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devlian [24]
3 years ago
11

Is a faded picture a chemical or physical change?

Chemistry
2 answers:
sweet-ann [11.9K]3 years ago
7 0
QUIMIC. (Química) :)
nalin [4]3 years ago
5 0
It is a chemical change
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What effects can occur when heat energy is added to a system? Select all that apply. a. increase in temperature
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<span>a. increase in temperature 
</span><span>d. phase change

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3 years ago
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A beaker contains 175.32g of salt, NaCl(58.44g/mol). Water is added until the final volume is 2 liters. The solution should be d
cricket20 [7]

Answer:

E. 1.5M

Explanation:

because there is total 175.32 g of NaCl dissolved in 2 liter of water, and 58.44 g = 1 mol

so total miles = 175.32/58.32 = 3 moles

now 3 moles are in 2 liter of water, hence one liter contains 3/2= 1.5

Therefore answer is E. 1.5M

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3 years ago
What is the mass of a wooden block with a density 2.0 and a volume of 7.0? (Need answer ASAP!!)
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Answer:

mass= 14kg

Explanation:

density= mass/volume

so that means mass= volume x density

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5 0
4 years ago
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Consider the intermediate chemical reactions. 2 equations. First: upper C a (s) plus upper C upper O subscript 2 (g) plus one ha
DochEvi [55]

<u>Answer:</u> When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

<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 overall chemical reaction follows:

CaO(s)+CO_2\rightarrow CaCO_3(s)     \Delta H^o_{rxn}=?

The intermediate balanced chemical reaction are:

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(2) 2Ca(s)+O_2(g)\rightarrow 2CaO(s)     \Delta H_2=-1269kJ

The expression for enthalpy of the reaction follows:

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

Hence, when the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

3 0
3 years ago
Which determines the frequency of a sound wave? A the intensity of the sound waves B the rate at which the sound source is vibra
andreyandreev [35.5K]

Answer:

b

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The number of vibrations per second is known as the frequency

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