Answer:
The answer for the first question is Mechanical energy and the second one is position A.
What is Kepler’s second law?
Answer:
Keplers second law was Kepler's laws of planetary motion
Explanation:
Kepler’s second law states that a planet moves in its ellipse so that the line between it and the Sun placed at a focus sweeps out equal areas in equal times.
Alkali metals are highly since they easily to form ions.
Explanation:
Alkali metals are highly electropositive lements. They readily donate their valence electrons to form ionic compounds
According to the electronic configuration, alkali metals are highly reactive as they have 1 valence electrons and can easily form ions.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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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 ...
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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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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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.
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.
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:
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).
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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.
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.
how are silicate minerals different from nonsilicate minerals
Answer: The main difference between silicate minerals and nonsilicate minerals is that silicate minerals are composed of silicate groups whereas Nonsilicate minerals have no silicate groups.
Explanation:
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:
Which strawberries are under a blue filter?
Answer:
strawberries appear red.
Explanation:
In other words, because we know strawberries are supposed to be red, our brain perceives a blue filter over the image and corrects for it, making the strawberries appear red
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
đốt cháy hết 9g kim loại magie Mg trong không khí tích tụ được 15g hợp chất magie oxit MgO. Biết rằng magie cháy là xảy ra phản ứng với khí O2 trong không khí
a, Viết công thức về khối lượng của phán ứng xảy ra
Tính khối lượng của khí oxi phản ứng
Answer:
jijji[ojooooooooooooooooooooooooo
Explanation:
kjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
Lithium and Fluoride be neutral?
2sentence
Answer:
Ionic
Explanation:
Lithium is an alkali metal and form an ionic bond by donating an electron.
Fluorine is a halogen and forms ionic bonds by accepting an electron.
Diagramming the formation of an ionic bond between lithium and fluorine looks exactly like the diagrammed bond between sodium and chlorine in the video below. Lithium behaves just like the sodium (Na) and fluorine will act like the chlorine (Cl).
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.
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]
CO + F2 -> COF3 please balance it
Answer:
2Co + 3F₂→ 2CoF₃
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）
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
If the experiment is repeated at ph 11, the observed activity level of the enzyme will most likely be:
If the experiment is repeated at the pH 11 level, the enzyme activity will be less than at the pH 9 level.
We can arrive at this answer because:
Through the graph, we can see the level of enzyme activity in relation to pH.From pH 5, we can see that as the pH goes up, the enzyme activity goes down.In this case, we can say that if the experiment is repeated at pH 11, the enzyme activity level will be even lower, since from pH 5 onwards, as the pH rises, the enzyme activity goes down.
The question above is incomplete, however, you can see a full version of it in the image below.
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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
how many bases are needed to code for one amino acid?
Answer:
Three. Also known as a triplet code.
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.
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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anyone wanna help me plese
An atom of lithium (Li) and an atom of fluorine (F).
What do you notice about the number of valence electrons in each?
How could these two atoms make each other “happy”?:
Would they still be neutral?:
Answer:
Lithium gives up its one electron to make both atoms happy. So the fluorine atom has eight electrons, and a filled outer shell.
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
20 POINTS AND BRAINLIEST OLEASE HELP
d. Given the orbital configuration of phosphorus, explain why phosphorus
forms 3 bonds in molecules such as PH3 and PC13. (1 point)
Answer:
The reason why phosphorus usually forms 3 bonds is because of its valence electrons. Phosphorus has 5 valence electrons and due to the octet rule, it will strive to gain 3 more in order to fill it outer shell and become stable. PH3 and PCI3 are great examples of this. In the compound PH₃, The phosphorus atom is in a covalent bond to three hydrogen atoms. Each of the three hydrogen atoms share their one valence electrons with phosphorus, and the phosphorus atoms shares one electron with each hydrogen atom. In the compound PCl₃, one phosphorus atom shares one electron with each chlorine atom, and each chlorine atom shares one electron with phosphorus. Note that each of these compounds are covalent bonds. As show, phosphorus forms 3 bonds because it needs 3 more electrons to become stable.
