All categories

3 years ago

Need help with this please thanks

Chemistry

1 answer:

kolbaska11 [484]3 years ago

5 0

Answer: 1. $2H_2+O_2\rightarrow 2H_2O$

2. $P_4+3O_2\rightarrow 2P_2O_3$

3. $N_2+3H_2\rightarrow 2NH_3$

4. $2K+Cl_2\rightarrow 2KCl$

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The given equations are balanced as:

1. $2H_2+O_2\rightarrow 2H_2O$

2. $P_4+3O_2\rightarrow 2P_2O_3$

3. $N_2+3H_2\rightarrow 2NH_3$

4. $2K+Cl_2\rightarrow 2KCl$

You might be interested in

Which of the following is one way that nuclear reactions differ from chemical reactions?

Juliette [100K]

Answer:

Nuclear reaction takes place at the nucleus whereas chemical reaction involves valence electrons

Explanation:

6 0

3 years ago

Which electrolyte is stronger, NaOH or Ca(OH)2? Why?

nataly862011 [7]

Answer:

NaOH

Explanation:

Look at charge Na has +1 charge and Ca has +2 charge after dissociation . Greater charge Stronger lattice. And as we need weak Lattice, so NaoH is stronger base than Ca(OH)2.

8 0

3 years ago

A 5.5 g sample of a substance contains only carbon and oxygen. Carbon makes up 35% of the mass of the substance. The rest is mad

Umnica [9.8K]

We have been given the condition that carbon makes up 35% of the mass of the substance and the rest is made up of oxygen. With this, it can be concluded that 65% of the substance is made up of oxygen. If we let x be the mass of oxygen in the substance, the operation that would best represent the scenario is,

x = (0.65)(5.5 g)

 x = 3.575 g

8 0

3 years ago

The azide ion, n−3, is a symmetrical ion, all of whose contributing structures have formal charges. draw three important contrib

stich3 [128]

Explanation:

Contributing structures are the resonating structures which are formed due to the delocalization of electrons in a molecule.

The azide ion that is $N^{-}_3$ , is a symmetrical ion, all of whose contributing structures have formal charges.

Lone pair of central nitrogen atom in azide ion is in conjugation with the neighboring nitrogen atoms.

Contributing structures of azide ion are drawn in the image attached.

5 0

3 years ago

Andrej [43]

It provides evidence that each organism is related and similar in each way, leading to the conclusion of a common ancestor.

6 0

3 years ago