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3 years ago

A substance is melting, so it is transitioning from solid to liquid. What kind of change is this?

Chemistry

2 answers:

Nostrana [21]3 years ago

8 0

Answer:

chemical or physical i dont know for sure i kniw i have learned this juat cant rember

rewona [7]3 years ago

5 0

Answer:

Your answer will be: Physical

Explanation:

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Both mechanical and electromagnetic waves _____.

Allushta [10]

The answer is C.
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2 years ago

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When would a cell use Active Transport? Mark all that apply.

Westkost [7]

Answer:

a c e

Explanation:

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2 years ago

5. 16.3 g of NaCl is dissolved in water to make 1.75 L of solution. What is the molarity of this solution? A 0.159 M B 0.278 M C

ira [324]

Answer: The molarity of this solution is 0.159 M.

Explanation:

Given: Mass of solute = 16.3 g

Volume = 1.75 L

Number of moles is defined as the mass of substance divided by its molar mass.

Hence, moles of NaCl (molar mass = 58.44 g/mol) ar calculated as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{16.3 g}{58.44 g/mol}\\= 0.278 mol$

Molarity is the number of moles of a substance present in a liter of solution.

So, molarity of the given solution is calculated as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.278 mol}{1.75}\\= 0.159 M$

Thus, we can conclude that the molarity of this solution is 0.159 M.

5 0

2 years ago

Physical Meaning of pKa Which of the following aqueous solutions has the lowest pH: 0.1 M HCl; 0.1 M acetic acid (pKa = 4.86); 0

ser-zykov [4K]

Answer:

The solution with the lowest pH is 0.1 M HCl.

Explanation:

Since the three solutions have the same concentration (0,1M) it is only necessary to look at the pKa of each solution.

Also, knowing that a higher pKa means a lower Ka, because pKa = -Log (Ka). Thus, a lower Ka means a lower concentration of protons with a higher pH ( pH = -Log [H+].

The HCl doesn't have a pKa because is a strong acid that dissociates completely. Therefore, this solution produces a lower pH. Looking at the pKa of acetic acid and formic acid solutions, the second with the lowest pH is the formic acid solutions and the higher pH is for the acetic acid solution.

3 0

3 years ago

D. Convert 5.05 x 10-5 ML to hL.

Hitman42 [59]

Answer:

d.5.05*10^-10hl

e.0.45dg

f.7.5*10^5nm

Explanation:

d.1ml=10^-5hl

e.1dg=100000ug

f.1m=1000000000nm

4 0

2 years ago