Answer:
-8024.832 J
Explanation:
The amount of heat energy lost or released, Q, can be calculated thus;
Q = m × c × ∆T
Where;
Q = amount of heat lost (J)
m = mass of substance (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
According to this question,
Q = ?
m = 24.3 g
c of Gold = 0.129 J/g°C
∆T = 20°C - 2580.0°C = -2560°C
Using Q = m × c × ∆T
Q = 24.3 × 0.129 × -2560°C
Q = -8024.832 J
This means that 8024.832 J of energy is lost or released.
Calculate the molarity of the following solution: 1.0 mole of KCl in .75 L of solution.
1.3 M
2.0 M
0.750 M
99 M
Answer:
1.3 M
Explanation:
1 mole= Concentration * Volume
1 mole=C*0.75 L
C=1.3 M
Which causes genetic variations and can result in different alleles
Under what conditions is AG for a reaction always positive?
What is the two major types of chemical bonding?
Answer:
Ionic bond and covalent bond
Explanation:
The two main types of chemical bonding are ionic bond and covalent bond.
In an ionic bond, there is a transfer of electrons from one atom to another. Usually from a metal to a nonmetal leading to the existence of an ion pair. Ionic compounds are soluble in water and have high melting and boiling points due to the strong electrostatic interaction between ions in the compound.
A covalent bond involves sharing of electrons between atoms. In an ordinary covalent bond, the shared electrons are furnished by the two bonding atoms while in a dative covalent bond, the two bonding electrons are furnished by only one of the bonding species.
the name of the compound made from lithium chloride and oxygen
Answer:
Lithium perchlorate
Explanation:
The compound formed from lithium chloride and oxygen is lithium oxide (Li₂O).
When lithium chloride (LiCl) reacts with oxygen (O₂), they combine to form lithium oxide (Li₂O). In this reaction, each lithium-ion (Li⁺) from lithium chloride combines with an oxygen atom (O) from oxygen gas to form a lithium oxide molecule.
The chemical formula Li₂O indicates that two lithium ions are combined with one oxygen atom in the compound. This is because lithium has a +1 charge, and since there are two lithium ions, their combined charge is +2. Oxygen, on the other hand, has a -2 charge, so one oxygen atom is sufficient to balance the charges and form a neutral compound.
Hence, the name of the compound formed is Li₂O
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(04.03 MC)
The table shows the nature of the reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants
lonic compound + lonic compound
Products
lonic compound + lonic compound
Which of the following is true about this type of chemical reaction?
It is a single replacement reaction, and all four compounds are different.
It is a double replacement reaction, and all four compounds are different.
It is a single replacement reaction, and each compound has the same set of ions.
It is a double replacement reaction, and each compound has the same set of ions.
Answer: The given type of chemical reaction is a double replacement reaction, and each compound has the same set of ions.
Explanation:
When two different compounds chemically react with each other and their ions get exchanged with each other then it leads to the formation of two new compounds. This type of reaction is called double displacement reaction.
For example, [tex]KBr + AgNO_{3} \rightarrow KNO_{3} + AgBr(\downarrow)[/tex]
Here, both KBr and [tex]AgNO_{3}[/tex] are ionic compounds that leads to the formation of two new ionic compounds which are [tex]KNO_{3}[/tex] and AgBr.
Thus, we can conclude that the given type of chemical reaction is a double replacement reaction, and each compound has the same set of ions.
Why do need need pure substances
Answer:
To extract its derivatives without impurities
Given the balanced equation representing a reaction:
HCl + H2O H3O+ + Cl-
The water molecule acts as a base because it
Answer:
It accepted a proton from HCl
Explanation:
When properly written, the equation box the reaction is given as; HCl(aq) + H2O(l) ----> H3O+(aq) + Cl-(aq).
According to Brownstead-Lowry definition of acids and bases, an acid donates protons while a base accepts protons.
Water molecule acts as a base in the reaction because it accepted a proton from HCl in the reaction above.
In a solution containing 21.2 g sodium carbonate in 1.50 L of solution, calculate
the concentration of the sodium and carbonate ions.
Answer:
0.13 molL-1
Explanation:
We must first obtain the number of moles of sodium carbonate as follows;
Number of moles = mass/molar mass
Number of moles = 21.2 g/106 g/mol
Number of moles= 0.2 moles
Number of moles = concentration × volume
Volume = 1.50 L
Concentration = number of moles/volume
Concentration = 0.2 moles/1.5 L
Concentration = 0.13 molL-1
What is the mass in grams of 3.45 moles of N?
mass of 1 mole of N is 14g
so mass of 3.45 mole is
3.45 × 14 = 48.3 g
Need help for this answer
Answer:
animals that live in the desert hibernate in winter
am not sure
Draw the structural formula (not the skeletal formula) for 2-octene.
Answer:
Explanation:
2-octene is a structural isomer of octene. Octene is an unsaturated hydrocarbon (alkene) with 8 carbon atoms. The structural formula of 2-octene is seen below
H H H H H H
I I I I I I
H- C - C = C - C - C - C - C - C - H
I I I I I I I I
H H H H H H H H
The structural formula of 2-octene is different from that of octene in the sense that, it's double bond is found in between the second and the third carbon (on the second bond position).
What is the molecular formula of the compound CH2 with molar mass = 42.0 g/mol? A. C2H18 B. C2H4 C. CAHg O D. C3H6
The molecular formula of the compound CH2 with molar mass = 42.0 g/mol is C₃H₆. Therefore, option D is correct.
What is molar mass ?The term molar mass is defined as the mass in grams of one mole of a substance. The units of molar mass are grams per mole, abbreviated as g/mol.
First, let's find the molar mass of CH₂.
The molar mass CH₂= 12.0 + (2 x 1.01)
= 14.02 g/mol
Now to determine the molecular formula, we need to find the ratio based in the molar masses.
42 / 14.02
= 2.99
≅ 3
Therefore, the ratio is 3, the molecular formula is C₃H₆.
Thus, option D is correct.
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Which of the forces of molecular attraction is the weakest? A London dispersion forces B hydrogen bond C single covalent bond D dipole dipole interactions
Answer: London dispersion forces of molecular attraction is the weakest.
Explanation:
The forces which exist between neighboring atoms, molecules or ions can be force of attraction or force of repulsion. These forces are called intermolecular forces.
When ions with same charge come in contact with each other then force of repulsion is there but when ions with opposite charge comes in contact with each other then force of attraction will be there.
These forces are described as follows.
London dispersion forces: The electrostatic attraction between atoms or molecules causes a temporary induced charge on the respective atoms. These attractive forces are weak in nature and called London dispersion forces.
Hydrogen bond: When a hydrogen atom is attached to electronegative atom like fluorine, nitrogen and oxygen then bonding between these atoms is called a hydrogen bond.
Dipole-dipole interaction: When positive end of one polar molecule gets attracted by the negative end of another polar molecule then force existing between these ends is called dipole-dipole interaction.
Single covalent bond: When an atom is sharing its valence electrons with another atom then it is called a covalent bond.
Thus, we can conclude that London dispersion forces of molecular attraction is the weakest.
The table shows the specific heat of four substances—brick, dry soil, paper, and water. If all four substances were exposed to sunlight for the same amount of time, which substance would heat up the fastest?
Answer:
Brick
Explanation:
.................
Where can we find what the chemical symbols in a compound mean? Example: 0, C, Na, Li
Answer:
The periodic table
Explanation:
I'm not really sure what your question is. . . I'm assuming this is what you're looking for
Explain how monumentum conservation is applied in ball games
Answer:
Hi , your answer is that At impact, the cue ball stops, but transfers all of its momentum and kinetic energy to the other ball, resulting in the hit ball rolling with the initial speed of the cue ball. In an inelastic collision, momentum is conserved, but the total kinetic energy of the system is not conserved
Explanation:
i really hope i helped , pleae give me brainliest , have a nice day and thank you in advance :) .
