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GenaCL600 [577]

3 years ago

8

Maria took a walk to the store, did some shopping, and then came home. During Maria's trip, when was her displacement equal to z

ero?
A. 0 hrs

B. It was never 0

C. at 0 hrs then 2hrs

D. At 0.75 to 1.25 hr

1 answer:

velikii [3]3 years ago

6 0

I would say it would be a. It makes the most sense

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Please someone answer and help :)

algol [13]

13. D
14. A
15. C
16. B
17. F
18. E

7 0

3 years ago

A student heats 10.52 g of sodium hydrogen carbonate in a crucible until the compound completely decomposes to sodium carbonate

saveliy_v [14]

Answer:

$m_{Na_2CO_3}^{theoretical}=6.636gNa_2CO_3$

Explanation:

Hello!

In this case, since the decomposition of sodium hydrogen carbonate is:

$2NaHCO_3(s)\rightarrow Na_2CO_3(s)+H_2O(g)+CO_2(g)$

Thus, since there is a 2:1 mole ratio between the sodium hydrogen carbonate and sodium carbonate, and the molar masses are 84.01 and 105.99 g/mol respectively, we obtain the following theoretical yield:

$m_{Na_2CO_3}^{theoretical}=10.52gNaHCO_3*\frac{1molNaHCO_3}{84.01gNaHCO_3}*\frac{1molNa_2CO_3}{2molNaHCO_3} *\frac{105.99gNa_2CO_3}{1molNa_2CO_3}\\\\ m_{Na_2CO_3}^{theoretical}=6.636gNa_2CO_3$

Best regards!

4 0

3 years ago

The use of evaporation and condensation to separate the partsof a mixture is called _____

Keith_Richards [23]

Answer: Evaporation Condensation is used to seperate the parts of a mixture

Explanation: This is because it is the first order of the distilation process

5 0

3 years ago

How many elements have been discovered?<br> A. 110 <br> B. less than 110 <br> C. more than 110

riadik2000 [5.3K]

There are 115 known elements as of today (Feb. 13, 2016)

so, 'C' is the correct answer

8 0

3 years ago

Read 2 more answers

What information does the percent composition of an atom in a molecule

max2010maxim [7]

C.

This is basically the definition of percent composition which is how much mass a element contributes to a specific molecule.

7 0

3 years ago