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
12345 [234]
3 years ago
11

¡¡¡PLEASE HELP!!! I'm stuck on a question..

Chemistry
1 answer:
Reptile [31]3 years ago
7 0

 The half  life  of uranium- 238  is

 4.46 x10^9  years


 Explanation

Half life  is the time  taken for  the  radioactivity  of   a isotope  to fall  to half  its  original  value.

The  original   mass  of uranium-238  is  4.0 mg

  Half  of original  mass of uranium  = 4.0  mg /2 = 2.0  mg

since  it  take 4.46  x 10^ 9 years  for  the sample   to half  the half life of uranium -238 = 4.46 x10^9 years

You might be interested in
The dominant intermolecular force that causes gaseous hcl molecules to attract one another is
AnnyKZ [126]

Answer:

Dipole-dipole attractions

Explanation:

The Cl atom is more electronegative than H, so it attracts the electrons in the H-Cl bond more to itself.

The Cl end of the molecule becomes partially negative (δ-), and the H end becomes more positive (δ+). This separation of charge is called an electric dipole,

When two HCl molecules are near each other, they arrange themselves so that the negative and positive ends of the dipoles line up and attract the two molecules together.

8 0
3 years ago
An atom of sodium can transfer its one valence electron to an atom of...
seropon [69]

Answer:

I believe it is B,fluorine to complete the octet rule

Explanation:

4 0
3 years ago
Read 2 more answers
What is another name for a chemical change? A. chemical spill B. physical change C. physical property D. chemical reaction
Elenna [48]

The correct answer is D. chemical reaction.

5 0
3 years ago
Hi can anyone answer these two distance and time questions
Likurg_2 [28]
1 is hours and 2 is meters
5 0
3 years ago
Use the chemical equation below to determine how many moles of ammonia
anzhelika [568]

Answer:

If we assume that there will be enough Hydrogen for the reaction to occur, then there will be 8 moles of NH

Explanation:

The balanced equation will look like this:

4N2 + 4H2 -> 8NH

6 0
3 years ago
Other questions:
  • The _____ biome is the driest. Common floras are cacti, and faunas are snakes and lizards.
    7·2 answers
  • Of the atoms listed below, which one will have at least one electron in its d orbital?
    9·1 answer
  • Is MgCo3 = MgO + CO2 redox reactions
    5·1 answer
  • Jena's blueberry-pineapple smoothie measured 200g and was contained in 300ml. What is it's density?
    9·2 answers
  • “A mixture is the chemical bonding of two or more substances in any proportion.” Is this statement true or false? Explain your a
    11·2 answers
  • What is the weather in a high pressure area usually like?In a low?
    14·2 answers
  • What is the correct order of processes in the accretion of planetesimals?
    14·1 answer
  • En 1500 kg de aire hay 0.8 g de dióxido de carbono a cuantos ppm corresponde la muestra de co2
    10·1 answer
  • What is the molarity of a 300.0 mL solution containing 25.0 g of NaCl?
    13·1 answer
  • Activity acid bases solutions project need help !!!!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!