The only way to seperate a compound into its elements is by a

Answers

Answer 1

Answer: Al

Cu

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The "skin" of the statue of liberty is made of iron. true false

Which of the following is not a valid conversion factor? 1/100 centimeter 1mL/1cm^3 1kilometer/1000 meters 1meter/10 milimeters

Answers

1meter/10 milimeters which should be 1000 mm

1m=1000mm

International System of Units (SI Units) are organized body of measurements for physical quantity. They are set to be the norm or global norm scaling for every physical quantity which includes kilogram, meter, second, ampere, kelvin, candela and mole. These measurements then can increase or decrease by the power of ten, multiplied or divided. As said and explained, the SI is helpful in describing objects because
1. They give us the idea of how much matter is contained in that single substance or the current state the matter is in or how hot or cold. We measure and can quantify the quality of the specific matter.
2. SI Units are a global set of measurement hence, we can communicate with ease from western to eastern countries with these measurements without having problems in terms of portraying or displaying a set of physical quantities.

Answer:hello

Explanation:

Task masters

Is correct! It should be answer(4) or (D)

Consider the following 1.0 mol L–1solutions. Which one of the following lists the
solutions in decreasing order (that is, strongest to weakest) of electrolyte strength?

(a) sodium phosphate > sulfuric acid > phosphoric acid > sucrose (sugar)
(b) sucrose (sugar) > sulfuric acid > phosphoric acid > sodium phosphate
(c) sulfuric acid > sodium phosphate > phosphoric acid > sucrose (sugar)
(d) sodium phosphate > phosphoric acid > sulfuric acid > sucrose (sugar)

Answers

(a) sodium phosphate > sulfuric acid > phosphoric acid > sucrose (sugar)
(b) sucrose (sugar) > sulfuric acid > phosphoric acid > sodium phosphate
(c) sulfuric acid > sodium phosphate > phosphoric acid > sucrose (sugar)
(d) sodium phosphate > phosphoric acid > sulfuric acid > sucrose (sugar)

What is the most common salt found in ocean water?

Answers

Hello.

The answer i believe would be sodium.

Have a great day.

The purpose of an indicator is to A. test and determine the pH values of unknown solutions. B. help acids and bases dissociate when placed in water. C. make a solution more neutral. D. conduct electricity.

Answers

Answer is: A. test and determine the pH values of unknown solutions.

Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations (pH or pOH values).

Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄). Phenolphthalein is colorless in acidic solutions and pink in basic solutions.

Another example is methyl orange. It is red colour in acidic solutions and yellow colour in basic solutions.

Answer: The correct answer is option A.

Explanation:

An indicator is a substance which changes color to show any chemical change happening in the reaction. It gives the visible sign of any change.

Hence, main role of indicators from the given options is to determine the pH values of unknown solutions.

pH is the scale which shows the acidity and basicity of the solutions. It is the negative logarithmic value of hydrogen ion concentration of the solution. More the hydrogen ion concentration, less will be the pH and more acidic will be the solution.

$pH=-\log[H^+]$

The scale ranges from 0 to 14.

The value ranging from 0 to 6.9 are acidic solutions.

The value ranging from 7.1 to 14 are basic solutions.

The value having pH = 7 is neutral solution.

Indicator used to determine the pH of the solution is pH-paper which is shown in the image.

Which of the following is one way to prevent the corrosion of iron

Answers

A way to protect iron corrosion is to paint the Iron with layers of protective paint and coating.

Answer:

Explanation:

How much heat is given off when 8 g of hydrogen reacts in: 2H₂ + O₂ → 2H₂O; ΔH = -115.60 kcala. -57.8 kcal
b. -115.6 kcal
c. -173.4 kcal
d. -231.2 kcal
e. -462.4 kcal

Answers

ΔΗ= -115.6 kJ/mol
H2 has a Mr of 2, so as mol=mass/mr we can work out that there are 4 moles of H reacting

Therefore we multiply -115.6 by 4 = -462.4

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Write a nuclear equation for the fusion of two h−2 atoms to form he−3 and one neutron.