Answers
Answer:
The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. Therefore, the number of electrons in neutral atom of Barium is 56
Explanation:
Element Barium
Number of protons 56
Number of neutrons (typical isotopes) 134-138
Number of electrons 56
Electron configuration [Xe] 6s2
Related Questions
Which of the following is not the same as 13.6 milliliters?
Answers
Answer:
Need choices
Explanation:
Your question suggest that there are answers to choose from. Need those to complete the question.
Answer:
it is 0.0136 dkl
Which of the following statements is not true about ions
Answers
Answer:
Cations form when an atom loses electrons.
14. Which group below correctly list bases that completely dissociate in water?
O a. NaOH, KOH, LIOH
O b. NH3, NH4OH, HCI
C. NaOH, H3PO4, MgOH
O d. NaOH, KOH, H2CO3
15. When the oxidation number increases the element is
decreases the element is
and if the oxidation number
O a. reduced, reduced
O b. reduced, oxidized
O c. oxidized, oxidized
O d. oxidized, reduced
16. The oxidation number for O in NaHCO3 is
O a. 1-
O b. 1+
O c. 2-
O d. 2+
17. The oxidation number for Na, Cr, and o respectively in the compound Na2Cro4
O a. 6+, 1+, 2+
O b. 1+, 6+, 2-
O c. 2-, 1+, 6+
O d. 1-, 2-, 3+
18. CuSO4 + 2NaOH --> Cu(OH)2 + Na2S04
The reaction above represents
O a. Oxidation
O b. Reduction
O c. Neutralization
O d. None of the above
19. A balloon with a volume of 5.0 L is filled with a gas at 2 atmospheres. If the pressure is reduced
to 1 atmospheres without a change in temperature, what would be the volume of the balloon?
O a. 5.0 L
b. 10 L
O c. 12 L
O d. 10 ml
Answers
Answer:14=D
15=B
16=D
17=C
18=A
19=D
Explanation: I did this and got a 100% °³°
Assign priorities in the following set of substituents according to Cahn-Ingold-Prelog rules.
-OCH3 -Br -Cl -CH2OH
А B C D
(Provide your ranking through a string like abcd, starting with the one with the highest priority).
Answers
Answer:
Assign priorities in the following set of substituents according to Cahn-Ingold-Prelog rules.
-OCH3 -Br -Cl -CH2OH
Explanation:
To give priorities for the substituents that are attached to chiral carbon and to assign either R or S-configuration the following rules were proposed:
1. The atom with the highest atomic number is given first priority.
2. If the Groups attached to chiral carbon are having the same first atom, then check for the atomic number of the second atom.
Among the given groups,
-Br has the highest atomic number, so it is given first priority.
Then, -Cl.
Then, -OCH3
and the last one is -CH2OH.
Hence, the order is :
BCAD.
An example of a chemical change A. Fireworks B. Chemical reaction C. Chemical change D. Energy
Answers
Both say chemical reaction
c) Discuss precision and Accuracy as they relate to types of errors.
what is the answer
Answers
Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.
Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.
Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.
Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.
Errors in measurements can be classified into two types: random errors and systematic errors.
Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.
Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.
In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.
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What mass of BaCl2 is needed to make 0.500 L of a 0.250 M BaCl2 solution ? A. 0.125g B. 2.00g C. 21.6g D. 26.0g
Answers
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the mass of barium chloride is 0.80g.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
Molarity= number of moles of solute÷ volume of solution in liter (1)
Where,
moles= given weight ÷ molecular weight
= w÷ 208.23 g/mol
Substituting values in equation 1, we get
0.250 M =(w/ 208.23 )/(0.500 L)
w=26.0g
Therefore, the mass of barium chloride is 0.80g.
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According to the article, elements are named by the number of protons in the nuclei.
Which paragraph BEST supports the idea outlined above?
A
The periodic table is getting a little bit longer, thanks to the addition of four super-heavy elements.
B
The discoveries of elements 113, 115, 117 and 118 were confirmed recently by the International Union of Pure and Applied Chemistry. The group vets the man-made elements seeking a permanent spot on the periodic table, a chart listing all the elements that hangs in science classrooms around the world.
C
Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus.
D
The new elements are known as super-heavy elements. Element 118, for example, is the heaviest element to date, with 118 protons alongside 176 neutrons.
Answers
The correct answer is: Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus; option C.
What is atomic number of an element?The atomic number of an element is the number of protons present in the nucleus of the atom of the element.
The nucleus is the center of the atom and is the heaviest part of the atom.
Another sub-atomic particle fund in the nucleus is the neutron.
Elements are named according to the number of protons in the nuclei.. This is because the number of protons in the nucleus of any given atom whereas the neutron number may vary, Also, electrons are easily removed from atoms of elements.
In conclusion, the number of protos in atom is used to name the atom.
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If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to
32.4°C, what is the specific heat capacity of the metal? (show your work)
Answers
Explanation:
here is the answer to your question babe
The specific heat capacity of the metal is 0.471 J/g°C .
How do we calculate specific heat?Specific heat of the metal will be calculated by using the below equation:
Q = mcΔT
Or c = Q/mΔT, where
m = mass = 40.7gQ = absorbed heat = 238JΔT = change in temperature = 32.4 - 20 = 12.4°COn putting all these values, we get
c = 238 / (40.7)(12.4) = 0.471 J/g°C
Hence value of specific heat capacity of metal is 0.471 J/g°C.
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Describe the liquid state of matter and give an example besides water.
Answers
what could have caused the mass to be higher than the initial mass
Answers
Answer:
Possibly the addition of oxygen from the atmosphere
Explanation:
The absorption of energy from atmosphere causes a rise in mass than the initial mass of a substance.
Absorption of energy can increase the mass of a certain substance while release of energy can decrease the mass of a certain substance. For example, when we freeze liquid water, it forms ice. So, its weight increases when it changes its state from liquid to solid. In the same way when liquid water is boiled, upon vaporization it forms water vapor, which is lighter in mass than liquid water. Thus, we can say that temperature also has a role to play in the increase and decrease of mass of a certain substance compared to its initial mass.
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The question should be
What causes the mass to be higher than the initial mass?
April investigated a crime scene where a gunshot sent blood through the air and it splattered on the wall. How would a forensic scientist BEST categorize this blood stain?
A.
transfer
B.
impact
C.
circular
D.
passive
Answers
A forensic scientist would best investigate categorize the blood stain by b) impact.
It is given that the blood is splattered on the wall. It was splattered by a gunshot and is also given that the blood traveled through air before splattering.
Since, it was a gunshot the trigger from the gun would surely create a force on the Blood which would push the blood to move forward.
This blood when falling onto the surface of the wall would create an impact depending upon the speed it traveled through the air.
Therefore, the crime scene would be best investigated and categorize the blood stain based on impact of the blood shot from the gun and can move to further investigation.
Hence the correct option is b) and the correct answer is impact.
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Tin(IV) sulfide, SnS2, a yellow pigment, can be produced using the following reaction.
SnBr4(aq)+2Na2S(aq)⟶4NaBr(aq)+SnS2(s)
Suppose a student adds 45.0 mL of a 0.605 M solution of SnBr4 to 53.8 mL of a 0.181 M solution of Na2S.
Identify the limiting reactant.
1) Na2S
2) NaBr
3) SnBr4
4) SnS2
Calculate the theretical yield of SnS2.
Answers
The limiting reactant is Na₂S and the theoretical yield of SnS₂ is 60.9%.
Moles of SnBr₄ = Molarity × volume (L)
= 0.605 mol/lit × 0.045 lit
= 0.02722 mole
Moles a Na₂S. = Molarity x volume (L).
= 0.181 mol/lit X 00538 (lit)
= 0.00973 mol
From the balanced chemical equation.
I mole of SnBr₄ = 2 mole of Na₂S
Multiply by 0.02722
0.02722 mole SnBr₄ = 2 x 0.02722 mol Na₂S.
Moles Na₂S required = 0.0544 mol
Moles of Na₂S Present = 0.00973 mol
Hence the limiting reactant is Na₂S.
