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
Lapatulllka [165]
4 years ago
8

What is a level 7-8 grade science fair project I can do?

Chemistry
1 answer:
Delicious77 [7]4 years ago
4 0
Making an atom or a virus structure
You might be interested in
19
Yuki888 [10]

Answer:

The electron took two jumps to return to its ground state.

Explanation:

If the electron is in nth state then it first goes to (n-1)th to 2nd state and emits one photon of this energy gap. Then, it goes to ground state and emits another photon of different energy. It can emit \left \{ {{n-1} \atop {2}} \right. types of different photons. Fourth option is incorrect because in that case it emits one photon and absorbs one photon to go back to that state and also both photons are of same energy.

7 0
4 years ago
Which of the following does NOT show the law of conservation of mass?
algol [13]
I think the correct answer from the choices listed above is option B.  <span>24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO </span>does not show the law of conservation of mass. Volumes cannot be added because there are volume effects when you add different substances. So, the reactants is not equal to the product.
4 0
4 years ago
Read 2 more answers
Which equation best describes the net changes based upon the observation that solid silver nitrate and solid potassium chloride
stealth61 [152]

Answer:

The correct option is: AgNO₃(aq) + KCl(aq) = AgCl(s) + KNO₃(aq)  

Explanation:

Precipitation reaction is a chemical reaction that involves reaction between <em>two soluble salts to give an insoluble salt.</em> This <u>insoluble salt exists as a solid</u> and settles down.

Therefore, the solid formed in a precipitation reaction is known as the precipitate.  

As the solid silver nitrate (AgNO₃) and solid potassium chloride (KCl) are <u>soluble in water</u>, therefore, their aqueous solutions are represented as AgNO₃(aq) and KCl(aq), respectively.

The precipitation reaction of AgNO₃(aq) and KCl(aq) gives an <u>insoluble salt, silver chloride (AgCl) and a soluble salt, potassium nitrate (KNO₃).</u>

The insoluble salt, <u>AgCl is called the precipitate</u> and is represented as AgCl(s). Whereas, the <u>soluble salt</u>, KNO₃ is represented as KNO₃ (aq).

<u>Therefore, the chemical equation for this precipitation reaction is:</u>

AgNO₃(aq) + KCl(aq) → AgCl(s) + KNO₃(aq)

6 0
3 years ago
The discovery of a very early form of helium supports the big bang theory because _____.
Amiraneli [1.4K]

Answer:

The discovery of early helium supports the Big Bang Theory because helium is something that would have been a product of a large explosion. Helium is also the most proliferate element in the universe.

Explanation:

. . . . .. . . . . . . . . . . ,.-‘”. . . . . . . . . .``~.,

. . . . . . . .. . . . . .,.-”. . . . . . . . . . . . . . . . . .“-.,

. . . . .. . . . . . ..,/. . . . . . . . . . . . . . . . . . . . . . . ”:,

. . . . . . . .. ...,/. . . . . . . . . . . . . . . . . . . . . . . . . . .\,

. . . . . . . . . /. . . . . . . . . . . . . . . . . . . . . . . . . . . . ,}

. . . . . . . . ./. . . . . . . . . . . . . . . . . . . . . . . . . . ,:`^`.}

. . . . . . . ./. . . . . . . . . . . . . . . . . . . . . . . . . ,:”. . . ./

. . . . . . .../. . . __. . . . . . . . . . . . . . . . . . . . :`. . . ./

. . . . . . . /__.(. . .“~-,_. . . . . . . . . . . . . . ,:`. . . .. ./

. . . . . . /(_. . ”~,_. . . ..“~,_. . . . . . . . . .,:`. . . . _/

. . . .. .{.._$;_. . .”=,_. . . .“-,_. . . ,.-~-,}, .~”; /. .. .}

. . .. . .((. . .*~_. . . .”=-._. . .“;,,./`. . /” . . . ./. .. ../

. . . .. . .\`~,. . ..“~.,. . . . . . . . . ..`. . .}. . . . . . ../

. . . . . .(. ..`=-,,. . . .`. . . . . . . . . . . ..(. . . ;_,,-”

. . . . . ../.`~,. . ..`-.. . . . . . . . . . . . . . ..\. . /\

. . . . . . \`~.*-,. . . . . . . . . . . . . . . . . ..|,./.....\,__

,,_. . . . . }.>-._\. . . . . . . . . . . . . . . . . .|. . . . . . ..`=~-,

. .. `=~-,_\_. . . `\,. . . . . . . . . . . . . . . . .\

. . . . . . . . . .`=~-,,.\,. . . . . . . . . . . . . . . .\

. . . . . . . . . . . . . . . . `:,, . . . . . . . . . . . . . `\. . . . . . ..__

. . . . . . . . . . . . . . . . . . .`=-,. . . . . . . . . .,%`>--

6 0
3 years ago
Read 2 more answers
Will mark brainliest!
aniked [119]
The decoders of the DNA messege
4 0
4 years ago
Other questions:
  • When a 1.0 M solution of HCl is titrated with a 1.0 M solution of KOH, which is the approximate pH at the equivalent point?
    11·1 answer
  • Write empirical formula
    8·1 answer
  • A-Its energy increased
    15·1 answer
  • You are asked to prepare 500 mL 0.300 M500 mL 0.300 M acetate buffer at pH 4.904.90 using only pure acetic acid ( MW=60.05 g/mol
    12·1 answer
  • Match each vocabulary word with the correct definition.
    12·2 answers
  • HELP<br> The Earth's tilt causes _____.<br><br> years<br> seasons<br> day and night<br> time zones
    6·1 answer
  • nonmetals and metals do different things when it comes to their valence electrons. one seeks to gain and the other lose. which i
    5·1 answer
  • Balance the following equations and write the corresponding ionic and net ionic equations (if appropriate):
    10·1 answer
  • Which two elements are combined in sodium chloride
    13·2 answers
  • If 77.5 g NH3 reacts with excess O2, what volume of NO is produced at STP?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!