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Zepler [3.9K]
3 years ago
12

Which of the following is an example of a physical change in matter?

Chemistry
2 answers:
sineoko [7]3 years ago
5 0

Answer is B.

Explanation:

A physical change is one in which there is no change in chemical composition of a substance. while a process in which there is change in chemical composition it is called a chemical change.


dsp733 years ago
5 0

b. bending of sodium metal because it is still sodium metal just bent

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A neutral atom has a mass number of 108 and in atomic number of 47 which atom is this? explain how you know.
Colt1911 [192]
Mass number of Silver: The element Silver (Symbol Ag) has the Atomic Number of 47. The number of protons in atom of silver is therefore 47. Silver has the Atomic Mass weight of 107.87. Round to the nearest whole number. The mass number of silver is therefore 108.
3 0
3 years ago
What is the concentration of OH− and pOH in a 0.00072 M solution of Ba(OH)2 at 25 ∘C? Assume complete dissociation.
Mumz [18]

Given :

0.00072 M solution of Ba(OH)_2 at 25^oC .

To Find :

The concentration of OH^-and pOH .

Solution :

1 mole of Ba(OH)_2 gives 2 moles of OH^- ions .

So , 0.00072 M mole of Ba(OH)_2 gives :

[OH^-]=2 \times 0.00072\ M

[OH^-]=0.00144\ M

[OH^-]=1.44\times 10^{-3}\ M

Now , pOH is given by :

pOH=-log[OH^-]\\\\pOH=-log[1.44\times 10^{-3}]\\\\pOH=2.84

Hence , this is the required solution .

3 0
3 years ago
If a hydrate of the formula
Lelu [443]

Answer:

It will turn red

Explanation:

Bases will turn the litmus paper (impregnated with an acid-base indicator) blue.

Acids will turn turn the litmus paper (impregnated with an acid-base indicator) red.

Since the produced HCl is a strong acid, the litmus paper will turn red, when touching the HCl.

The red shows the presence of an acid, in this case HCl.

8 0
3 years ago
how much energy has your body used, in joules, if your health device indicates that 450 calories were burned during your workout
Likurg_2 [28]

Answer:

Total energy consumed = 1,882.8 joules

Explanation:

Given:

Calories burned = 450 calories

Find:

Total energy consumed

Computation:

1 calorie = 4.184 joules

So,

450 calories = 4.184 × 450

450 calories = 1,882.8 joules

Total energy consumed = 1,882.8 joules

7 0
3 years ago
Which represents the self-ionization of water at 25°C? H2O + H2O 2H2 + O2 H2O + H2O H2O2 + H2 H2O + H2O 4H+ + 2O2- H2O + H2O H3O
Vitek1552 [10]
The fourth answer is correct 
H20 + H20  H30 + 0H-
6 0
3 years ago
Read 2 more answers
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