Chemistry High School

what evidence is there in the diagrams to support the classification of these substances as elements​

What Evidence Is There In The Diagrams To Support The Classification Of These Substances As Elements

Answers

Answer 1

Awnser your loooking fo its got to be aluminium

Explanation:i took the dang subgect

Related Questions

Why do the more complex sugar disaccharides store more energy than
monosaccharides?

Answers

Answer:

Because Disaccharides have more chemical bonds.

Explanation:

explain what is the difference between bohr and rutherford atomic models

Answers

Answer:

The Rutherford Model shows an atom with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. The Bohr model shows electrons travel in defined circular orbits around the nucleus.

Can someone help, please...?

I really can't understand this...

Answers

It’s okay to be a little intimidated by this but the answer is a lot more simple than it may look. All you have to do is multiply the standard enthalpies of formation with their stoichiometric coefficient for every chemical and subtract the reactants from the products:

6(-393.5) + 3(-285.8) -1(49) -15(0)


3. Matter with a composition that is always the same is a(n)
substance
mixture
compound

Answers

Answer:

substance

Explanation:

A pure substance is a form of matter that has a constant composition (meaning it's the same everywhere) and properties that are constant throughout the sample (meaning there is only one set of properties such as melting point, color, boiling point, etc

A tall plant (Tt) is crossed with a short plant (tt). What percent will be short?
Group of answer choices
75%

0%

100%

50%

25%

Answers

it should be 50/50 percent

so 50%

hopefully this is right !

Which of the following would be a value measured using a scale in lab?
O Actual yield
O Percent yield
O Theoretical yield
O Molar ratio

Answers

Answer:

A. Actual Yield

Since all of the others are calculated not measured outright.

After reading that a solution is a homogeneous mixture, Hala wondered about her favorite
morning drink, grape juice. Which statement about the solution that makes up grape juice is
true? *


1Sugar is one of the solvents, and grapes are one of the solutes.

2Grapes are the solvent and water is one of the solutes.
3Water is the solvent, and sugar is one of the solutes.
4Sugar is the solvent, and water is one of the solutes.​

Answers

The 3 is true that is (Water is the solvent and sugar is the solutes)

De la reacción 3Zn+ 2H2PO4----> Zn3(PO4)2 +2H2 por cada 9 moles de zinc cuantos moles de fosfato de zinc se producen

Answers

Answer:

Por cada 9 moles de zinc, 9 moles de fosfato de zinc se producen.

Explanation:

La reacción balanceada es:

3 Zn+ 2 H₂PO₄ → Zn₃(PO₄)₂ + 2 H₂

Por estequiometria de la reacción (es decir, la relación entre la cantidad de reactivos y productos en una reacción química), las siguientes cantidades de moles de cada compuesto participan de la reacción:

Zn: 3 moles H₂PO₄: 2 moleZn₃(PO₄)₂:1 mole H₂: 2 moles

Entonces podes aplicar la siguiente regla de tres: si por estequiometria 3 moles de zinc produce 1 mol de fosfato de zinc, 9 moles de zinc cuántos moles de fosfato de zinc producirá?

[tex]moles de fosfato de zinc=\frac{9 moles de zinc*1 mole de fosfato de zinc}{3 moles de zinc}[/tex]

moles de fosfato de zinc= 9

Por cada 9 moles de zinc, 9 moles de fosfato de zinc se producen.

how many mols are in 100.g of Fe?

Answers

Answer:

1.79 moles

Explanation:

1.79 moles

1.79 moles

1.79 moles

1.79 moles

Answer:1.79 moles

1.79 moles are there in 100g of iron.

Explanation:

thats the answer for it

Which of the following statements is true about the molecule shown below?

Answers

Answer:

B. The bonds are polar and the molecule is nonpolar.

Explanation:

Each bond in the molecule is polar, as indicated by the partial charges on the atoms of the molecule. However, the four atoms are arranged symmetrically around the central atom. In this case, the effects of the partial charges on opposite sides cancel out. As a result, the molecule as a whole is nonpolar. If exposed to an electric field, the molecule will not orient itself in any particular direction.

In the reaction 2 FeBr3 + 3 Cl2 → 2 FeCl3 + 3 Br2, how many grams of bromine gas are produced from 2.50 moles of FeBr3?

Answers

Answer:

but iron is 2 and 3 by its valance how could it be possible

2. Calculate the mass of Kool-Aid needed to make 0.1 L solutions at the following concentrations: a. 0.1 M b. 0.2 M c. 0.3 M d. 0.4 M e. 0.5 M

Answers

477889654 that the mass

CaC2 + 2H2O ⟶ C2H2 + Ca(OH)2

How many moles of water are needed to produce 56.8g C2H2?

Answers

Amount of moles of water is 4.36 mol

Explanation: M(C2H2) = 2·12.01 + 2·1.008 = 26.036 g/mol

Amount of substance is n= m/M= 56.8 g / 26.036 g/mol= 2.18159 mol

Water is needed 2·2.18 mol = 4.36 mol

in today's pandemic,how can you protect our ozone depletion?​

Answers

Answer:

if you want to protect our ozone depletion you have aerosol products that don't contain HCFCs and CFCs as stimulus or incitement

Explanation:

why you should use aerosol because when the liquid mixture is freeded or released from the aerosol the liquid propellant becomes a gas so this can easily break up the product into a fine haze or a mist hope its helpful have a good luck

is K2CO3 a reactant or product ?

Answers

Answer:

Product

Explanation:

Honestly I’m just guessing based on the fact it’s simplified and doesn’t have a really long chemical equation.

Product
Hope this helps

Please help will mark brainiest as well.!!

Answers

ok owoeiwowoeoeowo itiw
Newton’shxiejdjnxkel ex

Someone help please ...

Answers

Answer:

Yes

Explanation:

heeeeeeeeeeeeeeelpheeeeeeeeeeeeeeelp

Answers

Answer:

the mirror forms a virtual inlarged image

Explanation:

Ethanol, C2H5OH, reacts with phosphorus trichloride, PC13:
3C2H5OH(aq) + PC13(aq) - 3C2H5C1 (g) + H3PO3(aq)
Which is the actual mass of chloroethane, C2H5CI, produced if 138.0 g of ethanol is
consumed in excess phosphorus trichloride? The percentage yield for this reaction is
93.00 %.

Answers

Answer:

no

Explanation:

no

A 55 kg person on Earth has the __________mass on the moon.

Answers

Answer:

89.1 N

Explanation:

W = m gm = 55.0 x 1.62 = 89.1 N

How many moles of ammonia gas can be formed from 14.0 L of hydrogen gas 300 K and a pressure of 2.0 atm

Answers

Answer:

n = 1.14 mol

Explanation:

Hello there!

In this case, according to the ideal gas law:

[tex]PV=nRT[/tex]

It is possible to solve for the moles of the gas given the volume, temperature and pressure:

[tex]n=\frac{PV}{RT}[/tex]

Thus, we plug in 14.0 L, 300 K and 2.0 atm to obtain:

[tex]n=\frac{2.0atm*14.0L}{0.08206\frac{atm*L}{mol*K}*300K}\\\\n=1.14mol[/tex]

Best regards!

Balancing chemical equation:
_Na+_MgF2—>_NaF+_Mg
Na= ? Na= ?
Mg= ? Mg= ?
F= ? F= ?

Answers

2Na + MgF2 → 2NaF + Mg

Give one example of
a) Homogeneous mixture of two elements

Answers

Answer:

honey

Coffee

blood

Explanation:

These components are uniformly distrubuted and these cannot be seperated unlike heterogeneous

Water (Hydrogen and oxygen)
Ammonia (nitrogen and hydrogen)
Methane(carbon and hydrogen)
Table salt ( sodium and chlorine)

__Is when water changes from a solid to a liquid

Answers

melting

andnfndlzns d

When water changes from a solid to a liquid it is called melting.

Solid ice melts and forms into a liquid: water.

If this incorrect, please, don't refrain to tell me. Thank you.

Why do power plants emit such a high percentage of pollutants?

Answers

They burn fossil fuels, which releases huge amounts of sulfur dioxide and nitrogen oxide that pollute the air. ... Two thirds of all sulfur dioxide and more than one third of all nitrogen oxides that pollute the air.

They burn fossil fuels

Which statement is true about solids?


Their particles can flow over one another, so they have a fixed volume but no fixed shape.

Their motionless particles are packed together in a fixed arrangement.

Their vibrating particles are packed together in relatively fixed positions.

Their fast-moving particles can expand to take the shape of their container.

Answers

Answer:

3

Explanation:

Answer:

Their vibrating particles are packed together in relatively fixed positions.

Explanation:

As you can see in the image below, solid is packed together.

two different people run a race the graphs track their distance vs. times during the race. Explain the difference between the two runners motions. use words like speed and acceleration.

Answers

Answer:

Runner A is moving at a constant speed, therefore has a positive acceleration.

Runner B is moving at a constant speed, stopping, then speeding up again.

Explanation:

3) Explain why elements in the same group
similar properties​

Answers

Answer:

The elements of the same group have the same number of valence electrons, that is why they have similar properties

in which way are sugars usually transported throut a pine tree

Answers

the sugar is transported from pholem in plants

Which is an example of mechanical weathering?

Answers

Answer:

carbonic acid in water dissolving limestone

hope this ans helps

have a great day

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