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3 years ago

PLZZ HELP Explain how you can tell the difference between a physical and a chemical change.

Physics

1 answer:

Alecsey [184]3 years ago

7 0

Answer:

You can tell the difference between physical and chemical change by looking at the change that takes place like whether it is a permanent or temporary change.

Explanation:

physical change is temporary change and chemical change is permanent change
the original shape of the object can be restored in physical change whereas the original composition of the object will be lost in chemical change
in physical change the change is reversible whereas he chemical change is irreversible and the object takes new shape and position in this change.

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Suppose you have two small pith balls that are 5.5 cm apart and have equal charges of -29 nc?

zysi [14]

The question is missing, however, I guess the problem is asking for the value of the force acting between the two balls.

The Coulomb force between the two balls is:
$F= k_e \frac{ q_1 q_2}{r^2}$
where $k_e=8.99\cdot10^9~N m^2 C^{-2}$ is the Coulomb's constant, $q_1=q_2=29~nC=29\cdot 10^{-9}~C$ is the intensity of the two charges, and $r=5.5~cm=0.055~m$ is the distance between them.

Substituting these numbers into the equation, we get
$F=2.5~10^{-3}~N$

The force is repulsive, because the charges have same sign and so they repel each other.

6 0

3 years ago

Can any1 tell if my answer is right

jok3333 [9.3K]

Answer:

The correct answer would be C. 5.0kg

Explanation:

The mass of an object never changes unless parts of the object are taken away. In other words, although the gravitational force is different on the moon then on the earth the mass of the object would remain the same.

6 0

2 years ago

Suppose you have 600.0 grams of room temperature water (20.0 degrees Celsius) in a thermos. You drop 90.0 grams of ice at 0.00 d

IrinaK [193]

Answer:

$T_{f}$ = 7.02 ° C

Explanation:

The liquid water gives heat to melt the ice (Q₁) maintaining the temperature of 0 ° C and then the two waters are equilibrated to a final temperature.

Let's start by calculating the heat needed to melt the ice

Q₁ = m L

Q₁ = 0.090 3.33 10⁵

Q₁ = 2997 10⁴ J

This is the heat needed to melt all the ice

Now let's calculate at what temperature the water reaches when it releases this heat

Q = M $c_{e}$ (T₀ - $T_{f}$ )

Q₁ = Q

$T_{f}$ = T₀ - Q₁ / M $c_{e}$

$T_{f}$ = 20.0 - 2997 104 / (0.600 4186)

$T_{f}$ = 20.0 - 11.93

$T_{f}$ = 8.07 ° C

This is the temperature of the water when all the ice is melted

Now the two bodies of water exchange heat until they reach an equilibrium temperature

Temperatures are

Water of greater mass T₀₂ = 8.07ºC

Melted ice T₀₁ = 0ºC

M $c_{e}$ (T₀₂ - $T_{f}$ ) = m $c_{e}$ ( $T_{f}$ - T₀₁)

M T₀₂ + m T₀₁ = m $T_{f}$ + M $T_{f}$

$T_{f}$ = (M T₀₂ + 0) / (m + M)

$T_{f}$ = M / (m + M) T₀₂

let's calculate

$T_{f}$ = 0.600 / (0.600 + 0.090) 8.07

$T_{f}$ = 7.02 ° C

4 0

3 years ago

In the blanks below write what the independent variable and the dependent variable would be for each experiment. (what are you t

tiny-mole [99]

Answer:

1. independent- if you studied. dependent- test scores

2. independent- behavior of students. dependent-student grades

3. independent- what you eat. dependent- amount of gas

4. independent- which bait you use. dependent- how much fish you catch

5. independent-if you talk to the plants or not. dependent- growth

6. independent- whether you eat breakfast or not. dependent-student performance

7. independent- which animal you test. dependent- speed of the animals

8. independent- how much candy you eat. dependent- cavities or not

9. independent- if you eat no sugar or no carbs. dependent- how much weight you lose

10. independent- which thing you measure. dependent- the measurements

4 0

3 years ago

Friction causes kinetic energy to be converted into what energy

Gennadij [26K]

Friction causes kinetic energy to be converted into 'thermal energy'. The answer to this question is 'thermal energy'. An example would be if something is being rubbed against another object, there is friction and thermal energy will be produced. I hope this helps you on your assignment! You're welcome.

5 0

3 years ago