Answer:
Baking a cake requires heat to be applied to the batter in order for it to cook and chemically change into cake. The energy or heat applied is absorbed by the ingredients, so this represents an endothermic reaction.
Explanation:
Answer:
Sample Response: Baking a cake requires heat to be applied to the batter in order for it to cook and chemically change into cake. The energy or heat applied is absorbed by the ingredients, so this represents an endothermic reaction.
Explanation:
on edge
Write the net ionic equation. An aqueous solution of sodium carbonate is added to an aqueous solution of calcium chloride. Calcium carbonate is precipitated
Answer:
Ca + CO₃²⁻ → CaCO₃
Explanation:
Solution:
Sodium carbonate = Na₂CO₃
Calcium chloride = CaCl₂
Calcium carbonate is precipitated
Reaction equation:
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
The net ionic equation:
2Na⁺ + CO₃²⁻ + Ca + 2Cl⁻ → CaCO₃ + 2Na⁺ + Cl⁻
the spectator ions which both appears on both sides will cancel out and leave behind the net ionic equation:
Ca + CO₃²⁻ → CaCO₃
Calculate the percent yield of (4-chlorophenyl)bis(4-methoxyphenyl)methanol if the actual isolated mass is 0.15 g.
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, in order to calculate the percentage yield of an extraction/isolation, the formula to be used is below
percent yield = isolated mass/total mass × 100
The mass of the yield (which can also be referred to as isolated mass) was provided to be 0.15 g but the total mass of the (4-chlorophenyl)bis(4-methoxyphenyl)methanol was not provided.
In the completed question that has the total mass or the values to obtain the total mass, the formula mentioned earlier should be used.
Assuming that Coca-Cola has the same specific heat as water [4.18 J/(g°C)]. Calculate the amount of heat in kilojoules transferred when one can (about 350 gg) is cooled from 21°C to 8°C.
Answer:
Heat transferred in the process is 19019J
Explanation:
Using the equation:
Q = S×m×ΔT
We can solve the energy transferred in the process, Q, where:
S is specific heat = 4.18J /(g°C)
m is mass = 350g
ΔT is change in temperature (21°C - 8°C = 13°C)
Q = 4.18J/(g°C)×350g×13°C
Q = 19019J
Heat transferred in the process is 19019JQuestion 4 of 5
Zinc (Zn) combines with hydrogen chloride (HCI) to form
hydrogen gas (H2) and zinc chloride (ZnCl2).
Which equation represents this chemical reaction?
A. ZnCl2 + Zn - H2 + 2HCI
B. Zn - H2 + ZnCl2 + 2HCI
C. Zn + 2HCI - H2 + ZnCl2
D. 2HCl - H2 + Zn + ZnCl2
Answer:
Required Answer:-First rewrite the sentence that defines the equationZinc (Zn) combines with hydrogen chloride (HCI) to form hydrogen gas(H2) and zinc chloride (ZnCl2).
Chemical Equation[tex]\sf Zinc+Hydrogen\:Chloride \longrightarrow Hydrogen\:gas+Zinc\:Chloride[/tex]
Now write the equation[tex]\sf Zn+HCL \longrightarrow H_2+ZnCl_2 [/tex]
Balance[tex]\sf Zn+2HCL\longrightarrow H_2+ZnCl_2 [/tex]
option C is correctAnswer:
Explanation:
Answer is C
PLEASE HELP ASAP
An element has 24 protons and 20 electrons. What is the chemical symbol?
Answer:
Br
Explanation:
You are the medical examiner at the scene of a murder at a restaurant. There is a
suspicion that the victim was poisoned. Their blood contained the following %
composition 80.66%-c, 7.39%-H, 9.39 %-N, and 2.68%-o Which of the following
compounds was the cause of the murder?
The compound : C₄₀H₄₄N₄O
Further explanationThe empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
• Determine the mass ratio of the constituent elements of the compound.
