Question 9 of 10
What is stoichiometry used for?
A. Calculating the mass of a product from the number of moles of
B. Calculating the molarity of the limiting reagent used in a reaction
DC. Calculating the actual yield of a product in a chemical reaction
D. Calculating the weighted average atomic mass of an element
reactants

Why can gases and liquids be paired but not solids?

The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Answer:

Here's the Sample Response: The reactants and products determine the type of chemical reaction. If there are more products than reactants, then it is a decomposition reaction. If there are more reactants than products, it is a synthesis reaction. If oxygen is a part of the reactant, it is a combustion reaction. If one ion replaces another, it is a single replacement reaction. If there are two compounds in a reactant where cations switch, it is a double replacement reaction.

Explanation:

Answer:

B. Indicator

Explanation:

An indicator is used to determine whether an acid or alkali has been added to a solution.

An acid or alkali changes the hydrogen ion concentration in solution. This is indicated by the pH of the solution after which the acid or alkali has been added.

Answer:

D. liquid

Explanation:

Matter, which is any substance that has weight and occupies space, can exists in three states namely: solid, liquid and gaseous. In this question, water is being described as matter.

According to this question, a sample of water of volume 2litres is shaped like a cylinder in one container and shaped like a rectangle in another larger container. Based on this observation, the water sample is in a LIQUID STATE because a liquid has no indefinite shape but takes the shape of its container.

Hence, this water sample, takes the shape of its cylindrical container in the first scenario and shape of its rectangular container in the second scenario.

Answer:

plants

Explanation:

because it produces ( i am a third grade student and don't know if it is right or not)

Answer:

Not affected.

Explanation:

Kinetic energy of the dominoes not affected if the first domino did not hit the second one because no kinetic energy is lost due to no collision. If the first domino hit the second one, its kinetic energy decreases and changes in other form of energy such as heat and sound energy etc. But when there is no collision occur, then there is no change in the kinetic energy of dominoes.

Answer:

A precipitation is answer

Answer:

One possible answer could be lemon juice

Explanation:

We had to do a water test, and I was looking up what pH levels were. Then I learned about it in school, so I know a thing or two about it :)

Possible other answers include stomach acid and cola.

Hope this helps!!

Answer:

1.807×10and at the top of ten put -24

Answer:

[tex]h=12.9cm[/tex]

Explanation:

Hello!

In this case, since we can consider the beaker until the 100-mL mark as a cylinder, we can use the following equation to relate its diameter, vertical distance or height and volume:

[tex]V=\pi h\frac{d^2}{4}[/tex]

Thus, since we know the diameter, volume (which is equivalent to 600 cm³) and π, we can plug in to obtain:

[tex]600cm^3=\pi *h*\frac{(77.0mm)^2}{4}[/tex]

It means it is necessary to take the mm to cm and solve for h:

[tex]h=\frac{600cm^3}{\pi*\frac{(7.70cm)^2}{4}} \\\\h=12.9cm[/tex]

Best regards!

The distance between each 100 mL mark is 2.15 cm.

The volume of a cylinder is obtained using the formula;

V = πr^2h

Now, we have the following information;

Volume of the cylinder = 600. mL or 600 cm^3

Diameter of the cylinder = 77 mm or 7.7 cm

Radius of the cylinder = 7.7/2 = 3.85 cm

Height of the cylinder  = h

Hence;

600 = 3.142 × ( 3.85 )^2 × h

h = 600/3.142 × ( 3.85 )^2

h = 12.88 cm

There are six 100 mL marks on the beaker, the distance between each 100 mL mark =  12.88 cm/6 = 2.15 cm

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Answer:

All ions must a overall charge

Explanation:

Answer:

i belive its B

Explanation:

Answer:

the effects that the scientists are causing by manipulating varuables

Answer:

When you heat up water, the water molecules start moving around faster and faster. ... So hot water is less dense than cold water. When you put the two together with the hot water on the bottom, the hot water rises to the top, mixing with the cold water along the way and creating purple water.

Explanation:

have a great day :)

The equations that show a precipitation reaction would be [tex]MgSO_4(aq) + CaCl_2(aq) --- > MgCl_2(aq) + CaSO_4(s)[/tex], [tex]FeCl_2(aq) + Na_2CO_3(aq) --- > FeCO_3(s) + 2NaCl(aq)[/tex], and [tex]2AgNO_3(aq) + Na_2S(aq) --- > Ag_2S(s) + 2NaNO_3(aq)[/tex]

It is a reaction in which two soluble salts react in aqueous solutions to form one soluble and one insoluble salt.

Thus, all the equations with an insoluble salt as one of the products will qualify as precipitation reactions. The insoluble is designated as (s).

Hence, the following are precipitation reactions:

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The question is incomplete, the complete question is;

The compound magnesium nitrate is a strong electrolyte. Write the reaction when magnesium nitrate is put into water:

Answer:

Mg(NO3)2(s)--------->Mg^2+(aq) + 2NO3^-(aq)

Explanation:

When we say that a compound is a strong electrolyte, we mean that that the compound dissociates completely in solution to form its ions.

This means that all strong electrolytes attain 100% dissociation of the solid in water according to its stoichiometric equation.

For magnesium nitrate, the reaction equation is;

Mg(NO3)2(s)--------->Mg^2+(aq) + 2NO3^-(aq)

Answer:

Sweets are sold loose, or pre-packed in 120g bags.

The 120 g bags are £1.49 each.

The loose sweets are £0.89 for 100g.

By calculating the price per gram, determine which is better value. Show your working.

Answer:

1. Oceans -> Atmosphere = Evaporation

2. Atmosphere -> Clouds = Condensation

3. Cloud -> Snow = Freezing

4. Glacier -> River = Melting

5. Cloud -> Soil = Precipitation

Explanation

1. When liquid water is heated by the sun it evaporates into the atmosphere

2. When the saturated air cools down in the atmosphere, Water vapor condenses into tiny droplets to form a cloud

3. When the Temp is below freezing, water droplets crystalize into snow flakes.

4. Glaciers melt into the River

5. The cloud precips into soil

the other person got it really wrong.

A, B, C, D, and E would be evaporation, condensation, freezing, melting, and precipitation respectively

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Answer:

Converting Grams to Moles of an Element and Vice Versa.

We can convert back and forth between grams of an element and moles.

The conversion factor for this is the molar mass of the substance. The molar mass is the ratio giving the number of grams for each one mole of the substance

molar mass is the factor

Grams can be converted to moles and vice versa so the conversion factor which is used for this is molar mass.

Mass of any substance will be converted into moles by using the below equation:

n = W/M, where

n = moles

W = given mass

M = molar mass

By using the above formula we can convert the mass of any object to moles and moles to mass.

Hence conversion factor which is used for this is molar mass(M).

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The heat produced from 48 g Aluminium = -578

Given

Reaction

2 Al + 3 CuSO4 → 3 Cu + Al2(SO4)3 ∆H = -680 kJ

48 g of Aluminum

Required

Heat released

Solution

mol of Aluminium = mass : Ar Al

mol = 48 g : 27 g/mol

mol = 1.78

From the reaction, heat released for 2 moles Al, so for 1.78 Al, the heat released :

[tex]\tt \dfrac{1.7}{2}\times -680~kJ=-578~kJ[/tex]

Answer: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.

Explanation: definition

0.042 moles of Hydrogen evolved

Given

I = 1.5 A

t = 1.5 hr = 5400 s

Required

Number of Hydrogen evolved

Solution

Electrolysis of water ⇒ decomposition reaction of water into Oxygen and Hydrogen gas.

Cathode(reduction-negative pole) : 2H₂O(l)+2e⁻ ⇒ H₂(g)+2OH⁻(aq)

Anode(oxidation-positive pole) : 2H₂O(l)⇒O₂(g)+4H⁻(aq)+4e⁻

Total reaction : 2H₂O(l)⇒2H₂(g)+O₂(g)

So at the cathode H₂ gas is produced

Faraday : 1 mole of electrons (e⁻) contains a charge of 96,500 C

[tex]\tt mol~e^-=\dfrac{Q}{96500}[/tex]

Q = i.t

Q = 1.5 x 5400

Q = 8100 C

mol e⁻ = 8100 : 96500 = 0.084

From equation at cathode , mol ratio e⁻ : H₂ = 2 : 1, so mol H₂ = 0.042

Answer:

D

Explanation:

Answer:

C they have different frames of reference

Explanation:

Answer:

I am pretty sure it is C.

Explanation:

Because the wave frequency's tell us the number of waves there are on that diagram.

Answer:

C. the number of vibrations per second an object is making

Explanation:

Hope this helps. Sorry if it doesn't. T^T

Answer:

B. None of these

Explanation:

Answer:

2Fe₂O₃(s) → 4Fe(s) + 3O₂(g)

Explanation:

The unbalanced reaction is:

To balance the oxygen atoms, we put a 2 before Fe₂O₃ and a 3 before O₂(g) - so as to make the total of O atoms in both sides 6 -:

There are four Fe atoms on the left side and only one on the right side, so we put a 4 before Fe(s):

Now the equation is balanced: there is an equal number of both Fe and O atoms in both sides of the equation.

Answer:

Hence the name of the compound is vanadium (III) sulfide

The chemical symbol for the vanadium(III) sulfide compound is [tex]V_2S_3[/tex]. In this chemical, vanadium (V) is found in +3 oxidation state and sulfur (S) is found in the form of sulphide ions.

The compound contains two vanadium ions, as indicated by the numerical prefix "di-" before the element symbol V. An inorganic compound having a crystal structure that produces a solid is called vanadium(III) sulfide.

It is composed of sulfide anions and vanadium cations arranged in a certain way. Vanadium(III) sulfide has many uses in various industries. It can be used as a catalyst in chemical reactions, as part of some types of batteries, and as a raw material for batteries to produce ceramics and materials with specific electrical and magnetic properties.

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Answer:

I think you should use distillation cauze it helps to separate two mixtures

Answer:

A.) distillation

Explanation:

edge 2021

hope it helps you......

Answer:

1. nitrous oxide

2. copper sulfide

3. cl2o7

4. MgBr2

Explanation:

hope it helps