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3 years ago

PLEASE HELP 5TH GRADE SCIENCE Select the statement that correctly compares the sun and a comet.

Chemistry

2 answers:

Dima020 [189]3 years ago

8 0

Answer:

Explanation:

The sun is in the center of the solar system, planets, comets, and other things orbit around it

Basile [38]3 years ago

3 0

Answer:

Explanation:

The sun is at the center of the solar system, and the comet orbits around it.

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In the chemical reaction, mg + 2hcl mgcl2 + h2 how many moles of hcl are needed to completely react with 3.5 moles of mg?

Luba_88 [7]

The balanced equation for the above reaction is as follows;
Mg + 2HCl ---> MgCl₂ + H₂
stoichiometry of Mg to HCl is 1:2
number of Mg moles reacted - 3.5 mol
1 mol of Mg reacts with 2 mol of HCl
therefore 3.5 mol of Mg requires - 2 x 3.5 = 7.0 mol of HCl
number of HCl moles required to completely react with 3.5 mol of Mg is 7.0 mol of HCl

6 0

3 years ago

How does nuclear fission occur?

olasank [31]

A
Since it is the nucleus that splits and not the the neutrons

3 0

2 years ago

Using the Rydberg formula, calculate the initial energy level when an electron in a hydrogen atom transitions into n= 2 and emit

EleoNora [17]

Answer:

Explanation:

Using the Rydberg formula as:

$\frac {1}{\lambda}=R_H\times Z^2\times (\frac {1}{n_{1}^2}-\frac {1}{n_{2}^2})$

where,

λ is wavelength of photon

R = Rydberg's constant (1.097 × 10⁷ m⁻¹)

Z = atomic number of atom

n₁ is the initial final level and n₂ is the final energy level

For Hydrogen atom, Z= 1

n₂ = 2

Wavelength = 410.1 nm

Also,

1 nm = 10⁻⁹ m

So,

Wavelength = 410.1 × 10⁻⁹ m

Applying in the formula as:

$\frac {1}{410.1\times 10^{-9}}=1.097\times 10^7\times 1^2\times (\frac {1}{n_{1}^2}-\frac {1}{2^2})$

Solving for n₁ , we get

n₁ ≅ 1

3 0

4 years ago

Read 2 more answers

PLEASE HELP.!

Agata [3.3K]

Answer:

Explanation:

6 0

3 years ago

Letters B and C on this model show us daytime on Earth. Both locations have daytime because of A) Earth's tilt on its axis. B) E

ch4aika [34]

Answer is D earths distance from the sun

7 0

3 years ago