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3 years ago

Chemical reactions will occur if

Chemistry

2 answers:

shusha [124]3 years ago

7 0

Answer:

the products are more stable than the reactants.

Explanation:

IrinaK [193]3 years ago

3 0

Chemical reactions will occur if the reactants molecules collide with each other. The kinetic energy of collision, break bonds in the reactants and if more heat energy is released when making the bonds than what was taken will break.

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Which of these statements best describes physical properties?

balu736 [363]

The correct answer would be D: Physical properties can be observed without changing the identity of a substance

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2 years ago

Which atoms were needed to form the sodium nitrite?

alex41 [277]

Answer:

Molecular Formula : NaNO2 or NNaO2 and Molecular Weight:

68.995 g/mol

Explanation:

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3 years ago

What is a metal and a non metal

Mrac [35]

Answer:

I assume you mean as in elements

A metal "A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable or ductile." (wiki)

a non-metal "In chemistry, a nonmetal is a chemical element that mostly lacks the characteristics of a metal. Physically, a nonmetal tends to have a relatively low melting point, boiling point, and density. A nonmetal is typically brittle when solid and usually has poor thermal conductivity and electrical conductivity." (wiki)

Explanation:

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3 years ago

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liubo4ka [24]

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3 years ago

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How many moles are in 2.8x10^24 atoms of silicon?

sergejj [24]

Answer:

4.6 mol Si

General Formulas and Concepts:

Atomic Structure

Reading a Periodic Table
Moles
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 2.8 × 10²⁴ atoms Si

[Solve] moles Si

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[DA] Set up: $\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})$
[DA] Divide [Cancel like units]: $\displaystyle 4.64962 \ mol \ Si$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.64962 mol Si ≈ 4.6 mol Si

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3 years ago