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sveta [45]
2 years ago
7

What’s the difference between internal stimuli and external stimuli

Chemistry
1 answer:
oee [108]2 years ago
3 0

Answer:

An external stimuli is a stimulus that comes from outside an organism and causes a reaction.An internal stimuli is a stimulus that comes from inside an organism.

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Fulgurites are the products of the melting that occurs when lightning strikes the earth. Microscopic examination of a sand fulgu
BlackZzzverrR [31]

Answer:

Fe₃Si₇

Explanation:

In order to determine the empirical formula, we have to follow a series of steps.

Step 1: Determine the percent composition

Fe: 46.01%

Si: 53.99%

Step 2: Divide each percentage by the atomic mass of the element

Fe: 46.01/55.85 = 0.8238

Si: 53.99/28.09 = 1.922

Step 3: Divide all the numbers by the smallest one

Fe: 0.8238/0.8238 = 1

Si: 1.922/0.8238 = 2.33

Step 4: Multiply by numbers that make the coefficients whole.

Fe: 1 × 3 = 3

Si: 2.33 × 3 = 7

The empirical formula is Fe₃Si₇.

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3 years ago
In the recrytallization / melting point lab, there are a number of experimental details that need to be followed. Choose whether
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Answer:

I think the answer is A.

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Which is the correct chemical symbol for this atom of helium?
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H........................................
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Who was the first inventor of electric bulb?<br>a) Edison<br>b) Joseph <br>c) Maxim​
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Thomas Edison is the answer...no a

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Read 2 more answers
Write ionic equations for the following:
tatiyna

Answer:

1. H⁺ (aq) + NO₃⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → Na⁺ (aq) + NO₃⁻ (aq) + H₂O (l)

2. H⁺ (aq) + Cl⁻ (aq) + K⁺ (aq) + OH⁻ (aq) → K⁺ (aq) + Cl⁻ (aq) + H₂O (l)

3. 2H⁺ (aq) + SO₄²⁻ (aq) + Mg²⁺ (aq) + 2OH⁻ (aq) → Mg²⁺ (aq) + SO₄²⁻ (aq) + 2H₂O (l)

Explanation:

The ionic equation is an equation illustrating all the ions occurring in a reaction individually;

This is similar but can differ from the normal equation, because, typically, certain compounds consist of ions that dissociate in aqueous phase;

Net ionic equations can be found by eliminating all ions that remain the same, i.e. do not change state, which are known as spectator ions;

1. H⁺ (aq) + NO₃⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → Na⁺ (aq) + NO₃⁻ (aq) + H₂O (l)

Net: H⁺ (aq) + OH⁻ (aq) → H₂O (l)

NO₃⁻ ions are aqueous prior to the reaction and remain aqueous afterwards;

Similarly, the Na⁺ ions also remain aqueous;

The H⁺ and OH⁻, however, are aqueous (free ions in the solution) before the reaction;

After the reaction, these become the compound H₂O, a liquid so they do change state

2. H⁺ (aq) + Cl⁻ (aq) + K⁺ (aq) + OH⁻ (aq) → K⁺ (aq) + Cl⁻ (aq) + H₂O (l)

Net: H⁺ (aq) + OH⁻ (aq) → H₂O (l)

3. 2H⁺ (aq) + SO₄²⁻ (aq) + Mg²⁺ (aq) + 2OH⁻ (aq) → Mg²⁺ (aq) + SO₄²⁻ (aq) + 2H₂O (l)

Net: 2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

7 0
2 years ago
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