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3 years ago

Which is an example of a heterogeneous mixture? A coffeeB soilC gelatinD air

1 answer:

6 0

Heterogeneous mixtures are made of different substances that remain physically seperate. An example would be mixing sand and sugar together.
the answer would be soil
The answer is B soil

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The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 Ã 109 yr. A sample of moon rock wa

Aloiza [94]

Answer:

4.66 x 10^8 yr

Explanation:

The age of the rock can be calculated using the equation:

ln (N/N₀) = - kt where N is the quantiy of radioisotope decayed and N₀ is the initially quantity present of the radioisotope; k is the decay constant, and t is the time.

Now from the data , we have 78 argon-40 atoms for every 22 potassium-40 atoms, we can deduce that originally we had 22 + 78 = 100 atoms of potassium-40 so this is our N₀.

When we look at the equation, we see that k is unknown, but we can calculate it from the half-life which is given by the equation:

k = 0.693/ t half-life = 0.693/ 1.3 x 10⁹ yr = 5.33 x 10⁻¹⁰ yr⁻¹

Now we are in position to answer the question.

ln ( 78/100 ) = - (5.33 x 10⁻¹⁰ yr⁻¹ ) t

- 0.249 = - 5.33 x 10⁻¹⁰ yr⁻¹ t

0.249/ 5.33 x 10⁻¹⁰ yr⁻¹ = t

4.66 x 10^8 yr

8 0

3 years ago

What problem would a person have if the nucleic acid in one of his or her

Dmitry_Shevchenko [17]

The answer is B i think

7 0

2 years ago

Which part of Earth most likely has the highest albedo value?

photoshop1234 [79]

Answer:

Sea ice

Explanation:

Sea ice has a much higher albedo compared to other Earth surfaces

7 0

3 years ago

The reactivity of an alkali metal depends on the metals ability to

Klio2033 [76]

<h3>Answer:</h3>

The reactivity of an alkali metal depends on the metals ability to <u>loose an electron</u>.

<h3>Explanation:</h3>

Alkali metals are elements present in first group of the periodic table. Following are the metals from top to bottom;

Lithium

Sodium

Potassium

Rubidium

Cesium

Francium

These s-block elements are considered the most reactive metals in the periodic table because they have only one electron in their valence shell and readily loose that electron to form an ionic bond with non metal. The general electronic configuration of these metals is as follow,

nS¹

Also, the reactivity of these metals increases from top to bottom in the group as the ionization energy decreases due to increase in shielding effect respectively.

4 0

3 years ago

Methane and oxygen react to form carbon dioxide and water. what mass of water is formed if 0.80 g of methane reacts with 3.2 g o

Charra [1.4K]

1.8 g

<h3>Further explanation</h3>

<u>Given:</u>

0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide.

<u>Question:</u>

What mass of water is formed?

<u>The Process:</u>

Methane and oxygen react to form carbon dioxide and water. Remember this, the chemical activity that uses oxygen to produce light and heat is also called the combustion process.

In any chemical reaction, the sum of the masses of the reactants is equal to the sum of the masses of the products. That's right, this is called conservation of the masses.

Let us write the word equation of the chemical reaction and then solve the problem following the law of the conservation of mass.

$\boxed{ \ Methane + Oxygen \rightarrow Carbon \ dioxide + Water\ }$

$\boxed{ \ 0.80 \ g \ + \ 3.2 \ g \rightarrow 2.2 \ g \ + \ m_{Water}? \ }$

$\boxed{ \ m_{reactants} = m_{products} \ }$

$\boxed{ \ 0.80 \ g \ + \ 3.2 \ g = 2.2 \ g \ + \ m_{Water} \ }$

Rewrite by rearranging as follows:

$\boxed{ \ 2.2 \ g \ + \ m_{Water} = 0.80 \ g \ + \ 3.2 \ g \ }$

$\boxed{ \ 2.2 \ g \ + \ m_{Water} = 4.0 \ g \ }$

$\boxed{ \ m_{Water} = 4.0 \ g - 2.2 \ g \ }$

Thus the mass of water formed is 1.8 g.

The balanced equation with state symbols is:

$\boxed{ \ CH_4_{(g)} + 2O_2_{(g)} \rightarrow CO_2_{(g)} + 2H_2O_{(l)} \ }$

<u>Notes:</u>

The French scientist Antoine Laurent Lavoisier represented his essential contribution by declaring the law of conservation of mass as one of the fundamental laws in chemistry.
The law of the conservation of the mass states that in a chemical reaction the sum of the masses of the reactants is equal to the sum of the masses of the products. $\boxed{\boxed{ \ m_{reactants} = m_{products} \ }}$

<h3>Learn more</h3>

Flammability as one of the chemical properties brainly.com/question/1767022
Carbon atoms can form four covalent bonds brainly.com/question/3064597
About the solution as a homogeneous mixture brainly.com/question/637791

Keywords: methane and oxygen, react to form carbon dioxide and water, combustion, to produce, the conservation of mass, the word equation, the balanced equation, Lavoisier

3 0

3 years ago

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