Predict two differences in the physical properties of SiO2 and SiO4
Answers
Answer:
Answer 1) In the mixture of sand, NaCl and CaCO_{3}CaCO
3
first separation was done by dissolving the mixture in water. In the first step the NaCl will get dissolved whereas, CaCO_{3}CaCO
3
will be undissolved and sand will settle at the bottom. Here, the physical property of solubility of NaCl in water is taken into consideration. The collected water is then filtered off and evaporated to get the NaCl back from the mixture with some loss. No chemical change occurs in case of NaCl extraction from water.
Answer 2) When CaCO_{3}CaCO
3
was to be removed from the undissolved part. The chemical property of CaCO_{3}CaCO
3
was used. Where it gets dissolved in acidic medium. And this way we can extract CaCO_{3}CaCO
3
and remove sand from it. We change the chemical composition of CaCO_{3}CaCO
3
by adding HCl to the mixture and dissolve CaCO_{3}CaCO
3
to form CaCl_{2}CaCl
2
which gets dissolved into the solution of HCl. Here, first decantation occurs and then extraction is done. Second, extraction is done using potassium carbonate in it which separates CaCl_{2}CaCl
2
from sand.
Answer 3) Here, Unknown mixture of salt and sand weighed =7.52 g (before washing);
Unknown mixture of salt and sand weighed =3.45 g (after washing);
To calculate the amount of salt in it, we can simply subtract the values of before and after washing change in weights.
The property of NaCl being soluble in water it will go away with washing leaving behind the sand only, after washing.
So, Weight of salt was = 7.52g - 3.45 g = 4.07g
To find the percentage of sand that was mixed with salt =
(3.45 g sand / 7.52g of mixture) X 100 = 45.9% sand was mixed with salt.
To verify whether the correct percentage of salt and sand was calculated we can recheck the value for salt as well.
(4.07 g of salt / 7.52g of mixture) X 100 = 54.1% salt
On adding we get, 45.9% + 54.1% = 100%.
Which confirms that the calculations are correct.
Explanation:
Hope its Helps you ! : )Related Questions
2. You water three sunflower plants with salt water. Each plant receives a different
concentration of salt solutions. A fourth plant receives pure water. After a
two-week period, the height is measured.
IV
I
DV
CG
Answers
Answer:
Independent variable, is the amount of salt water received by each plant
Dependent variable, is the height of each plant
Control group, is the fourth plant that received pure water.
Note: The question is incomplete. The complete question is as follows: For the following experiments, define the independent variable (IV), dependent variable (DV) and control group (CG).
2. You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured.
Explanation:
Independent variable: An independent variable is a variable that an experimenter changes or controls and which has a direct effect on the dependent variable.
In the experiment above, the independent variable is the amount of salt water received by each plant because it is under the control of the experimenter and also is thought to have a direct effect on the height of plants.
Dependent variable: A dependent variable is a variable that is being measured or studied in an experiment, and it depends on the independent variable for its results.
The height of the plants is the dependent variable as it depends on the amount of salt water the plant receives.
Control group: The control group is the group in an experiment or study that does not receive the treatment as the other groups being studied and as such, is not influenced by the independent variable. Therefore, it is used as a standard for the other groups under study.
In this experiment, the control group is the fourth plant that received pure water.
why is it important to not dispose of medicine this way
Answers
Answer:
Because Environmental Risks
Explanation:
Medicines poured down the drain can enter the environment and your community’s drinking water supplies. And it can cause a lot of diseases!
I have a test in chem soon can any one help me?
Answers
Answer:
I will be glad to
Fill in the blanks using terms from this unit.
Even though plants are rooted in the ground, they still move, exert
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choose your answer...
and do
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choose your answer...
.
Plant cells have very strong cell walls that allow
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choose your answer...
to build up inside of the cell as water is absorbed. This pressure is called
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choose your answer...
.
When turgor pressure is high enough in a cell, the cell walls become
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choose your answer...
and As a result, the cell becomes rigid and the plant is able to stand
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choose your answer...
and straight. When a plant does not get enough water, the turgor pressure inside of the cells
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choose your answer...
.
A decrease in pushing against the cell wall causes the cells to lose their
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choose your answer...
and This causes the plant to begin to droop, or
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choose your answer...
.
When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.
Answers
Answer:
Even though plants are rooted in the ground, they still move, exert force, and do work.
Plant cells have very strong cell walls that allow pressure to build up inside of the cell as water is absorbed. This pressure is called turgor.
When turgor pressure is high enough in a cell, the cell walls become firm and as a result, the cell becomes rigid and the plant is able to stand tall and straight.
When a plant does not get enough water, the turgor pressure inside of the cells decreases. A decrease in pressure pushing against the cell wall causes the cells to lose their shape and shrink. This causes the plant to begin to droop or wilt.
When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.
Explanation:
how many moles of H2O would be produced if 10.0 mol of iron hydroxide react completely?
Answers
10.0 mol of water would be produced if 10.0 mol of iron hydroxide react completely. The number of elementary units of a particular substance are present is mole.
The Worldwide System for Units (SI) uses a mole (symbol mol) as the unit of material amount. The number of elementary units of a particular substance are present in an object and sample is determined by the quantity of that material.
Exact 6.022140761023 basic entities make up the mole. An elementary entity can be a unit of matter such as a molecule, a pair of ions, an ion pair, and a subatomic particle like a proton depending on the makeup of the substance.
Fe(OH)\(_2\)→FeO + H\(_2\)O
moles of iron hydroxide= 10.0 mol
According to stoichiometry
moles of H\(_2\)O= 10.0 mol
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1. The unique property of an element is called
(B) valiancy
(D) oxidation number
(A) Electric negativity number
(C) Mobility
Answers
A special characteristic of an element that describes how well it can mix with other elements or compounds in chemical reactions is called the oxidation number.
What is an element's oxidation number?The number of electrons an atom or ion has either gained or lost in comparison to the neutral atom is known as the oxidation number or state of the atom or ion. Group I, 2, and 3 electropositive metal atoms lose a certain number of electrons, and their positive oxidation numbers remain constant.
Electronegative Elements – What Are They?The ability of an atom to draw shared electrons in a covalent connection is referred to as electronegativity. The stronger an element attracts the shared electrons, the higher its degree of electronegativity.
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A container holds three gases at a total pressure of 800 kPa. If the partial pressure of the first gas is 100 kPa and the partial pressure of the second gas is 300 kPa, what is the partial pressure of the third gas?
Answers
We can make use of the fact that the total pressure of the mixture is the same as the sum of the partial pressure of all the gases in the container. As a result, 400 kPa is the third gas' partial pressure.
What exactly is a partial pressure law?The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases, according to Dalton's law of partial pressures. The partial pressure is the pressure that each gas would have if it occupied the same volume of the mixture at the same temperature on its own.
Mathematically, this can be stated as:
P_total = P_1 + P_2 + P_3
When we plug these figures into the formula, we get:
800 kPa = 100 kPa + 300 kPa + P_3
When we simplify this equation, we obtain:
800 kPa = 400 kPa + P_3
By taking away 400 kPa from both sides, we arrive at:
P_3 = 400 kPa
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The equilibrium reactions for diprotic oxoacids with a general formula H2XO4 are represented by the equations above. The acid ionization constants for H2SeO4 and H2TeO4 are provided in the table. Which of the following best explains the difference in strength for these two acids?
A. H2SeO4H2SeO4 is weaker because SeSe has a smaller positive formal charge than TeTe, resulting in a decrease in its ability to transfer an H+H+ to H2OH2O.
B. H2TeO4H2TeO4 is weaker because TeTe has a smaller positive formal charge than TeTe, resulting in a decrease in its ability to transfer an H+H+ to H2OH2O.
C. H2SeO4H2SeO4 is weaker because SeSe is more electronegative than TeTe, resulting in more stable conjugate bases HSeO4−HSeO4− and SeO42−SeO42− than those for H2TeO4H2TeO4 .
D. H2TeO4H2TeO4 is weaker because TeTe is less electronegative than SeSe, resulting in less stable conjugate bases HTeO4−HTeO4− and TeO42−TeO42− than those for H2SeO4H2SeO4.
Answers
The difference in strength between \(H\)₂\(SeO\)₄ and \(H\)₂\(TeO\)₄ is due to the electronegativity and formal charge of their constituent elements. and the correct explanation is provided in option A.
