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3 years ago

Help me please someone help me I’ve been here for hours

Chemistry

1 answer:

mash [69]3 years ago

7 0

Answer:

Eukarya- Multicellar and unicellar

Explanation:

Fugi- Multicellar

Protista- unicellar

eubacteria- unicellar and have no nucleus

Eukarya is the only option, and that is because Eukarya is both! It contains a nucleus, and a membrane making it the only one that fits into the incomplete graphic! Hope this helps! (I noticed you were waiting for a while so I came to help! <3)

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Cann someone plss help me with this!!

ira [324]

Atom
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Cathode rays
Neutron
Equal to
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Subtract the atomic number
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6 0

3 years ago

Hoeveel gram opgeloste stof moet je afwegen om 250 ml KMnO4-oplossing te bereiden met een concentratie van 0,500 mol / L

Hatshy [7]

How many grams of solute do you have to weigh to prepare 250 ml KMnO4 solution with a concentration of 0.500 mol / L

Answer:

19.75g

Explanation:

Given parameters:

Volume of KMnO₄ = 250mL or 0.25L

Concentration of solution = 0.5mol/L

Unknown:

Mass of solute or KMnO₄ = ?

Solution:

To solve this problem, we need to find the number of moles first.

Number of moles = Concentration x volume

Number of moles = 0.5mol/L x 0.25L = 0.125mol

So;

Mass in grams = number of moles x molar mass

Molar mass of KMnO₄ = 39 + 55 + 4(16) = 158g/mol

Mass in grams = 0.125 x 158 = 19.75g

7 0

3 years ago

Read 2 more answers

Write the balanced equation. Then calculate the volume of 0.65 M HCl required to completely neutralize 400.0 ml of 0.88 M KOH.

Misha Larkins [42]

Hello!

The balanced equation for the neutralization of KOH is the following:

HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

To calculate the volume of HCl required, we can apply the following equation:

$moles HCl = moles KOH \\ \\ cHCl*vHCl=cKOH*vKOH \\ \\ vHCl= \frac{cKOH*vKOH}{cHCl}= \frac{400 mL*0,88M}{0,65M}= 541,54mL$

So, the required volume of HCl is 541,54 mL

Have a nice day!

8 0

3 years ago

Which of the following equations demonstrates the law of conservation of mass?

VLD [36.1K]

Answer:

Mg + O2 ---> MgO

Explanation: V2O5 + CaS → CaO + V2S5. 5V2O5 + 5CaS → 10CaO + 5V2S5. 3V2O5 + 3CaS → 3CaO + 3V2S5.

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3 years ago

How do protons determine element identity

Butoxors [25]

Answer:

The number of protons also determines the identity of the element. ... Since the atom is electrically neutral, the number of electrons must equal the number of protons.

4 0

3 years ago