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
Norma-Jean [14]
3 years ago
5

An element has a half-life of 30 years. if 1.0 mg of this element decays over a period of 90 years, how many mg of this element

would remain?
Chemistry
1 answer:
labwork [276]3 years ago
6 0

Answer:

144.6

Explanation:

You might be interested in
Which statement identifies the element arsenic?
insens350 [35]

Answer : Option A) Atomic number of Arsenic is 33.


Explanation : Arsenic contains same number of protons in its atomic nucleus. In arsenic there are 33 protons found in the atomic nucleus. Hence, the atomic number will be 33. It has 5 valence electrons in its outermost shell, which is also called as valence shell. So, its valency becomes 5.

8 0
3 years ago
Read 2 more answers
The Groups 1 and 2 on the periodic table contain what atom type?
Bumek [7]
Non metals
and metals
8 0
3 years ago
Read 2 more answers
Help! giving brainliest
kirill [66]
It’s the 3d one


Good luckkkkkkkk
8 0
2 years ago
1.Give an example of a compound machine (1pt). Explain how at least two simple machines are part of this compound machine (2pts)
Law Incorporation [45]
1) An example of a compound machine could be a pair of Scissors. Their are two different simple machines in the Scissors which make up the compound machine. Both of them being a Lever, and a Fulcrum.

Hope this helps!
4 0
3 years ago
In air, a silver object can tarnish due to the reaction of silver with hydrogen sulfide, a gas found in the air as a result of c
cluponka [151]

Answer:

The coefficient of Ag is 2.

Explanation:

___Ag (s) + ___H₂S (g) ⇒ ___ Ag₂S (s) + ___ H₂(g)

The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "the mass is not created or destroyed, only transformed." This means that the reagents interact with each other and form new products with physical and chemical properties different from those of the reagents because the atoms of the substances are ordered differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the quantities of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.

In others words, the law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts :

Left side: 1 Ag, 2 H and 1 S

Right side: 2 Ag, 2 H and 1 S

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.  

You can see that the elements H and S are balanced because we have the same quantity on both sides of the reaction. Then you must balance the Ag, so the reaction is:

2 Ag (s) + 1 H₂S (g) ⇒ 1 Ag₂S (s) + 1 H₂(g)

Now you have:

Left side: 2 Ag, 2 H and 1 S

Right side: 2 Ag, 2 H and 1 S

So, you have the same amount of each element to both of the reaction and this is balanced.

Then, <u><em>the coefficient of Ag is 2.</em></u>

7 0
3 years ago
Other questions:
  • How does the periodic table arrange element's atomic number?
    7·1 answer
  • Which carboxylic acid has the lowest boiling point?
    6·1 answer
  • Why does a catalyst work for a long time before it needs replacing?
    7·1 answer
  • Hydrogen bonding among water molecules gives water all of the following important properties, except: strong cohesion among the
    5·1 answer
  • Which color of light bends the least when passing through a prism?
    13·1 answer
  • How many moles are there in 140.2 g of Ca
    10·2 answers
  • Iron(II) chloride is formed from the reaction between iron and copper(II) chloride. Fe + CuCl2 FeCl2 + Cu If the reactants have
    12·2 answers
  • Using the accepted value for the volume of 1 gram of water at the temperature of the room that you reported above, what is the a
    12·1 answer
  • What s the highest viscosity?
    5·2 answers
  • PLEASE HELP
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!