The opposite process of freezing is-Boiling
Boiling is the quick evaporation of a fluid that occurs when it is heated to the boiling point, which is the temperature when the liquid's vapour pressure equals the i.e. changes on the liquid by the outer air. Freezing is a phase transition that occurs when the heat of a liquid falls below its freezing temperature. According to the internationally accepted definition, freezing refers to the crystallisation phase change of a liquid or even the strimmer of a substance, which is usually caused by cooling. In science, boiling occurs when a liquid turns into a gas, forming bubbles within the liquid volume. Water is the most commonly used boiled liquid in cooking.
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Given the balanced equation representing a reaction:
Ni(s) + 2HCl(aq) - NiCl(aq) + H2(9)
In this reaction, each Ni atom
1.
loses 1 electron
2.
loses 2 electrons
لما
gains 1 electron
4
gains 2 electrons
Submit
Answer: loses 2 electrons
Explanation:
Ni Atom loses 2 electrons , Option 2 is the correct answer.
What is an Electron ?Electron is a subatomic particle (denoted by the symbol e⁻)
or whose electric charge is negative one elementary charge.
Electrons belong to the first generation of the lepton particle family and are generally thought to be elementary particles because they have no known components or substructure.
The electron has a mass that is approximately 1/1836 that of the proton.
Ni(s) + 2HCl(aq) - NiCl(aq) + H₂(g)
This is an oxidation-reduction (redox) reaction:
2 H⁺ + 2 e⁻ → 2 H (reduction)
Ni - 2 e⁻ → Ni ²⁺ (oxidation)
HCl is an oxidizing agent, Ni is a reducing agent.
Therefore Ni Atom loses 2 electrons , Option 2 is the correct answer.
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Why is the decay cycle important to ecosystems?
The decay cycle creates new matter replacing dead organisms.
The decay cycle decomposes dead organisms and creates fertile soil.
The decay cycle provides a food source for large animals.
The decay cycle brings in more water for plant in an ecosystem.
Answer:The decay decomposes dead organisms and creates fertile soil.
Explanation:it helps to digest food, and to recycle materials in our environment.
convert 5.91 x 10^26 molecules h20 to moles
Answer:
0.432 mol
Explanation:
Divide the given number of molecules by Avogadro's constant. Avogradro's constant is the number of atoms/molecules in a mole of a substance.
Therefore,
2.60
⋅
10
23
molecules
6.022
⋅
10
23
molecules/mol
=
0.432175 moles
≈
0.432 moles
Explanation:
Light is a type of energy produced by the vibration of electrically charged particles.
True or false?
Answer:
big brain
Explanation:
what is the difference between quantative and qualitative analysis
Answer:
Quantitative data can be counted, measured, and expressed using numbers. Qualitative data is descriptive and conceptual. Qualitative data can be categorized based on traits and characteristics.
Explanation:
Quantitative analysis involves looking at the hard data, the actual numbers. Qualitative analysis is less tangible. It concerns subjective characteristics and opinions – things that cannot be expressed as a number.
What is the volume, in L, of 2.50 moles of oxygen gas measured at 25.0oC and a pressure of 104.5 kPa?
Answer:
58.53 L
Explanation:
Ideal gas equation is
PV = nRT
P - the pressure of the gas = 104.5 KPa
V- the volume occupied by the gas
n - the number of moles of gas =2.50
R - the universal gas constant, usually given as 0.0821 atm.L/(mol K)
T - the absolute temperature of the gas.= 298K
[tex]V =\frac{nRT}{P}[/tex]
Now substituting vales we get
[tex]V = \frac{2.5\times0.0821\times298}{104.5\times1000}[/tex]
V = 58.53 L
Please help with this Unit Conversions problem!
"Convert 7.54 kg to mg. Show your work."
Answer:
7,540,000 mg
Explanation:
1 kg = 1,000,000 mg
7.54 kg x 1,000,000= 7,540,000 mg
Help me pretty please
Answer:
I'm pretty sure light waves do not require a medium to travel
A study was conducted to see if increasing the substrate concentration has an appreciable effect on the velocity of a chemical reaction. With a substrate concentration of 1.5 moles per liter, the reaction was run 15 times, with an average velocity of 7.5 micromoles per 30 minutes and a standard deviation of 1.5. With a substrate concentration of 2.0 moles per liter, 12 runs were made, yielding an average velocity of 8.8 micromoles per 30 minutes and a sample standard deviation of 1.2. Is there any reason to believe that this increase in substrate concentration causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
Answer:
There is not enough evidence
Explanation:
For 1.5 moles substrate concentration per liter
Reaction ( n2 ) = 15 runs
average velocity ( x2 ) = 7.5 micromoles per 30 minutes
standard deviation ( s2 ) = 1.5
For 2.0 moles substrate concentration per liter
Reaction( n1 ) = 12 runs
average velocity ( x1 ) = 8.8 micromoles per 30 minutes
standard deviation ( s1 ) = 1.2
Show Reason to believe that this increase in substrate conc causes an increase in mean velocity
Hypothesis test
H0 : μ1 - μ2 = 0.5
H1 : μ1 - μ2 > 0.5
level of significance ( ∝ ) = 0.01
attached below is a detailed solution to the problem
P-value ( 0.073 ) > level of significance ( 0.01 ) hence we fail to reject the null hypothesis
hence there in not enough evidence to believe that this increase causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
How is energy from grass passed on between animals
Calculate the ratio of the velocity of molecular oxygen to the velocity of atomic argon at the same temperature.
I asked this before but still need help
No links, I'm not d*mb
Answer:
Oxygen 1.12 X faster
Explanation:
Predict: Based on your hypothesis, which population(s) would be hurt if bears were added?
Answer:
all of em, unless the bear is normal to the environment
How many grams of KCl are made when 5.02 moles of
ZnCl2 react in the reaction below?
2KMnO4 + ZnCl2 → 2KCl + Zn(MnO4)2
lol pls help me
Answer: 747.98 grams of KCl are made when 5.02 moles of [tex]ZnCl_2[/tex] react in the reaction.
Explanation:
The balanced chemical equation is:
[tex]2KMnO_4+ZnCl_2\rightarrow 2KCl+Zn(MnO_4)_2[/tex]
According to stoichiometry:
1 mole of [tex]ZnCl_2[/tex] produce = 2 moles of [tex]KCl[/tex]
Thus 5.02 moles [tex]ZnCl_2[/tex] will produce =[tex]\frac{2}{1}\times 5.02=10.04[/tex] moles of [tex]KCl[/tex]
Mass of [tex]KCl=moles\times {\text {molar mass}}=10.04mol\times 74.5g/mol=747.98g[/tex]
Thus 747.98 grams of KCl are made when 5.02 moles of [tex]ZnCl_2[/tex] react in the reaction.
Which of the answers does not represent a common type of air pollution? A) agricultural ammonia B) carbon monoxide exhaust C) sulfur oxide D) synthetic organic compounds E) industrial nitrogen oxide
Answer:
D)
synthetic organic compounds
Explanation:
synthetic organic compounds are water pollutants
how many moles are in 2.71 molecules of carbon dioxide (CO2)
Answer:
This has already been answered but here is the answer:
2.71×10 molecules of co2 * 1 Mole CO2 /6.022 *10^23 molecules of CO2
= 4.5*10^-14 Mole CO2
1 mole of CO2 has 2 mole oxygen
4.5*10^-14 Mole CO2 *2/1
= 9.0*10^-14 Mole oxygen
Why must the mass of reactants in a chemical reaction
always equal the mass of products?
Answer:
law of conservation
Explanation:
matter cannot be destroyed nor made
How many grams are in 4.5 x 10^22 molecules of water? please show dimensional analysis
Answer:
1.1grams
Explanation:
Find moles of water:
4.5x10^22/(6.02x10^23)=0.07mol
Find molar mass of the water
O=16.00g/mol
0.07x 16.00=1.1 grams
Now describe the properties of the compound you picked(gold). Compare the properties of the compound with the properties of the elements that comprise it. How do you explain the difference?
Explanation:
Gold conducts heat and electricity. ...
Gold is ductile: It can be drawn out into the thinnest wire. ...
Gold is highly reflective of heat and light. ...
Gold is prized for its beauty. ...
Gold is malleable, so it can be flattened into extremely thin sheets.
on the other hand Gold consist of copper
Key Properties of Copper Alloys
Excellent heat conductivity.
Excellent electrical conductivity.
Good corrosion resistance.
Good biofouling resistance.
Good machinability.
Retention of mechanical and electrical properties at cryogenic temperatures.
Non-magnetic.
so the difference is that copper is less expensive and not priced with its beauty
At equilibrium A. All reactions have ceased B. Only the forward reaction continues C. Only the reverse reaction continues D. Both the forward and reverse reactions continues
Answer:
D)both the forward and reverse reactions continue.
Explanation:
Chemical equilibrium can be regarded as state whereby rate of the forward reaction is equal to rate of backward reaction. It should be noted that At equilibrium both the forward and reverse reactions continue.
HELP PLEASE ASAP!!!!!
the cell is undergoing a step of meiosis I. what step is the cell in?
a. the beginning of prophase I
b. the middle of metaphase I
c. the end of anaphase I
d. the middle of telophase I
Answer:
I think it's c
Explanation:
jenensnsjsjs
How many atoms are in 14 moles of I? Watch your significant figures.
8.4 x 1024 atoms of l
8.43 x 1024 moles of I
8.4 x 1023 atoms of l
8.43 atoms of l
Answer:
8.43 x 1024 moles of I
Explanation:
I need help in this :(
Answer:
ok follow me twitter dm me for answer The Kid D is my twitter
Explanation:
if 5 L of butane is reacted what volume of carbon dioxide is produced ILL GIVE BRAINLIEST
Answer: First, here is the balanced reaction: 2C4H10 + 13O2 ===> 8CO2 + 10H2O.
This says for every mole of butane burned 4 moles of CO2 are produced, in other words a 2:1 ratio.
Next, let's determine how many moles of butane are burned. This is obtained by
5.50 g / 58.1 g/mole = 0.0947 moles butane. As CO2 is produced in a 2:1 ratio, the # moles of CO2 produced is 2 x 0.0947 = 0.1894 moles CO2.
Now we need to figure out the volume. This depends on the temperature and pressure of the CO2 which is not given, so we will assume standard conditions: 273 K and 1 atmosphere.
We now use the ideal gas law PV = nRT, or V =nRT/P, where n is the # of moles of CO2, T the absolute temperature, R the gas constant (0.082 L-atm/mole degree), and P the pressure in atmospheres ( 1 atm).
V = 0.1894 x 0.082 x 273.0 / 1 = 4.24 Liters.
Explanation:
1. what is an ethical concern about biotechnology
2. list 2 examples of transgenic organism
3. write a 3-sentences summary on how biotechnology affects individual, society, and environment
Answer:
1. There are so many ethical concerns about biotechnology, some Ethical issues that arise from the application of modern biotechnologies include:
Discrimination of individuals because of their health or health history as a result of knowing their genetic information, minimizing harms while maximizing benefits, Interference with nature, privacy.
2. a. Plants (maize, rice)
b. Fish (GloFish)
3. For individuals, biotechnology has helped in the prevention and treatment of a wide range of diseases. For society, biotechnology saves time, improves the health and quality of food through a reduction in the use of pesticides and it can create new viruses and bacteria that cause diseases. Biotechnology could address global change since more genetically modified plants are grown.
Which of the follow can NOT be possible
error that occurs during a lab experiment?
human error
pure reactants were used
thing
O unexpected products were produced
the reaction didn't go to completion
Answer:did h find the answer
Explanation:
What is the new pressure if the temperature outside is 296k and his weight causes the tire's volume to drop to 2.0 liters
Question:
At standard temperature and pressure, the volume of a tire is 3.5L. What is the new pressure if the temperature outside is 296k and its weight causes the volume of the gas is 2.0 L?
Answer:
The new pressure is: 1.896 atm
Explanation:
At standard temperature and pressure, we have:
[tex]P_1 = 1atm[/tex]
[tex]T_1 = 273.15k[/tex]
[tex]V_1 = 3.5L[/tex]
Outside, we have:
[tex]T_2 = 296k[/tex]
[tex]V_2 = 2.0L[/tex]
Required
Determine the new pressure
Using combined gas law, we have:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
This gives:
[tex]\frac{1 * 3.5}{273.15} =\frac{P_2*2.0}{296}[/tex]
Solve for [tex]P_2[/tex]
[tex]P_2 = \frac{296 * 1 * 3.5}{273.15*2.0}[/tex]
[tex]P_2 = \frac{1036}{546.30}[/tex]
[tex]P_2 \approx 1.896 atm[/tex]
Arrange the following compounds in order of DECREASING boiling points (going from the highest to the lowest):
n-butane
n-octane
2,2,3,3-tetramethyl-butane
2-butene
Answer:
b
d
a
c
Explanation:
More carbons in longest chain = higher BP
D has a BP of 0.8
A has a BP -0.5
C is the lowest because the more branched it is the lower BP
An organ system is formed by..
A) two or more cells working together.
B) two or more tissues working together.
C) two or more organs working together.
D) two or more organisms working together
Those microscopic organisms perform what 2 processes that help pave the way for lichen by creating organic material.
Answer:
Decomposition pf residues and weathering of rock.
Explanation:
Microorganisms performs two processes such as decomposition and weathering of rock materials. These two processes make the medium suitable for the growth and development of the lichens because these processes increases nutrient and organic matter on the rock surface that is used by the lichens for its growth. In decomposition process, larger compounds are broken down into simpler substances while on the other hand, the weather of rocks causes breakdown of rock material into simpler minerals that also used by the lichens.
An atom of a certain element has 19 protons, 19 electrons, and a mass number of 39. This element is very reactive. How many neutrons are in this atom?
Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.
Answer:
There are 20 neutrons in this atom.
Explanation: