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3 years ago

What did Lisa do wrong in regards to lab safety?

Chemistry

1 answer:

kondor19780726 [428]3 years ago

5 0

Answer:she did not do it in the correct order

Explanation:

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Strontium-90 is a radioisotope that will decrease in mass by one-half every 29 years. How many years will it take for a 10.0-gra

Lelechka [254]

Answer: It will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams

Explanation:

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Half life is represented by $t_{\frac{1}{2}$

$t_{\frac{1}{2}=\frac{0.693}{\lambda}$

$\lambda$ = rate constant

Given : Strontium-90 decreases in mass by one-half every 29 years , that is half life of Strontium-90 is 29 years.

As half life is independent of initial concentration, it will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams as the amount gets half.

7 0

3 years ago

How many atoms are in the 1.5 moles of tin atoms?

Anastasy [175]

Answer:

option C = 9.0 x 10²³ atoms

Explanation:

Data Given:

no. of moles of tin (Sn) atoms = 1.5 moles

no. of tin (Sn) atoms = ?

Solution:

Formula used to find number of atoms

no. of moles = no. of atoms / Avogadro's number

Rearrange the above equation:

no. of atoms = no. of moles x Avogadro's number . . . . . . (1)

Where

Avogadro's number = 6.022 x 10²³

Put values in equation 1

no. of atoms = 1.5 x 6.022 x 10²³

no. of atoms = 9.033 x 10²³

Round the figure = 9.0 x 10²³ atoms

So option C is correct

6 0

3 years ago

The power has gone out and you find a flashlight that uses batteries. When you turn on the flashlight, you are transforming:

Semenov [28]

In a flashlight, the electrical energy becomes light energy and thermal energy in the bulb.

5 0

3 years ago

Read 2 more answers

In an experiment Teresa's measures 15.5 mL of water she must have used a

kotykmax [81]

Answer:

transfer pipet that had markings every 0.1 mL.

Explanation:

3 0

3 years ago

if theres no coefficient on a element symbol, is the power automatically 1 like it would be if there was no subscript?

Ivenika [448]

Yup go this website for more information http://dwb.unl.edu/calculators/activities/BalEqn.html

5 0

3 years ago