considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
ompare with the temperature at the end of the change?

O The temperature is always lower.
O The temperature is always the same.

O The temperature is usually lower.
The temperature is usually higher.

Answer:

positive

negative

Explanation:

Usually electricity moves from positively charged to negatively charged eletrons

Answer:

Di ko na po matandaan yung answer ko Jan kasi

nakalimutan ko po sorry talaga

Explanation:

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: 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.

J   BIJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ

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:

Being a covalent compound, the intermolecular forces between the Cl2O molecules are weak and easily overcome. Therefore little heat energy, in terms of low boiling point is involved.

The element is identified with the number of protons, and the element with 55 protons is Cs.

Since there are 54 electrons, the overall charge is +1, so the answer is [tex]\boxed{\text{Cs}^{+}}[/tex]

The ion symbol for an atom with 55 protons and 54 electrons is [tex]Cs^+[/tex]. In chemistry, a "ion" is a term used to describe an electrically charged particle.

An electrically charged particle is referred to as a "ion" in chemistry. It can be negatively charged (referred to as an anion) or positively charged (referred to as a cation). Ions are created when there is an imbalance between the number of protons and electrons in an atom, which happens when atoms gain or lose electrons. Ions are essential in many chemical processes and are in charge of an electrolytic solution's conductivity. Electric current can flow because in solution, ions are free to travel and carry electrical charges. Ions play an important role in cellular communication and the transport of chemicals through cell membranes in biological systems.

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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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They are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.

This information can be used to help the Australian Institute of Marine Biology further to understand the environment of the ocean floor because they are able to see the seas floor and can find out other creatures as well.

So we can conclude that they are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.

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The length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.

The length of the entire hydrogen atom is calculated as follows;

Length of the row = number x diameter of one

Length of the row = 4.34 x 10²³ x 10⁶ x 10⁻¹²

Length of the row = 4.34 x 10¹⁷ m

Length of the row = 4.34 x 10¹⁴ km

Thus, the length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.

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The reaction is spontaneous when TΔS is greater than zero (TΔS>0).

A spontaneous reaction is determined by applying Gib's free energy formula as follows;

ΔG = ΔH - TΔS

A reaction is spontaneous when Gib's free energy is negative.

For the given example, the change in enthalpy is negative (-286 kJ), to obtain a negative Gib's free energy, the entropy must be positive.

Thus, the reaction is spontaneous when TΔS is greater than zero (TΔS>0).

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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:

KJ8RT898TGHO7-6734354546746R476

Explanation:

Answer:

T. True

Explanation:

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

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:

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

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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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:

4 moles

Explanation:

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

So, the answer is 4 moles

Answer:

What types of intermolecular forces are important in controlling bio-molecular structure of proteins?

hydrogen bond

hope it's helpful thanks

Answer:

3600J

Explanation:

Q = mc∆T

= 50 x 0.9 x (100 - 20)

= 3600J

Answer: 25.1195 L

Explanation:

Given:

There are 0.5860 mol of Iron powder (Fe)

The volume of oxygen gas at STP is 31.5 L

The volume filled by a gas at STP is approximately 22.71 L

Therefore, the moles of oxygen gas at STP = Volume of oxygen gas at STP/ 22.71

= 35.1/22.71

= 1.5456 mol

The balanced chemical equation given for this reaction is:

4Fe(s) + 3O2 (g) ----> 2Fe2O3 (s)

Dividing the above equation by 2, yields:

2Fe(s) + 3/2O2(g) -------> Fe2O3 (s)

From the equation we see:

2 moles of Fe reacts with 3/2 mole of O2 to give one mole of Fe2O3

Thus, let x moles of O2 react with 0.5860 moles of Fe

0.5860/2=x/3/2

0.5860*3=4*x

x = 1.758/4

x =0.4395 mol

So the remaining moles of oxygen gas = 1.5456 - 0.4395

= 1.1061 mol

Therefore, the amount of oxygen gas, in litres, remaining is = 1.1061*22.71

= 25.1195 L

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:

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

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.

Boyle’s law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas. Hence, option D is correct.

The volume of a gas at a constant temperature varies inversely with the pressure exerted on it.

Boyle's law states " The pressure of a gas is inversely proportional to the volume occupied by the gas when the temperature(in kelvins) is held constant ".

[tex]P[/tex] ∝ [tex]\frac{1}{V}[/tex]

[tex]PV =CONSTANT[/tex]

This means that with an increase in the volume of gas the pressure exerted by the gas decreases or vice versa. Here variables were pressure and volume.

[tex]P[/tex] ∝ [tex]\frac{1}{V}[/tex]

Boyle’s law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas. Hence, option D is correct.

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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:

They are small molecules

Explanation: Hope this helps

Answer: C) Carbohydrates

Explanation:

A) Lipids

B) Nucleic acids

C) Carbohydrates

D) Proteins

apex