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balu736 [363]
3 years ago
11

Classify the type of force, attractive or repulsive, between the following pairs of particles: Electron-electron: Electron-proto

n: Proton-proton: Chloride ion (Cl-)-sodium ion (Na+):
Chemistry
2 answers:
givi [52]3 years ago
8 0

Answer:

Repulsive

Attractive

Repulsive

Attractive

Explanation:

just took it on edge :)

Valentin [98]3 years ago
3 0

Answer: 1.) repulsive

              2.) attractive

              3.) repulsive

              4.) attractive  

Explanation:

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Group 2A metal oxides react with water to produce hydroxides. When 35.55 g of CaO are placed into 125 mL of water (d= 1.000 g/mL
Vika [28.1K]
Answer is: mass of calcium hydroxide is 46.98 grams.
Balanced chemical reaction: CaO + H₂O → Ca(OH)₂.
m(CaO) = 35.55 g.
n(CaO) = m(CaO) ÷ M(CaO).
n(CaO) = 35.55 g ÷ 56 g/mol.
n(CaO) = 0.634 mol; limiting reactant.
m(H₂O) = 125 mL · 1.000 g/mL.
m(H₂O) = 125 g.
n(H₂O) = 125 g ÷ 18 g/mol.
n(H₂O) = 6.94 mol.
From chemical reaction: n(CaO) : n(Ca(OH)₂) = 1 : 1.
n(Ca(OH)₂) = 0.634 mol.
m(Ca(OH)₂) = 0.634 mol · 74.1 g/mol = 46.98 g.
5 0
3 years ago
Find the density of a substance that has a mass of 75 g and a volume of 35 mL. Don't forget your units!
Andrew [12]

Answer:

The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 \frac{g}{mL}

Explanation:

Density is a characteristic property of a substance that relates to the amount of mass it has per unit volume. In other words, density is the property that matter, whether solid, liquid or gas, has to compress into a given space (it measures the amount of mass in a given volume of a substance). It is calculated as the quotient between the mass of a body and the volume it occupies:

density=\frac{mass}{volume}

In this case, you know:

  • mass= 75 g
  • volume= 35 mL

Replacing:

density=\frac{75 g}{35 mL}

Solving:

density=2.14\frac{g}{mL}

<u><em>The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 </em></u>\frac{g}{mL}<u><em></em></u>

5 0
3 years ago
a student lists three temperature measurements 100 f , 100 c, and 100 k of the highest temps 100 k is the highest true or false
Archy [21]

Answer:

False, it is actually 100 kelvins

Explanation:

7 0
3 years ago
Read 2 more answers
How many moles are in 85.0 grams of water
alexgriva [62]
To convert from grams to moles, you must divide the given mass by the molecular weight. If this is so, then:

Water ≈ 18.02 grams/mol.

85.0 g/ 18.02 g/mol ≈ 4.72 moles
3 0
4 years ago
How many protons, neutrons, and electrons are in an atom of beryllium with a mass number of 9?
ki77a [65]

Answer:

c / a

correct me if im wrong

7 0
3 years ago
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