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3 years ago

What is the smallest unit of an element called

Chemistry

2 answers:

steposvetlana [31]3 years ago

8 0

The smallest unit of an element is called an Atom. An atom consists of protons, neutrons, and electrons.

raketka [301]3 years ago

8 0

Atom is the smallest unit of an element.  The atom is unit of matter, or its the smallest unit of an element. Hope this helps! Thank you for posting your question. Have a great day! -Charlie

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Animals use oxygen in the process of blank and emit CO2 as a byproduct.

Temka [501]

Answer:

Respiration

Explanation:

The act of breathing, simple as that!

Hope this helped!!

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2 years ago

The brightness of a star depends on its _____ a. color b. composition of atmosphere c. distance from Earth, and stars that are c

Yanka [14]

Answer:

Either B or C. Composition or the Distance from the Earth.

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2 years ago

Convert the following with the correct number of significant figures:

larisa [96]

Answer:

1.78 × 10⁹ μg

Explanation:

We have to convert 1.78 kg to μg.

Step 1: Convert 1.78 kilograms to grams

We will use the conversion factor 1 kg = 10³ g.

1.78 kg × 10³ g/1 kg = 1.78 × 10³ g

Step 2: Convert 1.78 × 10³ grams to micrograms

We will use the conversion factor 1 g = 10⁶ μg.

1.78 × 10³ g × 10⁶ μg/1 g = 1.78 × 10⁹ μg

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2 years ago

Nitrogen dioxide and water react to form nitric acid and nitrogen monoxide, like this:

posledela

Answer: The value of the equilibrium constant Kc for this reaction is 3.72

Explanation:

Equilibrium concentration of $HNO_3$ = $\frac{15.5g}{63g/mol\times 9.5L}=0.026M$

Equilibrium concentration of $NO$ = $\frac{16.6g}{30g/mol\times 9.5L}=0.058M$

Equilibrium concentration of $NO_2$ = $\frac{22.5g}{46g/mol\times 9.5L}=0.051M$

Equilibrium concentration of $H_2O$ = $\frac{189.0g}{18g/mol\times 9.5L}=1.10M$

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as $K_c$