![subject](/tpl/images/cats/himiya.png)
Chemistry, 07.12.2020 20:00 StupidityIsKey
DESPERATE WILL GIVE BRAINLIST AND THANKS
The half-life of an element is 150 years. If a 40-gram sample was originally deposited, how much is left
after 300 years?
Question 4 options:
30 grams
20 grams
10 grams
5 grams
![ansver](/tpl/images/cats/User.png)
Answers: 3
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 08:30
Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 10:00
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? a) 6 b) 8 c) + 1 d) 12 e) 18
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 12:40
In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 15:20
Identify arrows pointing to bonding electrons. done h-0-0-h ) intro
Answers: 3
You know the right answer?
DESPERATE WILL GIVE BRAINLIST AND THANKS
The half-life of an element is 150 years. If a 40-gram sam...
Questions
![question](/tpl/images/cats/en.png)
English, 26.12.2020 14:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 26.12.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 26.12.2020 14:00
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/fizika.png)
Physics, 26.12.2020 14:00
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 26.12.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 26.12.2020 14:00
![question](/tpl/images/cats/himiya.png)
Chemistry, 26.12.2020 14:00
![question](/tpl/images/cats/en.png)
English, 26.12.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 26.12.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 26.12.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 26.12.2020 14:00
![question](/tpl/images/cats/mat.png)
Mathematics, 26.12.2020 14:00
![question](/tpl/images/cats/es.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 26.12.2020 14:00
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/en.png)
English, 26.12.2020 14:00
![question](/tpl/images/cats/istoriya.png)
History, 26.12.2020 14:00