Answer:
C. Neither accurate nor precise
Explanation:
The student's results would be considered precise if they were close to one another. However they vary significantly from one another.Regarding accuracy, they would be considered accurate if they were close to the actual value. The given results are too far away from the actual value.Thus the results are neither accurate nor precise.
Four atoms have the numbers of protons and neutrons given below.
Which two atoms are isotopes of the same element?
W: 8 protons and 8 neutrons
X: 8 protons and 10 neutrons
Y: 10 protons and 8 neutrons
Z: 9 protons and 10 neutrons
X and Y
W and X
X and Z
Answer:
W and X
Explanation:
isotopes : are masses of atoms with the same number of proton and electron but different neutron .
W and X have the same number of protons and different number of neutrons.
wuuutttttt....help me
What is the net ionic equation for the reaction below?
2H+ + CO32– + 2Na+ + 2OH– 2Na+ + CO32– + 2H2O
Answer:
The given reaction in your problem is the ionic equation for an acid (carbonic acid) reacting with a base (sodium hydroxide). All components of the reaction are then written in ionic form except for reactant weak electrolytes and the driving force product compound of the reaction (H2O). See following explanation.
Explanation:
Metathesis Rxn: molecular equation of rxn
H₂CO₃(aq) + 2NaOH(aq) => Na₂CO₃(aq) + 2H₂O(l)
Ionic Equation: shows all components of the reaction
H₂CO₃(aq) + 2Na⁺(aq) + 2OH⁻(aq) => 2Na⁺(aq) + CO₃²⁻(aq) + 2H₂O(l)
H₂CO₃(aq) wk. electrolyte and H₂O(l) driving force compound are not shown ionized in ionic equation. Only strong electrolytes that ionize 100%; i.e., salts and strong acids and bases.
Net Ionic Equation: shows only the reactive components without the spectator ions (nonreactive components), in this case, the Na⁺(aq) ions.
H₂CO₃(aq) + 2OH⁻(aq) => CO₃²⁻(aq) + 2H₂O(l)
9 The Haber process is a reversible reaction. N2(g) + 3H2(g) 2NH3(g) The reaction has a 30% yield of ammonia. Which volume of ammonia gas, NH3, measured at room temperature and pressure, is obtained by reacting 0.75 moles of hydrogen with excess nitrogen?
Answer: 3.36 L of ammonia gas
Explanation:
The balanced chemical reaction is:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to stoichiometry :
3 moles of [tex]H_2[/tex] produce = 2 moles of [tex]NH_3[/tex]
Thus 0.75 moles of [tex]H_2[/tex] will producee=[tex]\frac{2}{3}\times 0.75=0.50moles[/tex] of [tex]NH_3[/tex]
But as percent yield is 30 %, amount of ammonia produced = [tex]\frac{30}{100}\times 0.50moles=0.15moles[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure = 1 atm
V = Volume = ?
n = number of moles = 0.15
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]273K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.15\times 0.0820 L atm/K mol\times 273K}{1atm}=3.36L[/tex]
Thus 3.36 L of ammonia gas is obtained by reacting 0.75 moles of hydrogen with excess nitrogen.
3.36 L of ammonia gas.
The balanced chemical reaction is:
[tex]N_2(g) + 3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to the above reaction:- :
3 moles of [tex]H_2[/tex] produce = 2 moles of [tex]NH_3[/tex]
Thus 0.75 moles of [tex]H_2[/tex] will produce[tex]\frac{2}{3} \times0.75=0.50\ mol\ NH_3[/tex]
But as percent yield is 30 %, amount of ammonia produced = [tex]\frac{30}{100} \times0.50\ moles\\\\=0.15\ moles[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure = 1 atm
V = Volume = ?
n = number of moles = 0.15
R = gas constant =0.0821 Latm\Kmol
T =temperature =273 K
[tex]V=\frac{nRT}{P} \\\\=\frac{0.15\ times0.0820\ Latm\Kmol\times273\ K}{1\ atm} \\\\=3.36\L[/tex]
Hence, 3.36 L of ammonia gas is obtained by reacting 0.75 moles of hydrogen with excess nitrogen.
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In certain species of fish, scale color can either be blue, yellow, or blue and yellow striped. If a blue fish and a blue/yellow striped fish mate, what color scales could their offspring have?
Answer:
Blue scale or blue/yellow stripe scale
Explanation:
Let us assume that the blue color is represented by B allele while the yellow color is represented by Y allele. The two alleles are equally dominant on one another, hence, BY would represent blue and yellow stripe gene.
Blue scale - BB
Yellow scale - YY
Blue/yellow striped scale - BY
Crossing BB and BY
BB x BY
BB BY BB BY
Hence, their offspring is either BB (blue scale) or BY (blue/yellow stripe scale).
Baking soda (sodium bicarbonate) is a compound commonly used in baked goods, as a deodorizer in refrigerators, and as an antacid. Commercial quantities of baking soda are produced by mixing soda ash dissolved in water with carbon dioxide. Baking soda precipitates as a solid from this method:
Na2CO3 + CO2 + H2O → 2NaHCO3
How many grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate?
Answer:631 g
Explanation: bc i did the math
630.581 grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate.
How we calculate moles from grams?Moles can be related to the mass or weight of any substance as follow:
n = W/M, where
W = given mass
M = molar mass
Given balanced chemical equation for the formation of sodium bicarbonate is:
Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃
From the stoichiometry of the reaction, it is clear that:
1 mole of Na₂CO₃ is required = to form 2 moles of NaHCO₃
Or 1/2 mole of Na₂CO₃ is required = to form 1 moles of NaHCO₃
Moles of NaHCO₃ be calculated by using the above formula as:
n = 1,000g (given) / 84.007g/mole = 11.90 moles
So, moles of Na₂CO₃ required to form 11.90 moles of NaHCO₃ = 11.90×1/2 = 5.95 moles
Now we convert the mole of Na₂CO₃ to grams by using the mole formula:
W = 5.95mole × 105.98g/mole = 630.581 grams.
Hence, 630.581 grams of soda ash would be needed.
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Plz answer!!! Due in 10 minutes!!! Will give BRAINLIEST and extra points to first correct answer!!!
Answer:
B
Explanation:
u do the math and you will get the answer
Answer:
D.
because it would be impossible to get a precise measurement if the mass of the product without the equipment.
Why was the South American and African plate moved apart gradually?
Answer:
The South American and African plates moved apart as a divergent boundary formed between them and an ocean basin formed and spread. Students figure out: The Mesosaurus fossils moved apart gradually over tens of millions of years. Earth's plates travel at a rate too slow to be experienced by humans.
Explanation:
can you help please?
Answer:
no
Explanation:
I don't know anything sorry for inconvenience
After reading about the kinds of changes that occur, Yara saw some rust on a pipe that was
going into her house. What kind of change is the formation of rust? *
reactant
product
chemical
physical
Answer:
chemical
Explanation:
Chemical change is a type of change that involves the formation of new substances. The process of forming this new substance is irreversible i.e. cannot be changed back into it's normal form. Chemical changes is characterised by color changes, gas evolution etc.
In this case, a RUST on a pipe is being described. This rust is a type of chemical change because it involves a change in color and also a new substance is formed.
percent composition is
ASAPPPPP
how do 2 positive charge move in an electric field
Answer:
yer
Explanation:
Which gas sample contains the smallest number of molecules?
Answer:
A.4 g of helium
Explanation:
I think so
Explain how increasing the pressure of a gas affects rate of reaction.
Explain why the mass of the powder is greater than the mass of the magnesium metal.
Answer:
because when it burns reacts with oxygen forming mg oxide
Measurements of a compound reveal that it is 36% carbon, 6% hydrogen, and 48% oxygen, with systematic
error accounting for the remaining 10%. Which of the following is the most accurate empirical formula for
this compound?
Answer:
Empirical Formula = CH₂O
Explanation:
C = 36% => 36g/12g/mol = 3 moles
H = 6% => 6g/1g/mol = 6 moles
O = 48% => 48g/16g/mol = 3 moles
C:H:O Empirical Ratio reduced to smallest whole number ratio (i.e.; divide by the smaller mole value)
=> (3 moles/3 moles) : (6 moles/3 moles) : (3 moles/3 moles)
=> 1:2:1
∴Empirical Formula = CH₂O
Give six examples of complex compounds.
Answer:
Examples of complex compound include potassium ferrocyanide K4[Fe(CN)6] and potassium ferricyanide K3[Fe(CN)6]. Other examples include pentaamine chloro cobalt(III) chloride [Co(NH)5Cl]Cl2 and dichlorobis platinum(IV) nitrate [Pt(en)2Cl2](NO3)2.
The energy required to make a compound from its elements is called
Answer:
heat of formation i think
Answer:
Enthalpy energy
Explanation:
Because energy make bonds and energy break bonds.
A 7.50 liter sealed jar at 18 degrees C contains 0.125 moles of oxygen and 0,125 moles of nitrogen gas. What is the pressure in the container?
what type of ion do elements from each of the following groups form ,
group1
group 7.
Answer:
group 1 - cations charge +1
group 7 - anions charge -1
Explanation:
Group 1 has one valence electron and will lose one electron to complete the octet.
Group 7 has 7 valence electrons and will accept an electron to complete the octet.
Group 1 elements form cations while group 7 elements form anions as per their electronic configuration.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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will these compounds have triple, single, or double bonds ?
C02
Br2
Answer:
double bond
Explanation:
it contains combinations
How many atoms in 98.2 g of He?
How many grams of Silver Nitrate must be added to the solution to completely react with Sodium Chloride according to the reaction below:
NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)
Answer:
5.81g of AgNO₃ must be added
Explanation:
The solution contains 2.00g of sodium chloride.
Based on the reaction, 1 mole of NaCl reacts per mole of AgNO₃. To solve this question, we need to find the moles of NaCl in 2.00g and, these moles = Moles of AgNO₃ that must be added:
moles NaCl = Moles AgNO₃-Molar mass: 58.44g/mol:
2.00g * (1mol / 58.44g) = 0.0342 moles NaCl = Moles AgNO₃
Mass AgNO₃ -Molar mass: 169.87g/mol-:
0.0342 moles * (169.87g / mol) =
5.81g of AgNO₃ must be addedThe quantity of [tex]AgNO_{3}[/tex] required to be added to the solution in order to allow it to entirely react with Sodium Chloride as per the reaction provided would be:
- [tex]5.81g[/tex] of [tex]AgNO_{3}[/tex]
Given that,
The amount of NaCl in the solution = 2g
As we know,
NaCl's 1 mole would react with [tex]AgNO_{3}[/tex]'s every mole.
To find,
The quantity of [tex]AgNO_{3}[/tex] required to be added to the solution for complete reaction = ?
We will determine the number of moles in 2g of NaCl which would be the number to be added to the solution.
So,
NaCl moles = Moles [tex]AgNO_{3}[/tex] - Molar mass
[tex]= 58.44g/mol[/tex]
Now,
[tex]AgNO_{3}[/tex] moles [tex]= 2g[/tex] × [tex](1mol / 58.44g)[/tex]
[tex]= 0.0342[/tex] moles NaCl = Moles of [tex]AgNO_{3}[/tex]
∵ Mass of [tex]AgNO_{3}[/tex] - Molar mass
= [tex]5.81g[/tex] of [tex]AgNO_{3}[/tex]
Thus, [tex]5.81g[/tex] of [tex]AgNO_{3}[/tex] is the correct answer.
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ASAP
The directions "shake well before using" are listed on special types of heterogeneous mixtures called
A- Solutions
B- Suspensions
I am currently learning this and I would say Suspensions!
Hope this helps :)
Balance the equation by putting the correct number in front of each compound. You can work this out mathematically or by drawing pictures on a piece of paper like the videos.
Al + 02--> Al203 corrosion of aluminum
Answer:
4Al + 3O₂ —> 2Al₂O₃
The coefficients are: 4, 3, 2
Explanation:
__ Al + __ O₂ —> __ Al₂O₃
The above equation can be balance as illustrated below:
Al + O₂ —> Al₂O₃
There are 2 atoms of O on the left side and 3 atoms on the right side. It can be balance by writing 3 before O₂ and 2 before Al₂O₃ as shown below:
Al + 3O₂ —> 2Al₂O₃
There are 4 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 4 before Al as shown below:
4Al + 3O₂ —> 2Al₂O₃
Now the equation is balanced.
The coefficients are: 4, 3, 2
1. Sam needs to know the volume of a cardboard box. Which tool
would he use to find the measurements he needs to calculate
volume?
A)ruler
B(balance
C) spring scale
D)thermometer
How do you write 400000 in scientific notation?
Answer:
4 x 10 5
Explanation:
Which of these results in kinetic energy of an object? position mchotion
Answer:
..... yep
Explanation:
tep no yep no hyshshshss
motion results in the kinetic energy of an object
Which example would result in new cells that are most different from the parent cells?
a. yeast cells splitting into new cells
b. bacteria cells dividing into new cells
c. sperm and egg cells uniting to produce fertilized egg cells
d. skin cells dividing to produce more skin cells
Answer:
a
Explanation:
its a lol
How is the periodic table organised?
The periodic table brings order to information about the chemical elements. The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties.