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3241004551 [841]
3 years ago
5

In past scientist used stars and planets to determine time?

Chemistry
1 answer:
Lynna [10]3 years ago
5 0

Answer:

no

Explanation:

they used stars and planets to orientate

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Attracting electrons to form chemical bonds is called what
MAXImum [283]

Answer: Ionic bonding

7 0
3 years ago
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What does HNO3 produce when it is placed in a water solution ​
jeka57 [31]

Nitric acid does NOT react with water, water disassociates the molecules into those ions (above). ... Water,Being a polar solvent,…makes HNO3 ionise or dissociate or simply break down into Hydronium ions, i.e,H+ or H3O+ ions and nitrate NO3- ions..that's all.

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4 0
3 years ago
How does an ionic bond differ from a covalent bond?
Usimov [2.4K]

Answer:

Ionic bonds transfer electrons and covalent bonds share electrons.

Explanation:

Ionic bonds tend to transfer electrons completely. Take NaCl for example.

Cl has 7 valence electrons.

Na has 1 valence electron.

To stabilize themselves, either with a full 8 shells or full outer shell, Cl wants 1 electron and Na wants to lose 1 electron. So when NaCl forms, Na donates its electron to Cl.

In a covalent bond, the electrons are shared. Water can be used as an example. The electrons in water usually are around the oxygen, but sometimes it is around the hydrogens.

6 0
3 years ago
How many moles are in 25.0 grams of KMnO4?
Lilit [14]

Answer:- 0.158 moles

Solution:- Moles are calculated on dividing the grams by the molar mass.

25.0 grams of KMnO_4 are given and we are asked to calculate the moles.

For this we need the molar mass so let's calculate it first.

Molar mass is the sum of atomic masses of all the atoms present in the molecule.

Molar mass = 39.098+54.938+4(16)

= 158.036 gram per mol

Now, we will divide the given grams by molar mass to get the moles and the set is shown as:

25.0gKMnO_4(\frac{1mol}{158.036g})

= 0.158molKMnO_4

So, there are 0.158 moles of KMnO_4 .

3 0
3 years ago
Which of these is a renewable resource? A) Gasoline that contains some alcohol B) Wind produced by the uneven heating of Earth's
jasenka [17]

I think the answer COULD be C

3 0
3 years ago
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