therefore, option B is correct.
What is fission ?The process of nuclear fission involves the splitting of an atom's nucleus into two or more smaller nuclei. Even by the energetic standards of radioactive decay, the fission process releases a very high quantity of energy and frequently results in gamma photons.
By dissolving large, heavy atoms, like uranium, into smaller ones, like iodine, caesium, strontium, xenon, and barium, to name just a few, fission produces energy. However, fusion involves joining light atoms, such as the deuterium and tritium isotopes of hydrogen, to create the heavier helium.
Nuclear fission is used by all nuclear power plants, and uranium atoms are typically used in nuclear power plants. A neutron splits a uranium atom when it collides with it during nuclear fission, releasing a significant quantity of energy.
Thus, option B is correct.
To learn more about fission, follow the link;
https://brainly.com/question/2732120
#SPJ2
Which of the following statements is true?
Sound vibrations are changed into electrical impulses by the eardrum.
It is dangerous to listen to sounds over 160 dBs.
High-pitched sounds have low frequencies.
All of the above.
Answer:
all of the above!! :)))
Explanation:
List three methods that scientists can
use to develop organisms with desirable traits.
Answer:
Um I don't know if this is what you're looking for but selective breeding, genetic modification, The manipulation of plasmids ,- Grafting branches
Explanation:
