Answer:
A) sulfur - 32
Explanation:
In periodic table you can see that S has average atomic mass = 32.06
It is closest to 32, that means that most of the atoms are isotopes sulfur-32.
The most common isotope of sulfur is sulfur-32 (32S), as it has the highest natural abundance among sulfur isotopes at 95.02% and aligns with the atomic mass listed on the periodic table.
Using a periodic table, the most common isotope of sulfur can be determined to be sulfur-32 (32S). This is because the weighted average of sulfur's atomic mass on the periodic table closely aligns with the mass number of sulfur-32, indicating its high natural abundance. To confirm, the major isotopes of sulfur are 32S with a 95.02% abundance, 33S with a 0.75% abundance, 34S with a 4.21% abundance, and 36S with a 0.02% abundance. Therefore, the most common isotope of sulfur is sulfur-32 (32S), which coincides with option A in the question provided.
What other objects are often arranged by their properties
Answer:
Metaloids and metals.
Choose all the answers that apply.
Electrons _____.
have a positive charge
are found in the nucleus
orbit around the nucleus
have a negative charge
Electrons have a negative charge and orbit around the nucleus, while protons have a positive charge and are found in the nucleus. Neutrons have no charge and are also found in the nucleus with protons.
I hope this helps! If you have any doubts, feel free to ask.
your answer is C and D
A student was given four unknown solutions each was checked for conductivity and tested with phenolphthalein the results below
Based on data in table which unknown solution could be 0.1M NaOH
The solution which could be with 0.1 M NaOH is solution "C"
Explanation:
I have attached the snapshot of the table for the reference.Based on the data from the table, the solution which could be in the 0.1 M of NaOH will be the solution "c" the conductivity is good and the colour with the Phenolphthalein..Since the NaOH pH value is always greater than seven.And the chemical solution NaOH is based in nature when it is dissolved in nature separates into Na+ and OH- ions. NaOH is always a strong base because it completely divides in water to yield hydroxide ions.
What type of plate motion (together, apart, or sliding) has occurred at the Himalayas?
Which of the following is the best definition of radioactive decay?
O
A. Radioactive decay is the loss of mass that occurs when an atom
is formed.
) B. Radioactive decay is the splitting of a nucleus
amounts of energy.
O
C. Radioactive decay is the release of energy resulting from a
chemical reaction.
O
D. Radioactive decay is the spontaneous breakdown of a nucleus into
smaller parts.
Answer:
Radioactive decay is the spontaneous breakdown of a nucleus into smaller parts
Explanation:
For the balanced equation shown below, if the reaction of 0.112 grams of
H2 produces 0.745 grams of H20, what is the percent yield? Fe3O4 + 4H2 -> 3Fe
+ 4H2O
74.5%
84.5%
94.5%
092.2%
Answer:
The answer is 74.5%.
Explanation:
As we know that % yield= [tex]\frac{actual yield}{theoretical yield}[/tex] x 100%.
Therefore,
Step 1 Calculate Theoretical yield:
0.112[tex]H_{2}[/tex] x [tex]\frac{1 mol H_{2} }{2.016 g of H{2} }[/tex] x [tex]\frac{4 mol H_{2}O }{4 mol H_{2} }[/tex] x [tex]\frac{18.02 g H_{2}O }{1 mol H_{2}O}[/tex] = 1.001 g [tex]H_{2}O[/tex]
Now Step 2
% yield = [tex]\frac{actual yield}{theoretical yield}[/tex] x 100% = [tex]\frac{0.745g}{1.001g}[/tex] = 74.5%
Final answer:
To calculate the percent yield, compare the actual yield of H2O (0.745 grams) to the theoretical yield determined by stoichiometry and molar masses of reactants and products.
Explanation:
The student is asking how to calculate the percent yield of a chemical reaction. In this chemical reaction, 0.112 grams of hydrogen (H2) produces 0.745 grams of water (H2O). To find the percent yield, first we need to calculate the theoretical yield based on the stoichiometry of the reaction; then we compare the actual yield (0.745 grams) to the theoretical yield. The theoretical yield is calculated using the molar mass of H2 and H2O, converting grams of H2 to moles, and then using the stoichiometry given by the balanced equation to find the moles of H2O produced. These moles are then converted back to grams. The percent yield is the (actual yield / theoretical yield) x 100%. The stoichiometry of 4H2O to 4H2 implies a 1:1 mole ratio. Using the molar mass of H2 (approximately 2.02 g/mol) and H2O (approximately 18.015 g/mol), we can calculate the theoretical yield and then the percent yield.
What is the Bohr effect?
1. Determine the acid type for HBr.
O Brønsted-Lowry
O Ahrrenius
O Lewis
not a base
Answer:
Bronsted-Lowry
Explanation:
brainliest please ?
In a titration, 10.0 ml of 0.0750 M HCl(aq) is exactly neutralized by 30.0 ml of KOH(aq) of unknown concentration. What is the concentration of the KOH(aq)solution?
Answer: 0.0250
Explanation: 10 X 0.0750 = .75
.75 / 30 = 0.0250 M
The concentration of KOH(aq) solution is 0.025 M.
Explanation:In this titration, the volume and concentration of HCl(aq) are given as 10.0 ml and 0.0750 M, respectively. The volume of KOH(aq) is given as 30.0 ml. To find the concentration of KOH(aq) solution, we can use the concept of stoichiometry and the balanced equation for the reaction:
HCl(aq) + KOH(aq) → H2O(l) + KCl(aq)
From the balanced equation, we can see that the ratio of moles of HCl to KOH is 1:1. Therefore, the moles of KOH can be calculated as:
moles of KOH = moles of HCl = volume of HCl × concentration of HCl
Substituting the values:
moles of KOH = 10.0 ml × 0.0750 M = 0.750 mol
The concentration of KOH(aq) solution can be calculated using the moles of KOH and the volume of KOH(aq) solution:
concentration of KOH = moles of KOH / volume of KOH(aq)
Substituting the values:
concentration of KOH = 0.750 mol / 30.0 ml = 0.025 M
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why is the concentration of helium increased in some gas mixtures that divers breath in order to reduce the partial pressure of oxygen?
Answer:
Because of oxygen toxicity.
Explanation:
Oxygen toxicity.
Oxygen has been known to cause central nervous system (CNS) toxicity when the pressure gets higher. This toxicity can cause convulsions, and this can cause the diver to drown.
The current standard maximum safe oxygen working pressure is 1.4 atm ppO2. This is equal to 56.5m/185′ when breathing air (21% O2 / 79% N). Below that depth the fraction of oxygen in a breathing gas must be reduced, and in order to maintain this maximum pressure of 1.4 ppO2, Helium must be added.
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What resource is often compromised due to mining?
Answer:
Coal mining can compromised a lot of our resources one of it is the soil. It is because it eliminates the nutrients of the soil that can affect the vegetation, it destroys the wildlife and habitat. Also, it changes permanently the topography of the area mined.
Explanation:
edge 2020 just did it
One resource that is often compromised due to mining is water, as mining have significant effect on quality and quantity of water.
Resources are anything that can be used to satisfy a need or want. Resources can be natural, such as land, water, minerals, and wildlife, or they can be human made, such as tools, machines, buildings, and infrastructure.
Mining activities can have significant impacts on water quality and quantity, especially in areas with limited water resources or sensitive ecosystems.
Water can become contaminated by chemicals and heavy metals used in mining, such as cyanide, sulfuric acid, and mercury, which can have harmful effects on aquatic life and human health. Mining can also consume large amounts of water for processing and dust suppression, which can exacerbate water scarcity and competition with other users, such as agriculture and urban areas.
Therefore, mining can have significant impacts on water resources, which are essential for human health, ecosystem functioning, and economic development.
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Based on the equation below, how many moles of aluminum sulfate (Al2(SO4)3) will be produced from the reaction of 5.8 moles of aluminum hydroxide (Al(OH)3) and excess sulfuric acid (H2SO4)?
2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
A. 2.9 moles of aluminum sulfate
B. 3.9moles of aluminum sulfate
C. 5.8 moles of aluminum sulfate
D. 11.6 moles of aluminum sulfate
Answer:
a is the correct answer
Explanation:
i just did this question and it said a was right
The number of moles of aluminum sulfate produced from the 5.8 moles of aluminum hydroxide and excess sulfuric acid is 2.9 moles.
The balanced chemical equation can be given as:
2 Al(OH)₃ + 3 H₂SO₄ [tex]\rightarrow[/tex] Al₂(SO₄)₃ + 6 H₂O
In the above reaction, the stoichiometry of the amounts of each compound participating in the reaction is:
Al(OH)₃ - 2 moles
H₂SO₄ - 3 moles
Al₂(SO₄)₃ - 1 mole
H₂O - 6 moles
From the above observation, it can be assumed that for every 2 moles of aluminum hydroxide produce 1 mole of aluminum sulfate.
Then, the number of moles produced by 5.8 moles of aluminum hydroxide is x.
[tex]\text{moles of Al}_{2} (\text{SO}_{4} ){3} =\dfrac{\text{5.8moles of Al(OH)}_{3} \times \text {1 mole of Al}_{2} (\text {SO}_{4} ){3}}{\text {2moles of Al(OH)}_{3}}[/tex]
Thus, 2.9 moles of aluminum hydroxide will be produced from the 5.8 moles of aluminum hydroxide.
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hi:) i need help with q17. Thanks in advance:)
Answer:
Q17. D
Explanation:
A single line between 2 atoms represent a single covalent bond between a pair of electrons. There are 17 lines in the diagram hence there are 17 bonding pairs of electrons in the molecule.
Do count the double bond as 2 bonding pairs of electrons.
I NEED ANSWER TONIGHT PLZ!!!! :(
Which condition results in an activation energy that allows the reaction to occur more easily?
reducing the concentrations of reactant molecules
decreasing the temperature
decreasing the surface area of the particles
adding a catalyst
Answer:
I think adding a catalyst
Explanation:
From what I found, any of the first 4 don't work, reducing the concentrations of reactant molecules just decreases the chances of it reacting, decreasing the temperature does more or less the same, as it takes away energy, decreasing the surface area of the particles does more or less nothing in this situation, but for a reaction to occur, you need to add energy, which only the catalyst does. good luck!
What are the negative impacts global warming has on coastal communities?
Answer:
Climate change can affect coastal areas in a variety of ways
Explanation:
Final answer:
Global warming leads to sea level rise and extreme weather, threatening coastal communities with flooding, erosion, loss of habitat, and freshwater scarcity. Infrastructure must adapt, but preventive action, including reducing greenhouse gas emissions, is essential.
Explanation:
The negative impacts of global warming on coastal communities are profound and long-lasting. With current sea levels rising by approximately 0.25 meters, coastal cities face increased vulnerability to storm surges, which are exacerbated by high tides and heavy waves during storms. This not only threatens human structures but also contributes to the loss of biodiversity as ecosystems are disrupted. Furthermore, as the planet warms, polar ice caps and glaciers continue to melt, leading to a predicted rise in sea levels of two to four feet by 2100. This would result in widespread inundation of shorelines, reduction of island sizes, and possible disappearance of some islands. The alteration in the freeze-thaw cycle of the poles and glaciers may also lead to a lack of freshwater resources and an abundance of saltwater.
Changing patterns of precipitation due to climate change will require reconstruction of water management and food production infrastructures, with further impacts on ecosystems. The changing water flows can lead to the clearing of new areas for agriculture, road construction, and other developments, potentially impacting natural habitats and leading to a shift in biodiversity. Additionally, warming could introduce new economic activities in previously inaccessible Arctic regions, inevitably leading to further environmental degradation through infrastructure development.
Elements are arranged left to right, top to bottom, from smallest to largest, by ____________ _____________ .
Answer: increasing atomic number
Explanation: Elements are arranged left to right, top to bottom, from smallest to largest, of increasing atomic number.
Which substances are most likely acids? Check all that apply.
O CHA
OHI
NH3
HNO3
O
NaCl
Answer:
HNO3 is nitric acid. NH3 is ammonia, NaCl is common salt. O is an atom of oxygen. No idea about remaining.
Answer:
HI and HNO3 are acids
Explanation:
__1__ was used as an indicator because it is colorless in __2__ solutions and pink in __3__ solutions.
ANSWER:
1.) phenolphthalein
2.) neutral and acidic
3.) basic
Answer:
1.) phenolphthalein
2.) neutral and acidic
3.) basic
Explanation:
Answer: Phenolphthalein was used as an indicator because it is colorless in neutral and acidic solutions and pink in basic solutions.
Explanation:
Recall that in the lab we added enough of the base NaOH so that the indicator turned pink. Prior to the solution turning pink, the solution was acidic (HCl) → neutral. Furthermore, phenolphthalein is used as an indicator of basic solutions.
The equivalence/equilibrium point occurs at ph 7.
Phenolphthalein causes solutions to become pink around pH 8.2 (a basic pH). Therefore, we added slightly more NaOH than actually needed to neutralize the acid.
What is hexaboron monosilicide formula
The molecular formula for hexaboron monosilicide is B6Si, which indicates the compound contains six boron atoms and one silicon atom.
Explanation:The hexaboron monosilicide formula is B6Si. This formula denotes that there are six atoms of boron (B) and one atom of silicon (Si) in a molecule of hexaboron monosilicide.
It is identified as hexaboron because of the prefix 'hexa-' which signifies six in chemical nomenclature, referring to the six boron atoms. Similarly, the use of 'mono-' in monosilicide represents one silicon atom.
This compound exists in crystalline form as a superhard material, and is often studied in the field of material science.
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At which temperature would an object radiate the least amount of electromagnetic energy?
1the boiling point of water (100°C)
2the temperature at the stratopause (0°C)
3the temperature of the North Pole on December 21 (-60°F)
4room temperature (293 K)
At the temperature of the North Pole on December 21 (-60°F) an object radiates the least amount of electromagnetic energy.
What are electromagnetic radiations?Electromagnetic radiation consists of waves of the electromagnetic field, which pass through space and carry radiant energy. It involves microwaves, radio waves, infrared, visible light, UV radiation, X-rays, and gamma rays.
Electromagnetic radiation exhibit electromagnetic waves, which oscillate with the electric as well as magnetic fields. Electromagnetic waves are generated due to periodic motion in the electric field or magnetic field.
Depending on the periodic change in these waves that happens and the power formed, different wavelengths of the electromagnetic spectrum are generated. The effects of electromagnetic radiation on chemical compounds and biological organisms depend on the power of electromagnetic radiation and its frequency.
In order of increasing frequency of radiations and decreasing wavelength of radiations, these waves are arranged in the electromagnetic spectrum.
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Which of these compound interest options will give you the highest ending balance?
Compound monthly
Compound every other month
Compound every six months
Compound annually
4Na + O2 —> 2Na2O
In this chemical reaction, how many moles of Na2O will be produced if 2.90 moles of Na react completely? Express answer to three significant figures.
Answer:
3.91g
Explanation:
1. Use the equation mol = mass/Mr (Molecular Formula)
2. Use the information you have and put it into the formula 2.9/23 = 0.1260869565
3. Multiply 0.1260869565 by 62 (molecular formula of Na2O) - Formula rearranged to mass = mol × Molecular formula = 7.817391303
4. Divide by two to get two moles, as shown in the chemical equation
5. 3.9086956515
6. 3.91g to three significant figures
which of Newton's laws state that an object's acceleration is directly related to the net force applied and inversly related to the mass
Jamal does not produce enough insulin to regulate his blood sugar. What part of the endocrine system is most likely being affected?
Adrenalgland
Pancreas
Pituitary gland
Testes
Answer:
B pancreas, since the pancreas secretes insulin
Explanation:
Answer:
pancreas
Explanation:
Find the initial temperature of Aluminum if 35 g of it produces 781.2 Joules at the final temperature of 44.3 ºC.
