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
kipiarov [429]
3 years ago
13

Pick the correct statement for the following isotope: 42Ca

Chemistry
1 answer:
Valentin [98]3 years ago
5 0

Answer:

42 is the mass number and 20 is the atomic number.

Explanation:

The mass number of an element is written at the upper left side of the symbol of the element, and the atomic number is written at the lower left side of the symbol.

You might be interested in
The equilibrium expression for kp for the reaction below is __________. n2 (g) o2 (g) 2no (g)
PolarNik [594]
For the reaction;
N2(g) + O2(g) = 2NO(g)

Kp = pNO²/ pN₂pO₂; (No units)
where;
pNO is the partial pressure of NO;
pN₂ is the partial pressure of nitrogen
pO₂ is the partial pressure of Oxygen
The equilibrium constant  Kp is deduced from the balanced chemical equation for a reversible reaction, NOT experimental data as is the case for rate expressions in kinetics. 
Kp changes with temperature considerably changing the position of an equilibrium, and, at a constant temperature, and therefore constant K, the position of an equilibrium can change significantly depending on relative concentrations/pressures of 'reactants' and 'products'.
8 0
3 years ago
Why do plants cells Need chloroplast? put it in your own words
pentagon [3]

Answer:

I hope this helps u out a bit its my own words

Explanation:

Plant cells use chloroplast as kind of an extra mitochondria in a plant cell. They work together, when a chloroplast gets food through photosynthesis the mitochondria breaks down that food and distributes it through the cell.

3 0
4 years ago
Read 2 more answers
Please answer fast!
Over [174]

Explanation:

they are located in the neucleus

4 0
4 years ago
What does the t cell do to your body?
lawyer [7]

Answer:  it's part of the immune system that focuses on specific foreign particles. Rather than generically attack any antigens, T cells circulate until they encounter their specific antigen. As such, T cells play a critical part in immunity to foreign substances !

Explanation:

4 0
3 years ago
Which of the following compounds has the highest boiling point?
anastassius [24]

Answer:

Butanoic acid

Explanation:

7 0
4 years ago
Other questions:
  • What happens when a Bose-Einstein condensate forms?
    15·1 answer
  • What is the chemical name for N2O3?
    13·2 answers
  • When nickel metal is added to silver nitrate in solution, silver metal and nickel (II) nitrate are
    11·1 answer
  • Read this for the next two problems: When a 125 g obsidian rock is placed into a graduated
    15·1 answer
  • 21. The scientists who signed the petition believed that
    15·1 answer
  • So I am lost and I don't know how what any of those conversion factor things are and I'm wondering how to do #2,3, and 4. (I did
    14·1 answer
  • The plastics industry realized more than 20 years ago that recycling plastics was a necessity for our planet. Can you recognize
    12·1 answer
  • To find time, t, the age of the universe, you must first isolate the variable t. Rewrite the velocity equation v = d / t so that
    11·1 answer
  • Help please i need it
    11·2 answers
  • ( THANKS AND BRAINLIEST! )
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!