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Juli2301 [7.4K]
3 years ago
7

How does the density of ice compare with that of liquid water? What evidence can you cite to support your answer?

Chemistry
1 answer:
SpyIntel [72]3 years ago
6 0

Answer: Ice is less dense than water.

Explanation: As water freezes, it expands, making it less dense. This is why ice cubes float in a glass of water.

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Two gases have the same temperature but different pressures. The kinetic-molecular theory does not predict that a. molecules in
olganol [36]

Answer: Option (c) is the correct answer.

Explanation:

Kinetic molecular theory states that particles of a matter are continuously in motion and these molecules represent perfect elastic collision.

So, at the same temperature but different pressures the two gases will have all collisions of the molecules as elastic in nature. It is also possible that molecules in both gases have the same average kinetic energies under given conditions as their molecules might be moving with the same speed.

But we cannot determine the densities of these gases.

Thus, we can conclude that the kinetic-molecular theory does not predict that both gases have the same densities.

8 0
3 years ago
Which of the following elements has the lowest electronegativity?
hram777 [196]
Barium (Ba) has the lowest electronegativity of the choices you have given. 

The electronegativity of Calcium (Ca) is 1
The electronegativity of Strontium (Sr) is 0.95
The electronegativity of Magnseium (Mg) is 1.31 (has the highest)
The electronegativity of Barium (Ba) is 0.89

Of the list above, you can see that Barium has the lower level of electronegativity (0.89). Therefore, the correct answer is D. 

Let me know if you need further info. 

            - Dotz 
4 0
3 years ago
Read 2 more answers
What is the vapor pressure of water at 105 degree Celsius?
ivann1987 [24]
120 kpa is my answer


please can i have a brainliest
5 0
2 years ago
Explain how scientists use geologic time to determine the age of landforms. (3 points)
o-na [289]

Answer: there are three different methods of determining the age of a landform.

1 radiation measurement

2 stratigraphic superposition

3 the fossil record

by using these or a combination of these they determined that the earth is around 4.6 billion years old. and this is where the big bang theory comes into play.

8 0
2 years ago
Read 2 more answers
When a piece of zinc metal is carefully placed in a beaker of strong acid, bubbles form on the surface of the metal and begin to
kati45 [8]

Answer:

A.  a new substance is being produced.

Explanation:

The bubbles most likely indicates that a new substance is being produced by this reaction. In essence, we describe this sort of change as chemical change.

In a chemical change, new substances are usually produced. They are accompanied by the evolution or absorption of energy.

The reaction of Zinc with a strong acid to produce bubbles on the surface of the metal indicates a chemical change and the formation of a new kind of substance.

Take for example, let zinc reacts with hydrocholoric acid, HCl;

   Zn         +      2HCl      →    ZnCl₂     +     H₂

Since Zn is higher than Hydrogen in the activity series, it will displace it from HCl and liberate hydrogen gas as a product. This will cause the bubbles observed in the reaction.

This is a chemical change and new products have been formed.

B and D are wrong because they are both physical changes.

C is wrong because no information about such is provided by the problem statement.

So, when a piece of zinc metal combines with a strong acid, a new kind of substance is produced.

8 0
3 years ago
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