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Vanyuwa [196]
3 years ago
14

What are the signs of a chemical change

Physics
1 answer:
Rom4ik [11]3 years ago
5 0
Gas or bubbles are formed
Heat, light, or sound is given off
Change in color
Different taste or smell (never taste or smell anything in a chemical lab, cause if u do bad reactions may occur to your body, unless directed to do so.)
New substance is formed (a precipitate)
<span>Temperature (exothermic or endothermic reactions) ( exothermic RELEASES heat energy) (endothermic ABSORBS energy)</span>
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A battery does 2.186 J of work to transfer 0.033 C of charge from the negative to the positive terminal. What is the emf of this
sladkih [1.3K]

Answer:

66.24 Volts

Explanation:

W = Amount of work done in moving the charge from negative to positive terminal = 2.186 J

Q = Amount of charge being moved from negative to positive charge = 0.033 C

ΔV = EMF of the battery

Amount of work done in moving the charge from negative to positive terminal is given as

W = Q ΔV

2.186 = (0.033) ΔV

ΔV = 66.24 Volts

4 0
3 years ago
if the speed of sound through the air is rounder 80 meters per second what will be the change in temperature of the air​
d1i1m1o1n [39]

hope it is if the speed in air is larger by 80m/s what is change in temperature.

Explanation:

hope this helps you

............

8 0
3 years ago
A pesky rabbit has been feeding on Mrs. Cromwell’s prized flowers. In order to put an end to this she devised the simple trap be
Ivahew [28]

Answer:

The minimum diameter of the stick to bear the normal stress as 100 psi is 0.1785 in.

Explanation:

Taking moment along point A

\sum M_A=0\\F_{BC} sin 60 \times 48 -13 \times 8=0\\F_{BC}=2.502 lb_f

Also normal stress is given as 100 psi

Now

                      \sigma=\frac{F}{A}\\100=\frac{2.502}{\pi \frac{d^2}{4}}\\d^2 =\frac{4 \times 2.502}{100 \pi }\\d^2=0.031856\\d=\sqrt{0.031856}\\d=0.1785 inch

The minimum diameter of the stick to bear the normal stress as 100 psi is 0.1785 in.

4 0
3 years ago
How does the movement of particles of matter change when temperature decreases
Zanzabum
INCREASE in temperature of the material practically increase the energy of the particles. which increases their motion due to increase in energy . thus when the temperature is decreased the energy level decreases which causes the particle's motion to slow down.. the motion of the particle is highly reduced when the temperature is lowered
4 0
3 years ago
What is the mass of 2.5 mol of Ca, which has a molar mass of 40 g/mol?
ipn [44]

Answer:100 g of ca

Explanation:

4 0
3 years ago
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