Answer:
coal
Explanation:
fossil fuels are formed by natural process.
Coal is the fossil fuel. A is correct.
Fossil fuels are non renewable source of energy that means once they get finished we will not be able to use them. Hence it is very important for us to find an alternate like a renewable source of energy like sunlight so that we will not have to depend on these fossil fuels and will not have to tolerate the pollution happening by them as well.
Given options are-
A. Coal
B. Biomass
C. Geothermal
D. Nuclear
Therefore, Coal is the fossil fuel. A is correct.
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Map
Formulate your hypothesis.
List down the materials.
• Write the methods.
Answer:
How to Formulate an Effective Research Hypothesis
State the problem that you are trying to solve. Make sure that the hypothesis clearly defines the topic and the focus of the experiment.
Try to write the hypothesis as an if-then statement. ...
Define the variables.
Explanation:
What is the volume of a bubble if the original was .25 m^3 at 4 atm and the pressure was reduced to 1 atm?
Answer:
1.00 m^3
Explanation:
Boyles law says that PV = constant, or P1V1=P2V2, while temperature remains constant.
0.25 m^3 *4 atm = V* 1 atm
V = 0.25 m^3 / (1/4)
= 1 m^3
a. how many grams of H2SO4 are in 3.5 liters of 2.0 M H2SO4
b. how many liters of 2.0 M H2SO4 would be made from 3 liters of water. (Hint water has a density of 1g per mL.)
Answer:
a. 686g of H2SO4 are present.
b. 3.321L would be made
Explanation:
a. Molarity, M, is an unit of concentration defined as the ratio between moles of solute (In this case H2SO4) and liters of solution. The moles of H2SO4 in 3.5L of 2.0M H2SO4 are:
3.5L * (2.0mol H2SO4 / L) = 7.0 moles H2SO4
The mass is obtained using molar mass of H2SO4 -98g/mol-:
7.0 moles H2SO4 * (98g / mol) = 686g of H2SO4 are present
b. The density of H2SO4 is 1.83g/mL. The volume of 2.0M H2SO4 per liter of solution is:
2.0mol H2SO4 / L * (98g / mol) * (1mL / 1.83g) = 107mL of H2SO4 are present per liter of solution. In 3L there are:
3L (107mL / L) = 321mL = 0.321L of H2SO4 must be added to 3L of water to produce 2.0M H2SO4. The total volume is:
3L + 0.321L = 3.321L would be made
Which piece of glassware shown below is used to hold and dispense a solution of known concentration during a titration?
Answer:
Answer C
Explanation:
Got it off of q**zlet ;)
Answer
Its C confirmed
Explanation:
Just did the test
using a map give the coordinates of the capital of the neighboring countries of the philippines e.g tokyo japan
Answer:
The correct answer is -
1. Malaysia - Kuala Lumpur 3.1390° N, 101.6869° E
2. Indonesia - Jakarta - 6.2088° S, 106.8456° E
3. Vietnam - Hanoi - 21.0278° N, 105.8342° E
4. Taiwan - Taipei -25.0330° N, 121.5654° E
5. China - Beijing - 39.9042° N, 116.4074° E
6. Palau - Ngerulmud - 7.5004° N, 134.6243° E
7. Japan - Tokyo - 35.6762° N, 139.6503° E
Explanation:
The Philippines does not share its land borders with any country, however, the Philippines claims that they share their boundary with Malaysia. Other than land borders they also share maritime borders with Palau, Taiwan, Vietnam, China, Indonesia, and Japan.
All these neighboring countries have capitals that are as follows with their coordinates on the atlas-
1. Malaysia - Kuala Lumpur 3.1390° N, 101.6869° E
2. Indonesia - Jakarta - 6.2088° S, 106.8456° E
3. Vietnam - Hanoi - 21.0278° N, 105.8342° E
4. Taiwan - Taipei -25.0330° N, 121.5654° E
5. China - Beijing - 39.9042° N, 116.4074° E
6. Palau - Ngerulmud - 7.5004° N, 134.6243° E
7. Japan - Tokyo - 35.6762° N, 139.6503° E
Question 2
4 pts
Inside a car that was at STP, a 0.95 L bottle warms up to 144 C. If the volume of the bottle
remains constant, what is the pressure, in atm, inside the hot water bottle?
Answer:
1.53 atm
Explanation:
From the question given above, the following data were obtained:
Volume = constant
Initial pressure (P₁) = stp = 1 atm
Initial temperature (T₁) = 273 K
Final temperature (T₂) = 144 °C = 144 °C + 273 = 417 K
Final pressure (P₂) =?
Since the volume is constant, the final pressure can be obtained as follow:
P₁ / T₁ = P₂ / T₂
1 / 273 = P₂ / 417
Cross multiply
273 × P₂ = 417
Divide both side by 273
P₂ = 417 / 273
P₂ = 1.53 atm
Therefore, the final pressure (i.e the pressure inside the hot water bottle) is 1.53 atm.
The volume of a gas is decreased from 100 liters at 173.0°C to 50 liters at a constant pressure. After the decrease in volume, what is the new temperature of the gas?
Answer:
223.08 K
Explanation:
First we convert 173.0 °C to K:
173.0 °C + 273.16 = 446.16 KWith the absolute temperature we can use Charles' law to solve this problem:
T₁V₂=T₂V₁Where in this case:
T₁ = 446.16 KV₂ = 50 LT₂ = ?V₁ = 100 LWe input the data:
446.16 K * 50 L = T₂ * 100 LAnd solve for T₂:
T₂ = 223.08 KBrainiest and 10 Points
What is the name of the rays the human eye can see?
A. Radio Rays
B. Water Waves
C. Visible Light Rays
D. X Rays
I believe the answer for this is:
C. Visible Light Rays
I hope this helps! :D
Answer:
C, visible light rays :)
Explanation:
Hope i could help
pcl3 give me brief explanation donot obey octet rule? I will give him brainlist?
Answer:
Explanation:
PCl3, the octet for both phosphorus and Chlorine atoms is complete. Therefore, it follows the octet rule.
The maximum amount of water vapor that air can hold is ? , while the actual amount of water vapor in the air is ? and is measured as a ?.
Answer:
The maximum amount of water vapor the air can hold at a given temperature is known as the Saturation Point, it is also identified as 100% relative humidity.
BRAINIEST AND POINTS
Which option below accurately describes the relationship between wavelength and energy level?
A. Longer wavelength means higher energy level.
B. Shorter wavelength means higher energy level.
Answer:
shorter waves equal more power
Explanation:
"higher frequency and shorter wavelengths are one in the same thing. the higher frequency - higher energy results from Planck's realization of the quantization of light and resulting E=hf equation"
pcl3 compound stable but don't follows octet rule what is the reason behind?
When aqueous solutions of potassium nitrite and nitric acid are mixed, an aqueous solution of potassium nitrate and nitrous acid results. Write the net ionic equation for the reaction.
Nitric acid and potassium nitrite reacted together potassium nitrate and nitrous acid forms. The net ionic equation for the reaction is given below:
[tex]\rm K^{+} (aq)+ NO_{3} ^{-} (aq)\rightarrow KNO_{3}(s)[/tex]
What is ionic equation?A balanced reaction represents all the reactants and products in perfect stoichiometry. Thus, each element have to be equal in number on both side.
A balanced ionic equation represents all the ions participating in a reaction and with their charges balanced on both side and state of the reaction is given in brackets. Net ionic equation represents the formation of a solid precipitate.
The complete ionic equation of reaction of one mole of potassium nitrite with one mole of nitric acid is given below:
[tex]\rm K^{+} + NO_{2}^{-}(aq) + H^{+} (aq) +NO_{3}^{-}(aq) \rightarrow H^{+} (aq) + NO_{2}^{-}(aq) + KNO_{3} (s)[/tex]
Cancelling the aqueous ions from both sides we get the net ionic equation representing the formation of solid potassium nitrate as shown here:
[tex]\rm K^{+} (aq)+ NO_{3} ^{-} (aq)\rightarrow KNO_{3}(s)[/tex]
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PLS HELP
When 50.0 g of copper was reacted with 300.0 g of silver nitrate solution, 149 g of silver was obtained. What is the percent yield of silver obtained?
Answer:
Percent yield of silver obtained = 78.18% (Approx.)
Explanation:
Given:
Amount of copper = 50 gram
Amount of silver nitrate = 300 gram
Amount of silver = 149 gram
Find:
Percent yield of silver obtained
Computation:
Percentage of Silver in silver nitrate = 108[100/(108+14+48)]
Percentage of Silver in silver nitrate = 108/[100/170]
Percentage of Silver in silver nitrate = 63.53% (Approx.)
