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Andrews [41]
3 years ago
7

Based on the information in the table, which elements are most likely in the same periods of the periodic table?

Chemistry
2 answers:
daser333 [38]3 years ago
3 0
The answer is A.<span>Boron and carbon are likely together in one period because they have very close atomic numbers, while gallium and germanium are likely together in another period because they have very close atomic numbers.
</span>
Stells [14]3 years ago
3 0

The element that  are most likely in the same period of periodic table is

<em> Boron  and carbon  are likely together in one period  because they  have  very close  atomic   number, while  gallium and germanium  are likely  together  in another period  because  they  have  very  close atomic  numbers ( answer A)</em>


<u>Explanation</u>

  • Element  in   same period  have the  close atomic  number .
  • The   atomic number of  an element is determined by number of protons the element have.
  • The number of proton are equal to number of electrons

Therefore   boron is in atomic number  5  with  2.3  electronic  configuration  while  carbon  is in atomic number 6 with 2.4  electron  configuration

since both  boron  and carbon  have two  energy level  they are in period 2.


Gallium  is in atomic number 31 with  2.8.8.8.5  electron configuration while Germanium (Ge)  is in atomic number 32 with  2.8.8.8.6  electron configuration.

Since  both gallium  and germanium  has 5  energy level they are in  same period (period 5)


  • for example  Aluminum,boron  and gallium are in group (iii)  since they have  3 valence electrons.
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A student obtains a beaker containing a solution that is determined to have a hydrogen ion
OleMash [197]

Answer:

pH = 13.1

Basic

Explanation:

Step 1: Given data

Hydrogen ion concentration ([H⁺]): 6.7 × 10⁻¹⁴ M

Step 2: Calculate the pH of the solution

We will use the definition of pH.

pH = -log [H⁺]

pH = -log 6.7 × 10⁻¹⁴ = 13.1

  • When pH < 7, the solution is acid.
  • When pH = 7, the solution is neutral.
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Since pH > 7, the solution is basic.

6 0
3 years ago
A compound is found to be 30.45% n and 69.55 % o by mass. if 1.63 g of this compound occupy 389 ml at 0.00°c and 775 mm hg, what
Charra [1.4K]
1) mass composition

N: 30.45%
O: 69.55%
   -----------
   100.00%

2) molar composition

Divide each element by its atomic mass

N: 30.45 / 14.00 = 2.175 mol

O: 69.55 / 16.00 = 4.346875

4) Find the smallest molar proportion

Divide both by the smaller number

N: 2.175 / 2.175 = 1

O: 4.346875 / 2.175 = 1.999 = 2

5) Empirical formula: NO2

6) mass of the empirical formula

14.00 + 2 * 16.00 = 46.00 g

7) Find the number of moles of the gas using the equation pV = nRT

=> n = pV / RT = (775/760) atm * 0.389 l / (0.0821 atm*l /K*mol * 273.15K)

=> n = 0.01769 moles

8) Find molar mass

molar mass = mass in grams / number of moles = 1.63 g / 0.01769 mol = 92.14 g / mol

9) Find how many times the mass of the empirical formula is contained in the molar mass

92.14 / 46.00 = 2.00

10) Multiply the subscripts of the empirical formula by the number found in the previous step

=> N2O4

Answer: N2O4
3 0
3 years ago
Please help! I'm confused on a few of these, 100 points!
Aliun [14]
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3 0
3 years ago
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Which of the following is true for balancing equations?
nataly862011 [7]

Answer:

D) There must be equal number of atoms of each elements on both sides of equation.

Explanation:

The balancing equation must have equal number of atoms of each elements on both sides of equation.

The balance equation shoes mass is conserved thus followed the law of conservation of mas.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

8 0
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Debora [2.8K]
One chemical change would be baking the muffin.
One physical change would be chopping the fruits to add to the mixture
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