Which of the following should be measured with a meter stick, not a tape measure?
A.
the length of ribbon needed to tie around a vase
B.
the size of a student's waist
C.
the distance from the ground to the top of a ramp
D.
the circumference of an orange

Answer:

Sodium hydroxide

Calcium sulfate

Ammonium cyanide

Aluminum sulfate

Explanation:

Just did it

The correct name for given compound is , NaOH (sodium hydroxide) , [tex]CaSO_{4}[/tex] (Calcium sulfate) , [tex]NH_{4} CN[/tex] (ammonium cyanide) and Al2(SO4)3 (aluminum sulfate).

A chemical compound can be defined as a substance made up of numerous identical molecules bound together through chemical bonds and made up of atoms from different elements.

Sodium hydroxide is the kind of organic compound which chemical formula is NaOH.

The name of given compound is :

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Answer:

Sodium has a strong affinity for water and reacts violently with water to produce hydrogen gas. Since hydrogen is highly combustible, it will immediately catch fire. As a result, the fire will spread instead of getting extinguished.    ok

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 100 g

volume = 20 mL

So we have

[tex]density = \frac{100}{20} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

i think its a mixture because it has different things mixed with it like chocolate, marshmallows and other stuff

Explanation:

Answer:

58.44 g of NaCl are needed.

Explanation:

Given data:

Mass of NaCl needed = ?

Volume of solution = 200 mL (200/1000 =0.2 L)

Molarity of solution = 5 M

Solution:

We will solve this problem through molarity formula.

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Now we will put the values.

5 M = moles of solute / 0.2 L

Moles of solute = 5 mol/L × 0.2 L

Moles of solute = 1 mol

Mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 1 mol × 58.44 g/mol

Mass = 58.44 g

Thus, 58.44 g of NaCl needed.

Answer:

98g

Explanation:

h=1*2=2

s=32

0=16*4=64

64+32+2=98

Answer:

1 : 1

Explanation:

In the molecule of NaCl, we notice that there is 1 Na for a Cl atom and hence we have the same number of Na and Cl atoms in any number of molecules since no matter how many molecules we add, the Na to Cl ratio will be maintained

Answer:

The supersaturated solution

it is a solution usually very sugary

excess solute

the supersaturated solution is a solution

where there is solute and solvent, there is always interaction

Explanation:

The supersaturated solutions are solutions where the solute is in excess, the solute is in constant interaction with the solvent and being in excess it precipitates to the bottom of the solution.

A supersaturated solution has a very high osmolarity.

Explanation:

2 V2O5 --> 4 V + 5 O2

from the formula, you know that

2 mol V2O5 give 5 mol O2

then 5.50 mol V2O5 will give

(2 mol V2O5)/(5 mol O2)=(5.50 mol V2O5)/(x mol O2)

(x mol O2)=(5.50 mol V2O5)×(5 mol O2)/(2 mol V2O5)

x mol O2 = 13.75

(16×2)g o2 / 1 mol o2 = x g o2 / 13.75 mol o2

32g o2 × 13.75 mol o2 / 1 mol o2 = x g o2 = 440g o2

hope it was helpful!

Answer:

D

Explanation:

Protons have pretty much nothing to do with reactions, but electrons affect reactions because that is how elements bond. A neutral sodium atom has 11 electrons while a neutral neon atom has 10 electrons, meaning D is correct.

Sodium is more likely to react with another element than an element such as neon because sodium has one more electron than neon. Thus, option D is correct.

Silver is a shiny metal that conducts electricity very well. It can be molded into thin sheets it means it can spread into a like a sheet and these type of properties is known as malleability.

Potassium is dull and brittle it means that it can't be change into sheet when you try to change in sheet it will break and these properties are called as brittlness and when it is has been dissolved into water, which it does quite easily. Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points and boiling points.

Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6. The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .

Therefore,Sodium is more likely to react with another element than an element such as neon because sodium has one more electron than neon. Thus, option D is correct.

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Answer:

Gt

Explanation:

Answer:

The mass of  1.00 ×10²³ molecules of N₂ is 4.76 g.

Explanation:

Given data:

Number of molecules of N₂ = 1.00 ×10²³ molecules

Mass in gram = ?

Solution:

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.

For example,

1 mole of N₂= 6.022 × 10²³ molecules of N₂

1.00 ×10²³ molecules of N₂ × 1 mole of N₂/6.022 × 10²³ molecules of N₂

0.17 moles of N₂

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.17 mol × 28 g/mol

Mass = 4.76 g

The mass of  1.00 ×10²³ molecules of N₂ is 4.76 g.

Answer:

164g

Explanation:

3×23+31+16×4

≈69+31+64

≈164.0 g

The molar mass of sodium phosphate, [tex]\rm Na_3PO_4[/tex] is 163.94 g/mol. The correct answer is option C.

Molar mass of a compound is the sum of atomic mass of each atom present in the molecule.

The molar mass of sodium phosphate, [tex]\rm Na_3PO_4[/tex], can be calculated by adding the atomic masses of the constituent atoms.

The atomic masses of sodium (Na), phosphorus (P), and oxygen (O) are 23 g/mol, 31 g/mol, and 16 g/mol, respectively.

Therefore, the molar mass of one molecule of sodium phosphate is:

= 3(Na) + 1(P) + 4(O)

= [tex]\rm (3 \times 23\ g/mol) + 31\ g/mol + (4 \times 16 \ g/mol)[/tex]

= 164.0 g/mol

Therefore, the molar mass of sodium phosphate ([tex]\rm Na_3PO_4[/tex]) is option C. 163.94 g/mol.

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Answer:

a biological community of interacting organisms and their physical environment.

Explanation:

The four ecosystem types are classifications known as artificial, terrestrial, lentic and lotic

Answer:

a biological community of interacting organisms and their physical environment.

Explanation:

I took biology and this is the definition of an ecosystem. :)

Answer:

The wavelength of these photons will become longer. The energy of each of these photons will become lower.

Explanation:

Light can be considered as electromagnetic waves. The wavelength of a wave is equal to the minimum distance between two troughs (lowest points) in this wave. On the other hand, the frequency of a wave is equal to the number of wavelengths that this wave travels in unit time.

Assume that the speed of light stays the same. The distance that this beam of light travels in unit time will be the same. However, with a lower frequency, there would be fewer wavelengths in that same distance. Therefore, the size of each wavelength will become longer.

If [tex]c[/tex] represent the speed of light and [tex]f[/tex] represents the frequency, then the wavelength would be:

[tex]\displaystyle \lambda = \frac{c}{f}[/tex].

The energy [tex]E[/tex] of each proton of a beam of light is proportional to the frequency [tex]f[/tex] of the light. Let [tex]h[/tex] denote Planck's Constant. The numerical relation between [tex]E\![/tex] and [tex]f\![/tex] would be:

[tex]E = h\, f[/tex].

Therefore, if the frequency [tex]f[/tex] of this light becomes smaller, the energy [tex]E[/tex] of each of its proton will also become proportionally lower.

Explanation:

The correct formula for calcium fluoride is CaF2 (with two fluoride ions per calcium ion). Therefore, 2.25 moles of CaF2 contains:

- 2.25 moles of Ca2+ ions (since there is one calcium ion for every molecule of CaF2)

- 2 x 2.25 = 4.50 moles of F- ions (since there are two fluoride ions for every molecule of CaF2)

So, in total, 2.25 moles of CaF2 contains 2.25 moles of Ca2+ ions and 4.50 moles of F- ions.

Answer:

2Sb^(+3) (aq) + 3S^(-2) (aq) = Sb_2•S_3

Explanation:

First of all, let us balance the equation to give;

2Sb(OH)3 (s) + 3Na2S (aq) = Sb2S3 + 3NaOH

Now, we can observe the presence of positive Sodium ions (Na+) and negative hydroxyl ions (OH-) on both left and right sides of the equation.

Now, the two ions will cancel out. These ions are not really involved in the overall reaction and thus do not require being written in the overall equation. Hence, the overall net ionic reaction can now be written as:

2Sb^(+3) (aq) + 3S^(-2) (aq) = Sb_2•S_3

Answer: Filled and half filled orbitals are stable

Answer:

Yes

Explanation:

A molecular compound is that one which is composed of molecules formed by atoms of two or different elements. A pentacosane is an alkaline made of unbranched chain of 25 carbons atoms. It has applications in plant metabolite. The molecular formula of pentacosane is C₂₅H₅₂

Yes, pentacosane is a molecular compound.

A molecular compound is formed when two or more nonmetal atoms bond together by sharing electrons. In the case of pentacosane, it is composed of carbon and hydrogen atoms bonded together in a specific arrangement.

Pentacosane has the chemical formula C25H52, indicating that it consists of 25 carbon atoms and 52 hydrogen atoms. The carbon and hydrogen atoms in pentacosane form covalent bonds by sharing electrons.

Each carbon atom in pentacosane is bonded to four other atoms, either carbon or hydrogen. This creates a long chain of carbon atoms with hydrogen atoms attached to them.

Molecular compounds, such as pentacosane, are typically nonpolar, meaning they do not have a positive or negative charge. This is because the electronegativity of carbon and hydrogen is similar, resulting in an even sharing of electrons in the covalent bonds.

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Answer:

liquid

Explanation:

because when you see the particles inside of it, there are going to be less particles than a solid because there are more compact particles together

Answer:

electron revolving in a shell is associated with a definite amount of energy. The energy changes when it jumps to another shell that is so say when it goes from one level of energy level to another. Thus shell also gives the energy of a electron besides its location and are therefore called energy levels.

Answer:

4.254g

Explanation:

Answer:

See image attached

Explanation:

a)

The full reaction mechanism of step 1 was obtained from Bartleby and attached to this answer. The steps involved in the reaction are:

1) Loss of Br- and formation of a carbocation

2) Attack of CH3CN on the carbocation

4) Formation of a quaternary nitrogen intermediate

5) Attack of water on the quaternary nitrogen intermediate

6) Loss of the water molecule

5) Formation of the amide product

b)

i) sodium hydroxide

ii) HCl

Answer:

Silver phosphate or silver orthophosphate is a light sensitive, yellow, water-insoluble chemical compound composed of silver and phosphate ions of formula Ag3PO4.

Chemical formula: Ag3PO4

Molar mass: 418.574 g/mol

Solubility in water: 0.00065 g/100 mL

Crystal structure: cubic

Explanation:

Answer:

3 × 10²⁰ molecules C₉H₃O₄

Explanation:

Step 1: Define

Avagadro's Number: 6.02 × 10²³ atoms, molecules, formula units, etc.

Molar Mass C - 12.01 g/mol

Molar Mass H - 1.01 g/mol

Molar Mass O - 16.00 g/mol

Molar Mass C₉H₃O₄ - 175.12 g/mol

Step 2: Use Dimensional Analysis

[tex]0.1 \hspace{3} g \hspace{3} C_9H_3O_4(\frac{1 \hspace{3} mol \hspace{3} C_9H_3O_4}{175.12 \hspace{3} g \hspace{3} C_9H_3O_4} )(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} C_9H_3O_4}{1 \hspace{3} mol \hspace{3} C_9H_3O_4} )[/tex] = 3.43764 × 10²⁰ molecules C₉H₃O₄

Step 3: Simplify

We are give 1 sig fig.

3.43764 × 10²⁰ molecules C₉H₃O₄ ≈ 3 × 10²⁰ molecules C₉H₃O₄

The correct answer is B: Temperature and activation energy are the factors that affect the rate constant according to the Arrhenius equation.

According to the Arrhenius equation, which describes the relationship between the rate constant (k) of a chemical reaction and temperature, changing the factors of temperature and activation energy will affect the rate constant.

The Arrhenius equation is given by:

k = A * e^(-Ea/RT),

where k is the rate constant, A is the pre-exponential factor or the frequency factor, Ea is the activation energy, R is the ideal gas constant, T is the temperature in Kelvin, and e is the base of the natural logarithm.

From the equation, it is evident that the rate constant is directly influenced by temperature and activation energy. Increasing the temperature results in a higher rate constant, as the exponential term in the equation becomes larger. This is because higher temperatures provide more kinetic energy to the reacting molecules, leading to more frequent successful collisions and increased reaction rates.

Similarly, the activation energy affects the rate constant. A higher activation energy results in a lower rate constant, as the exponential term becomes smaller. Activation energy represents the energy barrier that reactant molecules must overcome to form products. A higher activation energy implies a slower reaction rate. option(B)

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