CHEMISTRY HIGH SCHOOL

How many elements are in a compound that has a formula NiCI2+6H2O?

Answers

Answer 1
Answer: They are four elements.

Related Questions

HELP ME with THIS I am time i have a little bit of time and still have more questions !!! CHEMISTRY!!
the number of electrons in the outer ring of the elements phosphorus, potassium, oxygen, iodine, gold, bromine, sulfur, and cobalt?
Which of the following atoms would be most likely to become a cation?a) copperb) oxygenc) fluorined) nitrogen
Which of the following is one way to prevent the corrosion of iron? A. Paint exposed iron p21 with protective paint. B. Protect the iron from polluted air. C. Add carbon to the iron. D. Let the iron develop a natural coat of carbonate.
Open-ended Which amino acid would be capable of forming hydrogen bonds with a lysine residue in a protein?

The atomic theory has been revised many times over the last several hundred years. John Dalton described the atom as a solid sphere while later scientists such as J.J. Thomson and Ernest Rutherford developed different models of the atom. Why has the atomic theory changed so much over the last several centuries?
A new scientific method helps scientists form more efficient theories and models.
As new discoveries are made, existing theories are revised or replaced.
The atom has changed over time, and new theories must reflect those changes.
Scientists with different opinions

Answers

The answer is: As new discoveries are made, existing theories are revised or replaced.

Dalton stated that atom is matter that can not be divided.

His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge.  

J. J. Thomson discovered the electron in 1897.  

According to Rutherford model of the atom:  

1) Atoms have their charge concentrated in a very small nucleus.  

2) Major space in an atom is empty.  

3) Atoms nucleus is surrounded by negatively charged particles called electrons.  

4) An atom is electrically neutral.
As new discoveries are made, existing theories are revised or replaced.

Decomposition of potassium chlorate (KClO3) produces potassium chloride (KCl) and pure oxygen (O2). The balanced equation for the reaction is as follows.mc017-1.jpg
What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)
0.914 L
1.83 L
2.74 L
3.66 L

Answers

1.    The balanced reaction would be:

2KClO3 --> 2KCl + 3O2


We are given the amount of potassium chlorate for the reaction. This will be the starting point of our calculation. 

10.0 g KClO3 ( 1 mol KClO3 / 122.55 g KClO3) (3 mol O2 / 2 mol KClO3) = 0.1224 mol O2

V = nRT/P =0.1224 mol O2 x 273 K x 0.08206 atm L/mol K / 1 atm
V=2.74 L

Answer:

third option 2.74L

What two things determine whether a molecule is polar?Check all that apply. A.The size of the atoms that make up the molecule B.Whether or not there are bonds of two atoms of unequal electronegativity C.Whether there is a double bond D.The shape of the molecule

Answers

its B and C 
if ur looking for 2 options 

Answer:B & D

Explanation:

Which best describes the effect of J. J. Thomson’s discovery

Answers

Well one effect of J. J. Thomson's discovery is that he actually got a Nobel Prize. I don't really know what your choices are, so it's kinda difficult to know what you need.

43 A sample of helium gas is in a sealed, rigid container. What occurs as the temperature of the sample is increased?(1) The mass of the sample decreases.(2) The number of moles of gas increases.
(3) The volume of each atom decreases.
(4) The frequency of collisions between atoms increases.

Answers

Answer is: (4) The frequency of collisions between atoms increases.

The average kinetic energy of molecules depends on the temperature.

As temperature increases, molecules gain more energy from surrounding and move faster and have more collisions.

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.

Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:  

V₁/T₁ = V₂/T₂.  

When temperature goes up, the volume also goes up.
The best answer is (4) The frequency of collisions between atoms increases, for we are providing the atoms with energy.
Hope this helps~

Did Pb2+ react with KI? Yes or No? State the reason of your answer.

Answers

Yes, Pb2+ react with KI.

Pb2+ is lead (II) ion
KI is a compound. It is a combination of potassium (K) and iodine (I). It is called potassium iodide.

Both potassium and iodine are highly reactive elements. Thus, when they are combined with another element like Pb2+, Pb2+ reacts with KI

Answer: Yes, lead ion will react with potassium iodide.

Explanation: When lead ion reacts with KI, a bright yellow colored precipitate is formed.

The reaction of these two follows:

Pb^(2+)(aq.)+2KI(aq.)\rightarrow PbI_2(s)+2K^+(aq.)

Hence, Pb^(2+) ion reacts with KI to yield PbI_2

This test is the confirmatory test for lead ion which is present in Group I.
Other Questions
Calculate ℰ° values for the galvanic cells described below. (a) cr3+(aq) + cl2(g) equilibrium reaction arrow cr2o72-(aq) + cl -(aq) v (b) io3-(aq) + fe2+(aq) equilibrium reaction arrow fe3+(aq) + i2(aq)
If 10 milliliters of liquid has a mass of 70 grams, what is its density?O 7 g/mL70 g/mL0.7 g/mL700 g/mL
On the pH scale, a 7 indicates _____. a basean acidneutrality
What is the molar mass of a substance