Using the periodic table, choose the more reactive nonmetal.
Br or As
Reactivity of non-metals depend on their ability to gain electrons. So, smaller is the size of a non-metal more readily it will attract electrons because then nucleus will be more closer to valence shell. ... Hence, Br is the non-metal which will be more reactive than At.
Answer:
br is more reactive than as
Question 2
5 pts
_AI(NO3)3 +
K2CO3 →
Al2(CO3)3 +
KNO3
What is the correct set of coefficients used to balance the equation above?
O 2, 3, 1,6
O 2, 6, 1, 3
O 2, 3, 1,9
O 3, 3, 1.2
Answer:
2Al(NO3)3+3K2CO3->Al2(CO3)3+6KNO3
So the right answer is 2,3,1,6
Explanation:
First you look at the equation that isn't balance, you can see Al(NO3)3 while Al2(CO3)3, so you put 2 in Al(NO3)3.
Now we have 2Al is correct, but 6NO3. So we have 6KNO3, it also means we have 6K
Finally, we only have 2K as K2CO3 so we put 3 in it, so we have 3K2CO3.
Sorry about my explanation, it's hard to understand but the answer is correct.
When naming a molecule, how do you indicate that the carbons on either side
of the double bond are pointing in opposite directions?
Answer:
use the prefix trans-
When naming a molecule, we indicate that the carbons on either side of the double bond are pointing in opposite directions by adding a prefix (-trans) in the name of the molecule.
What is IUPAC nomenclature?IUPAC nomenclature of organic compounds refers to the systematic approach taken for the nomenclature of organic compounds as per the recommendation of the International Union of Pure and Applied Chemistry.
If alkenes have two different substituents at each end of the C=C then they can exist as stereoisomers (as geometric isomers).
This is because there is restricted rotation of the double bond due to the pi bond which means they don't readily interconvert.
cis- if the two alkyl groups, R-, are on the same side of the C=Ctrans- if the two alkyl groups, R-, are on opposite sides of the C=C.Therefore, When naming a molecule, we indicate that the carbons on either side of the double bond are pointing in opposite directions by adding a prefix (-trans) in the name of the molecule.
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what's the meaning of pH in acids and base
Answer:
pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
Which of the following molecules or ions has a bent shape?
A: CIO4
B: PH3
C: OF2
D: PCI5
Calculate the volume of an
object with the following
dimension:
4.0 cm x 1.2 cm x 2.5 cm
[?] cm3
Answer: The volume of given object is 12.0 [tex]cm^{3}[/tex].
Explanation:
Given: Length = 4.0 cm
Width = 1.2 cm
Height = 2.5 cm
Formula to calculate the volume of such an object is as follows.
[tex]Volume = length \times width \times height[/tex]
Substitute the values into above formula as follows.
[tex]Volume = length \times width \times height\\= 4.0 cm \times 1.2 cm \times 2.5 cm\\= 12.0 cm^{3}[/tex]
Thus, we can conclude that the volume of given object is 12.0 [tex]cm^{3}[/tex].
Comparing the sizes of these atoms, which atom is smallest?
a.rubidium
b.zirconium
c.lead
d.silver
e.xenon
Answer:
xenon
Explanation:
Rb>Zr>Ag>Pb>Xe
Aluminum reacts with oxygen to form aluminum oxide. Select the correct unbalanced skeleton equation for this reaction. A. Al(s) + 0(g) - AIO(s) B. Al203(s) - Al(s) + 02(8) C. Al(s) - 02(8) + Al203(s) D. Al(s) + 02(8) - Al203(s)
Answer:
D. Al(s) + O₂(g) → Al₂O₃(s)
Explanation:
Aluminum is a solid metal, so it is written as Al(s).
Oxygen is a diatomic gas, so we write this compound as O₂(g).
Aluminum oxide has the formula Al₂O₃ because in oxides the oxidation number of oxygen atom is -2 and for aluminum, the oxidation number is 3. Thus, we write this compound as Al₂O₃(s).
Now, we have to found the chemical equation in which the reactants (left side) are Al(s) and O₂(g) while the product (right side) is Al₂O₃(s). From the options, we can see that the correct is (D):
Al(s) + O₂(g) → Al₂O₃(s)
What benefits and drawbacks do you see with maintaining and preserving nature through national parks?
the correct sequence where reactivity towards oxygen increases.
Answer:
Option D is good to go!
Explanation: as per the reactivity series more reactive substances will react with the counterpart substance.The most reactive substance here is calcium while the least reactive is aluminium, the magnesium comes in between.As per their reactivity, these substances will react with oxygen.
Explanation:
The skin has and needs natural oils. Why is it advisable
to wear gloves while working with strong alkalis ?
Answer:
As we know that alkalis react with oil to form soap. As our skin contains oil so when we touch strong alkalis, a reaction takes place and the soapy solution is formed. Hence we should wear gloves.
Answer:
As we know that alkalis react with oil to form soap. As our skin contains oil so when we touch strong alkalis, a reaction takes place and the soapy solution is formed. Hence we should wear gloves.
Explanation:
it from internet
Use the table to compare the solubility of substances. Check all of the boxes that apply.
Aspirin is less soluble than table salt, but more soluble than carbon dioxide.
A salt water solution can be made by dissolving 20 g NaCl in 50 mL water.
A saturated solution of table sugar is more concentrated than a saturated solution of table salt.
Increasing the temperature will increase the solubility of all the solutes in the table
**Check for proof photos at the bottom.**
_____________________________________Use the table to compare the solubilities of substances. Check all of the boxes that apply.
A. Aspirin is less soluble than table salt, but more soluble than carbon dioxide.
C. A saturated solution of table sugar is more concentrated than a saturated solution of table salt.
_____________________________________The solubility of glucose at 30°C is 125 g/100 g water. Classify a solution made by adding 550 g of glucose to 400 mL of water at 30°C. Explain your classification, and describe how you could increase the amount of glucose in the solution without adding more glucose.
Answer: The solution is saturated. At 30°C, 500 g of glucose will dissolve in 400 mL of solution. Of the 550 g glucose added, only 500 g will dissolve and 50 g will precipitate out. The amount of glucose in the solution can be increased by heating the solution because the solubility of solids tends to increase with temperature.
_____________________________________Use the graph to identify the number, letter, or word that completes each statement.
• The solubility of Solute D decreases as temperature increases.
• The solubility of Solute E increases the most as temperature increases.
• The solubility of Solutes C and D is the same at 20°C.
• As the temperature increases from 0 to 100, the solubility only changes by about 5 grams for Solute B.
_____________________________________Explanation:In the provided table shows the solubility of 4 different substances. The solubility number for Aspirin is smaller than the number for table salt, but larger than the number for carbon dioxide. Since the solubility if sugar is larger than table salt, its saturated concentration would be higher.
In the given chart, the line representing solubility of solute D decreases as temperature increases. The line for solute E increases the most. At 20°C, the lines of C and D are about the same height.
Here are photos of Edge just incase.
Answer:
A & C
Explanation:
How much work (in J) is involved in a chemical reaction if the volume decreases from 5.20 to 1.13 L against a constant pressure of 0.852 atm ? Express your answer to three significant figures and include the appropriate units.
Answer:
W = 350.6 J
Explanation:
Given that,
The volume decreases from 5.20 to 1.13 L against a constant pressure of 0.852 atm.
The change in volume = 1.13 L - 5.20 L = -4.07 L
Work done, W = - PΔV
So,
W = 0.852 atm × -4.07 L
= - 3.46 L-atm
or
[tex]W=3.46\ L-atm\times \dfrac{101.33\ J}{1\ L-atm}\\\\=350.6\ J[/tex]
So, the required work done is 350.6 J.