Answers
Answer:
N and P
Explanation:
Anion:
When an atom gain the electrons anion is formed. The negative sign shows that atom gain electron because number of electron are greater than protons or we can say that negative charge becomes greater than positive charge.
Cation:
When atom lose electron cation is formed. The atom thus have positive charge because number of positive charge i.e protons are increased are greater than negative charge or electron.
In given problem N and phosphorus both can gain three electrons which means negative charge becomes greater that's why the extra electron gained by atoms are written as -3 and both form anion with charge -3.
while Al form cation with charge +3 Mg form cation with charge +2 and iodine and bromine both form anion with charge of -1.
Related Questions
What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°C to 35°C
Answers
Answer:
4.704625 kJ (or 4704.625 J) is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°C to 35°C.
Explanation:
The measurement and calculation of the amounts of heat exchanged by a body or system is called calorimetry.
In this way, there is a direct proportionality relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as its mass, and the product of specific heat is produced by the body's mass. So, the equation that allows to calculate heat exchanges is:
Q = c * m * T
Where Q is the heat exchanged for a body of mass m, constituted by a specific heat substance c and where T is the temperature variation.
In this case:
The specific heat capacity (c) of water is 4,181 J / g°Cm=75 g T=35°C - 20°C ⇒ T= 15°CThen:
[tex]Q= 4.181 \frac{J}{g C} * 75 g *15 C[/tex]
Q≅4704.625 J
Being 1 kJ = 1000 J:
Q=4.704625 kJ
Finally, 4.704625 kJ (or 4704.625 J) is the amount of heat absorbed when the temperature of 75 grams of water increases from 20.°C to 35°C
When the temperature of 75 grams of water increases from 20 °C to 35 °C, the heat absorbed is 1125 calories, calculated using the specific heat formula (q = mcΔT).
Explanation:The question asks about the amount of heat absorbed when the temperature of a certain amount of water increases. We can calculate this using the specific heat formula: q = mcΔT, where 'q' is the heat absorbed, 'm' is the mass of the water, 'c' is the specific heat of water, and 'ΔT' is the change in temperature.
Given: m = 75 g (mass of water), c = 1.00 cal/g °C (specific heat of water), and ΔT = 35°C - 20°C = 15°C (change in temperature).
Plugging these values into the formula gives: q = (75 g) x (1.00 cal/g °C) x (15°C) = 1125 cal.
So, when the temperature of 75 grams of water increases from 20°C to 35°C, it absorbs 1125 calories of heat.
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Action Balanced Equation Particle View (center of
screen)
Steps you took to make the
equation balanced
Make
Ammoni
a ____ N 2 + ____ H 2 ____ NH 3
Separate
Water
___ H 2 O ___ H 2 + ___ O 2
Combust
Methane
___ CH 4 + ___ O 2
___ CO 2 + ___ H 2
Answers
Answer:
N₂ + 3H₂ → 2NH₃
2H₂O → 2H₂ + O₂
CH₄ + 2O₂ → CO₂ + 2H₂O
Explanation:
A) Make ammonia:
Chemical equation:
N₂ + H₂ → NH₃
Balanced chemical equation:
N₂ + 3H₂ → 2NH₃
Step one:
N₂ + H₂ → NH₃
N = 2 N = 1
H = 2 H = 3
Step 2:
N₂ + 3H₂ → 2NH₃
N = 2 N = 1
H = 2×3 = 6 H = 3×2 = 6
Step 3:
N₂ + 3H₂ → 2NH₃
N = 2 N = 1×2 = 2
H = 2×3 = 6 H = 3×2 = 6
B) separate water:
Chemical equation:
H₂O → H₂ + O₂
Balanced chemical equation:
2H₂O → 2H₂ + O₂
Step one:
H₂O → H₂ + O₂
H = 2 H = 2
O = 1 O = 2
Step 2:
2H₂O → H₂ + O₂
H = 2×2 = 4 H = 2
O = 1×2 =2 O = 2
Step 3:
2H₂O → 2H₂ + O₂
H = 2×2 = 4 H = 2×2 = 4
O = 1×2 =2 O = 2
C) Combust methane
Chemical equation:
CH₄ + O₂ → CO₂ + H₂O
Balanced chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Step one:
CH₄ + O₂ → CO₂ + H₂O
C = 1 C = 1
H = 4 H = 2
O = 2 O = 3
Step 2:
CH₄ + 2O₂ → CO₂ + H₂O
C = 1 C = 1
H = 4 H = 2
O = 2×2 = 4 O = 3
Step 3:
CH₄ + 2O₂ → CO₂ + 2H₂O
C = 1 C = 1
H = 4 H = 2×2 = 4
O = 2×2 = 4 O = 2 + 2 = 4
Substance being reduced?
Answers
Answer:
[tex]Ni^{2+}[/tex]
Explanation:
From the equation attached , [tex]Ni^{2+}[/tex] is reduced. This is because reduction is equivalent to decrease in the oxidation number. In the equation , The oxidation number of Ni is reduced from +2 to 0.
NB, The oxidation number of a neutral atom is zero
PPLLLZZZ HHEEEELLLPPPP
Answers
Answer:
B) Cell Membrane
Explanation:
A) Chloroplasts are NOT in all cells, A is incorrect
C) Centrioles are for cell division, C is not correct
D) Cell walls are NOT in all cells, D is not correct
B) the cell membrane is responsible for materials traveling into and out of the cells to maintain homeostasis
Which property is common to noble gases?
high reactivity
strong odor
brightly colored
low reactivity
Answers
Answer:
'Low reactivity' is common property of noble gases.
Explanation:
The properties of noble gases are:
They are colorless, odorless and mono atomic gases.They are found in group number 18 of the modern periodic table.For example ; helium , xenon etc.They have completely filled [tex]ns^2np^6[/tex] electronic configuration in their valence shells which accounts for their inert nature and low reactivity.They have high ionization enthalpies.The electron gain enthalpies of noble gases are positive.Define energy conservation.
Answers
Answer:
Energy Conservation is the effort made to reduce the consumption of energy by using less of an energy service.
Energy conservation refers to both the physical principle that energy cannot be created or destroyed and the practical approach of reducing energy consumption and improving efficiency. It involves both changes in individual behaviors and technological advancements to lower energy use and waste.
Energy Conservation Defined
Energy conservation is an important concept in Physics that refers to two key ideas. Firstly, it encompasses the principle that energy cannot be created or destroyed, only transformed from one form to another. This is known as the Conservation of Energy principle. Secondly, in a more practical sense, energy conservation relates to methods and strategies aimed at reducing energy waste and enhancing efficiency. This includes behaviors like turning off lights when not in use, driving efficiently, and using energy-efficient appliances.
Conservation of energy ensures that we reduce our consumption, either by decreasing activities that use energy or by improving the efficiency with which we perform tasks. An example of increasing efficiency would be implementing technological advancements, such as better-insulated homes, which require less energy for heating.
In summary, energy conservation serves both as a fundamental physical law and as a practical approach to manage and reduce energy usage in our daily lives. This dual understanding facilitates the development of sustainable practices and the creation of more efficient technologies, aimed at minimizing our ecological footprint.
Sample of gas occupies 10.0 L at 50 ˚C. Assuming that the pressure is constant what volume will
the gas occupy at 100 ˚C?
Answers
Answer:
20 Liters
Explanation:
If the pressure is supposed to be constant, one of Charles - Gay Lussac's laws can be used to solve the exercise. His statement says that "the volume of the gas is directly proportional to its temperature at constant pressure", mathematically it would be:
[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]
Considering T₁ = 50 ° C; V₁ = 10.0 L; and T₂ = 100 ° C, we can calculate the volume V₂ Clearing it from the equation and replacing the values to perform the calculation:
V2= (V1 x T2) / T1 = (10.0 L x 100°C) / 50 °C = 20 L
Therefore, the gas at 100 ° C will occupy a volume of 20.0 L.
To find the volume a gas will occupy at a higher temperature at constant pressure, use Charles's Law formula V1/T1 = V2/T2. After converting Celsius to Kelvin, solving the problem indicates the new volume at 100 °C would be approximately 11.54 L.
Explanation:The question involves calculating the change in volume of a gas when it is subjected to a change in temperature, knowing that the pressure is held constant. This is a problem that can be addressed using Charles's Law, which states that the volume of a gas is directly proportional to its temperature on a Kelvin scale. To solve the problem, you must first convert the temperatures from Celsius to Kelvin by adding 273.15 to each temperature. Once you have the temperatures in Kelvin, you can use the formula V1/T1 = V2/T2, where V1 is the initial volume, T1 is the initial temperature, V2 is the final volume, and T2 is the final temperature.
