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How many molecules of excess reactant remain after the reaction is complete?
2 H2 + O2 --> 2 H2O
O 4
O 2
O 6
O 8
The Sup atomic particles are
Answer:
protons, neutrons and electrons
Explanation:
i hope it is
Answer:
proton, electron, neutorn
Help me out here please???
Answer:
A
Explanation:
Answer:
B
Explanation:
In a chemical reaction, the number of each element should be equal on both the reactant and product side.
How many moles are present in 60 grams of hydrochloric acid, HClHClH?
a. 1.65 moles
b. 36.45 moles
c. 60 moles
Selected:d. 1.40 moles
Answer:
C 60
Explanation:
A neutral atom of Cobalt (Co) has an atomic number of 27 and an atomic mass of 59. Therefore, Co has _________________________
Answer:
A neutral atom of Cobalt (Co) has an atomic number of 27 and an atomic mass of 59. Therefore, Co has 27 electrons, 27 protons and 32 neutrons.
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
The atomic number Co is 27 it means it has 27 protons and 27 electrons.
The mass number is sum of protons and neutrons, thus number of neutrons are
59 - 27 = 32 neutrons
List two metals that will not react with acid
Answer:
Copper(cu) nd gold(au) will not react with acid at all
Explanation:
please help
How many joules of heat are needed to raise the temperature of 250 g of liquid weer by 500°C
Answer:
What is the total number of joules of heat energy needed to 16) How many joules of heat ... raise the temperature of 10 grams of water from 20°Сto ... 2) · The temperature of 100 grams of water changes from 16°C/7How many kilojoules of ... temperature of 500. grams of water from 10.0°C to 30.0°C? ... m250 -Q=209051. | c= ...
Explanation:
I hope I help :))
One mole of gas occupies a volume of 1 litres at 27 ° C.what will be pressure of gas?
Answer:
P = 24.63 atm
Explanation:
Given data:
Number of moles of gas = 1 mol
Volume of gas = 1 L
Temperature of gas = 27°C
Pressure of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
27+273 = 300 K
P ×1 L = 1 mol × 0.0821 atm.L/ mol.K × 300 K
P = 24.63 atm.L /1 L
P = 24.63 atm
A wavelength is the___
of one ____ ____
Answer: A wavelenghth is the distance between successive crests of one wave.
waves move fastest in?
low temperature gasses
low temperature solids
high temperature gasses
high temperature solids
Answer:
High temperature solids
Explanation:
Just got the quiz done
Hydrofluoric acid (HF) can be prepared according to the following equation:
CaF2 + H2SO4 2 HF + CaSO4.
How many grams of HF can be prepared from 75.0 g of H2SO4 and 63.0 g of CaF2?
In the above problem, which reactant is limiting and which is in excess?
Given the balanced equation:
( Reaction type : double replacement)
CaF2 + H2SO4 → CaSO4 + 2HFI
We can determine the number of grams prepared from the quantity of 75.0 H2SO4, and 63.0g of CaF2 by converting these grams to moles per substance.
This can be done by evaluating the atomic mass of each element of the substance, and totaling it to find the molecular mass.
For H2SO4 or hydrogen sulfate it's molecular mass is the sum of the quantity of atomic mass per element. H×2 + S×1 + O×4 = ≈1.01×2 + ≈32.06×1 + ≈16×4 = 2.02 + 32.06 + 64 = 98.08 u (Dalton's or Da) or g / mol.
For CaF2 or calcium fluoride, it's molecular mass adds 1 atomic mass of calcium and 2 atomic masses of fluoride due to the number of atoms.
Ca×1 + F×2 = ≈40.07×1 + ≈19×2 = 40.08 + 38 = 78.07 u (Da or Dalton's) or g / mol.
The limiting reactant in the given balanced reaction is sulphuric acid. The mass of HF produced from 75 g of H₂SO₄ is 30 g.
What is limiting reactant?The limiting reactant in a species is the reactant which is fewer in amount and thus determine the yield of the product.
In the given reaction, one mole of calcium fluoride reacts with one mole of sulphuric acid to give two moles of HF. The molar mass of calcium fluoride CaF₂ is 78 g/mol the weight taken here is 63 g. Thus number of moles is 63/78 = 0.87 moles.
The molar mass of sulphuric acid H₂SO₄ is 100g/mol. The weight taken here is 75 g and thus, number of moles is 75/100 = 0.75 moles. One mole of calcium fluoride need one mole of H₂SO₄ . Thus 0.87 neede 0.87 moles of H₂SO₄ . But here we have only 0.75. Thus it is the limiting reactant.
As per the reaction, one mole or 100 g of H₂SO₄ produce 2 moles or 40 g of HF (molar mass = 20 g/mol). Thus mass of HF produced from 75 g is calculated as follows:
mass of HF = (75 × 40)/100
= 30 g.
Hence, mass of HF produced in this reaction is 30 g.
To find more about limiting reactant, refer the link below:
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What two uses are used for oxygen?
Answer:
I think your lumgs and your heart but I could be tottaly wrong
what's the functional group if ch3c2ch3oh
if we weigh 30 kgf on the earth,how much will you weigh on the moon
Answer:
5
Explanation: 1/6 of 30 is 5
How do the energy and the most probable location of an electron in the third shell of an atom compare to the energy and the most probable location of an electron in the first shell of the same atom?
Answer:
In the third shell, an electron has more energy and is farther from the nucleus. (3) In the third shell, an electron has less energy and is closer to the nucleus.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, atom consists of shells having different energy.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
In the third shell, an electron has more energy and is farther from the nucleus. (3) In the third shell, an electron has less energy and is closer to the nucleus.
Therefore, atom consists of shells having different energy.
To know more about atom, here:
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if a baloon filled with dry hydrogen weighs 35 gram,but weighs 440 grams when filled with the vapour of an organic compound. calculate the vapour density and RMM of the organic compound.
Answer:
1) The vapor density of the organic compound is approximately 12.57
2) The relative molar mass (RMM) of the organic compound is approximately 25.14 grams
Explanation:
1) The mass of the balloon filled with dry hydrogen = 35 grams
The mass of the balloon filled with vapor of an organic compound = 440 grams
The vapor density = (Weight of a given volume of gas)/(Weight of equal volume of hydrogen)
The vapor density of the organic compound = (440)/(35) ≈ 12.57
The vapor density of the organic compound ≈ 12.57
2) The relative molar mass (RMM) = 2 × vapor density
The relative molar mass (RMM) of the organic compound = 2 × vapor density of the organic compound
The relative molar mass (RMM) of the organic compound ≈ 2 × 12.57 ≈ 25.14 grams
The relative molar mass (RMM) of the organic compound ≈ 25.14 grams
Convert 6.7 x 1024 molecules of nitrogen dioxide into grams.
Answer:
510 g NO₂
General Formulas and Concepts:
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Reading the Periodic TableWriting CompoundsUsing Dimensional AnalysisExplanation:
Step 1: Define
6.7 × 10²⁴ molecules NO₂ (Nitrogen dioxide)
Step 2: Define conversions
Avogadro's Number
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of NO₂ - 14.01 + 2(16.00) = 46.01 g/mol
Step 3: Use Dimensional Analysis
[tex]6.7 \cdot 10^{24} \ molecules \ NO_2(\frac{1 \ mol \ NO_2}{6.022 \cdot 10^{23} \ molecules \ NO_2} )(\frac{46.01 \ g \ NO_2}{1 \ mol \ NO_2} )[/tex] = 511.901 g NO₂
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
511.901 g NO₂ ≈ 510 g NO₂
what is the chemical formula for silver sulfate
Answer:
Ag2SO4
Explanation:
Which of the following is an oxidation-reduction reaction? ZnS(s) + 2O2(g) ZnSO4(s) CaO(s) + H2O(l) Ca(OH)2(s) 6Li2O(s) + P4O10(g) 4Li3PO4(s) SO2(g) + H2O(l) H2SO3(aq)
ZnS(s) + 2O₂(g) ⇒ZnSO₄(s)
Further explanationThe oxidation-reduction reaction or abbreviated as Redox is a chemical reaction in which there is a change in oxidation number
Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.
Reaction
ZnS(s) + 2O₂(g) ⇒ZnSO₄(s)
S²⁻ (-2 in ZnS) to S⁺⁶(+6 in ZnSO₄) ⇒ oxidation
O₂(0 in O₂) to O⁻²(-2 in ZnSO₄)⇒ reduction
Answer:
A. ZnS(s) + 2O2(g) Right arrow. ZnSO4(s)
Explanation:
The logarithimic formula is not as complicated as it seems. For example, what is the pH of a solution with a H+ concentration of 1.00 x 10^-4 M?
Answer:
pH of given solution is 4
Explanation:
Given data:
pH of solution = ?
Concentration of H⁺ = 1.00 ×10⁻⁴M
Solution:
Formula:
pH = -log[H⁺]
pH = -log[ 1.00 ×10⁻⁴]
pH = 4
Thus, the pH of given solution is 4.
Which evidence is an indication that a chemical reaction has occurred?
formation of a gas
melting of a substance
boiling of a substance
freezing of a substance
Answer: Formation of a gas
Explanation: All of the other options are examples of physical changes not chemical change
Answer:
A. Formation of gas
Explanation:
Took the test and got it correct
What is the formula of copper (iii) carbonate? And what is the name of CuPO4?
which of the following is NOT a substance?
A. sodium
B. water
C. alcohol
D. air
E. table salt
can select more than one if needed
Answer:
c. alcohol
it has no substance
what happens when you add a second drip and space both the drips close together? Describe the pattern they form and explain the cause for this pattern in detail.
Answer:
Superposition results in adding the two waves together. Constructive interference is when two waves superimpose and the resulting wave has a higher amplitude than the previous waves. Destructive interference is when two waves superimpose and cancel each other out, leading to a lower amplitude.
Explanation:
I hope I hlep :)
describe how electricity moves through wires
Which symbol and unit of measurement are used for electric current?
a. symbol: C; unit: A
b. symbol: 1; unit: C
C. symbol: 1; unit: A
Answer:
C. symbol: 1; unit: A
Explanation:
The symbol and unit of electric current is given as symbol: I; unit: A
Current is one of the fundamental particles. The unit is given in Amperes which is symbolized as A. Current is given as IAccording to ohms law;
I = [tex]\frac{V}{R}[/tex]
I is the current
V is the voltage
R is the resistance.
Suppose while walking along the beach, you find a green crystal. Which properties could you use to determine whether the crystal is an emerald?
Explanation:
Emerald is defined by its green color. To be an emerald, a specimen must have a distinctly green color that falls in the range from bluish green to green to slightly yellowish green. To be an emerald, the specimen must also have a rich color.
A car is traveling with velocity of 40 m/s and has a mass of 1120 kg. The car has __________ energy.
A. Kinetic
B. Potential
Answer:
A.
Explanation:
The car has kinetic energy.
What relationship between the speed of each car and its motion after the collision do you observe? How do Newton's laws help explain your observations?
Answer:
I think that the previous answer will help you with this one, Newton´s laws explain it because of the action-reaction law, the resulting forces will be balanced or overloaded in one object, depending of the mass acceleration/speed or force applied to one object.
Explanation:
how many moles of carbon are in 3.0 moles of c6h12o6
Answer:
i.e. mass of 1 mole of glucose, C6H12O6 = (6 × 12.01 + 12 × 1.01 + 6 × 16.00) g = 180.18 g (using atomic weight data to 2 decimals) 1 mole of carbon atoms weighs 12.01 g and there are 6 moles of C atoms in 1 mole of glucose, so the mass of carbon in 1 mole of glucose = 6 × 12.01 g = 72.06 g.
