3 years ago

Which of the following always changes when a substance undergoes a chemical change?

Chemistry

2 answers:

Ronch [10]3 years ago

8 0

Answer:

Explanation:

All chemical reactions will show a change in color.

Elenna [48]3 years ago

7 0

Answer:

C. Color of the substance.

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3 years ago

45 grams of NaOH to moles

Levart [38]

Answer:

1.125moles

Explanation:

mass of NaOH,m= 45g

molar mass of NaOH, M= 23+16+1

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3 years ago

The mass of the reactants of a chemical reaction will be _____ the mass of the products.

OLEGan [10]

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4 years ago

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The following reaction has Kp = 109 at 25°C. 2 NO(g) + Br2(g) equilibrium reaction arrow 2 NOBr(g) If the equilibrium partial pr

kati45 [8]

Answer: The equilibrium partial pressure of NO is 0.0034 atm

Explanation:

For the given chemical equation:

$NO(g)+Br_2(g)\rightleftharpoons 2NOBr(g)$

The expression of $K_p$ for above equation follows:

$K_p=\frac{(p_{NOBr})^2}{p_{NO}\times p_{Br_2}}$

We are given:

Equilibrium partial pressure of $Br_2$ = 0.0159 atm

Equilibrium partial pressure of NOBr = 0.0768 atm

$K_p=109$

Putting values in above equation, we get:

$109=\frac{(0.0768)^2}{p_{NO}\times 0.0159}\\\\p_{NO}=0.0034atm$

Hence, the equilibrium partial pressure of NO is 0.0034 atm

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3 years ago

What is the percent mass/volume of sodium chloride solution made by dissolving 5.0 grams of sodium chloride in 40.0 ml of soluti

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$C_{p}=\frac {5g*100\%}{40ml}=12.5\%[\frac{m}{V}]$

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3 years ago