Arrange the following atoms in order of decreasing atomic radius

3.256 × 10

__________

2.7 × 10

32.56

____

27

= 1.2059259259

Answer:

it's D) catalyst speed up chemical reaction by increasing surface area

Explanation:

sorry if I'm wrong

Explanation:

to see how a change in a reactant concentration would affect the speed of the chemical reaction

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 :)

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.

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) =

Answer:

It is false

Explanation:

ph value below 7 are acidic, and ph values above 7 are alkaline (basic)

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:

We input the data:

And solve for x:

Thus the answer is 70 mL.

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.

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

Explanation:

Molecular Formula

S3Sc2

Synonyms

Scandium sulfide

Scandium sulfide (Sc2S3)

Discandium trisulphide

Molecular Weight

186.1 g/mol

Silver nitrate, AgNO₃ is a compound which is a type of matter as it is made up of  more than one type of element.

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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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:

Answer:

The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas

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 %

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

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.

Answer:

temperature, light or pH

Explanation:

Answer:

210.657J

Explanation:

joules of heat energy needed= 23×0.129×(93-22)

=210.657J

Answer:

5

Explanation:

answer my last question plz

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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Answer:

D 44.8 L liters of hydrogen gas

The medications like capsules act faster because of their increased surface area which helps them to absorb quickly.

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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Answer:

solids...............

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