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
Zolol [24]
4 years ago
9

For question #12, use the following picture: 12. What element is this? How do you know?

Chemistry
2 answers:
labwork [276]4 years ago
8 0

Answer: The element shown in the image is Helium (He).

Explanation: We are given a image of an atom having protons, neutrons and electrons.

Number of protons as shown in image = 2

Number of neutrons as shown in image = 2

Number of electron as shown in image = 2

Atomic number = Number of protons = Number of electrons

Atomic number of the element = 2

Atomic Mass = Number of protons + Number of neutrons

Atomic mass = 2 + 2 = 4

The element having Atomic number = 2 and mass number = 4 is Helium.

Element = ^4_2\textrm{He}

morpeh [17]4 years ago
3 0
I believe the element is Helium. I know this because an atom of helium has an atomic number of 2, meaning it has 2 protons. Because it is an atom of helium and not an ion of helium it also possess the same number of electrons as well which is 2.
You might be interested in
What are some temperature change chemica reaction equations ?
Zinaida [17]

Answer:

The heating and melting of wax

Explanation:

When a candle is burned the wax heats up, but when cooled it hardens and cannot be put back into it original form.

Hope this helps

Please mark me as Brainliest

7 0
3 years ago
Match the word with its definition.
DiKsa [7]
Mass = that which causes and object to have inertia

Newton’s First Law= a special case of Galileo’s Law of Inertia

Impulse= force multiplied by time

Momentum= velocity multiplied by mass

Velocity= momentum/mass

Newton’s Second Law= the acceleration of a mass directly proportional to the force acting on it
7 0
4 years ago
Read 2 more answers
Convert 0.0035 weeks into seconds.
Vesnalui [34]

Answer: 2116.8 seconds

Explanation:

0.0035 weeks × 7days/week × 24hrs/day × 60min/hr × 60sec/min

=2116.8 seconds

=2100 (if you are required to consider significant figures)

7 0
3 years ago
Read 2 more answers
What volume of 0.0250 m calcium hydroxide is required to neutralize 33.50 ml of 0.0200 m nitric acid?
natta225 [31]
The chemical formula for calcium hydroxide is Ca(OH)₂ and that of nitric acid is HNO₃. By these chemical formula it can be deduced that the number of equivalents per mole of Ca(OH)₂ is 2 because of 2 OH⁻ and for HNO₃ is 1 because of H⁺.

For the neutralization reaction, the number of equivalents should be equal. 
             V₁n₁ = V₂n₂

Substituting the known values and with the incorporation of the concept above,
     (V₁)(0.0250 mol/L)(2 equivalents/mol) = (33.50 mL)(0.020 mol/L)(1 equivalent/mol)

         V₁ = 13.4 mL

Hence, the volume of calcium hydroxide needed is approximately equal to 13.4 mL. 
3 0
4 years ago
What precipitate forms when silver nitrate and potassium chromate solutions are mixed? Explain.
weeeeeb [17]

Answer: a. Ag_2CrO_4( s)

Explanation:

2AgNO_3(aq)+K_2CrO_4(aq)\rightarrow Ag_2CrO_4(s)+2KNO_3(aq)

When silver nitrate AgNO_3 combines with potassium chromate K_2CrO_4(aq) ,they undergo double displacement reaction in which exchange of ions take place.

The products formed are silver chromate Ag_2CrO_4 which is insoluble in water and thus formed as precipitate and potassium nitrate KNO_3(aq)is soluble in water.


3 0
4 years ago
Other questions:
  • Mosquitoes lays eggs that must hatch in water. The young, called larvae live their first few days in water
    15·1 answer
  • If the heat of fusion of water is 3.4 × 102 j/g, the amount of heat energy required to change 15.0 grams of ice at 0°c to 15.0 g
    15·1 answer
  • Which is an example of a mixture made of parts that can easily be separated?
    14·2 answers
  • Consider the reaction.
    13·1 answer
  • Glycolysis is the process by which energy is harvested from glucose by living things. Several of the reactions of glycolysis are
    14·1 answer
  • What occurs to the particles in a fluid during convection ?
    5·1 answer
  • What type of energy must you add to a substance to make the particles of the substance
    15·2 answers
  • When an atom _________<br> an electron, it charge is positive.
    11·1 answer
  • Write the electronic configuration of 6c element and state the group,period to which it belongs<br>​
    15·1 answer
  • When calcium carbonate reacts with hydrochloric acid, calcium ions are transferred to the solution. Write only one net ionic equ
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!