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3 years ago

Which table best summarizes the subatomic particles and their electrical charge?

Chemistry

1 answer:

Tanzania [10]3 years ago

4 0

Answer:

Proton - Positive charge

Neutron - No charge

Electron - negative charge

Explanation:

An atom is the smallest particle of matter that takes part in a chemical reaction.

It is made up of three fundamental subatomic particles.

Protons are the positively charged particles in an atom.
Neutrons do not carry any charges and are neutral
Electrons are negatively charged

Both the protons and neutrons occupy a tiny center where the mass of the atom is concentrated. The region is called the nucleus.

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What is the volume of 90.0 grams of ether if the density of ether is 0.70 g/mL?

Mekhanik [1.2K]

Answer:

b) 1.3 E2 mL

Explanation:

density = mass / volume

∴ m = 90.0 g

∴ density = 0.70 g/mL

⇒ V = m / d

⇒ V = 90.0g / 0.70 g/mL

⇒ V = 128.571 mL

⇒ V = 1.285 E2 mL ≅ 1,3 E2 mL

3 0

3 years ago

if 26.8g of copper (ll) chloride are dissolved in sufficient water to make 4.00 L of solution, what is the molarity of the solut

artcher [175]

Answer: Molarity of the solution is $4.97 \times 10^{-2} M$ and water is the solvent.

Explanation:

Given: Mass of solute = 26.8 g

Volume = 4.00 L

Now, moles of copper (II) chloride (molar mass = 134.45 g/mol) are calculated as follows.

$No. of moles = \frac{mass}{molar mass}\\= \frac{26.8 g}{134.45 g/mol}\\= 0.199 mol$

Molarity is the number of moles of a substance divided by volume of solution in liter.

Therefore, molarity of given solution is calculated as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.199 mol}{4.00 L}\\= 0.04975 M\\= 4.97 \times 10^{-2} M$

Solvent is defined as a component which is present in higher amount in a solution. Generally, a solvent is present in liquid state but it can also be a solid or gas.

In the given solution, copper (II) chloride is dissolved in water so copper (II) chloride is the solute and water is the solvent.

Thus, we can conclude that molarity of the solution is $4.97 \times 10^{-2} M$ and water is the solvent.

4 0

3 years ago

Can someone please help me

Alona [7]

Answer:

Potassium iodide increases the decomposition rate of hydrogen peroxide.

Explanation:

Potassium iodide increases the decomposition rate of hydrogen peroxide because potassium iodide act as a catalyst. A catalyst speed up the process of chemical reaction without reacting with the molecules present in reaction. If the potassium iodide is not present as a catalyst for the decomposition of hydrogen peroxide then the decomposition of hydrogen peroxide takes too much time because the catalyst is absent that speed up the reaction.

5 0

3 years ago

7. A. How many moles of Calcium hydroxide (CaOH2) are needed to completely react with 14.5 mol of Phosphoric acid (H3PO4)?

Artyom0805 [142]

Answer:

moles of calcium hydroxide= 21.75 mol

a) 43.5 mol

b) 7.25 mol

Explanation:

Please see the attached picture for the full solution.

6 0

3 years ago

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Ksju [112]

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3 years ago