Answer:
The answer to your question is A | Mn
The table below shows some information about four different elements.
Element
Classification
Density (g/cm³)
barium (Ba)
metal
3.6
beryllium (Be)
metal
1.8
chromium Cr)
metal
7.2
phosphorus P)
nonmetal
1.8
A cube of an unknown element has a shiny, silvery color. The side of the cube measures 2.0 cm and the cube has a mass of 14.56 g.
Based on the information in the table, which element makes up the cube?
Answer:beryllium
Explanation:
If the mass of a helicopter is 4500 kg and the net force on it is 18000 n, what is the helicopters acceleration
Answer:
The answer is
4 m/s²Explanation:
The force of an object can be found by using the formula
F = m × awhere
m is the mass
a is the acceleration
F is the force
Since we are finding the acceleration
[tex]a = \frac{F}{m} [/tex]
From the question
F = 18000 N
m = 4500 kg
Substitute the values into the above formula and solve
That's
[tex]a = \frac{18000}{4500} \\ = \frac{180}{45} [/tex]
We have the final answer as
4 m/s²Hope this helps you
Which element has a gas notation of [Kr]5s2 4d7
Calcium reacts with water to produce hydrogen and slightly soluble calcium
hydroxide, Ca(OH)2.
Ca(s) + 2 H20(1) --> Ca(OH)2(aq/s) + H2(g).
What will be the volume of hydrogen produced at 27°C and 7.00 x 102 torr when 25
g of calcium and 25 g of water react?
Answer:
[tex]V=16.65L[/tex]
Explanation:
Hello,
In this case, considering that both 25 g of calcium and water react, the first step is to identify the limiting reactant by considering the yielded moles of hydrogen for the same amount of reactant as follows:
[tex]n_{H_2}^{from\ Ca}=25gCa*\frac{1molCa}{40.1gCa}*\frac{1molH_2}{1molCa} =0.623molH_2\\\\n_{H_2}^{from\ H_2O}=25gH_2O*\frac{1molH_2O}{18gH_2O}*\frac{1molH_2}{2molH_2O}=0.694molH_2[/tex]
Thus, since calcium yields a smaller amount of hydrogen, it is the limiting reactant so 0.623 moles of hydrogen are yielded. In such a way, by using the ideal gas equation one finds the volume as follows:
[tex]V=\frac{nRT}{P}=\frac{0.623mol*0.082\frac{atm*L}{mol*K}*300K}{700torr*\frac{1atm}{760 torr} } \\ \\V=16.65L[/tex]
Best regards.
What made the discovery of cells possible? (1 point)
O the observation of cells by Hooke and Pasteur
o the invention of the microscope
o the use of magnifying glasses
o the study of viruses and bacteria
Answer:
the invention of the microscope
Explanation:
because cells are very tiny and cant be seen to the humans naked eye
How do an independent variable and a dependent variable differ in a scientific investigation?
Answer:
stop cheating and be smart
Explanation:
ugh sjdjdkxkdkdkdkdkdkdahahahajajaja
Identify the molecules or ions below as Lewis acids, Lewis bases, or neither. If there is more than one possible site in the molecule/ion, focus on the central or the charged atom. a) _________ b) _________ c) _________ Submit AnswerRetry Entire Group2 more group attempts remaining Show HintPreviousNext
Answer:
This question is incomplete because of the absence of the molecules been referred to in the question. However, the molecules been referred to in the question is in the attachment below
Explanation:
First of all, we have to define lewis acid and lewis base.
A lewis acid is a substance that has the capacity to accept a pair of electrons. For example, H⁺. While a lewis base is a substance that is capable of donating a pair of electrons (to a lewis acid). For example, OH⁻.
Going by the definitions above, we can deduce the type of substance the molecules in the question (attachment) are
a. BF₃ (boron trifluoride) is a lewis acid because the central atom (as suggested to be focused on in the question) which is boron, has the capacity to accept a pair of electrons.
b. The central atom (carbon) in the compound (2-methyl propane) also has the capacity to accept a pair of electrons since it is positively charged (is electron deficient). Hence, it is a lewis acid.
c. The functional group in this compound (trimethyl borate) is the ether. Ethers are generally lewis bases because the oxygen atom in an ether can donate a pair of electrons from it's lone pair. However, the presence of boron which is central to the compound shows it is also a lewis acid, although weak (majorly due to the presence of the ethers).
Some enzymes have one or more sulfhydryl (thiol) groups that are important to enzymatic activity but that can react upon standing in solution to form inactive disulfide bonds.
Thiol reagents, such as 1,4-dithiothreitol (DTT), are often added to the solutions of such proteins to protect them from this reaction and to reverse it when it occurs. (The reverse reaction works best at slightly alkaline pH.) Draw the product formed when DTT reacts with a protein disulfide bond to liberate the free thiol groups. Which of the following occurs in this reaction? A. The protein disulfide is oxidized.
B. The protein disulfide is reduced.
C. DTT is reduced.
D. DTT is oxidized.
Answer:
A. Protein disulfide is oxidized.
Explanation:
When thiol reagents are introduced with some protein solutions they react with molecules of disulfide and oxidize the protein. There occurs inter-conversion of thiol molecules into free disulfide molecules. The DTT reduces the disulfide molecules bonds of proteins and it starts to peptide.
Calculate the mass of a piece of metal if its volume is 2.3cm^3 and density is .486g/cm^3
Answer:
1.1178 g
Explanation:
The product of volume and density is mass:
(2.3 cm^3)(0.486 g/cm^3) = 1.1178 g
_____
It would be a very unusual piece of metal that would float higher in water than most kinds of wood. The given "metal" at (0.486) has less than 3/4 the density of birch (at 0.67), which is a pretty light wood.
What are some examples of matter?
Answer:
An apple.
A person.
A table.
Air.
Water.
A computer.
Paper.
Iron.
Hope this helps you
Answer:
your boddy is made of mater and a clock too it is still a mater of time.
Explanation:
Which of the following additions to alkenes occur(s) specifically in an syn fashion?
A) dihydroxylation using Os04, H202
B) addition of H2
C) hydroboration
D) addition of HCI
E) A, B, and C
Answer:
E) A, B, and C
Explanation:
Syn addition refers to the addition of two substituents on the same face or side of a double bond. This differed from anti addition which a occurs across opposite face of the double bond.
Hydrogenation, hydroboration and dihydroxylation all involve syn addition to the double bond, hence the answer chosen above.
Dihydroxylation using Os04, H202, Addition of H2 and Hydroboration to
alkenes occur in a syn fashion.
Syn addition refers to the addition of two substituents( compounds) on the
same side thereby increasing the number of substituents and a decrease in
the bond order.
Hydrogenation, hydroboration and dihydroxylation all undergo syn addition which is the addition of the substituent to the same side which is why it is the right choice.
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What isotope has 18 protons and 22 neutrons?
Answer:
Argon.
Explanation:
Argon is the element having 18 protons and 22 neutrons present in its nucleus. so its atomic number is 18 and mass number is 40 if we added both number of protons and neurons. Argon belongs to noble family due to completion of outermost shell and non reactive nature. It is the third most abundant gas about 0.934% present on the earth after nitrogen and oxygen.
How many unpaid electrons are in 1s2 2s2 2p6 3s2 3p6
Answer:
No unpaired electrons
Explanation:
This is because it is diamagnetic. Hope that helps:)
Answer:
As we can see, the first shell has its 2 electrons
the second shell has its 8 electrons
we know that the third shell also needs 8 electrons and we can see that the third shell also has 8 electrons.
Therefore, all the shells of this atom are filled and this atom is stable
So we can say that there are no unpaired electrons
Kindly mark Brainliest, thanks
what are limitations of an egg without the shell but has a very thin layer holding it all together
Answer:
As a hen ages, the eggs that she lays get gradually larger. However, the calcium content deposited in the shell remains the same despite the size of the egg. So the eggshells become thinner as the hen ages.
