Salt lowers the freezing point of water by interfering with the intermolecular forces of the water molecules, allowing for less interactions between water molecules.
What is freezing point?The Freezing point is the temperature of a liquid at which it changes its state from liquid to solid at atmospheric pressure.
Salt molecules block water molecules from packing together when temperature is lowered. It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase. Freezing point depression occurs when the freezing point of the liquid is lowered by addition of solute.
Hence, option B is correct.
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Please help me answer this question
Answer with explanation:
1) general word equation=acid + metal= salt + hydrogen gas
chemical/balanced equation= 2HCl+Mg=MgCl2+H2
2)The gas thus formed is an effervescent carbon di oxide when calcium chloride reacts with hydrochloric acid. the carbon di oxide gas also acts as an extinguisher for fires. Hence the burning candle is extinguished.
What are the differences of a physical change and a chemical change?
Answer:
a physical change only changes the look of something whereas a chemical change occurs when one thing has a reaction and it forms a new substance.
Which among the following represents a set of isotopes? Atomic nuclei containing:
a) 20 protons and 20 neutrons
b) 21 protons and 19 neutrons
c) 22 neutrons and 18 protons
d) 20 protons and 22 neutrons
e) 21 protons and 20 neutrons
Answer:
d. 20 protons and 22 neutrons
Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.
What is an electron?
An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Therefore, Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.
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Why does iodine have a lower average atomic mass that tellurium? Can you find other examples of this in the periodic table?
How does the mass of each atom compare to the average atomic mass of the element give in the periodic table?
Explanation:
One is the average weight of an element and the other is the total number of nucleons in the atom's nucleus. Atomic mass is also known as atomic weight. Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes please mark as a brainliest
At what temperature does water boil if 75.0 g of glucose (180.1 g/mol) is added to 400 g of water?
A. 100.25 degree C
B. 100.53degree C
C. 100.84degree C
D. 101.39degree C
E. 101.94degree C
Answer:
A
Explanation:
Because it have more glucose
At 100.25 degree C temperature does water boil if 75.0 g of glucose (180.1 g/mol) is added to 400 g of water. Hence option A is correct.
What is temperature?Temperature is defined as the measuring a substance's degree of heat or cold. The direction of heat transfer when two bodies with different temperatures are kept in touch depends on the temperature. An instrument that measures temperature is a thermometer.
Glucose is defined as one of the carbohydrates classified as simple sugars. The brain is the most energy-hungry organ in the body and uses half of the body's sugar energy due to its abundance of nerve cells, or neurons. Thinking, memory, and learning are all tightly correlated with blood glucose levels and how effectively the brain uses this fuel.
Thus, at 100.25 degree C temperature does water boil if 75.0 g of glucose (180.1 g/mol) is added to 400 g of water. Hence option A is correct.
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Draw the structure 2,3dimethylhep-2-ol
Answer:
[tex]{ \sf{CH_{3}C - (CH_{3})(OH)CH(CH_{3})CH_{2} CH_{2} CH_{2}CH_{3}}}[/tex]
A chunk of copper has a volume of 20.0 mL. What is its mass?
The mass of the chunk of copper is 179.2g
WHAT IS DENSITY:
Density of an object refers to its mass in relation to its volume i.e. density can be calculated by dividing the mass of an object by its volume. This means that if the density of an element or substance is known, the mass can be calculated in a given volume.The density of Copper element is 8.96g/mL
Since density = mass (g) ÷ volume (mL)
8.96 = mass ÷ 20mL
mass = 20 × 8.96
mass = 179.2g
Therefore, the mass of the chunk of copper is 179.2g
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Which of the following words means "the degree to which a measurement is precise and reliable"?
a. variable
b. accuracy
c. parameter
d. constant
9. Hydrogen is 99% H, 0.8% ?H, and 0.2% H. Calculate its average atomic mass.
Answer: Technically, this cannot be answered, since none of the H atoms have a mass number assigned. With the assumption noted delow, I calculate 1.012 as the average atomic mass.
Explanation:
My answer is based on assumed masses for the three H isotopes:
1H : 1 AMU
2H: 2 AMU Deuterium
3H: 3AMU Tritium
AMU Rel Abund. Wt. Avg
1H 1 99.00% 0.99
2H 2 0.80% 0.016
3H 3 0.20% 0.006
Sum 1.012
Câu 15: Khử hỗn hợp X gồm CuO, FeO bằng khí CO sau một thời gian thu được 14,4 gam hỗn hợp rắn A (4 chất) và thoát ra 3,36 lít (đktc) khí B có tỷ khối so với H2 bằng 18. Hòa tan hoàn toàn A trong dung dịch H2SO4 đặc, nóng dư đến khi phản ứng kết thúc thu được 2,24 lít SO2 (đktc) và dung dịch B. a) Viết các phương trình phản ứng. b) Tính khối lượng mỗi oxit FeO, CuO trong hỗn hợp đầu. c) Cô cạn dung dịch B thu được bao nhiêu gam muối khan.
Answer:
Cô cạn dung dịch B thu được bao nhiêu gam muối khan.
Which is an example of a three
dimensional measurement of
volume?
A. 120 cubic meters
B. 120 grams
C. 120 miles per hour
D. 120 units
Answer:
It's A. 120 cubic meters
Explain why arginine is a basic amino acid
Answer:
There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.
Hope it helps you.Answer :
arginine is basic amino acid because it's side chain group contains a full positive charge at the physiological pH. Histidine is also considered basic but it can have a positive or a neutral charge on its side chain group at the physiological pH
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What is sulfuric acid? Briefly
Answer:
Sulfuric acid or sulphuric acid, also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with the molecular formula H₂SO₄. It is a colorless, odorless and viscous liquid that is miscible with water.
Explanation:
Explanation:
Sulfuric acid is a colourless oily liquid. It is soluble in water with release of heat. It is corrosive to metals and tissue. The major use of sulfuric acid is in the production of fertilizers . Sulfuric acid, sulfuric also spelled sulfuric (H2so4) , also called oil of vitrod. Sulfuric acid is a very important commodity chemical , and a nation's sulfuric acid production is a good indicator of it's industrial strength.
Solve the following equation for
x. 4x+6=-10
[tex]\\ \sf\longmapsto 4x+6=-10[/tex]
[tex]\\ \sf\longmapsto 4x=-10-6[/tex]
[tex]\\ \sf\longmapsto 4x=-16[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{-16}{4}[/tex]
[tex]\\ \sf\longmapsto x=-4[/tex]
4x + 6 = - 10
4x = -10-6
4x = -16
x = -16/4
× = -4
8. What is the chemical formula for sulfuric acid? Explain in great detail.
The chemical formula for sulfuric acid is H2SO4.
Detailed explanation:
This means that there are 2 atoms of hydrogen, 1 atom of sulfur, and 4 atoms of oxygen in a single molecule. Hope this helps!
The answer is H2SO4.
A student titrated a solution containing 3.7066 g of an unknown Diprotic acid to the end point using 28.94 ml of 0.3021 M KOH solution. What is the molar mass of the unknown acid? Hint: you must write a balanced equation for the reaction.
Answer:
Molar mass of the diprotic acid is 424 grams
Explanation:
[hint: diprotic acid only contains 2 hydrogen protons]
Ionic equation:
[tex]{ \bf{2OH { }^{ - } _{(aq)} + 2H { }^{ + } _{(aq)}→ 2H _{2} O _{(l)} }}[/tex]
first, we get moles of potassium hydroxide in 28.94 ml :
[tex]{ \sf{1 \: l \: of \: KOH \: contains \: 0.3021 \: moles}} \\ { \sf{0.02894 \: l \: of \: KOH \: contain \: (0.02894 \times 0.3021) \: moles}} \\ { \underline{ = 0.008743 \: moles}}[/tex]
since mole ratio of diprotic acid : base is 2 : 2, moles are the same.
Therefore, moles of acid that reacted are 0.008743 moles.
[tex]{ \sf{0.008743 \: moles \: of \: acid \: weigh \: 3.7066 \: g}} \\ { \sf{1 \: mole \: of \: acid \: weighs \: ( \frac{1 \times 3.7066}{0.008743}) \: g }} \\ = { \underline{423.95 \: g \approx424 \: grams}}[/tex]
for the molar mass:
a mixture , the different parts of which vary in composition and properties
Answer:
heterogeneous mixture
Explanation:
(a) A mixture with the same composition and properties throughout is called a homogeneous mixture. (b) A mixture, the different parts of which vary in composition and properties, is called a heterogeneous mixture.
Which type of model best represents crystals?
A. ribbon
B. space-fill
C. ball-and-stick
D. Lewis dot
A space filling model is a representation in which atoms of a compound appear as spheres of equal diameter. Crystals are best represented using space filling model.
Crystals are composed of atoms or molecules of a substance that are arranged in a regular and repeating pattern.
While ball and stick models offer an effective representation for discrete molecules, a space filling model is more apt for a crystal since the components are repeating at regular intervals.
Hence the correct answer is option B: space-fill. The space filling model of sodium chloride crystal is shown in the image attached.
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Calculate with correct number of significant figures: 685.90 + 152.1 - 0.125
Answer:
837.9
Explanation:
aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 344 mL
Answer:
[tex]\boxed {\boxed {\sf 928.8 \ grams}}[/tex]
Explanation:
Density is the mass per unit volume of a substance. The following formula is used for calculating density.
[tex]\rho= \frac{m}{v}[/tex]
We know the density of aluminum is 2.70 grams per milliliter. The mass is unknown, but we know the piece of aluminum has a volume of 344 milliliters.
