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sergeinik [125]
3 years ago
15

Javier and Jessica are measuring the water temperature of a stream. Javier records the water temperature at 56°. Jessica tests t

he water at the same location but finds the water temperature is 13°. The students discuss how different and their readings are on discover the problem what is most likely the cause of the different results?
Chemistry
1 answer:
Dominik [7]3 years ago
7 0

Answer I'm not quite sure if this is right, but maybe it's because Jessica put her thermometer deeper in the stream, and Javier put his more up.

Explanation:

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2.91 moles of aluminum are how many grams(with work)
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2.91 mol Al * ( 26.982 g Al / 1 mol Al) = 78.518 grams
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What mass of NaCl would you have dilute to 1L to make up a 0.25M solution?<br> Asap please
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Answer: 0.25m

Im not sure but i think

Explanation:0.25/0.25

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What is a precipitate?
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Give the formula for an ionic compound formed from each pair of ions
Vera_Pavlovna [14]

Please, find the complete question in the picture attached.

Answer:

1. Na₂O

2. AlF₃

3. MgO

4. Ca₃P₂

Explanation:

1. Na⁺ and O²⁻

An ionic compound will be formed when two ions of opposite charge attract each other.

The positive ion is called cation and the negative ion is called anion.

Thus, every ionic compound has a cation and an anion electrostatically bonded.

The ions must combine in a proportion that genders a neutral compound: so you must have as many cations as negative charge has one anion and as many anions as positive charge has one cation.

This is, if the cation has charge +x, there will be x anions, and if the anion has charge -y, there will be y cations.

Simbolically:

Cation:A^{+x}\\ \\ Anion:B^{-y}\\ \\ Compound:A_yB_x

As you see, the subscripts for each element in the chemical formula are obtained by the exchage of the charges of the ions.

Then, for Na⁺ and O²⁻, the subscript for Na will be 2 and the subscript for O will be 1; and the formula of the ionic compound formed by this pair ot ions is:

  • Na₂O

2. Al³⁺ and F⁻

  • The subscript of Al will be 1 (because the F ion has charge 1-, and the subscript of F will be 3 (because the Al ion has charge +3).

Thus the ionic compound formed by this pair of ions is:

  • AlF₃

3. Mg²⁺ and S²⁻

  • The charge 2+ from Mg atom wil become the subscript 2 of S atom, and the charge 2- will become the subscript 2 of Mg atom:

That results in the formula: Mg₂S₂

Except for some special compounds, the chemical formula is simplified, dividing by the least common denominator. In this case, that means that the two 2 subscripts are simplified to 1, and the final chemical formula for the ionic compound formed by this pair of ions is:

  • MgO

4. Ca²⁺ and P³⁻

  • The charge 2+ from Ca will become subscript 2 for P and the charge 3- whill become subscript 3 for Ca.

Hence, the ionic compound formed by these two ions is:

  • Ca₃P₂

7 0
2 years ago
Is water a mixture or compound explain 4 points​
elena-s [515]

Answer:

In my opinion, water is a compound.

Explanation:

Water is mixed from Oxygen(O) and Hydrogen(H) and they cannot be splitted.

Sorry if there any mistakes

6 0
3 years ago
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