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Neporo4naja [7]
3 years ago
9

Based on the periodic table why are be, bg, ca and sr in the same column/group/family?

Chemistry
1 answer:
Lesechka [4]3 years ago
7 0

Answer:

The elements are in the same column/group IIA.

See the explanation below, please.

Explanation:

The elements Calcium, Strontium, Beryllium, Magnesium, Barium and Radio, belong to the group of alkaline earth metals located in group IIA of the periodic table, they require 2 electrons to complete their octet (they have 2 valence electrons). reagents than alkali metals.

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What is the molar mass of sodium carbonate (Na2CO3)?
madreJ [45]

Answer:

105.9888 g/mol

Explanation:

The molar mass of sodium carbonate is 105.9888 g/mol (grams per mole)

4 0
3 years ago
Read 2 more answers
Calculate the number of Li atoms in 7.8 mol of Li.
Gwar [14]
<h3>Answer:</h3>

4.7 × 10²⁴ atoms Li

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

7.8 mol Li

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. Set up:                              \displaystyle 7.8 \ mol \ Li(\frac{6.022 \cdot 10^{23} \ atoms \ Li}{1 \ mol \ Li})
  2. Multiply/Divide:                \displaystyle 4.69716 \cdot 10^{24} \ atoms \ Li

<u>Step 4: Check</u>

<em>We are told to round to 2 sig figs. Follow sig fig rules and round.</em>

4.69716 × 10²⁴ atoms Li ≈ 4.7 × 10²⁴ atoms Li

6 0
2 years ago
A tank of methane gas contains 2.8 m³ of the gas at 20°C. The tank has a pressure-release valve that releases gas into a seconda
IgorC [24]
There is a typo in the question. hopefully, i assumed the correct number.

when volume and temperature are given, that means you need Charles' law. remember that with any gas formula, the temperature has to be in Kelvin which can be determined by simply adding 273 to Celsius.

Charles' law---> V1/T1 = V2/T2

V1= 2.8 m3
T1= 20 C = 293 K
V2= 0.2 m3
T2= ????

let's plug in the values

2.8/ 293 = 0.2/ T2

T2= 20.9 Kelvin

to change the answer to Celsius, just subtract 273 to the temperature

20.9 - 273= -252 Celsius
5 0
3 years ago
H2CO3 -&gt; H2O + CO2 What type of chemical reaction is taking place in this
OlgaM077 [116]

Answer: decomposition

Explanation: one molecule forms tro molecules

8 0
3 years ago
Which of the following general trends are true for the atomic mass of elements in the periodic table?
Setler [38]

Answer:

D. the atomic mass increases from left to right

Explanation:

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