Answer:
B
Explanation:
Option B best describes covalent bonds.
Aluminium reacts with sulfuric acid to form aluminium sulfate and hydrogen. What is the volume of
hydrogen gas in liters (L) produced at 300 K and 1.0 atm pressure, when 5.4 g of aluminium and
50.0 mL of 5.0 M sulfuric acid are combined for the reaction?
Answer:
[tex]2al + 3h2so4 = > al2(so4)3 + 3h2 \\ eqvt \\ = > \frac{5.4}{27} = > \frac{5 \times 50}{1000} \\ .2 \: mol = > .25 \: mol \\ \\ so \: .25 \: is \: limiting \: reagent \\ according \: to \: ideal \: gas \: equation \\ pv = nrt \\ v = \frac{nrt}{p} \\ v = \frac{.25 \times .082 \times 300}{1} \\ = \frac{1}{4} \times 8.2 \times 3 \\ = 2.05 \times 3 \\ = 6.15litre \\ thank \: you[/tex]
I need help solving the picture
Answer:
213 kJ-1704 kJ852 kJ (ignore what's on my paper, accidentally added a negative)Explanation:
These problems are pretty easy, you just need to do to the enthalpy what is done to the equation itself. Numbers one and 3 are reversed, so they become positive values. When a coefficient changes in the equation, you multiply the enthalpy by that number. I have attached my work below. Let me know if there is any confusion left.
Hope this helped! :^)
What is the concentration of chloride ions in solution after the reaction of 5.8 mL 0.12 M ammonium chloride with 3.2 mL 0.21 M silver nitrate
Answer:
ok
Explanation:
A student performs titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant. How will his experimental error affect the calculated value for the concentration of unknown acetic acid
Answer:
A student performed titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant.
Explanation:
hope it helps you
The metallic character of an element is defined as the properties typical of a metal, especially the tendency to lose electrons in chemical reactions.
Arrange the following elements in order of decreasing metallic character.
P, Zn, Cr, Cs, F, S, Ca
Rank from most to least metallic character. To rank items as equivalent, overlap them.
Answer:
Rb, Zn, P, S, F, Ca, Co, Cr
Rb, Zn, P, S, F, Ca, Co, Cr elements in order of decreasing metallic character.
What is a metallic character?The metallic character of an element is defined as the properties typical of metal, especially the tendency to lose electrons in chemical reactions.
Metallic character depends on the ability of an element to lose its outer valence electrons. Examples of properties related to metallic character include thermal and electrical conductivity, metallic lustre, hardness, ductility, and malleability. The most "metallic" element is francium, followed by caesium.
Hence, Rb, Zn, P, S, F, Ca, Co, and Cr elements in order of decreasing metallic character.
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A 1.8 mole sample of a compound weighs 195 g and is found to be 11.18% H and 88.82% C. What is the molecular formula for the compound?
Answer:
C8H12
Explanation:
First find the molar mass
195/1.8 × 1 = 108.3 gmol-1
Then the molecular formula
Mass of C in 1 mole of compound = 88.82×108.3/100
= 96.2 g
Mass of H in 1 mol of.the compound = 108.3×11.18/100 = 12.11 g
Divide the mass by their molar masses to get no. of moles in 108.3 g of compound or 1 mole of compound
Moles of C in one Mole of compound = 96.2g/12 gmol-1 = 8 mol
Moles of H in 1 mole of compound = 12.11g/1 gmol-1 =12 mol
Since we need the molecular formula it's C8H12
plz help someone thx
Answer:
Glycerin
Explanation:
The stronger the intermolecular forces of attraction the more energy is required to break those forces, if you need more energy to break these forces it means that these certain elements would have a higher boiling point. Which is why the answer is Glycerin, the highest boiling point of an element means that it has the strongest forces, which in this case is electrostatic forces.
Answer:
Glycerin
Explanation:
The content of ethanol or alcohol for alcoholic beverage is measured with alcohol proof. A 750 mL bottle of vodka is labeled as 60 proof. What is its alcohol content?
The alcohol content is 450 proof
In the given example, the measurement of the alcohol content is said to be measured in alcohol proof.
If the volume of the vodka = 750 mLWe are going to multiply the given proof of the alcohol with the vodka drink divided by 100 to determine the content of alcohol in the alcoholic beverage.
i.e.
= (750 × 60)/100 proof
= 450 proof
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375cm3 of a gas has a pressure of 770 mm Hg, find it Volume if the pressure is reduced to 750 mm Hg
Answer:
385 cm^3
Explanation:
375cm3 of a gas has a pressure of 770 mm Hg, find it Volume if the pressure is reduced to 750 mm Hg
if we reduce the pressure, the volume increase since since PV is constant
so the new volume = 0.375 cm^3 X 770/750 = 385 cm^3
63
plsss anwer my questions in the picture
Answer:
17) b
18) c
19) c
20) c
21) b
22) D
23) b
24) b
25) a
26)?
27) D
28) b
29) D
30) c
help me. correct answer will be marked as brnlst
Answer:
You are correct it is NaCl
What is the wavelength of a photon that will be emitted when an electron in the hydrogen atom moves from n
Answer:
Use the Rydberg Equation 1/λ = R(1/n²(final) - 1/n²(initial) where R = 109,678 cm⁻¹. Substitute initial orbital number and final orbital number and solve for wavelength (λ).
Explanation:
Example:
Assume an electron transition from n = 5 to n = 2.
1/λ = 109,678cm⁻¹(1/2² - 1/5²) = 109,678(0.25 - 0.04)cm⁻¹ = 23,032cm⁻¹
λ = 1/23,032cm⁻¹ = 4.34 x 10⁻⁵cm x 10⁻²m/cm x 10⁹nm/m = 434nm
1.25 is the closest to 1.04 or not I want to answer please. I think it's true, but I want to prove it scientifically, please.
Answer:
false because if you round both of them
14. What type of materials are spun together to make yarns?
Answer:
cotton
Explanation:
which is typically spun into fine yarn for mechanical weaving or knitting into cloth.
When comparing an electron's ground state with that of its excited state; which is the
higher entropy and which is the lower entropy? Provide a brief explanation as to why?
HINT: Remember the relationship of the electron to its nucleus!
When comparing an electron's ground state with that of its excited state;
The higher entropy is at its excited state.The lower entropy is at its ground state.Discussion:
Entropy is simply defined as the degree of randomness otherwise termed disorderliness in a system.
Electrons in their ground state are localized and have lower energy. As such, the entropy is lower.
On the contrary; Electrons in their excited state are delocalized and have higher energy. As such, the entropy is higher.
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Which of the following do not have angular momentum? Choose all that apply: O A. A spinning planet O B. A boy sleeping in bed O C. A ball sitting in a garbage can O D. A Ferris wheel in motion
Answer:
The answer is A and B
Explanation:
Do you think sugar would be soluble in hexane based on its structure
Answer:
The dipole forces (particularly H-bonds) that keep polar solute molecules together can be replaced by polar solute-solvent interactions, so substances that are predominantly polar (like glucose) dissolve in polar solvents like water but not in nonpolar solvents like hexane (H-bonds).
Explanation:
Which of the following has the greatest number of groups or branches?
A hexane
B. 3-ethylhexane
C. 2,3-dimethylpentane
D. 2-methylheptane
*correct answers only*
Answer:
C
Explanation:
Option C should be the correct one, since you have two methyl groups in the alkane (parent) chain.
NEED ANSWER ASAP!! will give brainlist
Which best explains why nanofiltration is an important new technology?
A. It can be used to help regions that have a short supply of usable water.
B. It can be used as an energy source to produce electricity in regions with limited coal.
C. It recycles wastewater to be reused for geothermal energy.
D. It collects solar energy to generate electrical power.
Explanation:
Our Direct Nanofiltration (dNF) membranes offer the unique combination of a low fouling hollow fiber configuration with the ability to remove organics and salinity (hardness) from water in one simple step. Other than a strainer, no further pre-treatment is required. We manufacture our membranes with a patented layer-by-layer process, where multiple nano-scale layers are deposited on a membrane support. This method enables very precise and controlled rejection and flux properties of the membrane. A unique solution for troubled water.
A sample of hydrogen sulfide, H2S, has a mass of 13.7513.75 g. Calculate the number of hydrogen sulfide molecules in the sample
Answer: 2.43 x 10^23 molecules
Explanation:
Molar mass of H2S: 2(1.008) + 32.06 = 34.1 g/mole
Avogadro’s number for converting moles to atoms or molecules: 6.02 x 10^23
(13.751375g H2S)(1 mole H2S)(6.02x10^23 molecules) / (34.1g/mole H2S)(1mole H2S) = 2.43 x 10^23 molecules H2S
what is the best way to learn and understand high school chemstry?
Answer:
Firstly, try to Go through your chapter and pay attention to main keywords.
secondly try to watch 'Uube' videos related to specific topic instead of chapter and pay attention to it closely and watch it with a keen interest.
Discuss topics that you find harder with your friends or peer group members, Because you learn faster when you study with the people of your age.
Answer:
i think the best way to learn chemistry is study over things that involve it
Explanation:
plss anwer my question
brainliest for who answers my questions
Answer:
13.C
14.B
15.C
16.Chemical element
Chemical Element are called substance or element that cannot be decomposed or broken down into simpler substances by ordinary chemical process.
Chemical elements are those elements which cannot be chemically broken down into simpler substances and are primary constituents of all matter. They are fundamental ingredients of all matter in existence which can be combined in reaction to create chemical substance each chemical element in the universe has unique properties that distinguish it from all of the Other chemical elements. For example hydrogen is an element.
Hope that helps
1 question hurry as fast as possible no link
Answer: ELEMENT
Explanation:
Temperature is a measure of ___________
A: Heat Energy
B: Potential Energy
C: Climate
D: Kinetic Energy
Answer:
D: Kinetic Energy
Explanation:
Temperature is a measure of kinetic energy. Temperature is a measure of the average kinetic energy of the particles in an object. When temperature increases, the motion of these particles also increases.
Hope this helps :)
What type of substance is magnesium carbonate?
Answer:
MgCO 3 is an inorganic salt with chemical name Magnesium Carbonate. It is also called Magnesite or Hydromagnesite or Barringtonite. Hydrated forms of magnesite such as di, tri, tetrahydrates are present as minerals. It acts as a fertilizer and as an antacid.
Think about the parts of an egg, and write down why you think it can act as a model of an animal cell. Also write down your predictions of what will happen when you leave an egg in vinegar for three days.
Answer:
Explanation:
Determine the treatments you’ll be using on your eggs, and prepare the substances you’ll need. You can make salt-water solutions by dissolving different amounts of table salt in containers of water (e.g. 100g, 200g, 300g of salt (NaCl) per liter). You can make solutions of food coloring by adding a few drops of each color into containers of
The Eggsperiment with Vinegar solution. The first experiment conducted was the egg placed in vinegar solution which allowed the egg to become soft and bouncy . Vinegar is a weak acid which is 5% acetic acid in water (meaning vinegar is largely just water). The egg has a shell that is made up of calcium carbonate an air cell forms at the large end of the egg. While the embryo is growing, the shell membranes surround and contain the white or albumen of the egg. The albumen provides the liquid medium in which the embryo develops, and it also contains a large amount of the protein necessary for proper development. I hope this was hopeful
One mole of what substance contains a total of 6.02x10^23
Answer:
oxygen
Explanation:
One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.
help! giving brainliest
perdon no se es que es para que me dé ingreso
A piece of potato had an original mass of 3.2g and after being left in a sugar solution for 24 hours it then had a mass of 2.8g. Calculate the percentage mass decrease of the potato.
Answer: -13% to 3 sig figs
Explanation:
A piece of potato had an original mass of 3.2g and after being left in a sugar solution for 24 hours it then had a mass of 2.8g. Calculate the percentage mass decrease of the potato.
the change in mass is 2.8 -3.2 = -0.4 gm
the % change fro the origial piece is ( -0.4/3.2) X 100 = -12.5%
or -13% to 3 sig figs
identify key concept/terminologies about solution or concentration of solution?
pls help me
thanks~
Answer :
[tex] \: [/tex]
Concentration of Solutions
Recall that a solution consists of two components: solute (the dissolved material) and solvent (the liquid in which the solute is dissolved). The amount of solute in a given amount of solution or solvent is known as the concentration. The two most common ways of expressing concentration are molarity and molality.
Molarity
The molar concentration (M) of a solution is defined as the number of moles of solute (n) per liter of solution (i.e, the volume, V solution):
M = n / V solution
The units of molarity are mol/L, often abbreviated as M.
For example, the number of moles of NaCl in 0.123L of a 1.00M solution of NaCl can be calculated as follows:
[tex]0.123 \: l \: \: of \: solution \: \times \: \frac{1.00 \: mole}{1.00 \: l \: of \: solution \: } \: \\ = 0.123 \: moles[/tex]
Molality :
The molal concentration (m) of a solution is defined as the number of moles of solute (n) per kilogram of solvent (i.e., the mass of the solvent, msolvent):
[tex]m = \frac{n}{v \: solution} [/tex]
For example, the number of moles of NaCl dissolved in 0.123kg of H2O (the solvent), in order to make a 1.00m solution of NaCl, can be calculated as follows:
[tex]0.123 \: kg \: of \: solvent \: = \frac{1.00 \: mole}{1.00 \: kg \: of \: solvent \: } \\ = 0.123 \: moles[/tex]