1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marysya12 [62]
3 years ago
7

Please help me with these Radioactive Decay Problems ASAP! I need helppppp

Chemistry
1 answer:
Masteriza [31]3 years ago
5 0

Answer:

5

Explanation:

it is very simple

You might be interested in
Click on the question mark. Choose the MOST reasonable inference based on the text evidence and what you already know. "in a anc
katrin2010 [14]

Answer:

in an ancient

Explanation:

when the word begins with a vowel you say an instead of a

8 0
3 years ago
Which causes waves in the ocean to occur?​
galina1969 [7]

Answer:

Explanation:

C. energy being transferred from wind

Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest.  The gravitational pull of the sun and moon on the earth also causes waves.

4 0
3 years ago
A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions
Mars2501 [29]

Answer:

Qm  = -55.8Kj/mole

Explanation:

NaOH(aq) + HNO₃(aq) => NaNO₃(aq) + H₂O(l)

Qm = (mc∆T)water /moles acid

Given => 100ml(0.300M) NaOH(aq) + 100ml(0.300M)HNO₃(aq)

=> 0.03mole NaOH(aq) + 0.03mole HNO₃(aq)

=> 0.03mole NaNO₃(aq) + 0.03mole H₂O(l)

ΔH⁰rxn = [(200ml)(1.00cal/g∙°C)(37 – 35)°C]water / 0.03mole HNO₃

= 13,333 cal/mole x 4.184J/cal = 55,787J/mol = 55.8Kj/mole (exothermic)*

Heat of reactions comes from formation of H-Oxy bonds on formation of water of reaction and heats the 200ml of solvent water from 35⁰C to 37⁰C.

4 0
4 years ago
Read 2 more answers
A weak acid (ha) has a pka of 4.001. If a solution of this acid has a ph of 4.110, what percentage of the acid is not ionized? (
OverLord2011 [107]

99.9224 % of the acid is not ionized.

____HA + H₂O ⇌ A⁻ + H₃O⁺

I: ___<em>c</em> ________0 ____0  

C: _-α<em>c</em> _______+α<em>c</em> __+α<em>c </em>

E: <em>c</em>(1-α) _______α<em>c</em> ___α<em>c </em>

pH = 4.110

[H₃O⁺] = α<em>c</em> = 10^(-4.110) mol/L = 7.76 × 10⁻⁵ mol/L

α = 7.76 × 10⁻⁵

1 – α = 1 - 7.76 × 10⁻⁵ = 0.999 224 = 99.9224 %

7 0
3 years ago
Where was the first permanent European settlement in what is now the United States?
siniylev [52]

Answer:

Jamestown, Virginia

Explanation:

6 0
3 years ago
Other questions:
  • Acetanilide has a solubility of 1.00 g/185 ml in 25 oc water and 1.00 g/20 ml in 100 oc water. what is the minimum volume of wat
    14·1 answer
  • Calculate the final temperature of a sample of carbon dioxide of mass 16.0 g that is expanded reversibly and adiabatically from
    13·1 answer
  • . Explain the differences between ionic, nonpolar covalent, and polar covalent bonds.
    12·1 answer
  • You make some iced tea by dropping 325 grams of ice into 500.0 mL of warm tea in an insulated pitcher. If the tea is initially a
    6·1 answer
  • PLEASE HELPPP ME!!!!​
    10·1 answer
  • PLS HELP I GIVE BRANLIEST !!!
    7·1 answer
  • All of the following are examples of suspensions except what?:
    15·1 answer
  • 2NaOH + H2So4=______+2H2O<br>​
    14·1 answer
  • How many grams of oxygen are required to burn 3.01 x 10^23 propane molecules?
    12·1 answer
  • Please help fast what is this molecule called
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!