Answer:
Double replacement or double decomposition
Explanation:
In the reaction below, a double replacement or double decomposition has occurred.
2Na₃PO₄ + 3CaCl₂ → 6NaCl + Ca₃(PO₄)₂
This reaction occurs mainly between two ionic substances.
The reaction involves an actual exchange of partners to form new compounds. For example;
AB + CD → AD + CB
One of the following conditions below serves as the driving force for double replacement reactions:
Formation of an insoluble compound or precipitate. Formation of water or any other non-ionizing compound Liberation of a gaseous product.
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The balanced equation :
2HCl + Zn ⇒ ZnCl₂ + H₂
Further explanationGiven
Reaction(unbalanced)
HCl + Zn ⇒ ZnCl₂ + H₂
Required
Balanced equation
Solution
Give a cofficient(the most complex compound=1)
aHCl + bZn ⇒ ZnCl₂ + cH₂
Make an equation
Zn, left = b, right = 1⇒b=1
Cl, left = a, right = 2⇒a=2
H, left = a, right = 2c⇒2c=a⇒2c=2⇒c=1
The equation becomes :
2HCl + Zn ⇒ ZnCl₂ + H₂
H2PO2- is polar.
True
False
Answer:
False
H2N2 is used in organic synthesis. This compound can exist as two distinct species, one that is polar and one that is nonpolar; but the H-H bond is said to be nonpolar.
An actual measurement of a sample is 3.5 m. The measured
value is 2.5 m. What is the percent error in the measurement?
a 27 percent
b 29 percent
C 10 percent
d 40 percent
Answer: b 29 percent
Explanation:
Answer:
B. 29 percent
Explanation:
hope this helps
A cup of water contains 13.9 moles of water. How many molecules of water are in the cup.
Answer:
The density of water is 1 gram per cc, so 1 mole of water takes 18cc of volume. 1 cup is approximately 250ml (i.e. 250cc) - so 1 cup will contain approximately 13.89 moles of water, which will contain approximately 8.36 x 1024 molecules of water.
Explanation:
1 mole of water requires 18cc of volume due to the density of water, which is 1 gram per cc. Since a cup contains roughly 250ml of liquid, it will likely contain 13.89 moles of water, or 8.36 × 10²⁴ molecules.
What is density ?
The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol, however the Latin letter D may also be used. The formula for density is mass divided by volume:
Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion. As long as an object's density is lower than the liquid's density, it will often float.
One of an object's most significant and practicable physical characteristics is density. Densities are frequently used to distinguish between pure materials, as well as to describe and infer the composition of various types of mixes.
Thus, 1 mole of water requires 18cc of volume due to the density of water, 8.36 × 10²⁴ molecules of water are in the cup.
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Isobutyl propionate is the substance that provides the flavour for rum extract. Combustion of a 1.152 g sample of C-H-O compound yields 2.726 g CO2 and 1.116 g H2O. What is the E.F of the compound?
Answer:
C₇H₁₄O₂
Explanation:
From the question given above, the following data were obtained:
Mass of compound = 1.152 g
Mass of CO₂ = 2.726 g
Mass of H₂O = 1.116 g
Empirical formula =?
Next, we shall determine the mass of carbon, hydrogen and oxygen present in the compound. This can be obtained as follow:
For carbon (C):
Mass of CO₂ = 2.726 g
Molar mass of CO₂ = 12 + (2×16)
= 12 + 32
= 44 g/mol
Mass of C = 12/44 × 2.726
Mass of C = 0.743 g
For hydrogen (H):
Mass of H₂O = 1.116 g
Molar mass of H₂O = (2×1) + 16
= 2 + 16
= 18 g/mol
Mass of H = 2/18 × 1.116
Mass of H = 0.124 g
For oxygen (O):
Mass of compound = 1.152 g
Mass of C = 0.743 g
Mass of H = 0.124 g
Mass of O =?
Mass of O = (Mass of compound) – (Mass of C) + (Mass of H)
Mass of O = 1.152 – (0.743 + 0.124)
Mass of O = 1.152 – 0.867
Mass of O = 0.285 g
Finally, we shall determine the empirical formula for the compound as follow:
C = 0.743 g
H = 0.124 g
O = 0.285 g
Divide by their molar mass
C = 0.743 / 12 = 0.062
H = 0.124 / 1 = 0.124
O = 0.285 / 16 = 0.018
Divide by the smallest
C = 0.062 / 0.018 = 3.44
H = 0.124 / 0.018 = 7
O = 0.018 / 0.018 = 1
Multiply by 2 to express in whole number.
C = 3.44 × 2 = 7
H = 7 × 2 = 14
O = 1 × 2 = 2
Empirical formula => C₇H₁₄O₂
What results from the sharing of electron pairs between two atoms?
Answer:
the electrical attraction between large numbers of cations and anions. Results from the sharing of electron pairs between two atoms. ... A covalent bond in which the bonded atoms have an unequal attraction for the shared electrons.
Explanation:
What is the actual yield of a reaction?
A. The calculated amount of product
B. The fractional amount of product
C. The predicted amount of product
D. The measured amount of product
According to the following reaction, how many grams of sulfur trioxide will be formed upon the complete reaction of 31.6 grams of oxygen gas with excess sulfur dioxide? 2SO2 (g) + O2 (g) 2SO3 (g)
HELP!
True or false: When there are zero lone pairs on the central atom, the shape is
symmetrical (assuming all of the bonds are the same).
0.93 mol/L*1.85L
0.93 mol/L *0.225L
612.2g/0.36 mL
Answer:
(0.93 (mol / L)) * 1.85 L = 1.7205 moles
(0.93 (mol / L)) * 0.225 L = 0.20925 moles
(612.2 grams) / (0.36 mL) = 1700 555.56 kg / m^3
Explanation:
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Which belongs in each place
Answer:
1. Oxygen Nitrogen
2. silicon Nitrogen
3. Carbon dioxide
Not sure about the 2nd one
Explanation:
prove me wrong
How many atoms of iodine are in 12.75g of CaI2? Hint. How many Iodines are there in one CaI2 particle?
(Answer) atoms of I (4 SF)
Answer:
[tex]5.225x10^{22}atoms\ I[/tex]
Explanation:
Hello!
In this case, since 12.75 g of calcium iodide has the following number of moles (molar mass = 293.89 g/mol):
[tex]n_{CaI_2}=12.75gCaI_2*\frac{1molCaI_2}{293.89gCaI_2}=0.0434molCaI_2[/tex]
In such a way, since 1 mole of calcium iodide contains 2 moles of atoms of iodine, and one mole of atoms of iodine contains 6.022x10²³ atoms (Avogadro's number), we compute the resulting atoms as shown below:
[tex]atoms\ I=0.0434molCaI_2*\frac{2molI}{1molCaI_2} *\frac{6.022x10^{23}atoms\ I}{1molI} \\\\atoms\ I = 5.225x10^{22}atoms\ I[/tex]
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When air pressure rapidly falls, what weather change usually occurs?
hope this helps
Explanation:
a prolong storm will occur
that's what I found
Rank the effective nuclear charge Z* experienced by a valence electron in each of these atoms:
atom Z* experienced by a valence electron.
An atom of sodium. (pick one)
An atom of chlorine. (pick one)
An atom of silicon. (pick one)
An atom of magnesium. (pick one)
Answer:
Si > Al > Mg > Na
Explanation:
In an atom, there is the positively charged particle' the proton, the negatively charged particle; the electron and neutral charged particle; the neutron. The effect of the proton on an atom that is the ability of these positive particles to attract the negative[valence electrons] particles is known as Effective nuclear charge.
[1]. Electron configuration of Silicon, Si = (1s²2s²2p⁶) 3s²3p².
The configuration part of Si in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 14, the inner electrons= 10. Thus, effective nuclear charge = 14 - 10 = 4.
[2]. Electron configuration of Aluminum, Al = (1s²2s²2p⁶) 3s²3p¹.
The configuration part of Al in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 13, the inner electrons= 10. Thus, effective nuclear charge = 13 - 10 = 3.
[3]. Electron configuration of Magnesium, Mg = (1s²2s²2p⁶) 3s²
The configuration part of Mg in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 12, the inner electrons= 10. Thus, effective nuclear charge = 12 - 10 = 2.
[4]. Electron configuration of sodium, Na = (1s²2s²2p⁶) 3s¹.
The configuration part of Na in bracket is known as the inner electrons while the ones without brackets are the outer/valence electrons.
The total number of electrons = 11, the inner electrons= 10. Thus, effective nuclear charge = 11 - 10 = 1.
queous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 6.93 g of hydrochloric acid is mixed with 2.4 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 2 significant digits. g
Answer:
Explanation:
NaOH + HCl = NaCl + H₂O
1 mole 1 mole 1 mole
6.93 g of HCl = 6.93 / 36.5 mole = .19 mole
2.4 g of NaOH = 2.4 /40 mole of NaOH = .06 mole
.06 mole of NaOH is less than .19 mole of HCl so
limiting reagent is NaOH
.06 mole of NaOH will react with .06 mole of HCl to give .06 mole of water .
water formed by given mass of reactants
= .06 moles of water
= .06 x 18 gram of water
= 1.08 g of water .
= 1.1 g of water .
She collected 20 cm³ of oxygen. What volume of hydrogen could she also have collected at the same time?
Answer:
Assuming it was collected from the atmosphere it would be virtually nothing
Explanation:
hydrogen makes up 0.000055% of the atmosphere while oxygen makes up 23 percent. 20/400000 cm^3 of hydrogen
Four molecules of solid sodium react with one molecule of oxygen gas to yield 2 molecules of solid Sodium oxide.
Answer:
reaction?
Explanation:
4na + o2 → 2na2o
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Which statement best describes the model below?
