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Answer:

laboratory preparation off Hydrogen: Hydrogen is prepared in the laboratory by the action of the dilute hydrochloric acid or dilute sulphuric acid on granulated zinc. Use of Granulated Zinc Granulated zinc contains an impurity like copper which acts as a positive catalyyst.

Explanation:

Hope this helps!

Answer:

E) +355 kJ

Explanation:

Based on Hess's law, it is possible to obtain ΔH of a reaction from the sum of similar reactions:

(1) IF(g) + F2(g) → IF3(g) ΔH = -390kJ

(2) IF(g) + 2F2(g) → IF5(g) ΔH = -745kJ

The sum of (1) - (2) is:

IF(g) + F2(g) → IF3(g)

IF5(g) → IF(g) + 2F2(g)

_________________

IF5(g) → IF3(g) + F2(g)

ΔH = -390kJ - (-745kJ)

ΔH = +355kJ

Right answer is:

Answer:

[tex][C_6H_{12}O_6][/tex]

Explanation:

Hello there!

In this case, since the concept of solution concentration is majorly used in terms of moles per liters of solution or molarity (M), it is also possible to represent this chemical unit by using squared brackets, [ ].

In such a way, when focused on the concentration of glucose, C6H12O6, we can use:

[tex][C_6H_{12}O_6][/tex]

Best regards!

Answer:

3

Explanation:

3 is the answer is did this a little while ago

Answer:

5.83 M

Explanation:

3.5 M * 125.0 ml  =  M₂ * 75.0ml

437.5 M.ml = M₂ * 75.0 ml

M₂ = 437.5 M.ml / 75.0 ml

M₂ = 5.83 M

Answer:

Check your toilet for leaks. ...

Stop using your toilet as an ashtray or wastebasket. ...

Put a plastic bottle in your toilet tank. ...

Take shorter showers. ...

Install water-saving shower heads or flow restrictors. ...

Take baths. ...

Turn off the water while brushing your teeth. ...

Turn off the water while shaving.

Explanation:

Answer:

keeping the water clean

Explanation:

avoid dumping rubish in the water

Answer:

607.9616 grams

Explanation:

Hope this helped!!

Answer:

1.05 atm

It should be 1 atm = 760 mm; therefore, 798 mm x (1 atm/760) = about 1.05 atm.

The value of pressure in atm that would be equal to 798 mmHg is 1.05 atmospheric.

Pressure is a physical quantity or a kind of force which is perpendicularly applied on the surface area of any object so that force is equally distributed on that surface.

Pressure will be maesured by various unit and have relation with one another.

As we know that, 1 atm = 760 mmHg

Or 1 mmHg = 1/760atm

Given quantity of pressure is 798 mmHg and we calculate this quantity by multiply this value by 1/760 and we get,

798 mmHg = 798mmHg × 1/760atm/mmHg = 1.05 atm

Hence required value of pressure is 1.05 atm.

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Answer:

0.092M

Explanation:

Molarity of glucose solution = number of moles ÷ volume

According to this question, 12.5g of glucose (C6H12O6) is dissolved in enough water to make 750mL of solution.

Molar mass of glucose (C6H12O6) = 12(6) + 1(12) + 16(6)

= 72 + 12 + 96

= 180g/mol

mole = mass/molar mass

mole = 12.5/180

mole = 0.069mol

Volume of solution = 750mL = 750/1000 = 0.750L

Hence, molarity = n/V

Molarity = 0.069 ÷ 0.750

Molarity = 0.092M

0.69(78)Explanation:

Explanation:

2 moles of lead oxide ->

2PbO2 -> 2PbO + O2

Answer: This is a typical acid/base equilibrium problem, that involves the use of logarithms.

Explanation:We assume that both nitric acid and hydrochloric acid dissociate to give stoichiometric

H

3

O

+

.

Moles of nitric acid:

26.0

×

10

−

3

⋅

L

×

8.00

⋅

m

o

l

⋅

L

−

1

=

0.208

⋅

m

o

l

H

N

O

3

(

a

q

)

.

