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shtirl [24]
3 years ago
13

Which of the following are not correctly balanced reactions?

Physics
1 answer:
expeople1 [14]3 years ago
6 0

Answer:

B. 2K + Br2 + 2KBr

D. C + 02 → CO2

Explanation:

In balancing a chemical reaction, the number of atoms on both sides of the expression must be the same in order to obey the law of conservation of mass.

According to the law of conservation of mass, in a chemical reaction, matter is neither created nor destroyed.

 So, let us investigate:

                                                 Number of atoms

                            Reactants                                        Products

K                                  2                                                      2

Br                                 2                                                      2

C + 0₂ → CO₂

C                                1                                                        1

O₂                              2                                                      2

We see that for both equations, the number of atoms on both sides of the expression is the same.

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6. The temperature of a mass of tin increases from 24.0 degrees C to 34.0 degrees C when 250 J of thermal energy are added. Calc
irina [24]

Answer:

110 g

Explanation:

q = mCΔT

where q is heat, m is mass, C is specific heat capacity, and ΔT is change in temperature.

Given q = 250 J, C = 0.228 J/g/°C, and ΔT = 10.0 °C:

250 J = m (0.228 J/g/°C) (10.0 °C)

m = 110 g

6 0
3 years ago
You stand 17.5 m from a wall holding a softball. You throw the softball at the wall at an angle of 30.5 ∘ from the ground with a
Levart [38]

Answer:

5.39 m

Explanation:

From kinematics

s=u_x t where t is time, s is distance and u_x is initial speed in x direction

u_x= 20.5cos 30.5=17.6634 m/s

u_y= 20.5 sin 30.5=10.40454 m/s

Now 17.5=17.6634 t

t=\frac {17.5}{17.6634} =0.99 s

Using the equation of kinematics

h=u_y t- 0.5gt^{2}

h=10.40454\times 0.99^{2}-0.5\times 9.81\times 0.99^{2}

h=5.39 m

5 0
3 years ago
The new sweet potato plant grew from the root of the original through
noname [10]
The old sweet potatoes rootlings
3 0
4 years ago
A flowerpot falls from a window sill 36.5 m
hram777 [196]

When a flowerpot falls from a window sill 36.5 m

above the sidewalk, then the velocity of the flowerpot is 26.7 m/s.

From Newton's third equation of motion,

v^2 = u^2 + 2gh

where,

h is the height of the object or body from ground

u is the initial velocity of the body or object

v is the final velocity of the body or object

g is the acceleration due to gravity

Now, as we know that

Flowerpot is at rest. So, u = 0

g = 9.81m/s^2

h = 36.5m

By substituting all the values, we get

v^2 = 2 × 9.81 × 36.5

= 716.13

v = 26.7m/s

Thus, we concluded that when a flowerpot falls from a window sill 36.5 m

above the sidewalk, then the velocity of the flowerpot is 26.7 m/s.

learn more about Newton's equation of law of motion:

brainly.com/question/8898885

#SPJ9

7 0
1 year ago
Which of the following is NOT a symptom associated with hypertension?
zepelin [54]
I would say a or d hope this helps haha ( also if you could do brainliest for this that would be AMASINF bc I really want to rank up, u don’t have to tho)
8 0
3 years ago
Read 2 more answers
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