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abruzzese [7]
3 years ago
13

Nys, de

Chemistry
2 answers:
o-na [289]3 years ago
7 0

Answer:

\boxed{\text{(2) A mixture can be separated by physical means.}}

Explanation:

For example, you can separate a mixture of sand and water by pouring it through a coffee filter.

(1) is wrong. A mixture must have at least two components.

(3) is wrong. A mixture can have a any composition depending on the amount of each component.

(4) is wrong. A mixture of sand and water is heterogeneous,

san4es73 [151]3 years ago
7 0

answer is #2 : a mixture can be separated by physical means

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5. When doing an experiment, aside from doing calculations, what can you do to
elena-s [515]

Answer:

check which reactant is totally consumed and which one remains in the mixture

Explanation:

<em>Apart from doing calculations during an experiment, one can determine which reactant is limiting and which one is in excess by checking the resulting mixture for the presence of reactants.</em>

A limiting reactant is one that determines the amount of product formed during a reaction. It is usually a reactant that is lower than stoichiometry amount.

On the other hand, an excess reactant is one that is present in more than the stoichiometrically required amount during a reaction.

Limiting reactants will be totally consumed in a reaction while excess reactant would still be seen present in mixture after the reaction has stopped.

<u>Hence, apart from using stoichiometric calculation to determine which reactant is limiting or in excess during an experiment, one can just check the final mixture of the reaction for the presence of any of the reactants. The reactant that is detected is the excess reactant while the one without traces in the final mixture is the limiting reactant.</u>

4 0
3 years ago
Which body part is proximal to the hip?<br> O elbow<br> O foot<br> O knee<br> O shoulder
fgiga [73]

Answer:

elbow

Explanation:

These terms are replaced by: Proximal: Closer to the point of attachment with the torso. In other words, closer to the shoulder or the hip. The elbow is proximal to the wrist.

6 0
3 years ago
Read 2 more answers
The pH of a 0.23M solution of acrylic acid HC3H3CO2 is measured to be 2.44. Calculate the acid dissociation constant Ka of acryl
belka [17]

Answer:

Kₐ =  5.7 x 10⁻⁵

Explanation:

The equilbrium for this acid is

HC₃H₃CO₂ + H2O    ⇄ H₃O⁺  +   C₃H₃CO₂ ⁻  ,

and the equilibrium constant for acrylic acid is given by the expression:

Kₐ = [ H₃O⁺][ C₃H₃CO₂⁻ ] / [ HC₃H₃CO₂ ]

Since  the pH of the 0.23 M solution is known , we can calculate [ H₃O⁺].

The ][ C₃H₃CO₂⁻ ]  is equal to  [ H₃O⁺] from the above equilibria (1:1)

Finally [ HC₃H₃CO₂ ] is known.

pH = - log  [ H₃O⁺]

taking antilog to both sides of the equation

10^-pH =  [ H₃O⁺]

Substituting

10^-2.44 =  [ H₃O⁺]  = 3.6 x 10⁻³

[ C₃H₃CO₂⁻ ] = 3.6 x 10⁻³

Kₐ = ( 3.6 x 10⁻³ ) /0 .23 = 5.7 x 10⁻⁵

7 0
3 years ago
The emission of the light waves in the lasers allows them to overlap properly to create larger waves, which means that _____ ove
Vikentia [17]
The emission of the light waves ..................... which means that THE TROUGHS OF ONE WAVE AND THE CREST OF ANOTHER overlap.
When the trough and the crest of wave overlap, it results in constructive interference and the amplitude of the two waves are added together  to form a larger amplitude.<span />
5 0
4 years ago
Which atom has the lowest(smallest) ionization energy?<br> A. Na<br> B.K<br> C. Me<br> D. Ca
serious [3.7K]
K. Ionization energy increases as you go up and to the right, and k is the furthest left and furthest down
7 0
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