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
mr Goodwill [35]
2 years ago
12

does anyone know the three answers Question 1 which element is in group 5 period 2?, question 3 which element is in group 6 peri

od 2?, question 4 which element is in group 8 period 1? this IPC it is both Integrated Physics and Chemistry
Chemistry
2 answers:
MrRa [10]2 years ago
4 0

Explanation:

1. Nitrogen

3. Oxygen

4. Helium

trapecia [35]2 years ago
3 0

look into the periodic system

question 1: nitrogen

question 3: oxygen

question 4: helium

You might be interested in
Two scientists are debating how to classify a new animal species that they have discovered. They observe that the animal is capa
BaLLatris [955]

Answer:

A

Explanation:

7 0
3 years ago
Read 2 more answers
A 40.04 g sample of a protein contains 17.16 g of carbon, 3.17 g of hydrogen, 13.71 g of oxygen, and the rest being nitrogen. Th
Arturiano [62]

Answer:

ffgghhhhhgffffffcvvvvvvvvvvvvvvvvvv

Explanation:

cccvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

8 0
3 years ago
What does the second law of thermodynamics say about entropy
alukav5142 [94]

Answer:

The entropy and the systems surrounding it tend to increase.

5 0
3 years ago
Read 2 more answers
Propane (c3h8) is burned in oxygen to produce carbon dioxide and water. the heat of combustion of propane is -2012 kj/mole. how
Olegator [25]
C_{3} H_{8} + 5 O_{2} ---\ \textgreater \  3CO_{2}  +4H_{2}O    (-2012 \frac{kJ}{mol} )


3 mol                10 mol


C_{3}H_{8} is /excess /reactant

because 3 mol propane require 15 mol oxygen (by reaction)

5 mol oxygen ---1 mol propane, so

10 mol oxygen ---2 mol propane

Only 2 mole propane will be burned,

so 

2012 ( kJ/mol)*2 mol =4024 KJ heat will be given off

Correct answer is number 4.



5 0
3 years ago
The activation energy of an endothermic reaction _____.
Anon25 [30]
Endothermic reactions are reactions that require heat in the course of the process. The heat of reaction in this case is positive which means the energy of the products is greater than the energy of the reactants. In this case, the answer to this problem would have to be <span>1. must be greater than the required ΔH </span>
3 0
3 years ago
Read 2 more answers
Other questions:
  • An adult rhino xan have a mass of 1400 kg the mass of a small egret is about 0.76kg. what is the radio of these two masses? how
    11·1 answer
  • If a hypothesis can stand the test of repeated examination, it can become a _____.
    10·2 answers
  • In a reduction half-reaction, which amount is shown?
    10·1 answer
  • Sedimentary rocks formed from the remains of once-living things are
    10·2 answers
  • A 155g sample of an unknown substance was; heated from 25.0°c to 40°c. In the process, the substance absorbed 2085 J of energy.
    7·1 answer
  • Which are factors of coastal erosion? (Choose -
    5·1 answer
  • C + 2ZnO → CO2 + 2zn
    15·1 answer
  • PLEASE ASAP <br> HELP!!!!!!!!
    14·2 answers
  • Can i have someone do this its my birthday and im giving a brainlist
    7·1 answer
  • Help please! I dont understand, and im having a hard time in Science.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!