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3 years ago

What happens to the mass of substances during a chemical change?

Chemistry

2 answers:

Arlecino [84]3 years ago

8 0

Answer:

when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants. The atoms from the reactants come apart, rearrange and re-bond in a different arrangement to form the products.

Explanation:

please mark branilist

Setler [38]3 years ago

6 0

no particles are created or destroyed: the atoms are simply rearranged from the reactants to the products. The products may have different properties to the reactants. Mass is never lost or gained in chemical reactions. We say that mass is always conserved.

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The maximum energy of photo electrons (increases or decreases or remains constant) with increasing frequency and (increases or d

morpeh [17]

Answer:

Increases, remain constant

Explanation:

In the light spectrum, the photons with a higher frequency (hence smaller wavelengths) have higher energy. The lower the energy the lower the frequency and longer the wavelengths. The intensity of light does not change the energy levels of these photons. The higher the intensity the higher the density of the photoelectrons.

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3 years ago

How is helium different from other noble gases?

Slav-nsk [51]

Helium only possesses two valence electrons, while the other noble gasses posses eight

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3 years ago

If oxygen with an electronegativity of 3.5 were to make a chemical bond with lithium, electronegativity of 1.0, what kind of bon

sergejj [24]

Answer:

Ionic.

Explanation:

Elements with higher electronegativity values are better at attracting electrons in a chemical bond.

A chemical bond is considered "ionic" if the electronegativity difference between the two bonding atoms is greater than $1.8$ .
Otherwise, this chemical bond is considered "covalent".

In this example, the difference between the electronegativity of oxygen and lithium is $3.5 - 1.0 = 2.5$ . Since $2.5 > 1.8$ , the bond between the two elements would likely be ionic.

It is possible to reach the same conclusion based on the fact that lithium is a metal while oxygen is a nonmetal. When metal elements react with non-metal elements, the product is typically an ionic compound- with ionic bonds between the atoms.

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2 years ago

A chemical bond is classified as a covalent bond if it involves the transfer of electrons.

alekssr [168]

I think it's A. True Hoped I helped you out

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4 years ago

Perform the following operation

lukranit [14]

Answer:

(5.4 x 10³) x (1.2 x 10⁷) = 6.48 x 10¹⁰

With correct significant figures, the answer would be 6.5 x 10¹⁰.

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2 years ago