skateboarder left at 3:40 pm. The skateboarder arrived at 4:55 pm. How much time did
it take for him to get there?

Answer:

150g-125g

=25 of hot chocolate mix

The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.

The transfer of heat from the hotter end to the colder end of object is known as conduction.

The spontaneous flow of Heat from a hotter to a colder body ie, heat is conducted from the hotplate of an electric stove to the saucepan when it is in contact with it.

The better the conductor, the more rapidly heat will be transferred.

Thus, The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.

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Answer:

a. 47 electrons

b. 6 electrons

c. 11 electrons

d. 10 electrons

e. 53 electrons

Explanation: If you are talking about neutral atoms (where as the number of protons in an atom is equal to the number of electrons in the atom), or are just being introduced to atoms then the number of electrons will be equal to the number of protons the atom has. Or vice versa, the number of protons will be equal to the number of protons in an atom. For example, in a neutral atom, with 51 protons, will have 51 electrons. Or an atom with 5 electrons will have 5 protons.

Answer:

0.77018342688495

Explanation:

I did this

Answer:

ammonia being lighter than air, is collected by downward displacement of air in an inverted gasjar

The gas jar is used to collect ammonia gas. This gas can be barely dissolved in water. As a result, the downward displacement of water does not gather it in the jar.

With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colorless gas with a strong, pungent odor.

Because it is simpler to install inlets and outlets in one end of an erect gas jar than it is to install them on the side or the bottom, which are required for placement on a stable surface.

Ammonia is prepared in a laboratory by forcing air downward to collect the gas. Due to the high solubility of ammonia in water, it is impossible to collect ammonia gas over water.

Thus, The gas jar is used to collect ammonia gas.

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The number of particles in 2.38 g ammonium phosphate are [tex]\rm \bold{9.0345\;\times\;10^2^1}[/tex].

The number of particles in a mole of sample is given by Avogadro law. The number of particles in a mole of a sample is equivalent to [tex]\rm 6.023\;\times\;10^2^3[/tex].

The given mass of ammonium phosphate is 2.38 g.

The molar mass of ammonium phosphate is 149 g/mol

The moles of the sample is given as:

[tex]\rm Moles=\dfrac{Mass}{Molar\;mass} \\\\Moles\;(NH_4)_3PO_4=\dfrac{2.38\;g}{149\;g/mol}\\\\ Moles\;(NH_4)_3PO_4=0.015\;mol[/tex]

The available moles of ammonium phosphate is 0.015 mol.

According to Avogadro's law, the number of particles in the sample is given as:

[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;particles\\\\0..015\;mol=\dfrac{6.023\;\times\;10^2^3\;particles}{1\;mol}\;\times\;0.015\;mol\\\\ 0.015\;mol=9.0345\;\times\;10^2^1\;particles[/tex]

The number of particles in 2.38 g ammonium phosphate are [tex]\rm \bold{9.0345\;\times\;10^2^1}[/tex].

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Actually, no. While their mass may be the same (1kg), the volume of lead is a lot smaller than that of feathers. As there is the same mass stuffed in a smaller space, it must be denser. The density of water is 1 g/cm3, so if the density of the lead is more than 1g/cm3, it has to sink

Answer:

72.2 ml

Explanation:

The neutralization equation between HBr (acid) and NaOH (base) is the following:

HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)

We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:

moles HBr = moles NaOH

M(HBr) x V(HBr) = M(NaOH) x V(NaOH)

Now, we calculate the volume of NaOH with the data:

V(NaOH)= M(HBr) x V(HBr)/M(NaOH)

              = (2.60 mol/L x 50.0 ml)/(1.80 mol/L)

              =72.2 ml

Answer:

mechanical digestion is the physical part of digestion

Answer:

mechanical digestion

Explanation:

Answer:

120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300

Explanation:

Hope this helps!

Answer:

If the solution is not in contact with air, nothing will happen. If the solution is in contact with air, it will be not a reaction between copper, water and sodium chloride..

in the end there will be no reaction

Answer:

Explanation:

di) number of protons is 12 for all, number of neutrons is 13 for mg- 25 and 14 for mg-26

Answer:

Is used to predict the spectra of hydrogen and hydrogen like species

Explanation:

The Bohr's model of the atom was propounded by Neis Bohr. In his theory, an atom is composed of quantized energy levels in which electrons may be found.

The transition of an electron between energy levels leads to the absorption or emission of energy in the form of a photon of visible light. The energy absorbed or emitted depends on the energy difference between the two energy levels.

The model is successful at predicting the electronic spectra of one electron species but totally fails when the specie has more than one electron. Also, the model fails to show the true shape of the electron orbitals within an atom.

Answer:

The boiling point

Explanation:

The boiling point is the temperature where a liquid starts to boil.

Answer:

the boiling point.

Explanation:

Answer: The number of protons in cation is more than the number of electrons

Explanation:

cations are positive ions that means that they lose electrons to be stable nd have electron configuration (atomic number ) equivalent to the preceding noble gas

as : sodium 11 , it loses on electron to be stable and its electron configuration is equivalent to neon 10

so ,the number of protons in cation is more than the number of electrons

i hope it helps!

