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
Sliva [168]
3 years ago
6

If an element has a half life of one million years, how long will it take to be completely gone

Chemistry
1 answer:
Aleonysh [2.5K]3 years ago
3 0
It should be 2 million years
You might be interested in
Lead has an atomic number of 82. Which statement describes all neutral atoms and ions of lead?
IRINA_888 [86]

The neutral atom of lead must have 82 protons while ions can have b or less than 82.

The atomic number of an element is the number of protons in the nucleus of the element.

Also, for neutral atoms, the number of protons equals the number of electrons.

In ionic form, the number of protons/electrons of an atom may vary and be different from that of the neutral form.

Positive charges mean that the ion has less proton than its neutral version while negative charges mean that it has more electrons than its neutral version.

Thus, the neutral atom of lead will contain an equal number of protons as the electrons while its ionic form can have more or less than 82 protons.

More on atoms can be found here: brainly.com/question/803445?referrer=searchResults

6 0
2 years ago
-
Dovator [93]

Answer:

5 × 10^-4 L

Explanation:

The equation of the reaction is;

2KClO3 = 2KCl + 3O2

Number of moles of KClO3 = 13.5g/122.5 g / mol = 0.11 moles

From the stoichiometry of the reaction;

2 moles of KClO3 yields 3 moles of O2

0.11 moles of KClO3 yields 0.11 × 3/2 = 0.165 moles of oxygen gas

From the ideal gas equation;

PV= nRT

P= 85.4 × 10^4 KPa

V=?

n= 0.165

R= 8.314 J K-1 mol-1

T= 40+273 = 313K

V= 0.165 ×8.134 × 313/85.4 × 10^4

V=429.4/85.4 × 10^4

V= 5 × 10^-4 L

3 0
3 years ago
How many moles of MgCl2 are there in 319 g of the compound?
Leokris [45]

Hey there!:

Molar mass MgCl2 = 95.2110 g/mol

So:

1 mole MgCl2 -------------- 95.2110 g

moles MgCl2 ---------------- 319 g

moles MgCl2 = 319 * 1 / 95.2110

moles MgCl2 = 319 / 95.2110

=> 3.350 moles of MgCl2


Hope that helps!

3 0
3 years ago
7.25 x 10-6<br><br> What is the scientific notation
ankoles [38]
The answer will be 66.5
3 0
3 years ago
Read 2 more answers
How many gallons of soft drink are there in a 2.0L bottle
juin [17]

0.528344 gallons in a 2 liter

6 0
3 years ago
Other questions:
  • An enzyme can catalyze a reaction with either of two substrates, S1 or S2. The Km for S1 was found to be 2.0 mM, and the Km, for
    9·1 answer
  • The table compares some characteristics of two atoms.
    8·2 answers
  • Why is yeast a dependent variable when you are using it for baking and for the dough to rise.
    5·1 answer
  • What coefficients would balance the following equation?
    5·2 answers
  • the water in a tea pot is heated on a stove top. The temperature of the water increases. Is this an endothermic or exothermic pr
    10·1 answer
  • Gently boiling water had the ____ temperature as rapidly boiling water. <br><br> What is the blank?
    13·1 answer
  • Please show proof for brainliest, i will rate you 5 stars if your answer is great!
    7·1 answer
  • How much energy is released if a sample loses 0.025 kg mass through<br> radioactive decay?
    7·2 answers
  • A 200-g sample of a metal absorbs 3,080 J as it is heated from 20°C to 60°C. What is the identity of the sample?
    13·2 answers
  • Can someone please help me here is the question i will give u extra points All of the following can be inherited traits except f
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!