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3 years ago

11

PLZZZ HURRY a student is performing experiments on a particular substance which statement is an observation of a chemical proper

ty of the substance
a- it sinks WILL MARK BRAINLEST PLZZZZ HURRY
b-it freezes
c-it reacts with air
d- its viscosity increases

2 answers:

Katena32 [7]3 years ago

7 0

It’s d all the other answer would not be a chemical property

Scilla [17]3 years ago

5 0

Answer:

C it reacts with air

Explanation:

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One type of sunburn occurs on exposure to UV light with a wavelength in the vicinity of 325 nm. What is the energy of a mole of

andrew11 [14]

Answer: Energy of a mole of these photons is $0.368\times 10^6Joules$

Explanation:

The relationship between wavelength and energy of the wave for 1 mole follows the equation:

$E=\frac{Nhc}{\lambda}$

E= energy

N= avogadros number = $6.023\times 10^{23}$

$\lambda$ = wavelength of the wave = $325\times 10^{-9}m$ $1nm=10^{-9}m$

h = Planck's constant = $6.626\times 10^{-34}Js$

c = speed of light = $3\times 10^8m/s$

$E=\frac{6.023\times 10^{23}\times 6.626\times 10^{-34}\times 3\times 10^8m/s}{325\times 10^{-9}m}$

$E=0.368\times 10^6Joules$

Thus the energy of a mole of these photons is $0.368\times 10^6Joules$

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3 years ago

A small block has constant acceleration as it slides down a frictionless incline. The block is released from rest at the top of

natita [175]

Answer:

2.58 m/s

Explanation:

We can use the following equation of motion to find out the constant acceleration of the block:

$v^2 - v_0^2 = 2a\Delta s$

where v = 3.8 m/s is the final velocity after it has traveled 7.4 m, $v_0 = 0$ is the initial velocity of the block when it starts from rest, , and $\Delta s = 7.4$ is the distance traveled.

$3.8^2 - 0 = 2*a*7.4$

$14.44 = 14.8a$

$a = 14.44 / 14.8 = 0.98 m/s^2$

We can use the same motion equation to calculate block speed at the end of 3.4m track

$v_2^2 - 0 = 2*0.98*3.4$

$v_2^2 = 6.63$

$v_2 = \sqrt{6.63} = 2.58 m/s$

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3 years ago

Which object is least likely to allow light to pass through it?

jeka57 [31]

a tree truck

is the answer i hope this helps you xD

6 0

3 years ago

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What is the reaction for P₄ + 5 O₂ --> 2 P₂O₅

mixas84 [53]

Answer:

Combination or synthesis

Explanation:

The reaction is a combination or synthesis reaction in which two or more substances combines to give a single product.

In such a reaction there is formation of compounds from the union of their constituent elements.

The driving force for such reactions is the large and negative heat of formation of the product.

So, this is a combination reaction.

7 0

3 years ago

A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds

Inessa05 [86]

Answer:

A body travels 10 meters during the first 5 seconds of its travel,and a total of 30 meters over the first 10 seconds of its travel

20miles / 5sec = 4miles /sec would be the average speed for the last 20 m

Explanation:

The answer is 4 m/s.

In the first 5 seconds, a body travelled 10 meters. In the first 10 seconds of the travel, the body travelled a total of 30 meters, which means that in the last 5 seconds, it travelled 20 meters (30m + 10m).

The relation of speed (v), distance (d), and time (t) can be expressed as:

v = d/t

We need to calculate the speed of the second 5 seconds of the travel:

d = 20 m (total 30 meters - first 10 meters)

t = 5 s (time from t = 5 seconds to t = 10 seconds)

Thus:

v = 20m / 5s = 4 m/s

PLEASE GIVE BRAINIEST!! HOPE THIS HELPS

5 0

3 years ago