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
Zarrin [17]
2 years ago
11

What is the charge on an ion with 21 protons, 30 neutrons, and 18 electrons.

Chemistry
1 answer:
Elis [28]2 years ago
5 0

Answer:

3+

Explanation:

Ignore neutrons.

Protons are positive and electrons are negative. To find a charge, it is protons minus electrons. In this atom, there are 21 protons and 18 electrons

21-18=3

Positive 3

You might be interested in
This drawing shows a human body system.
White raven [17]

Answer:

This question is incomplete

Explanation:

This question is incomplete because of the absence of the drawing  referred to in the question.

However, each option refers to a particular respiratory system and with the organs and the tissues mentioned here one can eventually identify which option is correct when the drawing is available.

A) The system described here is the cardiovascular system (or the circulatory system). This system involves the heart, blood vessels and the blood (which are what help in the transport of the materials mentioned in the question).

B) The system described here is the digestive system. This system involves the gastrointestinal tract and organs (that assist in the production/secretion or storage of chemicals that breakdown food into smaller pieces) such as the mouth, esophagus, stomach, small intestine, large intestine, rectum and the anus.

C) The system described here is the skeletal system. This system involves all the bones and joint in the body (the skeleton) which also helps in protecting organs in the body.

D) The system described here is the Endocrine system. This system involves several internal glands (such as the thyroid gland and the adrenal glands) in the body.

NOTE: Identify which organ and/or tissue is present in the diagram and use that to select the appropriate option from the description of each of the options provided above.

4 0
3 years ago
Read 2 more answers
What is a closed container in relation to the law of conservation of mass
MissTica
The law of conservation of mass<span> states that </span>mass<span> in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

</span>
5 0
3 years ago
How many kilobytes is 36 nibbles?
Deffense [45]

Answer:

<h2>                  †•°⁜Hewo there!⁜°•†</h2>

____________________________________________________________

<h3>                                         ¤0.018¤</h3>

____________________________________________________________

                               †•°-Love Ash or Ashlynn-°•†

                                  P.S (Have A great day!!)  

7 0
2 years ago
I need HELP!!!<br><br> Do the benefits of nuclear power outweigh the risks?
Georgia [21]
While there is no such thing as 100 percent safe, having nuclear energy is much safer than you think. It's thousands of times safer than conventional coal and other fossil-fuel-derived energy, not to mention the specter of environmental disaster from continued use of carbon-based energy sources.
3 0
3 years ago
Calculate δ h for the reaction:no (g) + o2 (g) ↔ no2 (g). given: 2o3(g) ↔ 3o2(g) δh=-426 kj o2(g) ↔ 2o(g) δh=+ 490 kj no(g) + o3
maks197457 [2]
To calculate the <span>δ h, we must balance first the reaction: 

NO + 0.5O2 -----> NO2

Then we write all the reactions,

2O3 -----> 3O2    </span><span>δ h = -426 kj        eq. (1)

O2 -----> 2O    </span><span>δ h = 490 kj             eq. (2)

NO + O3 -----> NO2 + O2    </span><span>δ h = -200 kj          eq. (3)


We divide eq. (1) by 2, we get

</span>O3 -----> 1.5O2    δ h = -213  kj             eq. (4)

Then, we subtract eq. (3) by eq. (4) 

NO + O3 ----->  NO2 + O2   δ h = -200 kj
-       (O3 -----> 1.5 O2         δ h = -213  kj)
NO -----> NO2 - 0.5O2        δ h = 13  kj               eq. (5)


eq. (2) divided by -2. (Note: Dividing or multiplying by negative number reverses the reaction)

O -----> 0.5O2  <span>δ h = -245  kj         eq. (6)
</span>
Add eq. (6) to eq. (5), we get

NO -----> NO2 - 0.5O2        δ h = 13  kj 
+  O -----> 0.5O2                 δ h = -245  kj
NO + O ----> NO2               δ h = -232 kj

<em>ANSWER:</em> <em>NO + O ----> NO2               δ h = -232 kj</em>


4 0
3 years ago
Other questions:
  • Observation And Assessment
    11·1 answer
  • The gas usually filled in the electric bulb is? 1.nitrogen 2.hydrogen 3.carbon dioxide 4.oxygen
    9·1 answer
  • If electricity cannot be destroyed or created then why do we got to pay for electricity?
    14·1 answer
  • 22)
    12·1 answer
  • Sodium is more reactive than magnesium. Give reason ​
    8·2 answers
  • How many moles of H2O can you make from 16 moles of NaOH
    8·1 answer
  • What do the red arrows represent
    6·1 answer
  • PLEASE HELPPPP
    5·1 answer
  • What is the percent yield of this reaction if 22.o g of Mgl2 is produced by the reaction of 25.0 g of Mg with 25.0 g of l2?
    5·1 answer
  • Identify the Brønsted–Lowry acid and the Brønsted–Lowry
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!