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goldenfox [79]
3 years ago
11

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is like

ly occurring?
A solid forms, and there is a change of color.
A gas forms, and there is a change of color.
A solid forms, and light is emitted.
A gas forms, and light is emitted.
Chemistry
2 answers:
mylen [45]3 years ago
3 0

Answer:

a solid forms, and there is a change of color.

Explanation:

Ray Of Light [21]3 years ago
3 0
Solid forms, there is a change of color when in the context of precipitation.
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Which layer of the atmosphere is between the exosphere and the mesosphere
Olenka [21]

The atmosphere of earth is made of five main layers.

1) Troposphere : This is the lowest part of the atmosphere. Most of the air that makes up the atmosphere is present in this layer.

2) Stratosphere : This layer is present above troposphere and extends up to 50 km. It contains ozone layer which prevents the harmful ultraviolet rays from the sun from entering the lower troposphere

3) Mesosphere : The layer above stratosphere is known as mesosphere.

4) Thermosphere : The region lies above mesosphere.

5) Exosphere : The is the outermost region of the atmosphere.

From the above discussion we can see that the layer that lies between exosphere and mesosphere is Thermosphere

8 0
3 years ago
Read 2 more answers
If a temperature increase from 21.0 ∘c to 35.0 ∘c triples the rate constant for a reaction, what is the value of the activation
Airida [17]

Answer:

59.077 kJ/mol.

Explanation:

  • From Arrhenius law: <em>K = Ae(-Ea/RT)</em>

where, K is the rate constant of the reaction.

A is the Arrhenius factor.

Ea is the activation energy.

R is the general gas constant.

T is the temperature.

  • At different temperatures:

<em>ln(k₂/k₁) = Ea/R [(T₂-T₁)/(T₁T₂)]</em>

k₂ = 3k₁ , Ea = ??? J/mol, R = 8.314 J/mol.K, T₁ = 294.0 K, T₂ = 308.0 K.

ln(3k₁/k₁) = (Ea / 8.314 J/mol.K) [(308.0 K - 294.0 K) / (294.0 K x 308.0 K)]

∴ ln(3) = 1.859 x 10⁻⁵ Ea

∴ Ea = ln(3) / (1.859 x 10⁻⁵) = 59.077 kJ/mol.

4 0
3 years ago
Which statement describes an investigation to determine a chemical property? A. determining the reactivity of baking soda and vi
Vika [28.1K]

Answer:

Explanation:

A gives off a visible gaseous product when the two are mixed.

The others all talk about physical properties like phase changes and densities.

5 0
3 years ago
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CORRECT ANSWER GETS BRAINLIEST! PLEASE HELP AND EXPLAIN!!
Anna71 [15]

Answer:

A car stopped at the top of the hill

Explanation:

It's potenial energy because, the car could go down the hill and create kinetic energy. Hope this helps! Please give me brainly it is correct!

3 0
3 years ago
What I need help fast!
ozzi
The correct answer would be 3
3 0
2 years ago
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