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3 years ago

Which of the following is a physical change. A piece of magnesium metal formed bubbles when dropped in acid

1 answer:

3 0

H2O became a vapor when heated because thats the only one that can go back to its normal state, which is what a physical change is.

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Which is the correct number of moles of NO that is produced from 13.2 moles of oxygen

Oksanka [162]

<h3>Answer:</h3>

10.6 mol NO

<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>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

[RxN - Balanced] 4NH₃ + 5O₂ → 4NO + 6H₂O

[Given] 13.2 mol O₂

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

[RxN] 5 mol O₂ → 4 mol NO

<u>Step 3: Stoich</u>

[DA] Set up: $\displaystyle 13.2 \ mol \ O_2(\frac{4 \ mol \ NO}{5 \ mol \ O_2})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 10.56 \ mol \ NO$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

10.56 mol NO ≈ 10.6 mol NO

5 0

2 years ago

The amount of water (density 1.00 g mL-1) in grams that must be added to 26.2 g of

Damm [24]

Answer:

1720.8g water are necessaries

Explanation:

Mass percent is defined as the mass of solute (In this case, MgCl2) in 100g of solution (Mass MgCl2 + Mass water). To solve this question we must find the mass of solution that we need to produce th 1.5% by mass solution. Thus, we can find the mass of water that we need as follows:

<em>Mass solution:</em>

26.2g MgCl2 * (100g Solution / 1.5g MgCl2) = 1747g solution

<em>Mass water:</em>

1747g solution - 26.2g MgCl2 = 1720.8g water are necessaries

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2 years ago

Calcium carbonate + hydrochloric acid forms copper ___ + water + carbon dioxide

11Alexandr11 [23.1K]

Answer:

The answer copper carbonate

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2 years ago

What’s the relationship between temperature and motion

kifflom [539]

The relationship between the two is that the higher the molecular motion is, the higher the temperature is.

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3 years ago

A ____ is a large area of thick ice that moves slowly

slega [8]

A Glacier is a large area of thick ice that moves slowly

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3 years ago