which activity is an example of a chemical change ?
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The mass of lithium metal that is used in lithium batteries is 6.17 grams,  this can be calculated by using number of moles formula.

It is defined as the ratio between mass and molar mass.

It is given by:

Number of moles = mass / Molar mass

What information do we have?

Number of moles= 0.89 moles

Molar mass of Lithium metal= 6.941 g/mol

To find:

Mass of Lithium metal=?

On substituting the values

n= m/M

0.89 = m/ 6.941

m= 0.89*6.941

m= 6.177 grams

Thus, the mass of lithium metal is 6.177 grams.

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Answer:

mechanical energy

Explanation:

Answer:

number of protons is more than the number of electrons.

Explanation:

A cation is a positively charged ion.

An ion is an atom that has lost or gained electron(s). In an ion, the number of protons and electrons are not the same.

Number of protons is the number of positively charged particles

Number of electrons is the number of negatively charged particles.

 For a cation, which is positively charged, the number of protons is more than the number of electrons.

Therefore, in cations, we have more protons than electrons.

Answer:

B: Single Displacement Reaction

Explanation:

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.

A + BX -> B + AX

For example:

Cation Replacement

Zn + CuCl2 -> ZnCl2 + Cu

Anion Replacement

Br2 + 2Ki -> 2KBr + I2

You just switch either the cation with another anion or switch an anion with another cation.

Hope it helped!

Answer:

i am 50/50 at the memoent but i have a feeling it is the cytoplasm as it isnt a cell like the others. Hope this helps :(

Explanation:

Explanation:

Mole ratio of NaOH to H2O = 2 : 1

Moles of H2O = 1.85mol * (1/2) = 0.925mol.

Mass of H2O = 0.925mol * (18g/mol) = 16.65g.

Answer:

16.65 grams of water can be produced with 1.85 moles of NaOH.

Explanation:

Mole ratio of NaOH to H2O = 2 : 1

Number of moles of water = (1/2)×1.85= 0.925 moles

Molar mass of water (H2O) = 18g/mol

Mass of the right water = 18g/mol×0.925 mol=16.65 grams

Explanation:

In balancing chemical equations, the law of conservation of matter must be strictly obeyed.

By the virtue of this, the following steps are usually taken:

Answer:

the answer would be 3 4 2 1

Explanation:

Answer:

i think iron

Explanation:

i not sure with my ans

Answer:

E = 7.11 × [tex]10^{-7}[/tex]  Cal

Explanation:

given data

efficiency = 25 %

solution

first we get here E by the power that is express as

p = [tex]\frac{E}{t}[/tex]     ...........1

E = p × t

E = 1 ×  2 × [tex]\frac{1hp}{746w} \times \frac{1hr}{3600 s}[/tex]  

E = 7.447 × [tex]10^{-7}[/tex] J

and

Ein is get by efficiency

Ein = [tex]\frac{Eout}{\eta }[/tex]        ..................2

Ein = [tex]\frac{7.447 \times 10^{-7}}{.25 }[/tex]

Ein = 29.788 × [tex]10^{-7}[/tex]  J

so required energy is

E = 29.788 × [tex]10^{-7}[/tex]  ×  [tex]\frac{1Cal}{4.184J}[/tex]

E = 7.11 × [tex]10^{-7}[/tex]  Cal

Answer:

im pretty sure c

Explanation:

Answer:

See explanation

Explanation:

According to Louis de Broglie, particles could exhibit wavelike properties and have an associated wavelength.

Now for a turtle with a mass of 450. g, 29. cm long, moving at 2.7 cm/s, recall that we can only describe a by quantum mechanics when the body is very small and its associated wavelength is large.

This object has a large mass, hence it is discussed by classical rather than quantum mechanics

Given

Reaction

C+02 = CO2

Required

The equilibrium constant

Solution

The equilibrium constant is the ratio of concentration or pressure between the product and the reactant with each reaction coefficient raised  

The equilibrium constant is based on the concentration (Kc) in a reaction  

pA + qB -----> mC + nD  

[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]

So for the reaction :

C+O₂ ⇔ CO₂

[tex]\tt Kc=\dfrac{[CO_2]}{[C][O_2]}[/tex]

The volume of the gas : V = 13.243 L

Given

n = 0.25 mole

P = 0.5 atm

T = 50 + 273 = 323 K

Required

The volume

Solution

Ideal gas law

PV=nRT

R = gas constant = 0.082 L.atm/mol K

V = nRT/P

Input the value :

V=0.25 x 0.082 x 323 / 0.5

V = 13.243 L

Answer:

In atomic number

And size

And nature of each (metal, non, or metalloide)

[tex]\Large \boxed{\sf by \ their \ properties}[/tex]

Every element has a set of particular characteristics. Each has a unique atomic and mass number because they contain a different ratio of protons and neutrons. The number of protons in an element mirrors the element's atomic number. The mass number equals the sum of the element's protons and neutrons.

According to increasing atomic numbers, chemical elements get organized. Periods and groups are the names of the horizontal rows and vertical columns, respectively. The chemical characteristics of elements within the same group are comparable due to their similar valency and number of outer electrons.

Answer:

C)0.19 mol/L .

Explanation:

Hello!

In this case, since the chemical reaction between sodium hydroxide and sulfuric acid is:

[tex]H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O[/tex]

Whereas a 1:2 mole ratio is seen between the acid and the base, we can write:

[tex]2*M_{acid}V_{acid}=M_{base}V_{base}[/tex]

In such a way, we solve for the concentration of base and plug in to obtain:

[tex]M_{base}=\frac{2*M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{2*0.13mol/L*14.9mL}{20mL} \\\\M_{base}=0.19mol/L[/tex]

Thus, the answer is C)0.19 mol/L

Best regards!

Explanation:

First determine the weight of the density bottle(A1) when it's empty.

Then fill it with the liquid you want to determine the density.

Then determine the weight of the bottle with the liquid(A2).

Then the weight of the liquid is equal to (A2 - A1)

You already know the volume of the bottle.

Apply them to density = weight/volume

Make sure to mention the temperature you measured it because density varies from one temperature to another.

Answer:

A Variac or Powermite; gradually; 50-60%.

Explanation:

A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.

Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.

In order to heat a round bottom flask in a heating mantle, plug the heating mantle into a Variac or Powermite which is typically used for controlling the level of temperature. Turn the heat up gradually, and do not exceed 50-60% of the maximum output of the device, so as to avoid any electrical issues such as overloading, short-circuit etc.

The safety precautions that must be taken when using a round bottom flask are;

I. A proper inspection of the round bottom flask for cracks, irregularities or any imperfection.

II. Ensure you avoid heating the flask while it is closed.

III. When suspending the round bottom flask on a stand, you should ensure that you use a clamp for stability.

Answer:

*helps and doesnt get deleted*

Explanation:

Answer:

The thickness of the metal sheet is 0.162 centimeters.

Explanation:

If mass within the coin is uniformly distributed, then the density ([tex]\rho[/tex]), measured in grams per cubic centimeter, can be represented by the following formula:

[tex]\rho = \frac{m}{\frac{\pi}{4}\cdot D^{2}\cdot z }[/tex] (1)

Where:

[tex]m[/tex] - Mass, measured in grams.

[tex]D[/tex] - Diameter, measured in centimeters.

[tex]z[/tex] - Thickness, measured in centimeters.

If we know that [tex]m = 83.956\,g[/tex], [tex]D = 8.62\,cm[/tex] and [tex]\rho = 8.90\,\frac{g}{cm^{3}}[/tex], then the thickness of the coin is:

[tex]z = \frac{m}{\frac{\pi}{4}\cdot D^{2}\cdot \rho }[/tex]

[tex]z = \frac{83.956\,g}{\frac{\pi}{4}\cdot (8.62\,cm)^{2}\cdot \left(8.90\,\frac{g}{cm^{3}} \right) }[/tex]

[tex]z = 0.162\,cm[/tex]

The thickness of the metal sheet is 0.162 centimeters.

Answer:

the moral amount of the gas.

Answer:

dora needs help

Explanation:

Answer:

...........................

Answer:

i think it would be c

Explanation:

sorry if it is wrong

Answer:

2NaClO₃ -> 2NaCl + 3O₂

Explanation:

The number of atoms in the reactants has to equal the number of atoms in the products.

Hope that helps.

Answer: The Eurasian Plate or both the Eurasian and Pacific Plate.

Explanation:

Answer:

a. ½O2

b. O2

c. 3O2

d. 6O2

Explanation:

Hello!

In this case, since balancing chemical reactions can be attained by adding coefficients prior to each species in the chemical equation, we infer that the following representations are correct because they have a coefficient and the molecule O2 as diatomic oxygen:

a. ½O2

b. O2

c. 3O2

d. 6O2

It means that e. and f. are wrong because even when they have the coefficient, the molecule O2 is not properly written.

Best regards!

The correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.

Oxygen molecule O2 exists as a diatomic molecule that comprises two atoms chemically bonded together.

When oxygen undergoes a chemical reaction with other compounds, the diatomicity of oxygen O2 is still usually maintained.

The coefficient of oxygen O2 varies depending on the reaction in which oxygen undergoes such as:

An oxygen molecule does not exist as 3O and 5O3 represent a reaction of ozone.

Therefore, we can conclude that the correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.

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Answer:

1. Element

2. Compound

3. Mixture

Explanation:

Elements and compounds are both pure substances. ELEMENTS are substances that contain only one type of atom. For example, Cl2 contains only chlorine atoms. COMPOUNDS, on the other hand, contain atoms of two or more elements that are chemically joined together. For example, CaCl2 contains atoms of calcium and chlorine.

MIXTURES are another kind of substances that contains more than one substances, however, unlike compounds, they are not chemically joined. Mixtures can easily be separated by physical means.

Answer:

This question perplexes me somewhat. If we as humans are not able to detect a scent or odor from certain substances, that does not of necessity mean those substances are not giving off an odor, and are therefore not “truly” odorless, just odorless to the less sensitive noses of humans.

Water is supposedly odorless, but I know quite well of a test where subjects did a blind tasting, only instead of wine these people were tasting Australian waters, sourced from different locations around the country.

All of these tasters (professionals) were able to differentiate the waters and from what I recall, were all accurate. These wine buffs use their palates as well as their taste-buds, so, were there no odor, their task would have had a greater degree of difficulty.

My own baby sister has such a sensitive palate that she can tell you if you serve her a glass of water from the fridge whether that water was fresh, straight from the tap (unfiltered), filtered or had been boiled before and whether it had been boiled for more than five minutes or not. Truly.

So I would find it difficult to answer your question, “What substances are truly odorless?” , because I am not sure of the criteria you mean by “truly” odorless. In other words, If you are talking about zero degrees, are you talking of the freezing point of water, absolute zero or zero degrees Kelvin?

I’m sure there are substances that are odorless, to humans, but are those same substances “truly” odorless, or only to our perception of them?

Hope this helps, have a wonderful day/night, and stay safe!

Answer:

13 M

Explanation:

Molar mass of AgCIO4 = 207 g/mol

Number of moles of AgCIO4= 134/207= 0.65 moles

Number of moles= concentration × volume

Concentration = number of moles/volume

Concentration = 0.65 × 1000/50 = 13 M