CHEMISTRY MIDDLE SCHOOL

A train took 18 hours to finish 1530 miles journey. What was the average speed of the train during this journey ?

Answers

Answer 1
Answer: 85 mph is the average

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HIGH SCHOOL

Which is a characteristic of the electron sea model for metallic bonding? Molecular orbitals overlap to produce bands.
Atomic nuclei are arranged in a regular pattern.
Electrons are in localized positions in the orbitals.
Atomic nuclei are arranged in an irregular pattern.

Answers

The correct one is option 2

I taking the test in edginuity and i also believe it to be the second option.
COLLEGE

Write the net ionic equation for the equilibrium that is established when ammonium perchlorate is dissolved in water.

Answers

Hydrolysis reaction of ammonium perchlorate (NH4ClO4)

NH4ClO4(aq) + H2O (l) ↔ NH4OH (aq) + HClO4(aq)

Total ionic:

NH4+(aq) + ClO4-(aq) + H2O(l) ↔ NH4OH(aq) + H+ (aq) + ClO4-(aq)

Cancelling ClO4- on both sides,

NH4+(aq) + H2O(l) ↔ NH4OH(aq) + H+ (aq)  

NH4+(aq) + H2O(l) ↔ NH3 (aq) + H2O(aq) + H+ (aq)  

Net ionic:

NH4+(aq) + H2O(l) ↔ NH3 (aq) + H3O+(aq)  

HIGH SCHOOL

Jane bought some raisins to keep in her purse as a snack what is one reason raisins dont need refrigeration

Answers

Raisins are dried up grapes. The drying process worked on preserving raisins. Most of the water contained in them was removed during the drying process. This dry environment is not suitable for bacteria to breed in and, thus, raisins won't go rancid. 

Answer: The drying process worked to preserve them

Explanation: apex

MIDDLE SCHOOL

A student says that all pure substances are elements. Do you agree? Why or why not? Question 14 options:I disagree.  Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.I disagree.  All pure substances are also mixtures.I disagree.  Elements are not pure substances.  All pure substances include only molecules and compounds, which are more complex.I agree.  Pure substances include only single atoms made of one element.

Answers

Answer: I disagree.  Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.


Explanation:


Pure substances are those that have a uniform and constant (invariable) composition.


That condition is met by both elements and compounds.


Elements are pure substances of one only kind of atoms. For example, gold, oxygen, sodium, hydrogen, are pure substances that arer elements. There are 118 elements known and they are all listed in the periodic table.


Compounds are pure substances formed by two or more different kind of atoms. Water (H₂O), table salt (NaCl), and ethanol (CH₃-CH₂OH), are examples of pure substances that are compounds. There are pratically infinite different compounds.


In conclusion, compounds are also pure substances, since every sample of a given compound has always the same kind of elements bonded in the same way.


Answer:

The answer is I disagree.  Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.

Explanation:

In chemistry a pure substance is either an element or a compound. Therefore hydrogen, oxygen, sodium, iron, copper etc all are pure substances; and same is the case with compounds such as water, sugar, ammonia, sodium chloride, methane, ethanol etc. A compound is composed of two or more elements combined in a fixed ratio by mass so we can say that some pure substances include elements bonded together to form molecules and compounds.

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