please I need help its timed-
Students in a science class observed that when a strip of magnesium (Mg) metal was placed in a test tube containing hydrochloric acid (HCl), the magnesium began to bubble as hydrogen gas and magnesium chloride are formed. Which of the following choices show both the correctly balanced equation and identify the type of reaction?


A.

Mg + 2HCl →2H2 + MgCl2 (single replacement)


B.

Mg + 2HCl →H2 + MgCl2 (single replacement)


C.

Mg + 2HCl →H2 + MgCl2 (synthesis)


D.

2Mg + HCl →H2 + 2MgCl2 (synthesis)

Answer:

the answer is c

Explanation:

by transferring heat from the tropics to the colder climates

The statement which best describes how the ocean convection cycle impacts different climates is by transferring heat from the tropics to the colder climates. Thus, the correct option for this question is C.

The ocean convection cycle may be characterized as a type of methodology through which the mesoscale ocean circulation and large, strong winds mix layers of water at different depths.

During this cycle, when one part of a fluid is heated, the temperature difference causes by transferring heat from the tropics to the colder climates fluid to move in a current or defined direction. As the heated fluid rises, it is replaced by a cooler fluid, which is sometimes referred to as a convection cycle.

Therefore, transferring heat from the tropics to the colder climates is the process that best describes how the ocean convection cycle impacts different climates. Thus, the correct option for this question is C.

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Answer:

At B

Explanation:

If it's placed on place B as soon as the cold water arrived it will have time to heat. Hope this helps and best of luck

Answer:

Uranus’ distance from the Sun is 2.88 billion km. The exact number is 2,876,679,082 km. Want that number in miles? Uranus’ distance from the Sun is 1.79 billion miles.

Explanation:

Uranus's average distance from the sun as multiple of earth's average distance from the sun is 19.2 AU.

According to Kepler's third law, the square of the period of revolution of the planets is equal to the cube of their mean distance from the sun in astronomical units.  

Using this law;

T^2 = r^3

T = period of revolution = 84 years

r = distance = ?

r = 3√T^2

r =  3√( 84)^2

r = 19.2 AU

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Answer:

I believe the answer is B.

Answer:

c

Explanation:

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as for the production of biomass energy wood is mostly used source and burning of wood for the production of biomass energy can lead to the risk of deforestation in the future and emissions of carbons, pollute the surrounding. Thus this is the reason biomass energy might not be a good alternative energy source.

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Answer:

The point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed is called focal point

Answer:

Distance travelled is 7 meters and the displacement is 3 meters

Answer:

60m/s

Explanation:

since the object is falling under the influence of gravity, the formula is

v = u +gt

before the fall, the object is at rest then

u = 0m/s

v = 0 + 10×6 because acceleration due to gravity is g which is given as 10m/s2

therefore, v = 60m/s

Answer:

80 joules of work

Explanation:

Use W=F·d

W=10N(8M)= 80 Joules

Answer:

Warm matter

Explanation:

Atoms in warm matter are more easily excitable - they jiggle and move more rapidly than atoms in a cold environment, and since a sound wave is a wave of vibrating matter, these waves will naturally travel quicker when it's warmer.

Answer:

F = 20 N

Explanation:

Given that,

Mass of the football, m = 2 kg

Initial speed, u = 0

Final speed,v = 5 m/s

The time of contact, t = 0.5 s

We need to found the average force applied by the footballer  on the football. We can find it using the formula.

[tex]F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{2\times (5-0)}{0.5}\\\\F=20\ N[/tex]

So, the required force is 20 N.

Answer:

F=20

Explanation:

f=20

Answer:

1450.4 KN[tex]m^{2}[/tex]

Explanation:

Pressure = ρhg

where: ρ is the density of the liquid, h is the height and g the force of gravity.

Total pressure exerted by the liquids at the base = Pressure of oil + Pressure of water + Pressure of mercury

So that,

i. Pressure of oil = ρhg

(ρ = 0.8 g/cm³ = 800 kg/m³)

                        = 800 x 5 x 9.8

                        = 39200

Pressure of oil = 39200 N[tex]m^{2}[/tex]

ii. Pressure of water = ρhg

(ρ = 1 g/cm³ = 1000 kg/m³)

                                      = 1000 x 8 x 9.8

                                     = 78400

Pressure of water = 78400 N[tex]m^{2}[/tex]

ii. Pressure of mercury = ρhg

(ρ = 13.6 g/cm³ = 13600 kg/m³)

                      = 13600 x 10 x 9.8

                      = 1332800

Pressure of mercury = 1332800 N[tex]m^{2}[/tex]

So that,

Total pressure exerted by the liquids at the base = 39200 + 78400 + 1332800

                                               = 1450400

                                               = 1450.4 KN[tex]m^{2}[/tex]

Total pressure exerted by the liquids at the base is 1450.4 KN[tex]m^{2}[/tex].

