Answer:
Explanation:
8) As a sulfur atom gains electrons, its radius
A) decreases
B) increases
C) remains the same
Answer:
Increases
Explanation:
when an atom form ion its atomic radius changed from neutral atomic radius.
if the atom form cation its atomic radius is smaller than neutral atomic radius.
If atom form anion its anionic radius is larger than the neutral atomic radius.
The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.
when sulfur gain electrons it form anion that's why its radius increases.
9) Which element forms an ion larger than its atom?
A) Na B) Ne C) Ba D) Br
Answer;
Br
Explanation:
when an atom form ion its atomic radius changed from neutral atomic radius.
if the atom form cation its atomic radius is smaller than neutral atomic radius.
If atom form anion its anionic radius is larger than the neutral atomic radius.
The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.
In given list of elements sodium and barium form cation while bromine form anion.
That's why anion of bromine is larger than atom.
while neon is inert it cannot form ion.
10. Which of the following particles has the smallest
radius?
A) Na B) K° C) Na+ D) K+
Answer:
Na⁺
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased .
Sodium and potassium are present in group one. Sodium is present in period three while potassium is present in period four. So atomic size of sodium is smaller and when it form the cation its cation is smaller than its atom because of losing of electron.The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii
suppose work input is 25 j and the output distance is 10 m factoring in the effect of friction which must be true about output force a) it equals 2.5n b) it is less than 2.5n c) it is greater than 2.5n
Answer:
Therefore F ∠ 2.5N
Explanation:
Definition of Work:
It is the amount of energy transferred.
Mathematical expression:
W = F × d
By taking the friction into count it will define as:
Input work = work against friction × output work
No we will put the values:
25 J = w + 10 m
j = kg m²/s²
25 kg m²/s² = w + 10 m
when friction is exist then w > 0
25 kg m²/s² - 10 m > 0
15 N > 0
Therefore F ∠ 2.5N
a rectangular solid of unknown density is 5 meters long, 2 meters high, and 4 meters wide. The mass of this solid is 300 grams. Given this information for this homogeneous material, calculate the density.
Answer:if you could be more spesific id be happpy to help
Explanation:
thanks sm.
Answer:
The density of the material is 7.5 g/m^3
Explanation:
The volume of a rectangle is:
Volume = Length*Height*Width
Replacing with data:
Volume = 5 m * 2 m * 4 m = 40 m^3
Density is computed as follows:
Density = Mass/Volume
Replacing with data:
Density = 300 g/40 m^3
Density = 7.5 g/m^3
Volume is the quantity of two-dimensional space occupied by a liquid, solid, or gas.
a. True
b. False
Answer:
B.False
Explanation:
Volume is used in 3D shapes, 2D is found by area.
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If you are given an ideal gas with pressure (P) = 259,392.00 Pa and temperature (T) = 2.00 oC of 1 mole Argon gas in a volume of 8.8 dm3 , calculate R to the correct number of significant figures and units under given condition
Answer:
R = 0.064 dm³ atm K⁻¹ mol⁻¹
Explanation:
Data Given:
volume of gas V = 8.8 dm³
no. of mole of gas (n) = 1 mole
Pressure P = 259,392.00 Pa
Convert Pascal (Pa) to atm (atmospheric pressure)
As,
101,325 Pa = 1 atm
So,
259,392.00 Pa = 2 atm
Then Pressure (P) = 2 atm
Temperature T = 2.00 °C
change the temperature from °C to K
As to convert °C to K the below formula used
0°C + 273.15 = 273.15K
So, for 2 °C
2°C + 273.15 = 275.15 K
So,
Temperature T = 275.15 K
ideal gas constant = ?
formula used for Ideal gases
PV = nRT
as we have to find R of the gas:
we will rearrange the ideal gas equation as below:
R = PV / nT ........................................... (1)
Put value in equation (1)
R = 2atm x 8.8 dm³ / 1 mole x 275.15 K
R = 17.6 atm. dm³ / 275.15 mol. K
R = 0.064 dm³ atm K⁻¹ mol⁻¹
So the value of R is 0.064 dm³ atm K⁻¹ mol⁻¹
and the unit of R (ideal gas constant) is dm³ atm K⁻¹ mol⁻¹
If you are given an ideal gas with pressure (P) = 259,392.00 Pa and temperature (T) = 2.00 oC of 1 mole Argon gas in a volume of 8.8 dm3 , calculate R to the correct number of significant figures and units under given condition
Answer:
R = 0.083 atm .L / mol.K
Explanation:
Given data:
Pressure of gas = 259,392.00 Pa
Temperature = 2.0 °C
Moles = 1 mol
Volume = 8.8 dm³
R = ?
Solution:
First of all we will convert the units.
Pa to atm
259,392.00 /101325 = 2.56 atm
dm³ to L
8.8 dm³ = 8.8 L
2.0 °C to K
2+273 = 275 K
Now we will calculate the R:
PV = nRT
R = PV/ nT
R = 2.56 atm . 8.8 L / 1 mol. 275 K
R = 22.528 atm .L / 1 mol. 275 K
R = 0.083 atm .L / mol.K
1. What is a Lucas reagent?
Final answer:
A Lucas reagent is a mixture of zinc chloride and concentrated hydrochloric acid that is used to distinguish between primary, secondary, and tertiary alcohols.
Explanation:
A Lucas reagent is a mixture of zinc chloride (ZnCl2) and concentrated hydrochloric acid (HCl) that is used to distinguish between primary, secondary, and tertiary alcohols.
When the Lucas reagent is added to an alcohol, a reaction occurs where a cloudy precipitate of alkyl chlorides is formed. The rate at which the precipitate forms depends on the type of alcohol:
Primary alcohols react slowly and may not produce a visible precipitate for several minutes or even hours.Secondary alcohols react more quickly and typically produce a visible precipitate within a few minutes.Tertiary alcohols react very rapidly and often produce an immediate, milky-white precipitate.can somebody help with parts c and d
Answer:
13. Na 14. Ne. 15. U. 16. Ca. 17. C. l 18. O. 19. Cl. 20. Si 21. U 22. N.
23. Na 24. Ne. 25. U 26. Sc. 27. N 28. O 29. Cl 30. Si 31. U 32. N.
Explanation:
The general trend as you go to the right in any one period is for the size to decrease.
The general trend is that the size increases as you go down a Group.
The general trend as you go from the bottom left to the top right is a decrease in size.
Ionization energy increases as we move to the right in a period.
It decreases as we move down a group.
Going from the bottom left to top right - the ionization increases.
2. Write the formula or name for the following
compounds:
a. P205
b. CCl2
c. boron trichloride
d. dinitrogen tetrahydride
Answer:
Diphosphorus pentoxide
Carbon dichloride
BCl3
N2H4
Explanation:
These are all covalent compounds. To name covalent compounds, you add prefixes to the beginning of their names depending on what the subscript is of each element. The prefixes are:
1: Mono
2: Di
3: Tri
4: Tetra
5: Penta
6: Hexa
7: Hepta
8: Octa
9: Nona
10: Deca
For example, since the first one is Phopsphorus with a 2 next to it, you add the prefix Di to it.
If the first element in the compound only has one, meaning no number next to it, you do not say mono. This is why we just say "Carbon" for the second one instead of "Monocarbon."
Finally, you always have to end the second element in the compound with "ide." So, "chlorine" becomes "chloride," "oxygen" becomes "oxide," and so on.
3. How many more troops did the Union states have than the Confederate states?
Esterification reaction of benzoic acid with ethanol in presence of concentrated sulphuric acid
Answer:
ester C6H5CH2OC2H5 is formed.
Explanation:
C6H5CH2OH + C2H5OH ---> C6H5CH2OC2H5 + H2O
Esterification reaction of benzoic acid with ethanol in presence of concentrated sulfuric acid is C₆H₅CH₂OH + C₂H₅OH → C₆H₅CH₂OC₂H₅ + H₂O.
What is an esterification ?Esterification is the process of combining an organic acid (RCOOH) with an alcohol (ROH) to produce an ester (RCOOR) and water, or a chemical reaction that produces at least one ester product. Ester is formed by the esterification of an alcohol and a carboxylic acid.
An acid catalyst, typically sulfuric acid, is added to speed up the reaction while also acting as a dehydrating agent.
Benzoic acid (a carboxylic acid) is esterified with methanol (an alcohol) in the presence of sulfuric acid (an acid catalyst) in this Fischer esterification reaction to produce methyl benzoate (an ester).
Thus, C₆H₅CH₂OH + C₂H₅OH → C₆H₅CH₂OC₂H₅ + H₂O.
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Planes X and Y and points C, D, E, and F are shown.
Vertical plane X intersects horizontal plane Y. Point D is on the left half of plane Y. Point F is on the bottom half of plane X. Point E is on the right half of plane Y. Point C is above and to the right of the planes.
Which statement is true about the points and planes?
The line that can be drawn through points C and D is contained in plane Y.
The line that can be drawn through points D and E is contained in plane Y.
The only point that can lie in plane X is point F.
The only points that can lie in plane Y are points D and E.
Answer:
The line drawn through points D and E.
Explanation:
Y is a horizontal line and D and E are both on the same line. If a line were drawn it would be within the Y plane.
Answer:
B. The line that can be drawn through points D and E is contained in plane Y.
Explanation:
What is the formula of the hydrated calcium sulfate, i.e., what is the whole number mole ratio of calcium sulfate to water?
(Can you answer quickly. I have exam tomorrow :)
Chemical formula of calcium sulfate dihydrate: CaSO₄ · 2 H₂O
There is a 1 : 2 mole ratio between calcium sulfate and water.
Explanation:
The calcium sulfate may be find as an anhydrous salt or a dihydrate. In the case of the dihydrate the chemical formula is CaSO₄ · 2 H₂O.
In the calcium sulfate dihydrate there are 1 mole of CaSO₄ and 2 moles of H₂O, so the mole ratio between the salt and the water molecules is 1 : 2.
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Final answer:
The hydrated form of calcium sulfate, also known as gypsum, has a chemical formula of CaSO4·2H2O, indicating a 1:2 mole ratio of calcium sulfate to water.
Explanation:
The hydrated form of calcium sulfate is commonly known as gypsum, and its chemical formula is CaSO4·2H2O. This indicates that there is a whole number mole ratio of 1:2 between calcium sulfate and water. Hydrates are compounds that include water molecules absorbed into their structure, and this absorbed water plays an essential role in the physical properties of the material. In the case of gypsum, the two water molecules are crucial for its use in construction and medical applications, such as in plaster of Paris.
a. A 3.24 M solution of base is Diluted by adding water increasing its volume from 1.25 L to 3.98 L. Calculate the new Molarity of the solution
B. 270 mL of a 7.0 M NaHCO3 solution was used in the preparation of 1.9 L of diluted NaHCO3. what is the molarity of the diluted solution
C. what volume of 5 M NaOH is needed to create a 100 mL solution of 1 M NaOH?
PLEASE HELP ILL GET 30 EXTRA POINTS FOR THESE
Answer:
A. The new molarity of the diluted solution is 1.0176 M
B. The new molarity of the diluted solution is 0.9947 M
C. 20 mL of volume is required to prepare 100ml of 1 M NaOH
Explanation:
Part A:
___________
This problem will be solved by using the following formula
M₁V₁ = M₂V₂ (1)
Given Data:
Initial Molarity of Solution M₁ = 3.24 M
Initial volume V₁ = 1.25 L
Initial volume V₂ = 3.98 L
Final Molarity M₂= ?
Put the values in formula 1
3.24 M x 1.25 L = M₂ x 3.98 L
By Rearranging
M₂ = 3.24 M x 1.25 L / 3.98 L
M₂ = 4.05 / 3.98
M₂ = 1.0176 M
The new molarity of the diluted solution is 1.0176 M
_________________
Part B:
This problem will be solved by using the following formula
M₁V₁ = M₂V₂ (1.1)
Given Data:
Initial Molarity of Solution M₁ = 7.0 M
Initial volume V₁ = 270 mL
As the initial volume is in ml and final volume in Litre (L)
So we have to convert mL to L
1000ml= 1L
270 ml = ? L
1 x 270/ 1000 = 0.27 L
So
Initial volume V₁ = 0.27 L
Initial volume V₂ = 1.9 L
Final Molarity M₂= ?
Put the values in formula 1.1
M₁V₁ = M₂V₂
7.0 M x 0.27 L = M₂ x 1.9 L
By Rearranging
M₂ = 7.0 M x 0.27 L / 1.9 L
M₂ = 1.89 / 1.9
M₂ = 0.9947 M
The new molarity of the diluted solution is 0.9947 M
_________________
Part 3
This problem will be solved by using the following formula
M₁V₁ = M₂V₂ (1.2)
Given Data:
Initial Molarity of Solution M₁ = 5 M
Initial volume V₁ = ? mL
Initial volume V₂ = 100 mL
Final Molarity M₂= 1 M
Put the values in formula 1.2
M₁V₁ = M₂V₂
5 M x V₁ = 1 M x 100 mL
By Rearranging
V₁ = 1 M x 100 mL/ 5 M
V₁ = 100 / 5
V₁ = 20
20 mL of volume is required to prepare 100ml of 1 M NaOH
What is the percentage error if the experimental
value is equal to the accepted value?
Final answer:
If the experimental value equals the accepted value, the percentage error is 0%, indicating perfect accuracy in the measurement.
Explanation:
When the experimental value of a measurement precisely matches the accepted value, the percentage error is 0%. This indicates that there is no discrepancy between the measured value and the standard or true value. Percentage error is a way to express the accuracy of an experimental measurement and is calculated using the formula: |experimental value - accepted value| × 100% / accepted value.
Therefore, if both values are equal, the formula results in 0%. As the accuracy of a measurement decreases, signified by a larger discrepancy between the experimental and accepted values, the percentage error correspondingly rises. Reporting the percentage error is critical for underscoring the reliability and precision of an experiment's results.
2. When atoms are heated so that they emit light, what characteristic of their light
allows you to tell one atom from another?
Answer:
The color of the light.
Explanation:
When an atom is heated, its electrons are excited and they jump to higher energy levels. The electrons will return to their normal energy level, and by doing this, they will emit a photon of energy, which is in the form of light. The color of the light depends on the difference of energy of the two levels, and because of that is different for each element.
Each atom emits light at different wavelengths that form its unique atomic emission spectrum when heated. By studying this spectrum, one can distinguish between different atoms. For example, hydrogen and helium atoms yield different spectral patterns due to the unique energy transitions in their electrons.
Explanation:When atoms are heated, they emit light consisting of many different colors or wavelengths, which is collectively referred to as an atom's spectral lines or spectrum. Every atom has a unique spectrum, equivalent to a 'fingerprint' because its electron energies are unique. This concept is called the atomic emission spectrum. Thus, by studying the spectrum emitted by an atom, we can tell one atom from another.
For instance, when hydrogen atoms are heated, they emit a specific spectral line that looks predominantly red because of the transitions that hydrogen's single electron makes. On the other hand, a helium atom's spectrum would look different, containing more diverse and vibrant colors due to the different energy transitions in its two electrons. By comparing the observed spectrum to known emission spectra, we can identify the type of atom.
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25. What type and how many atoms are in Fe2(SO4)3?
It total there are 18 atoms.
Iron (Fe) is a metal.
Sulfur (S) is a nonmetal.
Oxygen (O) is a nonmetal.
Explanation:
We have the chemical formula of iron (III) sulfate Fe₃(SO₄)₃.
It total there are 18 atoms, 3 iron (Fe) atoms, 3 sulfur (S) atoms and 12 oxygen (O) atoms.
Iron (Fe) is a metal.
Sulfur (S) is a nonmetal.
Oxygen (O) is a nonmetal.
Iron is found as Fe²⁺ cation while the sulfate group SO₄⁻ as an anion.
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There are a total of 17 atoms in Fe2(SO4)3.
A compound is formed when atoms of elements combine chemically together. A compound is defined as a group of elements which are chemically combined together.
In the compound Fe2(SO4)3, there are;
Two iron atomsthree sulfur atomstwelve oxygen atomsThis makes a total of 17 atoms in the compound Fe2(SO4)3. Iron is a metal while oxygen and sulfur are nonmetals.
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What substances react and form during oxidation
Answer:
carbon dioxide and water
Explanation:
ncompletely oxidized (in this sense, oxidation means the removal of electrons or hydrogen atoms), the end product being (apart from carbon dioxide and water)
Oxidation is the process of losing electron or reaction with oxygen. If the reactant burn in oxygen then it gives water and carbon dioxide and this type of oxidation is called combustion.
What is oxidation?Oxidation is the process of combining with oxygen or to lose electron to form the higher oxidation state. For example metals lose electrons forming their higher oxidation states. Fe lose its 2 electrons forming Fe²⁺ ion is an example of oxidation.
When a compound burns in oxygen it oxidizes to carbon dioxide and water, and the reaction is called combustion. Fuel gases such as hydrocarbons easily undergoes combustion reaction.
Similarly, organic molecules such as alcohols, ketones, aldehydes etc. undergo oxidation forming corresponding acids. The reagents which oxidizes other reactants is called oxidizing agent.
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Given 6 moles of CuCl2, how many moles of AlCl, were made? SHOW the math below
Answer:
6 moles of CuCl₂ will produced 4 moles of AlCl₃ .
Explanation:
Given data:
Moles of CuCl₂ = 6 mole
Moles of AlCl₃ produced = ?
Solution:
3CuCl₂ + 2Al → 2AlCl₃ + 3Cu
Now we will compare the moles of CuCl₂ with AlCl₃ .
CuCl₂ : AlCl₃
3 : 2
6 : 2/3 ×6 = 4 mol
So, 6 moles of CuCl₂ will produced 4 moles of AlCl₃ .
What is the mass percent of carbon in tryptophan
Explanation:
The formula for tryptophan is [tex]C_{11}H_{12}N_{2}O_{2}[/tex]
Mass of [tex]C[/tex] in tryptophan is [tex]11\times 12=132g[/tex]
Mass of [tex]H[/tex] in tryptophan is [tex]12\times 1=12g[/tex]
Mass of [tex]N[/tex] in tryptophan is [tex]2\times 14=28g[/tex]
Mass of [tex]O[/tex] in tryptophan is [tex]2\times 16=32g[/tex]
So,[tex]\text{total mass}=132+12+28+32=204g[/tex]
[tex]\text{mass of carbon}=132g[/tex]
[tex]\text{mass percent of carbon}=\frac{\text{mass of carbon}}{\text{total mass}}\times 100 =\frac{132}{204}\times 100 =64.7[/tex]%
Final answer:
The mass percent of carbon in tryptophan is approximately 64.68%, calculated by determining the total mass of carbon.
Explanation:
By using the atomic masses of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O), we can calculate the molar mass of tryptophan. After that, we determine the total mass contributed by carbon atoms (by multiplying the number of carbon atoms by the atomic mass of carbon) and then divide this by the molar mass of tryptophan to get the mass percent of carbon.
So, the mass of carbon in tryptophan is 11 × 12.01 g/mol = 132.11 g/mol.
The molar mass of tryptophan is approximately 204.23 g/mol. The mass percent of carbon in tryptophan can thus be calculated as (132.11 g/mol) / (204.23 g/mol) × 100%, which yields approximately 64.68%.
This value indicates that carbon makes up about 64.68% of the mass of a tryptophan molecule. Understanding these kinds of compositions is important for fields like biochemistry and nutrition where the analysis of the biochemical roles of various compounds is crucial.
Getting these when you’re young helps your immune system fight off diseases:
A. Bandages
B. Stickers
C. Shots (immunizations)
D. Cough drops
C
Immunization shots are given to ensure immunity against future attacks on the body against the disease in which the vaccine is made.
Explanation:
The vaccine prepares the body by giving immune cells memory against the disease agent. The vaccine achieves this by introducing an attenuated form of the agent of the disease into the body. This means the introduced disease agents cannot cause disease but are enough to evoke an immune response from the body. The immune system, after eradicating the attenuated disease agent from the body, acquires memory such that it fights a real-world disease agent in case of infection.
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The equation below shows lithium reacting with nitrogen to produce lithium nitride. 6Li + N2 2Li3N If 12 mol of lithium were reacted with excess nitrogen gas, how many moles of lithium nitride would be produced? 4.0 mol 6.0 mol 12 mol 36 mol
Answer:
4 mol of lithium nitride would be produced
Explanation:
6Li + N2 → 2Li3N
This equation means that 6 mol of lithium are reacted with 1 mol of nitrogen to make, 2 mol of lithium nitride.
So this is the rule of three to find out, how many moles of lithium nitride are been made, from 12 mol of Li.
6 Li _____ 2 Li3N
12 Li ________ (12. 2) / 6 = 4 moles
Answer:
4 mol of lithium nitride would be produced
Explanation:
6Li + N2 → 2Li3N
This equation means that 6 mol of lithium are reacted with 1 mol of nitrogen to make, 2 mol of lithium nitride.
So this is the rule of three to find out, how many moles of lithium nitride are been made, from 12 mol of Li.
6 Li _____ 2 Li3N
12 Li ________ (12. 2) / 6 = 4 moles
What's WO2 in empirical form?
Answer:
WO2:
Explanation:
If any element symbol in a formula has no subscript, implying a subscript of one, the formula is already empirical.
What are the coefficients of the equation below when it is balanced?
___ CaCl2 + ___ Na3PO4 ___ Ca3(PO4)2 + ___ NaCl
3,2,1,6
3,2,1,3
1,1,1,1
1,2,2,1
3, 2, 1, 6
Explanation:
To balance the chemical equation the number of atoms of each element
entering the reaction have to be equal to the number of atoms of each
element leaving the reaction, in order to conserve the mass.
In our case we have:
3 CaCl₂ + 2 Na₃PO₄ → Ca₃(PO₄)₂ + 6 NaCl
So the stoechiometric coefficients will be:
3, 2, 1, 6
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What evidence supports the idea that all the continents were once joined together? A. Similar rocks found on different continents. B. Mountains created by colliding continents. C. Evidence of glaciers in unexpected places. D. All of the above.
Similar rocks found on different continents, Mountains created by colliding continents, Evidence of glaciers in unexpected places are the evidences to support the idea that all the continents were once joined together.
Option D, All the above.
Explanation:Earth did not have seven continents but only one, nearly 300 million years ago. There was one "massive super continent", called the Pangaea. The Pangaea was also surrounded by the ocean named panthalassa. Experts say that the formation of the seven continents happened due to the movement in the tectonic plates.
Similar kinds of rocks were found on different continents, it is also believed that the Aps were formed due to the separation of continents, coal deposits of the same constituents were also found on different continents.
Answer:
all of the above
Explanation:
what is an example of a cation
what’s an example of a cation
Answer:
Mg+
Explanation:
Cation is an ion that has lost its electron(s).
So, it has a positive charge.
Any ion with a positive charge (superscript has a + sign) is a cation.
which element is most likely to gain electrons in a chemical reaction?
1) Kr
2) Br
3) Ca
4) Ba
The correct answer to the question is Option 2. Br
Electronegativity is simply defined as the ability of an atom to attract electron(s)
Non metals are more electronegative than metals.
Krypton, Kr is a group 18 element which have completely filled outermost shell. They do not involve in bond formation.
Calcium, Ca and Barium, Ba are group 2 metals. They form bond by losing their 2 valence electrons.
Bromine, Br is a group 17 element which have 7 valence electrons. It is difficult for Br to lose its valence electron(s) and as such, it will form bond by either gaining 1 electron or sharing 1 electron.
With the above information, we can conclude that Option 2. Br gives the correct answer to the question.
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A particular element has the following set of properties:
It has a low melting point.
It has a low boiling point
It exists as a two-atom molecule in the gas phase.
It has seven outer electrons.
It readily reacts with metals to produce a salt.
Which element does the list describe?
A. strontium (Sr)
B. potassium (K)
C. krypton (Kr)
D. bromine (Br)
Answer:
D. bromine (Br)
Explanation:
Bromine is an element of halogen group.
Halogens, or "salt-formers," are located in group 17 of the periodic table. The halogens have the following properties:
1) They have low melting points and low boiling points.
2) They exist as diatomic molecules in the gas phase.
3) They have seven electrons in their outermost shell, which means they have seven valence
electrons.
4) They are highly reactive nonmetals.
5) They tend to gain electrons and form negative ions.
Thus the given properties are of Bromine.
Concrete a mixture or pure substance?
Answer: Cement is a mixture.
Explanation: It is composed of different types of compound particles. Each of the components of concrete by themselves would be pure substances. For example, a sample of just calcium oxide would be a pure substance because the particles in the sample would all be identical calcium oxide compounds.
Concrete is a heterogeneous mixture comprised of cement, water, sand, and gravel, retaining the individual properties of its components and can be separated physically.
Explanation:Concrete is a mixture, not a pure substance. Pure substances are materials made up of only one type of matter, either a single element or a single compound, with a constant composition and set of properties throughout. In contrast, mixtures are combinations of two or more pure substances that retain their individual identities and can be separated by physical methods. Concrete is specifically a heterogeneous mixture as it consists of several different components such as cement, water, sand, and gravel that are not uniform throughout. These components can be identified and, in theory, could be separated by physical means.
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HELP PLEASE (Solve this problem using the appropriate law). what is the volume of 0.382 moles of hydrogen gas at 1.50 atmospheres pressure and a temperature of 295k?
(R=0.0821L•atm/mol•k)
6.17L
1.2L
3.08L
4.01L
0.23L
Answer:
V = 6.17 L
Explanation:
Given data:
Volume = ?
Number of moles = 0.382 mol
Pressure = 1.50 atm
Temperature = 295 k
R = 0.0821 L. atm. /mol. k
Solution:
According to ideal gas equation:
PV= nRT
V = nRT/P
V = 0.382 mol × 0.0821 L. atm. /mol. k ×295 k / 1.50 atm
V = 9.252 L. atm. / 1.50 atm
V = 6.17 L
Final answer:
Using the ideal gas law, the volume of 0.382 moles of hydrogen gas at 1.50 atmospheres pressure and 295 K is approximately 6.17 L.
Explanation:
Using the ideal gas law, PV = nRT, we can calculate the volume of 0.382 moles of hydrogen gas at 1.50 atmospheres pressure and 295 K temperature. where T is the temperature, R is the ideal gas constant, n is the number of moles, V is the volume, and P is the pressure.
The provided values are: P = 1.50 atm, n = 0.382 moles, R = 0.0821 L•atm/mol•K, and T = 295 K. When we enter these numbers into the ideal gas law, we obtain:
V = nRT/PV = (0.382 mol) × (0.0821 L•atm/mol•K) × (295 K) / (1.50 atm)
Calculating this, we find the volume (V) of hydrogen gas:
V ≈ 6.17 L
Which example is classified as a body fossil?
fossilized bird droppings
footprint of a stone-age
individual ancient shark vertebra
a worm trail
Answer:
individual ancient shark vertebra
Explanation:
it ask for a body fossil and that is the only body fossil
One of the example that falls under classification of body fossil is C:
individual ancient shark vertebra
Fossils can be regarded as preserved remains of some animals as well as plants, this could also include the traces of ancient organisms remains
The main types of fossil are:
true form fossil trace fossil mold fossilBody fossils can be regarded as type of fossil that is very common across the world. They are the fossils that are formed due to the remains of dead animals as well as plants.Most of the body fossils usually have a hard parts these part could be
teethwoody trunksbonesshellsTherefore, option C is right
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