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
pishuonlain [190]
3 years ago
11

PLEASE HELP FOR 15 BRAINY POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Chemistry
1 answer:
evablogger [386]3 years ago
6 0

Answer:

i dont know sorry

Explanation:

You might be interested in
Describe how chemical substances are used based on their physical properties?
Lilit [14]
The answer is
Physical properties: Properties that do not change the chemical nature of matter
Chemical properties: Properties that do change tha chemical nature of matter

Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density. There are many more examples. Note that measuring each of these properties will not alter the basic nature of the substance.

Examples of chemical properties are: heat of combustion, reactivity with water, PH, and electromotive force.
3 0
3 years ago
A strontium-90 atom that has a lost two electrons has __________ protons, __________ neutrons, and __________ electrons.
MAXImum [283]
<span><em>Answer:</em>
A strontium-90 atom that has a lost two electrons has <u>38</u> protons, <u>52</u> neutrons, and <u>36</u> electrons.

<em>Explanation:
</em>Atomic number<em> of </em>Strontium (Sr) is 38. 
<em>Atomic number = number of protons 
</em>Hence, Strontium has 38 protons.

If the element is in neutral state,
                number of protons = number of electrons. 
Then, neutral Strontium atom should have 38 electrons. 
But the question says Sr has lost 2 electrons. Hence, number of electrons should be 38 - 2 = 36.

Mass number = number of protons + number of neutrons.

The given mass number is 90. Hence, number of neutrons should be 90 - 38 = 52.</span>
4 0
3 years ago
Nuclear energy comes from an atom's _____. <br><br> A. shells B. charge C. nucleus D. electrons
Shalnov [3]
This would be C. nucleus
4 0
3 years ago
Read 2 more answers
Calculate the number of grams of nitrogen dioxide that are produced from 4 moles of nitric oxide
miv72 [106K]

Answer:

hope this help by the way found off of yahoo

Explanation:

Calculate the number of grams of nitrogen dioxide that are produced from

4 moles of nitric oxide.

2NO(g) + O2(g) -->2NO2(g)

I really need help with this... I need to know how to work it too... I can balance it out but not sure about grams...  This is it balanced out with 4 moles of nitric oxide

4NO(g) + 2O2(g) ->4NO2(g) please help and explain i want to learn this

6 0
3 years ago
What is enthalpy?
White raven [17]
The awnser is A. Idek I looked it up so yeah that’s the awnser
7 0
3 years ago
Read 2 more answers
Other questions:
  • A scientific has a lot of support and is more than just a hunch
    8·2 answers
  • answer the following: a. Explain how a pulley changes the amount of force needed to lift an object. b. do all pulleys change the
    5·1 answer
  • How many atoms of gold (Au,196.97 g/mol) are in a gold nugget with a mass of 4.259?
    12·1 answer
  • A gas occupies 18.5L at stp. what volume will it occupy at 735 torr and 57°c?
    13·1 answer
  • The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0×10−13cm. The hydrogen atom itsel
    13·2 answers
  • a researcher finds 17grams of bromine will react with 3.404g of oxygen respectively. what is the mass of oxygen per one gram of
    14·1 answer
  • Multi-Step Conversions (Always go through moles!)
    7·1 answer
  • which energy source do you think has or could have the greatest positive impact on earth? explain your answer
    12·2 answers
  • If you had to choose,between cake/ice ,what do u thnk ppl will choose for a debate
    14·1 answer
  • How to convert 12g of H2O to moles
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!