naming compounds

does anyone know the answers for these or at least one of them ?​

Answer:

17.53 g

Explanation:

The chemical formula of nickel (II) iodide is NiI₂. Its molar mass (MM) can be calculated from the molar mass of its chemical elements:

MM(NiI₂) = 58.7 g/mol + (2 x 126.9 g/mol)= 312.5 g/mol

Given the following data:

M = 0.187 M = 0.187 mol/L

V= 300 mL = 0.3 L

We calculate the mass of NiI₂ as the product of the molarity of the solution (M), the molar mass (MM) and the volume:

mass = M x MM x V = (312.5 g/mol) x (0.187 mol/L) x 0.3 L = 17.53 g

Therefore, we have to add 17.53 grams of solid nickel(II) iodideto prepare the solution.

Answer:

q = - 2250 Joules

Explanation:

work, w = 631 joules

internal energy ΔU = -2881 joules

q = ?

The relationship between work, internal energy and q is given by the equation;

q + w =  ΔU

Since work is done by the automobile energy, it would have a negative sign, hence;

ΔU = q - w

Inserting the values and solving for q;

ΔU + w = q

q =  -2881 + 631

q = - 2250 Joules

Answer:

D

Explanation:

Answer:

Q1. Rain dissolves carbon dioxide from air to form carbonic acid. Other gases produced by industry causes rain to be more acidic. These gases are sulphur dioxide and nitrogen dioxide. When they dissolve in water, they form sulfuric acid and nitric acid. Burning fossil fuels such as coal and oil give off these gases causing acid rain. Acid rain damages plants and buildings. It also pollutes water killing fish.

Q2(b). Phenolphthalein will be:

(i) colorless in acid.

(ii) pink in alkaline.

Q3(a). Colour of pH scale:

1-2 - red

3-6 - orange or yellow

7- green

8-11 - blue

12-14 - violet or indigo

Q3(b).

1-2 - strong acid

3-6 - weak acid

7- neutral

8-11 - weak alkali

11-14 - strong alkali

1a. How acid rain alter pH of soil:

When acid rain falls on soil, it leaches the existing soil nutrients from the soil. This leads to the soil acidification; thereby making soil more acidic. As the pH of the soil becomes more acidic, the number of micro-organisms in the decreases.

1b. Vegetables that prefer acidic conditions:

1. carrots

2. potatoes

1c. Vegetables that tolerate alkaline conditions:

1. Onions

2. beans

1d. Vegetables that can tolerate the widest pH range:

1. onions

2. potatoes

1e. Vegetables that grow in neutral soil:

About 3 vegetables

Explanation:

Further depletion by acid rain leads to reduction in available plant life and micro-organisms.

Phenolphthalein is known to be naturally colorless. This indicator turns pink in alkaline solutions. It actually remains colorless throughout the range of acidic pH levels.

Answer:

When acid rain falls on soil, it leaches the existing soil nutrients from the soil. This leads to the soil acidification; thereby making soil more acidic. As the pH of the soil becomes more acidic, the number of micro-organisms in the decreases.

Explanation:

Answer:

B.

Explanation:

Answer:

4.03 × 10²³ molecules

Explanation:

Given data:

Mass of CH₄O = 22.0 g

Number of molecules = ?

Solution:

Number of moles of CH₄O:

Number of moles = mass/molar mass

Number of moles = 22.0 g/ 33 g/mol

Number of moles = 0.67 mol

Number of molecules:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.67 mol  × 6.022 × 10²³ molecules  / 1 mol

4.03 × 10²³ molecules

Answer:

Na2SO4

Explanation:

In the crisscross method, we can write the correct formula for an ionic compound by crossing over the numerical value of each of the ion charges to now serve as the subscript of the oppositely charged ion. Subsequently, the signs of the charges are dropped and the correct formula of the ionic substance is obtained.

For sodium sulphate;

Na ^+        SO4^2-

By crisscrossing and dropping the signs to obtain the subscripts we now have;

Na2SO4

Answer:

285.185 (.185 repeating) cm^3

Explanation:

To get the answer, you divide 140 by 27 to get 5.185 (.185 repeating). Then, you multiply 5.185 (.185 repeating) by 55 and get 285.185 (.185 repeating) cm^3. Please use ^ next time to indicate exponents.

The change in internal energy = 2.701 x 10² kJ

Given

Heat absorbed by system = 1.69 x 10² kJ

Work done on system = 1.011 x 10² kJ

Required

The change in Internal energy

Solution

We can use the first law of Thermodynamics :

[tex]\tt \Delta U=Q+W[/tex]

The sign rules for heat and work are set as follows:  

• The system receives heat, Q +  

• The system releases heat, Q -  

• The system does work, W -  

• the system accepts work, W +  

Heat absorbed/receive heat from surrounding = Q+

Work done on the system = W+

and input the given values

[tex]\tt \Delta U= 1.69\times 10^2+1.011\times 10^2\\\\\Delta U=\boxed{\bold{2.701\times 10^2~kJ}}[/tex]

Answer:

B.

Explanation:

The complementary strand always has the opposite base that connects for example; the opposite of A is T.

Answer:

The correct answer is 240 atoms Na

Explanation:

According to the given scenario, the calculation of the number of sodium atoms reacted is as follows:

As we know that

The sodium reaction with [tex]O_3[/tex]

[tex]6Na + O_3 \overset{\Delta} \rightarrow} 3Na_2O \mhchem[/tex]

1 mole of [tex]O_3[/tex] reacted with the 6 moles Na attom

1 molecule [tex]O_3[/tex] [tex]\rightarrow[/tex] 6 atoms Na

40 molecule [tex]O_3 \rightarrow[/tex] 6 × 40 = 240 atoms Na

hence, the number of sodium atoms reacted is 240 atoms Na

Atoms of sodium will react completely with 40 molecules of O₃ is 240.

