The variables that might affect the investigation while dissolving different masses of salt are temperature and mass of the salt.
In the provided investigation, what are the independent and dependent variables?A variable that changed during the inquiry is regarded as an independent variable and is called "mass of salt dissolved in water." While the investigation's dependent variable, "boiling point of salt solution," is a variable that was monitored.
What are variables in a laboratory?There are numerous things that can be changed to see how they affect other things. Variables are the changeable quantities. Any element, character trait, or condition that can exist in a variety of forms or concentrations is a variable. Independent, dependent, and controlled variables are the three types of variables that often make up an experiment.
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Neera and Tom dissolved different masses of salt in 500 cm3 of water.
They measured the temperature at which each salt solution boiled.
(a) They wrote down the variables that might affect the investigation.
temperature of the laboratorymass of salt dissolved in waterstarting temperature of the waterboiling point of salt solutionvolume of watertype of salt used(i) What is the independent variable (the variable they changed) in
their investigation?
(ii) What is the dependent variable (the variable they measured) in
their investigation?
(iii) Which variable above would affect the experiment the least?
If you react 35.1g of calcium 37.1g of oxygen.
Which is limiting reactant and how much product can be made
The limiting reactant would be calcium and the amount of product that can be made would be 7.14 grams.
Stoichiometic problemCalcium reacts with oxygen to form calcium oxide according to the following balanced equation:
[tex]2Ca + O_2 --- > 2CaO[/tex]
In other words, the mole ratio of Ca to O is 2:1.
Mole of 35.1 g Ca = 35.1/40 = 0.1275
Mole of 37.1 g O = 37.1/16 = 2.3188
This means that oxygen is in excess while Ca is the limiting reagent.
The mole ratio of Ca to CaO is 1:1, thus the equivalent amount of CaO that will be produced will also be 0.1275 moles.
Mass of 0.1275 moles CaO = 0.1275 x 56 = 7.14 grams
In other words, the limiting reactant of the reaction is calcium while the amount of the product that can be made is 7.14 grams.
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does Earth's atmosphere carry gases and this affects our weather constantly. true or false
the correct answer is True
5. CCC Patterns Look at the melting points for the metals in the fourth and fifth periods of the
periodic table in the figure. Describe the general pattern in the relationship between a metal's
position in the table and its melting point.
Periodic trends are particular patterns that appear in the periodic table and highlight various characteristics of a certain element, such as its size and electrical capabilities. Electronegativity, ionization energy, electron affinity, atomic radius, melting temperature, and metallic nature are important periodic trends.
What is the general pattern in the relationship between a metal's position in the table and its melting point?Within a period, the elements' ionization energies tend to rise from left to right. Valence shell stability is to blame for this.
In general, an element's ionization energy falls from top to bottom within a group. The reason for this is electron shielding.
The graph shows that the entire valence shells of the noble gases give them extremely high ionization energy. Keep in mind that among all the elements, helium has the highest ionization energy.
Within a time frame, electron affinities shift from left to right. The shrinkage of atomic radius is to blame for this.
Within a group, electron affinity diminishes from top to bottom. The rise in atomic radius is to blame for this.
This results from an overall rise in the amount of protons and electrons throughout time. Since each proton exerts more force than each electron, electrons are drawn inward and reduce the radius of the atom.
Within a group, atomic radius grows from top to bottom. The reason for this is electron shielding.
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[tex] \sf { \fcolorbox{green}{g}{What is \: the diffrence between alkali and base in simple defination}} [/tex]
Answer:
All alkalies are bases but all bases are not alkaliesall alkalies are soluble in water but all bases are not alkalies .hope it is helpful to you
Answer:
[tex] \sf { \fcolorbox{green}{g}{\: the diffrence between alkali and base in simple defination are:}} [/tex]
[tex] \sf { \fcolorbox{green}{g}{\:All alkalies are bases but all bases are not alkalies }} [/tex][tex] \sf { \fcolorbox{green}{g}{\:all alkalies are soluble in water but all bases are not alkalies. }} [/tex]What would be the electron configuration for neutral oxygen? Please show what energy level each electron is in using the electron diagonal filling rule do not use noble gas configuration.
Answer: 1s2 2s2 2p4
Explanation:
Recall the number of electrons an orbital can have:
s orbitals have 2, p orbitals have 6, d orbitals have 10, f orbitals have 14, and so on.
Oxygen in its neutral state would have 8 electrons.
To summarize the diagonal filling order, it goes from the least energy level to the most, and the orbital with the least amount of orbitals to the most.
