Answer:
Potassium chloride, KCl , is an ionic compound formed by the electrostatic force of attraction that holds the potassium cations and the chlorine anions together. Potassium, K , is located in group 1 of the Periodic Table.
Explanation:
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Importance of iron metals ions in biological System
Answer:
Metal ions are fundamental elements for the maintenance of the lifespan of plants, animals and humans. Their substantial role in biological systems was recognized a long time ago. They are essential for the maintenance of life and their absence can cause growth disorders, severe malfunction, carcinogenesis or death
Explanation:
:)
A pile of feathers has a mass of 57 g and a volume of 300 mL. Calculate the density.
Find the density of a brick that has a mass of 57 g and a volume of 12 mL.
A sample has a mass of 15 g and a volume of 3 mL. Calculate the density.
[tex]density = \frac{mass}{volume} [/tex]
1. density = 57/300
= 0.19 g/ml
2. density = 57/12
= 4.75 g/ml
3. density = 15/3
= 5.0 g/ml
Chemistry is the branch of science which make physis and biology clear true or false
Answer:
yes it is branch science make physics and biology in physics make therom and biology make defination
A car with a mass of 700 kg is moving with a speed of 20m/s.
Calculate the kinetic energy of the car.
Answer:
The answer is 140,000 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]KE = \frac{1}{2} m {v}^{2} \\ [/tex]
where
m is the mass
v is the velocity
From the question we have
[tex]KE = \frac{1}{2} \times 700 \times {20}^{2} \\ = 350 \times 400[/tex]
We have the final answer as
140,000 JHope this helps you
Please help brainiest is award.
Answer:
2 i think if not than its 4
Explanation:
Answer:
3 if its not than 4
Explanation:
Distinguish between electron affinity and electronegativity
The main difference between electronegativity and electron affinity is that electronegativity is the ability of an atom to attract electrons from outside as far as electron affinity is the amount of energy an atom receives when an electron. Electron negativity is applied to a single atom.
PLEASE HELP ME!!
Write formulas for the following compounds:
a. lithium fluoride, lithium chloride, lithium bromide, lithium iodide, lithium oxide, lithium sulfide
b. sodium fluoride, sodium chloride, sodium bromide, sodium iodide, sodium oxide, sodium sulfide
c. potassium fluoride, potassium chloride, potassium bromide, potassium iodide, potassium oxide, potassium sulfide
d. ammonium fluoride, ammonium chloride, ammonium bromide, ammonium iodide, ammonium sulfide
Answer:
a).lithium fluoride => LiF
lithium chloride =>LiCl
lithium bromide => LiBr
lithium iodide => Lil
lithium oxide =>Li₂O
lithium sulfide => Li₂
b).sodium fluoride => NaF
sodium chloride => NaCl
sodium bromide => NaBr
sodium iodide => Nal
sodium oxide => Na₂O
sodium sulfide => Na₂S
c).potassium fluoride => KF
potassium chloride => KCl
potassium bromide => KBr
potassium iodide => KI
potassium oxide => K₂O
potassium sulfide => K₂S
d).ammonium fluoride =>NH₄F
ammonium chloride => NH₄Cl
ammonium bromide => NH₄Br
ammonium iodide => NH₄I
ammonium sulfide => (NH₄)₂S
Please help me................I beg you.........
Answer:
the problem is that Gary is not the smartest snail.the hypothesis is that he thinks he can get smarter by eating super snail food everyday.
hope this helps
How much heat is absorbed when a 10.0-g sample of water is changed from 23.0⁰C to 32.0⁰C?
Answer:
376.56J
Explanation:
The amount or quantity of heat absorbed can be calculated using the formula:
Q = m × c × ∆T
Where; Q = amount of heat absorbed (J)
m = mass of water (g)
c = specific heat capacity of water (J/g°C)
∆T = change in temperature (°C)
According to the provided information in this question; m = 10.0g, c = 4.184J/g°C, final temperature = 32°C, initial temperature = 23°C
Q = m × c × ∆T
Q = 10 × 4.184 × (32 - 23)
Q = 41.84 × 9
Q = 376.56J
i need help with number 1 :/ please help me, thank you
Answer:
Amplitude is measured from the center line to the highest point in the waves.
Wavelength is the distance between one wave to the other from the highest point.
Frequency is the rate of the waves.
What’s the type of reaction and word equation for: C2H6O+2O2= 2CO2 + 3H2O
Answer:
Ethenol + Oxygen = water + Carbon Dioxide C2H5OH + 3O2 = 2CO2 + 3H2O
Explanation:
How do you use Reference Point in Science
Explanation:
A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a tree, or a sign - make good reference points.