• Determine the mole ratio by dividing the percentage by the atomic mass
The mol ratio of composition : C : H : N : O
[tex]\tt \dfrac{80.66}{12}\div \dfrac{7.39}{1}\div \dfrac{9.39}{14}\div \dfrac{2.68}{16}\\\\6.722\div 7.39\div 0.671\div 0.1675\rightarrow divide~by~smallest(0.1675)\\\\40\div 44\div 4\div 1[/tex]
At high temperatures, sulfur combines with iron to form brown-black iron(II) sulfide:
Fe(s) + SD-Fes(s)
In an experiment, 5.00 g of iron reacts with excess sulfur to produce 6.29 g of iron(II) sulfide. Calculate the percent yield if the maximum
amount of iron(II) sulfide that can be produced is 7.87 g.
79.796
79.9%
100%
63.5%
125%
The percent yield : 79.9%
Further eplanationPercent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
Fe(s)+S(s)⇒FeS(s)
The reaction produces 6.29 g of iron(II) sulfide⇒an actual yield
The maximum amount that can be produced is 7.87 g ⇒ A theoretical yield
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{6.29}{7.87}\times 100\5=79.9\%[/tex]
Please help. What masses of KCl and H2O are needed to make 250 g of 5.00 % solution?
____ g of KCl
____ g of H2O
Answer:
Therefore, in a 250 g of solution, 5% needs to be KCl, i.e. 5% x 250 = 12.5 g of KCl is needed.
Explanation:
Why do atoms form ionic and covalent bonds?
Explanation: an ionic bond, is when a atom basically gives a electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable by gaining the electrons covalent bonds form when sharing atoms results in the highest stability possible
Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Answer:
Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Explanation:
How does rusting differ from a combustion reaction?
O A. Rusting involves combining with oxygen, and combustion does not.
O B. Although both involve combining with oxygen, combustion is more rapid. O C. Combustion involves combining with oxygen, and rusting does not. O D. Rusting is a redox reaction, and combustion is not.
Answer:
B. Although both involve combining with oxygen, combustion is more rapid.
Explanation:
Both rusting and combustion involves are combination in which a substance reacts with oxygen.
The difference between both processes is that burning is a rapid process. Oxygen combines with a fuel in a very fast rate. Rusting is a slow process and it takes time. Water vapor is often needed for this reaction to take place. The rate at which combustion occurs is more rapid compared to slow, rusting process.Answer:
B. Although both involve combining with oxygen, combustion is more rapid
Explanation:
a p e x
If 4.74 g of propane is allowed to completely combust, calculate the mass of carbon dioxide formed at the end. Remember the units
Answer:
14.2g
Explanation:
The reaction expression is given as:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Given mass of propane combusted;
4.74g
Unknown:
Mass of carbon dioxide produced = ?
Solution:
To solve this problem, we find the number of moles of the given propane;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of C₃H₈ = 3(12) + 8(1) = 44g/mol
Number of moles = [tex]\frac{4.74}{44}[/tex] = 0.11mol
From the balanced reaction equation:
1 mole of C₃H₈ will produce 3 moles of CO₂
0.11mole of C₃H₈ will produce 3 x 0.11 = 0.33mole of CO₂
Mass of CO₂ = number of moles x molar mass
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Mass of CO₂ = 0.33 x 44 = 14.2g
Land is a natural resource because it is used by living things to meet their needs. O True
O False
Answer:
Absolutely True :) cause we use it all the time
Land is a natural resource because it is used by living things to meet their needs. The given statement is true.
What is natural resource?Natural resources are important commodities and are used on a global scale. This includes the extraction and purification procedures that allow for their usage in economic production or consumption. Land is a natural resource.
Natural resources can be either renewable (meaning there will eventually be more supply available after they are refilled) or non-renewable (meaning there won't be any more available supply to be harvested from once they run out). Land is a natural resource because it is used by living things to meet their needs. The given statement is true.
Therefore, the given statement is true.
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what is the reaction of guanine and adenine
Complementary Base Pairing. Specific pairs can only go together, so when guanine and adenine pair up, its Complementry Base Pairing :)
Hope this helps! Please correct me if im wrong :)
The doctor ordered 300 mg of clopidogrel P.O. STAT.the drug on hand is clopidogrel 75 mg/ TAB. How many tablets are you going to give to your patients?