And, moles of hydrochloric acid:

88.0

×

10

−

3

⋅

L

×

5.00

⋅

m

o

l

⋅

L

−

1

=

0.440

⋅

m

o

l

H

C

l

(

a

q

)

.

This molar quantity is diluted to

1.00

L

. Concentration in moles/Litre =

(

0.208

+

0.440

)

⋅

m

o

l

1

L

=

0.648

⋅

m

o

l

⋅

L

−

1

.

Now we know that water undergoes autoprotolysis:

H

2

O

(

l

)

⇌

H

+

+

O

H

−

. This is another equilibrium reaction, and the ion product

[

H

+

]

[

O

H

−

]

=

K

w

. This constant,

K

w

=

10

−

14

at

298

K

.

So

[

H

+

]

=

0.648

⋅

m

o

l

⋅

L

−

1

;

[

O

H

−

]

=

K

w

[

H

+

]

=

10

−

14

0.648

=

?

?

p

H

=

−

log

10

[

H

+

]

=

−

log

10

(

0.648

)

=

?

?

Alternatively, we know further that

p

H

+

p

O

H

=

14

. Once you have

p

H

,

p

O

H

is easy to find. Take the antilogarithm of this to get

[

O

H

−

]

.

Answer link  

Answer:

119.98 mL

Explanation:

Initial volume V1 = 123 ml

Initial temperature = T1 = 21◦C + 273 = 294 K

Initial pressure P1 = 760 Torr - 18.65 Torr = 741.35 Torr

Final volume V2= ???

Final temperature = T2= 21◦C + 273 = 294 K

Final pressure P2 = 760 Torr

From;

P1V1/T1= P2V2/T2

P1V1T2 = P2V2T1

V2 = P1V1T2/P2T1

V2= 741.35 * 123 * 294/760 * 294

V2 = 119.98 mL

The expected outcome of carrying out this step as planned is :

B. The resulting pH will be less than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.

The expected outcome of carrying out this step as planned is the resulting pH will be less than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.

pH may be a degree of how acidic/basic water is.

The run goes from - 14, with 7 being unbiased. pHs of less than 7 demonstrate causticity, while a pH of more noteworthy than 7 demonstrates a base.

pH is truly a degree of the relative amount of free hydrogen and hydroxyl particles within the water

Thus, the correct answer is B.

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Explanation:

(a) a functional group is a special group of atoms or bonds in a compound that is responsible for the chemical reactions, behavior, and characteristics of that compound. (b) Functional group is present in both the compound is alcohol (-OH).

Functional groups are specific groupings of atoms within molecules that have their own characteristic properties, regardless of the other atoms present in a molecule. Common examples are alcohols, amines, carboxylic acids, ketones, and ethers.

Key Points

Functional groups are often used to “functionalize” a compound, affording it different physical and chemical properties than it would have in its original form.

Functional groups will undergo the same type of reactions regardless of the compound of which they are a part; however, the presence of certain functional groups within close proximity can limit reactivity.

Functional groups can be used to distinguish similar compounds from each other.

Key Terms

functional group: A specific grouping of elements that is characteristic of a class of compounds, and determines some properties and reactions of that class.

functionalization: Addition of specific functional groups to afford the compound new, desirable properties.

Answer:

No

Explanation:

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

The matter which underwent a chemical change is not still the same substance as before.

This is the type of change which occurs when two substances known as reactants react to form a new product.

The formation of a new product through bonding and other parameters thereby makes the substance to be different as it was before.

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Answer:

B.) One oceanic plate converging with one continental plate.

HOPE THIS HELPS!

Answer:

C: Two tectonic plates transforming

Answer: The final temperature of the system will be [tex]13.14^0C[/tex]

Explanation:

[tex]heat_{absorbed}=heat_{released}[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex]         .................(1)

where,

q = heat absorbed or released

[tex]m_1[/tex] = mass of steam = 25 g

[tex]m_2[/tex] = mass of water = 0.2384 kg = 238.4 g   (1kg=1000g)

[tex]T_{final}[/tex] = final temperature = ?

[tex]T_1[/tex] = temperature of steam = [tex]116^oC[/tex]

[tex]T_2[/tex] = temperature of water = [tex]8^oC[/tex]

[tex]c_1[/tex] = specific heat of steam = [tex]1.996J/g^0C[/tex]

[tex]c_2[/tex] = specific heat of water= [tex]4.184J/g^0C[/tex]

Now put all the given values in equation (1), we get

[tex]25g\times 1.996J/g^0C\times (T_{final}-116)=-[238.4g\times 4.184J/g^0C\times (T_{final}-8)][/tex]

[tex]T_{final}=13.14^0C[/tex]

Therefore, the final temperature of the system will be [tex]13.14^0C[/tex]

Answer: it should be 80g

Explanation:

Answer:

Endothermic

Explanation:

An endothermic reaction is one in which energy is absorbed while an exothermic reaction is one in which energy is given out(evolved).

If we look at the reaction as written; 3C(graphite) + 3H2(g) + 88kcal -------> C3H8(g), we will notice that;

i) 88kcal of energy had to be absorbed for the reaction to occur

ii) The enthalpy change for the reaction is positive.

Since energy must be taken in to drive the forward reaction, then the reaction is endothermic as written.

Answer:

Answer:

1.44 g

Explanation:

The problem gives you the molarity and volume of the target solution, so right from the start you know that you can use that information to determine the number of moles of hydrochloric acid that it must contain.

So, molarity measures a solution's concentration in terms of how many moles of solute, which in your case is hydrochloric acid, you get per liter of solution.

A

0.158 M

hydrochloric acid solution contains

0.158

moles of hydrochloric acid for very liter of solution. Since you're dealing with

250 mL

, the equivalent of

1

4

th

of a liter, your solution will contain

250

mL

⋅

1

L

10

3

mL

⋅

0.158 moles HCl

1

L

=

0.0395 moles HCl

Now that you know how many moles of hydrochloric acid are needed to prepare your solution, use the compound's molar mass to convert this to grams

0.0395

moles HCl

⋅

36.46 g

1

mole HCl

=

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

1.44 g

a

a

∣

∣

−−−−−−−−−−

Explanation:

Please  brainliest.

Answer:

the heat wants to travel up. Heat rises

Explanation:

Answer:

B. Carry oxygen, nutrients, waste, & to fight pathogens

Explanation:

The circulatory system refers to all organs and tissues involved in carrying blood and lymph around the body.

The circulatory system carries oxygenated blood from the heart to cells and  deoxygenated blood back to the heart.

Nutrients are carried in the blood to cells in different parts of the body and waste products are also carried from cells in the blood.

White blood cells is a component of blood in the circulatory system that fights off diseases.

yes use the masses of an element below calculate the mass of it 8.70 mole of each 3M

Answer:

balanced equation mole ratio 5 2 mol NO/1 mol O2

10.00 g O2 3 1 mol O2/32.00 g O2 5 0.3125 mol O2

20.00 g NO 3 1 mol NO/30.01 g NO 5 0.6664 mol NO

actual mole ratio 5 0.6664 mol NO/0.3125 mol O2 5 2.132 mol NO/1.000 mol O2

Because the actual mole ratio of NO:O2 is larger than the balanced equation mole

ratio of NO:O2, there is an excess of NO; O2 is the limiting reactant.

Mass of NO used 5 0.3125 mol O2 3 2 mol NO/1 mol O2 5 0.6250 mol NO

0.6250 mol NO 3 30.01 g NO/1 mol NO 5 18.76 g NO

Mass of NO2 produced 5 0.6250 mol NO2 3 46.01 g NO2/1 mol NO2 5 28.76 g NO2

Excess NO 5 20.00 g NO 2 18.76 g NO 5 1.24 g N

Explanation:

Answer:

Percent composition  by mulecules is:  (mass of element/molecular mass) x 100

Percent composition by atoms is: (mass of element/molecular mass) x 100.

Explanation:

So their the same

Answer: 16.0 g

Explanation: M(NaOH) = 39.998 g/mol. N = m/M = cV

Mass m = McV = 39.998 g/mol·0.200 mol/l · 2.0 l = 16.0 g

Answer:

lets say your doing a frog

it jumps it speeds up and then slows down

Explanation: