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Anon25 [30]
3 years ago
9

1. In our counting unit, an OWL is 7 items.

Chemistry
1 answer:
Marrrta [24]3 years ago
8 0

Explanation:

1) If we have 1/2 OWLs of Snicker bars, then number of items or Snicker bars :

1 OWL = 7 items (given)

\frac{1}{2}\times 7 items=3.5 items

We have 3.5 Snickers bars.

2) If we have 100 OWLs of pencils, then number of items or pencils :

1 OWL = 7 items (given)

100\times 7 items=700 items

We have 700 pencils.

3) If we have 2 OWLs of iron atom, then number of iron atoms :

1 OWL = 7 items (given)

2\times 7 items=14 atoms of iron

We have 14 atoms of iron.

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1. Calculate the energy of a photon with a frequency of 3x1015 Hz.<br> ?????
Afina-wow [57]

Answer:

1.99 x 10⁻¹⁸J

Explanation:

Given parameters:

Frequency of the wave  = 3 x 10¹⁵Hz

Unknown:

Energy of the photon  = ?

Solution:

To solve this problem, we use the expression below;

     E  = hf

Where E is the energy, h is the Planck's constant and f is the frequency

Now insert the parameters and solve for E;

     E  = 6.63 x 10⁻³⁴ x 3 x 10¹⁵ = 19.9 x 10⁻¹⁹J or 1.99 x 10⁻¹⁸J

6 0
3 years ago
Which of the following is the quantum number set for an electron in the 3rd energy level, dumb-bell shaped orbital, on the z-axi
Juli2301 [7.4K]

Answer:

Explanation:

Principal quantum no "n" = 3

Azimuthal quantum no "l"= 1

Magnetic quantum no "m"= +1/2

Over all is 3pz

5 0
2 years ago
How many atm is 25.0 psi?
cricket20 [7]

Answer:

1.70115 or 1.70 atm

Explanation:

1 psi is equal to 0.068046 atm.

6 0
3 years ago
If 10.57 g of magnesium reacts completely with 6.96 g of oxygen, what is the percent by mass of oxygen in magnesium oxide? Round
Deffense [45]

Answer:

39.7 %

Explanation:

magnesium + oxygen ⟶ magnesium oxide

   10.57 g         6.96 g               17.53 g

According to the <em>Law of Conservation of Mass</em>, the mass of the product must equal the total mass of the reactants.

Mass of MgO = 10.57 + 6.96

Mass of MgO = 17.53 g

The formula for mass percent is

% by mass = Mass of component/Total mass × 100 %

In this case,

% O = mass of O/mass of MgO × 100 %

Mass of O = 6.96 g

Mass of MgO = 17.53 g

% O = 6.96/17.53 × 100

% O = 0.3970 × 100

% O = 39.7 %

5 0
3 years ago
A rock dropped in a graduated cylinder raises the level of water from 20 mL to 35 mL. The rock has a mass of 45 g. What is the d
Brut [27]
I think 15 I might be wrong
7 0
3 years ago
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