Answer:
Option D
Explanation:
Because we know the relationship between no of moles and volume
Volume is directly proportional to no of molesSo if moles is increased volume would be increased too .Option D
What are the monomers of nucleus acids
Answer:
The term nucleic acid is the overall name for DNA and RNA.
Explanation:
They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base.
Answer:
Nucleotide
Explanation:
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n2+3H2=2NH3 finds equilibrium concentrates of N2-0.1M, H2=0.05M and NH3=0.001M what’s the Equilibrium constant Kc?
List the 5 characteristics of a
physical change
Answer:
A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density ( is this it )
Below are pictures of a coastline and a river. Which of the following changes to the Earth's surface can be caused by wind and water
Answer: tsunami no cap
Explanation:
how is the process of neutralization reaction like the procesd of mixing white and black paints to get gray
Answer:
Acid neutralizes base to form salt and water while white colour neutralizes black colour to form grey colour.
Explanation:
Neutralization is simply the process whereby an acid and a base are mixed to produce salt and water. Now, this reaction also involves the mixing of the hydrogen ions of the acid and hydroxide ions of the base to form the salt and water. It is similar to mixing 2 paints to form another colour in that in the neutralization reaction 2 compounds are mixed to neutralize each other to form another compound while in mixing black and white to form grey the two colors are mixed together and thereby neutralized to form another colour which is grey.
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Planet Average Orbital Speed
Mercury 47.87 km/s
Venus 35.02 km/s
Earth ? km/s
Mars 24.077 km/s
Jupiter 13.07 km/s
Saturn 9.69 km/s
Uranus 6.81 km/s
Neptune 5.43 km/s
The table above shows the average orbital speed of each planet. The planets are listed in order of increasing distance from the Sun, with Mercury being the nearest and Neptune the farthest.
How does the Earth compare in orbital speed to the other planets?
A.
The Earth moves faster than the planets that are farther from the Sun.
B.
The Earth moves at the same speed as all the other planets
C.
The Earth moves at a slower speed than all the other planets.
D.
The Earth moves faster than the planets that are closer to the Sun.
The earth moves faster than the planets that have farther from the sun
Answer:
The Earth moves faster than the planets that are farther from the Sun.
Explanation:
Based on the data in the table, orbital speed decreases as distance from the Sun increases. Each planet, including Earth, moves slower than the planets that are closer to the Sun but faster than the planets that are farther from the Sun. Earth's average orbital speed (29.78 km/s) fits this pattern.
Determine what ions are present when the following dissociates or ionizes in water. Include states of
matter.
KNO3
Cation:
Anion:
Cation is [tex]K[/tex] and anion is [tex]NO3[/tex] in the dissociates or ionizes in water.
What is molecule?A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion.In quantum physics, organic chemistry, and biochemistry, the distinction from ions is dropped and molecule is often used when referring to polyatomic ions.
The simplest forces between atoms are those which arise as a result of electron transfer. A simple example is that of say sodium fluoride. The sodium atom has a nuclear charge of +11, with 2 electrons in the K shell, 8 in the L shell and 1 in the M shell. The fluorine atom has a nuclear charge of 9 with 2 electrons in the K shell and 7 in the L shell.
The pair of electrons are know as bonding pairs and the stable balance of attractive and repulsive forces between atoms.The covalent compounds do not contain electricity.The covalent compounds are having lower enthalpies of vaporization and fusion.The covalent compounds are easily catches fire and are more flammable than ionic compounds.
Therefore,Cation is [tex]K[/tex] and anion is [tex]NO3[/tex] in the dissociates or ionizes in water.
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When matter is heated, particles within the matter will.
A. speed up.
B. produce sounds.
C. change into different types of particles. D change colors.
Propane reacts with elemental oxygen gas according to the unbalanced reaction, C3H8(g) + O2(g) → CO2(g) + H2O(l). What is the coefficient of the water, H2O(l), in the balanced reaction?
a
2
b
4
c
6
d
8
Answer:
b. 4
Explanation:
The reaction expression is given as:
C₃H₈ + O₂ → CO₂ + H₂O
To solve this problem, we employ a mathematical approach.
Now use coefficient a, b, c and d as the numbers that will balance the expression:
aC₃H₈ + bO₂ → cCO₂ + dH₂O
Conserving C: 3a = c
H: 8a = 2d
O: 2b = 2c + d
let a = 1, c = 3, d = 4 , b = 5
The balanced reaction expression is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Explain why the surface of the tire melts.
Answer:
Why Heat Causes Tires to Expand and Blow Out
Explanation:
The air pressure in tires increases as the temperature goes up. ... Such a big difference it can cause a tire to pop. Even if it doesn't give out, over-inflation can cause a tire to prematurely wear and interfere with braking.
Solid iron(III) oxide (Fe,O3) reacts with hydrogen gas (H) to form iron and
water.
Salanced Equation: 1 Fe,0+ 3 H2 → 2 Fe + 3 H,0
. How many grams of iron are produced when 450 grams of iron(ill) oxide are
reacted?
8. How many grams of water will be produced when 0.0155 moles of hydrogen
gas react completely with iron(III) oxide?
