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2 years ago

5

What are some examples of things you expect to see when observing a chemical reaction?

1 answer:

just olya [345]2 years ago

7 0

Change of color, change of temperature, change in the solubility, production of gas, production of light, electricity or precipitation. Release of heat. Explosion. Production of new compounds.

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At which point on the roller coaster will the car have the greatest amount of Kinetic energy?

Elena-2011 [213]

I’m going to say the answer is most likely X because memetic energy is energy being used at that moment. Because the coaster is going fastest at X we can assume that the answer is X

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3 years ago

A sample of iron has the dimensions of 2 cm x 3 cm x 2 cm. If the mass of this

77julia77 [94]

Answer: Volume iron = 2 x 3 x 2 => 12 cm³

Mass = 94 g

D = m / V

D = 94 / 12

D = 7.833 g/cm³

Explanation:

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2 years ago

Scientists believe that ancient bacteria represents the first evidence of life on Earth. Which of these best describes the proce

almond37 [142]

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3 years ago

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An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave spherical mirror. An image is forme

julia-pushkina [17]

Answer: B. 0.6125 m

For spherical concave mirror:

Height of the object, $h_o=0.4\hspace{1mm}m$

Height of the image, $h_i=0.35\hspace{1mm}m$

Object distance, u=-0.7 m

we need to find the distance of the image, v.

These are related by the following formula:

$\frac{h_i}{h_o}=-\frac{v}{u}\\ \Rightarrow v=u\times\frac{h_i}{h_o}$

Insert the values:

$v=-(-0.7\times\frac{0.35}{0.4})=0.6125\hspace{1mm}m$

Hence, option B is the correct.

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2 years ago

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