The correct answer is D
Answer:
It was frozen.
Explanation:
A substance may undergo any chemical change in its nature in all the given cases except when it is frozen.
A) during heating there is chances that it undergoes decomposition . Like if calcium carbonate is heated it converts to calcium oxide and carbon dioxide.
B) When a compound is hit with a hammer there is chance of its chemical decomposition.
C) If a compound is placed in a salt solution it may react with the salt or water.
D) However freezing is purely a physical process, where contact with any other compound or any chance of chemical decomposition is not possible.
A gas occupies volume of 30 milileters at 273 K if the temperature is increased to 364 k while the pressure remains constant what will be the volume of the gas
Answer:
40 mL
Step-by-step explanation:
The pressure is constant.
The only variables are volume and temperature, so we can use Charles’ Law.
V₁/T₁ = V₂/T₂ Multiply each side by T₂
V₂ = V₁ × T₂/T₁
V₁ = 30 mL; T₁ = 273 K
V₂ = ?; T₂ = 364 K
V₂ = 30 × 364/273
V₂ = 40 mL
Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?
Answer : The correct option is, Malleable, shiny, and able to conduct heat or electricity.
Explanation:
Metals : Metals are the elements which can easily loose electrons and forms cations.
Properties of metals :
They are lustrous (shine).They are malleable and ductile (flexible).They conduct heat and electricity.The metallic oxides are basic in nature. They form cations in an aqueous solution.Non-metals : Non-metals are the elements which can easily gain electrons and form an anion.
Properties of non-metals :
They are non-lustrous.They are brittle and hard in nature.They do not conduct heat and electricity.The non-metallic oxides are acidic in nature. They form anions in an aqueous solution.Hence, from the given options the correct option for metal is, Malleable, shiny, and able to conduct heat or electricity.
Answer:
Malleable, shiny, and able to conduct heat or electricity
Hope this helps! :D
Explanation:
How do properties, such as Density, help us to classify and identify matter?
Density can be defined in terms of the mass of a substance present in a certain volume.
i.e. Density = Mass/ volume
It helps classify and identify matter due to the following reasons:
1) Density is an intensive property. For a given substance the density will remain the same irrespective of the amount in which it is present.
For example: The density of Aluminum (Al) = 2.7 g/cm3. This value is a constant at a certain temperature and pressure. Therefore, the density will remain the same for 1 kilogram or 1 mg of Al
2) Different elements/compounds have different values of densities which is characteristic of that substance
For the following reaction if you have 13.2g of CO and 42.7g of Fe2O3, which is the limiting reagent with regards to the Fe production? Fe2O3(s) + 3CO (g) —> 2Fe(s) + 3 CO2 (g)
Answer: CO is a limiting reagent with regards to the Fe production.
Explanation:
[tex]Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)[/tex]
Moles of CO = [tex]\frac{\text{mass of CO}}{\text{molar mass of CO}}=\frac{13.2 g}{28 g/mol}=0.4714 mol[/tex]
moles of [tex]Fe_2O_3=\frac{\text{mass of} Fe_2O_3}{\text{molar mass of}Fe_2O_3}=\frac{42.7 g g}{159.7 g/mol}=0.2673 mol[/tex]
According to reaction , 3 mole of CO reacts with 1 mole of [tex]Fe_2O_3[/tex] then , 0.4714 moles of CO will react with : [tex]\frac{1}{3}\times 0.4714 [/tex] moles of [tex]Fe_2O_3[/tex] that is 0.1571 moles.
0.4714 moles of CO will react with 0.1571 moles of [tex]Fe_2O_3[/tex] which means that CO is present in limited amount acting as limiting reagent.
Mole remaining of [tex]Fe_2O_3[/tex] = 0.2673 mol - 0.1571 mol = 0.1102 mol
Hence, CO is a limiting reagent and [tex]Fe_2O_3[/tex] is an excessive reagent.
A metal has higher reactivity than mag esoum where would the metal be on a periodic table
Answer is: below magnesium in group 2 or in group 1 (left from magnesium).
Reactivity series is an empirical progression of a series of metals, arranged by their reactivity from highest to lowest (alkaline metals have highest reactivity and Noble metals lowest reactivity).
This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.
Sodium and potassium (group 1 - alkaline metal) are more reactive than magnesium.
Strontium and barium (group 2 in periodic table) are higher in this group from magnesium. Strontium is stronger reducing agent than magnesium, gives electrons easier.
In the formula for water (H2O), what does the subscript 2 indicate?
the answer is actually "Two hydrogen atoms in the compound" >.>
which kind of covalent bond has unequal sharing of electrons
A polar covalent bond apex!
The type of covalent bond with unequal sharing of electrons is a polar covalent bond. This occurs when one atom in the bond has a stronger attraction for electrons, creating region of slight positive and negative charges.
Explanation:The type of covalent bond that has unequal sharing of electrons is referred to as a polar covalent bond. Covalent bonds occur when two nonmetals share electrons in order to achieve a full outer energy level. However, sometimes these electrons are not shared equally because one of the atoms has a stronger attraction for electrons - we call this atom more electronegative. The most electronegative atom pulls the electrons closer to itself, causing a slight negative charge in its area and a slight positive charge in the other area, hence it is called a polar covalent bond.
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explain why subscripts cannot change when balancing a chemical equation
not be changed to balance an equationSubscripts are part of the chemical formula for reactants or products and can
Changing a subscript changes the substance represented by the formula
Subscripts are the identity of the element (the number of atoms) whereas coefficients are the number of molecules of the element.
If you change the subscript, you change the number of atoms an element has. This changes the entire element since each element in the periodic table have different atomic numbers.
Question: Draw a valid Lewis structure for the molecule CH3NO in which there are no nonzero formal charges on any of the atoms. This structure should not include any bonds between N and O.
what do you do with the oxygen?
The mentioned molecule with formula, CH₃NO where no bond is found between N and O can be depicted as formamide is shown in the attachment below.
The formal charges = Number of valence electrons for the atom (V) - the number of electrons in lone pairs (N) - 1/2 (number of electrons in bond pairs, B)
FC = V - N - B/2
Thus, there is a need to calculate valence electrons, electrons in lone pairs, and the number of electrons in bond pairs for each atom in the mentioned molecule.
V or valence electrons on C = 4e, on H = 1e, on N = 5e, and on O = 6e.
N or electrons in lone pairs on C = 0e, on H = 0e, on N = 2e, and on O = 4e.
B or number of electrons in bond pairs for C = 8e, for H = 2e, for N = 6e, and for O = 4e.
Thus, the formal charges for each will be,
C = 4 - 0 - (8/2) = 0
H = 1 - 0 - (2/2) = 0
N = 5 - 2 - (6/2) = 0
O = 6 - 4 - (4/2) = 0
Lewis dot structure for the given molecule is given in the attachment below:
Answer : The Lewis-dot structure of [tex]CH_3NO[/tex] is shown below.
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is, [tex]CH_3NO[/tex]
As we know that carbon has '4' valence electrons, hydrogen has '1' valence electron, nitrogen has '5' valence electrons and oxygen has '6' valence electrons.
Therefore, the total number of valence electrons in [tex]CH_3NO[/tex] = 4 + 3(1) + 5 + 6 = 18
According to Lewis-dot structure, there are 12 number of bonding electrons and 6 number of non-bonding electrons.
Now we have to determine the formal charge for each atom.
Formula for formal charge :
[tex]\text{Formal charge}=\text{Valence electrons}-\text{Non-bonding electrons}-\frac{\text{Bonding electrons}}{2}[/tex]
[tex]\text{Formal charge on O}=6-4-\frac{4}{2}=0[/tex]
[tex]\text{Formal charge on C}=4-0-\frac{8}{2}=0[/tex]
[tex]\text{Formal charge on N}=5-2-\frac{6}{2}=0[/tex]
[tex]\text{Formal charge on }H_1=1-0-\frac{2}{2}=0[/tex]
[tex]\text{Formal charge on }H_2=1-0-\frac{2}{2}=0[/tex]
[tex]\text{Formal charge on }H_3=1-0-\frac{2}{2}=0[/tex]
Hence, the Lewis-dot structure of [tex]CH_3NO[/tex] is shown below.
in sexual reproduction, of each chromosome in a pair has the same genes, how is genetic variety possible?
This answer will depend on if you are speaking about asexual reproduction or not.
Variety is possible here because the the product genes are half from the mother and half from the father. So a child might have blue eyes from his mother, but red hair from his father, etc. Different genetic mutations are the initial cause of all differentiation between genes, which are passed down from each generation to the next through this same process.
In Asexual reproduction, all reproductions are essentially clones of the parent, and no genetic variation, other than mutations will occur.
Punnet Squares, they are charts to determine genetic variation by genotype and phenotype :)
What are the atomic number and mass number of this atom
For a 0.50 molal solution of sucrose in water, calculate the freezing point and the boiling point of the solution.
Answer:
-0.93 °C; 100.26 °C
Step-by-step explanation:
(a) Freezing point depression
The formula for the freezing point depression ΔT_f is
ΔT_f = iKf·b
i is the van’t Hoff factor: the number of moles of particles you get from a solute.
For sucrose,
Sucrose (s) ⟶ sucrose (aq)
1 mole sucrose ⟶ 1 mol particles i = 1
ΔT_f = 1 × 1.86 × 0.50
ΔT_f = 0.93 °C
T_f = T_f° - ΔT_f
T_f = 0.00 – 0.93
T_f = -0.93 °C
(b) Boiling point elevation
The formula for the boiling point elevation ΔTb is
ΔTb = iKb·b
ΔTb = 1 × 0.512 × 0.50
ΔTb = 0.256 °C
Tb = Tb° + ΔTb
Tb = 100.00 + 0.256
Tb = 100.26 °C
Answer:
Explanation:
1. If the Kf = 1.86 ºC / m for water, what is the freezing point depression for the sucrose solution?
ΔT = iKf m
i=1 for sucrose
Kf = 1.86 ºC / m
m = 0.50
ΔTf = 1.86 x 0.50 = 0.93 ºC
2. If the Kb = 0.512 ºC / m for water, what is the boiling point elevation for the sucrose solution?
ΔT = i Kb m
i=1 for sucrose
Kf = 0.512 ºC / m
m = 0.50
ΔTf = 0.512 x 0.50 = 0.26 ºC
AgI + Na2S Ag2S +NaI=
The equation needs to be balanced and written as,
[tex]2AgI+1 Na_{2} S[/tex]→[tex]1Ag_{2} S+2NaI[/tex]
Both side of compound should contain equal masses.
Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
B) mol
C) m
D) M
Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
A) kg is your answer
"Mass" is weight without gravity, and so the SI unit would also use the weight measurement. (You solve by dividing the force of gravity from the total weight to get mass.)
~
When molecules slow down, they expand.
A
True
B
False
False. <--- This is wrong I was thinking of atoms
Molecules do expand when they slowdown...
Hello.
The answer: A. True.
When mouecules slow down they can expend and this is how gas is made.
Have a nice day.
A substance which produces hydroxide ions when placed in water is a(n) _____.
A:dehydrate
B:base
C:solvent
99 points to whoever best answer.
The answer you're looking for is B:base
The base is disestablished in the water, and the molecules form into ions and produces OH- ions.
Like your profile picture
Hope this helped:D
Question: A substance which produces hydroxide ions when placed in water is a _____.
Answer: base
Explanation: a substance that contains hydrogen causes to produce hydrogen ions
question answered by
(jacemorris04)
If an automobile travels at 30. m/s for 2 minutes, how far has the car traveled?
3600 miles! to get this answer you first need to know that
60+60= 120
then just times tht by 30 and you get 3600!
Final answer:
The car traveling at a constant speed of 30.0 m/s for 2 minutes covers a distance of 3600 meters.
Explanation:
To calculate the distance traveled by a car that moves at a constant speed, we can use the formula distance = speed × time. Given that the car travels at a constant speed of 30.0 m/s for 2 minutes, we first need to convert the time from minutes to seconds since the speed is given in meters per second.
There are 60 seconds in a minute, so 2 minutes equals 2 × 60 = 120 seconds.
Now, we can calculate the distance:
Distance = Speed × Time
Distance = 30.0 m/s × 120 s
Distance = 3600 meters
Therefore, the car has traveled a distance of 3600 meters.
What is true of a decomposition reaction? The reactants are usually a metal and a nonmetal. The reactants are generally two ionic compounds in an aqueous solution. The addition of energy in the form of heat or electricity is often required. Water is usually one of the reactants.