Stoichiometry of any chemical reaction tells about the relative amount of entities present in that reaction, before and after.

Given chemical reaction will be represent as:
6Na + O₃ → 3Na₂O

From the stoichiometry of the reaction it is clear that:

1 molecule of ozone = react with 6 atoms of sodium

So, 40 molecule of ozone = react with 40×6=240 atoms of sodium

Hence, required atoms of sodium is 240.

To know more about stoichiometry, visit the below link:
https://brainly.com/question/16060223

the answer is C: Kinetic energy would turn into Potential energy.

Answer:

SubimationImage result for The phase transition of dry ice (frozen carbon dioxide ) to gas is an example of

Sublimation

Sublimation, in physics, conversion of a substance from the solid to the gaseous state without its becoming liquid. An example is the vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and temperature relationships.

Explanation:

The phase transition of dry ice (frozen carbon dioxide ) to gas is an example of sublimation. Hence, option D is correct.

Sublimation is the transition of a substance directly from the solid phase to the gas phase without passing through the intermediate liquid phase.

Sublimation, in physics, conversion of a substance from the solid to the gaseous state without its becoming liquid. An example is a vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and temperature relationships.

Hence, option D is correct.

Learn more about Sublimation here:

https://brainly.com/question/9967928

#SPJ2

Answer:

18.57 is the relative mass

Explanation:

To find relative Atomic mass we need to multiply respective isotope percentage with its mass then add all mass× percentage and divided by 100

Solution

73×18+ 12×19 + 15×21 ÷ 100

1314+228+315÷100 = 1857÷100 = 18.57

Answer:

Your body temperature would decrease

Explanation:

Answer:

D

Explanation:

took the test and got it right

Answer:

D. exchange of energy with the surroundings

Explanation:

Got it right on edge.

Answer:

Carbon dioxide

Explanation:

Answer:

A. carbon and oxygen

Explanation:

They indicate the number of each chemical species that reacts or is formed. Methane and oxygen (oxygen is a diatomic — two-atom — element) are the reactants, while carbon dioxide and water are the products.

This is because it states, "To form," which means that it was produced from the reactants Carbon and Oxygen.

To know what the products are in a statement rather than an equation, words such as produced and formed are used.

hope this helps :)

Answer:

on the last underline, put a 2

Explanation:

leave the first two blank

CH3-CH=CH2+Br2--->CH3-CH(Br)-CH2-Br

Answer:

transverse wave

Explanation:

Answer:

9

3

1

Explanation:

The correct question can be seen in the image attached.

a) The number of orbitals in a shell is the square of the principal quantum number(n). Hence, the number of orbitals present at n=3 is 3^2 =9.

b) n=5, l=1 suggests a 5p sublevel. This sub-level has a total of three degenerate p orbitals, px, py and pz.

c) n= 5 l=3, ml=3 refers to one of the seven degenerate 5f orbitals.

Answer:

It is A

Explanation

O The pipes need to be at least six feet deep to avoid the freezing ground, and he did not need to install a furnace.

Answer:

It's A

Explanation:

Got a 100% on Edge

Answer:

The correct answer is 8.79 × 10⁻² M.

Explanation:

Based on the given information, the mass of NaI given is 4.11 grams. The molecular mass of NaI is 149.89 gram per mole. The moles of NaI can be determined by using the formula,

No. of moles of NaI = Weight of NaI/ Molecular mass

= 4.11 / 149.89

= 0.027420

The vol. of the solution given is 312 ml or 0.312 L

The molarity can be determined by using the formula,

Molarity = No. of moles/ Volume of the solution in L

= 0.027420/0.312

= 0.0879 M or 8.79 × 10⁻² M

Answer:sample 3

Explanation:because if only have one kind of substance which makes it pure

Answer:

48,000,000 i think

Explanation:

Answer:

4.06 g of Mg(OH)2

Explanation:

The equation of the reaction is;

2NaOH(aq) + MgCl2(aq) -------> Mg(OH)2(s) + 2NaCl(aq)

Number of moles of NaOH= 57/1000 * 3.40 = 0.19 moles

Number of moles of MgCl2 = 38/1000 * 1.9 = 0.07 moles

We must find the limiting reactant. This is the reactant that yields the least amount of the solid.

From the reaction equation;

2 moles of NaOH yields 1 mole of Mg(OH)2

0.19 moles of NaOH yields 0.19 * 1/2 = 0.095 moles of Mg(OH)2

Also;

1 mole of MgCl2 yields 1 mole of Mg(OH)2

0.07 moles of MgCl2 also yields 0.07 moles of Mg(OH)2

Hence MgCl2 is the limiting reactant and 0.07 moles of Mg(OH)2 is produced.

Mass of Mg(OH)2 produced = number of mole * molar mass

molar mass of Mg(OH)2 = 58 g/mol

Mass of Mg(OH)2 produced = 0.07mol * 58 g/mol = 4.06 g of Mg(OH)2

Answer:

The combining capacity or power of iron in FeCl3 is +3

Explanation:

The combining capacity or power of an atom of an element is the charge which that atom possesses when it combines with other atoms to form compounds. It is also known as valency or valence.

To determine the combining capacity of iron in FeCl3, the following steps are followed:

1. Group 7 elements have a combining capacity of -1, therefore, the combining capacity of Chlorine in FeCl3 is -1

2. The sum of oxidation numbers of a neutral compound is zero, therefore, Fe + 3 × Cl = 0

Let, the combining capacity of Iron be y.

y + (-1 × 3) = 0

y - 3 = 0

y = +3

Therefore, the combining capacity of iron in FeCl3 is +3