2 Mole of Na₂S = 1 mole of SnS₂
1 Mole of Na₂S = 1/2 mole of SnS₂
multiply by 0.00973
0.00973 mol Na₂S = 0.009731 mol × 1/2 mol SnS₂
mole of SnS₂ = 0.004865 mol·
Gram of SnS₂ = No of moles x Molar mass
= 0.004865m × 182.89 g/mol
= 0.889 g
Percent. yield = Practical field / Theoretical yield × 100
= (0.541)/(0.889) × 100
= 60.85%
= 60.9%
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1. The center of the atom is called the
(10 Points)
O nucleus
O protons
electrons
neutrons
Answers
Net ionic equation for potassium sulfide and magnesium iodide
Answers
The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.
To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.
Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):
K2S -> 2K+ + S2-
Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):
MgI2 -> Mg2+ + 2I-
Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):
K+ + I- -> KI
Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):
Mg2+ + S2- -> MgS
Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:
2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS
To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).
Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:
S2- + Mg2+ -> MgS
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What is the product of the reaction?
Please answer with the correct answer! Thanks.
Answers
Answer:
compound
Explanation:
it is calcium oxide, also known as quicklime
characteristics. of. rusting
Answers
Answer: metal turn orange and weaker as it gets oxidised
Explanation:
Calculate the number of oxygen atoms in a 80.0 g sample of scheelite (CaWo).
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
Answers
Answer:
Explanation:
scheelite is CaWO₄
Mol weight = 288
80 g of scheelite = 80 / 288 = 27.77 x 10⁻² moles
27.77 x 10⁻² moles of scheelite = 27.77 x 10⁻² x 6.02 x 10²³ molecules of scheelite
= 167.17 x 10²¹ molecules of scheelite
1 molecule of scheelite contains 4 atoms of oxygen
167.77 x 10²¹ molecules of scheelite contains 4 x 167.77 x 10²¹ atoms of oxygen .
= 671.08 x 10²¹ atoms of oxygen .
= 671 x 10²¹ atoms .
starting with toluene which sequence of reactions below works best to prepare the folowing cyclohexadiene compound
Answers
The toluene which is sequence of reactions below the works best to prepare the following cyclohexadiene compound is given as follows :
NBS , heat NaOCH₃ Na, NH₃
Toluene ------------------> -----------------> ------------>
CCl₄ CH₃OH CH₃OH
The toluene is the substituted aromatic hydrocarbon. the cyclohexadiene is used as the starting material for the synthesis of the natural complex products. the cyclohexadiene can be formed by the toluene . the synthesis which is the best to prepare the cyclohexadiene from the compound that is toluene is given as follows :
NBS , heat NaOCH₃ Na, NH₃
Toluene ------------------> -----------------> ------------>
CCl₄ CH₃OH CH₃OH
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Light can bounce off objects. This is called reflection, and it's what allows us to see objects. This drawing shows a light ray reflecting from the blue construction paper. Although many light waves are hitting the paper and reflecting from it, showing just one ray helps us follow the path of a single wave. white light from flashlight blue light ray seen For each color of paper, which part of white light is reflected?
Answers
For each color of paper, the part of white light that is reflected depends on the color of the paper. When white light strikes an object, some of the light is absorbed by the object, some of it is transmitted through the object, and some of it is reflected.
The color of the object that we see is the color of the light that is reflected by the object.
For example, when white light strikes blue paper, the blue color of the paper absorbs all the other colors of the spectrum except blue, which is reflected back to our eyes. This is why we see the paper as blue. Similarly, when white light strikes red paper, the red color of the paper absorbs all the other colors except red, which is reflected back to our eyes. This is why we see the paper as red.
In summary, the color of an object is determined by the color of the light that is reflected by the object, and the color of the light that is reflected depends on the color of the object and the colors of the spectrum that are absorbed or transmitted by the object.
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What is the molarity of a CaCl2 solution containing 150g of CaCl2 in 400 mL?
Answers
Answer:
you have a 3.17molal solution: This is 3.17mol CaCl2 dissolved in 1 litre of water. Make this solution.
Molar mass CaCl2 = 110.9848 g/mol
3.17mol = 3.17*110.9848 = 351.822g
Total mass = 1000g H2O + 351.822g CaCl2 = 1,351.822g
Volume of this solution:
Volume = mass / density
Volume = 1,351.822/1.24
Volume = 1,090.2 mL
You have 3.17mol CaCl2 dissolved in 1,090.2 mL solution
Mol CaCl2 dissolved in 1000mL solution = 1000/1090.2*3.17 = 2.91 mol CaCl2
Molarity of CaCl2 solution = 2.91M
Explanation:
Write the base dissociation constant (Kb) equation.
Answers
When a base (BOH) disociates in water the following equilibrium takes place:
\(BOH\rightleftarrows OH^-+B^+\)Then the base dissociation constant (Kb) is expressed as:
\(Kb=\frac{[OH^-][B^+]}{[BOH]}\)It is the product of the concentration of the products devided by the concentration of the reactant
What is the best way to measure the pH of a natural solution while out in a forest?
Answers
The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.
1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.
2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.
3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.
4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.
5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.
6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.
7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.
By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.
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H3PO4(aq)+KOH(aq)→
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answers
Answer:
H3PO4(aq) +3KOH(aq) --> K3PO4 (aq) + 3H2O (l)
Explanation:
KOH + \(H_{3} PO_{4}\)→ \(K_{3} PO_{4}\) + \(H_{2}O\) We have a double replacement reaction for this reaction.
What is meant by double displacement reaction?In a double displacement reaction, two chemicals react and the positive (cation) and negative (anion) ions of the two reactants swap positions, creating two new compounds or products.
Thus, KOH + \(H_{3} PO_{4}\)→ \(K_{3} PO_{4}\) + \(H_{2}O\) We have a double replacement reaction for this reaction.
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An electric immersion heater is put at the bottom of a large tank of water.
The water next to the heater becomes warm.
(i)
What will happen to the warmed water next to the heater?
Give a reason for your answer.
Answers
An electric immersion heater is put at the bottom of a large tank of water the water next to the heater becomes warm then warmed water next to the heater energy will travel up from the heater through the particles
The water is heated up from the inside and usually with electricity a strong electric current run through a large element inside the tank to directly heat the water around it and energy will travel up from the heater through the particles and making them faster and further apart and meaning they become less dense and when water is heated with immersion heater the water become less dense due to which the warm water rises up and the cooler water fill its space
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The chemical reaction of hydrogen with oxygen produces water.
2H₂(g) + O₂(g) → 2H₂0 (g)
a. How many moles of O₂ are required to react with 2.6 moles of H₂?
b. How many moles of H₂ are needed to react with 5.0 moles of O₂?
Answers
Answer: a
explanation: Make a ratio of the number of moles and do the calculations. Do you get it?
Which is the first step in the fusion process?
Answers
Explanation:
The first step of the Hydrogen fusion process: a nucleus of Deuterium (2H) is formed from two protons with the emission of an antielectron and a neutrino. The basic Hydrogen fusion cycle involves four Hydrogen nuclei (protons) and two electrons and yields a Helium nucleus, two neutrinos and six photons.
Answer:
C just took it
Explanation:
For a concave mirror, incident light beams through C will reflect:
(a) back through C
(b) through F
(c) parallel to PA
Answers
Answer:
c
Explanation:
Solar and wind energy are both intermittent resources that cannot be relied upon for a constant stream of energy production. Explain why developing better ways to store energy is an important part of making these energy sources more practical to use.
Answers
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.
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A dam constructed to produce tidal power does so by _____. reducing the range between high tide and low tide harnessing water flow to drive turbines and electric generators protecting a coastal area from large ocean waves preventing saltwater from moving from the ocean into a bay
Answers
A dam constructed to produce tidal power does so by harnessing water flow to drive turbines and electric generators .
What purposes does tidal energy serve?Tidal energy was employed in grain mills to crush grains mechanically, just like wind energy was. grain crushing Here, the tidal energy generated by the turbines was used. Hydroelectric dams, which serve as significant energy storage, also employ tidal energy to store energy.
Tidal power can harm marine life because tidal turbines' whirling blades can cause marine organisms to perish. Fish habitations in tidal power settings may be impacted by noise from the turbines' rotation. Tidal energy can also affect how sediment and water are processed.
Therefore, option B is correct.
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