Answer:

B. Not

C. Positively

A. Attraction

Answer:

Ello, estoy aquí para ayudar, pero hablo español con optimismo, comprenderá lo que estoy diciendo. Intentaré ayudarlo. Espero que tengas un buen dia <3

Explanation:

Answer:

2. kinetic energy = total energy - potential energy

Explanation:

The total energy of a system is the addition of kinetic and potential energy of the system. Kinetic energy can be regarded as form of energy posses by an object when it's in motion

Total energy = kinetic energy + potential energy

(If we make Kinectic energy the subject of the formula, we have)

kinetic energy = total energy - potential energy

Answer:

utrhh

Explanation:

hrtyrt

Explanation:

the answer is b

the second one is a

Answer:a.Dry cell

Explanation: A dry cell is a type of electric battery, commonly used for portable electrical devices like a flashlight

Answer:a.Dry cell

Explanation:

Answer:

B: Pure Substance

Explanation:

Answer:

1

Explanation:

4+5 =9

5n to the right

Answer:

Final velocity of ball B V2 = 8 m/s

Explanation:

Given:

Mass of Ball A M1 = 12 gram

Mass of Ball B M2 = 36 gram

Initial velocity of ball A U1 = 15 m/s

Initial velocity of ball B U2 = 5 m/s

Final velocity of ball A V1 = 6 m/s

Find:

Final velocity of ball B V2

Computation:

Using conservation of momentum;

M1U1 + M2U2 = M1V1 + M2V2

(12)(15) + (36)(5) = (12)(6) + (36)(v2)

180 + 180 = 72 + (36)(v2)

Final velocity of ball B V2 = 8 m/s

Explanation:

beacuse light is mixture of many different colours,each with different frequency

Answer:

The crest to trough distance = 8 m

Explanation:

Given that,

The amplitude of a particular wave is 4.0 m.

We need to find the crest to trough distance.

We know that,

Amplitude = The distance from the base line to the crest or the the distance from the baseline to the trough.

It means,

Distance from crest to trough = 2(Amplitude)

= 2(4)

= 8 m

Hence, the crest to trough distance is equal to 8 m.

Answer:

The force of the air on the skydiver's body is:

[tex]F_{air}=637.7\: N[/tex]

Explanation:

Let's recall that when an object reached terminal velocity, the force of the air acting is equal to the weight of the object, so the net force will be zero, that is why the object falls at a constant speed.

Then we have:

[tex]F_{air}=W=mg[/tex]

where:

m is the mass of the skydiver (65 kg)

g is the gravity acceleration (9.81 m/s²)

Therefore, the force of the air on the skydiver's body is:

[tex]F_{air}=65*9.81=637.7\: N[/tex]

I hope it helps you!

Answer:

30,000 kgm/s

Explanation:

m = 1000 kg

v = 30 m/s

Plug those values into the equation:

p = mv

p = (1000 kg)(30 m/s)

p = 30,000 kgm/s

The momentum of a 1000 kg sports car traveling at 30 m/s is 30,000 kgm/s.Linear momentum = Mass x Speed.

The product of an object's mass, m, and its velocity, v, is the vector quantity known as linear momentum. It is represented by the letter "p," which is also used to denote momentum.

Mass of car = 1000 kg

Speed by which car moves = 30 m/s. The momentum of the car =?

Recall that:

Linear momentum = Mass x Speed

= 1000 kg x 30 m/s.

= 30,000 kgm/s

The sum of an object's mass (m) and velocity (v) is known as the object's linear momentum. An equation can be used to explain this relationship. Momentum is defined as the body's mass times its velocity. P = m times v, etc.

Therefore,  the momentum of a 1000 kg sports car is 30,000 kgm/s if travels at 30 m/s.

Learn more about momentum, here:

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Answer:

2¹⁶ⁿ

Explanation:

2ⁿ¯⁴ × 16¹⁺ⁿ / 8¯ⁿ × 4¯⁴ⁿ

The above expression can be simplified as follow:

2ⁿ¯⁴ × 16¹⁺ⁿ / 8¯ⁿ × 4¯⁴ⁿ

Recall:

16 = 2⁴

8 = 2³

4 = 2²

Thus,

2ⁿ¯⁴ × 16¹⁺ⁿ / 8¯ⁿ × 4¯⁴ⁿ

= 2ⁿ¯⁴ × 2⁴⁽¹⁺ⁿ⁾ / 2³⁽¯ⁿ⁾ × 2²⁽¯⁴ⁿ⁾

= 2ⁿ¯⁴ × 2⁴⁺⁴ⁿ / 2¯³ⁿ × 2¯⁸ⁿ

Recall:

Mᵃ × Mᵇ = Mᵃ⁺ᵇ

2ⁿ¯⁴ × 2⁴⁺⁴ⁿ / 2¯³ⁿ × 2¯⁸ⁿ

= 2⁽ⁿ¯⁴⁾⁺⁽⁴⁺⁴ⁿ⁾ / 2¯³ⁿ⁺⁽¯⁸ⁿ⁾

= 2ⁿ¯⁴⁺⁴⁺⁴ⁿ/ 2¯³ⁿ¯⁸ⁿ

= 2⁵ⁿ / 2¯¹¹ⁿ

Recall:

Mᵃ / Mᵇ = Mᵃ¯ᵇ

2⁵ⁿ / 2¯¹¹ⁿ = 2⁵ⁿ¯⁽¯¹¹ⁿ⁾

2⁵ⁿ / 2¯¹¹ⁿ = 2⁵ⁿ⁺¹¹ⁿ

2⁵ⁿ / 2¯¹¹ⁿ = 2¹⁶ⁿ

Therefore,

2ⁿ¯⁴ × 16¹⁺ⁿ / 8¯ⁿ × 4¯⁴ⁿ = 2¹⁶ⁿ