Amount of Silver produced = [63.53%][300]
Amount of Silver produced = 190.59 gram
Percent yield of silver obtained = [Amount of silver / Amount of silver produced]100
Percent yield of silver obtained = [149/190.59]100
Percent yield of silver obtained = 78.18% (Approx.)
You start with 0.1 L of a 5.00 M solution, and you plan to dilute it to make a
solution with a concentration of 0.625 M. How much water did you add to
the container?
a) 800ML
b) 100ml
c)700ml
d)750ml
which element is found in period 6 group 14
Answer:
Lead
that can be found in the periodic table of elements
Explanation:
A more electronegative atom A) will have more attraction to the electrons in a chemical bond. B) is more likely to lose an electron. C) is less likely to form a chemical bond. D) is more likely to form an ionic bond with another highly electronegative atom.
Answer: A more electronegative atom will have more attraction to the electrons in a chemical bond.
Explanation:
An atom that is able to attract electrons or shared pair of electrons more towards itself is called an electronegative atom.
For example, fluorine is the most electronegative atom.
Due to its high electronegativity it is able to attract an electropositive atom like H towards itself. As a result, both fluorine and hydrogen will acquire stability by sharing of electrons.
Thus, we can conclude that a more electronegative atom will have more attraction to the electrons in a chemical bond.
Analyses of enzymes found in the blood are used as indicators that tissue damage (heart, liver, muscle) has occurred and resulted in the leakage of cellular enzymes into the bloodstream.
a. True
b. False
Answer:
True.
Explanation:
Yes, analyses of enzymes found in the blood are used as indicators of tissue damage in the heart, liver, muscle etc has occurred. This leakage of enzymes into the bloodstream tells us whether the tissue is damaged or not. Lactate dehydrogenase is a type of enzyme which is used as indicator which is responsible for the interconverts lactate and pyruvate. The concentration of this enzyme in the blood tells us about tissue damage.
Answer:
a. True
Explanation:
The co enzyme used for this reaction is NADH+, here H+ acts as co substrate.
This is required to find the tissue damage that has occurred in our body which resulted in leakage of cellular enzymes into the bloodstream.
This coenzyme is used for conversion of lactose dehydrogenase.
How many moles are in 3.01 x 10^23 atoms of zinc?
Answer:
0.5 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.01}{6.02} \\ = 0.5[/tex]
We have the final answer as
0.5 molesHope this helps you
If the molecule has n-C2 axes perpendicular to its Cn axis, choose True. Otherwise, choose False. Be sure to build a model or draw the structure before selecting your answer. If needed, search for the molecular structure online or in a textbook.XeF4[PdCl4]2−naphthalenefuran, C4H4O
Answer:
XeF4 True
[PdCl4]2− True
naphthalene True
Furan False
C4H4O False
Explanation:
From the given information:
Only XeF4; [PdCl4]2−; naphthalene are true. This is because their molecules contain -nC₂ axis which is perpendicular to the Cn axis. The image attached below shows the structural formula of each compound, there below, we can see that Furan only possesses one C₂ axis but not -nC₂ ⊥ C₂.
How many moles of H20 are produced from 3 moles of oxygen?
2 H2+O2 -> 2 H2O
Answer:
6 moles
Explanation:
because if conducting a moles ratio for oxygen and water it is 1:2 so the moles would calculate up to 6 moles after cross multiplication.
Predict the effect of an eightfold pressure increase on the equilibriunm composition of the reaction 3 Nalg) + H21g) =2 NaHlg)
According to Le cha telier's principle when we increase the pressure of a equilibrium reaction the reaction shift to the side where few moles of gas present.
Your reaction (Notice - I guess the reaction you written is wrong, but still I'm solving with your given prediction)
3NaI (g) + H2 (g) = 2NaHI (g)
Where access of sodium iodide is reacting with Hydrogen gas to form NaHI molecule.
Number of moles of gas on reaction side - 3+2 = 5 moles
Number of moles of gas on product side - 2 moles
Conclusion- the reaction will shift to the right of the reaction
According to Le cha telier's principle when we increase the pressure of a equilibrium reaction the reaction shift to the side where few moles of gas present.
Your reaction (Notice - I guess the reaction you written is wrong, but still I'm solving with your given prediction)
3NaI (g) + H2 (g) = 2NaHI (g)
Where access of sodium iodide is reacting with Hydrogen gas to form NaHI molecule.
Number of moles of gas on reaction side - 3+2 = 5 moles
Number of moles of gas on product side - 2 moles
Conclusion- the reaction will shift to the right of the reaction
How many grams of P2O3 are needed to react with 248 g of NaOH ?
Answer:
170.43g P2O3
Explanation:
First write and balance the equation:
P2O3 + 4NaOH → 2Na2HPO3 + H2O
NaOH=39.997 g/mol P2O3= 109.945 g/mol
248g NaOH x 1 mol NaOH/39.997g NaOH x 1 mol P2O3/4 mol NaOH x
109.945g P2O3/ 1 mol P2O3 = 170.43g P2O3
80. When water forms ice, hydrogen bonds around a water molecules are at ... apart.
1.
30 °C
2. 45 °C
3.
90 °C
4.
180 °C
5. 35 °C
6. I do not know.
N
Answer:
6
Explanation:i dont know
A metal cube with a specific heat capacity of .55
J/gºC, a mass of 55grams and a temperature of 85°C
is immersed in water at 20°C. The metal and water
then reach a equilibrium temperature of 23°C. What is
the mass of the water?
Answer:
148.85 g or 0.14885 kg
Explanation:
Applying,
Heat lost by the metal cube = heat gained by the water.
c'm'(t₁-t₃) = cm(t₃-t₂).................. Equation 1
Where c' = specific heat capacity of the metal, m' = mass of the metal, c = specific heat capacity of water, m = mass of water, t₁ = Initial temperature of the metal, t₂ = Initial temperature of water, t₃ = equilibrium temperature.
make m the subject of the equation
m = c'm'(t₁-t₃)/c(t₃-t₂).............. Equation 2
From the questions,
Given: c' = 0.55 J/g.°C, m' = 55 g, t₁ = 85°C, t₂ = 20°C, t₃ = 23°C
Constant: c = 4.2 J/g.°C
Substitute these values into equation 2
m = 0.55×55×(85-23)/(4.2×[23-20])
m = 1875.5/12.6
m = 148.85 g.
m = 0.14885 kg
When Rutherford performed his experiment, only 1 in 20,000 alpha particles bounced straight back or were
deflected greatly. The rest went straight through the gold foil.
a What does this indicate about the probability of actually hitting anything?
Answer:
when rutherford performed his experiment, only 1 in 20,000 alpha particles bounced straight back or were deflected greatly. the rest went straight through the gold foil. e) based on this evidence, what is in atom's center? positively charged particles.
Explanation:
determines the type of element an atom is.
The number of neutrons
The number of atoms
The number of electrons
The number of protons
Answer:
for number of neutrons it is mass number take away the atomic number
number of electron is the same as number of proton unless there is a charge like +2 it will have 2 less electron than the proton (atomic number ) number.
number of proton is the atomic number
Explanation:
hope it make sense:)
Answer:
D. The number or protons
Explanation:
It doesn't matter how many electrons or neutrons an atom has; the element always is defined by its number of protons.
The student kicks the soccer ball three times and I shouldn’t record the distance the amount of time the ball travels and the average speed in the table shown below soccer ball girl how many seconds did it take for the ball to travel 30 m during kick three
Answer: D it’s is 2.0 s
i think..
Explanation:
Name the substance which occurs in all the physical states in nature?
Answer: water
For many centuries, it was considered that there were only three states of matter: solid, liquid and gas (the three that are present and stable in our world). And water is the substance that best represents them, because it is the only one that exists naturally in the three states.
Explanation: Matter can exist in one of three main states: solid, liquid, or gas.
Solid matter is composed of tightly packed particles. ...
Liquid matter is made of more loosely packed particles. ...
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.
Answer:
Water is the only common substance that is naturally found as a solid, liquid or gas. Solids, liquids and gases are known as states of matter.
Feel free to mark it as brainliest :D
Ignore this part unless you want to understand out of your syllabus:
However, if you take into account the fifth state of matter, Bose-Einstein Condensate, which has been recently discovered, there is no substance as such.
What happens when 10g of nitrogen combines with 10 grams of hydrogen
It would create 12.1 g of ammonia (NH3).
The amount of hydrogen that is reacted in this reaction is:
(10 g N2)[tex](\frac{3.0gH2}{14.0gN2}) =[/tex] 2 g H2
According to the Law of Conservation of Mass, the mass of ammonia produced is the combination of hydrogen and nitrogen reacted or:
2.1g + 10.0g = 12.1 g of NH3