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
weqwewe [10]
3 years ago
13

When must scientist conduct controlled experiments ?

Chemistry
1 answer:
iVinArrow [24]3 years ago
8 0
Usually when scientist wants to test whether one compound or one phenotype is related to another phenotype. Then they need to control this variable when conducting experiments.
You might be interested in
What element have 3 PELS?
qaws [65]

Answer:

boron aluminum gallium indium

Explanation:

hope this helps you

4 0
3 years ago
Calculate the pressure, in atmospheres, required to compress a sample of helium gas from 27.3 L (at 1.00 atm) to 3.36 L at const
inn [45]

Answer:

8.125 atm

Explanation:

Hello,

Boyle's law states that at constant temperature:

P_1V_1=P_2V_2

In this case:

P_1=1 atm, V_1=27.3L, V_2=3.36L

Solving for P_2:

P_2=\frac{P_1V_1}{V_2}=\frac{1atm*27.3L}{3.36L}\\P_2=8.125atm

Best regards!

4 0
3 years ago
Pls help
Simora [160]

Heat required to raise the temperature = 159.505 J

<h3>Further explanation</h3>

Given

c = specific heat of Beryllium = 1.825 J/g C

m = mass = 2.3 g

Δt = Temperature difference : 60 - 22 = 38 °C

Required

Heat required

Solution

Heat can be formulated

Q = m.c.Δt

Input the value :

Q = 2.3 x 1.825 x 38

Q = 159.505 J

8 0
3 years ago
A patient taking _______ would have a history of mental depression.
ohaa [14]
The answer is Prozac
4 0
3 years ago
The solubility of nitrogen gas at 25 degrees C and 1 atm is 6.8 x 10^(-4) mol/L. If the partial pressure of nitrogen gas in air
Zolol [24]

Answer:

5.2 x 10⁻⁴ M.

Explanation:

  • The relationship between gas pressure and the  concentration of dissolved gas is given by  Henry’s law:

<em>P = kC</em>

where P is the partial pressure of the gaseous  solute above the solution.

k is a constant (Henry’s constant).

C is the concentration of the dissolved gas.

  • At two different pressures, there is two different concentrations of dissolved gases and is expressed in a relation as:

<em>P₁C₂ = P₂C₁,</em>

P₁ = 1.0 atm, C₁ = 6.8 x 10⁻⁴ mol/L.

P₂ = 0.76 atm, C₂ = ??? mol/L.

<em>∴ C₂ = (P₂C₁)/P₁ =</em> (0.76 atm)(6.8 x 10⁻⁴ mol/L)/(1.0 atm) = <em>5.168 x 10⁻⁴ mol/L ≅ 5.2 x 10⁻⁴ M.</em>

5 0
3 years ago
Other questions:
  • A. Use average bond energies together with the standard enthalpy of formation of C(g) (718.4 kJ/mol ) to estimate the standard e
    11·1 answer
  • [cu(nh3)4]2 forms a blue solution. when concentrated hcl is added to this solution, what color will the solution change to
    14·2 answers
  • What is the name of the chemical formula Ti3(PO4)2
    9·1 answer
  • If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a
    5·2 answers
  • Calculate the heat necessary to raise the temperature of 40.0 g of aluminum from 20.0 C to 700.0 C
    10·2 answers
  • Which property of a substance can be determined using a pH indicator?
    15·2 answers
  • If you are given a chemical equation and specific amounts for each reactant in grams, how would you determine how much product c
    12·1 answer
  • fluorine gas and water vapor react to form hydrogen fluorine gas and oxygen what volume of hydrogen fluorine would be produced b
    11·1 answer
  • During a chemical reaction, the amount of energy
    6·1 answer
  • How did the development of the earliest idea about atoms differ from the later work of scientists?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!