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3 years ago

What is one way to tell if a mineral is an element?

Chemistry

1 answer:

erastova [34]3 years ago

8 0

Answer:

if it is pure and its a compound or an element

Explanation:

You might be interested in

In a 3.7- gram sample, there are______ atoms of gold

beks73 [17]

<h3>Answer:</h3>

1.1 × 10²² atoms Au

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

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<h3>Explanation:</h3>

<u>Step 1: Define</u>

3.7 g Au

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

Avogadro's Number

Molar Mass of Au - 196.97 g/mol

<u>Step 3: Convert</u>

<u /> $3.7 \ g \ Au(\frac{1 \ mol \ Au}{196.97 \ g \ Au} )(\frac{6.022 \cdot 10^{23} \ atoms \ Au}{1 \ mol \ Au} )$ = 1.13121 × 10²² atoms Au

<u>Step 4: Check</u>

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

1.13121 × 10²² atoms Au ≈ 1.1 × 10²² atoms Au

7 0

3 years ago

I have a 270 g cup of coffee at 94.1 degrees Celsius. Assume that the specific heat of coffee is the same as pure water, 4.18 J/

natulia [17]

Answer:

90.64 degrees

Explanation:

Lets list out the parameters given in the question.

Mass of Cup = 270g

Temp. of cup = 94.1C

Specific heat capacity of C = 4.18J/gC

Temp. of Silver spoon = 26.8C

heat capacity of the silver spoon = 61.2 J/C

The fact that thermal equilibrium was mentioned simply means that;

Heat Lost by coffee= Heat gained by spoon

The relationship between the parameters mentioned is given as;

Q = m* c * dT

Where;

m is the mass, c is the specific heat capacity and dT is the "change" in temperature.

Assume the final temperature of the whole system is "x". They would both have the same final temperature since they are in thermal equilibrium.

Heat lost by coffee = 270 * 4.18 * (94.1 - x)

(94.1 -x) because coffee will loose heat, hence temperature of coffee will fall.

Heat gained by spoon = c *dT = 61.2 * (x - 26.8).

dT = Final Temp. - Initial Temp.

dT = x - 26.8

Heat lost = Heat gained :

270 * 4.18 * (94.1 - x) = 61.2 * (x - 26.8),

1128.6 (94.1 - x) = 61.2 (x- 26.8)

18.44 ( 94.1 - x) = x - 26.8

1735.2 - 18.44 x = x - 26.8

1735.2 + 26.8 = x + 18.44 x

1762 = 19.44 x

x = 90.64 degrees

8 0

3 years ago

What is the oxidation number for each atom in NH4CI?

Alika [10]

5 0

4 years ago

A 1.56 g sample of copper reacts with a mass of oxygen to form 1.95 g of the metal oxide. In another experiment, the molar mass

vitfil [10]

Answer:

The molecular formula of the metal oxide is CuO

Explanation:

Molar mass 79.545 g/m belongs to CuO

This is the reaction:

2Cu(s) + O₂(g) → 2CuO (s)

2 mol of Cu produce 2 mol of CuO

Molar mass Cu = 63.5 g/m

Mass / Molar mass = 1.56 g / 63.5 g/m →0.0245 m

0.0245 mol of Cu produce 0.0245 mole of CuO

Molar mass CuO = 79.545 g/m

Mol . Molar mass = mass

0.0245 m . 79.545 g/m = 1.95 g

6 0

3 years ago

3. What keeps Earth revolving around the sun?

DENIUS [597]

Answer:

A. The force of gravity.

7 0

3 years ago

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