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Fofino [41]
3 years ago
14

Which sentence is a scientific statement?

Chemistry
2 answers:
melomori [17]3 years ago
8 0

The answer is D: There is life on some other planet in the universe aside from earth


DedPeter [7]3 years ago
4 0

Answer: D.  There is life on some other planet in the universe aside from earth.

Explanation:

A scientific statement is a statement which is based upon the evidences obtain through detail experimental trials to use them to answer questions related to science.

D is the correct option, because it might have generated on comparison and observation which can be included in the evidences of life on earth and other planets of the universe.  

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The outermost shell of an atom in known as ??​
melisa1 [442]

Answer:

<em>The</em><em> </em><em>a</em><em>n</em><em>s</em><em>w</em><em>e</em><em>r</em><em> </em><em>is</em><em> </em><em>valance</em><em> </em><em>shell</em><em>.</em>

<em>Valance</em><em> </em><em>shell</em><em> </em><em>is</em><em> </em><em>the</em><em> </em><em>outermost</em><em> </em><em>shell</em><em> </em><em>of</em><em> </em><em>an</em><em> </em><em>atom</em><em> </em><em>which</em><em> </em><em>contains</em><em> </em><em>valance</em><em> </em><em>electrons</em><em> </em><em>on</em><em> </em><em>it</em><em> </em><em>of</em><em> </em><em>an</em><em> </em><em>atom</em><em> </em><em>of</em><em> </em><em>an</em><em> </em><em>elements</em><em>. </em>

<em><u>Hope</u></em><em><u> </u></em><em><u>it helps</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>

8 0
3 years ago
99<br> 96<br> 040Zr<br> +<br> 42He<br> ----&gt;<br> + "42Mo
Ahat [919]

he mass defect of the helium nucleus ⁴He₂ is 0.030377 u

Further explanation

Mass defect means the difference between the mass of particles forming an atom with an atomic mass.

Δm = mass defect ( u )

mp = mass of proton ( u )

me = mass of electron ( u )

mn = mass of neutron ( u )

M = atomic mass ( u )

A = mass number

Z = atomic number

Let us now tackle the problem !

Given :

Unknown :

Δm = ?

Solution :

Learn more

Rutherford’s major achievements : brainly.com/question/1552732

Unit of radius of an atom : brainly.com/question/1968819

Fusion : brainly.com/question/11395223

Answer details

Grade: College

Subject: Physics

Chapter: Nuclear Physics

Keywords: Mass , Defect , Nucleon , Number , Atomic , Proton , Electron , Neutron

4 0
3 years ago
What type of elements for ionic bonds with one another ?
steposvetlana [31]

Answer:

metals and nonmetal ions

Explanation:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

5 0
3 years ago
The equation below represents the combination of gaseous atoms of non-metal X and of hydrogen to form gaseous X2He6 molecules. 2
vichka [17]

Answer:

D +405.0kJ mol-¹

Explanation:

Since bond energy is the energy required to break a bond, the energy of dissociation of X₂H₆ = +2775 kJmol⁻¹.

Since there is one X-X bond and six X-H bonds,

Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆.

Since bond energy of one X-H bond = 395 kJ mol⁻¹, then

Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆

Bond energy of one X-X bond + 6 × one X-H bond = +2775 kJmol⁻¹.

Bond energy of one X-X bond + 6 × 395 kJ mol⁻¹ = +2775 kJmol⁻¹.

Bond energy of one X-X bond + 2370 kJ mol⁻¹ = 2775 kJmol⁻¹

Bond energy of one X-X bond = 2775 kJmol⁻¹ - 2370 kJ mol⁻¹

Bond energy of one X-X bond = +405 kJmol⁻¹

6 0
3 years ago
Please help!!! <br><br> Tysm!! Xxxx
KiRa [710]

1) The amount of PbS produced will be 16.27 grams

2: The amount of Fe produced will be 118.72 grams.

<h3>Stoichiometric problems</h3>

1) The equation is balanced. The mole ratio of lead (II) acetate to the PbS is 1:1.

Mole of 22.11 lead acetate = 22.11/ 325.29 = 0.06797 moles

Equivalent mole of PbS = 0.06797 moles

Mass of PbS = 0.06797 x 239.3 = 16.27 grams

2) from the equation, the mole ratio of Al to Fe is 1:1.

Mole of 57.2 g Al = 57.2/26.98 = 2.12 moles

Equivalent mole of Fe = 2.12 moles

Mass of Fe = 2.12 x 56 = 118.72 grams.

More on stoichiometric problems can be found here: brainly.com/question/14465605

#SPJ1

3 0
3 years ago
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