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
mihalych1998 [28]
3 years ago
13

jai was measuring the radioactivity of different radioactive isotopes. isotope a had a starting radioactive level of 50 g, and a

fter 4 days it measured at 30 g. isotope b had a starting radioactive level of 75 g, and after 4 days it measured at 25 g. which best explains the isotopes?
Chemistry
2 answers:
riadik2000 [5.3K]3 years ago
6 0
Try b im pretty sure its right 
poizon [28]3 years ago
6 0

it sure i B i got i checked

You might be interested in
Which compounds are the Bronsted- Lowry bases in the equilibrium?
Butoxors [25]
Its D for plato. 
by other people who asked




 
4 0
4 years ago
Read 2 more answers
Which of the following describes a synthesis reaction?
Grace [21]

Answer:

D. Two reactants combine to form one product

Explanation:

The definition of synthesis in chemistry is "the production of chemical compounds by reaction from simpler materials."

A is decomposition, B is DOUBLE replacement, and C is SINGLE replacement.

7 0
4 years ago
Alcl3+Na =NaCl+ Al .did Al change oxidation number
saul85 [17]

Answer:

yes it is ( From +3 to 0 )

Explanation:

If this is the balanced equation:

AlCl3     +    3Na ——>    3NaCl      +      Al

Al      Cl        3Na             Na     Cl            Al

+3     -3        0                    +1       -1            0

5 0
4 years ago
Which material is a mixture?<br> 1. water<br> 2. air <br> 3. methane<br> 4. magnesium
skelet666 [1.2K]
Pure air is a mixture of several gases that are invisible and odorless. Consists of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide.  
3 0
3 years ago
Read 2 more answers
When the volume of a gas is
Cerrena [4.2K]

Answer:

THE NEW VOLUME OF THE GAS IS 406 mL WHEN THE TEMPERATURE CHANGES FROM 765 K TO 315 K.

Explanation:

When the temperature changes from  765 K to 315K, the volume has changed from 986 mL to?

V1 = 986 mL = 0.986 L

T1 = 765 K

T2 = 315 K

V2 = unknown

Using Charles' equation of gas laws;

V1 / T1 = V2 / T2

Making V2 the subject of the formula:

V2 = V1 T2 / T1

V2 = 0.986 * 315 / 765

V2 = 0.406 L

V2 = 406 mL

So therefore, the volume of a gas changes from 986 mL to 406 mL as a result of a change in temperature from 765 K to 315 K.

7 0
3 years ago
Other questions:
  • which number should be placed before F2 on the reactants side equation to make equation balanced? Xe + ___F2 &gt; XeF4
    15·2 answers
  • What dose plasma come from
    11·2 answers
  • Calculate the minimum mass of ammonia needed to produce 396 kg of ammonium sulfate, (NH4)2SO4, and excess sulfuric acid.
    5·1 answer
  • 14. Aluminum reacts with a certain unknown element (element X) to form the following formula. Which group must element X belong
    7·1 answer
  • HELP!!! The chemical formula is different from the empirical formula in
    13·2 answers
  • ANSWER ASAPP GIVING BRAINLIEST AND STUFF!
    12·1 answer
  • Genetic material (DNA) can be found in:
    9·2 answers
  • Please help me with this chem question
    15·1 answer
  • What are the words for each blank spot?
    8·2 answers
  • for each compound write a complete reaction equation showing the removal of the atoms that become the water molecule
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!