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Arisa [49]
3 years ago
13

When substances are different from the starting substances, ______ has occurred. a physical change a chemical change no change a

mass change
Chemistry
2 answers:
musickatia [10]3 years ago
5 0
A chemical change... But only if the process is irreversible
Nutka1998 [239]3 years ago
4 0

Answer : The correct option is, Chemical change.

Explanation :

Physical change : It is a change in which there is no new compound or substance is formed. In this, changes occurs only in the phase.  This change is reversible in nature.

For example : Water boiled  : It is a physical change because in this process only phase changes from liquid state to gaseous state.

Chemical change : It is a change in which a new or different compound or substance is formed and releases some amount of energy. There is no changes occurs in the phase. This change is irreversible in nature.

For example : Marshmallows browned  : It is a chemical change due to the burning of sugar. In the sugar burning process, sugar react with oxygen to give carbon dioxide and water as a product.

As per question, when the substances are different from the starting substances, chemical change has occurred.

Hence, the correct option is, Chemical change.

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In which or areas on the image dose salinity of the ocean increases
Ronch [10]

Answer and Explanation:

D I believe..

8 0
3 years ago
How many moles of koh are required to prepare 0.80 l of 6.4 m koh? 0.13 mol koh 5.1 mol koh 7.2 mol koh 8.0 mol koh?
wel
Answer is: 5,1 mol KOH.
V (KOH) = 0,8l = 0,8 dm³. 
c (KOH) = 6,4 mol/dm³.
V - volume of solution.
c - concentration of solution.
c = n÷V
n - amount of substance.
n (KOH) = c·V = 6,4 mol/dm³ · 0,8 dm³ = 5,12 mol.
Potassium hydroxide (KOH) can<span> </span>dissolve<span> in water at room temperature.</span>


8 0
4 years ago
Convert 645 Newtons per quart to tons per liter. (The picture is a conversion table for help)
brilliants [131]

Answer:

0.067 ton/Litre.

Explanation:

645 Newtons per quart to tons per liter.

We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:

1 N/q = 100 g/q

Therefore,

645 N/q = 645 N/q × 100 g/q / 1 N/q

645 N/q = 64500 g/q

Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.

Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:

454 g/q = 1 pound/q

Therefore,

64500 g/q = 64500 g/q × 1 p/q / 454 g/p

64500 gram/quart = 142.07 pound/quart

Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.

Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:

2000 p/q = 1 ton/q

Therefore,

142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q

142.07 pound/quart = 0.071 ton/quart

Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.

Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:

1 ton/q = 1/1.06 ton/L

Therefore,

0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q

0.071 ton/quart = 0.067 ton/Litre

Therefore, 0.071 ton/quart is 0.067 ton/Litre.

From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.

7 0
4 years ago
PLEASE HELP ME WITH THIS IT'S DUE TOMORROW
Bond [772]

Answer:

Both:

-They are both made up of cells embedded in an extracellular matrix. It is the nature of the matrix that defines the properties of these connective tissues.

Cartilage:

-Cartilage is thin, avascular, flexible and resistant to compressive forces.

-Cartilages are soft and flexible components present in ear, nose and joints.

Bone marrow:

-Bone is highly vascularised, and its calcified matrix makes it very strong.

-Bones are hard and tough which gives the structural framework of the skeleton in the body.

7 0
3 years ago
❗️❗️i need help with 10 pages of 11th grade chemistry questions. they are mostly mutiple choice. i really need this done I WILL
slamgirl [31]

Answer:

well you didnt post anything

Explanation:

6 0
3 years ago
Read 2 more answers
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