2 years ago

Which of the following is a clue of a chemical change?

Physics

2 answers:

ollegr [7]2 years ago

8 0

The answer is D , when u mix the two ingredients it forms another by chemical reaction

Grace [21]2 years ago

6 0

The aswere is D.
Because its involve two material and causes reaction to make another form

You might be interested in

For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?

ira [324]

Answer:

B.14 your welcome!

Explanation:

6 0

2 years ago

What is a galvanic cell??

Kobotan [32]

Its an electrochemical cell that derives electrical energy from spontaneous redox reactions taking place within the cell.

8 0

2 years ago

A river flows due south with a speed of 2.0 m/s. You steer a motorboat across the river; your velocity relative to the water is

neonofarm [45]

Answer:

a) 25.5°(south of east)

b) 119 s

c) 238 m

Explanation:

solution:

we have river speed $v_{r}$ =2 m/s

velocity of motorboat relative to water is $v_{m/r}$ =4.2 m/s

so speed will be:

a) $v_{m}$ = $v_{r}$ + $v_{m/r}$

solving graphically

$v_{m}=\sqrt{v^2_{r}+v^2_{m/r}}$

=4.7 m/s

Ф= $tan^{-1} (\frac{v_{r}}{v_{m/r}} )$

=25.5°(south of east)

b) time to cross the river: t= $\frac{w}{v_{m/r}}$ = $\frac{500}{4.2}$ =119 s

c) d= $v_{r}t$ =(2)(119)=238 m

note :

pic is attached

6 0

3 years ago

The lever allows Jeff 150 pounds to lift a much greater weight 600 pounds because A) the larger force is applied over a longer d

kvasek [131]

Jeff uses all of his weight to lift the 600 lbs. C is your answer i do believe

4 0

2 years ago

A child is sledding. He starts at the top of the hill with a velocity of zero, and 3 seconds later he is speeding down the hill

Flauer [41]

Magnitude of acceleration = (change of speed) / (time for the change) =

(12 m/s - 0) / (3 sec) =

12/3 = <em>4 m/s²</em>

What's a challenge question ? Have we all passed the event horizon
and been spaghettified without knowing it ?

8 0

2 years ago