3 years ago

Which of the following statements about ions is NOT CORRECT?

Chemistry

1 answer:

madam [21]3 years ago

7 0

Answer:

B. Anions are formed when an atom loses electrons.

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If you have 30 grams of oxygen, how many atoms are present?

umka21 [38]

Answer:

1 × 10²⁴ atoms O

General Formulas and Concepts:

Chemistry - Atomic Structure

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

Explanation:

Step 1: Define

30 g O

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of O - 16.00 g/mol

Step 3: Convert

$30 \ g \ O(\frac{1 \ mol \ O}{16.00 \ g \ O} )(\frac{6.022 \cdot 10^{23} \ atoms \ O}{1 \ mol \ O} )$ = 1.12913 × 10²⁴ atoms O

Step 4: Check

We are given 1 sig fig. Follow sig fig rules and round.

1.12913 × 10²⁴ atoms O ≈ 1 × 10²⁴ atoms O

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3 years ago

When calcium carbide (CaC2) comes into contact with water, it produces ethyne (C2H2) according to this equation: CaC2(s) + 2H2O(

SOVA2 [1]

Answer:

1.21

Explanation:

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4 years ago

Which element is located in period 4?

Lena [83]

Answer:

i beleive iron

Explanation:

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3 years ago

Which of the following is not a heterogeneous mixture? A.Concrete B.Pizza C.Sugar Water D.Chicken Soup

Arisa [49]

The answer is C. sugar water. Sugar can dissolve in water completely and form the solution. While other three are all heterogeneous mixture.

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3 years ago

Urea is an organic compound widely used as a fertilizer. Its solubility in water allows it to be made into aqueous fertilizer so

skad [1K]

Answer:

3 hydrogen bonds.

Explanation:

This is because the urea molecule has an oxygen atom bound with double bonds to the central carbon atom, and this oxygen can form a hydrogen bond with water, as well as both terminal amine groups that can also form a hydrogen bond each because of the lone pair of electrons on the nitrogen group.

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3 years ago