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iogann1982 [59]
4 years ago
7

Physical properties are: a. those that a substance displays without changing its composition. b. those that cause atoms and mole

cules to change. c. identical for all solid matter. d. those that a substance displays only through changing its composition. e. none of the above
Chemistry
1 answer:
salantis [7]4 years ago
6 0

Answer: the correct option is A (those that a substance displays without changing its composition.)

Explanation:Physical properties are those that a substance displays without changing its composition. They are observable properties of a system that can be used to describe it's change between momentary states. I hope this helps. Thanks

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In a particular experiment at 300 ∘C, [NO2] drops from 0.0100 to 0.00800 M in 100 s. The rate of appearance of O2 for this perio
Tems11 [23]

Answer:

1\times{10}^{-5}\frac{M}{s}

Explanation:

The stoichiometry for this reaction is  

2NO_2\rightarrow2NO+O_2

The rate for this reaction can be written as  

-r_{NO_2}=-\frac{d\left[NO_2\right]}{dt}=\frac{(0.01-0.008)M}{100s}=2\times{10}^{-5}\frac{M}{s}

This rate of disappearence of NO_2 can be realated to the rate of appearence of O_2 as follows  (the coefficients of each compound are defined by the stoichiometry of the reaction)

-r_{O_2}=-r_{NO_2}\times\frac{coefficient\ O_2\ }{coefficient\ NO_2}=2\times{10}^{-5}\frac{M}{s}\times\frac{1\ mole\ O_2\ }{2\ mole\ NO_2}=1\times{10}^{-5}\frac{M}{s}

6 0
4 years ago
Interpretacao gerais das praticas <br>sobre densidade de amostra solido e liquido<br>​
Savatey [412]

Answer:

O sólido tem densidade mais alta em comparação ao líquido.

Explicação:

A densidade da amostra sólida é maior do que a densidade do líquido porque há pouco espaço entre as partículas do sólido. A densidade tem relação inversa com o volume de uma substância, se uma substância ocupa mais espaço então sua densidade é menor, enquanto se a substância ocupa menos espaço então tem maior densidade. As substâncias sólidas ocupam menos espaço em comparação com as substâncias líquidas, então podemos dizer que a densidade do sólido é maior do que as substâncias líquidas.

6 0
3 years ago
Place the following substances in Order of decreasing boiling point H20 N2 CO
kirill [66]

Answer:

-195.8º < -191.5º < 100º

Explanation:

Water, or H20, starts boiling at 100ºC.

Nitrogen, or N2, starts boiling at -195.8ºC.

Carbon monoxide, or C0, starts boiling at -191.5ºC.

When we place these in order from decreasing boiling point:

-195.8º goes first, then -191.5º, and 100º goes last.

4 0
4 years ago
Read 2 more answers
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Paraphin [41]

Answer:

-2, -1, 0, +1, +2

Explanation:

The quantum numbers describe the quantum state of an electron in an atom. These numbers are symbolized as n, l, m, and s. There are rules for the combination of these numbers. The angular quantum number (ℓ) is related to the magnetic number (<em>m</em>): if ℓ is equal to a number a, thus <em>m</em> can be any integer number between - a and +a.

According to this rule:

If ℓ = 2, thus <em>m</em> can be have a value of an integer between -2 and +2 ⇒ -2, -1, 0, +1, +2

6 0
3 years ago
What is number 2? the brain stem......
trasher [3.6K]

The brainstem is an evolutionary ancient part of the brain and is sometimes called the ' reptilian brain' as it provides the basic bodily control in reptiles and other non-mammals.

3 0
3 years ago
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