This is the difference between a homogeneous and a heterogeneous mixture.
For example, salt (NaCl) and water make a homogeneous mixture (the same proportions of its components throughout any given sample), because both substances are polar.
A solution is homogeneous mixture composed of two or more substances.
In aqueous solution, a solvent is water and solute (in this example sodium chloride) is a substance dissolved in water.
A heterogeneous mixture is not uniform in composition (in this mixture different metals and minerals), but proportions of its components (for example mixture particles of different colors, small pebbles) vary throughout the sample.
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9. Tomato plants in a garden are not growing
well. The gardener hypothesizes that the soil
is too acidic. To test this hypothesis
accurately, the gardener could
(1) plant seeds of a different kind of plant
(2) move the tomato plants to an area with
less sunlight
(3) change the pH of the soil
(4) reduce the amount of water
available to the plant
is adrenaline radioactive?
Answer:
Yes adrenaline is radioactive.
Explanation:
how many atoms are in 23 moles of oxygen ?
Answer:
23 moles Oxygen × 6.02 × 1023 atoms = 1.3846 × 1025 atoms Oxygen.
Explanation:
I will mark brainliest
Answer:
d
Explanation:
it's the only one that seems to make sense
Alcohol fermentation occurs in what type of cell
Answer:
Yeast cells
Explanation:
Gina is trying to reduce the number of indoor pollutants in her home. Indoor pollutants include pet hair and dust, which are (gases, smoke, allergens, smog), and radon and carbon monoxide, which are (gases, smog, allergens, smoke)
Gina is trying to reduce the number of indoor pollutants in her home. Indoor pollutants include pet hair and dust, which are (c) allergens and radon and carbon monoxide, which are (a) gases.
Allergens are the substances that trigger the immune system of an organism and also produce allergic effects. Allergens can induce symptoms like: redness, itching, sneezing, coughing, etc. The examples of allergens are pollens, certain microbes, dust, pet hair, etc.
Radon is a highly poisonous and radioactive gas present in the environment. It is one of the major causes for lung cancer. It is inert and colorless in nature. Radon is present in environment due to decay of uranium which is present in soil naturally.
The question is incomplete, the complete question is:
Gina is trying to reduce the number of indoor pollutants in her home. Indoor pollutants include
A- pet hair and dust, which are:
(a) gases, (b) smoke, (c) allergens, (d) smog; and
B- radon and carbon monoxide, which are:
(a) gases, (b) smog, (c) allergens, (d) smoke.
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Calculate the maximum wavelength of light capable of dissociating the f–f bond in one molecule of fluorine if the bond energy, or bond dissociation energy, is 157 kj/mol.
Maximum wavelength of light capable of dissociating the f-f bond is 7.6245 nm.
How is wavelength related to dissociation energy calculated?Wavelength related to bond dissociation energy is calculated by first calculating the energy required to break one f-f bond which is calculated as,
energy required to break a bond=bond energy/Avogadro's number
In this case which is equal to,157×10³/6.022×10²³=2.6071×10[tex]^-19[/tex] J.
Now to calculate wavelength, Planck's equation is used which is,
E=hc/λ
∴λ=6.626×10[tex]^-34[/tex]×3×10⁸/2.6071×10[tex]^-19[/tex]
=7.6245×10[tex]^-7[/tex] m or 7.6245 nm
Thus, the maximum wavelength of light capable of dissociating the f-f bond in one molecule of fluorine is 7.6245 nm.
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a 12m tall electric pole is supported by a wire from top making an angle 60 with pole.what is lenght of pole?
Answer:
i think 70inches
Explanation:
A calculation based upon _______is only as accurate as the device used for measurement.
Double-Replacement Reactions
LiCl + CaBr2 →
Cr(OH)3 + Na2CO3 →
Sr3N2 + KClO3 →
Fe(NO3)2 + AlPO4 →
CuSO4 + AgNO3 →
HCl + Ba(OH)2 →
CsCN + SnF4 →
(NH4)2S + Mg(NO3)2 →
Na2CrO4 + Mo(OH)3 →
Ni(C2H3O2)2 + H3PO4 →
Answer:
(1) LiCl + CaBr2 → CaCl2 + LiBr
Balanced
2LiCl + CaBr2 → CaCl2 + 2LiBr
(2) Cr(OH)3 + Na2CO3 → NaOH + Cr2(CO3)3
Balanced
2Cr(OH)3 + 3Na2CO3 → 6NaOH + Cr2(CO3)3
(3) Sr3N2 + KClO3 → Sr(ClO3)2 + K3N
Balanced
Sr3N2 + 6KClO3 → 3Sr(ClO3)2 + 2K3N
(4) Fe(NO3)2 + AlPO4 → Fe3(PO4)2 + Al(NO3)3
Balanced
3Fe(NO3)2 + 2AlPO4 → Fe3(PO4)2 + 2Al(NO3)3
(5) CuSO4 + AgNO3 → Ag2SO4 + Cu(NO3)2
Balanced
CuSO4 + 2AgNO3 → Ag2SO4 + Cu(NO3)2
(6) HCl + Ba(OH)2 → H2O + BaCl2
Balanced
2HCl + Ba(OH)2 → 2H2O + BaCl2
(7) CsCN + SnF4 → CsF + Sn(CN)4
Balanced
4CsCN + SnF4 → 4CsF + Sn(CN)4
(8) (NH4)2S + Mg(NO3)2 → MgS + NH4NO3
Balanced
(NH4)2S + Mg(NO3)2 → MgS + 2NH4NO3
(9) Na2CrO4 + Mo(OH)3 → NaOH + Mo2(CrO4)3
Balanced
3Na2CrO4 + 2Mo(OH)3 → 6NaOH + Mo2(CrO4)3
(10) Ni(C2H3O2)2 + H3PO4 → Ni3(PO4)2 + C2H4O2
Balanced
3Ni(C2H3O2)2 + 2H3PO4 → Ni3(PO4)2 + 6C2H4O2
how many molecules are in 9.45 moles ? ( NaNO3)
Answer:
There are 5.69*10²⁴ molecules in 9.45 moles.
Explanation:
The mole is defined as the amount of matter that particles have, that is, atoms and elementary entities.
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole and represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.
Then the following rule of three can be applied: if 1 mole contains 6.023 * 10²³ molecules, 9.45 moles, how many molecules will it have?
[tex]amount of molecules=\frac{9.45 moles*6.023*10^{23}molecules }{1 mole}[/tex]
Solving:
amount of molecules= 5.69*10²⁴⁴ molecules
There are 5.69*10²⁴ molecules in 9.45 moles.
use the internet to look up the sds for 2.0 m sodium hydroxide naoh to answer the following question a) list the potential acute
A safety data sheet is informational data that states the properties of the various chemicals. According to the SDS of NaOH, it causes irritation, nausea, eye burn, burns in the digestive system, etc.
What is SDS?SDS is abbreviated for a safety data sheet which is a document that provides information on the chemicals including the properties, health hazards, measures, safety, prevention, etc.
According to SDS, NaOH results in various potential acute health effects including vomiting, diarrhea, nausea, irritation, etc. The chronic effect includes coma, burns in the eye, respiratory infection, digestive system, dermatitis, etc.
Therefore, sodium hydroxide has various acute and chronic health effects.
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Your question is incomplete, but most probably your full question was, Use the internet to look up the sds for 2.0 m sodium hydroxide, NaOH, to answer the following question: list the potential acute and chronic health effects.
the atomic number of an element X is 15 . what would be the valency of X
Answer:
its valency must be 3
hope it helps.
Answer: -3
Explanation: an element with atomic number of 15 is Phosphorus the Electronic configuration of phosphorous is 2, 8, 5. It has 5 electrons in its last orbit which can be completely filled by accepting 3 electrons.
Weathering and erosion are the same thing. true or false? i personally think its false but just to be sure lol
Answer:
It is false.
Explanation:
Weathering is the general process by which rocks are broken down at Earth's surface. Erosion is a set of processes that loosen and move soil and rock downhill or downwind. Umm...for example, imagine you are having ice cream in your hand out on a sunny day, if the ice-cream melts and falls down, it is called erosion and if the ice-cream melts but it doesn't fall down, it called weathering.
How does heat transfer by radiation different from the heat transfer by conduction or convection
The major difference between heat transfer by conduction and convection and heat transfer by radiation is that heat transfer by conduction and radiation requires a material medium, while heat transfer by radiation is done by electromagnetic waves and doesn't require a medium.
Heat or thermal energy is the energy generated when atoms or molecules move in a variety of directions (translational, rotational and vibrational). The three methods of heat transfer are convection, conduction and radiation. Conduction only occurs between solid objects in contact, convection occurs within a fluid, and radiation occurs through electromagnetic waves.
Unlike conduction and convection, radiation doesn't require a material medium before heat is transferred, as electromagnetic radiations don't require a material medium to propagate. Heat is transferred by radiation through infrared rays. Other differences include:
Conduction and convection are slow, while radiation is fast, as infrared rays travel at the speed of light.Radiation can be reflected using mirrors, while conduction and convection cannot.Learn more about radiation here:
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A substance dissolved in a liquid is a
solution
evaporation
vein
geode
A force that opposes or has resistance to motion.
Which is the best description of a molecule?
A molecule of an element is composed of at least two types of atoms.
A molecule of a compound is composed of only one type of atom.
A molecule of a compound is composed of at least two types of atoms.
A molecule of an element is composed of exactly two types of atoms.
Answer:
The third option "A molecule of a compound is composed of at least two types of atoms" is correct
Explanation:
This question isn't about molecules, it's about elements and compounds.
Elements are made of one and only one type of atoms, while compounds are made of more than one type of atoms.
(Molecules are just groups of atoms, it doesn't matter what they're made of)
Answer:
a
Explanation:
what is a coefficient
Answer:
In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables.
Explanation:
What is the name of CF7
Answer:
Formula mass in daltons of the chemical component.
Why is it important for us to study isotopes?
Answer:
it is useful in diagnostics and treatment applications
Which statement best describes how temperature, humidity, and pressure vary within an air mass?
Calculate the molar mass of a gas with a mass of 3.15 g, a pressure of 785 mmHg, and a temperature of 20 Celsius. The gas has a volume of 750 ml.
Answer:
Molar mass = 105 g/mol
Explanation:
Given data:
Mass of gas = 3.15 g
Pressure = 785 mmHg
Temperature = 20°C
Volume of gas = 750 mL
Molar mass of gas = ?
Solution:
Pressure = 785 mmHg (785/760 = 1 atm)
Temperature = 20°C (20+273 = 293 K)
Volume of gas = 750 mL (750 mL× 1 L/1000 mL = 0.75 L)
PV = nRT
R = general gas constant (0.0821 atm.L/mol.K)
1 atm× 0.75 L = n×0.0821 atm.L/mol.K × 293 K)
0.75 atm.L = n× 24.06 atm.L/mol
n = 0.75 atm.L / 24.06 atm.L/mol
n = 0.03 mol
Molar mass of gas:
Molar mass = Mass / number of moles
Molar mass = 3.15 g/ 0.03 mol
Molar mass = 105 g/mol
Which of these is an example of a description of
speed?
An airplane traveled west from New York to Los
Angeles.
A train traveled east at 200 mph from Albuquerque to
Dallas.
The average Olympic sprinter runs 8 m/s.
An apple fell from the tree and then rolled 1 m north.
Answer:
The average Olympic sprinter runs 8 m/s.
Explanation:
Speed is defined as the change of an object from one position to another position with respect to the time taken. It is independent of direction and only depends on the change of its position.
In the context, all the other sentences has direction mentioned in the sentence except the sentence "the average Olympic sprinter runs 8 m/s". In this sentence, the speed of an Olympic sprinter id given i.e. 8 meter per second.
What is the relationship between the kinetic energy of an object and the mass of an object? Assume the speed is constant.
A. Kinetic energy gets bigger at the same rate as the mass of an object.
B. Kinetic energy gets bigger at a faster rate than the increase of a mass of an object.
C. Kinetic energy decreases as the mass of an object increases.
D. Kinetic energy decreases at a faster rate than the increase of a mass of an object
Answer:
A
Explanation:
kinetic and mass are directly proportional
so if one increases the other does to
The relationship between the kinetic energy of an object and the mass of an object is Kinetic energy gets bigger at the same rate as the mass of an object.
What is kinetic energy ?The energy that an object has as a result of motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body keeps the kinetic energy it acquired throughout its acceleration unless its speed changes.
Potential energy can be moved into motion by a variety of catalysts, including gravity and chemical reactions, to release kinetic energy. As a result, kinetic energy rises and potential energy falls. Mechanical energy is the sum of all kinetic and potential energy.
The capacity to perform work is arguably the most significant characteristic of kinetic energy. Force acting on an object while it is moving is referred to as work. Energy and work are interchangeable because of their tight relationship.
Thus, option A is correct.
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Question 9
Which of the following would have the highest mass?
A
0.75 mol CO3(PO4)2
B
1.2 mol Fel2
С
10 mol CH3C1
D
17.5 mol Cl2
Answer:
Answer: A. 3 mol 3 mol Al:
Explanation:
Te given balanced chemical equation is :
According to the stochiometry :
A: 3 mol 3 mol Al:
3 moles of chlorine reacts with 2 moles of aluminium
B. 2 mol 3 mol :
2 moles of aluminium reacts with 3 moles of chlorine
C. 2 mol 2 mol Al
2 mol of aluminium produces 2 mol of
D. 3 mol 2 mol
3 moles of chlorine produces with 2 moles of
Thus the conversion factor not used for mole to mole calculations is 3 mol 3 mol Al:
Explanation:
Na and Hydroxide formula
Answer:
I'm pretty sure it's NaOH
Explanation:
I hope this helps :D
The electrostatic potential of atoms in a molecule is not a visual representation of the atom's potential to attract or repel a
A.) electron
B.) neutron
C.) proton
D.) quark
Answer:
C proton hope it helps <3
Explanation:
MULTIPLE CHOICE
True or False: Any metal object that contains iron,
such as steel, will be attracted to a magnet.
Answer:
TRUE
Explanation:
How many grams are there in 7.5E10 atoms of tungsten (W)?
Answer:
1 mole is equal to 1 moles Tungsten, or 183.84 grams. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles Tungsten and gram.
Explanation: