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3 years ago

Why did bohrs observations of gaseous elements not reveal a complete spectrum when the light was shone through a prism? explain

1 answer:

4 0

The Bohr model proposed that electrons could just have characterized vitality levels thus when rotting back to a lower vitality level discharge a specific measure of vitality. Since the measure of vitality could be changed over to a specific recurrence then particular emanation lines were found in the electromagnetic range. Alternate speculations couldn't clarify the discharge lines.

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PLEASE HELP!!!The measurement of how fast an object moves over a certain amount of time.

ad-work [718]

1- Acceleration
2- Velocity
3- 25 mph
4- 50 mph east
5- Speed
6- 0
7- It decreases

3 0

3 years ago

Read 2 more answers

Write the complete balanced equation for the following reaction: c7h14 o2 yields co2 h2o

Svetach [21]

C7H14 + 10.5 O2 -> 7 CO2 + 7 H2O

Or, if whole numbers must be used:

2 C7H14 + 21 O2 -> 14 CO2 + 7 H2O

3 0

3 years ago

Read 2 more answers

How do I identify significant figures in chemistry?

Komok [63]

1) START counting for sig. figs. On the FIRST non-zero digit.

2) STOP counting for sig. figs. On the LAST non-zero digit.

3) Non-zero digits are ALWAYS significant.

4) Zeroes in between two non-zero digits are significant. All other zeroes are insignificant.

3 0

3 years ago

How many moles of fe2o3 will be produced from 18.0 g of fe assuming o2 is available in excess

Advocard [28]

Answer:

0.161moles

Explanation:

Given parameters:

Mass of Fe = 18g

Oxygen gas is in excess

Unknown:

Number of moles of Fe₂O₃ produced = ?

Solution:

To start with, let us write a chemically balanced equation before proceeding to understand the nuances of this problem.

4Fe + 3O₂ → 2Fe₂O₃

In the equation above above, 4 mole of iron combined with 3 moles of oxygen gas to 2 moles of Fe₂O₃.

In solving this problem, we can identify that Fe is the limiting reactant since we have been told oxygen gas is in excess. The suggests that the extent to which the product is formed and the reaction proceeds hinges on the amount of Fe we have.

It is best to work from the given, or known reactant to the unknown

The known in this scenario is the mass of Fe. Let us find the number of moles of this specie;

Number of moles of Fe = $\frac{mass}{molar mass}$

Molar mass of Fe = 56g/mol

Number of moles = $\frac{18}{56}$ = 0.32mol

Using this known number of moles of Fe, we can relate it to that of the unknown amount of the product and obtain the number of moles.

4 moles of Fe produced 2 moles of Fe₂O₃

0.32 moles of Fe will produce $\frac{0.32 x 2}{4}$ = 0.161moles

8 0

3 years ago

A 30.00 mL sample of HBr was titrated using 0.1756 M NaOH. Determine the concentration of the HBr sample if 17.52 mL of NaOH was

postnew [5]

Answer: The concentration of HBr sample is 0.1025 M

Explanation:

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is HBr

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=?M\\V_1=30.00mL\\n_2=1\\M_2=0.1756M\\V_2=17.52mL$

Putting values in above equation, we get:

$1\times M_1\times 30.00=1\times 0.1756\times 17.52\\\\M_1=\frac{1\times 0.1756\times 17.52}{1\times 30.00}=0.1025M$

Hence, the concentration of HBr sample is 0.1025 M

5 0

3 years ago