Answer:
Since they have an electronegativity difference of 0.4 then they will form a Covalent Bond.
A box was measured with three different rulers. Its length was 64.2 cm, its width was 48 cm, and its height
was an impressive 12.385 cm.
Calculate the volume of the box, answering with the correct number of sig figs. Don't forget units and be sure
to show your work!
PLEASE HELP I WILL MAKE BRAINLIEST
64.2cm * 48cm * 12.385cm = 38165.616cm^3
减少到两位有效数字是： 38000cm^3
本题已由中国数学会官方解答（现有会员：2人）
How many total atoms of Oxygen (O) are represented below?
1 Na3C2(01H1)1
Answer:
1
the coefficient for the whole thing is 1
the subscript of O is 1
the subscript of (O1H1) is 1
Various methods of aquaculture can be used to grow species of marine fish. Consider the figure below, which shows one way that an aquaculture system can be
designed to allow water to flow freely through the net. Explain whether this represents an open or closed system and one benefit of using this type of system.
2015. SeaChoice org
Answer:
This is an open system, and one benefit is that it does not require as much filtration and maintenance.
Explanation:
An electron vacuum tube was sealed off in my experiment at a pressure of 8*10^-10 atm. The volume of the tube is 30 dm^3. Find the number of molecules in the tube.
Answer:
[tex]6\times10^{14}[/tex]
Explanation:
[tex]\mathrm{P=8\times10^{-10}}\\\\\mathrm{V=30\:dm^3=30\:L}[/tex]
[tex]\mathrm{pv=nRT}\\\\\mathrm{n=\frac{PV}{RT}=\frac{8\times10^{-10}\times30}{0.0021\times30}}[/tex]
A decomposition chemical reaction can be compared to
Select one:
a.
eight couples doing a square dance.
b.
a dancing couple breaking up.
c.
two dancing couples switching partners.
d.
two single people joining for dance.
Answer:
I think is letter D
Explanation:
sana makatulong
Answer:
b. a dancing couple breaking up
Explanation:
Decomposition Reaction :
It is a type of reaction in which one reactant breaks out i.e decomposes into two or more products
eg : [tex]H_{2}CO_{3} - >[/tex][tex]CO_{2} + H_{2}O[/tex]
Therefore,
Just like a reactant splits or breaks into two or more products in a decomposition reaction the dancing couple in option b are also breaking up whereas no such split or breakup is mentioned in other options.
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how many bases are needed to code for one amino acid?
Answer:
Three. Also known as a triplet code.
Which organelle acts like a screen door, separating its contents from the outside world?
capsule
mitochondria
plasma membrane
endoplasmic reticulum
Answer:
Plasma Membrane
Explanation:
Its the outer wall of a cell
Answer:
The answer is plasma membrane took the k12 test
Explanation:
When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water. Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O
In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.
Answer:
The law of conservation of mass states that mass is neither created nor destroyed but the mass of the system must remain constant over time. The total number of atoms in the reactants is equal to the total number of atoms in the product. Therefore, this chemical equation shows that energy is conserved and demonstrates the law of conservation of mass.
To demonstrates that matter is neither created nor destroyed in the chemical reaction the number of atoms or masses in the reactant sides must be equal to the number of atoms or masses of the product side.
The law of conservation of masses states that masses are neither created nor destroyed but can be transformed from one form to another.
In a chemical reaction, it simply means the masses of the reactant will be equal to the masses of the product.
For a chemical equation to obey law of conservation of mass, the equation must be balanced. Therefore,
Mg(OH)₂ + 2HNO₃ → Mg(NO₃)₂ + 2H₂O
Therefore, to demonstrates that matter is neither created nor destroyed in the chemical reaction the number of atoms or masses in the reactant sides must be equal to the number of atoms or masses of the product side.
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if the half-life of radon-222 is 3.82 days, then how much of a 10.0 gram sample of radon-222 would be left after 7.64 days
Answer:
If the half-life of radon-222 is 3.82 days, then how much of a 10.0 gram sample of radon-222 would be left after 7.64 days
✓ 2.50g
Explanation:
Which of the following pairs
would most likely form
a covalent bond?
a.Na and C
c. Mg and N
b. Li and CI d. S and F
Answer:
d
Explanation:
because sulphur and fluorine are both non metals
How many electrons are in ewch energy levels
Answer:
To determine how many electrons fit in each energy level, use the formula:
2n²
N is equal to the number of energy levels. Using this formula, we can determine that there are:
First energy level holds 2 electronsSecond energy level holds 8 electronsThird energy level holds 18 electronsFourth energy level holds 32 electronsAnd so on...Keep in mind though, that for an atom's outermost shell, it can only contain 8 valence electrons due to the octet rule that states that an element only needs eight electrons in their outermost shell in order to be stable.
List three things you wonder about bath bombs
Almost all bath bombs contain sodium bicarbonate and citric acid. These two ingredients combine to create that fizzing sensation bath bombs are famous for. More than that, though, they clean, deodorize, and repair skin, and strengthen blood vessels. These two main ingredients leave you with healthier, younger looking ...
What is the atomic number of an element?
Answer:
Atomic number of an element represents the number of proton each atom within the element contains.
Below is the picture of where on the periodic table is the atomic number located:
Hope this helps!
Answer:
The number of protons in an atom of an element.
Explain how a drop of water in a lake (as part of the hydrosphere) can cycle through the atmosphere, geosphere and biosphere.
Answer:
Explanation:
We'll start with a single water molecule, H2O in a lake (hereafter named "WM". A fish swallows WM and it remains there when an eagle catches the fish and carries it to it's nest to feed it's young. WN is transfered to the baby eagle where it circulates in it's blood stream. Eventually WM is excreted and it falls to the forest floor. A tree root absorbs it and it is carried to a leaf where WM plays a role of dissolving minerals for use in the tree's cellulose production. During one of it's trips in the leaf, WM evaporates and leaves the plant as an airborn molecule. Although very happy his his new life above ground, WM absorbs enough of the sun's energy to travel high into the atmosphere. He is joined by many other H2O molecules, but the temperature is much lower than closer to Earth and the water molecules start bumbing into each other. WM is joined by several million other H2O molecules since they are attracted to each other. They This congregation of water molecules first appears as a cloud, and then as a radar blip that the local weather forecaster predicts will turn into rain. The weather forecat is always wrong, but while it did not rain, the temperature was low enough for the clumps of molecules began to drift towards Earth's surface. It is it really cold, they attach themselves to objects, such as trees, cars, humans, etc. that is termed frost or snow. The water eventually returns to Earth as rain, snow, or frost. WM wound up in a lake and was processed through a water treatment plant, sent on his way down a pipe, and found himself in a washing machine. He then travelled to a waste treatment plant and was released back into the same lake lake from which he started.
Use the reaction to complete the activity.
KOH + HBr → KBr + H2O
A student sets up a titration apparatus with 25 mL of potassium hydroxide in the flask. In three to five sentences, explain how the student can use a 0.1 M solution of hydrobromic acid to determine the concentration of potassium hydroxide in the reaction.
In order to determine the concentration of the hydrobromic acid, the student would need to put some amount of the acid into the burette, note the initial burette reading, and then titrate it against the potassium hydroxide in the flask using a suitable indicator to indicate the endpoint of the reaction.
Thereafter, the volume of hydrobromic acid required to neutralize 25 mL of the potassium hydroxide would be obtained. The following equation can then be used to obtain the concentration of the hydrobromic acid:
Ca = [tex]\frac{Cb.Vb.Na}{Va.Nb}[/tex]
Where Ca - concentration of hydrobromic acid, Va - volume of hydrobromic acid used in titration, Cb - concentration of potassium hydroxide, Vb - volume of potassium hydroxide, Na - stoichiometric number of moles of hydrobromic acid, and Nb - stoichiometry number of moles of potassium bromide.
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Answer:In order to determine the concentration of the hydrobromic acid, the student would need to put some amount of the acid into the burette, note the initial burette reading, and then titrate it against the potassium hydroxide in the flask using a suitable indicator to indicate the endpoint of the reaction.
Thereafter, the volume of hydrobromic acid required to neutralize 25 mL of the potassium hydroxide would be obtained. The following equation can then be used to obtain the concentration of the hydrobromic acid:
Ca =
Where Ca - concentration of hydrobromic acid, Va - volume of hydrobromic acid used in titration, Cb - concentration of potassium hydroxide, Vb - volume of potassium hydroxide, Na - stoichiometric number of moles of hydrobromic acid, and Nb - stoichiometry number of moles of potassium bromide.
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Explanation:t
What is the oxidation state of a lone element?
A. It is the same as in a compound.
B. It is always 1.
C. It is its most likely oxidation state.
D. It is always 0.
*** its D ***
Answer:
i think the answer is b or c
Where can electrons be found?
Which of these is evidence that Earth's outer core is liquid?