So, the order for this will go from 1 and end at 2 (for energy level,) then s, s again (as energy level 1 has 1s orbital only,) and p.
So, the first energy level, 1s2 (2 electrons), leaves the remaining six electrons.
Completely fill the s orbital (another 2 electrons), and the remaining 4 electrons will be in the respective p orbital.
Thus, it is 1s2 2s2 2p4.
5. Calculate the difference between the heats of reaction (□H-□E) at constant pressure and constant volume for the reaction C6H6(l) + 15 0₂ (g) → 12 (0₂(g) + 6H₂0 (l)
The difference between the heats of reaction (□H - □E) at constant pressure and constant volume can be calculated using the following equation:
□H - □E = □H - □V + □V - □E
Where □H is the heat of reaction at constant pressure, □E is the heat of reaction at constant volume, □V is the change in volume at constant pressure, and □E is the change in internal energy at constant volume.
To calculate the difference between the heats of reaction at constant pressure and constant volume for the given reaction, we need to know the values of □H, □V, and □E. Without this information, it is not possible to calculate the difference between the heats of reaction at constant pressure and constant volume.
Q. 2 A and B are powders, A is insoluble while B dissolves to give a pH 3 solution. Mixing A and B gives bubbles or effervescence and a clear solution. Which is the acid? If the other substance is a carbonate, name the gas given off. Even though A is insoluble a clear solution is given off, explain why.
Answer:
From the information provided, it seems likely that substance A is an acid, and substance B is a carbonate. The fact that mixing the two substances results in bubbles or effervescence, and that a clear solution is formed, suggests that a chemical reaction is taking place.
Acids and carbonates react together to form a salt, water, and carbon dioxide gas. The reaction is as follow:
Acid + Carbonate → Salt + Water + Carbon Dioxide
The carbon dioxide gas forms bubbles in the solution and causes effervescence, and the clear solution formed is due to the fact that both the acid and the carbonate have reacted together to form the salt and water. This reaction is acid-base neutralization reaction as the acid and base will neutralize each other.
As for the acid, since it is said that B gives pH 3 solution after dissolved, it can be inferred that it is not an acid, otherwise it would be acidic. Therefore A which is insoluble is the acid.
As for the gas given off, it's Carbon dioxide.
Explanation:
What is the distinction between electronic and ionic conduction? Answer: When a current arises from a flow of Choose the answer from the menu for the missing word in the middle of the sentence in accordance to the question statement electrons , the conduction is termed electronic; for ionic conduction, the current results from the net motion of Choose the answer from the menu for the missing word at the end of the sentence in accordance to the question statement ions .
Answer:
Electronic conduction is the movement of electrons whereas ionic conduction is the movement of ions.
Explanation:
When a current arises from a flow of electrons, the conduction is termed as electronic conduction while on the other hand, for ionic conduction, the current results from the net motion of ions from one atom to another. The difference between electronic and ionic conduction is that electronic conduction refers to the movement of electrons from one region to another, whereas ionic conduction is the movement of ions from one atom to another during bond formation.
what mechanism of formation of magma is represented by the experiment.justify your answer
need Kona Po please
Explanation:
This hot material rises to an area of lower pressure through the process of convection. Areas of lower pressure always have a lower melting point than areas of high pressure. This reduction in overlying pressure, or decompression, enables the mantle rock to melt and form magma.
For the reaction C + 2H2 → CH4, how many grams of carbon are required to produce 14 moles of methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Carbon 12
The amount, in grams, of carbon required to produce 14 moles of methane according to the reaction would be 168.0 grams.
Stoichiometric problemFrom the balanced equation of the reaction, the mole ratio of the carbon that reacts and the methane produced is 1:1. In other words, 1 mole of carbon will produce 1 mole of methane.
Thus, for the production of 14 moles of methane:
1 mole methane = 1 mole carbon
14 moles methane = 14 x 1/1 = 14 moles carbon.
Recall that, mass = mole x molar mass.
The molar weight of carbon is given as 12 g/mol
Mass of 14 moles carbon = 14 x 12 = 168 grams
In other words, for the illustrated reaction, the amount of carbon required to produce 14 moles of methane would be 168.0 grams.
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please help me! ASAP
Answer:
(1) 4- ethyl -6 methyl -2 octyne
determine the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay. The half-life of the isotope is 16.5 hours.
Based on the given half-life, the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is 33 hours.
What is the half-life of a radioactive isotope?The time needed for a quantity to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.
