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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.
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4. The type of thermal energy transfer that heats our homes is called
andrew-mc [135]

Answer:

conduction is the answer

6 0
2 years ago
Calculate the number of Li atoms in 7.8 mol of Li.
Gwar [14]
<h3>Answer:</h3>

4.7 × 10²⁴ atoms Li

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

7.8 mol Li

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. Set up:                              \displaystyle 7.8 \ mol \ Li(\frac{6.022 \cdot 10^{23} \ atoms \ Li}{1 \ mol \ Li})
  2. Multiply/Divide:                \displaystyle 4.69716 \cdot 10^{24} \ atoms \ Li

<u>Step 4: Check</u>

<em>We are told to round to 2 sig figs. Follow sig fig rules and round.</em>

4.69716 × 10²⁴ atoms Li ≈ 4.7 × 10²⁴ atoms Li

6 0
2 years ago
Which family (metals, nonmetals, or inert gases) generally has the valence electrons which are the easiest to remove from the at
zubka84 [21]
<span>Which family (metals, nonmetals, or inert gases) generally has the valence electrons which are the easiest to remove from the atom?
</span>
The Correct Answer Is:  Metals

Hope I Helped :D

Brainliest?


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4 0
3 years ago
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What is an individual living entity called?
Citrus2011 [14]

Answer:

it is organism the third one

4 0
3 years ago
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How do thermal energy and intermolecular forces behave with each other?
julia-pushkina [17]
When there is more thermal energy, there are less intermolecular forces. I hope this answers your question ☺️☺️
5 0
3 years ago
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