Answer:
b
Explanation:
s waves cannot pass through but p waves can.
observation from earth quakes
Why cant you just add up the average masses, divide by three and get an atomuc mass?
Answer:
Differences are particle, nor does it measure their total mass as you did. particles and their relative abundances. It does not count each individual A mass spectrometer yields only information about the masses of atomic They are equal.
Explanation:
HOPE IT HELPS
the surface of the moon is
The moon's surface is covered with dead volcanoes, impact craters, and lava flows, some visible to the unaided stargazer. Early scientists thought the dark stretches of the moon might be oceans, and so named such features mare, which is Latin for "seas" (maria when there are more than one).
- BRAINLIEST answerer
In what type of hybrid car do both the gasoline and electric motors run the car?
series
parallel
Explanation:
Series Hybrid:
Under this type of hybrid car, the Series Hybrid also employs both the petrol internal combustion engine as well as the electric motor. However, the internal combustion engine does not propel the car, instead it generates electricity to recharge the battery pack.
Answer:
Parallel
Explanation:
8. If 100 grams of Au-198 decays to 6.25 grams in 10.8 days, what is the half-life of Au-198?
Answer: 2.7 days
Explanation:
You'd divide 100 g by 2 until you reach 6.25 g:
100/2
=
50
;
50/2 (fraction
=
25
;
25/2(fraction
=
12.5
;
12.5/2 (fraction
=
6.25
Since there were four 2s, divide 10.8 days by 4:
10.8 days
4
=
2.7 days
100 g of Au-198 would have a half life of 2.7 days.
given both a nacl and a h2o molecule, explain what type of bond each compound is and justify your reasoning.
Answer:
NaCl= ionic bond.
H2O=covalent bond.
Explanation:
NaCl:
Happens between metal and non-metal. since metal needs to lose an electron to get a full outer shell of electrons, sodium (Na) loses one electron and has a full outer shell of electrons.
chlorine is a gas so it needs to gain electrons to have a full outer shell. since it is in group 7, it needs to gain 1 electron for a full outer shell of electrons.
the lost electron from sodium is given to chlorine. this creates ions (a charged particle) so it is Na+Cl-. this creates a strong electrostatic attraction between the elements and causes them to join together in a lattice form.
H2O:
Covalent bonds happens between 2 gases. they share an electron or 2, and the bonds are very strong.
since oxygen needs 2 molecules to form a full outer shell. hydrogen have 1 atom in outer shell so they share the electron with the oxygen atom.
I can't fully explain why this is for H2O, but I hope you understand it.
CO + F2 -> COF3 please balance it
Answer:
2Co + 3F₂→ 2CoF₃
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which element is most likely to react with Br
Sr
Ar
K
O
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.
Ionic bonds are formed by elements whose electronegativity difference is very large. Since K has high electronegativity among all given elements so K is most likely to react with Br.
Therefore, the correct option is option C.
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17. kilometer
Meaning
Kilometer is a unit which is used for measuring the length or distance between 2 things / places. It's abbreviated as 'km'.
For example, the distance from California to Hawaii using the shortest route (air travel) is about 3,976 km.
________
RainbowSalt2222 ☔
when an action potential abides by the all-or-nothing principle, once it reaches its threshold it moves all the way down the axon
Answer:
Yep and it's threshold is -55 mV.
Which action occurs at an electrode of a galvanic cell?(1 point) plz helpp
anion flow
anion transfer
electron flow
electron transfer
Electron flow is the action which occurs at the electrodes of galvanic cells.
A galvanic cell comprises of the electrolyte and electrodes. There are two
types of electrodes called the cathode and anode.
The cathode is the positive electrode found in electrochemical cells and
electrons flow from it to the anode. Negatively charged ions flow to the
cathode and reduction takes place in it.
The electrons from the cathode are then passed to the anode (negative
electrode) which gets oxidized and we can infer that oxidation takes place in
the anode. The flow of electrons helps to generate electricity.
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balance the following chemical equations
Answer:
2N2 + O2 ⇒ 2N2O
Explanation:
Since I cannot see the product's of the second chemical equation I will only solve the first one.
In order to balance a chemical equation you need to make sure that the atoms on both sides are equal.
In this case we have...
N2 + O2 = N2O
N = 2
O = 2
N = 2
O = 2
Change the coefficient:
N2O = 2N20
2 × 2 = 4
1 × 2 = 2
2N2 + O2 ⇒ 2N2O
Hope this helps.
how do you solve this ?
Answer: go to demos.scientific.com and type each answer if it marches with the question it is the correct answer
Explanation:
