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2 years ago

What happens when a substance undergoes a physical change?

Chemistry

2 answers:

murzikaleks [220]2 years ago

7 0

Answer:

Some physical properties change, but the substance keeps its identity.

When dealing with these kind of questions, understand that the keyword here is physical change. Thus, all options that says no physical properties change are WRONG. So this leaves us with only 2 answers left. However, this is a physical change, no chemical change. Thus, the substance will keep its identity and not change.

Darya [45]2 years ago

6 0

Answer:

some physical properties change but it still keeps its identity.

Explanation:

Like when an iron bar is turned into iron filings.. it is still iron but it has changed physically.

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Will mark as Brainliest.

Bess [88]

The answer should be A, increase the concentration of both

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3 years ago

The concentration of a NaOH solution was experimentally determined by dissolving 0.7816 grams KHP (204.2212 grams/mol) in 50.0 m

REY [17]

Answer:

The concentration of the standard NaOH solution is 0.094 moles/L.

Explanation:

In the titration, the equivalence point is defined as the point where the moles of NaOH (the titrant) and KHP (the analyte) are equal:

moles of NaOH = moles of KHP

$[NaOH]xV_{NaOH} = moles of KHP$

$[NaOH] = \frac{moles of KHP}{V_{NaOH}}$

The $V_{NaOH}$ is 40.82mL = 0.04082L and the moles of KHP are

$0.7816g / 204.2212\frac{g}{mol} = 3.827x10^{-3} moles$

Replacing at the first equation:

$[NaOH] = \frac{3.827x10^{-3}moles}{0.04082L} = 0.094 moles/L$

3 0

2 years ago

During an experiment, iron powder and sulfur powder were heated together to form a black mass. It was observed that a magnet, wh

Readme [11.4K]

Answer:The correct answer is option(C).

Explanation:

Compound is a substance made up of two or more elements which are chemically joined together.

When the iron and sulfur heated together in the test tube a chemical reaction reaction took place between the iron and sulfur which lead to the formation of iron sulfur compound (here black mass).And this compound will differ in chemical proprieties with respect to its constituting pure element.

When the magnet was brought near to it , it doesn't attracted the black mass towards itself.This is because the 'The black mass is a compound and no longer retains the properties of iron'.

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2 years ago

Which gas law would you use for the following problem: What pressure is required to hold 8.0 moles of oxygen gas in an 8.0 L con

emmainna [20.7K]

Answer:

Ideal Gas Law ( PV = nRT)

Explanation:

Using the Ideal Gas Law, we have; PV = nRT

Where P= Pressure = ?

V= Volume = 8.0 L

n = moles = 8.0

R = Gas constant = 0.0821 L.atm/mol/K

T = 80° c + 273 = 353.15K

Therefore Pressure would be; P = nRT/ V = 8 x 0.0821 x 353.15 / 8 = 28.9atm

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2 years ago

Which process produces the sex cells?<br><br>A:Mitosis<br><br>B:Meiosis

galben [10]

Your answer is B Meiosis

3 0

2 years ago

Read 2 more answers