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3 years ago

Is a cube of salt being crushed before being stirred into water a physical or chemical change

2 answers:

6 0

By crushing the salt, you are performing a physical change because you aren't altering the chemical makeup of the salt, just the physical form. Hope this helps! :)

Diano4ka-milaya [45]3 years ago

6 0

It is a physical change

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a 25 ml volume of a sodium hydroxide solution requires 19.6 mL of a 0.189 M HCl acid for neutralization. A 10 mL volume of phosp

Drupady [299]

Answer: 0.172 M

Explanation:

a) To calculate theconcentration of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $HCl$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=0.189M\\V_1=19.6mL\\n_2=1\\M_2=?\\V_2=25mL$

Putting values in above equation, we get:

$1\times 0.189\times 19.6=1\times M_2\times 25\\\\M_2=0.148$

b) To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_3PO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=3\\M_1=?\\V_1=10mL\\n_2=1\\M_2=0.148\\V_2=34.9mL$

Putting values in above equation, we get:

$3\times M_1\times 10=1\times 0.148\times 34.9\\\\M_1=0.172M$

The concentration of the phosphoric acid solution is 1.172 M

3 0

3 years ago

how is the ammonium ion (NH4)1- and the oxalate ion (C2O4) 2- combine written in the ionic compound formed?

lana66690 [7]

Answer: Shown In Photo

Explanation:

just crisscross as shown in photo good luck i suck @ explaining

4 0

3 years ago

An igneous rock is composed primarily of quartz and feldspar. what type of magma most likely formed this rock?

Zarrin [17]

Answer:

4. Felsic

Explanation:

This is a felsic magma.

A felsic magma has high content of silicate minerals. Quartz and feldspar are silicate minerals with a high content of silica in them. Magma with such a rich composition of quartz and feldspar is known as a felsic magma.

A mafic magma is one with low silica content.

8 0

3 years ago

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The boiling point of 100 milliliters of water at sea level, vapor pressure 760 mm hg is 100oc. if, under different conditions, t

eimsori [14]

It has to be D. the time needed to boil the water decreased

7 0

4 years ago

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Round 54,878 to the nearest ten thousand

devlian [24]