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lorasvet [3.4K]
3 years ago
13

What is the width of this penny?

Chemistry
1 answer:
sergey [27]3 years ago
3 0

Answer:

D. 1.2 cm

Explanation:

1st, determine the units. We see that our ruler is in cm.

This rules out A and C.

2nd, determine answer.

We see that the penny extends past 1 and ends at 0.2.

So, the total is 1.2 cm.

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1) What is the formula for calculating weight
MatroZZZ [7]

Weight we calculate using W= force multiplied to displacement

Mass SI unit is Kg

Weight SI unit is Newton (N)

Mass

7 0
3 years ago
Which of the following statements holds true for a chemical change?
ad-work [718]

Answer : The correct option is C.

Explanation :

Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.

The molecular structure of a substance changes in a chemical reaction is a chemical change.

  • Change in molecular structure means that there is a breaking and formation of bonds in a molecule.

The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.

The reaction of hydrogen with oxygen is,

H_2(g)+O_2(g)\rightarrow 2H_2O(l)

In this reaction, the H-H bond is break and O-H bond is form.


6 0
3 years ago
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3. A helium laser emits light with a wavelength of 6.33 x 10^-7m. What is
HACTEHA [7]

Answer:

4.52 x 10¹⁴ cycles/s

Explanation:

From c = f·λ => f = c/λ = (3.0 x 10⁸ m/s)/(6.63 x 10⁻⁷m) = 4.52 x 10¹⁴ cycles/s.

f = frequency = ?

λ = wavelength = 6.63 x 10⁻⁷ meter

c = speed of light in vacuum = 3.0 x 10⁸ meters/s

7 0
3 years ago
Calculate the energy required to heat 406.0mg of cyclohexane from 33.5°C to 38.9°C . Assume the specific heat capacity of cycloh
N76 [4]

Answer:

Q = 4.056 J

Explanation:

  • Q = m<em>C</em>ΔT

∴ m = 406.0 mg = 0.406 g

∴ <em>C </em>= 1.85 J/g.K

∴ T1 = 33.5°C ≅ 306.5 K

∴ T2 = 38.9°C = 311.9 K

⇒ ΔT = 311.9 - 306.5 = 5.4 K

⇒ Q = (0.406 g)(1.85 J/gK)(5.4 K)

⇒ Q = 4.056 J

6 0
3 years ago
Convert 2.345 centimeters cubed to inches cubed. 1inch = 2.54cm
GalinKa [24]

Answer:

0.92322835

Explanation:

0.92322835 rounded= 0.9 or 0.92

3 0
3 years ago
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