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3 years ago

13

If a solution conducts electricity, it is positive evidence that

1 answer:

BlackZzzverrR [31]3 years ago

3 0

Answer:

If a solution conducts electricity, it is positive evidence that solute dissolved in solvent is electrolyte.

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A standard drink of beer is _ ounces.

kiruha [24]

A standard drink of beer is 12 ounces

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Compute 9.3456+2140.56. Round the answer appropriately.

vichka [17]

This is just addition. Put 2140.56 on top, line up 9.3456 under it appropriately. Doing this will give you the answer: 2149.9056

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3 years ago

NaBr + CaF2 → NaF + CaBr2 What coefficients are needed to balance the chemical equation? A) 1,1,1,1 B) 1,2,1,2 C) 1,2,2,1 D) 2,1

elena-s [515]

D.
2NaBr + CaF2 --> 2NaF + CaBr2 gives you:

2Na 2Na
2Br 2F
1Ca 1Ca
2F 2Br

This is balanced.

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3 years ago

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Large crystals are formed when _____. igneous rocks cool very quickly metamorphic rocks change into igneous rock sedimentary roc

vivado [14]

igneous rocks cool very slowly

Explanation:

Large crystals are formed when rocks cool very slowly. This gives time for crystallization nuclei to form and other crystals aggregates round it.

Large crystals in rocks are typical of intrusive igneous rocks.
These rocks are formed beneath the earth surface and they usually have big crystals.
This because they cool slowly and have time for crystal formation.
Rocks that cools rapidly are extrusive igneous rocks.
They are usually fine grained and glassy in nature.

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3 years ago

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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

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
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>

Set up: $\displaystyle 7.8 \ mol \ Li(\frac{6.022 \cdot 10^{23} \ atoms \ Li}{1 \ mol \ Li})$
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

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3 years ago