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3 years ago

Complete the following blanks on the basis of law of conservation of mass.

Chemistry

2 answers:

charle [14.2K]3 years ago

5 0

8g + 65g = 73g

24g + 38g = 62g

svlad2 [7]3 years ago

4 0

Answer:

1)Na + O2 = > 2NaO

8 g + 65 g = > 73g

2) 2H2 + O2 → 2H2O

24 g + 38g→ 62 g

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How do you think our understanding of genes might affect doctors ability to treat or prevent disease in the future?

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Answer:

dentifying genetic variants Genome sequencing has the potential to improve the diagnosis of conditions caused by changes in the DNA and indicate what treatments may be most effective. Importantly, it may also red-flag treatments likely to cause adverse reactions.

Explanation:

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3 years ago

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Data for the decomposition of hydrogen peroxide at some set temperature T is provided below. The rate law depends only on the co

Viktor [21]

Answer:

$0.00442 s^{-1}$ is the value of the rate constant.

Explanation:

$2 H_2O_2\rightarrow 2 H_2O + O_2$

Let the order of the reaction be x.

The rate law of the reaction can be written as:

$R=k[H_2O_2]^x$

1. Rate of the reaction when concentration changes from 0.882 M to 0.697 M in 0 seconds to 60 seconds.

$R=-\frac{0.697 M-0.882 M}{60 s-0 s}=0.00308 M/s$

$0.00308 M/s=k[0.697 M]^x$ ..[1]

2. Rate of the reaction when concentration changes from 0.697 M to 0.566 M in 240 seconds to 360 seconds.

$R=-\frac{0.236M-0.372M}{120s-60 s}=0.00227 M/s$

$0.00218 M/s=k[0.236 M]^x$ ..[2]

[1] ÷ [2]

$\frac{0.00308 M/s}{0.00227 M/s}=\frac{k[0.697 M]^x}{k[0.236M]^x}$

Solving fro x:

x = 0.92 ≈ 1

$R=k[H_2O_2]^1$

$0.00308 M/s=k[0.697 M]^1$

$k=\frac{0.00308 M/s}{[0.697 M]^1}=0.00442 s^{-1}$

$0.00442 s^{-1}$ is the value of the rate constant.

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4 years ago

Determine the energy of the electron in the 1s orbital of a helium ion (He+ )

Luda [366]

He Rydberg formula can be extended for use with any hydrogen-like chemical elements.
1/ λ = R*Z^2 [ 1/n1^2 - 1/n2^2] 
where 
λ is the wavelength of the light emitted in vacuum; 
R is the Rydberg constant for this element; R 1.09737x 10^7 m-1 
Z is the atomic number, for He, Z =2; 
n1 and n2 are integers such that n1 < n2 
The energy of a He+ 1s orbital is the opposite to the energy needed to ionize the electron that is 
taking it from n = 1 (1/n1^2 =1) to n2 = ∞ (1/n2^2 = 0) 
.: 1/ λ = R*Z^2 = 1.09737x 10^7*(2)^2 
λ = 2.278*10^-8 m 
E = h*c/λ 
Planck constant h = 6.626x10^-34 J s 
c = speed of light = 2.998 x 10^8 m s-1 
E = (6.626x10^-34*2.998 x 10^8)/(2.278*10^-8) = 8.72*10^-18 J ion-1 
Can convert this value to kJ mol-1: 
(8.72*10^-18*6.022 x 10^23)/1*10^3 = 5251 kJ mol-1 
Lit value: RP’s secret book: 5240.4 kJ mol-1 (difference is due to a small change in R going from H to He+) 
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3 years ago

Formal charge of Cl in CHCl3

Vsevolod [243]

FC(C) = 4 - 0.5*8 - 0 = 0) FC(Cl) = 7 - 0.5*2 - 6 = 0

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3 years ago

Please help me i will mark brainliest

gulaghasi [49]

Answer:

7) Example: Gravitational force

Gravitational force, also known as gravity, is a type of non- contact force.

10) Unbalanced forces can cause an object to accelerate, make a stationary object move, or cause a moving object to stop.

12) Gravitational force, Frictional force, Magnetic force

13) Friction is beneficial when we are walking as it prevents us from slipping.

For the table, find the net force first and that would help us to find the direction and the type of force (balanced/ unbalanced).

As written in Q11, add all the forces together to determine the net force acting on an object. More specifically, add the forces that act in one direction together. Then subtract the forces acting in the other direction.

Let's look at the teddy bear (Q14 -16):

Take note that we have to look at the direction of the arrow not which side the arrow is on (left/ right of the bear).

Total force acting towards the left

= 16 +7

= 23N

Total force acting on the right= 22N

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= 23 -22

= 1N towards the left

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15) 1N

15) 1N16) left

Vase question:

Total downward force

= 11 +33

= 44N

Total upward force

= 25 +19

= 44N

Net force= 0N

17) Balanced

17) Balanced18) 0N

17) Balanced18) 0N19) No direction

Bicycle question:

Total force acting towards the right

= 65 +115

= 180N

Total force to the left= 170N

Net force

= 180 -170

= 10N to the right

20) Unbalanced

20) Unbalanced21) 10N

20) Unbalanced21) 10N22) To the right

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3 years ago