Explanation:
Molality of a solution is the number of moles of solute dissolved in 1 Kg of the solvent. Thus, if one gram molecule of a solute is present in 1 kg of the solvent.
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what is the symbol of the periodic table for aluminum
Answer:
Al
Explanation:
Al = Aluminum
I WILL GIVE BRAINLEST !! I WILL GIVE BRAINLEST !!!!
For the complete redox reactions given, identify the oxidizing and reducing agents.
2Sr + O2 --> 2SrO
Answer:
OIL o RIG sr
2Sr will be oxidation because it'll loses (2) electrons to O2. So, oxidised to form 2SrO
O2 will be reduction because it'll gain (2) electrons from Sr
Sr is oxidised. Thus, reducing agent because it causes O2 to be reduced.
O2 is reduced. Thus, the oxidising agent because it causes Sr to be oxidised.
Reducing agent = Sr
Oxidising agent = O2
Hope this helps!
2 Explain why the reaction between aluminum and iron oxide is useful in the railway industry.
Answer:
Sometimes, it is necessary to produce a small amount of iron more quickly, for example if railway workers need to produce molten metal to fix a broken rail.
Explanation:
The thermite reaction uses aluminium powder and iron (III) oxide. When ignited, the mixture reacts vigorously because of the large difference in reactivity between aluminium and iron.
The aluminum can create more durable bonds with oxygen than it can with hydrogen. Since a lot of heat is produced throughout the entire reaction, molten iron that may be used to link railroad tracks is produced as a result of the reaction.
What is aluminum ?Chemical element aluminum has the atomic number 13 and the symbol Al. Aluminum has a density that is around one third that of steel, which is lower than that of most common metals. It has a strong affinity for oxygen, and when exposed to air, creates a protective oxide coating on the surface.
Aluminum (Al) and iron(III) oxide (Fe2O3) react to generate aluminum oxide (Al2O3) and molten iron (Fe). Aluminum displaces iron in iron(III)oxide to generate aluminum oxide in what is known as a displacement reaction.
Iron oxide and aluminum are used to repair machine parts that have cracks or serve as railing on railroad tracks. Thermite reaction is the name given to this process.
Thus, The aluminum can create more durable bonds with oxygen than it can with hydrogen.
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38. Assuming a sample mixture made from sand and sugar had a mass of 53.5 g, and
it was separated using decantation and boiling to remove the water used in the
separation procedure, what is the mass percent of sugar in the sample assuming 35.2
g of sugar was recovered, and 16.0 g of sand was recovered?
A.66%sugar
B.4%sugar
C.30%sugar
39. Using the information from question 38 what is the total percent recovery for the separation? Is the percent recovery greater than less than 100% why might this be the case?
The Mass percent of sugar in the sample was 66% while the Total percent recovery is 95.7%
Equation
An equation is an expression used to show the relationship between two or more variables and numbers.
Given the sample had a mass of 53.5g, hence:
Mass percent of sugar in the sample = (35.2/53.5) * 100% = 66%
Total percent recovery = [(35.2 + 16)/ 53.5] * 100% = 95.7%
The Mass percent of sugar in the sample was 66% while the Total percent recovery is 95.7%
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Why does metal expand when heated?
Answer:
Metal expands when heated. Length, surface area and volume will increase with temperature. ... Thermal expansion occurs because heat increases the vibrations of the atoms in the metal
Explanation:
hope this help :)
Answer:
Length, surface area and volume will increase with temperature.
Explanation:
Metal expands when heated. Length, surface area and volume will increase with temperature. ... Thermal expansion occurs because heat increases the vibrations of the atoms in the metal
What is the difference between heavy cream and heavy whipping cream?.
Answer: The main difference between the two is their fat content. Heavy cream has slightly more fat than whipping cream. Otherwise, they are nutritionally very similar. You can use them interchangeably in recipes without affecting the taste, although they may lead to different consistencies.
Explanation:
Delaney is putting together a motor for her
science project. She needs a material that
conducts electricity for the circuits and a
material that does not conduct electricity for insulators
Answer:
40. B
41. B
Explanation:
Copper is a good insulator and conducts electricity.
Which consumers are cornivores
Answer:
Carnivores and omnivores are secondary consumers. Many carnivores eat herbivores. Some eat omnivores, and some eat other carnivores. Carnivores that consume other carnivores are called tertiary consumers.
E.g
Felines, ranging from domestic cats to lions, tigers, and other large predators.
Some canines, such as the Gray Wolf
Hyenas.
ferrets.
Polar Bears.
Pinnipeds ( seals, sea lions, walruses, etc.)
Birds of prey, including hawks, eagles, falcons, and owls.
Chemical bonds __________.
a. take a long time to break.
b. are energy relationships between the electrons of the reacting atoms.
c. are energy relationships between the protons of the reacting atoms.
d. are physical structures that hold atoms together.
Answer:
c. are energy relationships between the protons of the reacting atoms.
Explanation:
Calculate the mass of 3.00 moles of SeBr2
Power gathered from the sun and wind?
A
is considered a nonrenewable resource.
B
can provide humans with energy forever.
C
can only be used in the daytime.
D
is not a natural resource.
30 points
Your answer is B
Sun and wind are considered renewable energy, meaning that it won't polute the Earth. And as far as I know, the Sun and wind can't really run out. So it can last a very long time!
Hope this helps!
-Daisuke
What type of bond holds the complementary bases together?.
Answer:
hydrogen bonding
Explanation:
The two strands of DNA are held together by hydrogen bonds between complimentary nucleotides.
A force of 50 N displaces an object by a distance of 80 cm. Calculate the work
done.
Answer:
40 J
Explanation:
W= Fd = 50*0.8 = 40 J
80 cm = 0.8 m
Is melting an ice cube a physical or chemical change.
what effect does dilute ethanoic acid have on red litmus paper
Answer:
As ethanoic acid is basically a acid
it will turn blue litmus red and on a red litmus paper
there will be no effect
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What is the correct skeleton equation for the following reaction?
iron + oxygen --> iron(III) oxide
Fe +O—> FeO
Fe + O2 —> FeO2
Fe+ O2 —> Fe₂O₃
Fe + O —> Fe₂O₃
Fe +O2 =Fe2O3 is correct !
Molecules at a higher temperature have _______ kinetic energy, speed, and momentum compared to molecules at a lower temperature.
Answer:
Molecules at a higher temperature have higher/more kinetic energy, speed, and momentum compared to molecules at a lower temperature.
Explanation:
True or False: Increasing the amplitude
changes the wavelength.
Answer:
False
Explanation:
Amplitude does not affect wavelength
How to Separate Iodine and sulfur by technique of saparation
A mixture of iodine and sulphur can be separated by adding Carbon disulphide that is (CS₂) then stir the solution and filter it . As sulphur dissolved in CS₂, so it come into filter and got separated from the mixture.
What force in liquids causes surface tension? covalent forces intermolecular forces intramolecular forces ionic forces.
Answer:
Intermolecular forces
Explanation:
Intermolecular forces cause surface tension.
Source info:
"Surface tension, capillary action, and viscosity are unique properties of liquids that depend on the nature of intermolecular interactions."
(11.S: Liquids and Intermolecular Forces (Summary)https://chem.libretexts.org )
Surface tension is said to be the result of the attraction between the particles present on the surface layer of the liquid matter. It is caused by intermolecular interactions. Thus, option b is correct.
What are intermolecular forces?Intermolecular interactions are the forces that are said to be secondary forces and allow the molecules to bond and interact together by the attractive and repulsive forces between the ions and the atoms.
The hydrogen bonds, ion-dipole, dipole-dipole, and dispersion forces are intermolecular interactions. They are not within but in between the molecules. They give rise to the surface tension in liquids that act cohesive and bind the various molecules in liquid together.
Therefore, option b. the intermolecular forces cause surface tension in liquids.
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Which of the following adaptations does NOT help animals survive in areas covered with snow?
a thick fur to keep the body warm
a thick layer of fat that insulates the body
a dark-colored fur to catch their prey
a white-colored fur to hide from predators
Answer:
a dark-colored fur to catch their prey
Explanation:
In areas covered with snow, the temperatures are too low. Therefore, animals surviving in these areas require thick fur or body insulation to ensure their body temperature is regulated. The snow is white in color and therefore, being white in color helps the animals camouflage hence not visible to the predators.
Having a dark color, this will only expose these animals to their predators since the areas are covered with white snow. They will be easily traced by their predators and maybe selected out by nature.
I need help with this whoever helps will get a surprise
Answer:
wish it helps anything else comment at my answer
calculate
the grams in 1.75 moles of H2SO4 and
round to the correct sig figs
Answer:
171.63734
Explanation:
Used a calculator lol
Does Jarren love Maria more or does Maria love Jarren more?
(Not for school)
Answer:
Maria
Explanation:
Answer:
Maria loves Jarren more is the answer.
Helped by QueenTlove Have an nice day
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What is the volume, in liters, of
1.50 mol Cl, at STP?
STP signifies standard temperature and pressure. These conditions are at 1 atmospheric pressure and 0 degrees Celsus, It has been said that at these conditions, one mole of a gas molecule is 22.4 liters of volume.
1.50 mol Cl2( 22.4 L / mol) = 33.6 L Cl2
can someone help me with this page? This is the first one I have to get done and I need the rhythm and ability do the other two
Answer: yeah it’s just a picture with it filled out ♀️
Explanation:
What is the difference between Speed and Velocity?
Which statement about Niels Bohr’s atomic model is true?
Answer:
I believe your answer is B. Each orbit has a specific energy level.
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how many moles of AI are necessary to produce 5.92 miles of hydrogen gas
Answer:
ok
Explanation:
why I needed to give a answer to a question. I want to ask the question. brainly solve this issue. i cant ask questions without answering to 1 questions.