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leva [86]
3 years ago
7

Which of these is an indication that a chemical reaction has occurred?

Chemistry
2 answers:
Sergio039 [100]3 years ago
5 0
D- If there is a color change that is indicative to that being a chemical change.

A, B, and C are examples of physical changes.
Pepsi [2]3 years ago
4 0

The answer is D. a change in color of a substance

Just did test

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Pairs of liquids that will mix in all proportions are called ________ liquids. unsaturated polar liquids supersaturated saturate
yKpoI14uk [10]

Answer:

Pairs of liquids that will mix in all proportions are called a.) miscible liquids. An unsaturated solution has solute less than the maximum.

Explanation:

i hope this helps . MISCIBLE LIQUIDS

8 0
3 years ago
Which of the following surfaces creates the most friction?
Bumek [7]
The correct answer would be 
A) Gravel driveway
This is the answer because if you have ever been to an ice skating rink, you know that you can glide quickly on it and if you fall, then you just continue sliding its basically a big waterside. In a bowling alley and an indoor basket ball court, most of the floors are probably waxed and your shoes don't have much of a grip on the floor. If you have ever fallen on a driveway, you would know that with the amount of force that you land on the driveway and the weight that is used, you create a lot of friction because of your skin rubbing against the driveway and you also have the marks to prove it! 
Hope this helps and have a wonderful day! :)
4 0
3 years ago
What energy source is least expensive ?
Elden [556K]

Answer:

Solar Energy.

Explanation:

There is more solar radiation hitting their surface, which means they can produce more electricity. Solar energy is more valuable in places with expensive electricity. If two solar panel systems in different cities have the same energy output, savings will be greater in the city with the highest kWh prices.

3 0
3 years ago
Which outcome occurs when bonds between atoms are broken or formed? A. a physical change B. an element increasing in size C. a c
snow_tiger [21]
The answer is C. Chemical change.
5 0
3 years ago
Read 2 more answers
2. A 10.0 g ice cube, initially at 0.0ºC, is melted in 100.0 g of water that was initially 20.0ºC. After the ice has melted, the
arlik [135]

Answer:

The heat lost  by the water  Q_{water}  = 3.8 KJ

The heat gain by ice  Q_{ice} = 228.76 J

The heat required to melt the ice Q_{melt} = 3340 J

Explanation:

Mass of ice cube m_{ice} = 10 gm

Initial temperature of ice cube T_{ice} = 0 °c

Mass of water m_{water} = 100 gm

Initial temperature of water T_{w} = 20 °c

Final temperature of mixture T_{f} = 10.93 °c

(a). Total heat lost by the water Q_{water}  =  m_{water} C_{w} ( T_{f} - T_{w} )

⇒ Q_{water}  = 100 × 4.184 (20 - 10.93)

⇒ Q_{water}  = 3.8 KJ

This is the heat lost  by the water.

(b). Heat gained by the ice cube Q_{ice} = m_{ice} C_{ice} (T_{f} - T_{ice}  )

⇒ Q_{ice} = 10 × 2.093 × ( 10.93 - 0)

⇒ Q_{ice} = 228.76 J

This is the heat gain by ice.

(C). Heat required to melt the ice Q_{melt} = m_{ice} × Latent Heat

⇒ Q_{melt} = 10 × 334

⇒ Q_{melt} = 3340 J

This is the heat required to melt the ice.

7 0
3 years ago
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