An isotope contains 47 protons, 47 electrons, and 60 neutrons. What is the identity of the isotope?
Answers
Answer:
To find the identity of the isotope we must first calculate the mass number
Mass number (M) = A + Z
Where
A is the atomic number
Z is the neutron number
A = 47
Z = 60
M = 60 + 47 = 107
From the options above
The answer is option A
Hope this helps you
Related Questions
What is another name for group 14 A.GRoup 4 B.Group 4A C.GRoup 4b D.GRoup 14a
Answers
Answer:
A. Group 4
Explanation:
Also called carbon family or the tetrels
Answer:
4a
Explanation:
Calculate the concentration, in units of dm-3, of sulfuric acid, H2SO4, which has a solubility of 2 mol dm-3. [Relative atomic mass: H = 1, O = 16, S = 32]
Answers
Answer:
196 gdm-3
Explanation:
There are two major units of concentration, moldm-3 and gdm-3. The first unit refers to molar concentration while the second unit refers to mass concentration. Both units are useful in chemistry when describing the concentration of solutions as deemed expedient in each particular case.
Here we are required to compute the mass concentration from the molar concentration. We must recall that; mass concentration= molar concentration × molar mass
Let us first obtain the molar mass of H2SO4 from the relative atomic masses given=
2(1) + 32 + 4(16) = 98 gmol-1
Molar concentration of H2SO4 = 2 moldm-3
Mass concentration= 2 moldm-3 × 98 gmol-1
Mass concentration = 196 gdm-3
400 ml of a 75 M solution of H2SO4 is needed to for a lab. The stock solution is 16.0 M. Calculate how much stock is needed to make the solution.
Answers
Answer:
The volume of stock solution needed to make the solution is 1875 ml
Explanation:
The parameters given are;
The volume of 75 M solution of H₂SO₄ = 400 ml
The concentration of stock solution = 16.0 M
Number moles per liter of stock solution = 16 moles
Number of moles in required 400 ml solution = 0.4×75 = 30 M
Volume of stock solution that contains 30 M = 30/16×1 = 1.875 l
The volume of stock solution that is required = 1875 ml
What volume of Co2 (carbon (iv) oxide)
will be produced when 10g of Na2Co3
(sodium trioxocarbonate (iv) reacted
with excess Hcl (Hydrogen Chloride) at
STP(Na=23, C=12, O=16)
Answers
Answer:
2.1056L or 2105.6mL
Explanation:
We'll begin by calculating the number of mole in 10g of Na2CO3. This can be obtained as follow:
Molar mass of Na2CO3 = (23x2) + 12 + (16x3) = 106g/mol
Mass of Na2CO3 = 10g
Mole of Na2CO3 =.?
Mole = mass /molar mass
Mole of Na2CO3 = 10/106
Mole of Na2CO3 = 0.094 mole
Next, we shall determine the number of mole CO2 produced by the reaction of 0.094 mole of Na2CO3. This is illustrated below:
Na2CO3 + 2HCl —> 2NaCl + H2O + CO2
From the balanced equation above,
1 mole of Na2CO3 reacted to produce 1 mole of CO2.
Therefore, 0.094 mole of Na2CO3 will also react to 0.094 mole of CO2.
Next, we shall determine the volume occupied by 0.094 mole of CO2 at STP. This is illustrated below:
1 mole of a gas occupy 22.4L at STP. This implies that 1 mole CO2 occupies 22.4L at STP.
Now, if 1 mole of CO2 occupy 22.4L at STP, then, 0.094 mole of CO2 will occupy = 0.094 x 22.4 = 2.1056L
Therefore, the volume of CO2 produced is 2.1056L or 2105.6mL
18. An electric motor turns a belt that powers a pump. If this system is compared to the chemical reactions of the cell, which part represents
ATP?
the electric motor
the pump
the belt
Answers
Answer:
A. the electric motor
Explanation:
A cell is a biological molecule which is the basic and functional unit of life. Cells undergo series of processes to function appropriately. ATP is an acronym for adenosine triphosphate, which is the source of energy for various cell processes.
