Which component in this mixture has the lowest density? A. glass. . B. water. . C. sawdust. . D. sand

Answers

Answer 1

Answer: I believe the correct answer from the choices listed above is option A. The component in the mixture that would have the lowest density would be glass. It would be the material that floats who has the lowest density. Hope this answers the question. Have a nice day.

Answer 2

Answer:

Answer:

I took the test. The answer is C. Sawdust.

Explanation:

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Which compound is insoluble in water?
(1) KOH (3) Na3PO4
(2) NH4Cl (4) PbSO4

Answers

Ans: 4) PbSO4

Different compounds are soluble in water to a different extent, some of them are completely insoluble in water. Solubility rules help in identifying the water soluble and insoluble compounds.

Based on the rules:

1) Salts of group IA (Li, Na, K, Rb and Cs) are soluble in water

2) Salts containing NH4+ ions are water soluble

3) All phosphates (PO4³⁻) are insoluble except those containing group IA elements and (NH4)₃PO4

4) All sulfates, SO4²⁻ salts are generally soluble with the exception of Ca2+, Sr2+, Ba2+, Hg₂²⁺, Hg2+, Pb2+ and Ag+

Therefore, among the given examples:

1) KOH contains group 1A (K) therefore soluble

2) Na3PO4 contains group IA element (Na), therefore soluble

3) NH4Cl contains NH4+ ion, therefore soluble

4) Sulfate of lead (Pb) is insoluble

The compound that is insoluble in water is:

(4) PbSO4 (Lead(II) sulfate)

What is Lead(II) sulfate

Lead(II) sulfate (PbSO4) is generally considered insoluble in water. It forms a precipitate when mixed with water, indicating low solubility. In contrast, the other compounds listed are soluble in water:

(1) KOH (Potassium hydroxide) is soluble in water and dissociates into potassium ions (K+) and hydroxide ions (OH-).

(2) NH4Cl (Ammonium chloride) is soluble in water and dissociates into ammonium ions (NH4+) and chloride ions (Cl-).

(3) Na3PO4 (Sodium phosphate) is soluble in water and dissociates into sodium ions (Na+) and phosphate ions (PO43-).

Learn more about compound at

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Given the balanced equation representing a reaction:4NH3 + 5O2 ==>4NO + 6H2O
What is the minimum number of moles of O2 that are needed to completely react with 16 moles of NH3?
(1) 16 mol (3) 64 mol
(2) 20. mol (4) 80. mol

Answers

4 NH₃ + 5 O₂ = 4 NO + 6 H₂O

4 moles NH₃ --------- 5 moles O₂
16 moles NH₃ -------- ? moles O₂

moles O₂ = 16 * 5 / 4

moles O₂ = 80 / 4

= 20 moles of O₂

Answer (2)

hope this helps!

The materials created from a chemical reaction are called

Answers

Answer: The chemical species formed in a chemical reaction are products.

Explanation:

In a chemical equation, the chemical species are called as reactants or products.

Reactants are defined as the chemical species that react in the reaction and are written on the left side of the reaction arrow.

Products are defined as the chemical species that are produced in the reaction and are written on the right side of the reaction arrow.

For Example: Formation of water from hydrogen and oxygen gases, the equation follows:

$2H_2(g)+O_2(g)\rightarrow 2H_2O(l)$

The chemical species $H_2\text{ and }O_2$ are termed as reactants and $H_2O$ is termed as products.

Hence, the chemical species formed in a chemical reaction are products.

the answer would be products

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring? 1)A solid forms, and there is a change of color. 2)A gas forms, and there is a change of color. 3)A solid forms, and light is emitted. 4)A gas forms, and light is emitted.

Answers

The right answer for the question that is being asked and shown above is that: "2)A gas forms, and there is a change of color. " During an experiment, a student observes the formation of a precipitate. a chemical reaction is likely occurring because A gas forms, and there is a change of color.

Which statement describes one characteristic of an operating electrolytic cell?(1) It produces electrical energy.
(2) It requires an external energy source.
(3) It uses radioactive nuclides.
(4) It undergoes a spontaneous redox reaction.

Answers

The answer is (2). The electrolytic cell mechanism is to convert the electrical energy to chemical energy. So it need external energy source. And there is a similar one called voltaic cell which will convert the chemical energy to electrical energy.

A material is ductile, conducts electricity, and is magnetic. The material is a _____. metal nonmetal metalloid impossible to tell

Answers

The answer is metal. Metals are substances generally considered to be good conductors of electricity. They are also considered to be ductile and malleable which means they can be bent or stretched into think wires without breaking. Lastly, some metals like iron, cobalt, and nickel are strongly magnetic.

the answer your looking for is metal

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