ρ= 2.70 g/mL v= 344 mLSubstitute these values into the formula.
[tex]2.70 \ g/mL = \frac {m}{344 \ mL}[/tex]
We are solving for the mass, so we must isolate the variable m. It is being divided by 344 milliliters. The inverse operation of division is multiplication. Multiply both sides of the equation by 344 mL.
[tex]344 \ mL *2.70 \ g/mL = \frac {m}{344 \ mL} * 344 \ mL[/tex]
[tex]344 \ mL *2.70 \ g/mL =m[/tex]
The units of milliliters cancel.
[tex]344 *2.70 \ g=m[/tex]
[tex]928.8 \ g =m[/tex]
The mass of the piece of aluminum is 928.8 grams.
What is light energy absorbed by?
Answer:
I think in the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom.
Hope this help you!:)
Which of the following is an example of a connection between the hydrosphere and the
lithosphere?
A.waves eroding rocks on the beach
B.water evaporating to form clouds
C.fish swimming in a river
D.boats transporting goods
Answer:For example, rain (hydrosphere) falls from clouds in the atmosphere to the lithosphere and forms streams and rivers that provide drinking water for wildlife and humans as well as water for plant growth (biosphere). River action erodes banks (lithosphere) and uproots plants (biosphere) on the riverbanks.
Explanation:b
We have that examples of a connection between the hydrosphere and the
lithosphere are
Water evaporating to form cloudsFish swimming in a riverOption A and B
The hydrosphere bears rain that falls in the atmosphere and creates water bodies on earth by combining with the lithosphere
Therefore
Water evaporating to form cloudsFish swimming in a riverAre examples of a connection between the hydrosphere and the
lithosphere.
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Have these points
Enjoy!
That's me btw lol
yay tysm :> you look pretty btw I hope you’re older the 18
Which option is an isotope with 6 protons and 8 neutrons?
A - carbon-14
B - oxygen-14
C - carbon-8
D - oxygen-6
Tell me the mass number of an atom with 4 protons, 5 neutrons, and 2 electrons.
Answer:
I'm pretty sure your answer will be 9
Answer:
9
Explanation:
Mass number = proton + neutron
= 4 + 5
= 9
How does getting funding from the government affect scientific research? A. The government helps the scientists decide what research is
important.
B. Scientists have to follow governmental rules made to protect
people.
C. The government tells the scientists what research they can do.
D. Scientists can only do research that helps the government protect
its citizens.
what we can seprate sand and iron flings
Answer:
Magnetic separation
Explanation:
Sand is non-magnetic whereas iron fillings can be used as magnets. So, they can be separated by a method which uses a magnet for separating a mixture. Magnetic separation is the process which uses magnetic force for the extraction of magnetic material from a mixture.
through magnet
although not writable answer but for gk even a blow of wind shall do
what type of orbital is occupied by an electron with the quantum numbers n=3, 1=2? How many degenerate orbital's of this type are found in a multi electron atom
The orbital is occupied by an electron with the quantum numbers n=3, l=2 will be 3d where n is orbit and l is band the d orbital have 5 degenerate orbitals.
What are orbit and orbitals?Orbitals are the well defined circular paths into which electron revolve around the nucleus in 2D mostly denoted by K L M N etc and all of them will be circular in the shape and non directional as well.
Orbitals are the 3D space of the nucleus where the probability of finding the electron will always be greater or maximum denoted by s p d and f and having shapes like s orbital is spherical shaped p orbital is in some other shape.
Therefore, orbital is occupied by an electron with the quantum numbers n=3, l=2 will be 3d where n is orbit and l is orbital and the d orbital have 5 degenerate orbital's.
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Chris wrote a few steps to describe how carbon circulates between the ground and living organisms
Step 1. Trees absorb carbon dioxide in the air and use it to make their own food using photosynthesis
Step 2. When plants or animals die, they are broken down by decomposers and their carbon returns to the soil
Step 3. Carbon stays in the ground for long-term storage as fossilized carbon
If step 1 is removed, which statement best describes the effects of this missing step on the carbon cycle?
More carbon is stored in the ground for long-term storage.
Less carbon is available for plant and animal growth
More carbon is stored in plants instead of the ground
There are more fossil fuels available for energy use
If Step 1 is missing, there will be less carbon available for both plant and animal growth.
Description of the process of photosynthesisThe steps written down by Chris to describe how carbon is circulates between the ground and living organisms form part of the carbon cycle.
In the first step which is photosynthesis, plants such as trees absorb carbon dioxide from the air and use it to make their own food.
Also the food made by plants during photosynthesis serve as a source of carbon for both the plants as well as animals and other organisms which depends on plants as their carbon source for growth.
ConclusionTherefore, if Step 1 is missing, there will be less carbon available for both plant and animal growth.
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Answer: B
Explanation: