Answer:
There are 4.517x10^23 atoms of Zn in 0.750 mols of Zn
Explanation:
Determine the block of the element Iron which has 26 atomic number:
Answer:
ok
Explanation:
Answer:
Iron
Explanation:
PLS HELPPPP OMG PLSPLSPLSPLSPLS
Answer:
D 44.8 L liters of hydrogen gas
An example of an abiotic factor that would strongly affect the population of water lilies in a pond?
Answer:
temperature, light or pH
Explanation:
What state does a maple tree enter during the winter?
A. thigmotropism
B. migration
C. hydrotropism
D. dormancy
Water can exist in all three states of matter.
Describe the arrangement and movement of particles in each of the three states of matter. Explain what happens to the particles in a liquid during boiling.
I'll give someone brainly and thanks if they answered the question correctly. 30 points!!
Answer:
The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas
In experiment B, the iron filings weighed 2.0 g at the beginning of the experiment and the iron sulfide produced weighed 2.8 g. Explain this increase in mass
Answer:
The increase in mass is because the iron fillings have combined with a sulfide to produce iron sulfide and so the mass will increase.
In such a reaction like this, the mass of the reactants must be conserved. By so doing, the mass of reactants and products must be the same.
When two substances combine together, their masses added up to that of the individual masses. This helps to conserve the mass.
Explanation:
The increase in mass is because the iron fillings have combined with a sulfide to produce iron sulfide and so the mass will increase.
In such a reaction like this, the mass of the reactants must be conserved. By so doing, the mass of reactants and products must be the same.
When two substances combine together, their masses added up to that of the individual masses. This helps to conserve the mass.
A face centered cubic cell has an edge length of 495 pm. What is that atomic radius?
Answer:
r = ¼a√2
Explanation:
For a face centered cubic cell, which we call FCC, the atoms at the face diagonals touch each other.
Now, If we denote the edge length of cube to be "a" and the radius of the atom is denoted as "r", as seen in the attached FCC cell:
(√2)a = 4r
Divide both sides by 4 to get;
r = ¼a√2
To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is
Answer:
78.04g of 0.448 moles must be added
Explanation:
Using H-H equation we can find the pH of the buffer:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer = 7.2
pKa = 7.1
[A⁻] = [K₂HPO₄]
[HA] = [KH₂PO₄]
Replacing:
7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]
0.1 = log [K₂HPO₄] / [KH₂PO₄]
1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)
And as the concentration of the buffer is:
1M = [K₂HPO₄] + [KH₂PO₄] (2)
Replacing (2) in (1):
1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]
1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]
2.2589 [KH₂PO₄] = 1M
[KH₂PO₄] = 0.44M
And [K₂HPO₄] = 0.56M
In 800mL = 0.8L:
0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:
0.448 moles * (174.2g / mol) =
78.04g of 0.448 moles must be addedWhat is the relationship
between the pancreas, the
stomach, and the
esophagus?
They are all part of the
circulatory system.
They are all part of
the nervous system.
They are all part of
the digestive system.
D
They are all part of the
respiratory system.
Type here to search
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10:40 AM
2/11/2021
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Answer:
The stomach, gallbladder, and pancreas work together as a team to perform the majority of the digestion of food. Food entering the stomach from the esophagus has been minimally processed — it has been physically digested by chewing and moistened by saliva, but is chemically almost identical to unchewed food
What is the difference between endothermic and exothermic reaction (shortest answer)
Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An ethothermic process absorbs heat and cools the surroundings. Hope this helped.
The easiest way to explain endo and exothermic reactions are that endothermic reactions absorb energy and exothermic reactions release energy.
The way I remember this is that with exothermic reactions, the heat exits. Endothermic is just the opposite.
Hope this helps :)
Calculate and give the answer with the correct number of significant
figures.
3.256 / 2.7
3.256 × 10
__________
2.7 × 10
32.56
____
27
= 1.2059259259
Gravity is responsible for the
Orbiting path of the panets around the sun.
Rotation of a planet on its rotation axis.
Tilt of Earth's axis.
Pheses of the moon.
Which state of matter has the most movement of its particles?
Answer:
solids...............
please help, I'm lost
How many grams of gasoline were
burned if 1.63 x 1023 molecules of
water were produced? Only report
number (no units) and use correct sig
figs.
Answer:
31.0 g C8H18
Explanation:
Gasoline is equivalent to C8H18
to convert molecule to gram you have to convert molecules to mols first.
Using Avocado's number we can figure that out.
(1.63 x 10²³ molecules C8H18) (1 mol C8H18/ 6.022 x 10²³) = 0.271 mols C8H18
Then we convert mols to grams using the molar mass of C8H18
C - 8(12.011) = 96.088 g/mol
H - 18(1.008) = 18.144 g/mol
add that together: 114.232 g/mol
(0.271 mol C8H18) (114.232 g/ 1 mol C8H18) = 31.0 g
31.0 g C8H18
P.S: SORRY IF THIS DOESNT HELP!! I dont know if they are talking about the actual formula for gasoline.
Pb(NO3)2
how do i solve this
You can see the periodic table one by one.
Pb(NO3)2 = PbN2O6
So there are
1Pb
2N
6O
and so you find the molecular mass from the periodic table and add all the numbers
Molacular mass of
Pb = 207
N = 14
O = 16
multiply it with the number of atoms
1Pb = 207 × 1 = 207
2N = 14 × 2 = 28
6O = 16 × 6 = 96
Molecular mass total = 207 + 28 + 96 = 331
So the molecular mass is 331.
A prescription is written for 500 mL of a 7% NaCl solution. The technician has a 50% NaCl solution. What volume of
50% NaCl is required for the 7% solution?
mL
Answer:
70 mL
Explanation:
To solve this problem we can use the C₁V₁=C₂V₂ equation, where the subscript 1 refers to the concentrated solution while subscript 2 refers to the diluted one, as follows:
C₁ = 50V₁ = ?C₂ = 7V₂ = 500 mLWe input the data:
50 * x = 7 * 500 mLAnd solve for x:
x = 70 mLThus the answer is 70 mL.
Alkaline solutions have pH values below 7.
true or false ?
Answer:
It is false
Explanation:
ph value below 7 are acidic, and ph values above 7 are alkaline (basic)
advantages of solar energy
can someone please help!? i’ll mark you as brainliest
Answer:
26
Explanation:
Answer:
Reactants: NaBr and CA(OH)2
Products: CaBr and NaOH
Explanation:
Reactants are always on th left side of the equation and products on the right side
What is the name for Mo(PO3)2
Copper(II) Phosphite is the IUPAC name of the given compound. Ionic compounds don't get prefixes like di-, tri- etc.
International Union of Applied and Pure Chemistry is referred to as IUPAC. The IUPAC establishes the standards for the atomic weights that are shown on the periodic table and is the acknowledged authority for chemical nomenclature, measurements, including atomic mass values. Although IUPAC produces publications in many scientific domains, including physics, biology, and chemistry, it is most recognised for its work standardising nomenclature in the chemical sector. Standardising code names for nucleotide base sequences is one of the significant things the IUPAC has achieved in these areas. Copper(II) Phosphite is the IUPAC name of the given compound.
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How many molecules are in 83.2 g of chlorine gas (Cl2)?
Group of answer choices
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Answer:
try all of them
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Explanation:
A 367.8 g sample of potassium chlorate was decomposed according to the following equation:
2KClO3 -->2KCl + 3O2 How many moles of oxygen are formed?
a 2.5 mol
b 4.5 mol
c 1.0 mol
d 3.0 mol
What is the equation and molecular weight of Scandium (II) Sulfite? Not sulfide
Explanation:
Molecular Formula
S3Sc2
Synonyms
Scandium sulfide
Scandium sulfide (Sc2S3)
Discandium trisulphide
Molecular Weight
186.1 g/mol
A certain compound has an empirical formula of CH3. What must be true about this compound?
Answer:
A.
It contains three times as many hydrogen atoms as carbon atoms.
B.
It consists of 75% hydrogen by mass.
C.
Each molecule contains exactly four atoms.
D.
Each carbon atom is bonded to three hydrogen atoms.
Explanation:
it has 75% Hydrogen by mass
If we assume CH3 as 100% which is 4 parts.
Then 3 parts corresponds to Hydrogen which is 75% and remains is carbon,25 %
Silver nitrate, AgNO3, is which type of matter?
A. Element B. Compound C. Heterogeneous mixture D. Homogeneous mixture
Silver nitrate, AgNO₃ is a compound which is a type of matter as it is made up of more than one type of element.
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.
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Gold has a specific heat of 0.129 J/g °C. How many joules of heat energy are
required to raise the temperature of 23 grams of gold from 22 °C to 98
°C?
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
210.657J
Explanation:
joules of heat energy needed= 23×0.129×(93-22)
=210.657J
1.52 moles of gas are at a pressure of 99.5kPa and a temperature of 298K. What is the volume of the gas
Answer:
5
Explanation:
answer my last question plz
In addition to the two types of motion found in liquids, gases have
What kind of motion
Answer:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
2. (10 Points) Several fast-acting medications are sold as powders, sometimes
inside soluble capsules. Why would these medications act faster than solid
tablets?
The medications like capsules act faster because of their increased surface area which helps them to absorb quickly.
What is a capsule?Encapsulation in the manufacture of pharmaceuticals refers to a range of dosage form techniques that are used to enclose medicine in a relatively stable shell called a capsule.
The two main types of capsules are Hard-shelled capsules and Soft-shelled capsules. Hard-shelled capsules contain dry, powdered ingredients made by processes such as extrusion, and spheronization.
Soft-shelled capsules are primarily used for oils and for active ingredients that are dissolved in oil. Both types of capsules are made from aqueous solutions of gelling agents, such as animal protein or plant polysaccharides.
The size of particles and the additive properties affect the rate of the dissolution or absorption of the drug. As the surface area of the capsule is greater than the solid tablets so they absorb faster than tablets.
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