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3 years ago

Describe four ways you could increase the rate of a chemical reaction.

2 answers:

3 0

1. Increase the temperature
2. Increase the pressure of an reacting gas
3. Solid reactants are broken into smaller pieces
4. The concentration of a dissolved reactant is increased. <span />

KatRina [158]3 years ago

3 0

1. Increase the temperature

2. Increase the pressure of an reacting gas

3. Solid reactants are broken into smaller pieces

4. The concentration of a dissolved reactant is increased.

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You have 627 ml of 5.04 M HCl. Using a volumetric pipet, you take 229 ml of that solution and dilute it to 921 ml in a volumetri

trasher [3.6K]

Answer:

0.653

Explanation:

M1V1 = M2V2

M1 = 5.04 M

V1 = 229 mL ( you take only this volume)

V2 = 921 mL

5.04*229 = M2 * 921

M2 = (5.04*229)/921 Molarity

M1V1 = M2V2

M1 = (5.04*229)/921

V1 = 100 mL

V2= 192 mL

(5.04*229)/921 *100 = M2 * 192

M2 = [(5.04*229)/921 *100]/192 = 0.653 final molarity

8 0

3 years ago

Gold forms a substitutional solid solution with silver. Calculate the number of gold atoms per cubic centimeter (in atoms/cm3) f

Leokris [45]

Answer:

Gold: 1.1 x 10²² atoms/cm³

Silver: 4.8 x 10²² atoms/cm³

Explanation:

100 g of the alloy will have 29 g of Au and 71 g of Ag.

19.32 g Au ____ 1 cm³

29 g Au ______ x

x = 1.5 cm³

10.49 g Ag ____ 1 cm³

71 g Ag _______ y

y = 6.8 cm³

The total volume of 100g of the alloy is x+y = 8.3 cm³.

Gold:

196.97 g Au____ 6.022 x 10²³ atoms Au

29 g Au _______ w

w = 8.9 x 10²² atoms Au

8.9 x 10²² atoms Au ____ 8.3 cm³

A ____ 1 cm³

A = 1.1 x 10²² atoms Au

Silver:

107.87 g Ag____ 6.022 x 10²³ atoms Ag

71 g Ag _______ w

w = 4.0 x 10²³ atoms Ag

4.0 x 10²³ atoms Ag ____ 8.3 cm³

B ____ 1 cm³

B = 4.8 x 10²² atoms Ag

6 0

3 years ago

Lithium carbonate, li2co3, contains 18.8 % lithium and is used in the treatment of mental illnesses such as bipolar disorder. wh

Rama09 [41]

Assuming that the 18.8% composition is based on mass, therefore the mass of Lithium would simply be the product of the fractional composition and the total dose. That is:

18.8 % = 0.188

mass Lithium = 0.188 * 1.00 g = 0.188 g

Answer:

7 0

3 years ago

Which property is typical of a covalent compound?

Anestetic [448]

Answer: the correct option is (C).

Explanation:

Covalent compounds have lower melting and boiling points due to presence of weak inter-molecular forces by which molecules are weakly associated to each other. Hence, melting and boiling of covalent compounds occurs at low temperatures.

Usually, Covalents compounds have following properties:

They are brittle solids
They do not conduct electricity
They do not have rigid crystal structure.
They exist in all states: solids, liquids and gases.

5 0

4 years ago

Read 2 more answers

An air-filled balloon has a volume of 225 L at 0.940 atm and 25 °C. Soon after, the pressure changes to 0.990 atm and the temper

lorasvet [3.4K]

Answer:

The right choice is V₂ = 195.7 L

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V: is the volume of the gas in L.

n: is the no. of moles of the gas in mol.

R: is the general gas constant,

T: is the temperature of the gas in K.

If n is constant, and have different values of P, V and T:

(P₁*V₁) / T₁ = (P₂ * V₂) / T₂

Knowing that:

V₁ = 225 L , P₁ = 0.940 atm

T₁ = 25 °C + 273 = 298 K

V₂ = ??? L, P₂ = 0.990 atm

T₂ = 0 °C + 273 = 273 K

applying in the above equation

(P ₁* V₁) / T₁ = (P₂ * V₂) / T₂

(0.940 atm * 225 L) / 298 K= (0.990 atm * V₂) / 273 K

V₂ = (0.940 atm * 225 L * 273 K) / (298 K * 0.990 atm)

V₂ = 195.7 L

So, the right choice is:

V₂ = 195.7 L

7 0

3 years ago