Answer:
This question is incomplete
Explanation:
This question is incomplete but the answer to the question can be correctly predicted from the available information from the question.
1. If a "container" (in this case a crucible) is closed throughout a heating experiment. Then it must be noted that water vapor will not be able to escape during the course of the experiment. The water vapor will form a "cloud" of water droplets under the cover of the crucible. And when this crucible is cooled, this water droplets return back to the content/substance inside the crucible.
2. When compared with the initial amount of water present in the substance in the crucible, the percentage of water "left" in the hydrate or substance in the crucible would be high. This is because the water vapor that was suppose to leave the crucible did not leave because the crucible was closed (thus causing very low amount of water vapour to leave).
Because of the student error, the percent water of crystallization value the hydrate will be lower than its actual value.
What is evaporation?Evaporation is the process by which a liquid changes spontaneously to vapor.
In the experiment to determine percentage water of crystallization, the crucible is left open to ensure all the water molecules are removed by evaporation.
However,, since the student did not remove the crucible cover during heating, some water molecules will not be able to escape completely, but will return back to the salt.
Hence, the percent water of crystallization value the hydrate will be lower because the of mass of the anhydrous salt will be higher than its actual value.
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PLEASE CHECK MY ANSWERS AND VERIFY THEM! THANK YOU SO MUCH !!!!!
1. Define matter.
2. Compare and contrast length, mass, and volume.
3. What are the three states of matter? Name at least three phase changes.
4. What are the base metric units for:
a. Length
b. Volume
c. Mass
d. Temperature
5. What is the equation used to find density?
6. List the different groups on the periodic table
7. Contrast metals and nonmetals.
8. Draw and label a picture of an atom which includes:
a. Neutrons
b. Protons
c. Electrons
9. Where are the protons and neutrons found in an atom?
10. What represents the number of protons?
Answer:
its 10
Explanation:
i took the test
Which of the following correctly identifies and explains the charge on an atom of
sodium?
Answer:
The best and most correct answer among the choices provided by your question is the fourth choice.
The data explains that sodium atoms hardly ever form 2+ ions.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
Explanation:
How much force is needed to cause a 15 kilogram bicycle to accelerate at a rate of 10 meters per second per second?
Answer:
F = 150 N
Explanation:
Given data:
Mass of bicycle = 15 kg
Acceleration = 10 m/s²
Force needed = ?
Solution:
Formula:
F = ma
F = force
m = mass
a = acceleration
now we will put the values in formula.
F = 15 Kg × 10 m/s²
F = 150 Kg.m/s²
Kg.m/s² = N
F = 150 N
There are two cups of water. The cups of water must have the same average Kinetic energy if they have the same ___
Answer:
Temperature and Heat
Explanation:
Proportional to the average kinetic energy of the molecules in a substance.
The smallest possible particle of an element is a(n) .
Answer: Atoms are the smallest particles of an element.
PLS HELP!!!
What does it mean when there is a physical change?
A new substance has been formed.
Matter has changed on the molecular level.
Matter has changed from one substance into another.
Matter has changed size, shape or form.
Answer:
Physical Change. Physical changes are changes in which no bonds are broken or formed. This means that the same types of compounds or elements that were there at the beginning of the change are there at the end of the change.
Nose color is an inherited trait in dogs. Two puppies from the same set of parents have different color noses. One puppy has a pink nose and one puppy has a black nose. How can puppies from the same set of parents have different color noses?
A.
The pink-nosed puppy and the black nosed puppy must not actually be related.
B.
The pink-nosed puppy and the black nosed puppy inherited different combinations of the genes for nose color from their parents.
C.
The pink-nosed puppy has a different number of chromosomes than the black nosed puppy.
D.
The pink nosed puppy and the black nosed puppy have different chromosomes for the two nose colors.
Answer:
I thin its B im not sure though
Explanation:
The puppies from the same set of parents have different color noses because the pink-nosed puppy and the black nosed puppy inherited different combinations of the genes for nose color from their parents. Thus, the correct option is B.
What is a gene?A gene is the unit of inheritance which is made up of DNA (deoxyribonucleic acid). Every person receives two copies or alleles of each gene which is inherited from each of the two parent.
