Find the weight of sodium hydroxide needed to form a 1M solution of 500 mL.

Answer:

d. 1 mole Al₄C₃ and 12 moles H₂O

Explanation:

The coefficients in a balanced chemical equation indicate the number of moles of reactants and products. If a substance does not have a coefficient written in front of it, it is assumed to be 1.

The amount of substance left after n half cycle of caesium is given by -

[tex]\green{ \underline { \boxed{ \sf{N_t= \frac{N_o}{2^n}}}}}[/tex]

where

[tex]\green{ \underline { \boxed{ \sf{Number \: of \: half \:cycle = \frac{Given\:Time \: period}{Period \: of \: half \:cycle}}}}}[/tex]

[tex]\begin{gathered}\\\implies\quad \sf Number \: of \: half \:cycle = \frac{90.9}{30.3}\\\end{gathered} [/tex]

[tex]\begin{gathered}\\\implies\quad \sf Number \: of \: half \:cycle = 3 \\\end{gathered} [/tex]

Now,

[tex]\begin{gathered}\\\implies\quad \sf N_t= \frac{N_o}{2^n} \\\end{gathered} [/tex]

[tex]\begin{gathered}\\\implies\quad \sf N_t= \frac{60}{2^3} \\\end{gathered} [/tex]

[tex]\begin{gathered}\\\implies\quad \sf N_t= \frac{\cancel{60}}{\cancel{8}} \\\end{gathered} [/tex]

[tex]\begin{gathered}\\\implies\quad \sf N_t= 12.5 g \\\end{gathered} [/tex]

Therefore, 12.5 gram of cesium would be left over 90.9 years.

Answer:

The higher the temperature, the brighter the star.

Explanation:

Arrhenius :

acid: a compound that releases H⁺ ions in water

base: a compound that releases OH⁻ ions in water

H2S Arrhenius acid

RbOH Arrhenius base.

Mg(OH)2  Arrhenius base.

H3PO4 Arrhenius acid

The most common chemical is Sodium Bicarbonate used in the fire extinguisher, But today, Potassium Bicarbonate is widely used in fire extinguishers due to its effectiveness as compared to Sodium Bicarbonate.

Answer:

3 Br₂(l) +  I₂ (s) --> 2 IBr₃ (g)

Explanation:

After multiplying the coefficients and the subscripts, this would leave you with:

Reactants: 6 Br and 2 I

Products: 6 Br and 2 I

These are the lowest possible coefficients because you cannot further divide the coefficients and still get a whole number.

Answer:

13.28 moles

Explanation:

A mole is avogadro's number of atoms, or 6.022*10^23 atoms. You just have to divide the amount of atoms by avogadro's number to get the amount of moles. (8*10^24)/(6.022*10^23)=13.28 moles of neon

The major distinction between emission and absorption spectra is that an emission spectrum has various colored lines, whereas an absorption spectrum contains dark-colored lines. When electrons return to their original energy levels, this is called emission. When electrons absorb energy, they leap to higher energy levels. When ground-state atoms absorb energy from a radiation source, atomic absorption spectra are created. When neutral atoms in an excited state return to the ground state or a lower-energy state, they release energy, resulting in atomic emission spectra.

Lead is more ductile than iron. The correct option is A. Lead is more ductile than iron

From the question, we are to determine the statement which is true

First, we will define the term Young's modulus

Young's modulus is a measure of the stiffness of an elastic material. It is also given as the ratio of stress to strain. That is,

[tex]Young's\ modulus = \frac{Tensile\ stress}{Tensile\ strain}[/tex]

The greater the modulus, the stiffer the material.

Materials with low Young's modulus tend to be ductile and materials with high Young's modulus tend to be brittle

Since the Young's modulus value for iron is higher than that of lead, then iron is stiffer than lead.

Thus, lead is more ductile than iron. The correct option is A. Lead is more ductile than iron

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And: 89.53L

Explanation:

if u can't see the pic I'm sorry and ik my handwriting is sloppy. (I'm working on it) :)

Answer:

no

Explanation:

no its not legal to purchase it

Answer:

2.14g of oxygen

Explanation:

10g x 1mol/55.85mol x 3mol (o)/ 4mol (Fe) x 16g = 2.14g

Answer:

(O)oxygen

Explanation:

hope it helps

Answer:

medium length fur

Explanation:

incomplete dominance is when the two traits kind of combine.  u would have to make a punnet square, but in short, 100% of the offspring would have medium length fur

The boiling point elevation is a colligative property. From the calculations, the boiling point of the ethanol - sugar solution is 78.65°C.

The term colligative properties refers to those properties that depend on the number of solute particles present.

Number of moles of sugar = 20 g/342.3 g/mol = 0.058 moles

Boiling constant of ethanol = 1.22 °C⋅kg/mol

Molality of the solution = 0.058 moles/250 * 10^-3 = 0.232 m

Since sugar is a molecular substance, the Van't Hoff factor is 1

The normal boiling point of pure ethanol is 78.37 °C

ΔT = K m i

ΔT = 1.22 °C⋅kg/mol * 0.232 m * 1

ΔT = 0.28°C

Boiling point of solution =  78.37 °C + 0.28°C = 78.65°C

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Answer:

Both chlorine and bromine lies in the same group therefore they have similar properties.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Fluorine, bromine and iodine will have same properties in terms of reactivity.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The elements belonging to same group have same period. Chlorine belongs to group 17 that is to the halogen family. The elements that are in the same group of chlorine are Fluorine, bromine and iodine. Since these elements contains same number of electrons that is 7 in its outermost shell, behave equally in terms of reactivity.

Therefore, fluorine, bromine and iodine will have same properties in terms of reactivity.

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Answer:

Hence mass of 2 moles of NaCl is 117g. The molar mass of NaCl is 58.44 g/mol. To calculate mass in grams, multiply the given moles by the molar mass.

Answer:

Polyester

Explanation:

Answer:

.265 mol

Explanation:

We want to find the number of moles in 15.9 grams of SiO2

First we need to find the molar mass of SiO2

Looking at a periodic table 1 atom of Si has a mass of 28.086g

And 1 atom of oxygen has a mass of 15.999g

So the molar mass of SiO2 would be 28.086(1) + 15.999(2) = 60.084g/mol

Now we can use dimensional analysis to find the number of moles in 15.9 grams of SiO2

Setting up the table we get

[tex]\frac{15.9gSiO_2}{} *\frac{1 molSiO_2}{60.084gSiO_2}[/tex]

the g SiO2 cancels out and we get

[tex]\frac{15.9}{} *\frac{1 molSiO_2}{60.084}[/tex]

we then evaluate 15.9 * 1/60.084 to get .265 mol

So there are .265 moles in 15.9 grams of SiO2

Answer:

1. The smallest particle of an element is?

B. Atom

2. The smallest particle of matter is?

B.Atom

Explanation:

An atom is the basic building block of chemistry. It is the smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element.

Answer:

Frederich Miescher- first person to isolate DNA and RNA

Frederick Griffith- first to demonstrate horizontal transmission of dna using bacteria

Gregor Mendel- documented and demonstrated inheritance patterns

Thomas Hunt Morgan- identified chromosomes as the structures responsible for inheritance

Joachim Hammerling- demonstrated that the hereditary information of of eukaryotes is contained within the nucleus

Alfred Hershey and Martha Chase- demonstrated that dna not protein was the molecule responsible for hereditary

George Beadle and Edward Tatum- used mutants to show the relationship between DNA and proteins

Albrecht Kossel- characterized the structure of adenine, guanine, cytosine, thymine, and uracil

Explanation:

Hope this helps! Pls give brainliest!

Match the scientist with their achievement:

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Answer:

etermine the molarity for a solution of 29.2 g of NaCl is dissolved into 0.50 L of water ... - did not match any news results.

Explanation:

Answer:

Explanation:

Mint produced more than 130 billion pennies. Then, in 1982 the Mint introduced a penny that is 97.6 percent zinc and only 2.4 percent copper with a density of 7.2 g/mL. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8.8 g/mL.

Answer & Explanation:

Glass Condensation

Heat is transmitted from the hot air to the cold glass when it comes into contact with the cold glass. The water vapor near the glass loses energy due to the loss of heat in the surrounding air. Water vapor condenses into liquid on the glass as energy is lost.

Answer:

One Factor Is Ionization Energy

Another Factor Is The Electronegativity Of The Element

K is the most reactive metal from the given as it is more electronegativity..... and the valence electron are close to the nucleus...

Explanation:

Hope it helps!!!

Answer:

Potassium (K)

Explanation:

It has the furthest distance from the nucleus and the outer most electron shell meaning that the forces between the two are weaker which as a result makes it easier for Potassium to lose it's outer electron.

Forced migration effect is one likely result of a forest fire condition.

Migration is a process in which group of species like birds, animals or any living organism will go from one place to other place.

When in the forest if fire is placed then in this condition, living organism of forests such as birds, insects, animals and mammals will go to other place without their willingness. This type of migration is known as forced migration.

Hence, option (d) is correct i.e. forced migration.

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Answer:

forced migration

Explanation:

Organisms will be forced to move from their natural habitat if a forest fire takes place. This is because they will have to move from their devastating habitat to an area that is less threatening and safer for survival.

Therefore, the answer is forced migration.