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ira [324]
3 years ago
9

The first method of determining the chemical composition of substances in space was to

Chemistry
2 answers:
Bas_tet [7]3 years ago
7 0

this varified answer is incorrect. the answer is analyze starlight transmitted to Earth

ehidna [41]3 years ago
5 0
<span>The first method to determine the chemical composition of a substance in space was using light. By determining red shift in the observed spectrum of light they could determine the elements they were observing. Different elements change the way light behaves and from this scientists can determine the makeup of things such as stars and nebulas.</span>
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Which type of chemical reaction occurs in Ca + Cl2 mc009-1.jpg CaCl2?
gregori [183]

Answer : The correct option is, (a) Synthesis

Explanation :

Synthesis reaction : A chemical reaction where multiple substances or reactants combine to form a single product.

It is represented as,

X+Y\rightarrow XY

Combustion reaction : A chemical reaction in which a hydrocarbon react with the oxygen to give product as carbon dioxide and water.

It is represented as,

CH_4+2O_2\rightarrow CO_2+2H_2O

Single replacement reaction : A chemical reaction in which the more reactive element replace the less reactive element.

It is represented as,

A+BC\rightarrow AC+B

In this reaction, A is more reactive element and B is less reactive element.

Double replacement reaction : It is a type of chemical reaction where a positive cation and a negative anion of two reactants exchange places to form two new products.

It is represented as,

XY+AB\rightarrow XB+AY

(X and A are the cations, Y and B are the anions)

The given reaction is, Ca+Cl_2\rightarrow CaCl_2

In this reaction, calcium combine with the chloride to form calcium chloride as a product.

Hence, the given type of reaction is a synthesis reaction.

5 0
3 years ago
Read 2 more answers
Atoms,which are always neutral in electric charge, contain electrons as well as protons and neutrons. An electron has an electri
creativ13 [48]

Answer:

3

Explanation:

Since the atom has three electrons, it has a -3 electrical charge. Since atoms are neutral, 3 protons are needed to get the charge back to 0.

8 0
3 years ago
If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. Currently the material used
AnnZ [28]

ti\his answer is radiation

7 0
3 years ago
In a stadium, fans stand up and sit down to produce a wave across the stadium. This type of wave where the material travels perp
elena-14-01-66 [18.8K]
Transverse wave is <span>a wave vibrating at right angles to the direction of its propagation.

In short, Your Answer would be Option B

Hope this helps!</span>
7 0
3 years ago
Read 2 more answers
Which of the following characteristics indicates that an atom is unstable?
elena55 [62]

Answer:

D

Explanation:

An atom can be considered unstable in one or two ways. If it pickes up or loses an electron,it becomes electrically charged and highly reactive.Intabability can also occur in the nucleus when the number of protons and neutrons is unbalanced.

8 0
3 years ago
Read 2 more answers
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