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Verdich [7]
3 years ago
5

Strength training and stretchingexerciseshouldbedonehowoften

Chemistry
2 answers:
NISA [10]3 years ago
7 0
Stretching - everyday
strength training - twice a week.
stealth61 [152]3 years ago
3 0
A few Minutes everyday
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Witch element is the number 14 on the periodic table
Pavlova-9 [17]

Answer:Silicon

Explanation:

Silicon - Element information, properties and uses | Periodic Table.

Royal Society of Chemistry › 14 › si...

Silicon - Element information, properties and uses | Periodic Table

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3 0
4 years ago
Drag the labels onto the table to indicate which type(s of gated ion channels are found in each membrane associated with a chemi
dsp73

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3 0
3 years ago
A piece of fossilized wood has a carbon-14 radioactivity that is 1/4 that of new wood. the half-life of carbon-14 is 5730 years.
Marizza181 [45]

Answer:

1.146 x 10⁴ year.

Explanation:

  • The decay of carbon-14 is a first order reaction.
  • The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.
  • The integration law of a first order reaction is:

<em>kt = ln [A₀]/[A]</em>

<em></em>

k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.

t is the time = ??? years.

[A₀] is the initial percentage of carbon-14 = 100.0 %.

[A] is the remaining percentage of carbon-14 = 1/4[A₀] = 25.0 %.

∵ kt = ln [Ao]/[A]

∴ (1.21 x 10⁻⁴ year⁻¹)(t) = ln (100.0%)/[25.0 %]

(1.21 x 10⁻⁴ year⁻¹)(t) = 1.386.

∴ <em>t </em>= 1.386/ (1.21 x 10⁻⁴ year⁻¹) =  <em>1.146 x 10⁴ year.</em>

3 0
4 years ago
What mass of solid sodium formate (of MW 68.01) must be added to 150 mL of 0.42 mol/L formic acid (HCOOH) to make a buffer solu-
Sergio [31]

Answer:

We need 4.28 grams of sodium formate

Explanation:

<u>Step 1:</u> Data given

MW of sodium formate = 68.01 g/mol

Volume of 0.42 mol/L formic acid = 150 mL = 0.150 L

pH = 3.74

Ka = 0.00018

<u>Step 2:</u> Calculate [base)

3.74 = -log(0.00018) + log [base]/[acid]

0 = log [base]/[acid]

0 = log [base] / 0.42

10^0 = 1 = [base]/0.42 M

[base] = 0.42 M

<u>Step 3:</u> Calculate moles of sodium formate:

Moles sodium formate = molarity * volume

Moles of sodium formate = 0.42 M * 0.150 L = 0.063 moles

<u>Step 4:</u> Calculate mass of sodium formate:

Mass sodium formate = moles sodium formate * Molar mass sodium formate

Mass sodium formate = 0.063 mol * 68.01 g/mol

Mass sodium formate = 4.28 grams

We need 4.28 grams of sodium formate

4 0
3 years ago
A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide?
Aleksandr [31]

<em>Answer:</em>

Symbol =  I

<em>Explanation:</em>

<em>Isotopes</em> are those substances which have same atomic number (Numbers of protons) and different masses (Number of proton + numbers of neutrons).

  • Iodine also have many isotopes like

<em>Iodine-125</em> that contain 53 protons, 72 neutrons.

<em>Iodine-128</em>  that contain 53 protons, 75 neutrons.

<em>Iodine-129 </em> that contain 53 protons, 76 neutrons.

<em>Iodine-131</em> that contain 53 protons, 78 neutrons.

<em>Summary:</em>

  • Here the Iodine-131 is correct answer of this question.

5 0
4 years ago
Read 2 more answers
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