Answer:
I had this question and it was the 4th one for me
Explanation:
Arrange the following elements (E, K, P, B) according to increasing atomic radius
Answer:
B
P
K
Explanation:
K: 203pm
B: 84pm
P: 107pm
There isn't an E on the Periodic Table?!
Benzene has been used as a solvent for waxes and oils. In 1981 the EPA listed benzene as a carcinogen. What is the molecular formula of benzene if the empirical formula is C1H1, and the approximate molar mass is 78 g/mol
Answer:
C₆H₆
Explanation:
From the question given above, the following data were obtained:
Empirical formula = CH
Molar mass of compound = 78 g/mol
Molecular formula =?
The formula of the compound can be obtained as follow:
Molecular formula = n × Empirical formula
Molecular formula = ₙ[CH]
n[CH] = 78
n[12 + 2] = 78
14n = 78
Divide both side by side 14
n = 78/14
n = 6
Molecular formula = ₙ[CH]
Molecular formula = ₆[CH]
Molecular formula = C₆H₆
Thus, the molecular formula of the compound is C₆H₆
Is there a phobia for chemical reactions specifically?
Answer:
chemonoia
Explanation:
Many people have a strong fear of “chemicals” that belies the evidence. It's called chemonoia – and it may be damaging their health. If you were paranoid, you might think there really was something in the water that's damaged our sense of reason.
HELP PLEASE!!!!!
An experiment calls for each student to use 3.50 g of sodium hydroxide.
There is only 78.2 g of sodium hydroxide remaining. How many students An experiment calls for each student to use 3.50 g of sodium hydroxide.
There is only 78.2 g of sodium hydroxide remaining. How many students
can complete the experiment?
Select one:
a. 22 students
b. 0 students
c. 78 students
d. 273 students
Answer:
22 students
Explanation:
i just answered it for a quiz and its correct
Please help. I'll give brainliest :)
Which answer describes a type of chemical weathering?
A. ice freezing in rock crevices
B. tafoni from salt crystallization
C. water changes rock crystals into hydrates
D. moving water over rock
Answer:
The answer is c, i just got it right on my test
Explanation:
stay safe!
balance these equations
Answer:
2 Pb(NO3)2 = 2 PbO + 4 NO2 + O2
2 KNO3 = 2 KNO2 + O2
4 Al + 3 O2 = 2 Al2O3
60KI + 3H20 + 40O3 → 60KOH + 30I2 + 30O2
2 FeCl3 + SO2 + 2 H2O = 2 FeCl2 + 2 HCl + H2SO4
Check if its right
Explanation:
2Pb(NO3)2=2PbO+4NO2+ O2
4KNO3=4KNO2+2O2
8AL+6O2=4AL2O3...
I tried ....
what is dilution?..............
Answer:
di·lu·tion
the action of making a liquid more dilute.
"the milk factor is greatly reduced by dilution"
geologists classify sedimentary rocks as either clastic chemical or organic
Answer:
both. yes
Explanation:
Name the Compound CS4
Monocarbon tetrasulfide
Monocarbon sulfide
Carbon tetrasulfide
Carbon sulfide
Answer:
Monocarbon tetrasulfide
Explanation:
Name of compound is mono carbon tetrasulfide.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
Learn more about compounds ,here:
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What is the percent yield of a reaction?
a.the difference between measured and calculated amounts
b.the amount of product obtained / amount possible x100
c. The amount of product actually obtained in a reaction
d. The amount of product that is possible from a reaction
Answer:
B
Explanation:
A P E X
The amount of product obtained / amount possible x100. Hence, option B is correct.
What is the per cent yield of a reaction?To express the efficiency of a reaction, calculate the per cent yield using this formula:
%yield = (actual yield/theoretical yield) x 100.
A per cent yield of 90% means the reaction was 90% efficient, and 10% of the materials were failed and not in use.
Hence, option B is correct.
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What else is produced during the combustion of butane C4H10?
2C4H10 + 130,2 --> 8______ + 10H2O
What is the chemical name of the fruit orange
Answer:
The chemical name is C16H11N2NaO4S
Explanation:
The equation for the synthesis of ammonia is below. How many moles of H 2 are
needed to produce 9.33 moles of NH3?
EQUATION: N2 + H2 = NH3
Answer:
Using the proportions of the amount of the molecules, we can convert from any reagent or product to any other reagent or product. In the context of this reaction, for every mole of N2 and every 3 moles of H2 we obtain 2 moles of NH3.
Explanation:
Hydrogen is the limiting reactant. In other words, Hydrogen will run out before Nitrogen because it takes 3 mole of H2 and just 1 mole of N2 to make 2 mole NH3. What is the greatest amount of MgO (in moles) that can be made with 7.8 moles of Mg and 4.7 moles of
The glancing angle (θ) of a Bragg reflection (n = 1) from a set of crystal planes separated by 99.3 pm is 10.42°. Calculate the wavelength of the X-rays that is used.
Answer:
wavelength λ = 35.92 pm
Explanation:
Given that:
The glancing angle (θ) = 10.42°
Bragg reflection n = 1
wavelength λ = ???
diameter d = 99.3 pm
Using the formula:
nλ = 2dsinθ
we have:
1 × λ = 2 × ( 99.3) × sin (10.42°)
λ = 198.6 × 0.18086
λ = 35.92 pm
The wavelength of the X-rays that is used is equal to 35.9 nanometers.
Given the following data:
Bragg reflection, n = 1Glancing angle (θ) = 10.42°.Distance between planes = 99.3 picometers.To calculate the wavelength of the X-rays that is used, we would apply Bragg's law of reflection:
Mathematically, Bragg's law of reflection is given by the formula:
[tex]n\lambda = 2dsin\theta[/tex]
Where:
n is Bragg reflection.d is the distance between crystal planes.[tex]\lambda[/tex] is the wavelength.[tex]\theta[/tex] is the reflection angle.Substituting the given parameters into the formula, we have;
[tex]1 \times \lambda = 2 \times 99.3 \times 10^{-11} \times sin(10.42)\\\\ \lambda = 1.99 \times 10^{-9} \times 0.1809\\\\\lambda = 3.59 \times 10^{-10}[/tex]
Wavelength = 35.9 nanometers.
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How does a ligand bind to the proper receptor?
Answer:
The ligand crosses the plasma membrane and binds to the receptor in the cytoplasm.
Answer:
The receptor then moves to the nucleus, where it binds DNA to regulate transcription.
Can someone help with question 6 ASAP
Answer:
A metalloid is a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. There is no standard definition of a metalloid and no complete agreement on which elements are metalloids. Despite the lack of specificity, the term remains in use in the literature of chemistry.
A series of six elements called the metalloids separate the metals from the nonmetals in the periodic table. The metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. These elements look metallic; however, they do not conduct electricity as well as metals so they are semiconductors. They are semiconductors because their electrons are more tightly bound to their nuclei than are those of metallic conductors. Their chemical behavior falls between that of metals and nonmetals. For example, the pure metalloids form covalent crystals like the nonmetals, but like the metals, they generally do not form monatomic anions. This intermediate behavior is in part due to their intermediate electronegativity values. In this section, we will briefly discuss the chemical behavior of metalloids and deal with two of these elements—boron and silicon—in more detail.
Explanation:
i hope this helps you :)
write the formula of cryolite .
Answer:
[tex]Na_{3} AlF_{6}[/tex]
1. Which scenario best describes Newton's 1st law?
Answer:
option B . because acording to Newton 1st law until or unless you donot apply force the object will not move or stops.
Explanation:
Which of the following is true about the reactions shown below?
C5H12 + 8 02 --> 5 CO2 + 6 H20 *
(1 Point)
O 9 moles of reactants chemically change into 11 moles of product
9 liters of reactants chemically change into 11 liters of product
9 atoms of reactants chemically change into 11 atoms of products
9 grams of reactants chemically change into 11 grams of products
the answer to this equation is " double replacement "
hopefully i helped
Answer:
9 moles of reactants chemically change into 11 moles of product
Explanation:
A sample of metal is heated until it melts and begins to glow red. When it cools, it appears the same color as it did before it was heated. This is evidence that a chemical reaction occurred. is it true or false
Answer:
Explanation:
trueeeeeeeeeeeeeeeeeeeeeeeeeee
162.4 NH3 =____mol NH3
Answer:
162.4
Explanation:
Because yea thats the answer no need to tell you why ok bye
What is the strength of Ammonium lauryl sulfate?
Answer:
283.43 g/mol
Explanation:
hey i got a question for science its " you throw a rock with a mass of 3.6 kg. the ball leaves your hand with a speed of 10 m/s DO NOT INCLUDE J IN THE ANSWER
it is 3.9 i know tgis because you throw a rock with a mass of 3.6 kg. the ball leaves your hand with a speed of 10
Please helppp
Which of the following trends is decreasing as you move from left to right across this portion of the Periodic Table?
Atomic number
Metallic character (becoming less metal like)
Number of atomic orbitals
Number of valence electrons
Answer:
Metallic character (becoming less metal like)
Explanation:
I took the test
1. Explain why BCl3 monomer but BH3 exist as B2H6.
Answer:
See explanation
Explanation:
Both BCl3 and BH3 are electron deficient compounds. In these compounds, boron has six instead of eight electrons surrounding it's outermost shell.
BH3 is able to form a dimmer because of the small size of hydrogen atoms which enable them to be fitted between boron atoms. Large size chlorine atoms can not be fitted between boron atoms hence B2Cl6 does not exist.
When you dissolve an antacid tablet in water and it produces bubbles, what kind of change is this?
A. a physical change
B. a chemical change
C. a solution change
Answer: B. a chemical change
Explanation:
How much heat will a 45.00 g piece of glass require to change its temperature from 10 to 30 °C. The specific heat capacity is 0.500 J/g°C.
675 J
225 J
450 J
700 J
Answer:
Q = 450 J
Explanation:
Given that,
Mass of a piece of glass, m = 45 g
The temperature changes from 10°C to 30°C.
The specific heat is 0.5 J/g°C
We need to find heat required to raise the temperature. The formula that is used to find it is given by :
[tex]Q=mc\Delta T\\\\Q=45\times 0.5\times (30-10)\\\\Q=450\ J[/tex]
So, the required heat is 450 J. Hence, the correct option is (c).
What is an atom? Is it stable? Give reasons to support your answer.
What is the volume of 45g of benzene, C6H6 at 100°C and 250 Torr?
Answer:
V = 53.82 L
Explanation:
Given data:
Mass of benzene = 45 g
Temperature = 100°C (100+273 = 373 K)
Pressure = 250 torr (250/760 = 0.33 atm)
Volume of benzene = ?
Solution:
Number of moles of benzene:
Number of moles = mass /molar mass
Number of moles = 45 g/ 78.11 g/mol
Number of moles = 0.58 mol
Volume of benzene:
PV = nRT
V = nRT/P
V = 0.58 mol × 0.0821 atm.L/mol.K × 373 k / 0.33 atm
V = 17.76 atm.L /0.33 atm
V = 53.82 L
Which of the following statements is NOT true about Olympus Mons?
It is 3 times as high as Mount Everest.
O Its base is about the same size as Arizona.
It is the largest mountain in the solar system.
It have never erupted.
Answer:
The largest of the volcanoes in the Tharsis Montes region, as well as all known volcanoes in the solar system, is Olympus Mons. Olympus Mons is a shield volcano 624 km (374 mi) in diameter (approximately the same size as the state of Arizona), 25 km (16 mi) high, and is rimmed by a 6 km (4 mi) high scarp.
Explanation: