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amid [387]
3 years ago
15

BJECTIVE TYPE QUESTIONS

Chemistry
1 answer:
8090 [49]3 years ago
4 0

Answer:

1.Physical change

2. Chemical change

3. Heat

4.photosynthesis

5. composition

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The movement of water from earths surface and back again
aleksklad [387]
That's the Water Cycle.
8 0
3 years ago
Boiling point elevation means that:
jeka94

Answer:

B. it will take more energy for the particles of the solution to overcome the atmospheric pressure.

Explanation:

i checked the slideshow from educere lol (slide 8 colligative properties lesson)

8 0
3 years ago
What was John Dobereiner’s contribution to the development of the periodic table
erastova [34]

John Dobereiner proposed the idea of similarity in the properties of elements which can be placed together.

He proposed the idea of classification so that we can study the properties of a group of elements together

According to him, three elements can be grouped based on their similarities in properties. This group of three elements was termed as "Triads"

For example :

Li, Na, K

Now the significance of the triad was that the atomic weight of middle element is average of atomic weights of the side atoms

So atomic weight of Na = 23 is average of atomic weights of Lithium and Potassium

7 + 39/2 = 46/2= 23

The other triads were

Ca Sr Ba

Cl Br I

S Se Te


5 0
4 years ago
What happens inside an air-filled balloon is squeezed on all sides?
Blizzard [7]

Answer: The air molecules move closer together.

Explanation:

6 0
3 years ago
Becker did an experiment. Separately, Tracy did the exact same experiment. Becker and Tracy found they each got very different r
maxonik [38]

Answer:

I don't know

Explanation:

Maybe they shouldn't copy each other

5 0
3 years ago
Read 2 more answers
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