Answer:
See explanation
Explanation:
Hydrogen has only one valence electron. Sometimes, hydrogen is included as part of group 1 or 17 in the periodic table. Is this correct? Well, the answer to this question is not so straight forward!
Let us remember that hydrogen forms a univalent positive ion H^+ just like the group 1 elements, but it also forms a univalent negative ion H^- just like group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements. This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
However, it is convenient to include hydrogen in the main groups 1 or 17 when discussing its chemical properties in order to make it easier to assimilate. If we place hydrogen in group 1, we can understand that it forms univalent positive ions. Similarly, if we place it in group 17, we understand that it forms univalent negative ions.
Most times hydrogen is just written separately at the top right corner of the periodic table and not as a member of any group because of the issues outlined above.
Hydrogen is placed in the main group of the periodic table since it has only one electron in it and it also behaves like alkali metal properties.
Hydrogen atom:Hydrogen forms a univalent positive ion [tex]H^+[/tex]group 1 elements, but it also forms a univalent negative ion [tex]H^-[/tex]group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements.
This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
If we place hydrogen in group 1, we can understand that it forms univalent positive ions and if it is placed in halogen group it will form univalent negative ion.
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whats the answer giving brainliest if it correct
Answer:
c. A flat board tilted at an angle
Explanation:
form the looks of it, and i dont wanna sound like a flat earther her, cuz im not '-', but the best option here would be the flat board at an angle becasue the earth is tilted and isnt even like it said in the prompt.
Hope this helped and idrc about brainliest :)
which will dissolve faster in water rock salt or granulated salt
Answer:
Salt!!!
Explanation:
Which of the following is an example of kinetic energy?
A. The energy of moving particles near a fire
B. The energy in the nucleus of an atom
C. The energy stored in the chemical bonds of fuel
D. The energy a hot air balloon has because of its position in the air
Answer:
A. The energy of moving particles near a fire
Explanation:
PLEASE HELP WILL GIVE BRAINLEIST ASAP Determine the fraction of an original sample of K-42 that remains unchanged after 24.72 hours.
Answer:
25% or 0.25 or 1/4
Explanation:
don't know which form you need so here you have all 3
good luck :)
What types of atoms typically form covalent bonds?
A. Metals with nonmetals, because their difference in electronegativity is above 1.7
B. Metals with nonmetals, because their difference in electronegativity is below 1.7
C. Nonmetals with nonmetals, because they're difference in electronegativity is above 1.7
D. Nonmetals with nonmetals, because of difference in electronegativity is below 1.7
Answer:
D. Nonmetals with nonmetals, because of difference in electronegativity is below 1.7
Explanation:
The types of atoms that typically form covalent bonds are non-metals with non-metals because of the difference in their electronegativity which is below 1.7.
In some instances, the difference can even be zero when dealing with homonuclear substances.
Covalent bond are formed between two or more atoms having low electronegativity differences between them. Each of the atoms share their valence electrons to be able to mimic the noble gases. The participating atoms will put down an unpaired electron to be used in forming a shared pair of electrons between them. What volume (in liters) of a 1.772 M BaCl2 solution is needed to obtain 123 g of BaCl2?
Answer:
Volume required = 0.327 L
Explanation:
Given data:
Volume in L = ?
Molarity of solution = 1.772 M
Mass of BaCl₂ = 123 g
Solution:
First of all we will calculate the number of moles of BaCl₂,
Number of moles = mass/molar mass
Number of moles = 123 g/ 208.23 g/mol
Number of moles = 0.58 mol
Now, given problem will solve by using molarity formula.
Molarity = number of moles / volume in L
1.772 M = 0.58 mol / Volume in L
Volume in L = 0.58 mol / 1.772 M
Volume in L = 0.327 L
Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture
Answer:
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Explanation:
The reaction for the decomposition of ammonia is given by;
2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)
The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.
The pressures of the species are raised to the powers of their respective coefficients.
In this reaction;
Products = N₂ (g) + 3H₂ (g)
Reactant = 2 NH₃ (g)
The pressure equilibrium constant (Kp) is given as;
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
The correct name for the compound N₂O₃ is *
Answer:
Dinitrogen trioxide.
Explanation:
The correct name for the compound [tex]N_2O_3[/tex] is dinitrogen trioxide. The compound [tex]N_2O_3[/tex] also happens to be a covalent compound, and the nomenclature of covalent compounds involves the usage of numerical prefixes such as "mono-" and "tri-".
Since there are two nitrogen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "di-", meaning two, to signify that.
Since there are three oxygen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "tri-", meaning three, to signify that.
A rigid, 28-L steam cooker is arranged with a pressure relief valve set to release vapor and maintain the pressure once the pressure inside the cooker reaches 150 kPa. Initially, this cooker is filled with water at 175 kPa with a quality of 10 percent. Heat is now added until the quality inside the cooker is 40 percent. The water is stirred at the same time that it is being heated. Determine the minimum entropy change of the heat-supplying source if 100 kJ of work is done on the water as it is being heated. Use steam tables.
Answer:
[tex]\Delta S_{source}>-1.204\frac{kJ}{K}[/tex]
Explanation:
Hello!
In this case, given the initial conditions, we first use the 10-% quality to compute the initial entropy:
[tex]s_1=s_{f,175kPa}+q*s_{fg,175kPa}\\\\s_1=1.4850\frac{kJ}{kg*K} +0.1*5.6865\frac{kJ}{kg*K}=2.0537\frac{kJ}{kg*K}[/tex]
Now the entropy at the final state given the new 40-% quality:
[tex]s_2=s_{f,150kPa}+q*s_{fg,150kPa}\\\\s_2=1.4337\frac{kJ}{kg*K} +0.4*5.7894\frac{kJ}{kg*K}=3.7495\frac{kJ}{kg*K}[/tex]
Next step is to compute the mass of steam given the specific volume of steam at 175 kPa and the 10% quality:
[tex]m_1=\frac{0.028m^3}{(0.001057+0.1*1.002643)\frac{m^3}{kg} } =0.274kg\\\\m_2=\frac{0.028m^3}{(0.001053+0.4*1.158347)\frac{m^3}{kg} } =0.0603kg[/tex]
Then, we can write the entropy balance:
[tex]\Delta S_{source}+\frac{Q}{T_1} -\frac{Q}{T_2} +s_2m_2-s_1m_1-s_{fg}(m_2-m_1)>0[/tex]
Whereas sfg stands for the entropy of the leaving steam to hold the pressure at 150 kPa and must be greater than 0; thus we plug in:
Which is such minimum entropy change of the heat-supplying source.
Best regards!
What is the group number of the most nonmetallic group that contains metalloids?
_______________
What is the group number of the most metallic group that contains metalloids?
_______________
Answer:alkali metals group 1
Explanation:practice and get better
Would It be C Please help
Answer:
yes its c
Explanation:
Why are K3[Cr(C2O4)3].3H2O, K2[Cu(C2O4)2].2H2O and K3[Fe(C2O4)3].3H2O coloured, whereas K3[Al(C2O4)3.3H2O is colourless?
Explanation:
If a body reflects only a/few color/s of the visible spectrum by absorbing remaining, it appears in that reflected color/s. In case of water, its tri-atomic (2 atoms of hydrogen and one atom of oxygen) structure does not absorb any colors from the visible spectrum of the light. ... Hence water appears colorless while others do absorb
Due to presence of paired electron in K3[Al(C2O4)3.3H2O , it will show colorless.
What is paired electron?Paired electrons would be those in an atom which occur in pairs in an orbital, while un-paired electrons would be those in an atom that occur alone in an orbital.
Such metals were transition elements, meaning their compounds include un-paired electrons. These un-paired electrons easily create excited energy states, allowing photons to be absorbed and color to be produced.
Therefore, due to the presence of paired electrons complex will be colorless.
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Using the diagram below and the labels attached to it answer the following:
Transverse Wave Anatomy
1. Define the crest and trough of a wave and identify TWO points that represents a crest or a trough.
2. Define wavelength and identify TWO points that could be used in the diagram to measure it.
2. Determine the frequency of this wave if the waves the diagram represents occurred within 1 second.
Answer & Explanation:
Crest is a point in the cycle where maximum or peak amplitude exists. In another way, it is a point on the positive side of a wave where maximum amplitude exits. Trough is a point in the cycle where minimum amplitude exists.
Crest: points A and E
Trough: points C and J
Wavelength is the distance between two crests or two troughs. One example is distance between points A and E.
Frequency is 3 because there are 3 oscillations in 1 second (follow the line from beginning to point D, then D to G, the G to end).
I asked that question on my brainly account to answer your question so the people that answerd my question said this is right I HOPE IT IS!!
1. The highest point or crest of a wave is called a crest, and the lowest point or valley is called a trough.
2. The wavelength of a wave is the distance between its two successive crests or troughs.
3. The frequency of a wave is the number of complete cycles (peak or trough) that occur in a unit time.
1. The highest point or crest of a wave is called a crest, and the lowest point or valley is called a trough. On the other hand, in a transverse wave, the peak and trough will be represented by the places of highest displacement above and lowest displacement below the equilibrium position, respectively.
2. The wavelength of a wave is the distance between its two successive crests or troughs. However, wavelength can be determined by comparing any two locations that are separated by a full circle, such as two successive crests or troughs.
3. The frequency of a wave is the number of complete cycles (peak or trough) that occur in a unit time. If the waves in the diagram are visible within one second, then the frequency will be determined by how many complete cycles were visible within that time.
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how much CaCO3 would have to be decomposed to produce 247 g of CaO
441 g CaCO₃ would have to be decomposed to produce 247 g of CaO
Further explanationReaction
Decomposition of CaCO₃
CaCO₃ ⇒ CaO + CO₂
mass CaO = 247 g
mol of CaO(MW=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{247}{56}\\\\mol=4.41[/tex]
From equation, mol ratio CaCO₃ : CaO = 1 : 1, so mol CaO :
[tex]\tt \dfrac{1}{1}\times 4.41=4.41[/tex]
mass CaCO₃(MW=100 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=4.41\times 100\\\\mass=441~g[/tex]
Which answer best describes the meaning of submerged?
The hurricane produced so much rain and flooding that cars were submerged.
drowned
damp
wet
underwater
Answer:
Drowned
Explanation:
We can use drown here, that sounds appropriate.
how many moles of MgO are there in 403.1g of MgO
Answer: mark as Brainliest
10 moles
Explanation:
moles=mass/molar mass, therefore 403.1/(24.31+16)=10
Answer:
10 moles
Explanation:
moles=mass/molar mass, therefore 403.1/(24.31+16)=10
Need help on both questions. Only if you know.
BRAINLIEST!! IGNORE IF YOU DON'T KNOW Which compound contains the highest percentage of nitrogen by mass? Choose one and show your work.
NH4NH2CO2
NH4NO2
N2O3
NH4Cl
NH2OH
Answer:
NH4NO2.
Explanation:
Hello!
In this case, since the by-mass percent of any element (in this case nitrogen) is computed by:
[tex]\%N=\frac{n_N*m_N}{M}*100\%[/tex]
Whereas n is the number of N in the compound, m the atomic mass of nitrogen (14.01 g/mol) and M the molar mass of the compound. Thus, down below we can find the molar mass of each compound and the by-mass percent of nitrogen:
NH4NH2CO2 = 78.07 g/mol
[tex]\%N=\frac{2*14.01}{78.07}*100\%=35.9\%[/tex]
NH4NO2 = 64.06 g/mol
[tex]\%N=\frac{2*14.01}{64.06}*100\%=43.7\%[/tex]
N2O3 = 76.01 g/mol
[tex]\%N=\frac{2*14.01}{76.01}*100\%=36.9\%[/tex]
NH4Cl = 53.49 g/mol
[tex]\%N=\frac{1*14.01}{53.49}*100\%=26.2\%[/tex]
NH2OH = 33.03 g/mol
[tex]\%N=\frac{1*14.01}{33.03}*100\%=42.4\%[/tex]
In such a way, the compound with the highest percentage of nitrogen by mass is NH4NO2.
Best regards!
Answer:
NH4NO2
Explanation:
The answer is the 2ndone
NH4NO2
Which of the following substances is classified as a solution?
Salt water
Water
Hydrogen
Noble Gas
Answer:
Salt water
Explanation:
Please mark me brainliest and thank me.
Answer:
the answer slat water
Explanation:
What is the chemical name of C4H10
Answer:
Butane
Explanation:
Answer:
Butane
Explanation:
Butane is a colorless gas with a faint petroleum-like odor.
Melting point: -138 °C
The electricity accounts of residents in a very small town are calculated as follows: v If 250 units or fewer are used, the cost is 2 cents per unit; v If more than 250 but not more than 800 units are used, the cost is $10 for the first 250 units and 5 cents for every unit in the excess of 250. v If more than 800 units are used, the cost is $35 for the first 800 units plus 10 cents for every unit in the excess of 800. v A basic service fee of $5 is charged, no matter how much electricity is used. Write a user-defined function program to calculate the fees of any electricity unit, and then write a command to calculate the fee of a resident who used 700 electricity units.
Answer:
For you first question about the defined function program:
if ( v ≤ 250 ) {
set p to (5 + v*.02)
}
elseif ( 250 ≤ v ≤ 800 ) {
set p to (5 + 2500 + (v - 250)*.02)
}
else {
set p to (5 + 28000 + (v - 800)*.1)
}
This function will first check if the user has used how many units and decide which category that user falls into.
Then, it uses that information to execute a command to calculate how much money that user should pay for the electricity bill, factoring in the extra demands from the question.
For your second question:
(5 + 2500 + (700 - 250)*.02)
= (3000 + 450*.02)
= (3000 + 9)
= 3009
The customer should have paid 3009 dollars.
Explanation:
Hope this helped!
If you have 23.8g of CaCl2, how many formula units is it?
