Answer 2
The chemical formula for compound zinc (II) phosphate is Zn₃(PO₄)₂.
Zinc (II) phosphate is an inorganic chemical compound that is made up of zinc cations and phosphate anions .The chemical formula for zinc (II) phosphate is obtained by combining three zinc cations with two phosphate anions to achieve the neutral charge.
Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
Thus, chemical formula for compound zinc (II) phosphate is Zn₃(PO₄)₂.
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in which of the following is the symbol for the ion and the number of electrons it contains given correctly? *
5. The compound is called:
*
(1 Point)
VP2
Vanadium (1) phosphide
Vanadium (IV) phosphide
Vanadium phosphide
Vanadium (VI) phosphide
Vanadium (V) phosphide
6. The compound is called
Question:
In a laboratory demonstration, a balloon filled with methane and oxygen was exposed to a
flame. The result was a brief, large flame. The students were asked to formulate an equation for
the reaction. One answer is below.
CH, + 0 = CO,
This equation is incorrect.
A. Explain how and why it is incorrect
B. What would the correct equation be, and how do you know that?
Which is the formula for iodine tribromide?
IBr
IB3
IBr3
I3Br
By examining the diagram, which of the following is NOT needed for photosynthesis:
O sunlight
O carbon dioxide
O water
oxygen
Which sentence best explains the relationship between pressure and the
solubility of a gas?
A. The greater the pressure, the more gas that will dissolve.
B. Solubility increases with pressure for some gases but not others.
C. The lower the pressure, the more gas that will dissolve.
D. Pressure has no effect on the solubility of gases.
All of the alkaline earth metals are similar in that – they are all artificially made elements they all have similar atomic weights. they all have the same ionic charge. they all show variable valences.
Please answer these. The tables needed for question 7 are in the picture. I got rid of some of the questions that you wouldn’t be able to answer without doing the lesson
Question 1: Electron Notation Example (2 points)
a. Give the electron configuration of vanadium (V), atomic number 23. (0.5 points)
b. Give the noble gas configuration of vanadium (V), atomic number 23. (0.5 points)
c. List the energy levels for the orbital configuration of vanadium (V), atomic number 23. (1 point)
Question 3: Trends on the Periodic Table (2 points)
a. How does the atomic radius change going down and across the periodic table? (0.5 points)
b. How does first ionization energy change going down and across the periodic table? (0.5 points)
c. How does electronegativity change going down and across the periodic table? (0.5 points)
d. How does the radius of a positive and negative ion compare to a neutral atom? (0.5 points)
Question 4: Chemical Bonds (1 point)
Match each chemical bond to its correct description. (1 point)
A. Ionic bond ___ Sharing of electrons
B. Covalent bond ___ Freely moving electrons
C. Metallic bond ___ Transfer of electrons
Question 5: Intermolecular Forces (3 points)
a. Describe the dipole-dipole force. (1 point)
b. Describe hydrogen bonding. (1 point)
c. Describe the Van der Waals forces. (1 point)
Question 6: Intermolecular Forces and You (2 points)
Imagine you need to take a medicine that the doctor has prescribed for you. Explain why scientists who developed that medicine would need to know whether or not the compound in that medicine is polar. How might a polar medicine behave differently within your body than a nonpolar medicine would? Answer in 1 to 2 paragraphs.
Question 7: Energy in Bonds (9 points)
Use these tables for reference for all parts of this question.
This table summarizes the average energies of single bonds between atom pairs in many different compounds.
a. According to Table 2, which is the strongest bond? Which is the weakest bond? Based on what you know about the atomic radii and electronegativity of the elements involved in the bonds, why do you think these two have the most extreme bond-energy values? (3 points)
b. How are the bond energies of each bond listed in Table 2 determined? (1 point)
c. Why do you think there aren't bond energy values given in Table 2 for N–S and S–I? (1 point)
d. Based on Tables 1 and 2, how would you describe the trend in bond strength of single, double, and triple bonds? (1 point)
e. Based on Table 2, how would you describe the trend in the strength of bonds formed by the elements carbon, nitrogen, and oxygen? Would you describe this trend as a periodic trend? Why or why not? (3 points)
Question 8: Causes of Molecular Shape (3 points)
a. What is the VSEPR theory? (1 point)
b. How does electron repulsion determine molecular shape? (1 point)
c. How do lone electron pairs affect molecular shape? (1 point)
Question 10: Lewis Structure (3 points)
a. Draw the Lewis structure for the Se and 2 H atoms. (1 point)
b. Draw the Lewis structure for the SeH2 molecule. (1 point)
c. What shape would SeH2 have? Draw the molecule. (1 point)
Question 11: Ionic and Covalent Compounds (5 points)
Identify each of the following as a covalent compound or ionic compound. Then provide either the formula for compounds identified by name or the name for those identified by formula. (1 point each)
a. Li2O:
b. Dinitrogen trioxide:
c. PCl3:
d. Manganese(III) oxide:
e. Calcium bromide:
where information about each element is located
The
the surface area of the reactants, the faster the reaction rate.
A. greater
B. lesser
What is the affected variable in an experiment. A:independent. B:dependent. C:control
If a metal donates or loses an electron it becomes a..
A. Ionic
B. Covalent
C. Metallic
Which best explains the difference between a monomer and a polymer?
A monomer is larger than a polymer.
A monomer contains carbon and a polymer does not.
A polymer contains carbon and a monomer does not.
A polymer is larger than a monomer.
Which model best represents a pattern?
Antenne UHF
Chaum
RTG
Master
Antenne
grand gain
DAN
REMS
RAD
SAM
Chemin
Answers
Is it grand gain? Sorry, i’m not too good at this.
What is atomic mass made of?
PLEASE HELP!!!!
7. According to Mohs Hardness scale, which of these groups of minerals can scratch fluorite? А. B. talc, calcite, and apatite calcite, quartz, and topaz apatite, orthoclase, and corundum diamond, gypsum, and quartz C.
When an ionic bond forms what type of ions are joined?
Answers
It usually becomes a positive ion, or cation.
How much work is required to pull a sled if you use 60J of work in 5 seconds?
A group of tourists were on an outing when they noticed that precipitation began to fall. The air temperature was 32 degree Fahrenheit. What type of precipitation did they most likely see?
What is the total number of electrons in an atom of an element with an atomic number of 18 and a mass number
of 40?
a. 58
c. 22
b. 18
d. 40
Does anyone know how to determine if a reaction is a redox or not?
2Ca+O2→2CaO2 is the reaction. I've already made it a balanced equation, I just need to determine if its a redox or not.
Thank you!
Hair is composed of a protein called cellulose
O
True
O False
Most of the elements on the Periodic Table are metals.
True
False