Which substance is a heterogeneous mixture
Answer:
Is there any options?
Explanation:
weaving nearly died out because factories can make fabrics faster than people who create them by hand. question 2 options:
true OR false
Answer:
True
Explanation:
A hand weavers would take much more time in their craft than large factories did, their industry began to decline and be replaced by industrial machines.
Can somebody list only 2 ways whales are different from fish?
(Make it only like 1 sentence)
(WILL MARK BRAINLIEST)
:D
Answer:
1. whales are mammals and fish are not
2. Fish have gills which extract oxygen from the water and thus allow it to live underwater its entire life. Whales on the other hand do not have gills but instead have one or two blowholes
3. whales provide milk to their young and fish do not!
Explanation:
What is the cause of rejection of classical concept of oxidation and reduction reaction?
Answer:
Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. Reduction is the gain of electrons or a decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule.
Explanation:
To solve such this we must know the concept of redox reaction. Therefore, The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Oxidation and reduction reaction involves gain of electron and loss of electron simultaneously. This type of reaction is called redox reaction. The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.
Therefore, the cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.
Learn more about the chemical reactions, here:
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A(n) ____________ acts to maintain a relatively stable concentration of hydrogen ions in a solution.
Answer:
buffer
Explanation:
The diagram shows two molecules (A and B) with different
rates of travel on silica gel plate. Which method of separation
would be most effective to separate a mixture of A and B?
Answer: chromatography
Explanation:
how many carbon monoxide molecules are in .75 moles of carbon dioxide? just need answer
Answer:
A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
All the data is given in the question and these are as follows:-
Moles - 0.75
Na - 6.022*10^{23
The formula we are using to find the molecules is as follows:-
n = \frac{molecule}{Na}n=
Na
molecule
After, putting the value and solving it. we will get
0.75 * 6.022*10^2^3 = 4.5165*10^{23
2. What element is steel mainly
composed of?
A Iron
B. Carbon
C. Manganese
D. Silver
Answer:
Carbon
Explanation:
Steel is an alloy of iron and carbon. Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon and other alloying elements
Answer: B
Explanation:Steel is an alloy of iron and carbon.
Can some one please help
Answer:
Chadwick-he discovered the neutron. He discovered this by demonstrating a neutral particle with a mass the same as a proton through a reaction between gramma Ray's and a wax sample.
Rutherford-he discovered the concept of radioactive half-life, the radioactive element radon, and named alpha and beta radiation.
j.j.Thompson discovered that atoms where made up of smaller components. This had major effects for the field of physics.
:)
Plz solve anyone...........................
Answer:
no (units don't cancel each other out)
yes (convert both to same unit and multiply)
yes (multiply)
Explanation:
what would the formula be if the products RbCI decomposed
A decomposition reaction occurs when one reactant breaks down into two or more products. It can be represented by the general equation: AB → A + B. In this equation, AB represents the reactant that begins the reaction, and A and B represent the products of the reaction.
RbCI = rubidium chloride
-
use the following equation for the combustion of methane gas.
ch4(8) + 202(g) → co2(g) + 2h2o(1)
in a certain reaction at stp, 29.2 l of methane is combusted
with 63.3 l of oxygen.
what volume of excess reactant remains after the reaction is
complete?
lo2
Considering the definition of STP conditions and reaction stoichiometry, the volume of excess reactant that remains after the reaction is complete is 4.928 L.
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Reaction stoichiometryIn first place, the balanced reaction is:
CH₄ + 2 O₂ → CO₂ + 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CH₄: 1 mole O₂: 2 moles CO₂: 1 mole H₂O: 2 molesVolume of excess reactantYou know that in a certain reaction at STP, 29.2 L of methane CH₄ is combusted with 63.3 L of oxygen O₂.
Considering the definition of STP, you can apply the following rules of three:
if by definition of STP conditions 22.4 liters are occupied by 1 mole of methane, 29.2 L are occupied by how many moles of methane?[tex]amount of moles of methane=\frac{29.2 Lx1 mole}{22.4 L}[/tex]
amount of moles of methane= 1.30 moles
if by definition of STP conditions 22.4 liters are occupied by 1 mole of oxygen, 63.3 L are occupied by how many moles of oxygen?[tex]amount of moles of oxygen=\frac{63.3 Lx1 mole}{22.4 L}[/tex]
amount of moles of oxygen= 2.82 moles
Now you can apply the following rule of three to determine the excess reagent: if by stoichiometry 2 moles of O₂ reacts with 1 mole of CH₄, if 2.82 moles of O₂ react, how much moles of CH₄ will be needed?
[tex]moles of CH_{4} =\frac{2.82 moles of O_{2}x 1 moles of CH_{4}}{2 moles of O_{2}}[/tex]
moles of CH₄= 1.41 moles
But 1.41 moles of CH₄ are not available, 1.30 moles are available. Since you have less moles than you need to react with 2.82 moles of O₂, methane CH₄ will be the limiting reagent. And oxygen O₂ is excess reagent.
Now you can apply the following rule of three to the amount of O₂ that reacts when the limiting reactant reacts completely: if by stoichiometry 1 mole of CH₄ reacts with 2 moles of O₂, if 1.30 mole of CH₄ react, how much moles of O₂ will be needed?
[tex]moles of O_{2} =\frac{2 moles of O_{2}x 1.30 moles of CH_{4}}{1 moles of CH_{4}}[/tex]
moles of CH₄= 2.60 moles
So, after the reaction is complete, the moles of excess reactant that remains are calculated as:
2.82 moles - 2.60 moles= 0.22 moles
Finally, considering the definition of STP, you can apply the following rule of three: if by definition of STP conditions 1 mole of O₂ occupies a volume of 22.4 liters, 0.22 moles occupies how much volume?
[tex]volume=\frac{0.22 molesx22.4 L}{1 mole}[/tex]
volume= 4.928 L
In summary, the volume of excess reactant that remains after the reaction is complete is 4.928 L.
Learn more about
STP conditions:
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Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kj of heat. the bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 j/(gi°c). if the initial temperature of the calorimeter is 25.5°c, what is its final temperature? use q equals m c subscript p delta t.. 30.9°c 34.5°c 44.0°c 51.5°c
The final temperature of the bomb calorimeter is 30.9°C.
What is combustion reaction?Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.
The final temperature will be calculated by using the equation:
Q = mc(T₂ – T₁), where
Q = relesed heat from calorimeter = 24kJ = 24000J
m = mass of calorimeter = 1.30kg = 1300g
c = specific heat of calorimeter = 3.41 J/(g°C)
T₁ = initial temperature of calorimeter = 25.5°C
T₂ = final temperature of calorimeter = to find?
On putting all these values on the above equation and calculate for T₂, we get
T₂ = 24000/(1300)(3.41) + 25.5
T₂ = 30.9°C
Hence, correct option is (1) i.e. 30.9°C.
To know more about released energy, visit the below link:
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Answer:
30.9
Explanation:
right on edge 2022
Which of the following are NOT SAFE things to do, as we might get an electric shock?
1) Touching the switch of a geyser with dry hand.
2) Standing on a wooden stool to check a plug point.
3) Poking a metal rod into an electrical socket.
4) Touching the water in which an immersion heater is kept.
How does temperature, pressure, and density impact the core of the Earth?
Answer:
temperatures within the outer core range from 7,200 to 9,000 F. Pressure also increases in the outer core due in part to the weight of the crust and mantle above.The Earth's magnetic field is generated by the outer core.
Explanation:
Any 1 might help the 1 below but if it's not there, just comment
Your Q is not visible .Plz provide it
2. D, because transition metals have a high density.
3. B, because the properties of elements depend on the valence electrons.
4. C, because the atom emits a negatively charged electron, the atom becomes positively charged.
5. D, because hydrogen and helium are both lighter than air, but hydrogen is very reactive, that's why helium is used.
6. A, because it creates caustic soda.
7. C, because only fluorine and argon are gases, but argon is not two-molecular.
8. C, because iodine is either solid or gaseous. Solid iodine is gray and gaseous iodine is purple.
9. C, because all elements of the first main group have an odd number of protons and react violently with water.
10. D, because oxygen is air. Nitrogen is very reactive and helium is lighter than air.
11. A, because carbon has atomic number 6 and magnesium has atomic number 12.
12. B, because table salt is sodium chloride.
13. B, because sodium ions and neon have the same electron configuration.
14. C, because chloride ions and argon have the same electron configuration.
15. C, because calcium ions and argon have the same electron configuration.
16. D
17. C, because silicon has 4 valence electrons and a total of 14 electrons.
18. A
19. B, because it's sodium.
20. Number of protons and electron shells
21. first main group
22. seventh main group
23. cesium
24. fluorine
25. alkali metals
26. alkaline earth metals
27. halogens
28. from metal to nonmetal
29. valence electrons
30. electron shells
31. main group and subgroup
32. semi-metal
33. 18 groups and 7 periods
34. groups
35. periods
Rank lead, phosphorus, and barium in order of increasing ionization energy.
Answer:
D) Ba < Pb < P
Explanation:
Barium (Ba): 5,2117
Lead (Pb): 7,4167
Phosphorus (P): 10,4867
i would Luke to ??
Answer:
1 answer
Explanation: