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3 years ago

Which of the following could be considered a scientific statement?

Chemistry

2 answers:

Lelechka [254]3 years ago

8 0

Answer:

B. " nuclear energy can be dangerous because of potential radiation damage "

Explanation:

B is a scientific statement as it is based on experimentation and evidence. The statement represents factual data.

A is incorrect. It is an opinion as to which soda tastes better than the other.

C is incorrect. It is an opinion as to which light is better than the other.

D is incorrect. It is statement that one should avoid electromagnetic radiation with high frequencies but the reason is not stated.

slega [8]3 years ago

6 0

B. This is the answer because this statement can be proven and is not an opinion.

You might be interested in

Mention the significance of dams and irrigation canals?

GarryVolchara [31]

Significance of dams and canals are :- 

Water is stored in dams that are built across rivers. The water is then supplied to nearby towns and cities through pipelines

Water for agricultural purposes is supplied through a system of irrigation canals

hope it helps ~

3 0

3 years ago

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

umka21 [38]

Answer:

f = 7.5 E14 s-1

Explanation:

energy emitted by photon:

E = h.c / λ.......(1)
E = h.f......(2) Planck-Einstein

∴ λ = (400nm)(m/1 E9 nm) = 4.00 E-7 m

∴ h ( Planck's constant) = 6.626070150 E-34 J.s

∴ c (velocity of light) = 3.00 E8 m/s

∴ f (frequency): photon/s

If (1) = (2):

⇒ f = c / λ = E / h

⇒ f = (3.0 E8 m/s) / ( 4.00 E-7 m) = 7.5 E14 s-1

4 0

3 years ago

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?

julsineya [31]

Electron

Atoms, compounds, and molecules undergo chemical reactions to form new substances. In general, reactions proceed to produce products which are have more stability.

These chemical reactions are possible because of the ability of substances to form chemical bonds with other substances. These formation of bonds are primarily attributed to electronic interactions (i.e. the valence or outer electrons of the atoms). of substances.

Atoms are able to form new substances by gaining, losing, or sharing electrons with other atoms.

4 0

3 years ago

In the reversible reaction in water solution nh3 + h2o ⇀↽ nh+ 4 + oh− , what acts as a bronsted-lowry acid and what acts as a br

Masja [62]

The equation is:
NH₃ + H₂O ↔ NH₄⁺ + OH⁻
base acid conj. acid conj. base

NH₃ is the proton acceptor so it considered as Bronsted-Lowry base and H₂O is proton donor so it considered as Bronsted-Lowry acid

NH₃ when accepted H⁺ it converted into NH₄⁺ (conjugate acid) and H₂O when losing H⁺ it converted into OH⁻ (conjugate base)

The question asks for acid and base
1) OH⁻ base, H₂O acid
2) H₂O acid, OH⁻ base
3) H₂O acid , NH₄⁺ acid
4) OH⁻ base, NH₄⁺ acid
5) NH₃ base, H₂O acid

so the correct answer is 2) because it is the only one containing acid then base

8 0

3 years ago

4Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)

Novay_Z [31]

Explanation:

The number acquired by an element after the lose or gain of an electron is called oxidation number.

For example, $4Fe(s) + 3O_{2}(g) \rightarrow 2Fe_{2}O_{3}(s)$

Here, oxidation number of Fe(s) is 0 and Fe in $Fe_{2}O_{3}$ is +3.

Oxidation number of O in $O_{2}(g)$ is 0 as it is present in its elemental state.

The oxidation number of O in $Fe_{2}O_{3}$ is calculated as follows.

$2(3) + 3x = 0\\6 + 3x = 0\\x = \frac{-6}{3}\\= -2$

Hence, oxidation number of O in $Fe_{2}O_{3}$ is -2.

The loss of electrons by an element or substance is called oxidation. Here, electrons are being lost by Fe(s) as an increase in oxidation state is occurring. So, Fe(s) is oxidized.

The gain of electrons by an element or substance is called reduction. Here, electrons are being added to $O_{2}$ as a decrease in its oxidation state is occurring. So, $O_{2}$ is reduced.

An element or compound which is being reduced is called oxidizing agent. Here, $O_{2}$ is the oxidizing agent.

An element or compound which is being oxidized is called reducing agent. Here, Fe(s) is the reducing agent.

5 0

3 years ago