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
telo118 [61]
3 years ago
12

URGENT PLEASE ANSWER

Chemistry
1 answer:
Alona [7]3 years ago
5 0

Answer:

1. nucleus

2.14

3.14

4.3

5. 4+ or 4-

You might be interested in
1. An electric power plant uses energy from burning coal to generate steam at 450 °C. The plant is cooled by 20 °C water
kap26 [50]

Answer:

Explanation:

Efficiency of the electric power plant is e=1-\frac{T_{2}}{T_{1}}

Here Temperature of hot source T_{1} = 450^{o}C=450+273=723 K

and Temperature of sink T_{1} = 20^{o}C=20+273=293 K

Hence the efficiency is  e=1-\frac{293}{723}=0.5947=59.47%

Now another formula for thermal efficiency Is

e_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}

Here QI is the of heat taken from source 100 MJ ; Q2 of heat transferred to the sink (river) to be found

W is the of work done and W = QI -Q2

Hence Frome_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}

W=e(Q_{1})=(0.5947)(100)=59.47MJ

Hence the of heat transferred to the river Is Q_{2} -W = (100 -59.47=40.53

6 0
3 years ago
How do the greenhouse gases in earths atmosphere affect our environment ?
Law Incorporation [45]

certin greenhouse gasses poke hole in our Ozone layer which can lead to higher temps and bigger storms and longer droughts

8 0
3 years ago
Read 2 more answers
Does changing the number of neutrons change the identity of the element you have built ?
worty [1.4K]

Answer:

If you change the number of neutrons somehow, nothing will happen because it carry's no charge at all.

Explanation:

4 0
4 years ago
Why did the big bang not produce a significant proportion of elements heavier than helium?
Travka [436]

The big bang did not produce a significant proportion of elements heavier than helium because the temperatures and densities present in the early universe were not sufficient to support the fusion of heavier elements.

During the first few minute of the big bang, the universe was composed of mostly hydrogen and helium, with very small amounts of lithium and beryllium. As the universe expanded and cooled, the denser regions of the universe collapsed to form the first stars. Inside these stars, the intense pressure and heat generated by nuclear fusion reactions allowed for the production of heavier elements, such as carbon and oxygen. However, elements heavier than helium, such as iron and nickel, require even higher temperatures and densities to be produced, which can only be found in the cores of supernovae. Therefore, the big bang alone did not produce a significant proportion of elements heavier than helium.

to know more about compounds-

brainly.com/question/12166462

#SPJ4

7 0
1 year ago
An object moving at a constant velocity will always have a <br> .
I am Lyosha [343]
Hello, this is what u can write.
“An object moving with constant velocity must have a constant speed in a constant direction”
Hope this helps u :)
4 0
3 years ago
Read 2 more answers
Other questions:
  • 2.15 Liters of helium gas at a pressure of 58 kPa and a temperature of 25 degrees celsius, what is the new volume at stp?
    15·1 answer
  • How many grams is 3.35 moles of hcl
    15·1 answer
  • Needed help plzzz on this chemistry homework.
    13·1 answer
  • What are the number of atoms
    11·1 answer
  • a chemist studies two forms of refined gasoline. which of the following branches of chemistry might the chemist us?
    7·2 answers
  • To aid in pouring a liquid from wide-mouth container to small mouth container to filter substances when filter paper is used
    11·1 answer
  • The matter through which waves travel is called a/an​
    5·1 answer
  • What shows a reaction has occurred?
    13·1 answer
  • Please answer fast thank you!!!
    10·1 answer
  • Why alcohols have high boiling point​
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!