Answer:
1.3×10²³ formula unit
Explanation:
Given data:
Mass of CaCl₂ = 23.8 g
Number of formula unit = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 23.8 g/110.98 g/mol
Number of moles = 0.21 mol
1 mole of any substance contain 6.022×10²³ formula unit
0.21 mol × 6.022×10²³ formula unit / 1mol
1.3×10²³ formula unit
NEED HELP ON 8,9,10,and 11. ONLY if you know them please.
Answer:
8: D
9: A
10: C
11: B
6. Think of some other chemical reactions. List them and the type of reaction: exothermic or endothermic. Example: Burning coal - exothermic
Explanation:
When Sulphuric acid is slowly poured into water in a beaker the beaker becomes hot and this is exothermic reaction
when ammonium chloride is dissolved in water in a beaker the beaker becomes cold and this is endothermic reaction
An example of an exothermic reaction is rusting or iron, nuclear fission. Examples of endothermic reactions are the melting of liquid and the evaporation of water.
What is a chemical reaction?A chemical reaction is a process in which one or two substances or compounds, called reactants, react or get mixed with each other and form a totally new compound called a product.
Exothermic reactions are those in which energy is released into the environment after the reaction. The reactant has more energy than the products.
Endothermic reactions are those in which energy is absorbed from the environment. The product has more energy than the reactants.
Thus, rusting on iron or nuclear fission are two examples of exothermic reactions. Liquid melting and water evaporation are two instances of endothermic processes.
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Consider the elements: Na, Mg, Al, Si, P.
a. Which element has the lowest second ionization energy?
b. Which element has the smallest atomic radius?
c. Which element is least metallic?
d. Which element is diamagnetic?
Answer:
The elements mentioned in the series are Na, Mg, Al, Si, and P. It can be seen that all these elements are located in the same period. The atomic number of the mentioned elements are Na-11, Mg-12, Al-13, Si-14, and P-15.
a) There will be an increase in the ionization energy with the increase in the element's atomic number across a period. More energy is needed to withdraw an electron from a completely occupied shell in comparison to an incompletely occupied shell.
The atomic number of Na is 11. When one electron is withdrawn from Na, it gets converted into the inert gas configuration of Ne. Thus, it will require more energy to withdraw the second electron from Na. Hence, Na exhibits the lowest second ionization energy.
b) Across the period, with an increase in the element's atomic number, the atomic radii reduces from left to right. Thus, P exhibits the smallest atomic radius.
c) The metallic nature of the elements reduces from left to right across a period in the periodic table. Thus, P is the least metallic element.
d) Diamagnetic signifies towards the element that exhibits pair electrons in its sub-shells. The electronic configuration of Mg is,
1s2 2s2 2p6 3s2
In Mg, no unpaired electrons are present, while all the remaining elements mentioned exhibit unpaired electrons in their valence shell. Thus, Mg is the diamagnetic element.
Are all elements and compounds pure substances?
Answer:
Yes
Explanation:
All elements and compounds are regarded as pure substances. Whereas mixtures are classified as impure substances.
The characteristics of pure substances are:
they have homogenous parts. they have a definite compositionthey cannot be easily broken or separated by physical meansthey have unique sets of physical properties.These characteristics perfectly fits those of elements and compounds.
Which of the following pH numbers indicates a strong alkali?
a. 1
b. 5
c. 7
d.) 14
Answer:
1 is the correct answer of the question
what is the volume in liters at STP of 14.5 grams of CO2 gas
Answer:
7.38 Liters
Explanation:
moles CO2 = 14.5g/44g/mol = 0.33 mole
At STP 1 mole of any gas occupies 22.4 Liters.
∴0.33 mole CO2 x 22.4 L/mol = 7.38 Liters
6. Think of some other chemical reactions. List them and the type of reaction: exothermic or endothermic. Example: Burning coal - exothermic
Remember: energy is conserved in a chemical reaction (visualize the reaction and question whether heat lies on reactant side (left) or product side (right))
-exothermic- heat is released (heat is on the product side)
>forming an ionic lattice (SALT)- mixture of Na and Cl results in a more stable ionic lattice, causing this reaction to be exothermic
>burning wood
-endothermic- heat is absorbed (heat is on the reactant side)
> cooking an egg
Which phrase describes gravitational attraction?
how heavy an object feels
the amount of matter in an object
how objects respond to changes in mass
the pull between objects with mass
The phrase which best describes gravitational attraction is the pull
between objects with mass.
What is Gravitational attraction?Gravitational attraction is the attraction which occurs between two objects
with mass. The force of attraction has a magnitude which is directly
proportional to the masses of the two objects and inversely proportional to
the square of the distance between the two objects.
This is the reason why option D i9s the most appropriate option as it deals
with pull or attraction.
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