Classify the following as chemical or physical change: (a) adding sugar to lemonade, (b) plants using CO2 and H2O to form O2 and sugar, (c) boiling water, (d) frying an egg, (e) rust forming on metal, (f) fruit rotting, (g) removing salt from water by evaporation.

Answers

Answer 1

Answer:

A change is said be chemical change when a change in chemical property of a substance occurs and the new substance is chemically different from old one. A change is said to be physical change when only physical properties change but chemically the substances remain same.

a) adding sugar to lemonade- It is a physical change because sugar is being dissolves in the lemonade. There is no change in the chemical property.

b) plants using CO₂ and H₂O to form O₂ and sugar is a chemical change because new products which are chemically different are formed.

c) boiling water - is a physical change because only the physical state from liquid to gas changes. Chemically water retains its properties.

d) frying an egg - the properties of egg changes after frying. Hence, it is a chemical change. A fried egg does not retain properties of an uncooked one.

e) rust forming on metal- is a chemical change. Corrosion ( rusting) is a chemical change as rust is chemically different from the metal.

f) fruit rotting - is a chemical change. When microbes act on the fruit, the fruit starts to rot.

g) removing salt from water by evaporation- it is a physical change. The salt and water retain their physical properties as mixture and when separated by evaporation process.

Answer 2

Answer: (a) physical (b) chemical (c) physical (d) chemical (e) chemical (f) chemical (g) physical

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Answers

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The current through a 10-ohm resistor connected to a 120-v power supply is

Answers

Answer:

12 A

Explanation:

Voltage, V = 120 V

Resistance, R 10 ohm

By using ohm's law

V = i x R

where, i is the current

i = V / R

i = 120 / 10

i = 12 A

thus, the current is 12 A.

If you have a mass of 55 kg and you are standing 3 meters away from your car, which has a mass of 1233 kg, how strong is the force of gravity between you and the car ?

Answers

Answer:

5.03×10¯⁷ N

Explanation:

From the question given above, the following data were obtained:

Mass of the person (M₁) = 55 Kg

Mass of the car (M₂) = 1234 Kg

Distance apart (r) = 3 m

Gravitational constant (G) = 6.673×10¯¹¹ Nm²/Kg²

Force (F) =?

The force between the person and his car can be obtained as follow:

F = GM₁M₂ / r²

F = 6.673×10¯¹¹ × 55 × 1234 / 3²

F = 6.673×10¯¹¹ × 67870/ 9

F = 5.03×10¯⁷ N

Thus, the force between the person and his car is 5.03×10¯⁷ N

The function of a capacitor in an electric circuit is to?A. measure the amount of current in the circuit.
B. increase circuit power
.C. allow current flow between its plates.
D. store electric charges.

Answers

Well let's see:

A). No. A capacitor doesn't measure anything.

B). No. The power delivered to the circuit is determined by
      the battery or power supply and all the things in
the circuit that dissipate energy. A capacitor doesn't
do any of these things.

C). No. If any current actually flows between its plates,
   the capacitor is shot and can't do its job, and
   must be replaced.

D). Yes. A capacitor stores charges on its plates, and
electrical energy in the field between its plates.

Answer:

D. Stores electric charges

Dr. Martin Luther King, Jr., used which method to draw attention to the civil rights movement?a. whatever means necessary
b. violence and intimidation
c. passive resistance
d. running for political office

Answers

It is c.Hoped this helped.~Bob Ross

a train is moving at 4.0 km/h. It accelerates at 60 km/h/s for 0.75 h. What is its speed by the of the 0.75 h

Answers

Answer:

49 km/h

Explanation:

60 km/h acceleration for 0.75 hours.

60 × 3/4 = 45 km/h

Take the acceleration and add it to the speed the train was already moving at:

45 + 4 = 49km/h

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