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xz_007 [3.2K]
3 years ago
12

I need to write a conclusion for this!i need help plz

Chemistry
1 answer:
pickupchik [31]3 years ago
4 0
What's the theme or point?
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Which statement best describes the variables in a controlled experiment?
RUDIKE [14]

The statement that best describes the variables in a controlled experiment is independent variable while all other conditions are unchanged.

<h3>What is an experiment?</h3>

An experiment is a scientific research, findings or investigation about a subject matter with the aim of validating a claim and establishing theories.

A controlled experiment refers to an experiment in which the variables involved and the control factor are kept in the same group except for one variable which can be changed.

Therefore, The statement that best describes the variables in a controlled experiment is independent variable while all other conditions are unchanged.

Learn more about experiment below.

brainly.com/question/25303029

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8 0
3 years ago
Describe a method to calculate the average atomic mass of using only the atomic masses of
AnnZ [28]

Answer:

Average amu is 6.52556

Explanation:

Average the numbers

Add the two masses together.

6.01512+ 7.01600= 13.03112

Then divide by 2, we divide by 2 because that is how many #'s we are given.

13.03112/ 2= 6.52556

6 0
3 years ago
Which of these elements is a transition metal? francium (Fr) beryllium (Be) chromium (Cr) gallium (Ga) bismuth (Bi)
vitfil [10]
I believe the correct answer from the choices listed above is the third option. It would be chromium (Cr) that is a transition metal. The 38 elements in groups 3 through 12 of the periodic table are called "transition metals<span>". Hope this answers the question. Have a nice day.</span>
8 0
3 years ago
A 10.0 gram sample of Fe contains how many miles of Fe
Dafna1 [17]

Answer:

1.7857 moles

Explanation:

moles=mass/Mr

10/56=1.7857

moles of iron =1.7857

4 0
2 years ago
A sample of He at 25C and 755 torr occupies a fixed volume of 16.8L. What mass of He must be pumped in to increase the pressure
AURORKA [14]

Answer:

2.4 g

Explanation:

Step 1: Given data

  • Initial pressure (P₁): 755 torr
  • Volume (V): 16.8 L
  • Temperature (T): 25 °C
  • Final pressure (P₂): 1.87 atm

Step 2: Convert "P₁" to atm

We will use the conversion factor 1 atm = 760 torr.

755 torr × 1 atm/760 torr = 0.993 atm

Step 3: Convert "T" to K

We will use the following expression.

K = °C + 273.15

K = 25°C + 273.15 = 298 K

Step 4: Calculate the initial number of moles of He

We will use the ideal gas equation.

P₁ × V = n₁ × R × T

n₁ = P₁ × V/R × T

n₁ = 0.993 atm × 16.8 L/(0.0821 atm.L/mol.K) × 298 K

n₁ = 0.682 mol

Step 5: Calculate the final number of moles of He

We will use the ideal gas equation.

P₂ × V = n₂ × R × T

n₂ = P₂ × V/R × T

n₂ = 1.87 atm × 16.8 L/(0.0821 atm.L/mol.K) × 298 K

n₂ = 1.28 mol

Step 6: Calculate the moles of He added

n = n₂ - n₁

n = 1.28 mol - 0.682 mol

n = 0.60 mol

Step 7: Convert "n" to mass

The molar mass of He is 4.00 g/mol

0.60 mol × 4.00 g/mol = 2.4 g

8 0
3 years ago
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