Genes are made up of DNA, so each of the chromosome contains many different genes. Genes carry the information which determines the traits or characteristics that are passed on to their offspring or inherited from the parents.
The puppies from the same set of parents have different colored noses because pink-nosed puppy and the black nosed puppy inherited different combinations of the genes for nose color from their parents.
Therefore, the correct option is B.
Learn more about Inheritance here:
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How many molecules of SO₃ can be formed from 0.35 moles of O₂ (assuming excess SO₂) from the following UNBALANCED equation?
SO₂(g) + O₂(g) → SO₃(g)
Molecules of SO₃ : 4.214 x 10²³
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction(balanced)
2SO₂(g) + O₂(g) → 2SO₃(g)
mol SO₃ :
[tex]\tt mol~SO_3=\dfrac{2}{1}\times mol~O_2[/tex]
[tex]\tt 2\times 0.35=0.7[/tex]
number of molecules :
1 mol = 6.02 x 10²³ particles(atoms, molecules,ions)
[tex]\tt 0.7\times 6.02\times 10^{23}=4.214\times 10^{23}[/tex]
The number of molecules of SO₃ that could be formed is 4.2 × 10²³ molecules
From the question,
We are to determine the number of molecules of SO₃ that could be formed.
The given chemical equation for the reaction is
SO₂(g) + O₂(g) → SO₃(g)
First, we will balance the chemical equation
The balanced chemical equation for the reaction is
2SO₂(g) + O₂(g) → 2SO₃(g)
This means
2 moles of SO₂ reacts with 1 mole of O₂ to produce 2 moles of SO₃
From the given information
Number of moles of O₂ present = 0.35 moles
Since,
2 moles of SO₂ reacts with 1 mole of O₂ to produce 2 moles of SO₃
Then,
2×0.35 mole of SO₂ will react with the 0.35 mole of O₂ to produce 2×0.35 mole of SO₃
That is,
0.70 mole of SO₂ will react with the 0.35 mole of O₂ to produce 0.70 mole of SO₃
∴ 0.70 mole of SO₃ could be produced
Now, for the number of molecules of SO₃ that could be produced,
Using the formula
Number of molecules = Number of moles × Avogadro's constant
∴ Number of molecules of SO₃ that could be formed = 0.70 × 6.022 × 10²³
Number of molecules of SO₃ that could be formed = 4.2154 × 10²³
Number of molecules of SO₃ that could be formed ≅ 4.2 × 10²³ molecules
Hence, the number of molecules of SO₃ that could be formed is 4.2 × 10²³ molecules
Learn more here: https://brainly.com/question/12823498
Does the radiation from the sun travel to earth in varying frequencies
Explanation:
The gamma ray photons make their arduous journey to the surface of the Sun, they are continuously absorbed by the solar plasma and re-emitted to lower frequencies. ... By the time they get to the surface, their frequencies are mostly only within the IR/visible light/UV spectrum. Nov28,2020
what mass of potassium chlorate should be required to produce 113 L of oxygen O2. measured at STP g
Answer:
411.6 g
Explanation:
The equation for the decomposition of potassium chlorate to produce oxygen is given as;
2KClO3 --> 2KCl + 3O2
From the stochiometry of the reaction 2 mole of KClO3 produces 3 mol of O2
At STP,
1 mol = 22.4L
3 mol = x
x = 67.2L
2 mole of KClO3 produces 67.2L of O2
How many moles would produce 113L?
2 = 67.2
x = 113
x = 3.36 moles
Moles can be converted to mass using;
Mass = moles * Molar mass
Mass = 3,36 * 122.5 g/mol
Mass = 411.6 g
In order for radiation to transfer heat, A electromagnetic waves must be transmitted
B objects must be in direct physical contact C particles must circulate and move in a liquid or gas D thermal energy must move from cold to hot objects.
Answer : A
Explanation
B- conduction
c - convection
D heat transfer
Answer:
d
Explanation:
Weathering refers to the effects of exposure to A) insults B)pressure C)weather
For the chemical reaction 2HBr(aq)+Ba(OH)2(aq)⟶2H2O(l)+BaBr2(aq) write the net ionic equation, including the phases.
Answer:
2H⁺(aq) + 2OH⁻(aq) --> 2H2O(l)
Explanation:
2HBr(aq)+Ba(OH)2(aq)⟶2H2O(l)+BaBr2(aq)
We break the compounds into ions. Only compounds in the aqueous form can be turned into ions.
The ionic equation is given as;
2H⁺(aq) + 2Br⁻(aq) + Ba²⁺(aq) + 2OH⁻(aq) --> 2H2O(l) + Ba²⁺(aq) + 2Br⁻(aq)
Upon eliminating the spectator ions; The net equation is given as;
2H⁺(aq) + 2OH⁻(aq) --> 2H2O(l)
What is the formula for Mercury ii monohydrogen phosphate?
Answer:
CaHPO4 i think
Explanation:
an 11.5g sample of ethonal 6.00g of Carbon 1.51g of hydrogen what is the percent composition of each element
C : 52.2%, H : 13.1%, O:34.7%
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
11.5 g of Ethanol-C₂H₅OH contains 6.00 g of Carbon and 1.51 g of Hydrogen.
mass of Oxygen :
[tex]\tt 11.5-(6+1.51)=4~g[/tex]
Percent composition :
C[tex]\tt \dfrac{6}{11.5}\times 100\%=52.2\%[/tex]
H[tex]\tt \dfrac{1.51}{11.5}\times 100\%=13.1\%[/tex]
O[tex]\tt \dfrac{4}{11.5}\times 100\5=34.7\%[/tex]
calculate the heat required in joules to convert 18.0 grams of water ice at a temperature of -20 c to liquid water at the normal boiling point of water given specific heat of ice 2.09
Answer:
Explanation:
Heat required to convert ice to ice at 0⁰C
= mass x specific heat x rise in temperature
= 18 x 2.09 x 20
= 752.4 J .
heat required to convert ice at 0⁰C to water at 0⁰C
mass x latent heat of fusion
= 18 x 336
= 6048 J
Heat required to increase the temperature of water to 100⁰C
= 18 x 4.2 x 100
= 7560 J
Total heat required
7560 + 6048 + 752.4
= 14360.4 J
The formation of ammonia is represented by the equation N2(g) + 3H2(g) ⇌ 2NH3(g). Determine the enthalpy of formation of ammonia given the following mean bond enthalpies (kJmol-1): N≡N 942; H-H 436; N-H 386
Answer:
[tex]\Delta _fH_{NH_3}=-66\frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, since the study of the bond energy allows us to compute the enthalpies of some reactions, for this combination reaction by which ammonia is yielded, we understand the enthalpy of reaction equals the enthalpy of formation of ammonia, and, in terms of the bonds energy we can write:
[tex]\Delta _fH_{NH_3}=Delta _rH=\Sigma \Delta H(bonds \ broken)-\Sigma \Delta H(bonds \ formed)[/tex]
Whereas the bonds enthalpy of those bonds that get broken cover the N≡N and the three H-H bonds at the reactants side and the enthalpy of those bonds that are formed cover the six N-H bonds at the products; which means we obtain:
[tex]\Delta _fH_{NH_3}=942\frac{kJ}{mol} +3*436\frac{kJ}{mol}-6*386\frac{kJ}{mol}\\\\\Delta _fH_{NH_3}=-66\frac{kJ}{mol}[/tex]
Which differs from the theoretical value that is -46 kJ/mol.
Best regards!
2. Determine the heat of reaction (AH,xn) for the process by which hydrazine (N2H4)
is formed from its elements:
N2 (g) +
2 H2 (g) →
N2H4 (g)
by using the following thermochemical data:
N H. (g)
+
O2 (g) →
N2 (g)
-
2 H2O(g)
AH - - 622.2 kJ
H2(g) +
1/2 O2 (g)
H2O (g)
AH = - 285.8 kJ
IN
The heat of reaction : 50.6 kJ
Further explanationBased on the principle of Hess's Law, the change in enthalpy of a reaction will be the same even though it is through several stages or ways
Reaction
N₂(g) + 2H₂(g) ⇒N₂H₄(l)
thermochemical data:
1. N₂H₄(l)+O₂(g)⇒N₂(g)+2H₂O(l) ΔH=-622.2 kJ
2. H₂(g)+1/2O₂(g)⇒H₂O(l) ΔH=-285.8 kJ
We arrange the position of the elements / compounds so that they correspond to the main reaction, and the enthalpy sign will also change
1. N₂(g)+H₂O(l) ⇒ N₂H₄(l)+O₂(g) ΔH=+622.2 kJ
2. H₂(g)+1/2O₂(g)⇒H₂O(l) ΔH=-285.8 kJ x 2 ⇒
2H₂(g)+O₂(g)⇒2H₂O(l) ΔH=-571.6 kJ
Add reaction 1 and reaction 2, and remove the same compound from different sides
1. N₂(g)+2H₂O(l) ⇒ N₂H₄(l)+O₂(g) ΔH=+622.2 kJ
2.2H₂(g)+O₂(g)⇒2H₂O(l) ΔH=-571.6 kJ
-------------------------------------------------------------------- +
N₂(g) + 2H₂(g) ⇒N₂H₄(l) ΔH=50.6 kJ
Hydrogen gas “fire quickly in the Hindenburg accident. In comparison, neon gas and helium gas are non-reactive. This is why helium is safe for F aircraft, and neon is safe for electrical signs. Which statement best explains why helium and neon have similar chemical properties?
They both are nonmetals. They both have few protons. They each have only one valance electron. They have the same number of valence electrons.
Answer:
They have the same number of valence electrons.
Explanation:
As a rule of thumb, elements with the same chemical properties must have the same number of valence electrons. This is why elements in the same group have similar chemical properties.
Chemical properties are predicated on the number of valence electrons in an atom. Atoms reacts with other atoms using the number of valence electrons they contain. Helium and neon are in the same group with 8 valence electrons. The valence electrons are the outermost electrons in an atom.a sample of a gas has a volume kf 640 cm^{3} at 100°c and 1490 mmhg,what would be its volume at stp?
Answer:
V₂ = 918.1 cm³
Explanation:
Given data:
Initial volume = 640 cm³
Initial temperature = 100°C (100+273 = 373 K)
Initial pressure = 1490 mmHg (1490 /760 = 1.96 atm)
Final volume = ?
Final temperature = 273 K
Final pressure = 1 atm
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
now we will put the values in formula.
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1.96 atm × 640 cm³ × 273 K / 373 K × 1 atm
V₂ = 342451.2 atm .cm³ . K / 373 K. atm
V₂ = 918.1 cm³
Define oxidation and reduction.Balance the following redox reaction by ` oxidation number method or ion electrons method.` I_(2)+OH^(-)rarr I^(-)+10_(3)^(-)+H_(2)O
Answer:
HNO₃ + H₃AsO₃(aq) → NO(g) + H₃AsO₄(aq) + H₂O(l)
Identify the oxidation number of every atom.
Left hand side: H= +1; N= +5; O = -2; As = +3
Right hand side: N = +2; O = -2; H = +1; As = +5
Determine the change in oxidation number for each atom that changes.
N: +5 → +2; Change = -3
As: +3 → +5; Change = +2
Make the total increase in oxidation number equal to the total decrease in oxidation number.
We need 2 atoms of N for every 3 atoms of As. This gives us total changes of -6 and +6.
Place these numbers as coefficients in front of the formulas containing those atoms.
2HNO₃ + 3H₃AsO₃(aq) → 2NO(g) + 3H₃AsO₄(aq) + H₂O(l)
Balance all remaining atoms other than H and O.
Done.
Balance O.
Done.
Balance H.
Done.
Explanation:
How many moles is 4.98x1028 molecules of NaBr?
Answer:
The answer is 82,724.25 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.98 \times {10}^{28} }{6.02 \times {10}^{23} } \\ = 82724.2524...[/tex]
We have the final answer as
82,724.25 molesHope this helps you
(Question) : What is the specific gravity of liquid sample with a mass
of 35.0 g and a volume of. 14.00 mL ?
Answer:
48.0g is the specific gravity of liquid sample with a mass of 35.0g and a volume of 14.00 mL
How did you organize the tiles in part A? Describe the method that you used.