Explanation:
11. A 100% silver ring would be an example of a
a) Pure substance
b) Mixture
c) Really nice gift
d) Compound
Answer:
a pure substance or a compound
Answer:
a pure substance
Explanation:
Any substance made from a single material is pure. Silver is an element just like all the others listed on the periodic table, so a block of silver is pure.
Use the density formula to solve the following problems. A sample of a substance has a volume of 60.5 mL and a density of 1.20 g/mL. What is the mass of the sample?Use the density formula to solve the following problems.
Answer:
72.6 g
Explanation:
Step 1: Given data
Volume of the substance (V): 60.5 mLDensity of the substance (ρ): 1.20 g/mLMass of the substance (m): ?Step 2: Calculate the mass of the substance
The density of a substance is equañ to its mass divided by its volume. The density formula is:
ρ = m/V
m = ρ × V
m = 1.20 g/mL × 60.5 mL
m = 72.6 g
1. A homogeneous mixture of 2 or more metals is called an
a. alloy
C. covalent bond
b. anion
d. chemical bond
what element does this Bohr show ?
Arrange these elements according to first ionization energy.
highest to lowest ionization energy
Li
N
Be
C
B
F
O
Ne
Answer:
please find the attached file.
Explanation:
In the attachment file, we define the order of the ionization of the energy.
As its components are seen, their energy of ionization rises and falls further. Nitrogen and oxygen were detected as an anomaly. Nitrogen has more IE than oxygen because Nitrogen has the [tex]2p^3[/tex] configuration to Is half-filled It's got bigger IE than B. As, be making the 2s2 configuration fully disc.
Arrangement of elements according to first ionization energy from
highest to lowest ionization energy are Ne>F>O>N>C>B>Be.
Neon, a noble gas with a fully filled electron shell, has the highest ionisation energy of the substances on this list, making it the most stable and least likely to lose an electron. Fluorine has the second-highest ionisation energy, after helium. Due to its strong electron attraction, it is a highly electronegative element, making it more challenging to remove an electron from its outer shell. The ionisation energy of oxygen is third highest. Additionally, it has a high electronegativity and expels an electron with a lot of energy.
The fourth-highest ionisation energy is that of nitrogen, abbreviated as N. In terms of electronegativity, it is comparable to oxygen and requires a lot of energy to remove one electron. Carbon has the fifth-highest ionisation energy, after hydrogen and helium. An enormous amount of energy is needed to take an electron out of its outer shell. The second-lowest ionisation energy on this list belongs to borax, abbreviated as B. Compared to the other elements, boron is simpler to remove an electron from. Beryllium, symbol Be, has the lowest ionisation energy of all the elements on this list. From among these elements, an electron can be taken out the simplest.
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Bromine gas in a container is heated over a flame. What happens to the average kinetic energy of the bromine
particles?
Olt decreases rapidly.
It increases quickly.
O It remains the same.
O It decreases slowly.
Answer:
The answer is b
Explanation:
I got my answer off of quizlet
Answer:
B) It increases quickly.
Explanation:
Edg 2020
A few years ago, a newspaper article reported that the Utah Industrial Depot west of Salt Lake
City had made the short list as a possible storage site for 4,408 metric tons of mercury metal.
This material is owned by the Defense National Stockpile Center. Mercury is mined primarily in Algeria, China, Kyrgyzstan, and Ukraine. At least part of this stockpiled material is from
payments to the US made by Spain as part of a WWII war debt. How many atoms of mercury
does this amount represent? (1 metric ton is 1000 kg, and 1 kg is 1000 g)
Answer:
There are [tex]1.323\times 10^{31} atoms[/tex] of mercury in 4,408 metric tons.
Explanation:
Mass of mercury metal = 4,408 metric ton
1 metric ton = 1000 kg
4,408 metric ton = 4,408 × 1000 kg = 4,408,000 kg
1 kg = 1000 g
4,408,000 kg = 4,408,000 × 1000 g = 4,408,000,000 g
[tex] 4,408,000,000 g=4.408\times 10^9 g[/tex]
Mass of mercury = [tex]4.408\times 10^9 g[/tex]
Atomic mass of mercury = 200.59 g/mol
Moles of mercury = n
[tex]n=\frac{4.408\times 10^9 g}{200.59 g/mol}[/tex]
[tex]1 mole=N_A=6.022\times 10^{23}[/tex] atoms/molecules/ ions
Number of atoms of mercury in n moles = N
[tex]N=n\times N_A[/tex]
[tex]N=\frac{4.408\times 10^9 g}{200.59 g/mol}\times 6.022\times 10^{23}\\=1.323\times 10^{31} atoms[/tex]
Hence, there are [tex]1.323\times 10^{31} atoms[/tex] of mercury in 4,408 metric tons.
Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?
If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.
If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.
If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.
If the substance is a liquid or solid, production of an odor would indicate a chemical change.
Answer:
its D
Explanation:
Answer:
D
Explanation:
i need help simplifying 4+7(x+3)
Answer:
7x+25
Explanation:
Draw the products formed when 2−propanol [(CH3)2CHOH], the main ingredient of rubbing alcohol, is treated with H2SO4.
Answer:
Explanation:
Elimination reaction occurs when 2−propanol [(CH3)2CHOH] is treated with H2SO4, this is because the H2SO4 is a dehydrating agent. With concentrated tetraoxosulphate (VI) acid at 180°C, 2 - propanol reacts to form a conjugate acid and a conjugate base.
The reaction formation and the products can be seen in the attached image below.
Determine the number of water molecules in 115g of chromium(III) oxalate trihydrate.
Answer:
[tex]4.92x10^{23}molecules H_2O[/tex]
Explanation:
Hello,
In this case, since the chromium(III) oxalate trihydrate is Cr₂(C₂O₄)₃ ·3H₂O whose molar mass is 422 g/mol and one mole of chromium(III) oxalate trihydrate contains three moles of water, by also considering that one mole of substance contains the Avogadro´s number in particles, the number of water molecules turns out:
[tex]=115gCr_2(C_2O_4)_3\ 3H_2O*\frac{1molCr_2(C_2O_4)_3\ 3H_2O}{422gCr_2(C_2O_4)_3\ 3H_2O}*\frac{3molH_2O}{1molCr_2(C_2O_4)_3\ 3H_2O} *\frac{6.022x10^{23}molecules H_2O}{1molH_2O} \\\\=4.92x10^{23}molecules H_2O[/tex]
Best regards.
In a galvanic cell:______.a. reduction occurs at the (name of electrode) _____________b. the anode is the (sign) electrode anions flow in solution toward the (name of electrode)__________ ___________ electrons flow from the (name of electrode) to (name of electrode) ________ _______
Answer:
In a galvanic cell:
a. reduction occurs at the cathode.
b. the anode is the (-) electrode. Anions flow in solution toward the anode. Electrons flow from the anode to the cathode.
Explanation:
The experimental apparatus for generating electricity through the use of a spontaneous reaction is called a galvanic cell or voltaic cell.
By definition, the anode in a galvanic cell is the electrode at which oxidation occurs and the cathode is the electrode at which reduction occurs.
To complete the electrical circuit, the solutions must be connected by a conducting medium through which the cations and anions can move from one electrode compartment to the other. This requirement is satisfied by a salt bridge, which, in its simplest form, is an inverted U tube containing an inert electrolyte solution, such as KCl or NH₄NO₃, whose ions will not react with other ions in solution or with the electrodes.
During the course of the overall redox reaction, electrons flow externally from the anode through the wire to the cathode. In the solution, the cations move toward the cathode, while the anions move toward the anode.
An electric current flows from the anode to the cathode because there is a difference in electrical potential energy between the electrodes.
A common example of a galvanic cell is the Daniell cell, with Zn and Cu electrodes and ZnSO₄ and CuSO₄ solutions.
Q1. Briefly explain why the Zeff experienced by a valence electron in Cl is larger than in Mg. Q2. Briefly explain why the Zeff difference described in Q1 explains why the radius of Cl is smaller than the radius of Mg. Q3. Briefly explain, in terms of the principal quantum number (n), why the radius of Ba is larger than the radius of Mg.
Answer:
See explanation
Explanation:
Q1:
Chlorine has 17 protons while magnesium has only 12 protons. Recall that the Zeff depends on the size of the nuclear charge. The greater the size of the nuclear charge, the larger the Zeff experienced by a valence electron.
Q2:
The larger the Zeff, the smaller the atomic radius. Since the valence electrons of Cl experience a greater Zeff than those of Mg due to greater size of the nuclear charge, the atomic radius of chlorine will be smaller than that of Mg.
Q3:
The radius of an atom increases as the value of the principal quantum number (n) increases down the group due to addition of more shells. The greater the number of shells added, the greater the principal quantum number (n) and the greater the atomic radius, hence the answer.
The electrode that contains the item to be electroplated
a) anode
b)cathode
The electrode that contains the item to be electroplated is a cathode. The correct option is B.
What are electrodes?
Electrodes are a source of conductance of electron and behaves as a conducting material for the current too it is of two types mostly the cathode and the anode.
The anode is responsible for oxidation mostly called oxidation half cell and releases the electron while the cathode is responsible for the gain of electrons and deposition of the material as electroplated and called reduction half cell.
Therefore cathode is an electrode that contains the item to be electroplated. Option B is correct.
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Ice Select one: a. is a crystal of water molecules packed in an open structure stabilized by hydrogen bonds. b. is less dense than liquid water. c. contains 17% more hydrogen bonds then water. d. all of the statements above are true. e. none of the statements above are true.
Answer:
All of the statements above are true.
Explanation:
Ice is solid water. Ice consists of an array of water molecules arranged into a crystal lattice. Ice has spaces between the water molecules so it is less dense than liquid water. Ice is about 9% less dense than liquid water. This accounts for the fact that it floats on water.
Ice contains more hydrogen bonds per water molecule when compared to liquid water.
I need help answering these Significant Figures - precise measurements questions
1) 0.00030 = ______ 2) 3.3 x 108 = ______ 3) 1000 = ______
4) 3.50 x 107 = ______ 5) 2.100 x 10-1 = ______ 6) 1101 = ______
7) 0.043 = ______ 8) 0.09730 = ______ 9) 2010 = ______
10) 3060 = ______ 11) 43.8 = ______ 12) 0.00810 = ______
13) 5.0 x 10-4 = ______ 14) 8.570 x 10-8 = ______ 15) 7.500 x 103 = ______
Add/ Subtract Sig Fig: Solve and Round accordingly.
1) 2.6391 + 34.3124 + 1.22 = _______ 8) 94.1 + 5.7 = _______
2) 3.9 + 9.7113 + 38.9223 = _______ 9) 81.29 - 75.7 = _______
3) 9.9 + 77.1135 + 2.226 = _______ 10) 61.741 + 6.632 = _______
4) 7.8 + 17.2 = _______ 11) 6.1 + 28.2 + 94.229 = _______
5) 6.219 - 2.9 = _______ 12) 8.1732 - 1.933 = _______
6) 9.8 + 27.771 = _______ 13) 81.87 + 3.37 + 4.8421 = _______
7) 4.48 + 7.2155 + 13.9 = _______ 14) 17.56 - 6.4929 = _______
Multiply/Divide Sig Fig: Solve and round accordingly
1) 0.005 x 81.327 x 1000 = __________ 9) 0.0027 x 1.554 x 3090 = __________
2) 5 x 268 = __________ 10) 38.245 x 0.0069 = __________
3) 565 x 0.0054 x 4040 = __________ 11) 89.0 x 19.13 x 8400 = __________
4) 100 ÷ 2.0 = __________ 12) 208 ÷ 7.6 = __________
5) 4 x 23 = __________ 13) 34 x 800 = __________
6) 5006 ÷ 5.979 = __________ 14) 204 ÷ 92.731 = __________
7) 80 ÷ 8.1 = __________ 15) 300 ÷ 98.434 = __________
8) 0.4 x 0.003 x 2400 = __________ 16) 0.031 x 0.007 x 100 =
Answer:
[tex]3.0 x {10}^{4} [/tex]