Answer:

The answer is intrusive igneous and extrusive igneous.

Explanation:

I’ve done the question on A P E X

Answer:

Two other beneficial properties of the oil include the inhibition of corrosion of metal surfaces, such as steel, and the removal of dirt and detritus via detergency.

Properties of water include its chemical formula H2O, density, melting, boiling point & how one molecule of water has two hydrogen atoms covalently bonded to one oxygen atom.

Answer:

fewer peaches will be sold

Explanation:

if the price increases less people will want to buy it, but the orchards would still get money so they wouldnt be affected

Answer:

fewer peaches

Explanation:

Answer:

24.7 C

Explanation:

I don't know how

The final temperature of 1000 ml water by the addition of 5 g ammonium perchlorate has been 24.7 degree Celsius.

With the addition of 5 g of ammonium perchlorate, the drop in temperature has been:

The addition of 5 g sample to 100 ml water has absorption of energy, that results in change in temperature of 3 degree Celsius.

The heat absorbed by sample has been given as:

Heat = mass × specific heat × change in temperature

Since, the same mass of sample has been added to 25 degree Celsius water, according to law of conservation, the change in density for both the changes has been equivalent.

The ratio of masses has been equivalent to the ratio of volume.

[tex]\rm \dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;\dfrac{Volume\;at\;1000\;ml}{Volume\;at\;100\;ml}\\\\\\\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;\dfrac{1000\,ml}{100\;ml}\\\\\\\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;10[/tex]

Since, the mass at 100 ml and mass at 1000 ml has been equal, the heat absorbed by the sample has also been equal. Equating the values:

Mass at 100 ml × Specific heat × Change in temperature = Mass at 1000 ml × Specific heat × Change in temperature

[tex]\rm 3\;degree\;Celsius\;= \;\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;\times\;Change\;in\;temperature\\\\3\;degree\;Celsius\;= \;10\;\times\;Change\;in\;temperature\\\\Change\;in\;temperature\;=\;\dfrac{3}{10}[/tex]

Change in temperature =  0.3 degree Celsius.

The initial temperature of water has been 25 degree Celsius. The change in temperature has been given by:

Change in temperature = Initial temperature - Final temperature

0.3 degree Celsius = 25 degree Celsius - Final temperature

Final temperature = 25 - 03 degree Celsius

Final temperature = 24.7 degree Celsius.

The final temperature of 1000 ml water by the addition of 5 g ammonium perchlorate has been 24.7 degree Celsius.

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Answer:

it produce atp

Explanation:

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

Cellular respiration is a metabolic process that occurs in the cells of an organism. Carbon dioxide from cellular respiration aids the process of photosynthesis.

Cellular respiration is a process that takes place in the organism's cell where the cellular oxygen or chemical energy gets utilized and converted to ATP and waste like carbon dioxide.

The carbon dioxide released by the organism in the atmosphere is used by plants in the process of photosynthesis. Photosynthesis is a process that utilizes carbon and water to form glucose and oxygen.

Therefore, cellular respiration supports the process of photosynthesis by option D. producing carbon dioxide.

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Answer:

2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur

Explanation: i took the test and got it right

The number of moles for each element in one mole of (NH₄)₂S are:

d. 2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur

The number of moles can be identified by dividing the given mass by molar mass.

In one mole of (NH₄)₂S there are moles of each participating element i.e. nitrogen, oxygen, hydrogen, and sulfur.

In this molecule, there are 2 moles of nitrogen, 8 moles of hydrogen, and one mole of sulfur.

Thus, option d is correct.

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The general chemical equation for the complete combustion (or burning) of some hydrocarbon fuel is, in words, as follows:

hydrocarbon fuel and oxygen gas react to produce carbon dioxide gas and water vapor,

or, using chemical notation,

[tex]\mathrm{C_xH_y} + z\mathrm{O_2} \rightarrow \mathit{x}\mathrm{CO_2} + \frac{\mathit{y}}{2}\mathrm{H_2O}[/tex]

where

[tex]z = x + \frac{y}{4}.[/tex]

Don't worry if that looks daunting. In our case, we are given the identity of the fuel (methane, or CH₄), so our equations will be straightforward.

In words: Methane gas and oxygen gas react to produce carbon dioxide gas and water vapor (or methane gas + oxygen gas → carbon dioxide gas and water vapor).

In chemical notation:

[tex]\mathrm{CH_4}_{\text{(g)}} + 2\mathrm{O_2}_{\text{(g)}} \rightarrow \mathrm{CO_2}_{\text{(g)}} + 2\mathrm{H_2O}_{\text{(g)}}.[/tex]

Answer:

D. The flesh should return to normal after you press it.

Explanation:

The water content stored in the flesh of the fish, paired with the elasticity are both indicators of freshness, and will cause the flesh to return to normal after its been pressed.

Answer:

na+then mg2+ then al3+

Explanation:

this is due to the distance between their nucleus and valence electron

Answer:

B

Explanation:

Decreasing the sample size of the liquid

hope it helps!