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3 years ago

J. J. Thomson's plum pudding model was based on all BUT one of these beliefs. That is

1 answer:

6 0

Answer: j.j. Thompson didn't know at the time of the nucleus so the belief that was missing from the plum pudding model would be the nucleus.

Explanation:

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Which organism has a nerve net? A fish B hydra C flatworm D sponge

Kaylis [27]

B. Hydra, because Hydraare an ideal class of Cnidaria to research and on which to run tests.

5 0

3 years ago

Read 2 more answers

It is found that a gas undergoes a first-order decomposition reaction. If the rate constant for this reaction is 8.1 x 10-2 /min

kap26 [50]

Answer:

28.43 min

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given that:

The rate constant, k = $8.1\times 10^{-2}$ min⁻¹

Initial concentration $[A_0]$ = 0.1 M

Final concentration $[A_t]$ = $1.0\times 10^{-2}$ M

Time = ?

Applying in the above equation, we get that:-

$1.0\times 10^{-2}=0.1e^{-8.1\times 10^{-2}\times t}$

$0.1e^{-8.1\times \:10^{-2}t}=10^{-2}$

$e^{-8.1\times \:10^{-2}t}=\frac{1}{10}$

$\ln \left(e^{-8.1\times \:10^{-2}t}\right)=\ln \left(\frac{1}{10}\right)$

$t=28.43\ min$

3 0

4 years ago

Map Formulate your hypothesis. List down the materials. • Write the methods.

Whitepunk [10]

Answer:

How to Formulate an Effective Research Hypothesis

State the problem that you are trying to solve. Make sure that the hypothesis clearly defines the topic and the focus of the experiment.

Try to write the hypothesis as an if-then statement. ...

Define the variables.

Explanation:

5 0

3 years ago

Determine the molar mass of the following elements. Include units in your answer.

son4ous [18]

Do the atomic mass times the number of atoms you have. That'll give you your answer. Hope it helps!

8 0

3 years ago

Consider the balanced equation of K I KI reacting with P b ( N O 3 ) 2 Pb(NOX3)X2 to form a precipitate. 2 K I ( a q ) + P b ( N

professor190 [17]

Answer: 50.7 grams

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

a) moles of $KI$

$\text{Number of moles}=molarity\times {\text {Volume in L]}=0.417M\times 0.528L=0.220moles$

The balanced chemical equation is:

$2KI(aq)+Pb(NO_3)_2(aq)\rightarrow PbI_2(s)+2KNO_3(aq)$

$KI$ is the limiting reagent as it limits the formation of product and $Pb(NO_3)_2$ is in excess.

According to stoichiometry :

2 moles of $KI$ give = 1 mole of $PbI_2$

Thus 0.220 moles of $KI$ give= $\frac{1}{2}\times 0.220=0.110moles$ of $PbI_2$

Mass of $PbI_2=moles\times {\text {Molar mass}}=0.110moles\times 461.01g/mol=50.7g$

Thus 50.7 g of $PbI_2$ will be formed.

6 0

4 years ago