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ycow [4]
4 years ago
7

A student wrote a chemical equation as shown.

Chemistry
2 answers:
Pavel [41]4 years ago
6 0

Answer:

A. Add a coefficient 4 before h2o and add a 2 before so2

Explanation:

svp [43]4 years ago
3 0

Answer : The correct option is, Add a coefficient 2 before H_2O and a 2 before SO_2.

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

The coefficient tell us about that how many molecules or atoms present in the chemical equation.

The given chemical reaction is,

2H_2S+3O_2\rightarrow H_2O+SO_2

This reaction is an unbalanced chemical reaction because in this reaction number of hydrogen, sulfur and oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' is put before the H_2O and SO_2 and we get the balanced chemical equation.

The balanced chemical reaction will be,

2H_2S+3O_2\rightarrow 2H_2O+2SO_2

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yuradex [85]

When the enthalpy of products is higher than that of reactants, such a reaction is said to be endothermic.

<h3>Enthalpy</h3>

The enthalpy of a system refers to the heat content of the system.

When the enthalpy of reactants is higher than that of products in a reaction, such a reaction is said to be exothermic. On the other hand, if the enthalpy of products is higher than that of the reactants, it is endothermic.

More on the enthalpy of systems can be found here: brainly.com/question/13996238

#SPJ1

8 0
2 years ago
A thermos contains 150 cm3 of coffee at 85 ????C. To cool the coffee, you drop two 11-g ice cubes into the thermos. The ice cube
NNADVOKAT [17]

Answer:

73.73°C is the final temperature of the coffee.

Explanation:

Heat lost by the coffee = Q

Mass of the coffee = m

Volume of coffee = V = 150 cm^3=150 mL (1cm^3=1 mL)

Density of water = Density of coffee solution = d = 1 g/mL (given)

Mass =density\times volume

m=1 g/mL\times 150 mL=150 g

Heat capacity of the coffee is equal to that of water= c = 4.18 J/g°C

Initial temperature of the coffee = T_1=85^oC

Final temperature of the coffee = T

Q=mc\times (T-T_1)

Heat required to melt 11 grams of melt ice = Q'

Latent heat of ice = \Delta H_{lat}=334 J/g

Q'=334J/g\times 11g=3674 J

Heat absorbed by the ice after melting = q

Mass of ice melted into water = m' = 11 g

Heat capacity of water = c = 4.18 J/g°C

Initial temperature of water =T_2 = 0°C

Final temperature of water = T

q=m'\times c\times (T_2-T)

According law of conservation of energy , energy lost by coffee will equal to heat required to melt ice and further to raise the temperature of water.

-Q=Q'+q

-(mc\times (T-T_1))=m'\times c\times (T-T_2)+3674 J

150 g\times 4.18 J/g^oC\times (85^oC-T)=11 g\times 4.18 J/g^oC\times (T-0^oC)+3674 J

On solving we get:

T = 73.73°C

73.73°C is the final temperature of the coffee.

3 0
3 years ago
For the reaction below, complete the rate expression that relates the change in concentration with respect to time to the rate o
Ann [662]

Answer: Rate in terms of disappearance of NO = -\frac{1d[NO]}{2dt}

Rate in terms of disappearance of Cl_2= -\frac{1d[Cl_2]}{1dt}

Rate in terms of appearance of NOCl = \frac{1d[NOCl]}{2dt}

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

2NO+Cl_2\rightarrow 2NOCl

The rate in terms of reactants is given as negative as the concentration of reactants is decreasing with time whereas the rate in terms of products is given as positive as the concentration of products is increasing with time.

Rate in terms of disappearance of  = -\frac{1d[NO]}{2dt}

Rate in terms of disappearance of = -\frac{1d[Cl_2]}{1dt}

Rate in terms of appearance of NOCl = +\frac{1d[NOCl]}{2dt}

5 0
3 years ago
SOMEONE PLEASE HELP, I REALLY NEED THIS
kompoz [17]

Answer: TWO WITH LIGHT PINK PRECIPITATE IS  

BaCI2 and AI2(SO4)3 AND BaCI2 and NaOH

Ferric hydroxide and aluminium hydroxide are the precipitate u can form by any major reaction.

Explanation:  Chemical Reaction: BaCl2 and AgNO3

                             Ba+2= Barium= Metal

                             Cl-1= Chlorine = Non-metal

Ag+1 = Silver= Transition Metal

                              NO3 - = Nitrate= Polyatomic Ion

                             BaCl2 = Barium chloride  

Ag(NO3) = Silver (I) Nitrate

5 0
4 years ago
PLEASE HELP!!! HOW DO I DO THIS??
Effectus [21]
4.7 is the answer!

Mark me brainiest
7 0
2 years ago
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