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DENIUS [597]
3 years ago
11

How does the periodic table help in predicting the formula of a stable ionic compound?

Chemistry
2 answers:
sukhopar [10]3 years ago
7 0

Answer:

b

Explanation:

marshall27 [118]3 years ago
3 0
A. This is a FALSE statement because Metals in Group 1 form cations with a +1 charge and not -1. 

B. This is a TRUE statement. 

C. This is a FALSE statement because metals do not form anions i.e. negatively charged ions but form cations i.e. positively charged ions. 

D. This is a FALSE statement because metals do not form anions i.e. negatively charged ions but form cations i.e. positively charged ions. 
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Given the following reaction:
Semenov [28]

Answer:

The answer to your question is 0.35 moles of ZnCl₂

Explanation:

Data

moles of ZnCl₂ = ?

mass of Zn = 23 g

mass of CuCl₂ = excess

Balanced chemical reaction

             Zn + CuCl₂   ⇒   ZnCl₂  +  Cu

Process

1.- Convert the mass of Zn to moles

-Look for the atomic mass of Zn

Atomic mass = 65.4 g

-Convert the grams to moles

            65.4 g -------------- 1 mol

             23 g  ----------------  x

               x = (23 x 1)/65.4

               x = 23 / 65.4

               x = 0.35 moles of Zn

2.- Calculate the moles of ZnCl₂ using proportions and cross multiplication, and the coefficients of the balanced chemical reaction.

              1 mol of Zn ---------------- 1 mol of ZnCl₂

             0.35 moles of Zn --------  x

              x = (0.35 x 1) / 1

              x = 0.35 moles of ZnCl₂

7 0
3 years ago
Alpha helices are a type of secondary structure in proteins. What is the length of a 33.0 kDa single‑stranded α‑helical protein
WARRIOR [948]

Answer:

450 Å

Explanation:

The amino acids in an α-helix are arranged in a right-handed helical structure where each amino acid residue corresponds to a 100° turn in the helix, and a translation of 1.5 Å (0.15 nm) along the helical axis

Mass of protein= 33.0 kDa

33.0 kDa ×(1000Da/kDa) × ( 1 residue/ 110 Da)

=33.0 ×1000 × 0.0091

= 300 residues

300 residues × (1.5Å /residue)

=450 Å

7 0
3 years ago
Coal is burned in the atmosphere to release energy. Which gas is needed for burning to take place?
irga5000 [103]

Answer:

Oxygen gas is needed for burning to take place.

Explanation:

I don't say you have to mark my ans as brainliest but if it has really helped you plz don't forget to thank me...

3 0
2 years ago
The following situations are presented to a medical examiner. In which situation is the medical examiner most likely to gather m
kolezko [41]
B) 25-year-old male recovered from rapids after his empty kayak is sited by friends 
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8 0
2 years ago
List the following types of electromagnetic radiation in order of increasing wavelength.
chubhunter [2.5K]

Answer:

Radio, Microwave, Infared, Ultraviolet

Explanation:

look at the EM spectrum

3 0
3 years ago
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