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Degger [83]
4 years ago
15

Label the following changes as CHEMICAL or PHYSICAL change

Chemistry
1 answer:
skelet666 [1.2K]4 years ago
8 0
1. Chemical
2. Physical

1. Exothermic
2. Endothermic

1. Chemical
2. Physical
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PLEASE HURRY THIS IS TIMED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
AURORKA [14]

Answer:

if i remember correctly i beleive its A  1.8 x 10^24

but im not for sure  also i think you forgot the 24

Explanation:

5 0
3 years ago
How many liters of hydrogen gas is produced from 3.712 g of magnesium with 104.2ml of 1.385 mol/L HCL (aq) at SATP? Please show
Licemer1 [7]

Answer:

V=1.61L

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

Mg+2HCl\rightarrow MgCl_2+H_2

Next, we compute the reacting moles of each reactants:

n_{Mg}=3.712gMg*\frac{1molMg}{24.305 gMg}=0.153molMg

n_{HCl}=1.385\frac{molHCl}{L}*0.1042L=0.144molHCl

Then, as magnesium and hydrohloric acid are in a 1:2 molar ratio 0.153 moles of magnesium will completely react with 0.306 moles of hydrochloric acid yet we only have 0.144 moles, therefore, limiting reactant is hydrochloric acid. Thus, we compute the produced moles of hydrogen:

n_{H_2}=0.144molHCl*\frac{1molH_2}{2molHCl} =0.072molH_2

Finally, we use the ideal gas equation with T=298K and 1atm (STP conditions) to compute the liters of hydrogen gas:

PV=nRT\\\\V=\frac{nRT}{P}=\frac{0.072mol*0.082\frac{atm*L}{mol*K}*273K}{1atm}\\  \\V=1.61L

Best regards.

3 0
3 years ago
Use this paragraph Carlon is using two wooden blocks to model the movement of Earth's plates He pushes one block forward and the
tensa zangetsu [6.8K]

Answer:

a

Explanation:

6 0
3 years ago
How many single covalent bonds could an element with the electron
Tcecarenko [31]

Answer:

1

Explanation:

I would say 1 because that configuration has 7 valence electrons.  The goal of the atom is to gain a full octet so it just needs to gain 1 more electron to get the full octet.  To get the one electron to fill the valence shell it would only need to have 1 covalent bond.

I hope this helps.  Let me know if anything is unclear.

5 0
3 years ago
Is 2Na+Cl2=2NaCl a balanced chemical equation
lilavasa [31]

Hey there!

2Na + Cl₂ → 2NaCl

This is a balanced chemical equation.

There are 2 atoms of sodium (Na) on the left, and 2 atoms of sodium (Na) on the right.

There are 2 atoms of chlorine (Cl) on the left, and 2 atoms of chlorine (Cl) on the right.

This means the equation is balanced since there are the same amount of each element on both sides.

Hope this helps!

3 0
3 years ago
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