Answer:
T initial = 19.55°C
Explanation:
Given data:
Mass of Al = 35 g
Energy produces = 781.2 J
Final temperature = 44.3°C
Initial temperature = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of Al is 0.902 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = Final temperature - initial temperature
Q = m.c. ΔT
781.2 J = 35 g×0.902 J/g.°C× (T final - T initial)
781.2 J = 35 g×0.902 J/g.°C× (44.3°C -T initial )
781.2 J = 31.57 j/°C× (44.3°C -T initial )
781.2 J/ 31.57 j/°C = (44.3°C -T initial )
24.75°C = (44.3°C -T initial )
24.75° - 44.3°C = -T initial
T initial = 19.55°C
A2.5 L sample of a solution of sea water has a NaCl concentration of 5.4
M. What is the new concentration of this solution if it is boiled down to a
volume of 1.0 L?
13.5 is the new concentration of this solution if it is boiled down to a
volume of 1.0 L.
Explanation:
Data given:
Initial volume of the solution of sea water = 2.5 litre
Molarity of NaCl solution M1 = 5.4 M
fInal volume = 1 litre
final molarity = ?
Assuming that no loss of NaCl from sea water took place when the sea water was boiled.
applying the formula for change in concentration as:
Minitial V initial = Mfinal X Vfinal
M final = [tex]\frac{M initial X V initial}{V final}[/tex]
Putting the values in the equation:
Mfinal = [tex]\frac{5.4 X 2.5}{1}[/tex]
M final = 13.5 M
thus it can be concluded that molarity will increase drastically when volume gets reduced from 2.5 litre to 1 litre. The solution becomes highly concentrated as water volume decreases due to evaporation.
The new concentration of a seawater solution initially at 5.4 M and 2.5 L volume, after boiling down to 1.0 L, is calculated to be 13.5 M using the principle of conservation of mass and the formula M1V1 = M2V2.
The question involves calculating the new concentration of a solution when its volume changes due to boiling. A 2.5 L sample of seawater with NaCl concentration of 5.4 M is reduced to 1.0 L after boiling. To find the new concentration, we use the principle of conservation of mass, which implies that the amount of solute (NaCl) remains constant even as the volume changes. Using the formula M1V1 = M2V2, where M1 and V1 are the initial concentration and volume, and M2 and V2 are the final concentration and volume, we can calculate the new concentration after boiling down to 1.0 L.
Initial information: M1 = 5.4 M, V1 = 2.5 L, V2 = 1.0 L.
Calculation: To find M2, rearrange the formula to M2 = (M1V1) / V2. Therefore, M2 = (5.4 M * 2.5 L) / 1.0 L = 13.5 M.
The new concentration of the NaCl solution after being boiled down to 1.0 L is 13.5 M. This demonstrates how the concentration of a solution increases as the volume decreases, provided no solute is added or removed.
If you increase the distance between two objects, the gravitational force between the two objects ____________.
What happens to particles when heat is removed from them?
Question 7 options:
They speed up and spread out
They stop moving They stop moving
They slow down and get closer together
They move closer together and speed up
SHOW ANSWER
Answer:
they slow down and get close together
Explanation:
low temperature lowers kinetic energy in particles hence they slow down and get close together thereby causing shrinking of the particles
Answer:
They slow down and get closer together
Explanation:
Hi:) for questions 8 & 9 , anyone able to explain why nitrogen is N2 instead of N. also why is chlorine cl2 instead of c1? Thank you!
Answer:
Because both of them are Diatomic molecules.
Explanation:
She found that the electromagnet picked up the entire pile of paper clips the instant she turned it on. Which of the following might allow Charlotte's electromagnet to pick up a single paper clip at a time? A. increasing the distance between the electromagnet and the paper clips B. increasing the number of batteries supplying voltage to the electromagnet C. increasing the number of loops in the electromagnet's coil D. removing the iron nail from the core of the electromagnet
Answer:
Increasing the distance
Explanation:
I dont know if this is right but i think it is since the magnets works at a distance so moving it away is the answer i think.
Answer:
it D and A
Explanation:
I solved this on study island before