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Sphinxa [80]
3 years ago
15

Which of the following measurements is expressed to three significant figures?

Chemistry
2 answers:
Norma-Jean [14]3 years ago
6 0

Answer:

D

Explanation:

it goes past the decimal three places

LenKa [72]3 years ago
4 0

Answer:

C

Explanation:

A is  1 sig fig

B is 4 sig fig

C is 3 sig fig

D is 2 sig fig

Decimal places do not necessarily determine sig figs.

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Which burns faster, a large log or the same log cut into small sticks of wood?
Harlamova29_29 [7]

Answer: Small sticks of wood would burn faster.

Explanation:

Rate of a reaction is the speed which a reaction takes place.

Rate of a reaction depends on the surface area of the particles. More is the surface area, more will the rate of reaction as more of the particles surface would be exposed for the reaction to occur.

Surface area is increased by decreasing the size of the particles.

Thus a large log will burn slower as compared to the same log cut into small sticks of wood as lesser area will be exposed to air and thus rate of burning will be slow.

8 0
3 years ago
The correct answer (reported to the proper number of significant figures) to the
siniylev [52]

Answer:168.912

Explanation:

7 0
2 years ago
The daily dose for aspirin recommended by doctors is 81 mg/ day to reduce heart disease. a) In a week how many milligrams are ad
V125BC [204]

Answer:

a)567mg

b)0.567 grams

Explanation:

There are 7 days in a week, so we multiply the number of weeks by the number of daily dosage.

81mg*7=567mg

1 gram is 1000 mg

we divide 567 by 1000 to get the value in grams

7 0
2 years ago
A light strikes the boundary of a medium at a 45 degree angle. Instead of entering the second medium, the light reflects back in
Dahasolnce [82]

Answer:

D It must be equal to 1.00

Explanation:

The refraction in the second medium must be equal to 1. The refraction index is given as the ration of the angle of incidence to the angle of refraction. This is given as a fraction. In other words:

\frac{sin\theta _{i} }{sin\theta _{r} }  = n

where Θ₁ and Θ₂ are angles of incidence an refraction, and n is the refractive index.

At a critical angle, the refraction is equal to the reflection inside the medium. This results in a phenomenon called total internal reflection where light is reflected internally in the medium.

6 0
3 years ago
Use the unbalanced equation NH3 + O2 = NO + H2O, what is the mole ratio between NH3 and NO
kirill115 [55]
<span>The first thing that needs to be done in order to answer the question above is to balance first the chemical equation by seeing to that the number of moles of a certain element on the reactant side is equal to the number of moles in the product side. 4NH3 + 5O2  4NO + 6H2O The mole fraction between the NH3 and NO is therefore 4:4 or 1:1.</span>
4 0
3 years ago
Read 2 more answers
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