The acid ionization constants provided in the table show that \(H\)₂\(SeO\)₄ has a larger \(Ka\)₁ value than \(H\)₂\(TeO\)₄, indicating that it is a stronger acid. The difference in electronegativity between \(Se\) and \(Te\) is not significant enough to affect the acid strength in the way described in options C or D. Additionally, option B is incorrect as it repeats the same information for \(TeTe\) without explaining how it affects the acid strength.
The correct explanation is provided in option A. The smaller positive formal charge on SeSe compared to \(TeTe\) results in a weaker ability to transfer a \(H\)⁺ to \(H\)₂\(O\), making \(H\)₂\(SeO\)₄ a weaker acid than \(H\)₂\(TeO\)₄. This is because a smaller positive charge on the central atom in an oxoacid leads to a more diffuse electron density around the \(O-H\) bond, resulting in a weaker bond and a greater tendency to lose a proton.
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Which of the following is the main cause of acid rain?
water vapor
photosynthesis
ozone depletion
smog
Answers
Answer:
photosynthesis
Explanation:
Answer:
Photosynthesis
Explanation:
I had it on a quiz.
What is the chemical formula for dinitrogen monoxide?
А
NO
B
NO
С
2NO2
D
N20
Answers
Good luck with your chemistry!
Answer:
N20
Explanation:
A household in Abu Dhabi consumes a monthly average electric energy of 3750 kWh. The majority of electricity generation capacity in Abu Dhabi is produced oy natural gas-fuelled power generation plants. If gas turbines consume 0.21 m
3
of equivalent natural gas for every 1kWh of electricity produced. 1. Convert the monthly energy use of the household to m
3
of natural gas equivalent and kg of oil equivalent. [hint: assume the conversion efficiency of natural gas turbine to be 33% ] 2. Assuming the average CO
2
emissions coefficient for gas fired power plants is 400 g/kWh, what is the CO
2
footprint in kilograms of the household in that month?
Answers
The answers to the given problem are monthly energy use of household in m3 of natural gas equivalent = 787.5 m³, Monthly energy use of household in kg of oil equivalent = 0.29484627 ktoe, CO2 footprint of household in kg = 1500 kgCO2 (1.5 metric tonnes of CO2).
1) Calculation of monthly energy use in m3 of natural gas equivalent:For every 1 kWh of electricity produced, the gas turbines consume 0.21 m³ of natural gas equivalent.
The consumption of natural gas equivalent can be calculated by multiplying the monthly average electric energy consumption by the quantity of natural gas equivalent that is consumed by gas turbines for every 1 kWh of electricity produced.
So, the monthly consumption of natural gas equivalent will be,
3750 kWh * 0.21 m³/kWh = 787.5 m³ of natural gas equivalent
Calculation of monthly energy use in kg of oil equivalent:
Assuming that natural gas has a calorific value of 55.5 MJ/m³, and that the conversion efficiency of natural gas turbine is 33%, the equivalent energy that will be produced from 1 m³ of natural gas is 55.5 x 0.33 = 18.315 MJ/m³.
In order to calculate the equivalent energy that will be produced from 787.5 m³ of natural gas, we can use the formula:
Equivalent energy = calorific value of natural gas x volume of natural gas x conversion efficiency
So, the equivalent energy that will be produced from 787.5 m³ of natural gas is,
Equivalent energy = 55.5 x 787.5 x 0.33
= 12337.3125 MJ
= 12.337 GJ
So, the monthly consumption of oil equivalent will be:
12.337 GJ / 41.868 = 0.29484627 ktoe (kilo tonnes of oil equivalent)
2) Calculation of CO2 footprint in kg:
Assuming the average CO2 emissions coefficient for gas fired power plants is 400 g/kWh.
The CO2 footprint in kg can be calculated by multiplying the monthly average electric energy consumption by the CO2 emissions coefficient of gas-fired power plants.
So, the CO2 footprint in kg will be:
3750 kWh x 0.4 kg/kWh = 1500 kgCO2 (i.e., 1.5 metric tonnes of CO2).
Therefore, the answers to the given problem are:
Monthly energy use of household in m3 of natural gas equivalent = 787.5 m³
Monthly energy use of household in kg of oil equivalent = 0.29484627 ktoe
CO2 footprint of household in kg = 1500 kgCO2 (1.5 metric tonnes of CO2).
