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love history [14]
3 years ago
6

(science)

Chemistry
2 answers:
Simora [160]3 years ago
7 0
The answer is B element symbols
ra1l [238]3 years ago
6 0

Answer:

b. . the element symbol

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How many grams are there in 7.4x10^23 molecules of Na2SO4?
weeeeeb [17]
Molar mass Na2SO4 = <span>142.04 g/mol

142.04 g -------------- 6.02x10</span>²³ atoms
??  g ------------------ 7.4x10²³ atoms

142.04 x ( 7.4x10²³) / 6.02x10²³

=> 174.60 g
8 0
3 years ago
Describe the relationship between predator and prey in a balanced ecosystem.
Annette [7]
<h2><u>Relationship between predator and prey in a balanced ecosystem.</u></h2>

Predators grow along with their victims. Over time, prey animals are now developing and avoiding themselves to get eaten by their predators. Such tactics and modifications can take many forms that make their work easier, including disguise, mimicry, defense mechanisms, flexibility, distance, habits and even tool use.

Though fact an equilibrium appears to occur within an ecosystem between predators and prey, there are several factors which affect it, including the birth and death rates of predators and preys.

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3 years ago
Predict the outcome of this reaction. Balancing doesn't matter. <br><br> Mg + H2O --&gt;
ELEN [110]

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MgO + H₂

Explanation:

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This is a single displacement reaction.

In this reaction, the possibility of the reaction is determined by position of the atoms on the activity series.

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            Mg + H₂O → MgO + H₂

7 0
3 years ago
NiSe2 + Ca3(PO4)2 = Ni3(PO4)2 + CaSe<br><br> balance please
Aliun [14]
3Ni + Sn3(PO4)2 → Ni3(PO4)2 + 3Sn I think. Not for sure though
8 0
2 years ago
A student Increases the temperature of a 417 cubic centimeter balloon from 278 K to 231 K. Assuming constant pressure what shoul
WITCHER [35]
Initial Conditions:
Volume= v1= 417 cm³
Temperature= T1 = 278 K
 
Final Conditions:
Temperature= T2 = 231K
Volume = v2 =?

Use the general gas equation;

                                        P1*v1/T1 =  P2*v2/T2
As, the temperature is constant;
 So,
                                               v1/T1 = v2/T2
                                              417/278 = v2/231
                                                  v2= 346.5 cm³                                           
5 0
3 years ago
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