In this case, the initial temperature is 50 °C (323.15 K) and the final temperature is 100 °C (373.15 K). The initial volume is 10.0 L, and you are solving for the final volume.
Using the formula:
V2 = V1 * (T2/T1) = 10.0 L * (373.15 K / 323.15 K) = 11.54 L
This is the volume the gas will occupy at 100 °C at constant pressure.
2 different elements have the same number of neutrons
Answers
Answer:
Sodium and Magnesium are the two different element having same number of neutrons.
Explanation:
Neutron:
It is a subatomic particle,but without an electric charge,present in all the atomic nuclei except those of ordinary hydrogen.
Its symbol is n with no charge on it.
sodium and magnesium have the same number of neutrons.
name of the element : Sodium
symbol: Na
atomic number: 11
number of protons: 11
number of neutrons: 12
number of electrons: 11
distribution of electrons: 2 , 8 , 1
valency: 1
name of the element : Magnesium
symbol: Mg.
atomic number: 12
number of protons: 12
number of neutrons: 12
number of electrons: 12
distribution of electrons: 2 , 8 , 2
valency: 2
Sodium metal reacts with water to form hydrogen gas: 2 Na + 2 H2O -> 2 NaOH + H2. 10 moles of Na thrown into a large volume of water will produce
Answers
Answer:
Only 10 mole of water will react with 10 mole of Na metal
and produce
10 moles of NaOH5 moles of H₂ gasHeat10Na + 10H₂O --------------> 10NaOH + 5H₂
Explanation:
2Na + 2H₂O -------------> 2NaOH + H₂
Exothermic Reaction:
This reaction is supper exothermic and when sodium metal react with water it produce a lot of heat.
Limiting Reagent:
Limiting reagent is the amount of reactant in a chemical reaction that determines the amount of products that will be produce.
For instance we will use the same equation
2Na + 2H₂O --------------> 2NaOH + H₂
The reaction shows that 2 mole of sodium combine with 2 mole of water and will produce 2 mole of NaOH and 1 mole of Hydrogen gas.
if we increase the amount of water to 4 mole then the same amount of product will form, and the extra water will remain unracted.
Similarly if we increase amount of Na to 4 mole then only 2 mole will react and will produce same amount.
Now
if we add 10 mole of Na to a large Volume of water following thing will happen
only that amount of water will be used that requires for 10 mol of NaThe extra water will remain unreactedNaOH will producedHydrogen gas will evolveGiven Reaction:
2Na + 2H₂O --------------> 2NaOH + H₂
Data from Reaction:
2Na + 2H₂O --------------> 2NaOH + H₂
2 mole 2mole 2mole 1mole
Applying unity formula:
2 mole of Na will react with 2mole of water
So
2 mole of Na ≅ 2mole of H₂O
10 mole of Na = 10 mole of H₂O
So the same reaction will occur and produce NaOH and hydrogen gas
So, From the above reaction
2 mole of Na ≅ 2mole of NaOH
if 2 mole of Na produces 2 mole of NaOH then 10 mole will produce how much NaOH
apply the unity formula
2 mole of the Na ≅ 2 mole of NaOH
10 mole of the Na ≅ X mole of NaOH
so by cross multiplication
2 mole of Na x X mole of NaOH ≅ 2 mole of NaOH x 10 mole of the Na
we have to find moles of NaOH ....so by rearrangement of the above equation
X mole of NaOH = 2 mole x 10 mole
2 mole
X mole of NaOH= 10 mole
So
10 mole of Na will produce 10 mole NaOH
*****For Hydrogen Gas that produce :
2 mole of Na ≅ 1 mole H₂
If 2 mole of Na produces 1 mole of H₂ then 10 mole will produce how much H₂
apply the unity formula
2 mole of the Na ≅ 1 mole of H₂
10 mole of the Na ≅ X mole of H₂
so by cross multiplication
2 mole of Na x X mole of H₂ ≅ 1 mole of H₂ x 10 mole of the Na
we have to find moles of H₂ ....so by rearrangement of the above equation
X mole of H₂ = 1 mole x 10 mole
2 mole
X mole of H₂ = 5 mole
So
The following will be reaction if 10 moles Na thrown in large volume of water
Only 10 mole of water will react with it
10Na + 10H₂O --------------> 10NaOH + 5H₂ and heat
4. I'm the "brain" of the cell or so they say. I regulate activities from day to day...
Answers
Answer:
nucleus
Explanation:
it holds information needed to regulate most of the cell functions
The 'brain' of the cell is the nucleus, which regulates cell activities by managing genetic material and essential functions like growth and protein synthesis. It ensures the proper functioning of the cell, similar to the role of the human brain, which controls both mental and physical processes.
The "brain" of the cell is commonly referred to as the nucleus. Like the human brain, which is the control center of the body, the nucleus regulates the activities of the cell. It holds the cell's genetic material and is responsible for managing activities such as growth, metabolism, protein synthesis, and cell division.
The human brain, on the other hand, controls mental processes such as reasoning, imagination, memory, and language as well as physical processes like breathing and heartbeat. Both the nucleus and the human brain are essential for the proper functioning of their respective systems.
A typical day in the life of a cell involves the nucleus sending instructions for protein synthesis, which are necessary for the cell to carry out specific functions. Without the nucleus, a cell would not be able to operate efficiently, just as without the human brain, a body could not function.
Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily?
Answers
Answer:
wood shaving
Explanation:
fire would spread faster
hope that helps
Answer:
The pile of wood will catch fire more easily because the shavings of wood will be heated faster as compared to the hunk of wood.
Explanation:
The reasons for wood shaving will be burnt faster than hunk of wood are:
The wood shavings are the small peeled pieces of wood that absorb heat much faster to reach ignition temperature. The wood shavings have a surface area lower than the wooden hunk, which makes it a lot easier for them to catch fire and spread. The combustion reaction takes place during the burning of wood. The larger the surface area, the more will be the oxygen molecules required to collide with the surface, thus, the wooden log will be burnt lately than wooden shavings.Therefore, the wood shavings will be burnt faster than the hunk of wood because of the smaller surface area and the combustion reaction will be faster than hunk of wood.
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How has the growing human population changed the rate at which resources are used?
Answers
How many atoms are in 4.6 mol K?
Answers
Answer:
27.7 × 10²³ atoms
Explanation:
Given data:
Number of moles of Potassium = 4.6 mol
Number of atoms = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
For 4.6 moles of K:
One mole = 6.022 × 10²³ atoms
4.6 mol × 6.022 × 10²³ atoms= 27.7 × 10²³ atoms
Hydrogen 3 has a half life of 12.32 years a sample of h-3 weighing 3.02 grams is left for 15.0 years what will the final weight of H-3 sample be?
Answers
Answer:
The final mass of sample is 1.3 g.
Explanation:
Given data:
Half life of H-3 = 12.32 years
Amount left for 15.0 years = 3.02 g
Final amount = ?
Solution:
First all we will calculate the decay constant.
t₁/₂ = ln² /k
t₁/₂ =12.32 years
12.32 y = ln² /k
k = ln²/12.32 y
k = 0.05626 y⁻¹
Now we will find the original amount:
ln (A°/A) = Kt
ln (3.02 g/ A) = 0.05626 y⁻¹ × 15.0 y
ln (3.02 g/ A) = 0.8439
3.02 g/ A = e⁰°⁸⁴³⁹
3.02 g/ A = 2.33
A = 3.02 g/ 2.33
A = 1.3 g
The final mass of sample is 1.3 g.
Answer:
The anwer is 1.30 in plato
Explanation:
Is phosphorus a cation or anion
Answers
Answer:
So whilst Phosphorus is an anion, it will usually combine with Iron or Aluminium and act like a cation. The more fine colloids in the soil (such as clay) then the greater the ability of the soil to bind cations.
Explanation:
Explain why the reactivity series must be used for single replacement reactions, but not for double replacement.
Answers
Answer:
Here's what I get
Explanation:
In a single replacement reaction, one element must displace another element from its compound.
Thus, we must consider the reactivity series, because an element lower down in the series cannot replace one that is above it.
In a double replacement reaction, the cations change partners with the anions. All we need consider are the solubilities of the new cation-anion partners.
In a single replacement reaction, it is mandatory that one element displaces the other according to their reactivity on the reactivity series.
On the other hand, In a double- displacement reaction; the cations just exchange anions and vice versa.
An example of a single displacement reaction is;
A reaction between HCl and Na metal where Na+ ion displaces H+ ion as a result of higher reactivity.An example of a double displacement reaction is;
A reaction between NaOH and HCl to form H2O and NaCl.As such, there's no preference in double displacement reactions as ions are swapped.
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ACROSS
2. Tool that shows wind
direction
3. Temperature scale where
water freezes at 32 degrees
and boils at 212 degrees.
Answers
3. Fahrenheit scale. I’m not sure what country you are in, but this is the scale used commonly in America. It’s represented as °F.
How are heterogeneous mixtures and solutions different?
Answers
Both are considered mixtures - that is, they are made up of two or more pure substances. ... A heterogeneous mixture appears to be made of different substances. A solution appears the same throughout. In the fluid phase (gas or liquid, or any combination of those) a solution is transparent (thought not colourless).
Final answer:
Heterogeneous mixtures have non-uniform composition and can be differentiated by eye, while solutions have uniform composition throughout and no settling occurs.
Explanation:
A heterogeneous mixture is a combination of two or more substances in which the composition is not uniform throughout the sample, and the individual substances can be differentiated by eye. Examples of heterogeneous mixtures include trail mix, salad, and blood. On the other hand, a solution is a type of homogeneous mixture where the composition is uniform throughout and no settling occurs. Solutions can be colored but are transparent, and the dissolved species are molecules or ions. Examples of solutions include air, simple syrup, and seawater.,
how can you make the gravitational force between two 50kg objects less than the gravitational force between two 5kg objects
Answers
Explanation:
The gravitational force between two 50kg objects could be less than the gravitational force between a 50kg and a 5kg object if the two 50kg objects are much farther apart.
Answer:
By increasing the distance between the two 50 kg objects compared with the distance between the 5 kg objects.
Explanation:
The formula for the force between 2 objects is
Fg = (G m1 m2) / r^2
where Fg is the force, G = gravitational constant, m1 and m2 are the masses of the objects and r = the distance between the objects.
So as r is increased Fg is decreased.
Counting atoms !!! Science help please
Answers
Answer:
Details are below
Explanation:
A Compound is made of number of atom of element, that have a specific ratio.
Below are the details of elements and the number of its atoms:
1) NaOH
Element : #of atoms
Na 1
O 1
H 1
__________________
Total 3
---------------------------------
2) HNO₃
Element : #of atoms
H 1
N 1
O 3
___________________
Total 4
----------------------------------
3) Li₂O
Element : #of atoms
Li 2
O 1
__________________
Total 3
------------------------------------
4) Li₂SO₄
Element : #of atoms
Li 2
S 1
O 4
____________________
Total 7
------------------------------------------
5) NH₄Cl
Element : #of atoms
N 1
Cl 1
H 4
____________________
Total 6
------------------------------------------
6) CaClO₃
Element : #of atoms
Ca 1
Cl 1
O 3
____________________
Total 5
------------------------------------------
7) H₂COCH₂
Element : #of atoms
C 2
H 4
O 1
____________________
Total 7
------------------------------------------
8) Mg(OH)₂
Element : #of atoms
Mg 1
H 2
O 2
____________________
Total 5
------------------------------------------
9) Al(OH)₃
Element : #of atoms
Al 1
H 3
O 3
____________________
Total 7
------------------------------------------
10) NH₄C₂H₃O₂
Element : #of atoms
N 1
H 7
C 2
O 2
____________________
Total 12
------------------------------------------
11) NaC₂H₃O₂
Element : #of atoms
Na 1
H 3
C 2
O 2
____________________
Total 8
------------------------------------------
12) (NH₄)₃ PO₄
Element : #of atoms
N 3
H 12
P 1
O 4
____________________
Total 20
----------------------------------------------
Each molecule has a distinct composition of atoms, and the total number of atoms varies based on the elements present and their respective quantities in each compound.
1. **NaOH (Sodium Hydroxide):**
- Sodium (Na): 1 atom
- Oxygen (O): 1 atom
- Hydrogen (H): 1 atom
- Total: 3 atoms
2. **HNO3 (Nitric Acid):**
- Nitrogen (N): 1 atom
- Oxygen (O): 3 atoms
- Hydrogen (H): 1 atom
- Total: 5 atoms
3. **Li2O (Lithium Oxide):**
- Lithium (Li): 2 atoms
- Oxygen (O): 1 atom
- Total: 3 atoms
4. **Li2SO4 (Lithium Sulfate):**
- Lithium (Li): 2 atoms
- Sulfur (S): 1 atom
- Oxygen (O): 4 atoms
- Total: 7 atoms
5. **NH4Cl (Ammonium Chloride):**
- Nitrogen (N): 1 atom
- Hydrogen (H): 4 atoms
- Chlorine (Cl): 1 atom
- Total: 6 atoms
6. **CaClO3 (Calcium Chlorate):**
- Calcium (Ca): 1 atom
- Chlorine (Cl): 1 atom
- Oxygen (O): 3 atoms
- Total: 5 atoms
7. **H2COCH2 (Formaldehyde):**
- Carbon (C): 2 atoms
- Oxygen (O): 1 atom
- Hydrogen (H): 4 atoms
- Total: 7 atoms
8. **Mg(OH)2 (Magnesium Hydroxide):**
- Magnesium (Mg): 1 atom
- Oxygen (O): 2 atoms
- Hydrogen (H): 2 atoms
- Total: 5 atoms
9. **Al(OH)3 (Aluminum Hydroxide):**
- Aluminum (Al): 1 atom
- Oxygen (O): 3 atoms
- Hydrogen (H): 3 atoms
- Total: 7 atoms
10. **NH4C2H3O2 (Ammonium Acetate):**
- Nitrogen (N): 1 atom
- Hydrogen (H): 7 atoms
- Carbon (C): 2 atoms
- Oxygen (O): 2 atoms
- Total: 12 atoms
11. **NaC2H3O2 (Sodium Acetate):**
- Sodium (Na): 1 atom
- Hydrogen (H): 3 atoms
- Carbon (C): 2 atoms
- Oxygen (O): 2 atoms
- Total: 8 atoms
12. **(NH4)3PO4 (Ammonium Phosphate):**
- Nitrogen (N): 3 atoms
- Hydrogen (H): 12 atoms
- Phosphorus (P): 1 atom
- Oxygen (O): 4 atoms
- Total: 20 atoms
In summary, each molecule has a distinct composition of atoms, and the total number of atoms varies based on the elements present and their respective quantities in each compound.
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56.5
Which sources of evidence did Wegener use to support his theory of continental drift? Check all that apply.
fossils
land features
climate change
satellite mapping
warm equatorial climates
Answers
Answer:
fossils
land features
Explanation:
if some lands had similar fossil types, it must mean that the lands were once in the proximity of each other. For example, if Africa had the same fossils as South America, it must mean that they once we're connected, so that the animals can move freely from one continent to another. Additionally, the land features of some continents are similar to a jigsaw puzzle. It seems as though we can connect the edges based on their shape.
even though new models were discovered after dalton created his created his five principles, which of these principles still holds true?
Answers
Answer:
The explanation is given below
Explanation:
Dalton was the first who putted forward the theory about atom. he describe the properties of atoms of the element. Dalton based his theory on the law of conservation of mass and the law of constant composition.
His theory has 5 basic postulates and these five principals are still true.
1. Dalton stated that all matter composed of atoms are very small in size. these smallest unit of matter (atom) take part in chemical reaction.
2. All the atoms of an element are similar in shape, size, and other properties but different from the atoms of other element.
3. This theory states all matter is made up of atoms and atom can not be created nor destroy.
4. Law of constant composition:
According to this: atoms of different elements combine in a simple, fixed and whole number ratio to form compound.
5. Atoms the element can combine in more than one ratio and form two or more compounds.
The atomic theory of Dalton explained many things.
Other models are its modification and explanation. Dalton was the first who recognize difference between atom of an element compound.
Although there are some discrepancies to explain other points but these 5 points are still workable and true.
The principle that still holds true from Dalton's atomic theory is the law of conservation of matter.
Explanation:Even though new models were discovered after Dalton created his five principles, one principle that still holds true is the idea that atoms are neither created nor destroyed during a chemical change, which is known as the law of conservation of matter. This means that the total mass of matter present in a chemical reaction remains constant.
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Which of the following can be justified by the Bohr atomic model?
X-ray formation
Geometric shape of orbitals
Energy difference The first ionization of the same group of elements
Differential linear emission spectra of different elements
Please explain why
Answers
Answer:
nani
Explanation:
omeo wa moo shindau nani
(proberly spelt it wrong too.)
When a river flows over a cliff its
Answers
Answer:Energy is coverted into a waterfall
Explanation:Answer:A waterfall is a sudden drop in a river as it flows over a rock cliff. This happens when the river passes from a layer of hard rock to a layer of softer rock, and the water erodes away the softer rock. A watershed is the term given to the land that drains water into a particular stream, lake, or river.
Standard conditions of temperature and pressure for a thermochemical equation are____.
Answers
Final answer:
STP for thermochemical equations is 273.15 K and 1 bar, previously it was 1 atm. It serves as a reference for reporting thermodynamic properties.
Explanation:
The standard conditions of temperature and pressure (STP) for a thermochemical equation are defined as a temperature of 273.15 K (0°C) and a pressure of 1 bar (100 kPa). It is important to note that previously, the old definition used a standard pressure of 1 atm. Under these conditions, we can calculate properties of gases and thermochemical data such as enthalpies of formation. For species in solution, the standard condition is a concentration of 1 Molar (1 mol/L). Pure substances are considered in their most stable form at 1 atm and at the standard temperature, unless otherwise noted in a specific text.
Significance of STP in Thermochemical Equations
The significance of STP in thermochemical equations lies in its use as a benchmark for reporting the thermodynamic properties of substances. This consistent baseline allows for the comparison and understanding of data, such as enthalpies of formation, which are essential for studying chemical reactions and processes.
The answer is option A - 0°C and 101 kPa. Standard conditions of temperature and pressure for a thermochemical equation are 0°C and 101 kPa.
Standard conditions of temperature and pressure (STP) for thermochemical equations are 0°C and 101 kPa, equating to 0°C (273.15 K) and 1 bar (100 kPa). This set of conditions is referred to as standard temperature and pressure (STP), which is defined as 0°C (273.15 K) and 1 bar (100 kPa). However, it's important to note that there have been different definitions over time, with an older definition using 1 atm (101.325 kPa) instead. For most thermochemical data and calculations, STP is used as a reference point to enable comparisons of the properties of different gases.
The question is:
Standard conditions of temperature and pressure for a thermochemical equation are _____.
A. 0°C and 101 kPa.
B. 25°C and 101 kPa.
C. 0°C and 0 kPa.
D. 25°C and 22.4 kPa.
What happens to the sun's energy when it hits clouds, ice, and snow?
It is mostly reflected.
O It is all absorbed.
It dissipates.
It transfers heat by conduction.
Answers
Answer: its mostly reflected.
What is the product if an atom of Po-209
undergoes alpha decay?
Answers
Lead-205 (Pb-205)
Explanation:We are given;
An atom of Po-209We are supposed to identify its product after an alpha decay;
Polonium-209 has a mass number of 209 and an atomic number of 84.When an element undergoes an alpha decay, the mass number decreases by 4 while the atomic number decreases by 2.Therefore, when Po-209 undergoes alpha decay it results to the formation of a product with a mass number of 205 and atomic number of 82.The product from this decay is Pb-205, because Pb-205 has a mass number of 205 and atomic number 82.The equation for the decay is;²⁰⁹₈₄Po → ²⁰⁵₈₂Pb + ⁴₂He
Note; An alpha particle is represented by a helium nucleus, ⁴₂He.When a chemical change occurs, new ________ are always formed.
Answers
new SUBSTANCES are fomed
Many common household substances may be classified as acids or bases. According to the pH scale,
A) baking soda is a weak base while bleach is a strong base
B) coffee is a weak acid while drain cleaner is a strong acid
C) oven cleaner is a weak acid while battery acid is a strong acid
D) soft drinking water is a weak base while soapy water is a strong base
Answers
Answer:
the answer is a
Explanation:
According to the pH scale, baking soda is a weak base while bleach is a strong base. Therefore, option (A) is correct.
What are acids and bases?An acid is any substance that is capable of donating a proton to another substance. A base is a molecule or ion that is capable to accept a hydrogen ion from an acid.
Acidic substances are generally identified by their sour taste. An acid is commonly a molecule that can donate an H⁺ ion and can be energetically favorable after a loss of H⁺ ion. Acids are also known to turn blue litmus paper into the red.
Bases are characterized by a bitter taste and a slippery texture. A base t can dissolve in water is also referred as an alkali. When bases chemically react with acids, they yield salts and water as products. Bases are also known to turn red litmus paper into the blue.
The pH value of the acids lies between 0 to 7 and the pH value of the acids lies between 7 to 14. Baking soda is a weak base that has a pH value of around 8 to 9 and bleach is a strong base that has a pH value of around 13.
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Why are groups 1 and 2 referred to as the s-block of the periodic table
Answers
Answer: This is because their valence electrons are located in the S - orbital
Explanation:
This is because their valence electrons are located in the S - orbital.