CHEMISTRY HIGH SCHOOL

When nickel combines with fluorine to form nickel (III) fluoride, the charge of the nickel ion isa. Ni1+.
c. Ni3+.
b. Ni2+.
d. Ni4+.

Answers

Answer 1

Answer:

the answer is c because when you take a nickel and fluorine you get Ni3+

Answer 2

Answer:

Answer:

Explanation:

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After creating a Beer's Law plot using standard solutions of Q, you determined the slope of Beer's Law to be 0.543 M-1. Your unknown solution of Q tested in Part B of the experiment had an absorbance of 0.144. Determine the concentration (in molarity) of the unknown solution Q from Part B. Do not use scientific notation or units in your response. If Carmen adds zeros after the decimal place, your answer will still be graded correctly.
The unstable arrangement of atoms that forms momentarily at the peak of the activation-energy barrier is known as the what?
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What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?

What mass of chloride gas will react with 96.6g of sodium?

Answers

Molar mass :

Cl₂ = 71.0 g/mol Na = 23.0 g/mol

2 Na + Cl₂ = 2 NaCl

2 x 23 g Na -------> 71.0 g Cl₂
96.6 g Na ----------> ?

Mass Cl₂ = ( 96.6 x 71.0 ) / ( 2 x 23 )

Mass Cl₂ = 6858.6 / 46

= 149.1 g of Cl₂

hope this helps!

Which barium salts is most insoluble in water?

Answers

Barium salts are mostly insoluble and toxic.

Example : Barium chloride , barium hydroxide, barium carbonate,barium sulfate.

hope this helps!

Which formula represents copper(I) oxide?
(1) CuO (3) Cu2O
(2) CuO2 (4) Cu2O2

Answers

Answer : The correct formula of copper(I) oxide is, (3) $Cu_2O$

Explanation :

Copper(I) oxide is an ionic compound because copper element is a metal and oxide element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.

The nomenclature of ionic compounds is given by:

Positive ion is written first.
The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.

The charge on copper is (+1) and the the charge on oxide is (-2). The charges are not balanced. The charges are balanced by the criss-cross method.

Hence, the formula of copper(I) oxide is, $Cu_2O$

The answer is (3) Cu2O. Copper (I) has an oxidation state of +1 (that's what the "I" indicates). You can also think of this as copper (I) having a charge of +1. Oxygen has an oxidation state of -2 (that's just a rule you have to know), and you can think of it as oxygen having a charge of -2. You need oxidation numbers in a neutral compound to add up to 0 (or charges in a neutral compond to add up to 0), so you need two Cu to balance the O, which is Cu2O.

Plz help based on graph 1. what is happening to the population of the mice between days 0 and 7? suggest some possible reasons why this trend is occurring? 2. what is the approximate carrying capacity of this mouse population from observing the graph? how do you know this ? 3. the farmer who owns the barn has been given two barn cats how will this affect the size of the mouse population explain your answer 4. What are some other factors that will change the size of the mouse population in the future?

Answers

1. The population of the mice seemed to grow until day 7. This likely occurred do to the fact that the mice kept reproducing and they had enough resources to sustain the population growth.
2. the carrying capacity is around 24 since that is when they reach population equilibrium.
3. This will lower the mice population since it will introduce a predator that will lower the carrying capacity.
4. The mice population can change in the future if more predators are introduced, if predators die out/go away, if an invasive species is introduced that competes with the mice for resources, if the climate changes, and if the amount of resources available to the mice increases or decreases.
I hope this helps. let me know in the comments if anything was unclear.

8. Which phrase best describes an atom?(A) a positive nucleus surrounded by a ha dnegative shell(B) a positive nucleus surrounded by a cl udof negative charges(C) a hard sphere with positive particlesuniformly embedded(D) a hard sphere with negative particlesuniformly embedded

Answers

The best answer is B.... The nucleus is after all positively charged and the shells are a cloud of negatively charged particles that surround the nucleus.

An Atom is best described as a positive nucleus surrounded by a cloud of negative charges, with the nucleus containing protons and neutrons, and an outer cloud of electrons.

The phrase that best describes an atom is (B) a positive nucleus surrounded by a cloud of negative charges. An atom consists of two regions: the nucleus, which is centrally located and contains protons and neutrons which are positively charged and neutral respectively; and the electron cloud, which is made up of electrons, that are negatively charged, in constant motion around the nucleus. Therefore, we can visualize the atom as a positive nucleus surrounded by a cloud of negative charges.

Learn more about Atom structure here:

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For the chemical reaction C2H6 + 137 kJ C2H4 + H2, the chemical energy of thea. reactant is greater than the chemical energy of the products.
b. products is greater than the chemical energy of the reactant.
c. reactant and the chemical energy of the products are equal.
d. reaction is conserved.

Answers

The reaction C₂H₆+137kJ→C₂H₄+H₂ is endothermic since the energy is being absorbed by the reaction and not released. We know this by the fact that the energy is on the reactants side of the reaction. If the energy was on the products side of the reaction we would call it exothermic since energy would be being released. Since this reaction is endothermic we know that the products will have more energy than the reactants which means that the answer is B.

(the equation in the question does not have an arrow in it so I assumed it was between the 137kJ and C₂H₄).

I hope this helps. Let me know if anything is unclear.

Answer:

The chemical energy of C2H4 and H2 is greater than the chemical energy of C2H6 .

Explanation:

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