Answer: The correct answer is 24
Explanation:
explain what keeps the electrons confined in the space surrounding the nuleus
Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
When it comes to latent print deposits for fingerprints, what are the two categories of surfaces? Provide at least one example of each category.
Answer: The two categories is porous evidence and nonporous evidence. Nonporous item of evidence is when you put the latent print on the surface and it just sits on the surface. Porous item of evidence is when you put the latent print on the surface and it absorbs the latent print deposit.
What characteristics are similar between two biomes
Answer:
Niches
Explanation:
ZN + HCI —> ZnCI2+ H2
what is the reaction and is it balanced?
How much does a 130 kg object weigh on Earth?
A 130 kg object weighs approximately, 1274 Newtons on Earth.
The weight of an object on Earth can be calculated using the formula:
Weight = mass × acceleration due to gravity
Weight is calculated by multiplying the mass of an object by the acceleration due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 meters per second squared (9.8 m/s²).
In this case, we have a 130 kg object. To find its weight on Earth, we can use the formula:
Weight = mass × acceleration due to gravity
Weight = 130 kg × 9.8 m/s²
Weight = 1274 Newtons (N)
So, the weight of a 130 kg object on Earth is approximately 1274 Newtons.
Therefore, a 130 kg object weighs approximately, 1274 Newtons on Earth.
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Can we create matter? Why or why not?
Answer:
The first law of thermodynamics doesn't actually specify that matter can neither be created nor destroyed So yes we can create matter because matter is every where buildings ,structures etc. So the answer is yes!
Explanation:
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what are invertebrate? give any three example.
Answer:
Invertebrates are animals which do not have vertibral column. They do not debelop it also. For example: Arthropods , Crawfish and Sea Urchin.
Can you divide equation II by another factor and still have it be correct? Why or why not?
Answer:
No. You can not simplify a coefficient of.
Explanation:
:)
find the pH of a 0.79 M solution of NH3,a weak base,if it has a Kb of 4*10 -5
Answer:
Cat
Explanation:
Bcuz I said so that it's a cat
How many atoms are in 355 mol Na?
Answer:
2.138 x 10^26 atoms Na
Explanation:
atoms Na = 355 mol Na x (6.022 x 10^23 atoms Na/1 mol Na) = 2137.81 x 10^23 atoms Na = 2.138 x 10^26 atoms Na
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Consider the reaction pathway graph below.
The rate increases by a factor of 9 when the concentration of A triples. The rate triples when the concentration of B triples. What is the new rate law for the reaction?
A) endothermic because Hrxn=-876.8 kJ
B) endothermic because Hrxn=876.8kJ
C)exothermic because Hrxn= -1099.6kJ
D) exothermic because Hrxn=1099.6kJ
Answer:
B is the answer
Explanation:
Can a combination reaction be a redox reaction
Answer:
Yes.
Explanation:
A combination reaction can be a redox reaction.
Example; C + O2 = CO2
What fraction of a sample of ³H will be left after 36.78 years while undergoing beta decay with a half-life of 12.26 years?
Explanation:
no lo c crack solo es para poder iniciar la sección y no c ingel Jaksjs
when a substance like sugar dissolves in water, the particles intermingle. This is possible because the particles of sugar
a)have spaces between them
b)have strong attractions to eachother
c)are pure
d)are vaporized
Answer:
A
Explanation:
The diagrams P, Q and R show the atoms in a compound, an element and a mixture,
but not necessarily in that order.Which row of the table correctly identifies P, Q and R?
look at the photo
Answer:
C.
Explanation:
A mixture contains two or more substances.
A compound contains elements in a fixed ratio.
P = Element
Q = Compound
R = Mixture
The correct order is C.
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Which describes the molecule shown below?
O A. Unsaturated alkyne
O B. Saturated alkane
O C. Saturated alkene
O D. Unsaturated alkane
The description of the molecules shown is it is unsaturated alkynes. The correct option is A.
What are unsaturated alkynes?Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.
The pie bond shows that the hydrogen atoms are lost from the alkanes.
Thus, the correct option is A, unsaturated alkynes.
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HCO3− + H2S → H2CO3 + HS−
In the reaction above, what is the Bronsted-Lowry acid?
Answer:
H₂S is the proton donor => Bronsted Acid
Explanation:
Which property of light does this diagram show?
2Mg + O2 → 2Mgo
What is the greatest amount of MgO (in moles) that can be made with 7.8 moles of Mg and 4.7
moles of O,? Which is the limiting reactant? Which reactant is in excess, and how many moles
of it are left over?
Answer:
it would be 4.5 mole left over
Explanation:
The greatest amount of MgO will be 7.8 mole and Mg will be limiting reagent.
What is limiting reagent?The substance that would be entirely absorbed in the end of the chemical process is called as the limiting reagent.
What is mole?A mole would be defined as the quantity of a material that includes precisely 6.02214076 X [tex]10^{23}[/tex] of the particular chemical elementary entities.
Calculation of amount of MgO
The balanced chemical equation is 2 Mg + [tex]O_{2}[/tex] → 2MgO
It can be seen that 2 mole of Mg reacts with 1 mole of oxygen.
So, 7.8 mole of Mg = 7.8 / 2 = 3.9 mole of [tex]O_{2}[/tex].
Since, [tex]O_{2}[/tex] will be added in given reaction vessel will be 4.7 moles.
So, (4.7 - 3.9) = 0.8 moles of [tex]O_{2}[/tex] left but in this case Mg will be finished. Therefore, Mg will be limiting reagent.
