Answers
Answer:
Explanation:
di) number of protons is 12 for all, number of neutrons is 13 for mg- 25 and 14 for mg-26
Related Questions
Ca+Cl2-->CaCl2 Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.
Answers
Answer:
Oxidation half
Ca -----> Ca2+ +2elecyrons
Reduction half
Cl2 + 2electrons ------> 2Cl-
Explanation:
PLEASE HELP RN ITS URGENT
Answers
Answer: transporting oxygen-rich blood to the body
Explanation:
Solid to Gas
As a change is state takes place, heat _______ and temperature _______.
A. Increases, stay the same
B. Stay the same, changes
C. Increases, increases
Answers
Answer:
c. c. c c c c c cçcc. ccccccccc
Explanation:
ccc cc
When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. So option A is correct option.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. Hence option A is correct.
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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:
37 grams of H3PO4 ????
Answers
Answer:
76 grams is the correct answer to this question
Select all that are compounds.
H2O
CH4
He
O2
NaCl
Answers
Answer:
NaCl, H2O
Explanation:
Compounds are substances that contain atoms of two or more different elements.
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!
Copper (ii) carbonate decomposes to form copper (ii) oxide grains and carbon dioxide gas is given off.
Answers
Answer:
yes
Explanation:
The correct equation for the decomposition of copper carbonate is:
CuCO3 → CuO + CO2
Calculate how many grams of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al2O3).
4Al + 3O2 → 2Al2O3
i need this like rn please.
Answers
Answer:
0.347
Explanation:
Al is the limiting reagent.
Explanation:
The stoichiometry of the reaction is such that 4 moles of Al are required for every 3 moles of diatomic oxygen. This means that if the ratio of Al to diatomic oxygen is greater than 4/3, then the oxygen is the limiting reagent. If the ratio of Al to diatomic oxygen is less than 4/3, then Al is the limiting reagent.
The problem state that the ratio of Al to diatomic oxygen is
0.32
0.26
=
16
13
=
48
39
<
52
39
=
4
3
The ration of Al to diatomic oxygen is less than 4/3, so Al is the limiting reagent.
We can also see this if we ask the question "How much Aluminum" is required to completely react 0.26 moles of diatomic oxygen??
0.26
moles
O
2
×
4
moles
A
l
3
moles
O
2
≈
0.347
moles
A
l
So it would take 0.347 moles of Al to completely react with all of the oxygen, however there is only 0.32 moles of Aluminum present, so there is not enough Al to react with all of the oxygen, and so we say that the Al is the limiting reagent.
The mass of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃) is
What is mass?
Mass of any element is equal to the product of its number of moles and molar mass.
For the compound, Aluminum oxide (Al₂O₃)
The atomic masses of Aluminum is 23 and oxygen is 16.
Molecular or molar mass = ( 2 × 23 ) + ( 3 × 16 ) units
M = 46 + 48 = 94 units
The mass of Aluminum in 1 mole of aluminum oxide ,46 grams in 94 grams
Mass of Aluminum in the given 21.6 g of Aluminum oxide will be;
94 grams of Aluminum oxide contains 46 grams of Aluminum.
21.6 grams of Aluminum oxide will contain ( 46 / 94 ) × 21.6 = 10.57g of Aluminum.
Therefore, 10.57g of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃)
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Which of the following is an example of a chemical element a. Salt B.water c.sugar d.sodium
Answers
Answer:
the answer is sodium
Explanation:
hope this helps
What is the percent composition of nitrogen in a 2.57 g sample of Al(NO3)3?
Answers
Answer:
19.8% of Nitrogen
Explanation:
In the Al(NO₃)₃ there are:
1 atom of Al
3 atoms of N
And 9 atoms of O
The molar mass of Al(NO₃)₃ is:
1 Al * (26.98g/mol) = 26.98g/mol
3 N * (14g/mol) = 42g/mol
9 O * (16g/mol) = 144g/mol
26.98 + 42 + 144 = 212.98g/mol
We can do a conversion using these molar masses to find the mass of nitrogen is the sample, that is:
2.57g * (42g/mol / 212.98g/mol) =
0.51g N
Percent composition of nitrogen is:
0.51g N / 2.57g * 100
= 19.8% of Nitrogen
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.
Which statement best explains the type of bond that will form between two elements from group 6A in the model?
A. The two elements will form a covalent bond because both elements will share a single electron in order to have full outer shells
B. The two elements will form a covalent bond because both elements will share a pair of electrons in order to have full outer shells.
C. The two elements will form an ionic bond because one of the elements will donate one electron to the other element in order to have full outer shells.
D. The two elements will form an ionic bind because one of the elements will donate two electrons to the other elements in order to have full outer shells.
*Will give brainliest*
Answers
Answer:
D is the answer
Like my answer
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option D.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The two elements will form an ionic bind because one of the elements will donate two electrons to the other elements in order to have full outer shells.
Therefore, the correct option is option D.
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Convert 4, 294 grams to pounds. Use the conversion factor 1 pound = 453.59 grams.
Answers
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
Explain how the transfer of heat causes air to rise?
plzzzzzz help mee
also friction is not the answer
Answers
Answer:
Air in the atmosphere acts as a fluid. The sun's radiation strikes the ground, thus warming the rocks. As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere.
Explanation:
I hope this helps and pls mark me brainliest :)
A camper pours 500 g of coffee, initially in a pot at 80 oC, into a 110-g aluminum cup initially at 30 oC. What is the final temperature? Assume that coffee has the same specific heat as water and that no heat is exchanged with the surroundings. (cwater=4.18 J/goC). (cAluminum=0.900J/g.C)
Answers
The final temperature : t=77.74 °C
Further explanationGiven
500 g coffee, t = 80 °C
110 g aluminum cup, t = 30 °C
Required
The final temperature
Solution
Q in = Q out
Q absorbed = Q released
Q aluminum cup = Q coffee
110 x 0.9 x (t-30)=500 x 4.18 x (80-t)
99t-2970=167200-2090t
2189t=170170
t=77.74 °C
Pls help!!
1000 L of nitrogen and 2400 L of hydrogen are mixed to produce ammonia. The volume of ammonia produced is
A. 1200 L
B. 1000 L
C. 2400 L
D. 1600 L
Answers
Answer: D. 1600 L
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}[/tex]
[tex]\text{Number of moles of nitrogen}==\frac{1000L}{22.4L}=44.6moles[/tex]
[tex]\text{Number of moles of hydrogen}==\frac{2400L}{22.4L}=107.1moles[/tex]
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to stoichiometry :
3 moles of [tex]H_2[/tex] require 1 mole of [tex]N_2[/tex]
Thus 107.1 moles of [tex]H_2[/tex] will require=[tex]\frac{1}{3}\times 107.1=35.7moles[/tex] of [tex]N_2[/tex]
Thus [tex]H_2[/tex] is the limiting reagent as it limits the formation of product and [tex]N_2[/tex] is the excess reagent.
As 3 moles of [tex]H_2[/tex] give = 2 moles of [tex]NH_3[/tex]
Thus 107.1 moles of [tex]H_2[/tex] give =[tex]\frac{2}{3}\times 107.1=71.4moles[/tex] of [tex]NH_3[/tex]
Volume of [tex]NH_3=moles\times {\text {Molar volume}}=71.4moles\times 22.4L/mol=1600L[/tex]
Thus volume of ammonia produced is 1600 L
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.
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.
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Select the correct answer.
In this reaction, what effect does a change in the concentration of substances have on the reverse reaction rate?
CaCO3(s) ⇌ CaO(g) + CO2(g)
A.
The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s).
B.
The rate of the reverse reaction increases with an increase in the concentration of CaO(g) and CO2(g).
C.
The rate of the reverse reaction decreases with a decrease in the concentration of CaCO3(s).
D.
The rate of the reverse reaction decreases with an increase in the concentration of CaO(g) and CO2(g).
E.
The rate of the reverse reaction increases with a decrease in the concentration of CaO(g) and CO2(g).
Answers
Answer:
A. The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s)
Explanation:
If the concentration of a reactant has increased, The substance will shift in the direction of the reaction that uses the reactants, So that the Reactants substance Increases.
Which statement describes why the viscosity of water is lower than that of
olive oil?
A. The molecules that make up water have more kinetic energy than
the molecules that make up olive oil.
B. The molecules that make up water can more easily slide past one
another than the molecules that make up olive oil.
C. The molecules that make up water have less kinetic energy than
the molecules that make up olive oil.
D. The molecules that make up water are larger than the molecules
Answers
Answer:
Option B. The molecules that make up water can more easily slide past one another than the molecules that make up a olive oil.
The molecules that make up water can more easily slide past one another than the molecules that make up olive oil. Hence, option B is correct.
What is viscosity?Viscosity is a term used to describe FLUIDS, which includes liquids and gases. Viscosity refers to the ability of a gas or liquid to resist flow.
Olive oil has a higher viscosity than water because it is a much larger molecule than water with larger dispersion forces.
Hence, option B is correct.
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2. A sample of oxygen gas is placed in a rigid 1.5L glass container at STP. If the gas is
heated to 100 degrees (Celcius) what is the new pressure in mmHg?
Answers
The new pressure : P₂ = 1038.39 mmHg
Further explanationGiven
1.5 L container at STP
Heated to 100 °C
Required
The new pressure
Solution
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure).
So P₁ = 1 atm = 760 mmHg
T₁ = 273 K
T₂ = 100 °C+273 = 373 K
Gay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Input the value :
P₂=(P₁.T₂)/T₁
P₂=(760 x 373)/273
P₂ = 1038.39 mmHg
1. What do microorganisms share in common?
Answers
Answer:
Bacterial species are typified by their diversity. There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size.
Explanation:
What Are the Characteristics Common to All Bacteria?
Single-Celled. Perhaps the most straightforward characteristic of bacteria is their existence as single-celled organisms. ...
Absent Organelles. ...
Plasma Membrane. ...
Cell Walls. ...
DNA.
true or false
sugar melting an example of oxidation
and
water evaporating
Answers
Answer:
false i think
Explanation:
determine the density of an object that is 25 cm long 10 cm wide and 2 cm high with a mass of 50 g
Answers
Answer:
[tex]\boxed {\boxed {\sf \rho= 0.1 \ g/cm^3 }}[/tex]
Explanation:
Density is found by dividing the mass by the volume.
[tex]\rho=\frac{m}{v}[/tex]
The mass is 50 grams, but we have to find the volume.
Assuming this is a solid rectangular object, we can use this formula for volume:
[tex]v=l*w*h[/tex]
The length is 25 centimeters, the width is 10 centimeters, and the height is 2 centimeters.
[tex]v= 25 \ cm * 10 \ cm * 2 \ cm[/tex]
[tex]v= 250 \ cm^2 * 2 \ cm[/tex]
[tex]v= 500 \ cm^3[/tex]
Now we know the mass and volume:
[tex]m= 50 \ g\\v= 500 \ cm^3[/tex]
Substitute the values into the formula.
[tex]\rho = \frac{50 \ g}{500 \ cm^3}[/tex]
[tex]\rho= 0.1 \ g/cm^3[/tex]
The density of the object is 0.1 grams per cubic centimeter.
a train is traveling on a straight track. it travels 200 kilometers in 4 hours, what measure can you find with these values?
Answers
Answer:
200 km is a measure of distance 4 hours is a measure of time Hence you can measure rate of change, instaneous rate of change, linear change and distribution of timeUpdated: SpeedThe element with the atomic mass of 12 amu, and 6 nuetrons: (E2) A (B3) (D4) O (14)
Answers
Answer:like my photo bc i like it
Explanation:
omg i look .........................................
Na * 6.02 * 10^23 pls help an it got to include na
Answers
Answer:
6.02E23Na
Explanation:
you just convert the element to a decimal form
Turgor pressure can help plants move. Internal water pressure can cause -
Answers
Hope this helps(: