1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
riadik2000 [5.3K]
3 years ago
9

A light year measure the distance a lightbeam can travel in one year one light year is equivalent to 9500000000000 km why do sci

entist use light years to measure distances in the universe.
Light years are the only practical unit for measuring the distance of space

Light years tell us about the temperature distance and age of their celestial bodies

Light years are the most accurate form of measurement for universal purposes

Light years measure the age of celestial bodies by determining how bright the light is
Chemistry
1 answer:
Nina [5.8K]3 years ago
8 0

Answer:

Light years are the only practical unit for measuring the distance of space

Explanation:

Practical... aka logical.

You might be interested in
Fill in the coefficients that will balance the following reaction: a0NaCl + a1FeO → a2Na2O + a3FeCl2
Helen [10]

Answer:

2NaCl + FeO —-> 2Na2O + FeCl2

Explanation:

4 0
3 years ago
Helpppppppppp please <br> what did max planck discovery?
tensa zangetsu [6.8K]

Answer:

Max Planck discovered the quantum of action

Explanation:

4 0
3 years ago
Read 2 more answers
Give the coordination number of the central metal ion in the following complex ions.
melomori [17]

Answer:

a). Coordination no. of [Ni(en)_2(NH_3)_2]^2+ = 6

b). Coordination no. of [Fe(en)(ox)Cl_2]^2- = 6

Explanation:

Coordination number is defined as number of donar atoms bonded to the central atom of the complex ion.

a). Coordination no. of [Ni(en)_2(NH_3)_2]^2+ = 6

en or ethylenediamine is a bidentate ligand.

In bidentate ligand, two atoms directly bonded to the central atom.

NH3 is a unidentate ligand.

So, coordination no.= No. of bidentate ligand x 2 + No. of unidentate ligand

                                = 2\times 2 + 2 = 6

b). Coordination no. of [Fe(en)(ox)Cl_2]^2- = 6

Ethylenediamine (en) is a bidentate ligand.

oxalate ion (ox) is also a bidentate ligand.

Cl is a unidentate ligand

So, coordination no.= No. of bidentate ligand x 2 + No. of unidentate ligand

                                = 2\times 2 + 2 = 6

8 0
3 years ago
3. A thin lead apron is used to protect patients from harmful X rays. If the sheet measures 75.0 cm by 55.0 cm by 0.10 cm, and t
DanielleElmas [232]

Answer:

4.67 kg

Explanation:

Given data

  • Dimensions of the lead sheet: 75.0 cm by 55.0 cm by 0.10 cm
  • Density of lead: 11.3 g/cm³

Step 1: Calculate the volume of the sheet

The volume of the sheet is equal to the product of its dimensions.

V = 75.0 cm \times  55.0 cm \times 0.10 cm = 413 cm^{3}

Step 2: Calculate the mass of the sheet

The density (ρ) is equal to the mass divided by the volume.

\rho = \frac{m}{V} \\m = \rho \times V = \frac{11.3g}{cm^{3} }  \times 413cm^{3} = 4.67 \times 10^{3} g = 4.67 kg

6 0
2 years ago
Give an example of each of the following chemical changes.
Andrews [41]

Answer:

Give an example of each of the following chemical changes.

(a) A photochemical reaction involving

(i) silver salt

(ii) water

(b) A reaction involving

(i) blue solution

(ii) formation of dirty green precipitate

(c) Two gases combine to form white solid.

(d) A reaction where colour change is noticed.​

Explanation:

a) A photochemical reaction involving  silver salt is used in black and white photography.

AgCl breaks down and converts into Ag during this photochemical reaction.

(ii) Photochemicalreaction involving water takes place in plants during the photosynthesis process.

Plants prepare food(carbohydrate) by using sunlight water and CO2 gas.

(b) A reaction involving

(i) blue solution:

For example reaction of copper sulfate solution with an iron nail.

When an iron nail is placed in CuSO4 blue color solution, then it changes to green color and reddish-brown solid deposits at the bottom of the container.

(ii) Reaction of ferrous sulfate with NaOH forms a dirty green precipitate of ferrous hydroxide.

(C) Two gases combine and form a white solid:

For example when HCl gas reacts with ammonia gas, then a white solid of ammonium chloride will be formed.

(d)  A reaction where the color change is noticed.:

When an iron nail is placed in CuSO4 blue color solution, then it changes to green color and reddish-brown solid deposits at the bottom of the container.

7 0
3 years ago
Other questions:
  • The periodic law states that the physical and chemical properties of elements are periodic functions of their?
    14·1 answer
  • If the azeotropic mixture is 72% perchloric acid by mass, what is the mole percent of water in the azeotrope?
    11·1 answer
  • Helpppppppppppppppppppppppppppppppppp
    11·1 answer
  • Which action is the best example of a direct observation
    10·2 answers
  • Can anyone answer 10.4? (45 points if correct)
    15·1 answer
  • Help me!!!<br>will give the brainliest!!<br>plz answer correctly<br>Urgent!!!​
    11·2 answers
  • A solution of cough syrup contains 5.00% active ingredient by volume. If the total volume of the bottle is 44.0 mL , how many mi
    15·1 answer
  • When methyloxirane is treated with HBr, the bromide ion attacks the less substituted position. However, when phenyloxirane is tr
    7·1 answer
  • Two answer multiple choice-- please help!
    5·1 answer
  • Which of the following statements about elements is not true?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!