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zmey [24]
2 years ago
11

Which option describes energy being released as heat?

Chemistry
2 answers:
Mnenie [13.5K]2 years ago
8 0

Answer:

I’m pretty sure it’s Lions sleeping after a big meal

Explanation:

alex41 [277]2 years ago
4 0

Answer: C. A child shivering in the cold

Explanation:

Did the test. :)

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Vinegar is a solution of acetic acid (the solute) in water (the solvent) with a solution density of 1010 g/L. If vinegar is 0.80
Damm [24]

Answer:

4.8 %

Explanation:

We are asked the concentration in % by mass, given the molarity of the solution and its density.

0.8 molar solution means that we have 0.80 moles of acetic acid in 1 liter of solution. If we convert the moles of acetic acid to grams, and the 1 liter solution to grams, since we are given the density of solution, we will have the values necessary to calculate the % by mass:

MW acetic acid = 60.0 g/mol

mass acetic acid (the solute) = 0.80 mol x 60 g / mol = 48.00 g

mass of solution = 1000 cm³ x 1.010 g/ cm³      (1l= 1000 cm³)

                            = 1010 g

% (by mass) = 48.00 g/ 1010 g  x 100 = 4.8 %

6 0
2 years ago
Identify the following redox reactions by type. Check all that apply. (a) Fe + H2SO4 → FeSO4 + H2 combination decomposition disp
EastWind [94]

Answer :

(a) displacement reaction

(b) combination reaction

(c) disproportionation reaction

(d) displacement reaction

Explanation :

(a) The given balanced chemical reaction is,

Fe+H_2SO_4\rightarrow FeSO_4+H_2

This reaction is a single replacement reaction or displacement in which the the more reactive element (Fe) replace the less reactive element (H).

(b) The given balanced chemical reaction is,

S+3F_2\rightarrow SF_6

This reaction is a combination reaction in which the two reactants molecule combine to form a large molecule or single product.

(c) The given balanced chemical reaction is,

2CuCl_2\rightarrow Cu+CuCl_2

This reaction is a disproportionation reaction in which the chemical species gets oxidized and reduced simultaneously.  It is also considered as a redox reaction.

(d) The given balanced chemical reaction is,

2Ag+PtCl_2\rightarrow 2AgCl+Pt

This reaction is a single replacement reaction or displacement in which the the more reactive element (Ag) replace the less reactive element (Pt).

7 0
2 years ago
1. Copper (__) is an element on the periodic table.
user100 [1]

Answer:  Cu

Explanation: It is Cu because the origin of the word Copper comes from the latin word "Cuprum".

3 0
2 years ago
A 251 g strip of glass wool is used to insulate a reaction flask. During the reaction the temperature of the glass wool increase
Ivahew [28]

Answer:

8.9 KJ

Explanation:

Given data:

Mass of strip = 251 g

Initial temperature = 22.8 °C

Final temperature = 75.9 °C

Specific heat  capacity of granite = 0.67 j/g.°C

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 75.9 °C - 22.8 °C

ΔT = 53.1 °C

Q = 251 g × 0.67 j/g.°C × 53.1 °C

Q = 8929.8 J

Jolue to KJ.

8929.8J ×1 KJ / 1000 J

8.9 KJ

8 0
2 years ago
A food product is being frozen in a system capable of removing 6000 kJ of thermal energy. The product has a specifi c heat of 4
lapo4ka [179]

Answer : The exit temperature of the product is, -35.2^oC

Explanation :

Total heat = Heat lost by liquid + Latent heat of fusion + Heat lost by frozen

Q=m\times c_1\times (T_2-T_1)+m\times L_f+m\times c_2\times (T_4-T_3)

where,

Q =  Total heat = 6000 kJ

m = mass of product = 15 kg

c_1 = specific heat of liquid = 4kJ/kg^oC

L_f = latent heat of fusion = 275kJ/kg

c_2 = specific heat of frozen = 2.5kJ/kg^oC

T_1 = initial temperature of liquid = 2^oC

T_2 = final temperature of liquid = 10^oC

T_3 = initial temperature of frozen = ?

T_4 = final temperature of frozen = 2^oC

Now put all the given value in the above expression, we get:

6000kJ=[15kg\times 4kJ/kg^oC\times (10-2)^oC]+[15kg\times 275kJ/kg]+[15kg\times 2.5kJ/kg^oC\times (2-T_3)^oC]

T_3=-35.2^oC

Thus, the exit temperature of the product is, -35.2^oC

7 0
2 years ago
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