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Citrus2011 [14]
2 years ago
7

What is the last element in period 4?

Chemistry
1 answer:
Ne4ueva [31]2 years ago
6 0
Scandium<span> (Sc).......hope this helps</span>
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If the mass is 6.5g, and the volume is 25mL.. what is the density? PLEASE ANSWER ASAP
julia-pushkina [17]

Answer:

p = 260 kilogram/cubic meter

Explanation:

ρ =  \frac{m}{V} \\

  = \frac{6.5 g}{25mL}

=  0.26 gram/milliliter

=  260 kilogram/cubic meter

7 0
3 years ago
Consider the reaction 2 al + Fe2O3 to 2Fe + Al2O3. If 60.0g of Al is reacted with excess Fe2O3, determine the amount (in moles)
olganol [36]

 The  amount  of  Al2O3  in moles=  1.11 moles    while in  grams   = 113.22 grams


    <em><u>calculation</u></em>

     2 Al  + Fe2O3 → 2Fe  + Al2O3

    step  1: find the moles of Al  by  use of <u><em>moles= mass/molar  mass  </em></u>formula

    =  60.0/27= 2.22  moles


    Step 2: use the mole ratio to determine the  moles of Al2O3.

 The  mole ratio  of Al : Al2O3 is  2: 1 therefore the moles of Al2O3= 2.22/2=1.11  moles


Step 3:    finds the mass  of  Al2O3  by us of  <u><em>mass= moles x molar mass</em></u><em> </em>formula.

The molar  mass of Al2O3  =  (2x27)  +( 16 x3) = 102  g/mol

mass is therefore=  102  g/mol  x 1.11= 113.22 grams


             

7 0
2 years ago
Calculate the mass of magnesium oxide formed when 3.0 grams of magnesium reacts with excess oxygen.
BlackZzzverrR [31]
Mg+O2=MgO
24 g. = 40 g
3 g. = x
x =  \frac{3 \times 40}{24}  \\ x = 5 \: g
3 0
2 years ago
jenny dissolves as much salt as she can in 100mL of room temperature water. she learned in class that less salt will dissolve in
Slav-nsk [51]

Answer:

if ice is added more salt can be dissolved ...........

5 0
2 years ago
Read 2 more answers
HELP PLEASE !!!!
love history [14]
<span>Answers are:
-4 for C in CH4, because carbon has greater electronegativity than hydrogen and he attracts shared electrons.
</span><span>+4 for C in CO2, because carbon has smaller electronegativity than oxygen.
</span><span>+1 for H in both CH4 and H2O, because hydrogen has amaller electronegativity than both carbon and oxygen. 
</span>
7 0
3 years ago
Read 2 more answers
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