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3 years ago

For questions 18-21, . In each space, classify the reaction type.

Physics

2 answers:

Sergeu [11.5K]3 years ago

4 0

Answer:

$2LiBr+Pb(NO_3) = PbBr_2+ 2LiNO_3$ is a double displacement reaction

$Fe+2HCl = FeCl_2+2H_2$ is a redox reaction

$CaO+H_2 O = Ca(OH)_ 2$ is a combination reaction

$NiCl_2 = Ni+Cl_2$ is a decomposition reaction

Explanation:

$2LiBr+PbNO_3 = PbBr_2+2LiNO_3$

It is of the form $AX+BY = AY+BX$

$Fe+2HCl = FeCl_2+H_2$

Both oxidation and reduction occur in this reaction. Fe gets oxidized and H gets reduced.

$Fe = Fe^(2+)+2e^-$

$2H^++2e^- = H_2$

$CaO+H_2 O = Ca(OH)_2$

It is an exothermic combination reaction. Calcium reacts with water to produce calcium hydroxide and heat is released in this process.

$NiCl_2 = Ni+Cl_2$

It is a decomposition reaction where nickel chloride decomposes to nickel and chlorine.

igomit [66]3 years ago

4 0

Answer:

18. Double Displacement Reaction

19. Single Displacement Reaction

20. Synthesis Reaction

21. Decomposition Reaction

Explanation:

Double Displacement formula:

AB + CD --> AD + CB

Single Displacement formula:

A + BC --> AC + B

Synthesis formula:

A + B --> AB

Decomposition formula:

AB --> A + B

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A capacitor is connected across an AC source. Suppose the frequency of the source is doubled. What happens to the capacitive rea

Slav-nsk [51]

Answer:

the capacitive reactance is reduced by a factor 2

Explanation:

The capacitive reactance is given by:

$X_C = \frac{1}{2\pi f C}$

where

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C is the capacitance

In this case, the frequency of the source is doubled:

f' = 2f

while the capacitance does not change. So the new capacitive reactance will be

$X_C' = \frac{1}{2\pi f' C}=\frac{1}{2\pi (2f)C}=\frac{1}{2}X_C$

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4 years ago

After running, your friend lies down on a tile floor because he says the "coolness" of the tile transfers to his body. Is this s

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Answer:

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Explanation:

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3 years ago

A force of 25.0 N is applied 30° above the horizontal to a 5.0 kg box to move it across a smooth surface having coefficient of k

nordsb [41]

Answer:2.87

Explanation:

Given

mass of force=25 N

mass of box=5 kg

coefficient of kinetic friction $\mu _k=0.2$

Acceleration of box will be provided by its cos component and friction try to oppose it

Normal reaction $=mg-F\sin 30$

$N=5\times 9.8 -25\sin 30 =36.5 N$

friction force $(f_r)=\mu _k N=0.2\times 36.5=7.3 N$

net force in horizontal direction

$F\cos 30 -f_r=ma$

$25\cos 30-7.3=5\times a$

$a=2.87 m/s^2$

8 0

3 years ago

A string with one 10-g washer on the end is attached to the rearview mirror of a car. when the car leaves an intersection, the s

zhenek [66]

Answer:

The acceleration of the car is 1.02 m/s².

Explanation:

Given that,

mass = 10 g

Angle = 6°

Suppose we need to find the acceleration of the car.

We need to calculate the tension

Using balance vertical force

$T\cos\theta= mg$

Put the value into the formula

$T\cos6=0.01\times9.8$

$T=\dfrac{0.01\times9.8}{\cos6}$

$T=0.098\ N$

We need to calculate the acceleration of the car

Using balance equation

$T\sin\theta=ma$

$a=\dfrac{T\sin\theta}{m}$

Put the value into the formula

$a=\dfrac{0.098\times\sin6}{0.01}$

$a=1.02\ m/s^2$

Hence, The acceleration of the car is 1.02 m/s².

7 0

4 years ago