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4 years ago

What sample is a pure substance?A. a test tube of zinc oxide.

2 answers:

7 0

The correct answer is A. A test tube of zinc oxide. Zinc oxide is a compound which is a pure substance composed of two or more elements. They can only be separated or broken down into its individual elements or smaller compounds by chemical means. Therefore, the answer is a test tube of zinc oxide.

maks197457 [2]4 years ago

4 0

A is correct i just took the quiz

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What is the compound of sodium and chloride?

Elena L [17]

Answer:

Explanation:

Sodium chloride /ˌsoʊdiəm ˈklɔːraɪd/, commonly known as salt (although sea salt also contains other chemical salts), is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.

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3 years ago

Read 2 more answers

a patient needs 2.0 grams of medication every 6 hours. The medication is given in tablets. Each tablet contains 250mg of medicat

IgorC [24]

Answer:

$\large \boxed{32}$

Explanation:

$\text{Dosage rate} = \dfrac{\text{2.0 g}}{\text{6 h}}$

We must convert this measurement to units of "tablets per day".

1. Convert grams to milligrams

$\text{Mass} = \text{2.0 g} \times \dfrac{\text{1000 mg}}{\text{1 g}} = \text{2000 mg}$

2. Convert milligrams to tablets

$\text{No. of tablets} = \text{2000 mg} \times \dfrac{\text{1 tablet}}{\text{250 mg}} = \text{8.0 tablets}$

3. Convert hours to days

$\text{Time} = \text{6 h} \times \dfrac{\text{1 da}}{\text{24 h}} = \text{ 0.25 da}$

4. Calculate the tablets per day

$\dfrac{\text{2.0 g}}{\text{6 h}} = \dfrac{\text{8.0 tablets}}{\text{0.25 da}} = \textbf{32 tablets per day}\\\\\text{The patient must take $\large \boxed{\textbf{32 tablets per day}}$}$

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3 years ago

1- Which of the following has one double covalent bond?

Zielflug [23.3K]

Answer:

C2H6

Explanation:

Carbon forms bonds with itself, this property is called catenation and Carbon also has a tendency to form multiple bonds, double or triple. ... For C2H6, carbon forms double bond with the other carbon, and each carbon has three hydrogen atoms attached to it.

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3 years ago

The shape of the illuminated portion of the Moon as seen by an observer, usually on Earth:

Gekata [30.6K]

Answer:moon phases

Explanation:

Moon phases because the moon phases changers every day

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3 years ago

Explain what is "Heredity".

ozzi

Heredity refers to the passing of traits from parents to their offspring (either by asexual or sexual reproduction).

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3 years ago