Answer:
Ca3Sb2Antimony--calcium (2/3) | Ca3Sb2 - PubChem.Explanation:
I hope it's help
10 points!! Please answer only if you know the correct answer I’m already failing the class :/
How many moles are represented by 9.34 x 1021 sodium atoms?
a . 1.25 x 10^-2 moles
b. 1.55 x 10^-3 moles
c. 1.55 x 10^-2 moles
d. 1.55 moles
Answer:
c) 1.55 ×10⁻² moles
Explanation:
Given data:
Number of moles of sodium = ?
Number of atoms = 9.34 ×10²¹ atoms
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Moles of sodium atoms:
1 mole contain 6.022× 10²³ atoms
9.34 ×10²¹ atoms × 1 mol / 6.022× 10²³ atoms
1.55 ×10⁻² moles
pls help will give brainiest
Answer:
The answer is B
Explanation:
The moon is in-between the sun and the Earth during a new moon.
1. In detail and in your own words, describe the motion of each of the following objects in the solar system. Remember to write in complete sentences. Draw a sketch that shows how each object moves around the sun. You may draw your sketches by hand or you may use the Paint program on your computer. (15 points each)
a. The planets (include 2 ways planets move)
b. Moons (include 2 ways moons move)
c. Comets (What is the shape of their orbit? Around what object do they orbit?)
d. Asteroids (Where do they orbit? Around what object do they orbit?)
2. In your own words, explain each of the following measures. Include estimations that compare these units of measurement to distances you are more familiar with, such as miles or kilometers. (You do not need to include a measurement for light year. Just make sure you explain in detail what a light year is.) (15 points each)
a. Astronomical Unit (AU) (Include a specific number and a unit.)
b. Light Year
c. Speed of Light (Include a specific number and unit.)
3. List the planets in our solar system in order from closest to the sun to furthest away from the sun. Make sure you have this information memorized. (15 points)
4. In your own words, name and describe the force that keeps the planets orbiting around the sun, moons orbiting around planets, etc. What TWO factors affect the strength of this force? (15 points)
5. How does distance from the sun affect a planet's orbit period? How does distance from the sun affect a planet's orbit velocity? (10 points)
6. Planets A and B are orbiting around the sun. Planet A has a longer orbit period than planet B. Which planet is closer to the sun? (10 points)
7. Planets C and D are orbiting around the sun. Planet C has a slower orbit velocity than planet D. Which planet is closer to the sun? (10 points)
WORTH 100 POINTS
A compound is made up of 80.0 % C and 20.0 % H. Its molar mass is 30.0 g. What is its molecular formula?
a. C2H6
b. CH
c. C4H12
d. CH3
Answer:
Molecular formula = C₂H₆
Explanation:
Given data:
Percentage of hydrogen = 20.0 %
Percentage of carbon = 80.0 %
Molar mass = 30.0 g
Empirical formula = ?
Solution:
Number of gram atoms of H = 20 / 1.01 = 19.8
Number of gram atoms of C = 80 /12 = 6.7
Atomic ratio:
C : H
6.7/6.7 : 19.8/6.7
1 : 3
C : H = 1 : 3
Empirical formula is CH₃.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula = CH₃ = 12×1 +3×1.01 = 15.03 g/mol
n = 30 g/mol / 15.03 g/mol
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (CH₃)
Molecular formula = C₂H₆
Calculate the percentage of yield when 20 grams of sodium chloride solution reacts with an excess amount of silver nitrate solution knowing that 45 grams of silver chloride precipitated
%yield = 91.8
Further explanationGiven
20 g NaCl
45 g AgCl
Required
%yield
Solution
Reaction
NaCl + AgNO₃ ⇒ AgCl + NaNO₃
mol NaCl :
= mass : MW
= 20 g : 58,44 g/mol
= 0.342
mol AgCl from equation :
= 1/1 x mol NaCl
= 1/1 x 0.342
= 0.342
Mass AgCl(theoretical) :
= mol x MW
= 0.342 x 143,32 g/mol
= 49.02 g
%yield = (actual/theoretical) x 100%
%yield = (45/49.02) x 100%
%yield = 91.8
Percentage % yield = 91.8%
Given:
20 g NaCl
45 g AgCl
To find:
% yield=?
The balanced chemical equation will be:
NaCl + AgNO₃ ⇒ AgCl + NaNO₃
First, we need to calculate moles of NaCl.
[tex]\text{Number of Moles}=\frac{\text{Given Mass}}{\text{Molar Mass}} \\\\\text{Number of Moles}=\frac{20}{58.44} \\\\\text{Number of Moles}= 0.342 moles[/tex]
Then, calculate moles of AgCl from equation:
[tex]\text{mol of AgCl}= 1/1 * \text{ mol NaCl}\\\\\text{mol of AgCl}= 1/1 * 0.342\\\\\text{mol of AgCl}= 0.342[/tex]
Mass AgCl(theoretical) :
[tex]\text{Mass of AgCl}= mol * MW\\\\\text{Mass of AgCl}= 0.342 x 143,32 g/mol\\\\\text{Mass of AgCl}= 49.02 g[/tex]
Now, calculate for percentage yield.
[tex]\%yield =\frac{actual}{theoretical} * 100\%\\\\\%yield = (45/49.02) * 100\%\\\\\%yield = 91.8\%[/tex]
The percentage yield will be 91.8%.
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PLZ help me !! ASAP!!!
Answer:
3.2g of NaOH
Explanation:
NaOH
Na = 22.989
0 = 16
H = 1
=39.989
40cm³ - 0.04dm
80g × 0.04dm = 3.2g of NaOH
hope this is correct!
Please help fast. I will give brainliest!!!
Answer:
Reaction #4
Explanation:
Generally, combustion reactions produce water and carbon dioxide, and the fourth answer choice is the only one that produces both of these compounds. Therefore, the fourth answer choice is the only one that can be a combustion reaction.
A student makes a Venn diagram as a study aid to compare asexual reproduction and sexual reproduction.
Which process belongs in the region marked X?
Fertilization
Vegetative propagation
Binary fission
Sporulation
What are the main differences between asexual reproduction and sexual reproduction?
Asexual reproduction requires two parents and produces non-identical offspring, while sexual reproduction requires only one parent and produces identical offspring.
Asexual reproduction requires two parents and produces identical offspring, while sexual reproduction requires only one parent and produces non-identical offspring.
Asexual reproduction requires only one parent and produces identical offspring, while sexual reproduction requires two parents and produces non-identical offspring.
Asexual reproduction requires only one parent and produces non-identical offspring, while sexual reproduction requires two parents and produces identical offspring.
Two scientists are debating how to classify a new animal species that they have discovered. They observe that the animal is capable of producing sperm.
What statement would they most likely make about the new species?
This animal produces offspring that are genetically different from itself.
This animal produces offspring that are genetically identical to itself.
This animal’s sperm will join with spores to produce offspring.
This animal’s sperm will undergo binary fission to produce offspring.
Koala bears reproduce sexually. Which statement describes how a young koala’s DNA compares to the DNA of its parents?
It has the same DNA as both parents.
All of its DNA comes from its father.
All of its DNA comes from its mother.
Half of its DNA comes from each parent.
Ryder needs to determine the missing term in this set:
sperm, egg, zygote, ________
Which term best completes the set?
binary fission
vegetative propagation
sporulation
fertilization
A scientist is studying two types of worms. Worm X has DNA identical to its parent. Worm Y has a combination of DNA from two parents. The scientist determines that one of the worms has a survival advantage over the other worm.
Which statement correctly summarizes this conclusion?
Worm X reproduces asexually, which gives it genetic variation.
Worm Y reproduces sexually, which gives it genetic variation.
Worm Y reproduces asexually, which gives it more DNA.
Worm X reproduces sexually, which gives it more DNA.
Answer:
gg
Explanation:
Why does Gaseous planets have the most moons
Answer:
In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields.
Explanation:
Answer:In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields. *Moons of planets and dwarf planets.
Explanation: .
Which statements would be expected to be true for Organesson? Select all that apply.
Answer:It has the lowest effective nuclear charge of the four new elements.
The electronic configuration of the Organesson element is [Rn]5f¹⁴6d¹⁰7s²7p⁶ so it has fully filled valence shell. As the last element in the periodic table, it has the largest atomic radius and the lowest effective nuclear charge. Therefore, option (C), (D), and (E) is correct.
What is an electronic configuration?The electron configuration gives information on how electrons are distributed in different energy levels of an atom of an element. In the electron configuration of an element, the number of electrons can be written as a superscript of electron-containing atomic subshells. For example, the electron configuration of magnesium is written as 1s²2s²2p⁶3s².
The principal quantum number (n) in electron configuration decides the maximum number of electrons that can fill in an electron shell. It is calculated from the formula 2n², where ‘n’ is the principal quantum number of the shell.
The atomic orbitals at lower energy must be fully filled before occupying an orbital at higher energy.
The atomic number of the Organesson element is 118 and the electronic configuration is [Rn]5f¹⁴6d¹⁰7s²7p⁶. Therefore, the valence shell of Organesson is fully filled. As the last element in the periodic table, it has the largest atomic radius and the lowest effective nuclear charge.
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Your question is incomplete, but most probably the complete question was,
Which statements would be expected to be true for Organesson (Og)? Select all that apply.
A. It is relatively unreactive.
B. It has a high electron affinity.
C. It has a full valence shell of electrons.
D. It has the largest atomic radius of the four new elements.
E. It has the lowest effective nuclear charge of the four new elements.
How many grams of H2O will be lost as steam if you heat 12.21g of CuSO4 · 4H2O? What is the chemical name of CuSO4 · 4H2O?
Answer:
3.798g of H₂O
Explanation:
In 1 mole of CuSO₄.4H₂O there are 4 molecules of water. The heat produce the releasing of 4 waters of hydration. To solve this question we need to convert the mass of CuSO₄.4H₂O to moles using its molecular mass (231.67g/mol). The moles of CuSO₄.4H₂O times 4 are the moles of water:
Moles CuSO₄.4H₂O:
12.21g CuSO₄ * (1mol / 231.67g) = 0.0527 moles
Moles H₂O:
0.0527 moles * 4 = 0.2108 moles of water
Mass (Molar mass H₂O = 18.015g/mol):
0.2108 mol * (18.015g / mol) =
3.798g of H₂OWhat is the chemical equation for solutions 1, 2, and 3. What is the Net ionic equations for each solution.
Answer:
The molecular equation shows each of the substances in the reaction as compounds with physical states written next to the chemical formulas. The
complete ionic equation shows each of the aqueous compounds as separate ions. Insoluble substances are not separated and these have the symbol (s) written
next to them. Water is also not separated and it has a (l) written next to it. Notice that there are ions that are present on both sides of the reaction arrow –>
that is, they do not react. These ions are known as spectator ions and they are eliminated from complete ionic equation by crossing them out. The remaining
equation is known as the net ionic equation. For example: The reaction of potassium chloride and lead II nitrate
Molecular Equation: 2KCl (aq) + Pb(NO3)2 (aq) -> 2KNO3 (aq) + PbCl2 (s)
Complete Ionic Equation: 2K+ (aq) + 2Cl-
(aq) + Pb2+ (aq) + 2NO3–
(aq) -> 2K+
(aq) + 2NO3
–
(aq) + PbCl2 (s)
Net Ionic Equation: 2Cl-
(aq) + Pb2+ (aq) -> PbCl2 (s)
Explanation:
Hope it help yoou mark as BrainlistWhich of the following compounds contains both ionic and covalent bonds?
A.NaCl
B.CO
C.KI
D.NaOH
Answer:
D.NaOH
Explanation:
The compound that contains both ionic and covalent bonds from the given choices is NaOH, sodium hydroxide.
An ionic bond is formed between a metal and non-metal. In this compound, the metal is the Na and non - metal is the OH. To form this bond type, an atom transfers its electrons to the non-metal to attain stability.
The radical group OH⁻ which acts as a single unit is made up of a covalent bond. It involves the sharing of electrons between two non-metals whose electronegativity difference is very similar to one another.
How much heat is released if 5.4 g of steam at 105°C is condensed to liquid water
at 100°C? A negative number means released.
Answer:
contain equal numbers of particles. ... MELTING POINT is the temperature at which a solid turns into liquid. ... Determine the energy required (in Joules) when the temperature of 3.21 grams of water increases by 4.0 °C ... Solve for at mater RW 100. ... How much heat energy is released when 12.8 g of barium oxide react with
Explanation:
What is the name for a substance made of billions of oppositely charged ions
joined together?
Answer:
Ionic substance
Explanation:
An ionic substance is formed when oppositely charged ions link up to form an infinitely large lattice structure that can only be described in terms of unit cells.
Ionic substances may consist of billions of oppositely charged ions. Ionic substances are hard, have high melting and boiling points and do not conduct electricity in the solid state because the ions are not free in the solid state.
However, in solution or molten state, the substance conducts electricity since the ions which are the charge carriers are now mobile.
Mass is a type of property that can be measured using a scale. Is mass considered a physical property or a chemical property? How do you know? It’s not a multiple choice
Answer:
Mass is an extensive physical property, it depends on the amount of matter being measured. It is physical because it can be measured without changing a substance's chemical identity.
Magnesium oxide forms from magnesium metal and oxygen gas O2. Write a word equation and an unbalanced formula including physical states.
Answer:
See explanation
Explanation:
The word equation is just a statement of the reaction in words as follows;
Magnesium oxide ----> Magnesium metal + oxygen gas
An unbalanced stoichiometric equation doesn't have equal number of atoms of each element on both sides.
Hence the unbalanced stoichiometric equation is as follows;
MgO(s) -----> Mg(s) + O2(g)
the places where the edges of the earth plates meet are called: A. Lithosphere B. mantle C. faultlines D. Earthquakes
The places where the edges of the earth plates meet is called ;
Faultlines ( C )The earth plates are made up of the earth's crust and the upper part of the Earth's mantle which are generally referred to as the Earth's lithosphere.
The Tectonic plates can be convergent, divergent or simply slide pass each other. The fault line is a crack on the earth crust due to movement of the plates, therefore at this point the edges of the earth plates meets each other due to the relative movement of the plates.
Hence we can conclude that the places where the edges of the earth plates meet are called fault lines of the earth.
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Which characteristic of a cell membrane alloes it to control materials entering and leaving a cell?
Answer:
B
Explanation:
The cell membrane is semipermeable that allows the movement of material in and out of the cell. The correct option is B.
What is a cell membrane?The cell membrane, also renowned as the plasma membrane, is detected in all cells as well as serves to differentiate the cell's interior from the outside environment.
The cell's membrane is comprised of a semipermeable lipid bilayer. The cell membrane controls the transport of materials into and out of the cell.
Proteins as well as lipids help compensate cell membranes. Because they are mostly made of lipids, only certain substances can pass through.
Phospholipids are the most common lipid found in membranes. Phospholipids are composed of two layers: outer and inner.
It also provides a consistent environment within the cell. And that membrane serves several purposes. One function is to transport nutrients into the cell, while the other is to transport toxic substances out of the cell.
Thus, the correct option is B.
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Which of the following digits are not considered significant in a number? Select all that apply.
non-zero digits
zeros that occur to the right of non-zero digits
zeros that occur to the left of non-zero digits
zeros that fall between non-zero digits
Answer:
The answer is only: C, zeros that occur to the left of non-zero digits
Explanation:
Help please the question is in the picture
Answer:
A and D.
Explanation:
A shows that people continued to use more and more fossil fuels until around the middle of the time period where the cost of certain fossil fuels doubled. This helps show that less people were willing to pay this price and would start looking for other means of fuel. This leeads to D.
As people looked for other fuel sources renewable energy uses reached a high in 2012 which was after the cost of certain fuels had doubled.
A sample of black mineral hematite, an oxide of iron found in many iron ores, contains 34.97g of iron and 15.03g of oxygen. what is the empirical formula of hematite?
The empirical formula : Fe₂O₃
Further explanationGiven
34.97g of Iron
15.03g of Oxygen
Required
The empirical formula
Solution
Mol ratio :
Fe(Iron) : 34.97 g : 56 g/mol = 0.624
O(Oxygen) : 15.03 g : 16 g/mol = 0.939
Divide by 0.624 :
Fe : O = 1 : 1.5
Fe : O = 2 : 3
1. Explain how a bright-line spectrum is produced, in terms of excited state,
energy transitions, ground state and subatomic particles?
The characteristics of the atomic models that the energy levels are discrete allow to explain the existence of bright lines in the emission spectra is:
The bright lines are the jump between two energy levels of an atom.
The energy levels of the atoms were initially explained by Bohr's model and later fully resolved and explained by quantum mechanics, in all these models they are discrete levels and there is nothing between them.
When the atoms are in their base state, all the electrons occupy the different levels allowed, before some excitation one of the electrons jumps from one level to another higher, after a period of time this electron falls back to the lower levels directly or by jumps if there are empty intermediate allowed levels, in each fall jump a little energy is released, this is the bright lines in the atomic spectra
The energy of the bright lines matches the difference in energy between the two levels involved.
In conclusion, the characteristics of the atomic models that the energy levels are discrete allow you to explain the existence of bright lines in the emission spectra.
The bright lines are the jump between two energy levels of an atom.
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What do ALL states of matter have in common?
Answer:
The common thing among the three states of matter is - They are made up of small tiny particles. They have a particular mass and can occupy space . This three states have volume in it . The atoms of this three states have force of attractions between them .
Explanation:
hope this helps <3
12. The letters C, AI, and Au are examples of
a. molecules
b. formulas
c. compounds
d. symbols
Answer:
d. Symbols.
Explanation:
Symbols are the abbreviations used to represent a particular thing. Similarly, chemical symbols are representative of the elements they denote based on their names.
The letters C stands for Carbon, Al for Aluminum, and Au for Gold. While it is easy to figure out the letters/ symbols and elements from the words that are their names, gold's symbol "Au" comes from the word "Aurum" which means yellow.
Thus, the above-given letters are examples of symbols.
Questioned document examiners prefer to work with copies of a questioned document in order to avoid damage to the original
material.
O True
O False
Ammonium Nitrate (NH4NO3), an important fertilizer, produces Dinitrogen monoxide gas (N2O) and water when it decomposes. Determine the mass of the water produced from the decomposition of 25.00 grams of solid Ammonium Nitrate.
Answer:
Mass = 11.23 g
Explanation:
Given data:
Mass of water produced = ?
Mass of ammonium nitrate decomposed = 25.0 g
Solution:
Chemical equation:
NH₄NO₃ → N₂O + 2H₂O
Number of moles of NH₄NO₃ :
Number of moles = mass/molar mass
Number of moles = 25.0 g/ 80.0 g/mol
Number of moles = 0.312 mol
Now we will compare the moles of NH₄NO₃ and H₂O
NH₄NO₃ : H₂O
1 : 2
0.312 : 2/1×0.312 = 0.624 mol
Mass of water formed:
Mass = number of moles × molar mass
Mass = 0.624 mol × 18 g/mol
Mass = 11.23 g
11.23 grams of water produced from the decomposition of 25.00 grams of solid Ammonium Nitrate.
How we calculate moles from mass?
We can determine the moles of any substance by using the equation:
n = W /M, Where:
n = no. of moles
W = given mass
And M = molar mass
Given balanced equation is:
NH₄NO₃ → N₂O + 2H₂O
Also given that mass of NH₄NO₃ = 25 g
Mole of NH₄NO₃ = 25 / 80 = 0.312 mol
From the stoichiometry of the reaction, ratio between NH₄NO₃ and water is 1:2; it means one mole of NH₄NO₃ will produce 2 moles of water.
Moles of water formed = 2 × 0.312 = 0.624 mol
Now we convert this mole to grams through following way:
W = n × M
W = 0.624 × 18 = 11.23 grams
Hence, produced mass of water is 11.23 grams.
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Is 2H2 + O2=2H2O a balanced equation
Explanation:
Yes, the equation is balanced. There are the same number of Hydrogen (H) and Oxygen (O) atoms on both sides of the equation.
The heat in a system is equivalent to the temperature of the system.
True
False
Answer:
False
Explanation:
Heat is the total kinetic energy possessed by molecules the body while temperature is the average kinetic energy possessed by the molecules of the body. Hence, the temperature and heat energy are different.
Which of the following is/are chemical changes? Select all that apply.
1. water boiling
2. vinegar and baking soda mixing and creating bubbles
3. dumping baking soda into water
4. a bike rusting while it sits outside
