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yulyashka [42]
3 years ago
8

Is calcium a metal, nonmetal, or metalloid?

Chemistry
1 answer:
Vilka [71]3 years ago
4 0

Answer:

Calcium is a metal.

Explanation:

It is considered a metal because it is most likely to give away it's two valence electrons to reach Argon. All the elements in gray are metals.

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13.50 grams of Pb(NO3)4 are dissolved in enough water to make 250 mL of solution. What is the molar its of the resulting solutio
likoan [24]
Data:
M (molarity) = ? (M or Mol/L)
m (mass) = 13.50 g
V (volume) = 250 mL → 0.25 L
MM (Molar Mass) of Lead(IV) Nitrate Pb(NO_3)_4
Pb = 1*207 = 207 amu
N = (1*14)*4 = 14*4 = 56 amu
O = (3*16)*4 = 48*4 = 192 amu
------------------------------------
MM of Pb(NO_3)_4 = 207+56+192 = 455 g/mol

Formula:
M =  \frac{m}{MM*V}

Solving:
M = \frac{m}{MM*V}
M =  \frac{13.50}{455*0.25}
M =  \frac{13.50}{113.75}
M = 0.118681318...\:\:\to\:\:\boxed{\boxed{M \approx 0.119\:Mol/L}}\end{array}}\qquad\quad\checkmark

Answer:
<span>B. 0.119 M</span>
5 0
3 years ago
Caffeine is one of many naturally occurring chemicals in tea plants that plays two important roles: protecting the plant from pr
AnnyKZ [126]

Caffeine is more soluble in dichloromethane and the both are separated by evaporating the solvent.

Caffeine is an organic plant material which is more soluble in non-polar solvents than in polar solvents. As such, caffeine is more soluble in dichloromethane than in pure water.

In order to carry out a liquid-liquid exaction of dichloromethane from a commercial teabag, the dichloromethane is mixed with water. The caffeine is found to be more soluble in the organic dichloromethane layer than in water.

The two solvents can now be separated using a separating funnel and the solution is evaporated to obtain the caffeine.

Learn more: brainly.com/question/967776

6 0
2 years ago
What is the mass of 0.572 moles of Al?
kozerog [31]
Answer: 15.433704

Use the periodic table to check the atomic mass, this is the number of grams per mole → 1 mole of Aluminum is 26.982 g
5 0
2 years ago
The map below shows the range of three types of grasslands in the United
Sav [38]
I’m so sorry about the other guy! The answer is A. Infertile soil honey

God Bless!! <3
6 0
2 years ago
Read 2 more answers
g Which of the following is TRUE for a system that is in dynamic equilibrium? Which of the following is TRUE for a system that i
Firdavs [7]

Answer:

none of the above

Explanation:

A system is said to have attained dynamic equilibrium when the forward and reverse reactions proceed at the same rate. That is;

Rate of forward reaction = Rate of reverse reaction

The implication of this is that the concentrations of reactants and products remain constant when dynamic equilibrium is attained in a system. This does not mean that the reactant and product concentrations become equal; it rather means that their concentrations do not significantly change once dynamic equilibrium has been attained.

3 0
3 years ago
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