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Answer: PLease see answer in explanation column

Explanation:

FIRST STEP

We  find the grams ( mass ) of solute required to prepare the solution by using  the formula

grams ( mass ) of solute, g(CaCl2)= Molar mass x Molarity of the solution x Volume of the solution

Therefore Preparing 750 mL of 1.5 M calcium chloride solution, we have that Molar mass of Calcium chloride =110.98 g/mol

g(CaCl2) =110.98 g/mol X 1.5mol/L X 0.75L

g(CaCl2) =124.8525g CaCl2

SECOND STEP

Now Dissolve 124.8525g CaCl2 in about 350ml of distilled water then add more water until the final volume be comes 750ml

Answer:

Oxidation state] is defined as the charge an atom might be imagined to have when electrons are counted according to an agreed-upon set of rules:

The oxidation state of a free element (uncombined element) is zero for a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion.

Hydrogen has an oxidation state of 1 and oxygen has an oxidation state of −2 when they are present in most compounds. (Exceptions to this are that hydrogen has an oxidation state of −1 in hydrides of active metals, e.g. LiH, and oxygen has an oxidation state of −1 in peroxides, e.g. H2O2 the algebraic sum of oxidation states of all atoms in a neutral molecule must be zero, while in ions the algebraic sum of the oxidation states of the constituent atoms must be equal to the charge on the ion.

The same is written in my textbook. But how am I supposed to find the ox. number of an atom, which is in compound like K2UO4?

The nature of the indicated covalent bond in water molecule is polar.

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

The atoms that make up the molecule of water causes the water molecule to be polar because of its shape.

Thus, the nature of the indicated covalent bond in water molecule is polar.

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Answer:

The anomalous expansion of water refers to the fact that water, unlike most substances, expands when it freezes. The density of water increases as temperature decreases, but reaches a maximum at 4 degrees C then begins to expand. The significance of this is that ice is less dense than water so it floats in water.

This is of major biological importance. Lakes, ponds and streams freeze from the top down instead of from the bottom.

Answer:

Explanation:

1 mol of Aluminum = 26.98 grams

550 mol of Aluminum = x

1 * x = 550 * 26.98

x = 14839 grams

Answer:

https://www.getriddles.com/science-riddles/

Explanation:

go to this link, you will find some answers

hope it helps!

Explanation:

—COOH and —NH₂

Carboxylic Acid and Amino

Answer:

0.96 J/g °C

General Formulas and Concepts:

Thermochemistry

Specific Heat Formula: q = mcΔT

Explanation:

Step 1: Define

[Given] m = 5.0 g

[Given] ΔT = 22.0 °C - 20.0 °C = 2.0 °C

[Given] q = 9.6 J

[Solve] c

Step 2: Solve for c

Most of the matter making up earth is composed of compounds. I think

Answer:

weathering and erosion

Explanation:

Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.

Answer:

weathering and erosion

Answer:

5.47 B.M

Explanation:

✓We were given electronic configuration of argon as [Ar] 3d5.

✓This is a divalent ion. It has atomic number of 25.

✓magnetic moment can be calculated using below expresion

√[n(n+2)] .....................eqn(1)

✓ It has 5 unpaired electrons. Then n= 5

✓ [n(n+2)]

✓ substitute the ( n= 5) into eqn(1)

Then magnetic moment= [n(n+2)]

= [ 5(5+2) ]

= 5.47BM

Answer:

30.26 grams of N₂O₃

Explanation:

Divide by Avogadro's number. This leaves you with the number of moles. Then, multiply by the molar mass of N₂O₃

Answer:

The number of atoms of each kind is indicated by a subscript following the atom. If there is only one atom, no number is written. If there is more than one atom of a specific kind, the number is written as a subscript following the atom.

Answer:

DDDDD

Explanation:

According to the indicator theory, the hydrogen ion concentration for this solution is 1 × 10⁻⁸ M.

Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.

These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:

1) natural indicators

2) synthetic indicators

3) olfactory indicators.

These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.

