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3 years ago

Name at least three ways we benefit from scientific advancements in our everyday lives.

Chemistry

1 answer:

mel-nik [20]3 years ago

5 0

Answer:

It will make our life easier.

It helps us organize our daily activities.

This helps our work can be done faster.

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A student is driving her car when an insect strikes her windshield. Which statement correctly describes the forces in this situa

Scorpion4ik [409]

Answer:

The insect exerts no force on the windshield, and the windshield strikes the insect with a large force.

Explanation:

:#D

6 0

3 years ago

The frequency factors for these two reactions are very close to each other in value. Assuming that they are the same, compute th

MrRissso [65]

The question is incomplete, complete question is :

The frequency factors for these two reactions are very close to each other in value. Assuming that they are the same, compute the ratio of the reaction rate constants for these two reactions at 25°C.

$\frac{K_1}{K_2}=?$

Activation energy of the reaction 1 , $Ea_1$ = 14.0 kJ/mol

Activation energy of the reaction 2, $Ea_1$ = 11.9 kJ/mol

Answer:

0.4284 is the ratio of the rate constants.

Explanation:

According to the Arrhenius equation,

$K=A\times e^{\frac{-Ea}{RT}}$

The expression used with catalyst and without catalyst is,

$\frac{K_2}{K_1}=\frac{A\times e^{\frac{-Ea_2}{RT}}}{A\times e^{\frac{-Ea_1}{RT}}}$

$\frac{K_2}{K_1}=e^{\frac{Ea_1-Ea_2}{RT}}$

where,

$K_2$ = rate constant reaction -1

$K_1$ = rate constant reaction -2

Activation energy of the reaction 1 , $Ea_1$ = 14.0 kJ/mol = 14,000 J

Activation energy of the reaction 2, $Ea_1$ = 11.9 kJ/mol = 11,900 J

R = gas constant = 8.314 J/ mol K

T = temperature = $25^oC=273+25=298 K$

Now put all the given values in this formula, we get

$\frac{K_1}{K_2}=e^{\frac{11,900- 14,000Jl}{8.314 J/mol K\times 298 K}}=2.3340$

0.4284 is the ratio of the rate constants.

7 0

3 years ago

Explain how the atomic theory was modified from

nasty-shy [4]

Answer: Thomson's showed that atoms contain smaller particles, so it was important to change the theory of daltons. Rutherford found that most of of an atom is hollow and in the middle of an atom is concentrated energy. This contributed to the revision of the plum pudding model.

8 0

4 years ago

Read 2 more answers

PLEASE HELP!!!! WILL GIVE BRAINLIEST!!!!! Is this the only option?

Marta_Voda [28]

I think the first one applys. I may be wrong.

7 0

3 years ago

If an element in a chemical reaction loses electrons, which of the following describes what happens to that element?

EastWind [94]

Answer : The correct option is, (D) it is oxidized.

Explanation :

On the basis of electrons, there are two types of reactions :

(1) Oxidation reaction (2) Reduction reaction

Oxidation reaction : When an element loses electrons in a chemical reaction then that element gets oxidized in the chemical reaction and its oxidation number increases.

Reduction reaction : When an element gains electrons in a chemical reaction then that element gets reduced in the chemical reaction and its oxidation number decreases.

Hence, the correct answer is (D).

6 0

3 years ago