Answer: 35/13
Explanation:
A researcher wants to experiment with an element that reacts like sodium (na) but has a greater atomic mass. which element should the researcher select for the experiment?
Answer: iodine
Explanation:
please help 100 points.
Answer:
Look up the periodic table and it will tell you what is what or you can ask for a hint and if that doesn't help look up "beryllium Atomic number, Mass number, Protons, electrons, and Neutrons." and do that for the rest of them.
Answer:
dw I gotchu
Explanation:
Complete the following word equations
Magnesium + water
Answer:
Magnesium reacts with hot water or water vapour to form Magnesium hydroxide and hydrogen gas.
Explanation:
calculate the force of attraction in n between a cation with a valence of 2 and an anion with a valence of 3 the centers of which are separated by a distance of 6.9 nm
The force of attraction in between a cation with a valence of 2 and an anion with a valence of 3 would be 1.5 x [tex]10^{-10}[/tex] N.
Force of attractionAccording to Coulomb's law constant,
k = 9 x 10^9 Nm^2/C^2
The magnitude of the charge of an electron is
e= 1.6 x 10^9 C
The magnitude of the electric force (F) between the cation and the anion is given by
F = k Q^2/d^2
= k 2e^2/d^2
= (9 x 10^9 Nm^2/C^2) x 10^9 x {2x (1.6 x 10^-19)^2}/ (2.5)^2
= 1.5 x 10^-10 N
To know more about force of attraction, visit:
https://brainly.com/question/2396709
#SPJ4
Calculate the molarity of Br- in 150.0 mL of aqueous solution that contains 5.07 g of zinc bromide
The molarity of the bromide ion, Br¯ in the solution is 0.3 M
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the molarity of the zinc bromide, ZnBr₂Mass of zinc bromide = 5.07 gMolar mass of zinc bromide = 225.198 g/molMole of zinc bromide = 5.07 / 225.198 = 0.0225 moleVolume = 150 mL = 150 / 1000 = 0.15 LMolarity of zinc bromide =?Molarity = mole / Volume
Molarity of zinc bromide = 0.0225 / 0.15
Molarity of zinc bromide = 0.15 M
How to determine the molarity of bromide ion, Br¯Dissociation equation
ZnBr₂(aq) -> Zn²⁺(aq) + 2Br¯(aq)
From the balanced equation above,
1 mole of ZnBr₂ contains 2 moles of Br¯
Therefore,
0.15 M ZnBr₂ will contain = 0.15 × 2 = 0.3 M Br¯
Thus, the molarity of bromide ion, Br¯ in the solution is 0.3 M
Learn more about molarity:
https://brainly.com/question/9468209
#SPJ1
A 5. 00 gram sample of lead and a 3. 20 g sample of iron are placed into 367 ml of water. What will be the new volume level of water in units of ml? the density of lead is 11. 34 g/cc and the density of iron is 7. 874 g/cc. Do not enter ""ml"" as part of your answer.
without the unit (ml), the answer is 368.
What does the term "density" mean?Density is the number of things (people, animals, plants, or objects) in a given area. To calculate density, divide the number of objects by the area measurement. A country's population density is the number of people divided by its area in square kilometers or miles.Density is dependent on mass and volume of a substance and can be defined as the ratio of mass to volume.In other words:
density = mass/volume
or
volume = mass/density
In this case, we need to determine the volume of added lead and iron to figure out the final volume of the water sample.
Volume of lead = mass of lead / density of lead = 5 gm / 11.34 g/cc = 0.441 cc or 0.441 ml
Similarly,
volume of iron = mass of iron / density of iron
= 3.2 g / 7.874 g/cc
= 0.406 cc or 0.406 ml
The new volume of water sample = original volume of water + volume of lead + volume of iron = 367 ml + 0.441 ml + 0.406 ml = 367.847 ml
To the 3 significant figures and without the unit (ml), the answer is 368.
To learn more about density refer to
https://brainly.com/question/24419453
#SPJ4
Which of the following sequences describes how a four-stroke engine cycle
powers the engine?
