All categories

3 years ago

Four properties of water are listed.

Chemistry

2 answers:

Andrei [34K]3 years ago

6 0

Answer: 1 and 3

Explanation:

Physical properties refer to those properties of a substance that doesn't involve a chemical change or chemical reaction. They are physically observable properties of a substance. For example, we do not need any chemical reaction to observe the fact that water is odourless in its pure state. Also, we only need a thermometer and no chemical reaction to observe it's boiling point. Physical observation tells us that the liquid turns into vapour at that temperature. This is confirmed by observing the loss in volume of the liquid

kobusy [5.1K]3 years ago

4 0

Answer:

It reacts with metals to form metal hydroxide and hydrogen gas. it s an chemical property and it decomposes to H2 and O2 is also another chemical property property. because in these reaction H2O has changed to something else hence are called chemical property.

Explanation:

You might be interested in

[Send a message] as you move across a row from left to right in the period table, atomic numbers of the elements

SashulF [63]

I think it might be D or B
And my other two might be A or C

6 0

3 years ago

Which statement describes a difference between the humid continental and subarctic climates?

-BARSIC- [3]

Answer:

The humid continental climate has hot summers, while the subarctic climate has short, cool summers.

Explanation:

I did the lesson already and got it correct lol

6 0

3 years ago

What is the ultimate end of a high mass star that has a core about 2.8x the mass of our sun?

jolli1 [7]

Answer:

Explanation:

It is formed after the star has ended its star cycle into a supernova. The star collapsed into a neutron star that is smaller than the progenitor star but has inherited angular momentum. IT, therefore, spins faster emitting electromagnetic radiation that seems to pulsate.

5 0

3 years ago

Read 2 more answers

The following diagrams represent mixtures of NO(g) and O2(g). These two substances react as follows: 2NO(g)+O2(g)→2NO2(g) It has

Alja [10]

This is an incomplete question, here is a complete question and an image is attached below.

The following diagrams represent mixtures of NO(g) and O₂(g). These two substances react as follows:

$2NO(g)+O_2(g)\rightarrow 2NO_2(g)$

It has been determined experimentally that the rate is second order in NO and first order in O₂.

Based on this fact, which of the following mixtures will have the fastest initial rate?

The mixture (1). The mixture (2). The mixture (3).

Answer : The mixture 1 has the fastest initial rate.

Explanation :

The given chemical reaction is:

$2NO(g)+O_2(g)\rightarrow 2NO_2(g)$

The rate law expression is:

$Rate=k[NO]^2[O_2]$

Now we have to determine the number of molecules of $NO\text{ and }O_2$

In mixture 1 : There are 5 $NO$ and 4 $O_2$ molecules.

In mixture 2 : There are 7 $NO$ and 2 $O_2$ molecules.

In mixture 3 : There are 3 $NO$ and 5 $O_2$ molecules.

Now we have to determine the rate law expression for mixture 1, 2 and 3.

The rate law expression for mixture 1 is:

$Rate=k[NO]^2[O_2]$

$Rate=k(5)^2\times (4)$

$Rate=k(100)$

The rate law expression for mixture 2 is:

$Rate=k[NO]^2[O_2]$

$Rate=k(7)^2\times (2)$

$Rate=k(98)$

The rate law expression for mixture 3 is:

$Rate=k[NO]^2[O_2]$

$Rate=k(3)^2\times (5)$

$Rate=k(45)$

Hence, the mixture 1 has the fastest initial rate.

4 0

3 years ago

Justin mixed two clear liquids together during an experiment and made the following observations:

svp [43]

Answer:

B. A chemical change occurred which caused the liquid's physical properties to change.

Explanation:

The reduction of the temperature of the system meant that the reaction absorbed heat energy from it. This shows that a chemical reaction was in progress. New products were formed, and this is proved by the change in the color to blue.

6 0

3 years ago

Read 2 more answers