Periodic table of numbers tiles
Answer:
I ordered the tiles from left to right and top to bottom as the numbers kept increasing. The tiles were also organized based on the color and shape that they were. The tiles with the same color and shape were arranged in the same column.
Explanation:
In the modern periodic table, the elements are listed in order of increasing atomic number and elements having similar chemical properties naturally line up in the same column (group).
Ground glass is a/an _______ material.
a) soft
b) opaque
c) translucent
d) transparent
Answer:
Opaque Material
Answer:
A ground glass is translucent as it allows only partial light to pass through it and forms light shadows
How many grams are in 3.20 mol of sodium chloride (NaCl)?
Answer:
5.52 nac
Explanation:
Spell out the full name of this compound:
There is a diagram of a seven-membered carbon chain, with a –CH3 group attached to the second and fourth carbons.
Answer:
nomenclature of alkanes
Explination:
Substituent Formula Number of C Atoms Name of Substituent
CH3 1 methyl–
CH3CH2 2 ethyl–
CH3CH2CH2 3 propyl–
CH3CH2CH2CH2 4 butyl–
CH3CH2CH2CH2CH2 5 pentyl–
and so forth and so forth and so forth
Try this it helped me allot,
Alkenes and alkynes are named in a similar fashion. The biggest difference is that when identifying the longest carbon chain, it must contain the C–C double or triple bond. Furthermore, when numbering the main chain, the double or triple bond gets the lowest possible number. This means that there may be longer or higher-numbered substituents than would be allowed if the molecule were an alkane. For example, this molecule is 2,4-dimethylhept-3-ene (note the number and the hyphens that indicate the position of the double bond).
2,4-dimethylhept-3-ene
or two one carbonsubstituents on the second and third C atoms
its not 3-methylheptane.
Determine the volume (mL) of 15.0 M sulfuric acid needed to react with 45.0 g of
aluminum to produce aluminum sulfate.
Answer:
167 mL.
Explanation:
We'll begin by calculating the number of moles in 45 g of aluminum (Al). This can be obtained as follow:
Mass of Al = 45 g
Molar mass of Al = 27 g/mol
Mole of Al =?
Mole = mass /Molar mass
Mole of Al = 45/27
Mole of Al = 1.67 moles
Next, the balanced equation for the reaction. This is given below:
2Al + 3H2SO4 → Al2(SO4)3 + 3H2
From the balanced equation above,
2 moles of Al reacted with 3 moles of H2SO4.
Next, we shall determine the number of mole of H2SO4 needed to react with 45 g (i.e 1.67 moles) of Al. This can be obtained as:
From the balanced equation above,
2 moles of Al reacted with 3 moles of H2SO4.
Therefore, 1.67 moles of Al will react with = (1.67 × 3)/2 = 2.505 moles of H2SO4.
Thus 2.505 moles of H2SO4 is needed for the reaction.
Next, we shall determine the volume of H2SO4 needed for the reaction. This can be obtained as follow:
Molarity of H2SO4 = 15.0 M
Mole of H2SO4 = 2.505 moles
Volume =?
Molarity = mole /Volume
15 = 2.505 / volume
Cross multiply
15 × volume = 2.505
Divide both side by 15
Volume = 2.505/15
Volume = 0.167 L
Finally, we shall convert 0.167 L to mL. This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.167 L = 0.167 L × 1000 mL / 1 L
0.167 L = 167 mL
Thus, 0.167 L is equivalent to 167 mL.
Therefore, 167 mL H2SO4 is needed for the reaction.
if the reactant solution is used to write on a piece of paper and the paper is allowed to partially dry, what can be done to bring out the colored writing
Answer:
Expose the paper to the atmosphere or moisture
Explanation:
An interesting experiment that demonstrates the equilibrium of complexes is that of the invisible ink.
The invisible ink is pink colored [Co(H2O)6]Cl2 which is essentially colorless and pale when it is used to write on paper. This complex is almost colorless when dilute. Therefore, when it is used in writing, the writing can not be seen.
However, if the paper is left to stand or allowed to absorb moisture; the following equilibrium is set up:
[Co(H2O)6]Cl2 ⇄ [CoCl2(H2O)2] + 4H2O
The formation of blue [CoCl2(H2O)2] on standing or exposure to moisture enables the colored writing to be easily read.