It can be understood that 2 moles of Mg will give 2 mole of MgO.
That's why , 7.8 moles of Mg = 2 × 7.8 / 2 = 7.8 moles of MgO.
Therefore, 7.8 mole of magnesium oxide (MgO) could be generated and Mg will be limiting reagent.
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Why do you think the astronomical unit is not used to measure distances on earth?
Answer:One Astronomical Unit is the distance between the Earth and the Sun, this acts as a sort of a cosmic metre stick. Astronomers don't and cannot measure distances. Distances are merely inferred from what actually has been measured, such as an angle, a relative luminosity, a time period
Explanation:
Answer:
you would have to use decimals in the quadrillionths if you measure in meters. so 11 0s before the number
What do food webs begin with as the first source of energy A plants B consumers C the sun D decomposers
Answer:
C:sun
Explanation:
A 200 g block of a substance requires 520 J of heat to raise its temperature from 25°C to 45°C.
Use the table to identify the substance.
The answer is gold.
Explanation:Substance: Specific Heat (C) in joules per gram/degrees centigrade:
Water (ice) 2.05
Iron 0.46
Aluminium 0.90
Gold 0.13
Copper 0.39
Ammonia (liquid) 4.70
Ethanol 2.44
Gasoline 2.22
Water (liquid) 4.18
Water (vapor) 2.08
Air (25 degrees Celsius) 1.01
Oxygen 0.92
Hydrogen 14.30
To know that we clear the equation q=m*C*Δt for the specific heat (C) and solve the equation. Keep in mind that we need to use the heat (520 J) in Joules since the values from the question and the table are in Joules.
q/m∗ΔT = C = 520J/200g∗(45degC−25degC) =
0.13J/gdegC
As you can see, the substance that has this specific heat is GOLD.
The value of specific heat for the given data in the question will be for gold:-
[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]
What will be the Specific heat of the material?Specific heat can be defined as the amount of heat one kg or gram substance can absorb or release for a unit temperature difference.
The formula for the heat will be:-
[tex]Q=mc\Delta T[/tex]
m= Mass of substance
c= specific heat of the substance
[tex]\Delta T[/tex]= Temperature difference
Now the given data is
m= 200 g
Q= 520 J
[tex]\Delta T[/tex]= (45-25)=20
[tex]Q=mc\Delta T[/tex]
[tex]520=200\times C\times 20[/tex]
[tex]C= \dfrac{520}{200\times 20} =\dfrac{520}{4000} =0.13\ \dfrac{J}{g ^oC}[/tex]
Since the value of specific gold is [tex]0.13\ \dfrac{J}{g ^oC}[/tex]
Thus the value of specific heat for the given data in the question will be for gold:-
[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]
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The heaviest element to be created by exothermic nuclear fusion is:
oxygen
carbon
iron
helium
Answer:
The heaviest element to be created by exothermic nuclear fusion is Iron
Explanation:
Because it is the heaviest element produced during fusion without having to add energy, and it is the lightest element produced during fission without having to add energy. Energy-wise, everything in the universe wants to be iron! Iron is the most abundant element on Earth, making up 34.5 percent of Earth's mass.
Aqueous sodium hydroxide forms a light blue precipitate. What is the formula of the blue precipitate?
Answer:
Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)
Explanation:
Use of aqueous sodium hydroxide is a precipitation reaction to test for anions or cations. Aqueous sodium hydroxide in a precipitate test forms a insoluble precipitates along with some colors characteristics.
Aqueous sodium hydroxide (NaOH) when mixed with copper(II) (Cu2+) forms a blue precipitate. The formula is as follows:
Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)
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Answer: It’s Lower
What can you say about the pH of a carbonic acid solution compared to that of a sulfuric acid soloution with the same contention: Strong acids dissociate fully in water to produce the maximum number of [tex]H^{+}[/tex]ions. The pH levels of strong acids are smaller than those of low acids, which is why the reactions rates for strong acids are greater than the reactions of weak acids with products like metals, metal carbonates, etc. Meaning The pH Level is lower.
respond if you got a min to help me with my problem
Answer:
I mean i dont know......
Explanation:
What is the empirical formula of a compound that contains 85% Ag and 15% F by mass?
Answer: AgF
Explanation: 85 / 108 (the relative atomic mass of Ag) = 0.79
15 / 19 (the RAM of F) = 0.79
This is a 1:1 ratio so the empirical formula is AgF.
AgF is the empirical formula of a compound that contains 85% Ag and 15% F by mass.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Molar mass of Ag =108 amu
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
85 ÷ 108 = 0.79
The molar mass of F = 19amu
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
15 ÷ 19 = 0.79
This is a 1:1 ratio so the empirical formula is AgF.
Hence, AgF is the empirical formula of a compound that contains 85% Ag and 15% F by mass.
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Please answer these as quick as possible! thank you!! Q4. What is the name of group 1 in the periodic table?
Q5. What is the name of group 7 in the periodic table?
Q6. What is the name of group 8 (or group-0 as it's sometimes called) in the periodic table?
Answer:
1st group-alkali metals
7th group-halogen group
8th group- noble gas group
Answer:
4. Group 1 in periodic table is called alkali metals.
5. Group 7 in periodic table is called halogens.
6. Group 8 or 0 in periodic table is called noble gases.
What is the molar mass for MgO?
Answer:
40.3044 g/mol
Explanation: