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natita [175]
3 years ago
12

Which phrase describes the movement of the continents?

Chemistry
2 answers:
Over [174]3 years ago
8 0

Answer:coming together and moving apart

Explanation:

thay do both

OleMash [197]3 years ago
7 0
Coming together and moving apart
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aivan3 [116]
True, it is formed from immense weathering over time. Hope it helped!
6 0
3 years ago
How many moles of disulfur decafluoride are present in 3.99 x 104 molecules of this compound? moles
arsen [322]

<u>Answer:</u> The number of moles of disulfur decafluoride is 6.62\times 10^{-20}

<u>Explanation:</u>

We are given:

Number of disulfur decafluoride molecules = 3.99\times 10^4

According to mole concept:

6.022\times 10^{23} number of molecules are contained in 1 mole of a compound.

So, 3.99\times 10^4 number of molecules will be contained in = \frac{1mol}{6.022\times 10^{23}}\times 3.99\times 10^{4}=6.62\times 10^{-20}mol of disulfur decafluoride.

Hence, the number of moles of disulfur decafluoride is 6.62\times 10^{-20}

6 0
3 years ago
The following data were measured for the reaction BF3(g)+NH3(g)→F3BNH3(g): Experiment [BF3](M) [NH3](M) Initial Rate (M/s) 1 0.2
Rama09 [41]

Answer:

-r_{A}=k\times[BF_3]^{1}\times[NH_3]^{1}

Explanation:

The rate law of a chemical reaction is given by

-r_{A}=k\times[BF_3]^{\alpha}\times[NH_3]^{\beta}

This law can be written for any experiment, and making the quotient between those expressions the reaction orders can be found

Between experiments 1 and 2  

\frac{-r_{A1}}{{-r}_{A2}}=\left(\frac{\left[NH_3\right]_1}{\left[NH_3\right]_2}\right)^\beta

Then the expression for the calculation of \beta

\beta=\frac{ln\frac{-r_{A1}}{-r_{A2}}}{ln\left(\frac{\left[NH_3\right]_1}{\left[NH_3\right]_2}\right)}=\frac{ln\frac{0.2130}{0.1065}}{ln\left(\frac{0.250}{0.125}\right)}

Resolving  

\beta=1

Doing the same between experiments 3 and 4 the expression for \alpha is

\alpha=\frac{ln\frac{-r_{A3}}{-r_{A4}}}{ln\left(\frac{\left[BF_3\right]_3}{\left[BF_3\right]_4}\right)}=\frac{ln\frac{0.0682}{0.1193}}{ln\left(\frac{0.200}{0.350}\right)}

Resolving  

\alpha=1

This means that the rate law for this reaction is  

-r_{A}=k\times[BF_3]^{1}\times[NH_3]^{1}

5 0
3 years ago
34 grams of carbon react with an unlimited amount of h2o. the reaction is: c + h2o → co + h2 the equation is balanced. the start
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A  periodic  table  is  tabular  arrangement  of  the  chemical  elements,  ordered  by  their  atomic  number,electronic  configuration  and   recurring   chemical  properties.  carbon  is   in  group  14   and   period  two. The  atomic  mass  of  carbon  from   periodic  table is  12.01 g/mole
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