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WITCHER [35]
3 years ago
7

What's the definition if blood

Chemistry
1 answer:
ANEK [815]3 years ago
8 0
Blood is a liquid substance flowing through the arteries and veins of the body. In a healthy normal person, approximately 45% of their blood volume are cells (mostly red blood cells, white blood cells and platelets).

hope this helps!
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Identify each of the following energy exchanges as primarily heat or work and determine whether the sign of ΔE is positive or ne
spayn [35]

Answer:

ΔE negative,ΔE positive,ΔE positive

Explanation:

Internal energy change of a system is positive when the system acquires energy from outside and internal energy change is negative when energy is being liberated from the system.

a Sweat evaporates from skin,cooling the skin ΔE is negative as heat energy is liberated through evaporation of sweat.

b A balloon expand against an external pressure ΔE  positive because external energy is required to expand the balloon.

c An aqueous chemical reaction mixture is warmed with an external flame ΔE is positive because heat energy is provided by the external flame to warm the aqueous chemical reaction.

7 0
3 years ago
Is a leaf a solid,liquid or gas?​
Virty [35]

Answer:solid

Explanation:

6 0
3 years ago
Read 2 more answers
Given thatH2(g) + F2(g) -> 2HF(g) => ∆H = -546.6 kJ . mol-12H2(g) + O2(g) -> 2H20(l) => ∆H = -571.6 kJ. mol-1
Fantom [35]

<u>Answer:</u> The \Delta H^o_{rxn} for the reaction is -521.6 kJ.

<u>Explanation:</u>

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The chemical equation for the reaction of fluorine and water follows:

2F_2(g)+2H_2O(l)\rightarrow 4HF(g)+O_2(g)   \Delta H^o_{rxn}=?

The intermediate balanced chemical reaction are:

(1) H_2(g)+F_2(g)\rightarrow 2HF(g)    \Delta H_1=-546.6kJ    ( × 2)

(2) H_2(g)+O_2(g)\rightarrow 2H_2O(g)    \Delta H_2=-571.6kJ

The expression for enthalpy of reaction follows:

\Delta H^o_{rxn}=[2\times \Delta H_1]+[1\times (-\Delta H_2)]

Putting values in above equation, we get:

\Delta H^o_{rxn}=[(2\times (-546.6))+(1\times (571.6))]=-521.6kJ

Hence, the \Delta H^o_{rxn} for the reaction is -521.6 kJ.

8 0
3 years ago
A 25.0 g piece of aluminum (which has a molar heat capacity of 24.03 J/mol°C) is heated to 86.4°C and dropped into a calorimeter
Ira Lisetskai [31]

Answer:

m H2O = 56 g

Explanation:

  • Q = mCΔT

∴ The heat ceded (-) by the Aluminum part is equal to the heat received (+) by the water:

⇒ - (mCΔT)Al = (mCΔT)H2O

∴ m Al = 25.0 g

∴ Mw Al = 26.981 g/mol

⇒ n Al = (25.0g)×(mol/26.981gAl) = 0.927 mol Al

⇒ Q Al = - (0.927 mol)(24.03 J/mol°C)(26.8 - 86.4)°C

⇒ Q Al = 1327.64 J

∴ mH2O = Q Al / ( C×ΔT) = 1327.64 J / (4.18 J/g.°C)(26.8 - 21.1)°C

⇒ mH2O = 55.722 g ≅ 56 g

5 0
3 years ago
Bob just filled his car's gas tank with 20 gallons of gasohol, a mixture consisting of 5% ethanol and 95% gasoline. If his car r
WARRIOR [948]

Answer:

C. 10/9 gallons

Explanation:

Given that

V= 20 gallons

Volume of ethanol = 5% of V = 0.05 x 20 = 1 gallons

Volume of the gasoline = 95 % of V = 19 gallons

Lets take x gallons of ethanol is added to achieve optimum performance.

(1+x)/(20+x) = 10 %

(1+x)/(20+x) =0.1

1+ x = 0.1 ( 20+ x)

1+ x = 2 + 0.1 x

1 = 0.9 x

x= 10 /9  gallons

So the option C is correct.

C. 10/9 gallons

5 0
3 years ago
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