3 years ago

How do chemists use systems and order in their work?

1 answer:

3 0

Answer:

5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .

Explanation:

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Are Si valence electrons shared? <br><br> Are C valence electrons shared?

MariettaO [177]

Answer:

Explanation:

Si has atomic number 14 so the electronic configuration 2,8,4

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3 years ago

For the reaction shown, calculate how many moles of NO2 form when each amount of reactant completely reacts.

Anton [14]

Answer:- 2.4 mol $NO_2$ .

Solution:- It asks to calculate the moles of $NO_2$ formed when 1.2 moles of $N_2O_5$ are reacted.

There is 2:4 mol ratio between $N_2O_5$ and $NO_2$ . So, the moles of reactant are multiplied by the mol ratio to get the moles of $NO_2$ . The calculations are shown below:

$1.2mol N_2O_5(\frac{4mol NO_2}{2mol N_2O_5})$

= 2.4 mol $NO_2$

So, 2.4 moles of $NO_2$ are formed when 1.2 moles of $N_2O_5$ were reacted.

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3 years ago

Read 2 more answers

Consider the reaction cacn2 + 3 h2o → caco3 + 2 nh3 . how much caco3 is produced if 47.5 moles nh3 are produced? 1. 0.950 g 2. 9

zhannawk [14.2K]

The CaCO3 produced if 47.5 moles of NH3 produced is calculated as follows

CaCN2 +3H2O = CaCO3 + 2NH3

by use of mole ratio between CaCO3 to NH3 which is 1:2 the moles of CaCO3 is therefore = 47.5 /2= 23.75 moles

mass of CaCO3 is therefore = moles x molar mass
= 23.75 moles x 100g/mol= 2375 grams which is approximate 2380 grams(answer 6)

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4 years ago

Question 19 of 25

Scrat [10]

Answer: the gas molecules interact with one another

Explanation:

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2 years ago

What is 155.4g÷8.70mL, rounded to the correct number of significant figures

OLEGan [10]

Answer:

17.9g/ml

Explanation:

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3 years ago