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give a reason why it is not advisable to heat magnesium before heating ammonium nitrate
Answers
Answer:
it can result in an increasing risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)
Magnesium can result in an increased risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)
What is ammonium nitrate?Ammonium nitrate is used commonly in fertilizers; in pyrotechniques, herbicides, and insecticides; and in the manufacture of nitrous oxide.
When ammonium nitrate is heated, it decomposes exothermically into nitrous oxide and water.
Hence, Magnesium can result in an increased risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)
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the hazcom requires all of the following to be included on chemical labels except
Answers
All the options given regarding the hazard communication standard are correct except option D "prepare and post a list of employees who handle hazardous and toxic substances in the workplace".
What are toxic substances?
Toxic substances are substances that can cause harm to living organisms, including humans, animals, and plants. These substances can be natural or human-made, and they can come in many different forms, including solids, liquids, and gases.Toxic substances can cause harm in a number of ways, including by damaging cells, disrupting bodily functions, and interfering with the body's natural processes. They can cause acute effects, such as immediate illness or death, or chronic effects, which may not appear for years or even decades.Some examples of toxic substances include heavy metals such as lead and mercury, pesticides and herbicides, toxic gases like carbon monoxide, and many types of chemicals and industrial solvents.To know more about toxic substances, click the link given below:
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_______a non-Apple operating system used on mobile devices such as tablets.
Answers
Answer:
What's the question though?
Answer:
android.
Explanation:
trust
Some of substances in the collection are solutions. Make a list of them and say what parts are dissolved (solutes) and what they are dissolved in (solvents).
Answers
A solution is composed of a solute and a solvent
What are solutions in chemistry?Your question is incomplete but I can see that you want to know something about solutions.
A solution in chemistry is a hom----ogeneous mixture of two or more substances. In a solution, the solute is the substance that is dissolved in the solvent to form the mixture. The solute particles are evenly dispersed in the solvent, resulting in a uniform composition throughout the solution.
Solutions can be either liquid, gaseous, or solid, depending on the state of the solute and solvent. For example, a sugar solution is a mixture of sugar dissolved in water, where the water is the solvent and the sugar is the solute. A gaseous solution is a mixture of gases, such as air, which is a mixture of nitrogen, oxygen, and other gases.
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A boulder rests on a ledge 31.2 m above a lake. If it has 2.65 x 10 J of gravitational
potential energy relative to the lake surface, what is the mass of the boulder?
Answers
Answer:
This question is incomplete, the gravitational potential energy is 2.65 x 10^5 J
mass of the boulder = 866.7g
Explanation:
Potential energy (P.E) refers to the energy due to the position of a body. It can be calculated as follows:
P.E = m × g × h
Where;
m = mass of substance (g)
g = acceleration due to gravity (m/s²)
h = height (m)
According to the information provided in this question,
h = 31.2 m
g = 9.8m/s²
m = ?
P.E = 2.65 x 10^5 J
Using P.E = m × g × h
2.65 x 10^5 = m × 9.8 × 31.2
2.65 x 10^5 = 305.76m
265000 = 305.76m
m = 265000 ÷ 305.76
m = 866.69
mass of the boulder = 866.7g
explain a mixture of molecules
Answers
Answer:
A mixture of molecules is a group of molecules in which there are multiple different elements and atoms, that are in either fixed proportions or random. There are heterogeneous and homogenous mixtures.
Explanation:
Determine whether each statement is a description of a physical property or a chemical property. Please check the box that applies.
Copper conducts heat well.
physical
chemical
Alcohol has a sweet odor.
physical
chemica
Answers
Answer:
A.physical
A.physical
Explanation:
The measurable properties are said to be the physical property of the substance. The conductivity of heat and the sweet odor are physical properties. Thus, options 1. a and 2. a is correct.
What is physical property?Physical properties are the characteristics of the substance that can be measured and observed directly. There is only change in the phases of matter involved.
The alterations in the chemical compositions and reactivity are not characteristic of the physical properties. It does not occur or requires a chemical reaction.
The copper conducting heat and the sweet smell of alcohol are physical properties as conductivity and odor are the physical traits along with malleability, hardness, solubility, etc.
Therefore, the conductivity of copper and sweet smell are physical properties.
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HELP PLS
I NEED THE BOTTOM TO BE a matched up by the top PLS ASSAPPp
Answers
Answer:
a: milliliters and grams | b: heat | c: force | d: solid | e: attraction
Explanation:
A: milliliters are cubic and grams are weight.
b: heat make particles go faster
c: thus more collisions and temperature and force
d: solid, they can't move, just vibrate
e: attraction
NEED HELP ASAP, how many molecules are in 4nh3
Answers
Answer:
maybe 16?
