Answer: d. both (b) and (c)
Explanation:
Atoms are too small to be seen on microscopes, so we model them based on theories.
Which of the following observations would indicate that a material is a pure substance?
O It does not dissolve in water.
O It changes color after heating.
O It cannot be physically broken down into different types of atoms.
O It can be physically broken down into different types of molecules.
Answer:
C
Explanation:
Got it right on a test
the ability to roll your tongue allele T is dominant to the allele t inability to roll your tongue. if mother is a homozygous tongue roller TT and father tt can't roll his tongue. what possible offspring will they have?
Answer:
homozygote
Explanation:
Because tongue-rolling is recessive, the only way a person would be unable to roll his/her tongue would be if s/he were homozygous mutant.
How many grams of NaCl can be created from 9.8 moles of HCl? (molar mass of NaCl= 58.44g, HCl=36.46g)
The mass of NaCl that can be produced from 9.8 moles of HCl is 572.712 g
Balanced equation2Na + 2HCl --> 2NaCl + H₂
From the balanced equation above,
2 moles of HCl reacted to produced 2 moles of NaCl.
Therefore,
9.8 moles of HCl will also react to produce 9.8 moles of NaCl
How to determine the mass of NaClMolar mass of NaCl = 58.44 g/molMole of NaCl = 9.8 molesMass of NaCl =?Mass = mole × molar mass
Mass of NaCl = 9.8 × 58.44
Mass of NaCl = 572.712 g
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Does this equation show that transmutation has taken place during decay? why or why not?
61/28 ni=61/28 ni + y
a. yes, because the numbers of nucleons and atoms are conserved
b. no, because high-energy electromagnetic waves are emitted
c. no, because there is conservation of the number of atoms as well as the number of nucleons
d. yes, because nickel atoms remain nickel atoms with the same number of neutrons
The equation is not a transmutation because there is conservation of the number of atoms as well as the number of nucleons; option C.
What is transmutation?Transmutation refers to the artificial synthesis of new elements by a nuclear reaction of the original element and nuclear particles.
In transmutation, a new element is formed and the atomic number changes.
Based on the above, it can be concluded that the given equation is not a transmutation because there is no change in atomic and nucleon number.
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In the nebular hypothesis, why did the nebula start to collapse?
Answer:
Because of gravity and as a result, created planets and stars.
(Likely by a nearby supernova shockwave also)
What is a step by step explanation of the nebular hypothesis?Although I'm not an expert, I seem to recall reading that solar systems often begin with clouds of unorganized matter measuring 20 parsecs (65 light years) across. Most of them are hydrogen molecules. The pressure required to hold the molecules together increases with temperature, but because the typical temperature is around 12 k, the pressure is negligible. It originates from the gravity of the cloud itself. Material from novas, colliding neutron stars, and high-speed material jets emerging from stars and black holes all contribute to the continuous enrichment of such clouds. That adds those heavy elements—like gold—that can only be produced by the rapid neutron capture (rNC) process as opposed to the simple nuclear fusion process (slow neutron capture). These clouds spontaneously emerge from floating pieces of material, hold together for millions of years, and eventually disperse. A component of the cloud condenses along the route for a variety of causes, including localized concentrations of greater density or shock waves from supernovae. Unbalances in the cloud lead it to split up when condensation takes place. Then those fragments shatter once again, leaving you with barely enough for a solar system. It would have been within 3.5 light years of the initial cloud for our galaxy. The contraction up to this point has been isothermal, which means that heat is being radiated so quickly that temperature stays mostly unchanged. The creation of a Bonnor-Ebert sphere comes next. Although such zones frequently appear in photographs in a faint manner, this is only a hypothetical area in which there is a certain amount of mass. The First Hydrostatic Core is located here (FHSC or First Core). The First Core can be imagined as a pre-proto Sun with an interior temperature of roughly 300 k and a radius of 1 AU (the same as the Earth's orbit) (26.85 C or 80.33 F). Although it first begins off chilly, it ultimately warms up to 300 k and then grows even hotter over the course of years. The friction of falling materials and adiabatic contraction provide the heat (the kind that makes things hotter). Hydrogen molecules start to break down into atomic hydrogen, which is more dense and falls to the center, at temperatures between 1500 k and 2000 k, on average. Eventually, the atomic hydrogen coalesces into a protostar-sized Second Core. Because the entire system is rotating swiftly and because momentum is being lost in some areas owing to gas shooting off, an accretion disk has already formed. Although in our instance it would have also been a protoplanetary disk, the disk is a protostellar disk. The protostar is regarded as a star until it becomes hot and brilliant enough to begin ejecting the gas and dust. (Prior to it, infalling gas and dust are still adding mass to the protostar.)
In the nebular hypothesis, the collapse of the nebula is believed to have been triggered by a disturbance or shock wave, such as a nearby supernova explosion or the gravitational influence of a passing star or gas cloud.
This disturbance caused the nebula, which was a large and diffuse cloud of gas and dust in space, to start collapsing under the force of its own gravity. As the nebula contracted, its particles came closer together, and the conservation of angular momentum caused it to spin faster.
The collapse and spin eventually led to the formation of a rotating protostellar disk at the center, which eventually evolved into a young star, while the surrounding material formed planets and other celestial bodies through accretion and gravitational attraction.
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Write the formula and calculate the molecular mass of
1) Soda ash
2) Baking Soda
3) Lime Stone
4) Ethanol
5) Common Salt
The molecular formula is the sum of the atomic masses of all atoms in the molecule.
The formula of Soda Ash:
Na₂CO₃ is also known as Sodium Carbonate.
The molecular mass of Soda Ash is
(2×Na)+(1×C)+(3×O)=106g/mol
The formula of Baking Soda:
NaHCO₃ is also known as Sodium bicarbonate.
The molecular mass of Baking Soda is
(1×Na)+(1×H)+(1×C)+(3×O)=84g/mol
The formula of Lime Stone:
CaCO₃ is also known as Calcium carbonate.
The molecular mass of Lime Stone:
(1×Ca)+(1×H)+(1×C)+(3×O)=100g/mol
The formula of Ethanol:
C₂H₅OH is the formula of ethanol.
The molecular mass of Ethanol:
(2×C)+(6×H)+(1×O)=46g/mol
The formula of Common Salt:
NaCl is also known as Sodium chloride.
The molecular mass of Common Salt:
(1×Na)+(1×Cl)=58.5g/mol
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What is the source of energy in nuclear power plants?
Answer:
URANIUMExplanation:
What is the source of energy in nuclear power plants?
Uranium is the fuel most widely used by nuclear plants for nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart.
Choose the correct statements when comparing 1 mole of carbon
monoxide and one mole of helium gas.
a: they weigh the same
b: they have the same amount of particles
c: they occupy the same volume
Answer: they have the same amount of particles
Explanation:
This statement is true by Avogadro's Law, which states that in a mole of any substance, there are [tex]6.022 \times 10^{23}[/tex] particles.
How many grams of aluminum
chloride, AlCl3, form when 0.25 mol
Al react?
2AI+ 3Cl₂ → 2AICI 3
[?] g AICI 3
From the equation, we know that for every 2 moles of aluminum consumed, 2 moles of aluminum chloride are produced.
This means that if 0.25 moles of Al react, then 0.25 moles of aluminum chloride are produced.
The atomic mass of Al is 26.9815385 g/mol.The atomic mass of Cl is 35.45 g/mol.So, the formula mass of aluminum chloride is:
26.9815385+3(35.45)=133.3315385 g/mol.Thus, 0.25 moles have a mass of:
(133.3315385)(0.25), which is about 33 g (to 2 sf)How are a mole and a dozen similar?
Mole and dozen are similar to each other because of the presence of number 12 in both measurements.
How are a mole and a dozen similar?The sample of 12 grams of carbon is equal to its one mole and we know that in one dozen, there are 12 numbers. Therefore, we considered mole similar to a dozen.
So we can conclude that Mole and dozen are similar to each other because of the presence of number 12 in both measurements.
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Perform the following operation
and express the answer in
scientific notation.
2.36×10-2 8.4×10²
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \tt \rightarrow \:2.8 × {10}^{-5}[/tex]
____________________________________
[tex] \large \tt Solution \: : [/tex]
[tex]\qquad \tt \rightarrow \: \dfrac{2.36 \times 10 {}^{ - 2} }{8.4 \times {10}^{2} } [/tex]
[tex]\qquad \tt \rightarrow \: \dfrac{2.36 }{8.4 } \times \cfrac{10 {}^{ - 2} }{10 {}^{2} } [/tex]
[tex]\qquad \tt \rightarrow \: 0.28 \times 10 {}^{ - 2 - 2} [/tex]
[tex]\qquad \tt \rightarrow \: 0.28 \times 10 {}^{ - 4} [/tex]
[tex]\qquad \tt \rightarrow \: 2.8 \times 10 {}^{ - 5} [/tex]
Answered by : ❝ AǫᴜᴀWɪᴢ ❞
What is the molar concentration of
a solution with a volume of 1.5 L
containing 660 g Ca3(PO4)2?
Answer:
1.42 M
Explanation:
First calculate the amount of moles.
that's done by dividing the mass with the molecular mass so 660g / 310.18 g/mol = 2.13 mol
Then you can calculate the molarity by dividing the moles with the volume so 2.13 mol / 1.5 l = 1.42 M
(without rounding: 1.418531175 M)
Answer:
1.42 M
Explanation:
Acellus
PLS HELP ME ASAP ILL GIVE BRAINLIEST
Which statement best describes how a Geiger counter works?
Select one:
a. Water vapor condenses along a path traveled by ionizing radiation.
b. Particles ionized by radiation cause black streaks to appear on sensitive photographic paper.
c. Radioactive particles ionize argon gas in a tube and the resulting electric current is amplified and heard as a clicking sound.
d. A material sensitive to radioactive emissions glows when mixed with a radioactive substance.
Answer:
the answer is c
Explanation:
c. Radioactive particles ionize argon gas in a tube and the resulting electric current is amplified and heard as a clicking sound.
What is the electron configuration for helium (He)?
O 1s¹
O 1s²
O 1s²2s¹
O 1s²2s²
If 1.32 g MgO is combined with 100.0 mL of 1.00 M HCl in a coffee cup calorimeter, the temperature of the HCl solution increases from 24.2 °C to 34.4 °C. Calculate the enthalpy change for the reaction per mole of MgO. Assume that the specific heat of the HCl solution is 4.18 J/g·°C and its density is 1.00 g/mL.
MgO(s) + 2HCl (aq) MgCl2 (aq) + H2O (l)
The change in enthalpy for the reaction per mole is -130KJ/mol.
Given,
Reaction: MgO(s) + 2HCl (aq) →MgCl₂ (aq) + H₂O (l)
1.32 g MgO is combined with 100.0 mL of 1.00 M HCl in the cup of coffee.
Change in temperature, ΔT=34.4 °C-24.2 °C =10.2°C
Specific heat of the HCl solution, c= 4.18 J/g·°C
Density= 1.00 g/mL
Mass can be written as the product of density and volume.
Mass= Density × Volume= 1g/ml × 100 ml=100g
Heat can be written as
Heat, Q=mcΔT=100g×4.18 J/g·°C×10.2°C=4263.6J
Number of moles of the MgO,
n= (mass of MgO)/(Molar mass)= 1.32g/(40.3g/mol)= 0.03275 mol
Change in Enthalpy, ΔH=-Q/(n)=(-4263.6J)/(0.03275 mol)
ΔH= -1300186J/mol= -130KJ/mol
Hence, the change in enthalpy for the reaction per mole is -130KJ/mol.
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A balloon sits in the sunlight causing it to heat up and explode. Which of the following
explains what happened the best:
a. the particles of gas inside the balloon moved faster and decreased pressure in
the balloon, causing it to explode
b. the particles of gas inside the balloon moved faster and increased pressure in
the balloon, causing it to explode
c. the particles of gas outside the balloon moved faster and decreased pressure
on the balloon, causing it to explode
d. the particles of gas outside the balloon became more excited moved faster and
increased pressure on the balloon, causing it to explode
9- Which pair of formulae represents two alkanes? (1 mark)
A)CH4 and C8H18
B)C₂H6 and C5H8
C) C3H6 and C5H12
D) C₁0H8 and C4H8
Answer:
A) CH4 and C8H18
Explanation:
General Formula for an Alkane = CnH2n+2This means for every number of Carbon (C) atoms, there are twice as many Hydrogen (H) atoms with an additional two added onto that.Therefore, if there is one Carbon Atom, and we multiply that by two, and then add an additional two, we get 4 Hydrogen atoms, so CH4, which is our first FormulaeSecondly, if we have eight Carbon Atoms, and we multiple that by two (16), and then add an additional two, we get 18 Hydrogen atoms, so C8H18, which is our second FormulaeThe other Formulas do not follow this 'General Formula'Which quantity is held constant for Boyle's law, Gay-Lussac's law, and Charles's law?
volume
mass
temperature
pressure
Boyle's law: in Boyle's law, pressure of a gas in inversely proportional to the volume while the temperature is shield constant
TemperatureGay-Lussac's law: In Gay-Lussac's law, pressure of a gas in directly proportional to the temperature while the volume is held constant.
VolumeCharles's law: In Charles's law, the volume of a gas is directly proportional to the temperature while the pressure is held constant.
PressureWhat is the common uses of bases
How to convert °c 40 to °f
Answer:
104 f
Explanation:
multiply 40 by 1.8 and then add 32
A 609 ml sample of naoh has a ph of 13.5292. if 594 ml of distilled water was added to the initial naoh solution, what would the new ph of the solution be g
The new pH of the solution after the addition of water would be 13.22.
Total volume of the solutionV(total) = 609 ml + 594 ml
V(total) = 1203 ml
Concentration of waterC = (594 ml)/(1203 ml)
C = 0.493
pOH = -log(0.493)
pOH = 0.31
New pH of the solution = 13.5292 - 0.31 = 13.22
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How much energy is required to heat 36. 0 g h2o from a liquid at 65°c to a gas at 115°c? the following physical data may be useful.
The required energy will be "87752 J".
What is energy?The definition of energy is "ability to do work," which is the capacity to apply a force that causes an item to move.
Mechanical, heat, chemical, electrical, radiant, nuclear, and sound are the seven types of energy.
The energy will be:
Q1 = 36 × 3.18(100-65)
Q1 = 5267 J
Moles of water = [tex]\frac{36.0}{18}[/tex]
Moles of water = 2
then,
Q2 = 2× 40.7
Q2 = 81.4 KJ
Q2 = 81400 J
Q3 = 36.0 × 2.01(115-100)
Q3 = 1085 J
hence,
Required energy will be= Q1+ Q2+ Q3
Required energy = 5267 + 81400 + 1085
Required energy = 87752 J
hence, 87752 J energy is required to heat 36. 0 g h2o from a liquid at 65°c to gas at 115°c.
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Question 3
Not yet
answered
Points out of
If you dissolve 2.70 g of NaCl in 425 mL of water, what is the molarity of the
solution? (Report your answer to three places past the decimal point. Moodle is
looking for a number only, no units.)
I added a screenshot because I recently answered the same question. I hope this helps you!! :)
Based on the electron configuration of the two
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Magnesium 1s²2s²2p63s²
Sulfur 1s²2s²2p63s²3p4
A compound formed between Magnesium and Sulfur is MgS.
What is a cation?Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons).
Magnesium, Mg, is located in period 3, group 2 of the periodic table, and has two electrons on its outermost shell.
On the other hand, sulfur, S, is located in period 3, group 16 of the periodic table, and has six electrons on its outermost shell.
Chemical reactivity is governed by an atom's "desire" to have a stable electron configuration and to have eight electrons in its outermost shell to complete an octet.
In this case, magnesium can complete its octet by giving up those two valence electrons, becoming the magnesium cation.
[tex]Mg^{2+}[/tex], in the process.
Sulfur, which only needs two electrons to complete its octet, will pick up the two electrons coming from magnesium, becoming the sulfide anion,
[tex]S^{2−}[/tex], in the process.
The electrostatic force of attraction will then bring the magnesium cations and the sulfur anions together to form an ionic bond.
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Balance the equation in the space below for the reaction of ammonia and oxygen, using the smallest whole number coefficients
NH₂(g) + O₂(g) → N₂(g) + H₂O(g) + energy
The balanced equation of the reaction is:
2 NH₂(g) + O₂(g) → N₂(g) + 2 H₂O(g) + energy What is a balanced equation of a reaction?A balanced equation is an equation of a reaction in which the moles of atoms of elements in the reaction are equal on both sides of the equation.
The given equation can be balanced as follows:
2 NH₂(g) + O₂(g) → N₂(g) + 2 H₂O(g) + energy
Therefore, the balanced equation of the reaction is the one in which the moles atoms of reacting elements are equal.
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When molten magma rises to the surface it cools ________, forming ________ igneous rocks.
A. slowly, extrusive
B. slowly, intrusive
C. rapidly, intrusive
D. rapidly, extrusive
Answer:
B)Slowly, intrusive
a burning candle wax reacts with oxygen. after a glass jar is placed over it, the candle goes out. what is the limiting reactant?
Answer:
The Oxygen
Explanation:
When fire is covered, it goes out due to the lack of oxygen to maintain itself.
The limiting reactant in the experiment of the burning candle is oxygen.
What is a limiting reactant?A limiting reactant is a reactant which determines the amount of product that ca be formed in a given reaction.
The limiting reactant is always used up in a reaction, after which the reaction stops.
In the experiment of the burning candle, covering the candle with the glass prevents more oxygen from taking part in the reaction.
Therefore, the limiting reactant is oxygen.
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What is the empirical formula for the molecular formula given? Molecular formula: C5H12O
What is the empirical formula for the molecular formula given? Molecular formula: C5H12O
The empirical formula for the given molecular formula C₅H₁₂O. As the molecular formula cannot be reduced into simplest ratio, therefore, the empirical formula and the molecular formula are the same.
What is the empirical formula?The empirical formula can be described as the simplest ratio of the number of different atoms present in a compound. The molecular formula of the compound can be described as the actual number of each different atom in a molecule. This formula is generally used and is also a multiple of the empirical formula of a compound.
The empirical formula provides the ratio of the number of atoms of a chemical in a given compound. The percentage composition directly gives the empirical formula of the compound.
The molecular formula can be reduced into the empirical formula of the compound by dividing the subscripts with a number that can provide the smallest ratio of the elements in the compound.
For the given molecular formula, the further simplest or most reduced ratio cannot be possible. Therefore, the empirical formula of the compound will be the same as the molecular formula. Therefore empirical formula of the compound is C₅H₁₂O.
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Which formula represents the compound commonly known as phosphine with iupac name phosphorus trihydride? ph ph2 ph3 ph4
C. PH3 represents a compound commonly known as phosphine, whose IUPAC name is phosphorus trihydride.
What type of bond is PH3?The electronegativity of PH3 found in the Periodic Table of the Period attracts covalent electron pairs and creates covalent bonds. However, because the electrons are not bound, asymmetrical rate distribution occurs. Therefore, PH3 is a polar molecule with a non-polar covalent bond and currently has no polar bond.
What defines a covalent bond?A covalent bond consists of sharing one or more electron pairs between two atoms. These electrons are attracted to two nuclei at the same time. Covalent bonds are formed when the difference in electronegativity between two atoms is too small for electron transfer to form ions.
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Answer:
C.) ph3
Explanation:
The work of which scientist was most essential to the use of radioactive isotopes in medicine
The work of John Lawrence scientist was most essential to the use of radioactive isotopes in medicine.
Which scientist use of radioactive isotopes in medicine?John Lawrence was the first scientist that use a radioactive isotope in the treatment of a human disease. He became known as the father of nuclear medicine and his laboratory is considered the birthplace of this field.
So we can conclude that the work of John Lawrence scientist was most essential to the use of radioactive isotopes in medicine.
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