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
Juliette [100K]
2 years ago
13

Identify the index fossil

Chemistry
1 answer:
Zina [86]2 years ago
5 0
It’s outcrop 3 and it’s the shark tooth because teeth help date fossils the best
You might be interested in
How many grams of agarose would you add to make 50ml of a 2 percent gel? why?
vodka [1.7K]
About 1 gram. 1 part of 50 is 2%
8 0
3 years ago
Sodium metal (Na) reacts explosively with water to form sodium hydroxide (NaOH) and hydrogen gas. How many moles of sodium are n
Sati [7]

Answer:

308 moles of sodium

Explanation:

The balanced equation for the chemical reaction between sodium metal (Na) and water (H₂O) is the following:

2 Na(s) + 2 H₂O → 2 NaOH(aq) + H₂(g)

From the equation, we can see that 2 moles of Na react with 2 moles of H₂O to give 2 moles of NaOH and 1 mol of H₂ (hydrogen gas). So the stoichiometric mole ratio between Na and H₂ is: 2 mol Na/1 mol H₂. Thus, we multiply the mole ratio by the moles of H₂ to be produced to obtain the moles of Na required:

moles of Na required =  2 mol Na/1 mol H₂ x 154 moles H₂ = 308 moles Na

Therefore, 308 moles of sodium are needed to produce 154 moles of hydrogen gas.

7 0
3 years ago
What is an electrolyte in an electrochemical cell?
Svet_ta [14]

Answer:

An electrolytic cell uses electrical energy to drive a non-spontaneous redox reaction. An electrolytic cell is a kind of electrochemical cell. ... The electrolyte is usually a solution of water or other solvents in which ions are dissolved. Molten salts such as sodium chloride are also electrolytes.

Explanation:

6 0
3 years ago
Read 2 more answers
What describes a change that occurs when one substance reacts to another substance?
Slav-nsk [51]
A chemical or physical change
8 0
3 years ago
Day and night are caused by what
Aleks04 [339]

Answer:

THE GOD ALMIGHTY!

Explanation:

6 0
3 years ago
Other questions:
  • 1)The average lethal dose of Valium is 1.52 mg/kg of body weight. Estimate how many grams of Valium would be lethal for a 200.-l
    5·1 answer
  • Which statement accurately describes global warming?
    6·2 answers
  • ) The student collects the H2(g) produced by the reaction and measures its volume over water at 298 K after carefully equalizing
    14·1 answer
  • Which of the following distinguishes an element from all other elements?
    9·1 answer
  • Help me please ...online claases got me crazy
    5·1 answer
  • In the reaction H2SO4 + 2 NaOH -> Na2SO4 + 2H2O, an equivalence point occurs when 23.1 mL of 0.2055 M NaOH is added to a 25.0
    10·1 answer
  • the diagram below represents two beakers, each containing an ice cube and clear liquid. in beaker A the ice cube floats, and in
    13·1 answer
  • A car moved 20km East and 70km West. What is the distance?
    5·1 answer
  • Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137 is 30.2 years. How much tim
    15·1 answer
  • A glass tube contains mercury. What would be the height of the column of mercury which would create pressure equal to 1.00 atm
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!