Answer
In a true decomposition reaction, the addition of energy in the form of heat or electricity is often required.
Explanation
A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat or electricity to facilitate the breaking-down of the chemical bonds.
Answer:
The addition of energy in the form of heat or electricity is often required.
Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) In a particular experiment, 4.00-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.
6.69 g.
ExplanationMake sure the chemical equation is balanced:
[tex]6\; \text{Li}\; (s) + \text{N}_2 \; (g) \to 2\; \text{Li}_3\text{N}\; (s)[/tex]
Assuming that one mole of N₂ is consumed. How many grams of each reactant will that take? Refer to a periodic table for data on atomic mass.
6 × 6.94 = 41.64 grams of Li;1 × (2 × 14.01) = 28.02 grams of N₂.4.00 grams of each reactant are available. How many moles of N₂ can they consume?
4.00 grams of Li will lead to up to 4.00 / 41.64 = 0.09606 moles of the reaction.4.00 grams of N₂ will lead to up to 4.00 / 28.02 = 0.1428 moles of the reaction.However, only 0.09606 moles of the reaction is possible, since Li would have ran out before all 4.00 grams of N₂ are used up.
Each mole of the reaction makes 2 moles of Li₃N. 0.09606 moles of the reaction will produce 0.09606 × 2 × (3 × 6.94 + 14.01) = 6.69 grams of Li₃N.
What is the volume(in liters at stp) of 2.50 mil of carbon monoxide
The volume of one mole of substance is 22.4 L
To find the volume of 2.50 moles of carbon monoxide at STP, you multiply the moles by the molar volume at STP (22.4 L/mol), which gives you 56.0 liters.
To calculate the volume of carbon monoxide (CO) at standard temperature and pressure (STP), we should use Avogadro's Law. At STP, one mole of any gas occupies 22.4 liters. Given the amount of carbon monoxide in moles, we can determine the volume it would occupy at STP.
To find the volume:
Volume at STP (V) = Number of moles (n) x Molar volume at STP (Vm)
We know that:
[tex]n = 2.50\ moles\\ V_m = 22.4\ L/mol\ (volume\ occupied\ by\ one\ mole\ of\ gas\ at\ STP)[/tex]
So:
[tex]V = 2.50\ moles \times 22.4\ L/mol\\ V = 56.0\ liters[/tex]
This is the volume of 2.50 moles of carbon monoxide gas at standard temperature and pressure.
What salt is formed by the reaction of potassium hydroxide and hydrochloric acid?
Potassium hydroxide (KOH) is formed when Potassium forms ionic bonds with OH-ions while Potassium Oxide (K2O) is formed when potassium forms ionic bonds with the Oxide (O2-) ions. i.e. This reaction is a neutralization reaction and occurs when an acid (HCl) reacts with a base (KOH).
Answer: potassium chloride
Explanation:
Double displacement reaction is one which involves exchange of ions. Neutralization is a type of double displacement reaction in which an acid combines with a base to form salt and water, the reaction is called as neutralization reaction.
[tex]KOH+HCl\rightarrow KCl+H_2O[/tex]
Thus the salt formed is potassium chloride which has the chemical formula [tex]KCl[/tex].
Hey can you please help me with this I really need y’all
24 g of magnesium were burned in oxygen. The compound formed had a mass of 40 g. Explain why the mass had gone up.
Answer :
According to the law of conservation of mass, the mass of reactants must be equal to the mass of products.
The balanced chemical reaction is,
[tex]Mg+\frac{1}{2}O_2\rightarrow MgO[/tex]
As we know that the molar mass of magnesium is 24 g/mole, the molar mass of [tex]O_2[/tex] is 32 g/mole and the molar mass of magnesium oxide is 40 g/mole.
From the given balanced reaction, we conclude that
As, 1 mole of magnesium react [tex]\frac{1}{2}[/tex] mole of oxygen to give 1 mole of magnesium oxide.
So, the mass of Mg is 24 g, the mass of [tex]O_2=\frac{1}{2}\times 32=16g[/tex] and the mass of MgO is 40 g.
That means 24 g of Mg react with 16 g [tex]O_2[/tex] to give 40 g of MgO.
The mass increased when magnesium burnt in oxygen because magnesium combines with oxygen to form magnesium oxide. This compound is heavier than the original magnesium because it includes the mass of both magnesium and oxygen.
Explanation:The mass increased when 24 g of magnesium was burnt in oxygen because magnesium combines with oxygen in the air to form a compound. This is fundamentally due to magnesium's affinity for oxygen. The resulting compound, magnesium oxide (MgO), has a higher mass because it combines the masses of both magnesium and oxygen. The reaction can be written as: 2Mg(s) + O2(g) → 2MgO(s). Here, oxygen from the air adds additional mass, resulting in a final product that is heavier than the original magnesium.
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is P2I4 or Diphosphorus tetraiodide covalent or ionic?
Diphosphorus tetraiodide is a covalent compound.
It has low melting point as compared to ionic compounds
It is a rare compound where the oxidation state of Phosphorous is +2.
It is also termed as subhalide of phosphorous.
Answer: covalent bond.
Explanation:
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.
As [tex]P_2I_4[/tex] or Diphosphorus tetraiodide is made up of phosphorous and iodine which are both non metals , it is a covalent bond.
List the 3 ways carbon can enter the ocean?
Final answer:
Three ways carbon can enter the ocean are through running water, atmospheric dissolution, and decomposition of aquatic organisms.
Explanation:
Carbon can enter the ocean through three main ways:
Running water: Carbon is slowly dissolved in rocks by running water and eventually ends up in the ocean.Atmospheric dissolution: The top layer of ocean water dissolves some carbon dioxide out of the atmosphere.Decomposition of aquatic organisms: Carbon enters ocean water from the decomposition of aquatic organisms.Write a balanced equation for double replacement of KOH+ZnCl2
Answer :
Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as a product.
[tex]AB+CD\rightarrow AD+CB[/tex]
In this, A and C are the cations and B and D are the anions.
When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.
The balanced chemical reaction is,
[tex]KOH+ZnCl_2\rightarrow Zn(OH)_2+2KCl[/tex]
iron plus lead (||)sulfate react forming iron (||) sulfate plus lead
Final answer:
Fe(s) + PbSO4(s) = FeSO4(aq) + Pb(s)
Explanation:
The question involves a reaction where iron reacts with lead (II) sulfate, resulting in the formation of iron (II) sulfate and lead. This type of reaction is a single displacement reaction where a more reactive metal (iron) displaces a less reactive metal (lead) from its compound. To balance the reaction, we would write it as:
Fe(s) + PbSO4(s) = FeSO4(aq) + Pb(s)
Here, solid iron reacts with solid lead (II) sulfate to produce aqueous iron (II) sulfate and solid lead. This reaction is guided by the activity series, which predicts whether certain chemical reactions will occur based on the reactivity of the metals involved. In this case, since iron is more reactive than lead, it can displace lead from its sulfate compound.
how many individual atoms make up one unit of aluminum chloride, ALCL3?
4 atoms make up aluminium chloride: 1 aluminum atom and 3 chlorine atoms
Determine the heat given off to the surroundings when 9.873 g of aluminum reacts according to the equation 2Al + Fe2O3 → Al2O3 + 2Fe, ΔH°rxn= -849.1 kJ/mol.
Answer : The heat given off to the surroundings will be, -155.38 KJ
Solution : Given,
[tex]\Delta H^o_{rxn}=-849.1KJ/mole[/tex]
Mass of aluminium = 9.873 g
Molar mass of aluminium = 27 g/mole
First we have to calculate the moles of aluminium.
[tex]\text{ Moles of Al}=\frac{\text{ Mass of Al}}{\text{ Molar mass of Al}}=\frac{9.873g}{27g/mole}=0.366moles[/tex]
The given balanced reaction is,
[tex]2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe[/tex]
From the reaction, we conclude that
2 moles of aluminum releases heat energy = -849.1 KJ
0.366 moles of aluminium releases heat energy = [tex]\frac{-849.1KJ}{2moles}\times 0.366moles=-155.38KJ[/tex]
Therefore, the heat given off to the surroundings will be, -155.38 KJ
between sour soup,melting of candle wax,rusting, and burning which is not a chemical reaction
Sour soup is not a chemical reaction