why is it difficult to obtain oxygen from water
Answer:
Combined with Hydrogen
Explanation:
Calcium has two electrons in its outer level. What will it most likely do in a reaction?
try to give away its two outer electron to another atom
try to pick up 6 electrons from another atom or two
try to pick up 2 electron from another atom to fill the 4s sublevel
nothing because it is perfectly stable.
Answer:
try to give away its two outer electron to another atom
Explanation:
Jonathan is working in his basement on a science fair project when his little sister closes and locks the door. Jonathan wants to let his parents know that he is stuck down in the basement. He can either yell as loudly as he can, bang on the metal pipes, or bang on the concrete wall. Which should he do if he wants someone to hear him? Explain your answer, and explain why the other options would not be as effective.
Answer:
i think its metal pipes
Explanation:
sorry if im wrong
1) If heating 1Kg of water, how much would the temperature increase by burning 100g of each substance each substance:
a) Ethanol: ∆H= 29.65KJ/g
b) Hexane: ∆H= 48.29KJ/g
c) Kerosene(C12H26): ∆H= 46.2KJ/g
d) Car Fuel (90% octane): ∆H= 47.3KJ/g
e) Diesel (C12H23): ∆H= 44.8KJ/g
Answer:
a) The temperature of the water will rise by maximum 100 K, steam by 143.9 K
b) The temperature of the water will rise by maximum 100 K, steam by 1077.45 K
c) The temperature of the water will rise by maximum 100 K, steam by 972.75 K
d) The temperature of the water will rise by maximum 100 K, steam by 1027.86 K
e) The temperature of the water will rise by maximum 100 K, steam by 902.6 K
Explanation:
a) ΔH for ethanol = 29.65 kJ/g therefore, burning 100 g will produce;
29.65 × 100 = 2965 kJ
The specific heat capacity of water = 4.184 J/(g·K)
Therefore, 2965000= 1000 × 4.184 × ΔT
ΔT = 2965000 ÷ (1000 × 4.184) = 708.65 K
Latent heat of water = 2260 kJ/kg will be absorbed when the temperature reaches the boiling point of water hence we have
2965 - 2260 = 705 kJ to heat the water of which a maximum of 418.4 will boil the water and the steam temperature will rise by (705-418.4)/1.996 = 143.59 K
b) For Hexane: ΔH = 48.29 kJ/g
100 g will produce 4829 kJ
∴ Temperature change for the 1 kg water is given as follows
ΔT = 4829000 ÷ (1000 × 4.184) = 1154.16 K
However
4829 - 2260 = 2569
2569 - 418.4 = 2150.6
2150.6 / 1.996 = 1077.45 K
The final steam temperature will rise by 1077.45 K
c) For Kerosene(C₁₂H₂₆): ΔH = 46.2 kJ/g
100 g will produce 4620 kJ
∴ Hypothetically the temperature change for the 1 kg water is given as follows
ΔT = 4620000 ÷ (1000 × 4.184) = 1104.21 K
However
4620 - 2260 = 2360
2360 - 418.4 = 1941.6
1941.6 / 1.996 = 972.75 K
The final steam temperature will rise by 972.75 K
d) For Car Fuel(90% octane): ΔH = 47.3 kJ/g
100 g will produce 4730 kJ
∴ Temperature change for the 1 kg water is given as follows
ΔT = 4730000 ÷ 4184 = 1130.5 K
However
4730 - 2260 = 2470
2470 - 418.4 = 2051.6
2051.6 / 1.996 = 1027.86 K
The final steam temperature will rise by 1027.86 K
e) For Diesel (C₁₂H₂₃): ΔH = 44.8 kJ/g
100 g will produce 4480 kJ
∴ Temperature change for the 1 kg water is given as follows
ΔT = 4480000 ÷ 4184 = 1070.75 K.
However
4480 - 2260 = 2220
2220 - 418.4 = 1801.6
1801.6 / 1.996 = 902.6 K
The final steam temperature will rise by 902.6 K.
what is the gram formula mass for Mg(OH)2
Answer:
58.33 g/mol
Explanation:
The force between two objects each of charge +Q Is measured as +F when the objects are separated distance d apart. If the charge on each object is double determine the new force between them
a) +2F
b) +4F
c) +1/2F
d) +1/4F
Answer:
B
Explanation:
By using coulombs law meaning the amount of force between two stationary electrically charged particles
jamie is not sure a new medication will work because it has not had a large test group. Is jamie being creative?
Answer:
yes because I wouldn't do it
What is the sequence of energy transformations that occur in a nuclear reactor? nuclear energy Right arrow. Mechanical energy Right arrow. Thermal energy Right arrow. Electrical energy nuclear energy Right arrow. Thermal energy Right arrow. Mechanical energy Right arrow. Electrical energy thermal energy Right arrow. Nuclear energy Right arrow. Mechanical energy Right arrow. Electrical energy electrical energy Right arrow. Thermal energy Right arrow. Mechanical energy Right arrow. Nuclear energy
Answer:
NUCLEAR ENERGY -----> MECHANICAL ENERGY -------> THERMAL ENERGY --------> ELECTRICAL ENERGY
Explanation:
In nuclear reactor, various energy transformations occur in order to generate electricity. Nuclear reactor converts the energy released from nuclear fission and the heat generated is removed from the reactor by a cooling system where steam is generated. The steam then drives a turbine which powers a generator to produce electricity.
A nuclear reactor is hence an equipment where nuclear chain reactions occur and control can be obtained. The nuclear reactor uses mostly uranium-235 and Plutonium-239. When these radioactive substances absorbs neutrons, they undergo nuclear fission causing the nucleus to split into two or more smaller compounds with the release of kinetic energy a form of mechanical energy, gamma radiations and others.The kinetic energy is then harnessed in the equipment as heat (thermal energy) which is received by a cooling system and steam is generated. The steam can then power the generator from which electricity is obtained (electrical energy).
So therefore, in a nuclear reactor, the nuclear energy is transformed to mechanical energy and then thermal energy which powers the generation of the electrical energy.
Answer:
nuclear energy Right arrow. mechanical energy Right arrow. thermal energy Right arrow. electrical energy or (A)
Explanation:
The volume of an ideal gas is inversely proportional to the pressure
applied to the gas at a constant temperature. A gas has a volume of
239 liters at a pressure of 2.00 atmospheres (atm). What pressure is
applied to this gas if the volume is .500 liters?
Answer:
Final pressure is 0.956 atm
Explanation:
Based on Boyle's law, "The volume of an ideal gas is inversely proportional to the pressure when temperature is constant". The equation is:
P₁V₁ = P₂V₂
Where 1 represents initial state and 2 final state of the gas.
If a gas has 239L and 2.00 atm as initial state. If the final volume is 500L:
239Lₓ2.00atm = P₂500L
239Lₓ2.00atm / 500L = P₂
0.956atm = P₂
23592U + 10n → ____10n + 13956Ba + 9436Kr
Answer:
nice question dont know the answer tho
When elements chemically combine with each other, what do they form?
Answer:
Compounds
Explanation:
A compound is a substance formed when two or more elements are chemically joined. (For example Water, salt, and sugar are compounds.) When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
Which part of the calcium atom in the ground state is represented by the dots in its Lewis electron dot diagram
Answer:
On the left side of calcium atom.
Explanation:
There are two dots are present on the left side of calcium atom which represents the unpaired electrons present in the outermost shell. This structure is presented by Lewis in order to show the number of unpaired electrons in the atom. if the calcium atom loses these two electron during a chemical reaction so the two dots disappear and the calcium atom is now stable.
Answer:
the electrons in the fourth shell
Explanation:
the Lewis electron dot diagram represents the valence electrons, in the case of calcium, the V.E. are in the fourth shell
which value is expected to be the largest? heat of fusion, heat of vaporization, specific heat of a liquid, specific heat of a solid, or specific heat of a gas?
Answer:
Heat of fusion
Explanation:
110. A sports drink" contains 55 mg of potassium ions per 400 ml
serving. Calculate the concentration of the potassium ions in ppm.
Answer:
The concentration of the potassium ions in ppm is 137.5 ppm
Explanation:
Here, we are interested in calculating the concentration of the potassium ions in ppm.
Mathematically, the term ppm which is read as parts per million is = mg of solute/liter of solution
We already have the mg of solute as 55mg
all we need now is the liters of solution
But what we have is 400 ml which is read as 400 milliliters
Mathematically, 1000 ml = 1l
Thus 400 ml = 400/1000 L = 0.4 L
Now the ppm = 55mg/0.4L = 137.5 mg/L or simply 137.5 ppm
the chemical equation for reduction of phosphorite Ca3(PO4)2
Answer:
The chemical equation is;
Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO
Explanation:
Here, we are interested in writing a chemical equation that is useful in the reduction of phosphorite.
We should understand that to be able to reduce phosphorite, there is need for a reducing agent.
Solid carbon can be used here.
The products formed are shown in the equation as follows;
Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO
How would I get marker and paint off of a wood table without ruining it?
Answer:
get alcohol, and put it on a cloth then wipe it
Explanation:
the medical alcohol btw, not the one you drink lol
idk if it'll work wit paint but for sure with the marker
Answer:
For the marker, if it’s permanent then you should pour a little bit of nail polish remover ON THE STAIN and scrub it off with a paper towel.
For the paint, you can try using paint thinner, but this only works for a wood table that isn’t painted so I wojldnt reccomend that. Idk what to do with the paint tbh. But the first tip for the nail polish definitely works.
Which two factors affect the strength of
a metallic bond?
Answer: Number of protons and number of valance electrons.
Explanation:
There are three factors which determine metallic bond strength. greater the no of protons, greater will be attraction between nucleus and valance shell electrons and stronger will be metallic bond. greater no of valance electron, greater will be attractions between nucleus and electrons and stronger will be bond.
which of the following best describes what a scientist does
This might help you with your question.
This is a person who scientific researches to make more knowledge in a certain area of interest
______________ have properties of both metals and non metals.
Answer:
gold
Explanation:
20 points!! Please help me! Will mark Brainliest!! complete the following word equations:) also write the balanced equation, full ionic equation, and net ionic equation. Also include the states:)
a) zinc nitrate + calcium sulphide—>
b) potassium + calcium chloride—>
Answer:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.
The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.
a) zinc nitrate + calcium sulphide [tex]\rightarrow [/tex] zinc sulphide + calcium nitrate
balance equation : [tex]Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)[/tex]
total ionic equation :
[tex]Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)[/tex]
net ionic equation :
[tex]Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)[/tex]
b) potassium + calcium chloride [tex]\rightarrow [/tex] potassium chloride + calcium
balance equation : [tex]2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)[/tex]
total ionic equation :
[tex]2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca[/tex]
net ionic equation: [tex]2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca[/tex]
How many moles of KNO3 will be required to prepare 8.0L of 1.40 M KNO3?
Answer:
11.2 moles of KNO3 will be required to prepare 8.0 L of 1.40 M KNO3
Explanation:
To answer this question, we need an understanding of the units of the term called molarity.
1.40M KNO3 means that there are 1.4 moles per dm^3 or per liter of the solution.
Now, since there are 1.4 moles in 1 liter
x moles will be present in 8.0 liters
Thus, mathematically;
x * 1 = 8 * 1.4
x = 11.2 moles
write the full form of the following LPG and CNG
Answer:
LPG -Liquefied Petroleum Gas. CNG-Compressed Natural Gas.
May this help you
Hey!!!
LPG=Liquified Petroleum Gas
Or,
Liquid petrol Gas
CNG=Compressed Natural Gas
Hope it helps....
Good luck on your assignment
Oxygen gas in a gas tank has an inital temperature of 325 K, and a pressure of 5 atm. If the gas is cooled to 280K, what will the new preasure be? (Gay-Lussac's Law)
Answer:
Final pressure = [tex]4.31atm[/tex]
Explanation:
According to Gay-Lussac's law the pressure of a given mass of gas varies directly with the absolute temperature of the gas, provided the volume is kept constant.
SEE THE ATTACHMENT BELOW FOR STEP BY STEP EXPLANATION
Matter can not be created nor destroyed: it can only be
a)Destroyed a little bit
b)Invisible
c)Transformed, changed
d)None of the above
Answer:
C- transforemed or changed
Explanation:
matter can be changed by application of heat or cold
Identify the correct same regarding the strength of chemical bonds
A. Strong bonds require less energy in the form than weak bonds
B.Weak bonds require less energy to Form bonds than strong bonds
C. Strong bonds occur with high temperature and weak bonds with low temperature
D. Weak bonds require more key to formed and strong bonds
Answer:
weak bonds require less energy to form bonds than strong bonds
how much air in tons do you think there is in a normal sized bedroom whoever gets the closest will be marked as the brainiest :)
Answer:
get a little more than that is a great deal for the company and inventor of a company how can we get u a great job with their best friend in a few months but il will send you i will be the only person I know of fishes and the best I have to ask me to make it to my own home wifi and I am grade up to the same thing and the same way of the American people I have a lot to make a simple one person
A 18 g sample of metal is heated to 96°C and placed in a calorimeter containing 21 g of water at an initial temperature of 24°C. After the metal cools in the water bath, the final temperature inside the calorimeter is 26°C. What is the (positive) specific heat of the metal rounded to the HUNDREDTHS place? (hint: final temperatures of metal and water are the same). Do NOT include units. *
Answer: 140
Explanation:
Given the following :
Mass of metal = 18g = 0.018kg
Mass of water (calorimeter) = 21g = 0.021kg
Initial temperature of metal = 273 + 96 = 369k
Initial temperature of water = 273 + 24 = 297k
Final temperature inside calorimeter = 273 + 26 = 299k
Temperature change of metal = 299 - 369= -70k
Temperature change of water = 299 - 297 = 2k
H = mc ΔT
m = mass
c = specific heat capacity
ΔT = change in temperature
Heat lost by metal = heat gained by water
mc ΔT = mc ΔT
Specific heat capacity of water = 4200
18 * C * ( 299 - 369 ) = 21 * 4.2 * ( 299 - 297)
0.018 × C × -70 = 0.021 × 4.2 × 2
- 1.26 × C = 0.1764
C = 176.4/1.26
C = 140
Help haha Hahahahaha
Answer:
284.395332
Explanation:
1 mole= 36.46094
so multiply 36.46094 times 7.8
and you get 284.395332
hope that helped ! Please mark brainliest I only need one more.
Which of the following of Dalton's theories do we no longer use today?
atoms of the same element are identical in size, mass, and properties
matter is composed of small tiny particles called atoms
in chemical reactions, atoms are separated, combined, or rearranged
atoms are combined in whole number ratios
Statement of Dalton's theory which is no longer used today is that matter is composed of small tiny particles called atoms as there are sub-atomic particles which are discovered.
What is matter?Matter is a substance which is made up of various types of particles which occupy space and have inertia . All living things and objects are made up of various types of particles that occupy space and have inertia .
Depending on temperature and other factors matter is able to exist in different phases. Most common of which are solid, liquid and gas. Matter can exist in more than one state depending on the temperature and pressure .
State of matter can be changed by heating or cooling and even by changing the applied pressure.When a state changes matter does not break rather its state changes though its chemical composition remains same.
Physical characteristics of matter are shape, color, size and temperature. Every matter is made up of elements which cannot be broken down further by ordinary chemical reactions.
Learn more about matter,here:
https://brainly.com/question/12972782
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are you gay my fellow human being what ever your answer have a good day
Answer:
Yes, i'm gay.
Have a nice day!!
~Narancia
