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Gemiola [76]
3 years ago
11

Middle school science help please

Chemistry
2 answers:
ElenaW [278]3 years ago
5 0

Answer:

Hydrogen ions <em><u>are represented by H+</u></em>.

Explanation:

  • Hydrogen ions usually <em><u>decreases the pH value</u></em> when added to a solution.
  • Hydrogen ions are contributed to a solution by a <em><u>acid.</u></em>
zavuch27 [327]3 years ago
3 0

Answer:

The answer is 'All of the above'

Explanation:

because the hydrogen ions are represented by the symbol H+, they increase the PH value of a solution if less amount is added but they decrease the PH value of a solution if a larger amount of hydrogen ions are added but still they increase the PH value, and of course, they contribute to a solution by a base.

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Question 11 (5 points)
LenKa [72]

Answer:

False

Explanation:

On the left side of the equation (Li + O2), there is 1 Li atom and 2 O atoms.

but on thw right side of the equation (Li2O,) there is 2 Li atoms and 1 O atom

8 0
3 years ago
What’s the difference between a physical and chemical property
irga5000 [103]

Answer:

One is hands on and one is watching

Explanation:

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3 0
3 years ago
What is chlorine's atomic number and mass
makkiz [27]

\red{⭐hello my \: friend!}

chlorine's atomic number and mass :

35,453 u

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8 0
3 years ago
Hi everyone can anyone help with this, the question and diagram is in the pic thx!
seraphim [82]

Answer:

QP

Explanation:

P has 9 electrons.

Electronic Configuration : 2, 7

Valence electrons : 7

P needs 1 electron to get stable electronic configuration.

Q has 3 electrons.

Electronic Configuration : 2, 1

Valence electrons : 1

P needs to loose 1 electron to get stable electronic configuration.

Q donates 1 electron,

Q -----> Q+ + 1 e-

P gains 1 electron,

P + 1 e- -----> P-

Q+ + P- -----> QP

This is an ionic compound.

8 0
3 years ago
The following reaction shows sodium carbonate reacting with calcium hydroxide.
velikii [3]

Ans: 15.1 grams

Given reaction:

Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3

Mass of Na2CO3 = 20.0 g

Molar mass of Na2CO3 = 105.985 g/mol

# moles of Na2CO3 = 20/105.985 = 0.1887 moles

Based on the reaction stoichiometry: 1 mole of Na2CO3 produces 2 moles of NaOH

# moles of NaOH produced = 0.1887*2 = 0.3774 moles

Molar mass of NaOH = 22.989 + 15.999 + 1.008 = 39.996 g/mol

Mass of NaOH produced = 0.3774*39.996 = 15.09 grams


5 0
3 years ago
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