In the given mechanical system, the electric motor provides the energy required energy to drive the system. Therefore, the electric motor has the same major function of providing energy for the system as the ATP in a cell.
15. Discuss the various factors which affect the rate of evaporation. Latent heat
evaporation of two liquids A and B is 100 J/kg and 150 J/kg respectively. Which
can produce more cooling effect and why? (5)
Answers
Answer:
The correct answer is liquid B.
Explanation:
Latent heat of vaporization also known as the latent heat of evaporation. This latent heat transforms the particles of liquid into a gas without affecting its temperature. For example, the latent heat of evaporation for water is 40.8 kJ per mole, that is, 40.8 kJ per mole of heat is needed to transform water into vapor at 373 K.
It is known that latent heat of evaporation of a liquid is directly proportional to the cooling effect it generates, that is, more the latent heat of evaporation more will be its cooling effect. Thus, it is clear that liquid B will show the more cooling effect as the latent heat of evaporation of liquid B is more in comparison to liquid A. Thus, more heat will be captivated by liquid B and will generate more cooling effect in comparison to liquid A.
why aqueous solution of ethanol does not conduct electricity while an aquoes solution of ethanoic acid conducts electricity
Answers
Answer:
Explanation:
because ethanoic acid dissocaites into H+ and actetate ion so there is positive and negative chaeges to carry the electrons while ethanol only got evenly distributed in the water.
. The four metals, Strontium(Sr), Francium (Fr), Yttrium (Y), and Europium (Eu), in separate experiments, are dipped in aqueous solutions of SrNO3, FrNO3, Y(NO3)3, and Eu(NO3)2. The following results are obtained: 1. Yttrium metal does not react with any of the solutions 2. Strontium metal reacts with all of the other metals solutions 3. Francium metal reacts in a solution of Eu(NO3)2 a) List the four oxidizing agents in order from strongest to weakest by creating a small reduction table. Explain your reasoning below b) List the four reducing agents in order from strongest to weakest
Answers
Answer:
a) Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
b) Sr > Fr > Eu > Y
Explanation:
Y is the least reactive metal because it does not react with any of the other solutions.
Sr is the most reactive metal because it reacts with all of the other solutions.
Sr + 2Fr⁺ ⟶Sr²⁺ + 2Fr
3Sr + 2Y³⁺ ⟶ 2Sr²⁺ + 2Y
Sr + Eu²⁺ ⟶ Sr²⁺ + Eu
Fr is more reactive than Eu because it reacts with Eu(NO₃)₂.
2Fr + Eu²⁺ ⟶ 2Fr⁺ + Eu
The order of reactivity is
Sr > Fr > Eu > Y
b) Reducing agents
In each of the above reactions. the more reactive metal is acting as a reducing agent — it is donating electrons to the cation of the other metal.
Thus, the order of activity of reducing agents is
Sr > Fr > Eu > Y
a) Oxidizing agents
The metal cations are the oxidizing agents.
The order of reactivity of the oxidizing agents is the reverse order of the reducing agents
Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
c) Standard reduction potential table
See the image below.
in the Leclanch dry cell ,which is electrolyte substance ?
Answers
Answer:
hey there,
ammonium chloride is the electrolyte substance in the Leclanche dry cell!
Explanation:
HELP PLEASEE 100 POINTS
The Quiver tree grows in Southern Africa. Which of the following plant adaptations is likely to prevent these trees from dying out due to rising desert temperatures?
O Releasing a black powder onto their trunk to absorb more heat from sunlight
O Shifting their growing range towards the equator
Ability to store water in leafy structures to prevent excess evaporation
O Limiting seed dispersal to nearby locations
PLEASE HELP 100 POINTS !!
Answers
Answer:
Shifting their growing range towards the equator
Explanation:
Maybe will be like that
Answer:
Ability to store water in leafy structures to prevent excess evaporation.
Explanation:
The reason why plants die in hot temperature is the excess evaporation of water, so to prevent the excess evaporation of water, the plants get adaptive to store water in their leaves.
Hope it helps.
The atomic size of sodium is smaller than that of the sodium why?
Answers
Name each of the following binary compounds or ionic compounds with polyatomic ions: 1. LiBr 2. Cal2 3. Al203 4. Mg3N2 5. FeCl2 6. FeCl3 7. Cu3N2 8. Ni2O3 9. Al(SO4)3 10. Ca3(PO4)2 11. Fe(OH)2 12. (NH4)2S 13. Na2O 14. NH3 15. SO42-
Answers
Answer:
Explanation:
1. LiBr - Lithium bromide
2. Cal₂ - Calcium iodide
3. Al₂0₃ - Aluminium oxide
4. Mg₃N₂ - Magnesium nitride
5. FeCl₂ Ferrous chloride [ Iron(II) chloride ]
6. FeCl₃ Ferric chloride [ Iron(III) chloride ]
7. Cu₃N₂ Copper nitride
8. Ni₂O₃ Nickel(III) oxide
9. Al(SO4)₃ Aluminium sulphate
10. Ca₃(PO4)₂ Copper phosphate
11. Fe(OH)₂ Iron (II) hydroxide
12. (NH4)₂S Ammonium sulphide
13. Na₂O Sodium oxide
14. NH₃ Ammonia
15. SO₄²⁻ Sulphate ion
1. Which of these items wastes sound energy?
-car radio
-alarm clock
-washing machine
-smartphone
Answers
Answer:
washing machine
Explanation:
the sound from a washing machine is not beneficial in any way
Using logarithms, you determined the A)Solubility B)Temperatures C)ph
of 7 solutions ranging from
strong acid to neutral to strong base.
Answers
Answer:
the answer is pH
Explanation:
Just took it on ed2020
Answer:
The first part is pH
The second part is calibrate
The third part is all three
Using various concentrations of HCl and NaOH to measure a range of pH
Using an existing scale to determine pH
Knowing that the cabbage indicator always has the same color at a given pH value
Explanation:
Explain the three states of matter on the basis of characteristics of particles/ molecules of matter.
Answers
Answer :
Explanation For The Three States OF Matter On the Basis OF Characteristics Of Particles / Molecules OF Matter.
Solid:In solids the molecules are closely packed . There is a strong force of attraction between the molecules and the space between them is very small (almost negligible). The molecules are , therefore, not free to move . They merely vibrate their mean positions . This makes solids hard and difficult to compress , giving them a fixed shape and size.
Liquid :In the case of liquids , the molecules are not closely packed. They do not attract each other as strongly as the molecules of solids. Thus, the intermolecular spaces are larger and the molecules are able to move about more freely . This makes liquid flow and take the shape of the container into which it is poured. Thus, liquids have a fixed volume but no definite shape of their own .
Gas :In the case of gases, the molecules hardly attract each other. They lie far a part from each other and the intermolecular spaces are, therefore, very large. . The intermolecular force of attraction is so weak that the molecules have great freedom of movement . As a result , gases have neither a fixed shapenor a fixed volume . They completely full up spacw available to them. They can be easily compressed as well, thus decreasing the gaps between their molecules .
Explanation :
Hope it works out !DETAILED Description on the applications of Nanochemistry.... about 100 words for each( note: has to be detailed)
Answers
Answer:
Explanation:
Nanochemistry is a branch of nanoscience, deals with the chemical applications of nanomaterials in nanotechnology.
Nanochemistry involves the study of the synthesis and characterisation of materials of nanoscale size.
what is the chemical test to differentiate ethanol from ethanoic acid
Answers
Answer:
Sodium hydrogencarbonate or sodium carbonate
2KCIO3 -- 2KCL+3o2 is a balanced equation
a) state what is a balanced equation
b) Give a reason why the above equation is balecand
Answers
Answer:
a) Balanced equation:
An equation is called balanced if there are same number and same type of atom on both sides of the equation.
b)Reason:
2KClO3--------2KCl + 3O2
Consider this equation in the reactants there are 2KClO3 and in the product there are 2KCl+3O2 . So reactants =products which is a case of balanced chemical equation .
Explanation:
what causes convection in currents in the air? a. the revolution of the earth around the sun. b. the rotation of the earth around itself. c. the heat on the surface of the earth. d. conversion of solid-gas directly
Answers
Answer:
THE HEAT ON THE SURFACE OF THE EARTH
Explanation:
Answer:
Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
Explanation:
Which topic is commonly used to explain activation energy and how chemical reactio
reaction rate
collision theory
velocity distribution
spontaneous reaction
Answers
Answer:
The answer is collision theory
I hope this helps you.
At 127°c,400ml of a gas exerts a pressure of 120 torr. What would be the pressure exerted by 200ml of a gas if the temperature decrease to 27°c?
Answers
Answer:
180 Torr.
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial temperature (T1) = 127 °C
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 27 °C
Final pressure (P2) =..?
Step 2:
Conversion of celsius temperature to Kelvin temperature.
This is illustrated below:
Temperature (Kelvin) = Temperature (celsius) + 273
T(K) = T(°C) + 273
Initial temperature (T1) = 127 °C
Initial temperature (T1) = 127 °C + 273 = 400 K
Final temperature (T2) = 27 °C
Final temperature (T2) = 27 °C + 273 = 300 K
Step 3:
Determination of the final pressure.
This can be obtained by using the general gas equation as shown below:
Initial temperature (T1) = 400 K
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 300 K
Final pressure (P2) =..?
P1V1/T1 = P2V2/T2
120 x 400/400 = P2 x 200/300
120 = P2 x 2/3
Cross multiply
P2 x 2 = 120 x 3
Divide both side by 2
P2 = (120 x 3)/2
P2 = 180 Torr.
Therefore, the new pressure exerted by the gas is 180 Torr.
Which could cause topsoil to be lost? a) wind and water erosion b)lack of use c)compaction d)desertification
Answers
Answer:
Which could cause topsoil to be lost?
a) wind and water erosion
Explanation:
A natural and common cause of soil erosion is Water. Water can carry away tiny soil particles.
Raindrops can impact the soil surface and can break down the aggregates in soil and scatter them.
Water runoff is another cause of soil erosion and this occurs when water on a slope isn’t absorbed into the soil or becomes trapped on the surface.
Loose particles can be picked up and carried away by the wind.
Soil surfaces can be worn down when struck by airborne particles carried by the wind.
B. Lack of use of the top soil rather helps the top soil to regain its nutrients.
c. Compaction can the topsoil from losing particles, since there are no loose particles to be picked up.
D. Desertification mostly causes the soil to lose its nutrients, not go away completely.
Hope this helps!
Answer:
The correct answer is A
Explanation:
What is the name of the Group 17 elements ?
Answers
Answer:
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
The name of the Group 17 elements is called halogens
What is the name of group 17 elements?The group 17 elements are very reactive elements. Members of this group include:
Fluorine (F)Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)The group 17 element are known to produce salts as they react with metals. Hence, they are called halogens
The group 17 elements are have 7 valence electrons and they required one electron to attain the stable octet configuration of the noble gas family.
From the above, we can see that the name of group 17 elements is halogens
Learn more about group 17 elements:
https://brainly.com/question/28295393
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When compound A (C5H12O) is treated with HBr, it forms compound B (C5H11Br). The 1H NMR spectrum of compound A has a 1H singlet, a 3Hdoublet, a 6H doublet, and two 1H multiplets. The 1H NMR spectrum of compound B has a 6H singlet, a 3H triplet, and a 2H quartet. Identify compounds A and B.
Answers
Answer:
attached here is the diagram of the solution
Explanation:
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule? monosaccharide disaccharide monomer starch
Answers
Explanation:
lactose is disaccharide
because it contains 1 monosaccharide galactose +
1 monosaccharide glucose
The correct answer to the question is: disaccharide
Monosaccharides are simple sugar which can not be hydrolysed into simpler or smaller molecules.
Disaccharides are sugars produced by the condensation of two monosaccharides with the elimination of a water molecule.
monosaccharide + monosaccharide <=> Disaccharide + waterA Monomer is a small molecule which can combine with other similar molecules to form a large molecule called polymer. Thus, a monomer of starch is simply a small molecule that combines together to form a polysaccharide called starch. The monomer of starch is glucose.
Glucose and galactose combined to form lactose i.e
Glucose + Galactose => LactoseThe above is simply a demonstration of how disaccharides are produced.
Learn more: https://brainly.com/question/20336107
In which situation would hydrogen bonding be present?
A. When hydrogen exists as an ion in solution
B. When hydrogen is attached to C, S, or P
C. When hydrogen is attached to N, F or o
D. When hydrogen atoms bond together to form H2
Answers
Answer:
C
Explanation:
hydrogen Bond exists between ammonia, hydrogen flouride and water so the answer is C
Which statement Ilustrates the difference between a chemical reaction and a nuclear reaction?
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
Answers
Answer:
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
Explanation:
In nuclear reactions there arises a shift in the nucleus of the atom. This results in the production of a different element altogether. While in chemical reactions the electrons are rearrangement and there is no change in the nucleus.Factors like temperature, pressure, and catalysts do not affect the rate of nuclear reactions while they influence the chemical reactions.The change in the energy is higher in nuclear reactions. It arises out of the destruction of mass.Answer:
A
Explanation:
Edge 2021
WILL GIVE BRAINLIEST Which effect is one likely result of a forest fire? a. extinction b. adaptation c. speciation d. forced migration
Answers
Answer:
d. forced migration
Explanation:
Certain hazardous occurrences affect living organisms in their natural habitat. One of those occurrences is forest fire. Forest fire or vegetation fire is an uncontrollable break out of fire in a vegetation, affecting the inhabitants of the area.
The occurrence of a forest fire will lead to a forced migration of organisms from their natural habitat. Animals and other mobile organisms will be forced to leave behind their devastating habitat and migrate to a less threatened area in order to survive.
Answer:
D
Explanation:
The guy above is correct but I’m saying this for those who don’t want an explanation
CALCULATE THE VOLUME OF 16 g OF OXYGEN GAS AT S.T.P?
Answers
Answer:
To calculate the volume we must first find the number of moles
Number of moles (n ) = mass / Molar mass (M)
Since oxygen is diatomic
M of oxygen = 16 × 2 = 32g/mol
n = 16 / 32 = 0.5mol
Next we use the formula
V = n × V(dm³)
where V is the volume
V(dm³) is the volume of 1 mole of a substance at s.t.p which is
22.4dm³
Volume of oxygen gas at s.t.p is
0.5 × 22.4dm³
= 11.20dm³
Hope this helps you
A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mmHg. The flask is opened and more gas is added to the flask. The new pressure is 795 mmHg and the temperature is now 26 °C. There are now __________ mol of gas in the flask.
Answers
Answer:
The new moles of the gas in the flask is 2.13 moles.
Explanation:
Given;
number of moles of gas, n = 1.9 mol
temperature of the gas, T = 21 °C = 21 + 273 = 294 K
pressure of gas, P = 697 mmHg
volume of gas, V = ?
Apply ideal gas law;
PV = nRT
Where;
R is gas constant, = 62.363 mmHg.L / mol. K
V = nRT / P
V = (1.9 x 62.363 x 294) / 697
V = 49.98 L
New pressure of the gas, P = 795 mmHg
New temperature of the gas, T = 26 °C = 273 + 26 = 299 K
New moles of the gas, n = ?
Volume of the gas is constant because volume of the flask is the same when more gas was added.
n = PV / RT
n = (795 x 49.98) / (62.363 x 299)
n = 2.13 moles
Therefore, the new moles of the gas in the flask is 2.13 moles.