Any substance that contains unstable atoms that release ionizing radiation during their natural decay is considered radioactive material.
Given the half-life of the radioactive sample of an isotope of bromine to be 16.5 hours. The amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is calculated as follows:
After one half-life, half of the sample remains, and half decays
After two half-lives, 1/4 of the sample remains, and 3/4 decays
The time for two half-lives = 16.5 hours * 2
The time for two half-lives = 33 hours.
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I need help in this please
it reflects back into the glass with a 45 degree angle of reflection.
What is refraction?The direction of the light changes as it passes through the air-water barrier. Refraction is the name for this phenomenon. Filling a glass with water and inserting a straw will make it simple to see. It will seem as though the straw is shattered.
Because light travels at a different speed in air and water, refraction takes place. The electromagnetic properties of a specific medium, which differ for air and water, determine the speed at which a light wave propagates in that medium. The speed of light in the air is very near to the vacuum's speed of light, which is 3*108 m/s. The speed of light is slower underwater. Consequently, The direction of the light changes as it passes through the air-water barrier. Refraction is the name for this phenomenon. Filling a glass with water and inserting a straw will make it simple to see. It will seem as though the straw is shattered.
A form of break occurs in the wavefront of propagating light when it encounters the air-water barrier, causing the ray of light to diverge from its original path. (Please go to the reference link for a more thorough explanation and instructions on how to calculate the light's refraction angle.)
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in this task, you’ll observe a chemical reaction between baking soda and vinegar. How do you think the temperature of the reactants and the rate of reaction are related? Write a hypothesis to predict the relationship between the two parameters.
The temperature of both the reactants and the pace of reaction are correlated in the chemical reaction of baking soda and vinegar the warmth of the reactants causes a raise in the rate of action and vice versa.
Which is a chemical reaction *?When two or more compounds come into touch with one another and create a new substance, the process is known as a chemical reaction (s). Reactants or reagents are the name(s) for the substance(s) or substances that are initially incorporated into the chemical process.
What's the most important chemical reactions?A few synthesis processes can produce several products. One of the more significant chemical processes on Earth is photosynthesis. It enables some microorganisms and plants to transform carbon dioxide gas and water into storable glucose and oxygen. For life to exist on Earth, we need this oxygen.
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Bauxite ore contains aluminum oxide, which is decomposed using electricity to
produce aluminum metal and oxygen. What mass of aluminum metal can be
produced from 125 g of aluminum oxide?
Answer:
66.48 g.
Explanation:
Bauxite ore contains aluminium oxide which is decomposed using electricity to produce aluminium metal and oxygen gas
What is the empirical formula of a compound consisting of 48.64% C, 8.16% H, and 43.20% O by mass? Assume 100.0g total of unknown compound.
Answer:
empirical formula of the compound is CH2O
Explanation:
Chemicals released into the air from human activity, such as sulfur dioxide and nitrous oxide, interact with the atmosphere to make acid rain.
in which atmosphere layer does this process happen?
A, thermosphere
B, mesosphere
C, troposphere
D, stratosphere
I NEED HELP ASAP!!!!!!
Troposphere atmosphere layer does this process happen The acidity of rainwater comes from the natural presence of three substances (CO2, NO, and SO2) found in the troposphere
What is troposphere?The lowest part of Earth's atmosphere is called the troposphere. The troposphere contains the majority of the mass of the atmosphere (about 75–80%). The troposphere is where most clouds of all varieties may be found, and this is also where most weather takes place.The lowest portion of our atmosphere is called the troposphere. It begins below the surface and rises to a height of roughly 10 kilometers (6.2 miles, or about 33,000 feet) above sea level. The troposphere, where we are located, is the lowest layer where most weather happens.Most weather occurrences occur in the troposphere, which is the first and lowest layer of the Earth's atmosphere. It includes 99% of the planet's water vapour and aerosol mass and 75% of the total mass of the planetary atmosphere.To learn more about troposphere refers to:
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I understand how a change in the size of the moon jellies' resource population can change the number of births in the moon jelly population.
Responses
Explain your answer choice.
A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.
How do moon jellies reproduce?When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.
There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.
So we can conclude that a large population of resources will lead to more births.
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Find the number of moles of oxygen atoms in 3.00 mol of copper(II) sulphate pentahydrate.
Answer:
9 times Avogadro's number, because there are a total of 9 oxygen atoms in the copper sulfate hydrate being considered: 4 from the sulfate
Explanation:
Which one of the following pairs are the common languages of science?
A. English & Latin
B. Mathematics & Units
C. Standards & Measures
D. English & French
Answer:
a whole new world too be into
Explanation:
What is the mass of a 8.45 m3 piece of copper?
The mass of a 8.45 m3 piece of copper is 7537.4 grams.
What is mass?Mass is described as a dimensionless quantity representing the amount of matter in a particle or object.
density of copper =8.92g/cm^3
volume = 8.45 x 100 cm^3
mass = (8.45 x 100) x 8.92
mass = 7537.4 grams.
The relationship between mass, density and volume is that density offers a convenient means of obtaining the mass of a body from its volume or vice versa.
This means that the mass is equal to the volume multiplied by the density (M = Vd), while the volume is equal to the mass divided by the density (V = M/d).
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Waste management is important for the environment. Waste can cause pollution and disease if it is
not handled properly. There are many different methods of waste management to help ease the
environmental pressures imposed by waste. Modern methods include recycling, composting,
incineration, sustainability, landfill, integration, waste-to-energy, and waste minimization. The
planet depends on a successful approach to waste disposal.
Landfills are waste disposal sites. They are often man-made depressions in the ground covered with a
lining designed to prevent any leakage of waste materials. However, landfills can leak through the base
resulting in negative impacts on the surrounding environments. What negative impact to the
environment is caused by the production of methane gas in landfills?
A
air pollution
B)
soil fertility
groundwater pollution
D)
air pollution, groundwater pollution, soil fertility
Answer:
air pollution, groundwater pollution, soil fertility
Answer:air pollution
Explanation:
its a gas, so it will mainly effect the air
Nitrogen monoxide and oxygen gas combine to form smog. How many mols of nitrogen dioxide NO2 is produced when 34 L of oxygen 02
gas reacts.
Explanation:
Please provide the chemical reaction to allow others to help solve this problem. Assuming the system is in STP, then use the molar volume to solve for the moles of Oxygen and then use the mole ratio to determine the moles of NO2 that is produced as a result of this reactant
The information provided below was obtained from the label of the commercial stock
bottle of concentrated tetraoxosulphate (VI) acid. Calculate the volume of the acid that
is needed to prepare 8dm3
of 0.5moldm-3
solution of the compound from the stock.
Specific gravity of H2SO4 = 1.84gcm-3
% purity of acid =97%
Molar mass = 98gmol-1
The volume of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is 203 cm3.
What is volume?Volume is the amount of space that an object or substance occupies. It is typically measured in cubic units, such as metres cubed (m³). Volume is an important concept in mathematics, physics, and engineering. Volume plays an important role in everyday life; for example, the volume of water in a swimming pool can be measured to determine how much water needs to be added or subtracted. Volume is also used to measure the amount of a substance, such as oil or gas. The volume of a container can also be used to measure the amount of material contained within it. Volume can also be used to measure the capacity of a container, such as a bucket or a tank. In addition, volume can be used to calculate the mass of an object by measuring its density.
The mass of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is:
M = 8 x 0.5 x 98 = 392 g
The volume of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is:
V = 392 / (1.84 x 0.97) = 203 cm3
Therefore, the volume of acid required to prepare 8dm3 of 0.5moldm-3 solution of the compound is 203 cm3.
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What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?
Answer:
the correct answer is 6...
Answer:
The answer is 2
All solutions must be a liquid-liquid combination.
True
False
Name the only Australian mammal who is restricted to the alpine environment? ...
What is the age of the Sun? ...
What happens when lightening hit the tree? ...
What is the name of the tallest grass of the world? ...
What is the average height of Bamboo?
Calculate the pH if:
[H+] = 9.2 x 10^-8 M
Answer:
7.04Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question we have
[tex]pH = - log(9.2 \times {10}^{ - 8} ) \\ = 7.0362...[/tex]
We have the final answer as
7.04Hope this helps you
Due to friction between a tire and the road surface, the temperature of the air inside a tire increases as one drives. if the tire pressure is 179 kPa when the car is in the driveway at 5.0 C, what is the pressure of the gas inside the tire when the temperature of the gas increases to 35 C? Assume tire volume and number of particles remain constant
Answer:
40.10 atm. is answer i think ....
At which of the following temperatures is the average kinetic energy of molecules od a substance greatest
Answer:
Correct option is C)
Kinetic Energy at 20
o
C=293K
=3/2K
B
T=3/2K
B
(293)J=K.E
1
kE
2
=2K.E
1
2
2
3
K
^
B
(293)=
2
3
K
^
B
T
T=586K
=313
o
C