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
nlexa [21]
3 years ago
12

What is a ‘control’ in an experiment?

Chemistry
2 answers:
Over [174]3 years ago
7 0

D. The name for the set of independent and dependent variables that will be controlled by the scientist.

tensa zangetsu [6.8K]3 years ago
3 0

Answer:

The answer fo this is D because of the person controlling the outcome for both variables

You might be interested in
A 0.529-g sample of gas occupies 125 ml at 60. cm of hg and 25°c. what is the molar mass of the gas?
Llana [10]

<span>Let's </span>assume that the gas has ideal gas behavior. <span>
Then we can use ideal gas formula,
PV = nRT<span>

</span><span>Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol</span></span>⁻¹ K⁻¹) and T is temperature in Kelvin.<span>
<span>
</span>P = 60 cm Hg = 79993.4 Pa
V = </span>125  mL = 125 x 10⁻⁶ m³

n = ?

<span> R = 8.314 J mol</span>⁻¹ K⁻¹<span>
T = 25 °C = 298 K
<span>
By substitution,
</span></span>79993.4 Pa<span> x </span>125 x 10⁻⁶ m³ = n x 8.314 J mol⁻¹ K⁻¹ x 298 K<span>
                                          n = 4.0359 x 10</span>⁻³ mol

<span>
Hence, moles of the gas</span> = 4.0359 x 10⁻³ mol<span>

Moles = mass / molar mass

</span>Mass of the gas  = 0.529 g 

<span>Molar mass of the gas</span> = mass / number of moles<span>
                                    = </span>0.529 g / 4.0359 x 10⁻³ mol<span>
<span>                                    = </span>131.07 g mol</span>⁻¹<span>

Hence, the molar mass of the given gas is </span>131.07 g mol⁻¹

4 0
3 years ago
Bond length is the distance between the centers of two bonded atoms. on the potential energy curve, the bond length is the inter
Alisiya [41]

Answer:Hence, the bond length in HCl is 125 pm.

Explanation:

Bond length : It is an average distance between the nuclei of two bonded atoms in a molecule.

Also given that bond length is the distance between the centers of two bonded atoms. on the potential energy curve, the bond length is the inter-nuclear distance between the two atoms when the potential energy of the system reaches its lowest value. Beyond this if atoms come closer to each other then their will be repulsion between them.

So, the bond length between the Hydrogen and Chlorine atom in HCl molecule is :

Bond length=radius _{hydrogen}+radius_{chlorine}=25pm+100pm=125pm

Hence, the bond length in HCl is 125 pm.

5 0
3 years ago
Read 2 more answers
How does the distance between the planet Earth and the Sun compare with the distances between the planet Earth and other stars?
Paha777 [63]
I think C, but I could be wrong
7 0
3 years ago
Read 2 more answers
Identify if the following are chemical or physical properties: "CP" for
mel-nik [20]

Answer:

1.pp

2.cp

3.pp

4.pp

5.pp

6.pp

8 0
3 years ago
Describe two situations that reduce the dissolved oxygen content of water?
Olin [163]
Hi sweetie, hope this helps!

The more salt that is dissolved in the water, the less oxygen will be dissolved in it.

The higher the temperature of the water, the less oxygen will be dissolved it in.


Goodluck!,
Izzy
4 0
3 years ago
Other questions:
  • What is the mass of 1.75 moles of zinc atoms?
    13·1 answer
  • Calculate ΔrG∘ at 298 K for the following reactions.CO(g)+H2O(g)→H2(g)+CO2(g)2-Predict the effect on ΔrG∘ of lowering the temper
    6·1 answer
  • What is ΔG for the reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50
    9·1 answer
  • Find the number of moles of CO2− 3 produced when 0.207 mol of sodium carbonate dissolved. Answer in units of mol.
    7·1 answer
  • The ph of a fruit juice is 3.43.4. find the hydronium ion​ concentration, left bracket upper h 3 upper o superscript plus right
    15·1 answer
  • Drag the tiles to the correct boxes to complete the pairs.
    11·1 answer
  • A container holds 1 mole of helium gas. The volume of the container is 2 liters and the pressure inside the container is 105.0 k
    11·1 answer
  • How many molecules are there in 13.5g of lithium oxide?<br><br>please help! ​
    9·2 answers
  • Ocean water density varies more at the the poles throughout the year than at the equator.
    9·1 answer
  • Match the following layer with its definition .
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!