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e-lub [12.9K]
3 years ago
8

Help me please thank you

Chemistry
1 answer:
Damm [24]3 years ago
5 0
The atomic number is equal to proton number : 30
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If a young girl learned that it would be 0° C, or 32° F, the next
Ad libitum [116K]

Answer:

Cold

Explanation:

Because 0°C And below or 32°F Refers To Cold Weather

7 0
2 years ago
A photon has an energy of 2.93 × 10 to the power of -25 J. What is its frequency? What type of electromagnetic radiation is this
Svet_ta [14]
You need to know the energy frequency relationship for photons, which is thanks to Max Planck:

Photon Energy = Planck constant x Frequency

Rarranged:
Photon Energy / Planck Constant = Frequency

Planck Constant = 6.63x10^-34

2.93x10^-25 / 6.63x10^-34 = Frequency

6 0
3 years ago
Read 2 more answers
How do living organisms use nitrogen
hoa [83]

Answer:

it produces amino acids and proteins. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.

8 0
2 years ago
A solid is 5 cm tall, 3 am wide, and 2 cm thick. It has a mass of 135 g. What is the solid's density?
gizmo_the_mogwai [7]

<u>Answer:</u>

density of solid = 4.5 g/cm³

<u>Explanation:</u>

density = mass ÷ volume

• We know the mass of the object (135 g). We need to calculate the volume:

Volume = length × width × thickness

             = 5 cm × 3 cm × 2 cm

             = 30 cm³

• Now we can calculate the solid's density:

density = 135 g ÷ 30 cm³

            = 4.5 g/cm³

4 0
2 years ago
if a standard die is rolled twice what is the probability of getting a perfect square,then a number that is less than 5.
solniwko [45]
There are three perfect squares in a standard die; 1, 2, 4. If there is two standard dies, then the probability of getting a perfect square is 1/3 x 1/3 = 1/9. 
There are 4 numbers less than 5 in a standard die, making it 1/4 x 1/4=1/16. 
5 0
3 years ago
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