Answers
Is what it should be
Answer: nitrogen
Explanation:
Related Questions
please help i need to do good in this class
Answers
Answer:
Explanation:
di) number of protons is 12 for all, number of neutrons is 13 for mg- 25 and 14 for mg-26
Leila made herself a cup of hot chololate weighing 150 grams. If she started with 125 grams of milk, how many grams of hot chocolate mix did she add?
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Answer:
150g-125g
=25 of hot chocolate mix
Can someone please check my answer for question 2? If It’s wrong please correct me. Thank you
Answers
The new volume : V₂ = 1185.9 cm³
Further explanationGiven
V₁ = 571 cm³
T₁ = 260 K
T₂ = 540 K
Required
The new volume (V₂)
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
V₂ = V₁.T₂/T₁
V₂ = 571 x 540 / 260
V₂ = 1185.9 cm³
Answer:
V₁ = 571 cm³
T₁ = 260 K
T₂ = 540 K your right
Explanation:
The new volume will by 1185.9
How many particles would be found in 2.38 g of (NH4)3PO4
Answers
No. Of particles= no. Of moles x 6.0x10^23 = 0.02 x 6.0x10^23 = 1.2x10^22
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].
Computation for number of molecules in [tex]\rm (NH_4)_3PO_4[/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].
Learn more about the number of particles, here:
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what are oil and waters properties of matter?
Answers
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.
I need help on this please
thanks
Answers
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.
help pleaseee
find the molecular formula of a compound with a molar mass of 70.0 g/mol and an empirical formula of CH2.
Answers
Answer:
In order to find the molecular formula from an empirical formula you must find the ratio of their molecular masses.
We know that the molecular mass of the molecule is 70
gmol-1
. We can calculate the molar mass of
CH2
from the periodic table:
C=12.01
gmol−1
H=1.01
gmol−1
CH2 =14.03
gmol−1
Hence we can find the ratio:
14.03
70
≈
0.2
Practice working with numbers that have exponents. In the blank provided, write greater than, less than, or equals.
a. 10–2 ____________________ 10–3
b. 10–14 ____________________ 101
c. 10–7 ____________________ 0.0000001
d. 100 ____________________ 101
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Answer:
a. 10⁻² > 10⁻³
b. 10⁻¹⁴ < 10¹
c. 10⁻⁷ = 0.0000001
d. 100 > 10¹
Explanation:
a. 10⁻² > 10⁻³We can rewrite those numbers as 0.01 and 0.001. That way the answer becomes clearer.
b. 10⁻¹⁴ < 10¹Any positive number with a negative exponent will be less than 1.
c. 10⁻⁷ = 0.0000001In the decimal, the 1 is exactly 6 zeros away from the dot, meaning the 1 is in the seventh place.
d. 100 > 10¹10¹ is equal to 10.
9. Carbon-14 has a half-life of 5,730 years. How many years have passed after 3
half-lives?
Answers
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!
what must happen for heat to be transferred by thermal conduction?
Answers
The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.
What is Thermal Conduction ?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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why is there no reaction between copper and sodium chloride
remember I am talking of copper alone and not copper sulfate.
Answers
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
how many grams of Ca(OH)2 are needed to produce 500ml of 1.66 M Ca(OH)2 solution
Answers
To determine how many moles are in your solution, simply multiply Molarity by Volume. Molarity is expressed in units of moles/liter, so your liters will cancel out leaving you with moles. Just ensure that your units of volume are all expressed in liters before attempting the calculation:
1.66 mol/L x 0.5 L = 0.83 mol
To determine how many grams are present in a mole, you will need the molar mass of Ca(OH)2. Using a periodic table, we can determine the molar mass by adding together 1 Ca, 2 O, and 2 H. This turns out to be approximately (40+32+2) = 74 g/mol. Again, paying attention to units we can see that by multiplying moles by molar mass, we will cancel out moles and leave us with grams.
0.83 mol x 74 g/mol = 61.42 grams of Ca(OH)2
Answer: 61.42 grams of Ca(OH)2 are needed to produce 500 mL of a 1.66 M solution.
can someone help me convert these please !
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PLEASE HELP RN ITS URGENT
Answers
Answer: transporting oxygen-rich blood to the body
Explanation:
what is the physical property to the temperature when a liquid begins to boil?
Answers
Answer:
The boiling point
Explanation:
The boiling point is the temperature where a liquid starts to boil.
Answer:
the boiling point.
Explanation:
What is the molarity of a solution that has 2.87 moles of NaCl in 5020 mL of solution?
Answers
If the price of peaches increases, what can be expected?
More peaches will be sold.
Fewer peaches will be sold.
The number of peaches sold will be unaffected.
Peach orchards will produce less fruit.
Answers
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:
How does the number of protons compare to the number of
electrons in a canton
Answers
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!
If 5.3 moles of magnesium phosphate react with excess sodium chloride how many moles of magnesium chloride will be formed?
Answers
154.0831 g
Explanation:
The formula for the calculation of moles is shown below:
Given: For
Given mass = 41.0 g
Molar mass of = 24.31 g/mol
Moles of = 41.0 g / 24.31 g/mol = 1.6865 moles
Given: For
Given mass = 175 g
Molar mass of = 162.2 g/mol
Moles of = 175 g / 162.2 g/mol = 1.0789 moles
According to the given reaction:
3 moles of Mg react with 2 moles of
1 mole of Mg react with 2/3 moles of
1.6865 mole of Mg react with (2/3)*1.6865 moles of
Moles of = 1.1243 moles
Available moles of = 1.0789 moles
Limiting reagent is the one which is present in small amount. Thus, is limiting reagent. (1.0789 < 1.1243)
The formation of the product is governed by the limiting reagent. So,
2 moles of gives 3 moles of magnesium chloride
1 mole of gives 3/2 moles of magnesium chloride
1.0789 mole of gives (3/2)*1.0789 moles of magnesium chloride
Moles of magnesium chloride = 1.61835 moles
Molar mass of magnesium chloride = 95.21 g/mol
Mass of magnesium chloride = Moles × Molar mass = 1.61835 × 95.21 g = 154.0831 g
21.Electromagnetic radiation can take the form of which of the following types of waves
a.Heat
b.Light
c.Ultraviolet
d.All of the above
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Plants can provide the materials that animals use in cellular respiration, and animals can provide some of the materials that plants use for photosynthesis. The image below shows the relationship between photosynthesis and cellular respiration. According to the diagram, how does cellular respiration aid the process of photosynthesis?
It produces ATP.
It produces glucose.
It produces mitochondria.
It produces carbon dioxide
Answers
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.
What are cellular respiration and 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.
Learn more about cellular respiration and photosynthesis here:
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Stoichiometry :
2 AlCl3 + 3 MgSO4 --> Al2(SO4)3 + 3 MgCl2
If 633.1 g AlCl3 reacts, how many moles of MgCl2 are formed?
Answers
Which action could cause a sample of liquid to boil?
A. Decreasing the temperature of the liquid
B. Decreasing the sample size of the liquid
C. Decreasing the pressure on the liquid
D. Decreasing the volume of the liquid
Hurry please
Answers
Answer:
B
Explanation:
Decreasing the sample size of the liquid
hope it helps!
Turgor pressure can help plants move. Internal water pressure can cause -
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Hope this helps(:
When 5.0g of NH4CLO4 is added to 100mL of water in a calorimeter, the temperature of the solution formed decreases by 3.0C?
Answers
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.
For more information about the final temperature, refer to the link:
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A scientist was studying a population of elephants. The first year, he counted a population of 80. Over the next eight
years, the population's numbers were 94, 100, 103, 110, 125, 120, 125, 120. What appears to be the carrying capacity
for this population?
0 120
0124
O 125
O 126
Answers
Answer:
The carrying capacity of this population would be 125 we know this because we see that this number occur multiple times and seems to be the tipping point after which the number of the population always go down
Answer:
The carrying capacity of this population would be 125 we know this because we see that this number occur multiple times and seems to be the tipping point after which the number of the population always go down
Explanation:
How many liters are in 100g of CoCl2?
Answers
Answer:
0.77018342688495
Explanation:
I did this
what is a compound?
Answers
Answer:
NOUN
a thing that is composed of two or more separate elements; a mixture
Explanation:
basically a mixture
A Bunsen burner usually burns methane gas (CH4) using words, write the chemical equation for this reaction.
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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]
While the Bohr model fails to show the true shape of the electron orbitals with in an atom, it is still used because it ?
Answers
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.