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Answer: 6.75 moles of [tex]Na_2O[/tex] can be produced from 13.5 moles Na

Explanation:

The balanced chemical equation  for formation of [tex]Na_2O[/tex] from Na is:

[tex]4Na+O_2\rightarrow 2Na_2O[/tex]  

According to stoichiometry :

4 moles of Na give = 2 moles of [tex]Na_2O[/tex]

Thus 13.5 moles of [tex]Na[/tex] give =[tex]\frac{2}{4}\times 13.5=6.75moles[/tex]  of [tex]Na_2O[/tex]  

Thus 6.75 moles of [tex]Na_2O[/tex] can be produced from 13.5 moles Na

Answer:

Bonds are polar when one element in a compound is more electronegative than the other. This creates a dipole in the molecule where one end of the molecule is partially positive and one end is partially negative

Explanation:

Answer:

the addition of sodium chloride to water effect a lowering of the melting point of water such that the liquid cream or water mixture tends to solidify upon churning when in thermal contact with the mix indigrents

Answer:

The difference is due to the fact that one water molecule has two hydrogen atoms to one oxygen atom, as explained above. This means it takes two water molecules (2 H2O) to make one oxygen molecule (O2)

Explanation:

Answer:

In H20 does the 2 apply to Hydrogen

Explanation:

In H₂O there is two atoms of hydrogen and 1 atom of Oxygen

Hence, In H20 does the 2 apply to Hydrogen

-TheUnknownScientist

Answer:

5. radiative zone 6. 27 million degrees Farenheit 7. photosphere 8. approximately 25 million degrees Farenheit if using the calculation for the core temperature of the sun at 27 million degrees as the corona is 2 million degrees

Explanation:

Answer:

yes it can because heat can solidify the rubber and it does matter what light

Explanation:

The light can cause the rubber to become solid. It doesn't matter the type of light.

Any type of light can cause the rubber to become solid because all types of

light emit thermal(heat) radiation.  When they are emitted , it causes the

vaporization of some compounds thereby causing it to solidify.

In this scenario, the rubber being able to absorb ultraviolet light simply

depicts that it will solidify as a result of an increase in temperature due to

the thermal radiation.

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Answer:

D The atom gains an electron in an oxidation-reduction reaction.

Answer:

The dating of rocks is important because:

Explanation:

its important  to know how the rocks have changed.

Answer:

C₄H₆

Explanation:

A hydrocarbon is a molecule that only contains atoms of Carbon and Hydrogen. As you remember, the molar mass of Carbon is 12g/mol and the molar mass of Hydrogen is 1g/mol.

To solve this question we can find the amount of Carbons necessary that doesn't exceed the 54g/mol. That is:

54g/mol / 12g/mol = 4.5

As the molecular formula must be given in whole numbers, the amount of Carbons is 4. This 4 carbons have a mass of:

12g/mol*4 = 48g/mol

And the hydrogens necessaries to suply the molecular mass are:

54 - 48 = 6 hydrogens

That means molecular formula is:

Answer:

The volume required is 2.24L

Explanation:

The slaked lime Ca(OH)2, reacts with chlorine, Cl2, as follows:

6Cl₂(g) + 3Ca(OH)₂(s) → Ca(ClO₃)₂ (aq) + 2CaCl₂ (aq) + 6HCl (aq)

Where 6 moles of chlorine react with 3 moles of slaked llime,

To solve this question we must find the moles of slaked lime added. With these moles we can find the moles of chlorine required and its volume at STP as follows:

Moles Ca(OH)2 - Molar mass: 74.093g/mol-

3.70g * (1mol / 74.093g) = 0.0500 moles Ca(OH)2

Moles Cl₂:

0.0500 moles Ca(OH)2 * (6 mol Cl₂ / 3 mol Ca(OH)2) =

0.100 moles Cl₂

Now using PV = nRT

nRT / P = V

Where n are moles: 0.100 moles

R is gas constant = 0.082atmL/molK

T is absolute temperature = 273K at STP

P is pressure = 1atm at STP

And V is volume, our incognite:

0.100mol*0.082atmL/molK*273K / 1atm = V

2.24L = Volume of Cl₂

Answer:

b) velocity.

c) velocity, m/s²

d)change in velocity, change in direction, change in both velocity and direction.

e) increasing or decreasing

Answer:

An earthquake

Explanation:

Answer: The percent by mass concentration is 33.3 %

Explanation:

Mass percent is the ratio of mass of solute to the mass of solution in terms of percentage.

mass of solute = 50 g

mass of solution = [tex]{\text {density of solution}}\times {\text {volume of solution}}=1.5g/ml\times 1000ml=1500g[/tex]

Mass percentage = [tex]\frac{50g}{1500g}\times 100\%=33.3\%[/tex]

Thus percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it is 33.3 %

Answers:

1. Carbon is to organic as silicon is to inorganic

2. Sugar is to carbohydrate as oil is to lipid