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
Ber [7]
3 years ago
8

I find that there are 500 atoms of U-235 and 1500 atoms of Pb-207. If we assume the mineral contained only parent and no daughte

r, then how many atoms of these elements were in the mineral when the rock first formed?
Chemistry
1 answer:
swat323 years ago
3 0

Explanation:

From the question it can be infered that initially only parent atoms were present in the rock and  no daughter atom. So, initially there was only uranium atom and no lead atom. So, in total there were 500+1500= 2000 uranium atom. And no lead tom was there.

You might be interested in
Water vapor forming droplets that form clouds directly involve which process
Vinvika [58]
It is formed when water vapor condenses.
5 0
3 years ago
Where does the rest of the energy “lost” go? <br> (In food webs)
Blizzard [7]

Explanation:

The rest of the energy is passed on as food to the next level of the food chain. The figure at the left shows energy flow in a simple food chain. Notice that at each level of the food chain, about 90% of the energy is lost in the form of heat.

3 0
3 years ago
Read 2 more answers
Which element from the periodic table has four valence electrons
Ivahew [28]

carbon has 4 valence electrons

6 0
3 years ago
Read 2 more answers
What is the main point of mutation ? <br> quick please !!
Ede4ka [16]

Answer: type of mutation that causes the replacement of a single base nucleotide with another nucleotide of the genetic material, DNA or RNA. The term point mutation also includes insertions or deletions of a single base pair.

Explanation:

5 0
3 years ago
Read 2 more answers
A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final
KATRIN_1 [288]

Answer : The initial temperature of the limestone is 1.05\times 10^{2}^oC.

Solution : Given,

Mass of limestone = 62.6 g

Mass of water = 75 g

Final temperature of limestone = 51.9^oC

Final temperature of water = 51.9^oC

Initial temperature of water = 23.1^oC

The specific heat capacity of limestone = 0.921J/g^oC

The specific heat capacity of water = 4.186J/g^oC

The formula used :

q = m × c × ΔT

where,

q = heat required

m = mass of an element

c = heat capacity

ΔT = change in temperature

According to this, the energy as heat lost by the system is equal to the gained by the surroundings.

Now the above formula converted and we get

q_{system}=-q_{surrounding}

m_{system}\times c_{system}\times (T_{final}-T_{initial})_{system}= -[m_{surrounding}\times c_{surrounding}\times (T_{final}-T_{initial})_{surrounding}]

m_{limestone}\times c_{limestone}\times (T_{final}-T_{initial})_{limestone}= -[m_{water}\times c_{water}\times (T_{final}-T_{initial})_{water}]

Now put all the given values in this formula, we get

62.6g\times 0.921J/g^{0}C \times (51.9^{0}C-T_{\text{ initial limestone}})= -[75g\times 4.186J/g^{0}C \times (51.9^{0}C-23.1^oC)]

By rearranging the terms, we get  the value of initial temperature of limestone.

T_{\text{ initial limestone}}=104.926^{0}C=1.05\times 10^{2}^oC

Therefore, the initial temperature of the limestone is 1.05\times 10^{2}^oC.




8 0
3 years ago
Read 2 more answers
Other questions:
  • The process to separate the various components of a liquid mixture is fractional distillation. True False
    15·1 answer
  • A train in Japan can travel 813.5 miles in 5 hours
    14·1 answer
  • Why are nonvascular plants found in moist enviroments?
    15·2 answers
  • A way of classifying organisms that uses all the evidence known about organisms is called a?
    5·1 answer
  • Hey, please could someone answer this?
    11·1 answer
  • Given the following reaction and data, A + B → Products
    8·1 answer
  • Some one please help me name the following compound CsCrO4​
    9·1 answer
  • A roller coaster is accelerating at 10m/s² before it comes to an abrupt stop at the end of the ride. The mass of the roller coas
    9·1 answer
  • What is the gravitational potential energy of a 5 kg object that is 150
    7·2 answers
  • Part B
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!