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3 years ago

What is a substance combination of different atoms?

2 answers:

5 0

Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds

anastassius [24]3 years ago

3 0

Answer:

Brainliest-

Explanation:

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The answers please to this

Vlad1618 [11]

I know for number 4 the answer is c, sorry I can't help with the others.

5 0

2 years ago

In the article, Invasion of the Periodical Cicadas, why do scienctists believe that cicadas only reproduce every 13 or 17 years?

frez [133]

Hi, you've asked an incomplete question. However, I assumed you are referring to the article found on the Scientific American website.

Explanation:

Remember, according to that article we are told that scientists notice that these insects have a long nymphal (immature form before becoming adults) stage, one that can last up to 13 to 17 years on the ground before they leave the ground looking for mating partners.

Because it is only after mating occurs at this point that their eggs are laid, that is why scientists believe that cicadas only reproduce every 13 or 17 years.

8 0

2 years ago

What is the symbol for temperature? m q T J

Tcecarenko [31]

Answer:

Explanation:

m is mass

q is heat

J is energy

6 0

1 year ago

A student uses a sample of KOH stock solution and dilutes it to a total of 120 mL. If the diluted solution is 0.60 M KOH and its

Vesnalui [34]

Answer:

5.5

Explanation:

i think so?????????

5 0

2 years ago

When lithium nitride, Li3N(s) , is treated with water, H2O(l) , ammonia, NH3(g) , is produced. Predict the formula of the gas pr

Ronch [10]

Answer: The gas produced when sodium phosphide reacts with water is phosphine.

Explanation:

When sodium phosphide reacts with water molecule, it leads to the production of flammable, poisonous gas known as phosphine along with the production of sodium hydroxide.

The chemical reaction for the reaction of sodium phosphide with water follows the equation:

$Na_3P(aq.)+3H_2O(l)\rightarrow PH_3(g)+3NaOH(aq.)$

By Stoichiometry of the reaction:

1 mole of sodium phosphide reacts with 3 moles of water to produce 1 mole of phosphine gas and 3 moles of sodium hydroxide.

Hence, the gas produced when sodium phosphide reacts with water is phosphine.

7 0

3 years ago