Answer:
You would give four tablets of clopidogrel 75 mg/TAB STAT.
Consider the following reaction at equilibrium :
NO_2 (g)+CO (g)↔NO(g)+CO_2 (g) . suppose the volume of the system is decreased at a constant temperature, what change will this cause in the system?
Answer: No shift will occur
I need the full reason
If the volume of the system is decreased, no shift will occur
Further explanationIn the equilibrium system, according to Le Chatelier, if there is a reaction there will be action
Reaction = - action
The reaction taken by the system is to shift the reaction to the right or left.
The composition of chemical reactions in equilibrium can be influenced by temperature, pressure, and concentration.
While on the change in pressure(volume), then the addition of pressure, the reaction will shift towards a smaller reaction coefficient ((the fewest moles of gas )
This pressure usually affects the gas equilibrium system(only count the number of moles of gases)
Reaction
NO₂ (g)+CO (g)↔NO(g)+CO₂(g)
The reactant side of the equation has 2 moles of a gas(1 mole NO₂ and 1 mole CO) ; the product side has 2 moles (1 mole NO and 1 mole CO₂)
So the total number of moles from both sides is the same(2 moles) so that the change in volume (pressure) does not change the direction of equilibrium⇒No shift will occur
need help please ,thx
Answer:
can you get a picture that is in higher quality? we can't read what it's saying
Which reaction is represented by the net ionic equation for the combination of aqueous solutions of LiNO3 and NaC2H3O2?
Answer:
This question is incomplete
Explanation:
This question is incomplete but the completed question is in the attachment below. To determine the net ionic equation, one must first write the complete equation which is shown below
LiNO₃ + NaC₂H₃O₂ ⇒ LiC₂H₃O₂ + NaNO₃
The ionic equation represented from the above equation will be
Li¹⁺ NO₃⁻ + Na¹⁺ C₂H₃O₂¹⁻ ⇒ Li¹⁺ C₂H₃O₂¹⁻ + Na¹⁺NO₃¹⁻
Because the resultant NaNO₃ formed is an ionic compound (which does not form a molecule), the correct option from the options provided is the first option
Which statement best explains the relationship between cellular respiration and photosynthesis? Cellular respiration breaks down glucose, while photosynthesis builds glucose. Photosynthesis breaks down glucose, while cellular respiration builds glucose. Both photosynthesis and cellular respiration break down glucose. Both photosynthesis and cellular respiration build glucose.
Answer:
I think both photosynthesis and cellular respiration breaks down glucose
Explanation:
sorry if i'm wrong
Answer:
c
Explanation:
both photosynthesis and cellular respiration brakes down glucoso
Which of the following describes the location and energy of all the valence electrons
of electrically-neutral sulfur (S)?
3p4
3s23p4
Зрб
3523pó
Answer:
1s22s22p63s23p4
Explanation:
Sulfur is located in the p block and has 6 valence electrons (the 2 exponent on the 3s and the 4 exponent on the 3p add up to 6)
The location and energy of all the valence electrons of electrically-neutral sulfur ( S ) is 3s₂3p₄.
What is sulfur ?
Chemical element sulfur has the letter S and atomic number 16. It is multivalent, nonmetallic, and plentiful. Sulfur atoms normally combine to create cyclic octatomic molecules, which have the chemical formula S8. At room temperature, elemental sulfur is a crystalline solid that is brilliant yellow.
In addition to being a fungicide and an ingredient in black gunpowder, sulfur is used to vulcanize black rubber. However, the majority of sulfur is utilized in the creation of sulfuric acid, which is arguably the most significant chemical produced by western civilisations.
Sulfur can be found naturally and in metal sulfide ores. Natively, it may be found close to hot springs and volcanoes.
Thus, option B is correct.
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got banned for a while sorry everyone ill answer your questions :(
Answer:
I have been banned before too, it is not fun :(
Explanation:
this is actually my fourth account cause I also had some deleted
List the three subatomic particles. Give the relative masses and charges of each (sorry for putting it in college TvT)
Answer:
Explanation:
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
relative charge = -1
Relative mass = 1.1836
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
He constructed the glass tube and create vacuum in it. He applied electric current between electrodes. He noticed that a ray of particles coming from cathode to wards positively charged anode. This ray was cathode ray.
Properties of cathode ray:
The ray is travel in straight line.
The cathode ray is independent of composition of cathode.
When electric field is applied cathode ray is deflected towards the positively charged plate.
Hence it was consist of negatively charged particles.
While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Relative mass of proton= 1
Relative mass of neutron = 1
Relative mass of proton = +1
Relative charge of neutron = 0
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral.
Use the chemical equation below to determine how many moles of ammonia
(NH) will be produced from 4 moles of nitrogen gas (N). Assume that there is enough H, for all of the N, to be converted to NHs.
N2 + 3H2 → 2NH
A- 3 moles
B- 8 moles
C- 4 moles
D- 2 moles
Answer:
If we assume that there will be enough Hydrogen for the reaction to occur, then there will be 8 moles of NH
Explanation:
The balanced equation will look like this:
4N2 + 4H2 -> 8NH
Which one of the following orbitals in an atom has the lowest energy: a. 6p b. 4f C. 5d d. 7s
Which pair of elements have the same valence electronic configuration of np³?
(a)O and Se (b)Ge and Pb (c)P and Sb (d)K and Mg (e)Al and Ga
Answer:
(c) P and Sb
Explanation:
We can determine the number of valence electrons of an element:
If it belongs to Groups 1 and 2, the number of valence electrons is equal to the number of group and the differential electron occupies the s subshell.If it belongs to the groups 13-18, the number of valence electrons is equal to: "Number of group - 10" and the differential electron occupies the p subshell.Which pair of elements have the same valence electronic configuration of np³?
(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.
(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².
(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.
(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².
(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.
The pairs of elements that contain the similar valence electronic should be option (c) P and Sb
Valence electronic configuration:In the case when it belongs to Groups 1 and 2, the no of valence electrons should be equivalent to the number of groups and the differential electron occupies the s subshell. On the other hand, in the case when it belongs to the groups 13-18, the number of valence electrons should be equivalent to "Number of group - 10" and the differential electron occupies the p subshell.
This question is incomplete. Please find the completed question below.
Which pair of elements have the same valence electronic configuration of np³?
(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.
(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².
(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.
(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².
(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.
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How does the asthenosphere interact with the tectonic plates at a divergent boundary?
Answer:
Its D
Explanation:
A sample of air at 58.6 kPa is expanded from 250 mL to 655 mL. If thetemperature remains constant, what is the final pressure in kPa?
Answer:
22.366 kPaExplanation:
The final pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the final pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question
58.6 kPa = 58600 Pa
We have
[tex]P_2 = \frac{58600 \times 250}{655} = \frac{14650000}{655} \\ = 22366.4122... \\ = 22366[/tex]
We have the final answer as
22.366 kPaHope this helps you
Energy travels in what direction?
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4?
Answer:
18.33 ×10²³ atoms
Explanation:
Given data:
Molar mass of sulfuric acid = 98.1 g/mol
Mass of sulfuric acid = 75.0 g
Number of of oxygen atom present = ?
Solution:
Number of moles of sulfuric acid:
Number of moles = mass/molar mass
Number of moles = 75.0 g/ 98.1 g/mol
Number of moles =0.761 mol
one mole of sulfuric acid contain four mole of oxygen atom.
0.761 mol × 4 = 3.044 mol
1 mole = 6.022×10²³ atoms of oxygen
3.044 mol × 6.022×10²³ atoms of oxygen / 1mol
18.33 ×10²³ atoms
Waves of sound energy move ________ ___ ____ ___________ from the source.
Answer:
are there any options for us to choose from? or is it just fill in the blank
Waves of sound energy move in the form of vibration from the source of sound energy.
What is waves?Waves is a kind of disturbance that can travel through a medium from one point to another point.
Sound waves is also a type of wave in which energy is travelled from one point to another point through the vibration from the source of sound.
Hence energy travel in the form of vibration.
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