Answers
Answer:
²³⁸₉₂U has 146 neutrons
Explanation:
To know which option is correct, we shall determine the number of neutrons in each case. This can be obtained as follow:
For ²⁴₁₂Mg:
Mass number (A) = 24
Proton number (P) = 12
Neutron number (N) =?
A = P + N
24 = 12 + N
Collect like terms
N = 24 – 12
N = 12
Thus, there are 12 neutrons in ²⁴₁₂Mg
For ⁷⁵₃₃As:
Mass number (A) = 75
Proton number (P) = 33
Neutron number (N) =?
A = P + N
75 = 33 + N
Collect like terms
N = 75 – 33
N = 42
Thus, there are 42 neutrons in ⁷⁵₃₃As
For ¹⁹₉F:
Mass number (A) = 19
Proton number (P) = 9
Neutron number (N) =?
A = P + N
19 = 9 + N
Collect like terms
N = 19 – 9
N = 10
Thus, there are 10 neutrons in ¹⁹₉F.
For ²³⁸₉₂U:
Mass number (A) = 238
Proton number (P) = 92
Neutron number (N) =?
A = P + N
238 = 92 + N
Collect like terms
N = 238 – 92
N = 146
Thus, there are 146 neutrons in ²³⁸₉₂U
Considering the options and the illustration made above, Only ²³⁸₉₂U has the correct number of neutrons written along side.
Related Questions
What is electrolysis
Answers
Answer:
Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them. Electricity is the flow of electrons or ions.
Explanation:
hope it helped:)))))
Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
Answers
Answer:
it should be B (i did this wrk before)
Explanation:
12) Balance the following chemical equation:
Zn +
H3PO4
Zn3(PO4)2 +
H2
Answers
Answer:
Sorry I am not very good at chemistry.
Explanation:
How many moles of NaCl are contained in 100.0 mL of a 0.20 M solution?
Answers
Answer:
0.02 mol.
Explanation:
A B C D ............
Answers
Answer:
I think gamma, I'm not sure tho
Name the 6 kinetic factors
Answers
The following symbol (<-->) means
Answers
Answer:
Greater than or less than
What is the answer:
C4H8+H2=
Answers
How is stoichiometry used to calculate the amount of product produced?
A. Stoichiometry measures the amount of product obtained.
B. Stoichiometry determines the molar mass of the product.
C. Stoichiometry calculates the grams of the limiting reagent.
D. Stoichiometry relates moles of product.
Answers
Answer:
Stoichiometry relates moles of reactant to moles of product
Explanation:
Just took the quiz :)
Answer:
Stoichiometry relates moles of reactant to moles of product.
Explanation: :)
UGRENT! Please help showing all work
Answers
Answer:
a. Oxygen
b. 2.62 g of NO
c. 85.2%
Explanation:
Let's see the presented reaction:
4NH₃ + 5O₂ → 4NO + 6H₂O
4 moles of ammonia react to 5 moles of oyxgen in order to produce 4 moles of NO and 6 moles of water.
To determine limting reagent, we need moles of each reactant. Let's calculate them:
3.25 g /17 g/mol = 0.191 moles
3.50 g /32 g/mol = 0.109 moles
4 moles of amonia react to 5 moles of oxygen
Then, 0.191 moles will react to (0.191 . 5) / 4 = 0.238 moles
We only have 0.109 moles available and we need 0.238, so the oxygen is the limting reactant.
5 moles of O₂ can produce 4 moles of NO
So, our 0.109 moles will produce (0.109 . 4) /5 = 0.0872 moles
We convert the moles to mass: 0.0872mol . 30g/mol = 2.62g
(Yield produced / Theoretical yield) . 100 = %
(2.23g / 2.62g) . 100 = 85.2%
help..................
Answers
Answer:
Volcanic eruption
Explanation:
a crater is this bowl shaped hole in the ground, and it is caused by a meteorite or volcanic activity
What is the molarity to the nearest hundredth of a solution made by dissolving 1.71 moles of NaOH in enough water to produce an 875 mL solution? (REMINDER THE VOLUME MUST BE IN L. 1000 ML = 1 L)
Answers
Answer:
Explanation:
50 is the volume
Answer: 1.95 mol/l
Explanation: molarity = concentration = amount of substance/volume.
Also v = n/V= 1.71 mol/ 0.875 litres= 1.9542857 mol/l
Drag each item to show if it is matter or not matter.
light bulb added to
sunlight
heat
lamp
matter
light bulb
not matter
Answers
Which one of the following to all methods of heat transfer require?
a. A difference in thermal energy
b. A liquid or gaseous state
c. Direct physical contact
d. The movement of particles
Answers
Answer:
A
Explanation:
A difference in thermal energy
The study of chemicals is called chemistry.
The correct answer is A.
According to the law of thermodynamics, It states that heat transfers from the high temperature to the low temperature.
According to the question, heat transfer must require the temperature difference between the two systems and allow to flow from high temperature to low temperature.
Hence, the correct answer is A that is a difference in thermal energy
For more information, refer to the link:-
https://brainly.com/question/14698383
50 points if its right In the Northern Hemisphere, choose ALL that apply
Question 2 options:
Summer solstice occurs when the Earth's North Pole is tilted toward the sun.
Fall and Spring Equinoxes occur when days and nights are equal in length.
The tilt and revolution of the Earth causes the seasons
Winter solstice occurs when the Earth's North Pole is tilted away from the sun.
Answers
Answer:
All are correct
Explanation:
I took the test
Answer: pick all
Explanation:
i got 100% on my qiuz
A H2CO3 (aq) ---> CO2 (g) + H2O (l) B H2SO4 (aq) + 2NaOH (aq) ---> Na2SO4 (aq) + 2H2O (l) C 2H2 (g) + O2 (g)----> 2H2O (l) D AgNO3 (aq) + NaOH (aq) ---> AgOH (s) + NaNO3 (aq) Which equation above represents a precipitation reaction?
Answers
Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The equation which represents a precipiation reaction is:
[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
What is the correct IUPAC name for the acid: H2Lv
Answers
How do ethnics affect scientific research ?
Answers
Answer:
A
Explanation:
scientists should not be allowed to conduct research that is harmful to others.
Can somebody help please
Answers
Answer:
98 moles of H₂O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2HCl + CaCO₃ —> CaCl₂ + H₂O + CO₂
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of H₂O.
Finally, we shall determine the number of mole of H₂O produced by the reaction of 98 moles of CaCO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of CaCO₃ reacted to produce 1 mole of H₂O.
Therefore, 98 moles of CaCO₃ will also react to produce 98 moles of H₂O.
Thus, 98 moles of H₂O were obtained from the reaction.
This is hard, isn't it? please help me though. PLEASE
Answers
In the Haber reaction shown below, _______?is the
limiting reactant if equal moles of each reactant are used.
3H2 + N2 -> 2NH3
Answers
Answer: hydrogen
Explanation:
How do changes to genes in body cells differ from changes to genes in egg and sperm cells?
Answers
Answer:
These genetic changes are not present in a parent's egg or sperm cells, or in the fertilized egg, but happen a bit later when the embryo includes several cells. As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not.
Explanation:
what is the effect of light on valence electrons?
Answers
Answer:
When a small amount of external energy in the form of light is applied to the conductor, the valence electrons gain enough energy from the light to break the bonding with the atom and they jumps into the conduction band.
The effect of light on valence bis absent negative charges in the valence band, correspond to electrons elevated to the conduction band. When the semiconductor is lit, current flow is increased by both electrons and holes.
Why are valence electrons important?The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction.
In general, when an atom's outermost electron shell is full, it is at its most stable and least reactive.
Thus, The valence electrons get enough energy from the light to break their link with the atom and move into the conduction band when a modest amount of external energy in the form of light is delivered to the conductor.
To learn more about the valence electron, follow the link;
https://brainly.com/question/28977387
#SPJ2
Find the mass of 1.59 mol of NH3.
Please show the work if you can!
Answers
Answer:
25.4/km=3
Explanation:
Which element has chemical properties most similar to carbon (C)?
A. Lithium
B. Silicon
C. Titanium
D. Neon
Answers
Answer:
b
Explanation:
Silicon has the chemical properties that are most similar to those of carbon
How many particles of CuCr2O7 are present in a 64.5 gram sample?
Answers
1.39 × 10²³ particles CuCr₂O₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 64.5 g CuCr₂O₇
[Solve] particles CuCr₂O₇
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of Cu - 63.55 g/mol
[PT] Molar Mass of Cr - 52.00 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of CuCr₂O₇ - 63.55 + 2(52.00) + 7(16.00) = 279.55 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 64.5 \ g \ CuCr_2O_7(\frac{1 \ mol \ CuCr_2O_7}{279.55 \ g \ CuCr_2O_7})(\frac{6.022 \cdot 10^{23} \ particles \ CuCr_2O_7}{1 \ mol \ CuCr_2O_7})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 1.38944 \cdot 10^{23} \ particles \ CuCr_2O_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.38944 × 10²³ particles CuCr₂O₇ ≈ 1.39 × 10²³ particles CuCr₂O₇
If the initial rate of H2 to disappear is 2.0 moles per second, what is the rate of appearance of NH3 at the same time? N2(g) 3 H2(g) ⇌ 2 NH3(g)
Answers
Answer:
1.33 moles per second
Explanation:
From the balanced equation of reaction, 3 moles of H2(g) need to disappear/be consumed before 2 moles of NH3(g) can be formed/appear.
According to reaction law, the rate of disappearance of reactants is equal to the rate of appearance of products.
Now, only 2 moles per seconds of H2 has disappeared initially;
3 moles H2 is needed for 2 moles NH3
2 moles H2 will give; 2 x 2/3 = 4/3 or 1.33 moles
Hence, if the initial rate of disappearance of H2 is 2.0 moles per second, the initial rate of appearance of NH3 would be 1.33 moles per second.
What organelle is sac like and stores different materials?
Group of answer choices
endoplasmic reticulum
vacuoles
ribosomes
Golgi Body
Answers
Please help fast. I will give brainliest!
Answers
Answer:
c=-1+x=varible+a=(5)^3
Explanation:
facts
which type of window is double glazed window
Answers
Answer:
Hope this helps and have a good day!
Explanation:
Double glazed is a fancy term for a window that has two panes of glass. There are also triple glazed windows (three panes). The multiple panes of glass in a single window frame helps with insulation.