All categories

3 years ago

Describe three clues that tell you that you are o serving a chemical change. Give an Example of each clues you described.

Physics

1 answer:

sergiy2304 [10]3 years ago

3 0

1) the object would change color (start to rust or just chnage color)

2) The new substance is ireversable (cant chnage back to original form)

3)theres gas formations (its can change into a gas property)

You might be interested in

On a highway, a car is driven 80. kilometers

nydimaria [60]

The average speed of the car for the entire trip can be calculate by using:

$v=\frac{S}{t}$

where S is the total distance covered by the car, and t is the total time taken.

The total distance travelled by the car is:

$S=80 km+50 km+40 km=170 km$

while the total time taken is:

$t=1.00 h+0.50 h+0.50 h=2.00 h$

so, the average speed of the car is:

$v=\frac{S}{t}=\frac{170 km}{2.00 h}=85 km/h$

so, the correct answer is (3) 85 km/h.

7 0

3 years ago

Read 2 more answers

Helpppppppppppppppppppppppppppopppppppppp

harkovskaia [24]

Answer:

I think it's 2 the photo is hard to tell what they are exactly talking about.

7 0

2 years ago

6. A person lifts a package weighing 75 N. If she lifts it 1.2 m off the floor,

balandron [24]

Answer:

90 Joules

Explanation:

75×1.2=90.

i believe it is this

7 0

2 years ago

H e l p a h o m i e o u t t h a n k s

finlep [7]

Uh it’s D i’m pretty sure

4 0

2 years ago

Calculate the current in a circuit if 500 C of charge passes through it in 10 minutes. *

Sloan [31]

Answer:

Choice a. Approximately $0.83\; \rm A$ on average.

Explanation:

The electric current through a wire is the rate at which electric charge flows through a cross-section of this wire.

Assume that electric charge of size $Q$ flowed through a wire cross-section over a period of time $t$ . The average current in that wire would be:

$\displaystyle I = \frac{Q}{t}$ .

For this question:

$Q = 500\; \rm C$ , whereas
$t = 10\; \rm \text{minutes}$ .

Therefore, the average current in this circuit would be:

$\displaystyle I = \frac{Q}{t} = \frac{500\; \rm C}{10\; \text{minutes}} = 50\; \rm C /\text{minute}$ .

However, the units in the choices are all in $\rm A$ (for Amperes.) One Ampere is equal to one $\rm C / \text{second}$ . It will take some unit conversations to change the unit of $I = 50\; \rm C/ \text{minute}$ (coulombs-per-minute) to coulombs-per-second.

$\begin{aligned}I &= 50\; \rm C/ \text{minute} \\ &= \frac{50\; \rm C}{1\; \rm \text{minute}} \times \frac{1 \; \text{minute}}{60\; \rm \text{seconds}} \approx 0.83\; \rm C/ \text{second} = 0.83 \; \rm A\end{aligned}$ .

Hence, the most accurate choice here would be choice a.

7 0

2 years ago