The four-stroke engine cycle is defined by the following steps air and fuel intake, compression and ignition, combustion and expansion, and exhaust.
The correct option is B.
What is four stroke engine cycle?A four-stroke engine cycle is a style of engine in which the piston ignites internal combustion.
The entire piston travel along the cylinder is referred to as a stroke in an engine. The order in which the processes in the engine occur is as follows:
Injection: During this procedure, the engine is injected with both air and fuel.Ignition: After the intake materials are crushed, they are ignited.Fuel is burned after being ignited, and expansion occurs once more as a result of the products that are produced during the combustion event.Exhaust: In this stage, a piston forces the engine's burned gases out of the system.To know more about Four stroke engine visit:
https://brainly.com/question/10050506
#SPJ9
The complete question is-
Which of the following sequences describes how a four-stroke engine cycle powers the engine?
A. Expansion, air and fuel intake, compression and ignition,
extinguishment
B. Air and fuel intake, compression and ignition, combustion and
expansion, exhaust
C. Hydrogen and fuel intake, expansion, compression and ignition,
exhaust
D. Contraction, compression and ignition, air and fuel intake, exhaust
The graph below shows how solubility changes with temperature.
A graph with the horizontal axis showing temperature ranging from 0 to 10 in units of 10 and the vertical axis solubility in grams of salt per 100 grams of water. Several compounds are shown. All data are approximate. The substances and their coordinates are as follows: upper N a upper C l: 0, 38; 10, 38; 20, 38; 30, 38; 40, 39; 50, 39; 60, 39; 70, 40; 80, 40; 90, 40; 100, 40. Upper N a subscript 2 upper H upper A s upper O subscript 4: 0, 5; 10, 18; 20, 28; 30, 39; 40, 49; 60, 65; 80, 82. Upper B a (upper N upper O subscript 3) subscript 2: 0, 5; 10, 8; 30, 12; 40, 15; 50, 18; 60, 20; 80, 28; 100, 33. Upper N a subscript 2 upper S upper O subscript 4: 0, 5; 5, 8; 10, 10; 15, 15; 20, 20; 25, 20; 28, 35; 30, 40; 32, 49; 33, 50; 35, 50; 40, 48; 50, 47; 60, 46; 70, 45; 80, 43; 90, 32; 100, 40. Upper C 3 subscript 2 (upper S upper O subscript 4) subscript 3 dot 9 upper H subscript 2 upper O: 0, 18; 20, 10; 30, 8; 50, 5; 60, 3; 80, 1; 100, 0.
Which two solutions have similar solubilities at 40°C?
Na2SO4 and NaCl
Na2HAsO4 and NaCl
Na2HAsO4 and Na2SO4
Ba(NO3)2 and Ce2(SO4)3 • 9H2O
Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepare. Na₂HAsO₄ and Na₂SO₄ is the correct option.
The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair. The amount of a solute that dissolves in a specific volume of liquid is known as its solubility.
In terms of solubility, solute volume divided by solvent volume o
Saturated, unsaturated, and extremely saturated solutions are all possible.
The solubility of solutes increases as the temperature rises.
Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepared.
Learn more about solubility here-
https://brainly.com/question/28170449
#SPJ9
Answer:
C
Explanation:
Na2HAsO4 and Na2SO4
Why is an acid able to produce ions in aqueous solution? assume that the general formula of an acid is given by ha, where a is usually a halogen or oxygen atom.
Acids separate into ions in water or other aqueous solutions. These are in charge of how electricity conducts through them. In the absence of water, acids do not dissociate hydrogen ions. We can therefore state that acids exclusively create ions in watery solutions.
The polar H-A bond breaks due to the attraction between H and the O of water
An aqueous solution is one in which water serves as the solvent. Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula. For instance, Na +(aq) + Cl might be used to indicate a solution of table salt, or sodium chloride (NaCl), in water (aq).
Aqueous solutions are those in which water serves as the solvent. Even though water is a great solvent, not everything readily dissolves in it.
Learn more about aqueous solutions:
https://brainly.com/question/24658038
#SPJ4
Which item can only be observed using some kind of instrument?
1.heat from the Sun
2.the planet Venus
3.a radio signal
4.an earthquake
PLEASE SOMEONE HELP ME WITH THIS!!!!!!
NO NEED FOR EXPLANATION JUST GIVE ME THE ANSWER
Calculate the heat in kJ required to change 10.0 g of water at 20.0°C into steam at 120.0°C. The specific heat of ice, water and steam is 2.108 J/g*°C, 4.18 J/g*°C, 2.010 J/g*°C respectively. Hf for H2O = 334 J/g, Hv for H2O = 2260 J/g.
Answer:
153.7kJ
Hope this helps :)
Four transmembrane regions changes conformation as gaba binds. which system is this process describing?
Ligand-gated ion channel is this process describing four transmembrane regions changes conformation as Gaba binds.
What are Gaba?In addition to being a ligand-gated ion channel, the [tex]GABA_A[/tex] receptor ( [tex]GABA_A[/tex] R) is an ionotropic receptor. Aminobutyric acid (GABA), the main inhibitory neurotransmitter in the central nervous system, is its endogenous ligand.
The postsynaptic cell's [tex]GABA_A[/tex] receptor opens up to chloride ions (Cl) and, to a lesser extent, bicarbonate ions (HCO3); this selective permeability is known as the [tex]GABA_A[/tex] receptor.
Depending on the membrane potential and the differential in ionic concentration, this may cause ionic fluxes across the pore. When the receptor is active, Cl will flow into the cell if the membrane potential is greater than the equilibrium potential, sometimes referred to as the reverse potential, for chloride ions.
Learn more about GABA
https://brainly.com/question/13149139
#SPJ4
If your heart beats at a rate of 72 times per minute and your lifetime will be 70 years, how many times will your heart beat during your lifetime?
Answer:
2,649,024,000
Explanation:
Multiply 72*60*24*365*70
Explain why one redwood tree has almost the same density as a whole forest of redwood trees.
The density of one redwood tree has almost the same density as a whole forest of redwood trees because density does not change with the shape, size, and mass of an object.
What is density?“Density is characterized as a mass of a unit volume of an object.”
d = m/v
Where m = mass and v = volume
It is expressed as gram per cubic centimeter.
Density is a property that does not depend upon the amount of substance present.
Thus, due to the fact that density is independent of an object's shape, size, and mass, one redwood tree has nearly the same density as an entire forest of them.
To learn more about density, refer to the link:
https://brainly.com/question/11921329
#SPJ1
PLS HURRY WILL MARK BRAINLIEST
What two terms describe how new cells are made?
Answer: Mitosis & meiosis
Explanation:
Answer:
I think it is cell division and mitosis
Explanation:
I hope this is right sorry if it isnt
The periodic table is arranged by various patterns. Is there a pattern with regard to ionic charge? In three to five sentences, explain your reasoning and provide specific examples
Yes, there is a pattern about the ionic charge because the left-side elements in the periodic table have cation ions whereas the right-side elements have anions.
What is the pattern of ionic charge in the periodic table?Ions are formed because of the addition of electrons or the removal of electrons from an atom or molecules or other ions. Across a period, a nuclear charge of an atom increases while the electron shielding remains constant. A higher effective nuclear charge leads to greater attraction of the electrons which results in a smaller atomic radius of an atom. On the right side of the periodic table, elements accept electrons and become negative ions i.e. anions whereas elements on the left side lose an electron and become positive ions i.e. cations.
So we can conclude that due to the losing of the electron the left side of elements in the periodic table has a cation ion whereas the right side of elements has an anion because of the addition of electrons.
Learn more about ionic here: https://brainly.com/question/2687188
#SPJ1
Metals participate in two types of single-displacement reactions. A reactive metal can displace _____ gas either from water or from an aqueous acid. A _____ reactive metal can also displace the ion of a _____ reactive metal from solution.
Answer:
c. H₂; more; less
Explanation:
Consider the reaction, h2 i2 => 2 hi , which is found to be half order in i2 and first order in h2. which step of the proposed mechanism must be slow in order to agree with this rate law?
3rd step of the proposed mechanism must be slow in order to agree with this rate law in the reaction, h2 i2 => 2 hi , which is found to be half order in i2 and first order in h2.
What is hydrogen?Having the atomic number 1 and the letter H, hydrogen is the first chemical element. The lightest substance is hydrogen. Hydrogen has the formula H2 and exists as a gas under normal conditions. It burns easily and is non-toxic, tasteless, colorless, odorless, and odorless.
With approximately 75% of all normal matter made up of hydrogen, it is the most prevalent chemical in the universe. The majority of hydrogen in plasma stars like the Sun is hydrogen. Water and organic compounds are two examples of molecules that contain the majority of the hydrogen that exists on Earth.
One proton, one electron, and no neutrons are present in each atom of the most prevalent isotope of hydrogen (symbol 1H).
Learn more about hydrogen
https://brainly.com/question/1426421
#SPJ4
Full question
Consider the reaction, H2 + I2 => 2 HI , which is found to be first order in I2 and first order in H2. Which step of the proposed mechanism must be slow in order to agree with this rate law?
I 2 => 2 I
I + H2 => H2I
H2I + I => 2 HI
1. 2
2. 3
3. 1
4. Either 2 or 3
At 35°C, how many grams of NaNO3 will dissolve
in 100 grams of water?
35 grams
20 grams
37 grams
100 grams
Solubility (g of salt in 100 g H₂O)
888288 2 8 2 2
100
50
30
20
NaNO
Cach
Pb(NO₂)2
NaCl
FOND
KCI
KCIO
toofy
Ce₂(SO)
0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
100g of NaNO3 will dissolve in 100 grams of water
A homogeneous mixture of solutions of one or more solutes in a solvent. Adding sugar cubes to your tea or coffee is an example of a common solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance (solute) to dissolve in a particular solvent. A solute is a substance that is either a solid, liquid, or gaseous solution in a solvent.
Here it is given that in 100g of water at temperature 35°C the amount of NaNO3 will dissolve is 100g we get it from the solubility curve
The graphical relationship between solubility and temperature is called the solubility curve. A solubility curve shows the change in solubility of a solid at different temperatures in a solvent. In the figure, temperature variation is plotted on the x-axis and solubility is plotted on the y-axis.
Learn more about solubility here https://brainly.ph/question/312003
#SPJ9
Distinguish between haploid and diploid
When an organism's cells only have one set of chromosomes, the organism is said to be haploid. All organisms that reproduce sexually are diploid (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.
The term "diploid" describes an organism's cells having two full sets of chromosomes, with one chromosome from each parent present in each pair. Since humans are diploid, the majority of their cells have 23 pairs of chromosomes.
Distinguish between haploid and diploid.
The number of chromosome sets found in the nucleus is the most obvious distinction between haploid and diploid cells. In contrast to diploid cells, which have two sets of chromosomes, haploid cells only have one set.The result of mitotic cell division is the formation of diploid cells. Following meiotic cell division, haploid cells are produced.Since there are two sets of chromosomes, there are two times as many chromosomes overall as there are in haploid cells. In comparison to diploid cells, there are half as many chromosomes because there is only one set present.To know more about haploid and diploid, click on the link below:
https://brainly.com/question/1351575
#SPJ9
The road is 6 kilometers long. How
long is the road in meters?
Answer: It is 6000 meters
Explanation:
You multiply the length value by 1000
Phosphorous exists in many different solid forms. Two common forms of phosphorous are red and white phosphorous. Which new vocabulary term describes the fact that phosphorous exists in two or more forms?
The term is Allotropy
Which means that an element can exist in two or more forms with the same physical state but different structures
to determine the freezing point depression of a licl solution, toni dissolved 0.393 g of licl in 20.3 ml of distilled water. determine the molal concentration (m) of the resulting solution. mwlicl
To determine the freezing point depression of a LiCl solution, toni dissolved 0.393 g of LiCl in 20.3 mL of distilled water. The molal concentration of the resulting solution is determined to be 0.453 m.
Molal concentration is the measure of the concentration number of moles of solute in 1 kg of solvent.
To calculate the molal concentration -
Calculate the mass of LiCl -
mass = density x volme
mass = 1 g/mL x 20.3 mL
mass = 20.3 g
mass = 0.0203 kg
Calculate the moles of LiCl:
Number of moles = Given mass
Molar mass
n = 0.393 g = 9.2 x 10⁻³ mol
42.394 g/mol
So, the molal concentration is,
M = 9.2 x 10⁻³ mol
0.0203 kg
M = 0.453 m
Therefore, the molal concentration of the resulting solution is 0.453 m.
To learn more about molal concentration:
brainly.com/question/14771268
#SPJ4
Methane, ch4, is the gas commonly found in labs to fuel bunsen burners. A) how many moles of methane are there in a 7. 21 gram sample?
Using the molar mass of methane, there are 0.45 mole of methane in a 7.21 gram sample.
Molar mass is defined as the mass per unit mole of a substance.
MM = m/n
where MM = molar mass
m = mass
n = number of moles
The molar mass of methane is the sum of the molar masses of each element.
C : 12.011
H : 1.00784
CH4 : 12.011 + 4(1.00784) = 16.04236 g/mol
If a sample of methane has a mass of 7.21 grams, using the formula for the molar mass, solve for the number of moles.
MM = m/n
16.04236 g/mol = 7.21 g/n
n = 7.21 g/16.04236 g/mol
n = 0.4494351205 mol
n = 0.45 mol
Learn more about molar mass here: https://brainly.com/question/15476873
#SPJ4
photon has the frequency of 2.00 x 10^19 Hz, what is the energy and wavelength of this photon.
The energy and the wavelength of the photon would be 1.3252 ×10⁻¹⁴ Joules and 150 nanometers respectively.
What is the frequency?It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.
C=λν
λ = c / ν
Wavelength = 3×10⁸ / 2.00 x 10¹⁹
=1.5 x 10⁻¹¹
=150 nanometers
By using the Planck's energy formula,
E = hν
Where h is the Planck's constant with a value of 6.626×10⁻³⁴.
The energy of the Photon = 6.626×10⁻³⁴ ₓ 2.00x 10¹⁹
The energy of the Photon = 6.626×10⁻³⁴ ₓ 2.00 x 10¹⁹
=1.3252 ×10⁻¹⁴ Joules
Thus, the energy and the wavelength of the photon would be 1.3252 ×10⁻¹⁴ Joules and 150 nanometers respectively.
Learn more about frequency here, refer to the link;
brainly.com/question/14316711
#SPJ1
SOMEONE PLEASE ANSWER MY QUESTION.
12.
(01.04 MC)
What is the most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks? (5 points)
1. Reddish glow is emitted as kinetic energy is transformed into thermal energy
2. Reddish glow is emitted as kinetic energy is transformed into electrical energy
3. Broken end of the wire turns hot as kinetic energy is transformed into thermal energy
4. Broken end of the wire turns hot as kinetic energy is transformed into electrical energy
The most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks is as follows:
The broken end of the wire turns hot as kinetic energy is transformed into thermal energy.Thus, the correct option for this question is C.
What is Energy transformation?Energy transformation may be defined as the process that significantly involves the conversion of one form of energy into another or the migration of energy from one place to another.
According to the context of this question, the wire is an electrical appliance that might be heated due to excessive usage. Due to this, the energy of motion which is known as kinetic energy gets transformed into thermal energy when its ends are broken.
Therefore, the correct option for this question is C.
To learn more about Energy transformation, refer to the link:
https://brainly.com/question/2667612
#SPJ1
As the Cassini-Huygens spacecraft headed toward Saturn, it reached speeds of 5.2 kilometers per second. How many meters per minute did it travel at this speed?
The speed in number of meters per minute the spacecraft travel at the speed of 5.2 km per second is 3,12,000 meters per minute.
The speed is 5.2 km per second
We know that 1 kilometer per second is equal to 60000 meter per minute
So converting, we get 5.2×60000= 3,12,000 meters per minute
Conversion of units is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors which change the measured quantity value without changing its effects.There is a multiplication factor introduced for the conversion of units through which it is converted.To learn more about unit conversion visit:
https://brainly.com/question/11543684
#SPJ1
calculate amount of tin and mass percentage
Amount of tin in the sample is 2.2837 gm and its mass percentage in the rock is 22.837%
I₃⁻ (aq) + Sn⁺² (aq) → Sn⁺⁴ (aq) + 3I⁻
1 mol 1 mol
mol of NaI₃ = 34.60 mL × 1 L / 1000 mL × 0.5560 mol / L
= 19.2376 × 10⁻³ mol
∵ 1 mol of Sn²⁺ = 1 mol of I₃⁻
∴ mol of Sn²⁺ = 19.2376 × 10⁻³
∴ mass of Sn in sample = mol of Sn²⁺ × molar mass
= ( 19.2376 × 10⁻³ mol ) × 118.71 gm/mol
= 2.28369 gm
= 2.2837 gm
∴ % of tin in sample = (mass of tin) / (mass of sample ) × 100
The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution
= 2.2837/10 × 100
= 22.837 %
Thus we can conclude that amount of tin in the sample is 2.2837 gm and its mass percentage in the rock is 22.837%
Learn more about mass percentage at https://brainly.com/question/5493941
#SPJ1
Tough Tusion. 6. Consider the fission of uranium-235.
a. The fission of uranium-235 begins with the addition of a neutron to the nucleus. What isotope is formed? Give the isotope symbol.
b. After the neutron is added, the uranium atom is more unstable and undergoes fission. A possible set of products is krypton-94, barium-139, and 3 neutrons. How many protons are in these products?
c. Were any protons lost?
Uranium -236 (U-236) and the protons that are contained in the products are; krypton-36 and barium-56.
What is a fission reaction?The term fission refers to the process in which the nucleus of a larger element is bombarded with a small particle such as a neutron which causes the nucleus to become split. As the nucleus is split, smaller nuclei are able to be formed and this leads to the release of a tremendous amount of energy.
It should be known that fission reaction is one of the ways in which energy is released on a massive scale. While, it s true that fission reactions could be deployed on the negative scale such as in the production of the fission bombs, we should also know that it could be used positively to generate electricity in nuclear power plants.
The equation of the fission of uranium-235 begins with the addition of a neutron to the nucleus. What is then formed is uranium -236 (U-236). The protons that are contained in the products are; krypton-36 and barium-56.
Learn more about fission reaction:https://brainly.com/question/6572079
#SPJ1
a naturally occurring sample of an element contains only two isotopes. the first isotope has a mass of 120.9038 amu and a natural abundance of 57.4%. the second isotope has a mass of 122.9042 amu. find the atomic mass of the element.
Every existing particle or an element has a certain amount of matter. Everything is made of atoms. The matter content of an atomic particle is called the atomic mass.
Atomic mass of two isotopes is given as:
X1 = 120.9038 amu with a natural abundance of 57.4%.
X2 = 122.9042 amu
Natural abundance for the X2 element would be 100 - 57.4% = 42.6%
Individual contribution made by both the elements would be product of their atomic masses and their natural abundance.
For X1
= 120.9038 * 57.4%.
= 120.9038 * 0.574
= 69.4 u
For X2
= 122.9042 * 42.6%
= 122.9042 * 0.426
= 52.8 u
Total mass = 69.4 u + 52.8 u = 121.8 u
Answer: The atomic mass of the element is 121.8 u.
To know more about atomic mass,
https://brainly.com/question/11026782
#SPJ4