Please HELP!!!! Im stuck!

Answer:

Mg S2 O3

Explanation:

.691 g of Mg  is .284 mole

1.84 g of S    is .5739 mole

1.365 g of O is  .8531 mole      you can see the ratio is ~  1 :2 :3

                                                        Mg S2 O3

Answer:

T. True

Explanation:

The correct answer would be yes, this statement is true. A mirage is cause by refraction.

Answer:

the element air is the most similar to oxygen in chemical. and physical properties

Answer:

They are small molecules

Explanation: Hope this helps

Answer: C) Carbohydrates

Explanation:

A) Lipids

B) Nucleic acids

C) Carbohydrates

D) Proteins

apex

Answer:

3.28 gm / ml

Explanation:

Density = mass/ volume  = 62.4 gm / 19 .0 ml =

3.28 g/mL is its density when an unknown substance has a mass of 62.4 g and occupies a volume of 19.0 mL.

Density is the measurement of how tightly a material is packed together.  It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

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

[tex]= \frac{62.4 gm}{19 .0 ml }[/tex]

= 3.28 g/mL

Hence, 3.28 g/mL is its density when an unknown substance has a mass of 62.4 g and occupies a volume of 19.0 mL.

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Answer:

Di ko na po matandaan yung answer ko Jan kasi

nakalimutan ko po sorry talaga

Explanation:

When the temperature and the volume of the gas stored in the container are high then the number of the moles will be measured accurately. Thus, options A and B are correct.

The ideal gas law is the establishment of the relation between the elements like the moles, pressure, temperature, and the volume of the gas containing the particle.

The ideal gas states:

PV = nRT

With an increase in the temperature, the number of particles that collides increases as the kinetic energy increases. The particle of the container is more when the volume of the gas is more.

Therefore, in options A and B high temperature and volume increase the accuracy.

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Answer:

7 cm

Explanation:

If the following digit is greater than or equal to 5, the decimal place is rounded up (moved up to the next number); if the following digit is less than 5, the decimal place stays the same.

4.6 + 2.35 = 6.95 cm

However, as stated in your question, cm is only being measured to the nearest 0.1 centimeters in your question.

So, you would round the digit 9 up by 1, meaning you would round it to 10. However, there are only nine digits available in our base-10 counting system, so you carry the value over,

6.95 cm could be rounded to '6. 100 cm', which is 7 cm.

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Answer:

The volume of  1 mole of CO2 and 1 mole of N2 are the same.

Explanation:

At STP , ONE MOLE of gas occupies 22.4 liters .

Answer:

20 moles HCl

Explanation:

To find the final answer, you need to use the mole-to-mole ratio (from the equation) to convert from moles H₂ to moles HCl. Make sure to arrange the ratios in a way that allows for the units of H₂ to cancel out.

1 H₂ (g) + Cl₂ (g) --> 2 HCl (g)

10 moles H₂          2 moles HCl
-------------------  x  ---------------------   = 20 moles HCl
                               1 mole H₂

Answer:

the final result is:oxygen-244g and hydrogen-111g

Answer:

ydgxkjth .

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Explanation:

kugoidv jugmlirsxnl no me han dicho que no es la que no se me han dicho

The binding energy of the electrons (also known as the work function of the surface) is determined as 2.43 x 10⁻¹⁹ J.

The binding energy of the electrons is also known as work function of the metal and it is calculated as follows;

Ф = E - K.E

where;

Ф = hf - 86.2 kJ/mol

Ф = hc/λ - 86.2 kJ/mol

Ф = (6.63 x 10⁻³⁴ x 3 x 10⁸ )/515 x 10⁻⁹   -  86.2 kJ/mol

Ф = 3.86 x 10⁻¹⁹ J - (86200 J/mol)/(6.02 x 10²³)

Ф = 3.86 x 10⁻¹⁹ J - 1.43  x 10⁻¹⁹ J

Ф = 2.43 x 10⁻¹⁹ J

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Answer: C

Explanation:

In endothermic reactions, enthalpy is positive, and in exothermic reactions, enthalpy is negative, So, if enthalpy is positive, then it is an endothermic reaction, and hence is required for the reaction to occur.

Option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.

Ethene (C2H4) burns in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O) along with the evolution of heat and light.

C₂H₄  + 3O₂   ----- > 2CO₂ + 2H₂O

from the equation above;

3 moles of O₂ ---------> 2(18 g) of water

3.5 moles of O₂ ----------> x

[tex]x = 3.2 \times [\frac{2 \ moles \ H_2O}{3 \ moles \ O_2} ] \times[ \frac{18.02 \ g \ H_2O}{1 \ mole \ H_2O} ][/tex]

Thus, option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.

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Answer:

https://www.quora.com/What-is-the-difference-between-HNO3-and-H2SO4

Explanation:

HNO3 is a protic acid and H2SO4 is a diprotic acid, this means that while HNO3 donates a single H+ H2SO4 donates 2 H+ ions.

HNO3 is highly volatile as compared to H2SO4.

The components are different, the molecular weights and melting point and boiling points are different.

H2SO4 is dubbed the king of acids because it has a variety of reactions, while HNO3 has quite a few reactions it is not comparable to H2SO4’s

Answer:

KJ8RT898TGHO7-6734354546746R476

Explanation:

The compounds that could exists between the ions K^+ and S^2- are K2S and K2S2.

An ionic compound is a commpound that is composed of ions. Let us note that ionic compounds are always such that the sum of the charges on the ions is zero.

Hence, the compounds that could exists between the ions K^+ and S^2- are K2S and K2S2.

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The compounds between the ions [tex]K^+[/tex] and [tex]S^{2-}[/tex] are [tex]K_2S.[/tex]

An ionic compound is a compound that is composed of ions. Let us note that ionic compounds are always such that the sum of the charges on the ions is zero.

You need two potassium atoms to form an ionic bond with one sulfur atom. Potassium ions are formed by donating and losing their electrons in the outermost shell, the lost electrons are gained by sulphur atom to form [tex]2K^+[/tex] and [tex]S^{2-}[/tex], respectively.

The attraction between the positive ions and negative ions gives rise to the ionic bond and the molecular formula is [tex]K_2S[/tex]

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Answer:

The types of energy that are involved in a chemical reaction are :

(A) Activation Energy

(B) Chemical Energy.

- The energy required for a chemical reaction to take place is known as the activation energy. - If the energy is less than the activation energy, the reaction will not take place.

Answer:

4 moles

Explanation:

For every mole of deuteriomethane consumed, 4 moles of water are produced.

So, the answer is 4 moles

Answer:

there are 310.64 grams in 9.40×10²⁵ molecules of H₂.

Explanation:

Amount of moles of H₂= (9.6 × 10²⁵ atoms × 1 mole) ÷ 6.023 × 10²³ atoms

amount of moles of H₂ = 155.32 moles

On the other hand, molar mass is the amount of mass that a substance contains in one mole. In this case, the molar mass of H₂ is 2 .

Then the mass that 155.32 mole of compound contains is calculated as:

155.32 moles × 2 = 310.64 grams

Finally, there are 310.64 grams in 9.40×10²⁵ molecules of H₂.

Moles of H_2

[tex]\\ \rm\Rrightarrow \dfrac{No\:of\: molecules}{Avagadro\:no}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{9.6\times 10^{25}}{6.023\times 10^{23}}[/tex]

[tex]\\ \rm\Rrightarrow 1.594\times 10^{2}[/tex]

[tex]\\ \rm\Rrightarrow 159.39mol[/tex]

Mass

[tex]\\ \rm\Rrightarrow Moles\times molar\:mass[/tex]

[tex]\\ \rm\Rrightarrow 159.39(2)[/tex]

[tex]\\ \rm\Rrightarrow 318.78g[/tex]

Answer: Decomposition

Explanation:

Answer:

In some cases, they could bond to form covalent compounds. However, in most instances they will not interact.

Explanation:

Remember that elements desire to have a full octet (8 valence electrons). The configuration given represents an element with 8 valence electrons. I know this because the outermost shell (denoted by the 2 coefficient) has 8 electrons (2s²2p⁶ = 2 + 6 = 8). Therefore, this element is stable.

The other atom has 7 valence electrons. Since it is 1 electron away from having a full octet, it really wants 1 more electron. The original element is unlikely to give up an electron because that would prevent it from having a full octet. As such, when the atoms are close to one another, they will most likely not interact. The element with the full octet is most likely a noble gas, and these elements rarely form bonds. Noble gases can form bonds with halogens (elements with 7 valence electrons) but only if there are excess halogens and particular noble gases in the system.

The electron configuration of an element is 1s2 2s2 2p6 is Neon with atomic number 10. They either will form covalent bond with other element of does not from bond with any other element.

Chemical bond is defined as any of the interactions that allow for the grouping of atoms into molecules, ions, crystals, and other stable species that make up ordinary substances.

It can also be defined as a connection between atoms in molecules or compounds, as well as between ions and molecules in crystals.

There are basically four types of chemical bond.

Thus, the electron configuration of an element is 1s2 2s2 2p6 is Neon with atomic number 10. They either will form covalent bond with other element of does not from bond with any other element.

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Answer:

Syukuro Manabe- Developing the first atmospheric model of Earth's climate

Susan Solomon- Pioneering the theory about how and why the ozone hole occurred in Antarctica.

James E. Hansen- Testimonies on climate change to congressional committees helped raise broad awareness about global warming.

Phil D. Jones- Developing a long-term timeline of the instrumental temperature record.

Veerabhadran Ramanathan- Discovery of the greenhouse effect of halocarbons.

The scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.

A cathode ray is a tube that contains negatively charged electrode( that is the cathode) which emits electrons when heated at a low pressure.

The cathode ray was used by the scientist, J.J. Thomson to find the ratio of charge to mass (e/m) of the electrons.

Therefore, the scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.

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Answer: endothermic

Explanation:

If the products contain more chemical energy, energy is absorbed, and thus the reaction is endothermic.

Answer: 6.25 mol

Explanation:

From the reaction that produces water from its elements (shown in the image), we know that for every mole of oxygen gas consumed, 2 moles of water are produced.

This means that 12.5/2=6.25 mol of oxygen gas is needed.

Answer:

positive

negative

Explanation:

Usually electricity moves from positively charged to negatively charged eletrons