Explanation:
How do the properties of a compound compare to the properties of the elements that make it up?
Answers
Answer:
A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds
quotes for climate change
for example ‘’CLIMATE CHANGE IS REAL!’’
‘’SMALL CNAGES CAN MAKE A DIEFFENCE!’’
give me 3 and more
Answers
Answer:
Explanation:
WAKE FOR CLIMATE CHANGE IS NOT FAKE
SAVE THE GLACIERS
HELP THE ARCTIC ANIMALS
write a balanced chemical reaction between the acid and sodium hydroxide, the base, when the reaction forms water and a sodium salt. (hint: the salt will have both sodium and potassium in it
Answers
This is a balanced chemical reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) which results in the formation of sodium chloride (NaCl) and water (H2O).
In this reaction, the acid (HCl) and the base (NaOH) undergo a neutralization reaction where the hydrogen ion (H+) from the acid reacts with the hydroxide (OH-) from the base to form water (H2O). The remaining ions, Na+ from the base and Cl- from the acid, combine to form the salt, sodium chloride (NaCl).
It is important to note that the salt formed in this reaction contains only sodium and chlorine ions and not potassium. The hint provided in the question may be incorrect or misleading.
Hi! To write a balanced chemical reaction between an acid and sodium hydroxide, we first need to determine the acid that contains potassium in its formula. In this case, the acid is potassium hydrogen phthalate (KHP), with the chemical formula KHC₈H₄O₄.
KHC₈H₄O₄ (aq) + NaOH (aq) → H₂O (l) + NaKC₈H₄O₄ (aq)
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A balanced chemical reaction between an acid and sodium hydroxide, forming water and a sodium salt, can be represented by the following equation HCl + NaOH → NaCl + H2O
In this reaction, hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to produce sodium chloride (NaCl) and water (H2O). The reaction is a neutralization reaction, where the acid and base react to form a salt and water. The resulting salt, sodium chloride, contains both sodium and chlorine ions.
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With pollution on the rise, and demand for fresh water increasing, world leaders are concerned that in the future many people will not have access to clean drinking water. Select the statement that best describes the long-term global effects of this behavior.
People do not need to be concerned because there is an unlimited supply of fresh water on the Earth so we will never run out.
Fresh water is a limited resource. If we pollute the fresh water we have, there will be a shortage of clean drinking water in the future.
The Earth is getting warmer and if all the ice melts the sea level will rise and we will have more fresh water.
There will always be enough fresh water because the Earth is about 75% water and it surrounds every continent.
Answers
Fresh water is a limited resource. If we pollute the fresh water we have, there will be a shortage of clean drinking water in the future.
A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. Which element leaks the slowest from the container?.
Answers
A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. The element leaks the slowest from the container is fluorine.
The effusion of gas is expressed as follows :
rate ∝ 1 / √M
rate of effusion is inversely proportional to the square root of molecular weight.
molecular weight of nitrogen = 14amu
molecular weight of oxygen = 16 amu
molecular weight of fluorine = 19 amu
the rate of effusion with increase of molecular weight. so the elements leaks the slowest from the container is fluorine.
Thus, A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. The element leaks the slowest from the container is
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difference between atom and molecule
Answers
Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together. An ion is a positively or negatively charged particle.
Answer:
atoms constitute molecules; molecules are formed by the union of 2 or more atoms
Explanation:
How many moles are in 8.35 g of H2O?
(show all work)
Answers
Answer: 0.463 mol (to 3 sf)
Explanation:
The atomic mass of hydrogen is 1.00794 g/mol.The atomic mass of water is 15.9994 g/mol.So, the mass of water is 2(1.00794)+15.9994 = 18.01528 g/mol.
This means that in 8.35 grams of water, there are:
8.35/18.01528, which is 0.463 mol (to 3 sf)which chemical reaction absorbs energy?
A. photosynthesis
B. explosion
C. current produced by a battery
D. combustion of fuels
E. activated hand warmers
Answers
Answer:
A is your answer
a dry cell is better than a simple cell
Answers
Answer:
False.........................
what is chemical reaction?
Answers
Answer:
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Explanation:
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