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3 years ago

12

Ultimately, all scientific knowledge comes from A.experimentation B.observation C.textbooks D.both experimentation & observa

tion

2 answers:

serg [7]3 years ago

6 0

Answer: D

Explanation: both experimentation and observation

Ilia_Sergeevich [38]3 years ago

5 0

The answer is D, because all scientific knowledge comes from experimenting and observing things! i hope this helps! :)

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"The elementary reaction 2 NO2(g) → 2 NO(g) + O2(g) is second order in NO2 and the rate constant at 600 K is 6.77 × 10-1 M-1s-1.

blsea [12.9K]

Answer : The half-life at this temperature is, 3.28 s

Explanation :

To calculate the half-life for second order the expression will be:

$t_{1/2}=\frac{1}{k\times [A_o]}$

When,

$t_{1/2}$ = half-life = ?

$[A_o]$ = initial concentration = 0.45 M

k = rate constant = $6.77\times 10^{-1}M^{-1}s^{-1}$

Now put all the given values in the above formula, we get:

$t_{1/2}=\frac{1}{6.77\times 10^{-1}M^{-1}s^{-1}\times 0.45M}$

$t_{1/2}=3.28s$

Therefore, the half-life at this temperature is, 3.28 s

7 0

3 years ago

The ideal gas constant, R has several different values that could be used. Which quantity causes these differences?

Vera_Pavlovna [14]

Answer:

The answer is A

Explanation:

6 0

2 years ago

What are the best titles a and b A science b pseudoscience

Mars2501 [29]

i don't really know what you are trying to say here, but what i think you are saying is what sounds like a more impressive job?? in my opinion, pseudoscience sounds more fancy and interesting. Since not a lot of people really knows what that is, it sparks conversation.

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3 years ago

How many molecules are in the substance formula of 2C6H1206 (use coefficients)

FrozenT [24]

<u>Answer:</u> The number of formula units present in 2 moles of $C_6H_{12}O_6$ are $1.2044\times 10^{24}$

<u>Explanation:</u>

Formula units are defined as the number of molecules or atoms present in 1 mole of a compound or element respectively.

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of formula units

Here, 2 represents the number of moles of $C_6H_{12}O_6$

We are given:

Moles of $C_6H_{12}O_6$ (glucose) = 2 moles

Number of formula units of $C_6H_{12}O_6=(2\times 6.022\times 10^{23})=1.2044\times 10^{24}$

Hence, the number of formula units present in 2 moles of $C_6H_{12}O_6$ are $1.2044\times 10^{24}$

6 0

3 years ago

I need the answer fast pls it’s scince

harkovskaia [24]

I think the answer is C , more dense

5 0

3 years ago

Read 2 more answers