Answer:
C:4A second period Ne:8A second period Al:3A third period K:1A fourth period Ca:2A fourth S:6A third period
Explanation:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, with the help of periodic table we can locate the element's position.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
carbon belongs to period 2 and group 14
neon belongs to period 2 and group 18
aluminium belongs to period 3 and group 13
potassium belongs to period 4 and group 1
calcium belongs to period 4 and group 2
sulfur belongs to period 3 and group 16
Therefore, with the help of periodic table we can locate the element's position.
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Hey bedoorrr
Cheetosss
Answer:
this is really insightful, thank you
Explanation:
How many atoms in 98.2 g of He?
Human body cells are made by doing what ?
Answer:
When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.
Explanation:
Which of the four fundamental forces are involved in chemical bonding?
Answer:
The electromagnetic force is an important force in the chemical and biological sciences, as it is responsible for molecular connections like ionic bonding and hydrogen bonding.
What is the systematic name of the following compound?
\text{Mn}_3 (\text {PO}_4)_2Mn
3
(PO
4
)
2
Answer:
Manganese (II) Phosphate
Explanation:
Mn3(PO4)2 is the compound given in this question. Manganese is the metal and hence it will come first in the name. Along with the name of metal it is essential to determine the valency of the metals based on the compound structure.
Here 2 PO4 attaches with 3 Mn
Valence of PO4 is -3
So the total electrons contributed by PO4 is 3*2 = 6
Now Mn has 3 atoms in the compound. Thus, per atom the valency must be 2 in order to satisfy -6 charge of PO4
Thus, valency of Mn is 2
So, the name will be
Manganese (II) Phosphate.
Four atoms have the numbers of protons and neutrons given below.
Which two atoms are isotopes of the same element?
W: 8 protons and 8 neutrons
X: 8 protons and 10 neutrons
Y: 10 protons and 8 neutrons
Z: 9 protons and 10 neutrons
X and Y
W and X
X and Z
Answer:
W and X
Explanation:
isotopes : are masses of atoms with the same number of proton and electron but different neutron .
W and X have the same number of protons and different number of neutrons.
Baking soda (sodium bicarbonate) is a compound commonly used in baked goods, as a deodorizer in refrigerators, and as an antacid. Commercial quantities of baking soda are produced by mixing soda ash dissolved in water with carbon dioxide. Baking soda precipitates as a solid from this method:
Na2CO3 + CO2 + H2O → 2NaHCO3
How many grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate?
Answer:631 g
Explanation: bc i did the math
630.581 grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate.
How we calculate moles from grams?Moles can be related to the mass or weight of any substance as follow:
n = W/M, where
W = given mass
M = molar mass
Given balanced chemical equation for the formation of sodium bicarbonate is:
Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃
From the stoichiometry of the reaction, it is clear that:
1 mole of Na₂CO₃ is required = to form 2 moles of NaHCO₃
Or 1/2 mole of Na₂CO₃ is required = to form 1 moles of NaHCO₃
Moles of NaHCO₃ be calculated by using the above formula as:
n = 1,000g (given) / 84.007g/mole = 11.90 moles
So, moles of Na₂CO₃ required to form 11.90 moles of NaHCO₃ = 11.90×1/2 = 5.95 moles
Now we convert the mole of Na₂CO₃ to grams by using the mole formula:
W = 5.95mole × 105.98g/mole = 630.581 grams.
Hence, 630.581 grams of soda ash would be needed.
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Very long question but PLZ help
20. Calculate the hydrogen-ion concentration [H + ] for the aqueous solution in which [OH – ]
is 1 x 10 –11 mol/L. Is this solution acidic, basic, or neutral? Show your work. (3 points) Use
K w to solve for the hydrogen ion concentration here. Then, once you have your numerical
answer (with units!), answer the question about the solution.
Calculate the hydrogen-ion concentration (show all set up work with calculations) – (2 pts)
Discuss your answer and how it is related to the solution being acidic, basic or neutral and then
identify your solution as acidic, basic or neutral based on your calculated hydrogen-ion
concentration. – (1 pts)
Kw = [H+][OH-]
[OH] = 1.0 x 10^-11 M
Kw = 1.0 x 10^-14
[H+] = Kw/[OH-] = 1.0 x 10^-14 / 1.0 x 10^-11 = 1.0 x 10^-3 M
The solution is acidic, because [H+] > [OH-].
Explain how increasing the pressure of a gas affects rate of reaction.
Find the molar mass of CaCO3
Answer:
molar mass of caco3 is
100.0869 g/ mol
I NEED HELP PLEASE! (Made it worth A LOT of points!!!)
Selina is a scientist and is designing a portable water warmer that can help her warm up her samples while away from the lab. The device will store two chemicals separately. When she wants to warm up water, she will activate the device, which will mix the chemicals together to generate thermal energy. The thermal energy will increase the temperature of a container filled with water. Selina wants to find the best two chemicals that will generate energy in a safe and portable way. She starts by testing copper sulfate solution and zinc metal. She mixes these chemicals together in a beaker and records her observations in the table.
Time Observations
Before Combination: The copper sulfate solution is blue and zinc metal is a dull grey.
During Combination: Zinc Metal becomes dark and large amounts of thermal energy
is released.
After Combination: The Zinc is gone, a reddish-brownish residue remains, and the
solution is clear.
When copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged. How many atoms are there before and after the interaction? Select the correct answer choice.
Before: 5 atoms; after 6 atoms.
Before: 6 atoms; after 6 atoms
Before: 5 atoms; after 5 atoms
Before: 7 atoms; after 7 atoms
Answer:
the third one.
Explanation:
According to law of conservation of mass,before and after the reaction copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged. there are 5 atoms.
What is law of conservation of mass?
According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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6. How is Avogadro’s number used to convert moles into particles?
Explanation:
Avogadro's number is a very important relationship to remember: 1 mole = 6.022×1023 6.022 × 10 23 atoms, molecules, protons, etc. To convert from moles to atoms, multiply the molar amount by Avogadro's number.
ASAPPPPP
how do 2 positive charge move in an electric field
Answer:
yer
Explanation:
What is the net ionic equation for the reaction below?
2H+ + CO32– + 2Na+ + 2OH– 2Na+ + CO32– + 2H2O
Answer:
The given reaction in your problem is the ionic equation for an acid (carbonic acid) reacting with a base (sodium hydroxide). All components of the reaction are then written in ionic form except for reactant weak electrolytes and the driving force product compound of the reaction (H2O). See following explanation.
Explanation:
Metathesis Rxn: molecular equation of rxn
H₂CO₃(aq) + 2NaOH(aq) => Na₂CO₃(aq) + 2H₂O(l)
Ionic Equation: shows all components of the reaction
H₂CO₃(aq) + 2Na⁺(aq) + 2OH⁻(aq) => 2Na⁺(aq) + CO₃²⁻(aq) + 2H₂O(l)
H₂CO₃(aq) wk. electrolyte and H₂O(l) driving force compound are not shown ionized in ionic equation. Only strong electrolytes that ionize 100%; i.e., salts and strong acids and bases.
Net Ionic Equation: shows only the reactive components without the spectator ions (nonreactive components), in this case, the Na⁺(aq) ions.
H₂CO₃(aq) + 2OH⁻(aq) => CO₃²⁻(aq) + 2H₂O(l)
How much water is needed to prepare a .50 molal solution using 0.50 moles of sodium chloride??
The amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
How to calculate volume?The volume of a solution can be calculated using the following formula:
Volume = no of moles ÷ molarity
According to this question, 0.50 molal solution is used to prepare 0.50 moles of sodium chloride. The volume of the solution is calculated as follows:
Volume = 0.50 moles ÷ 0.5M
Volume = 1L
Therefore, the amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
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A sample of gas has an initial volume of 15 L and an initial pressure of 4.5 atm. If the pressure changes to 1.8 atm, what is the new volume, assuming that the temperature remains constant?
Answer:
37.5 L
Explanation:
Initial Volume, V1 = 15L
Initial Pressure P1 = 4.5 atm
Final Pressure, P2 = 1.8 atm
Final Volume V2 = ?
The relationship between these variables is given as;
P1V1 = P2V2
V2 = PIV1 / P1
Inserting the values;
V2 = 4.5 * 15 / 1.8
V2 = 37.5 L
Answer: The new volume is 37.5L
Explanation:
The question is solved using the principle and formula of a gas law known as the Boyle's law. Boyle's law states that provided the temperature remains constant, the volume of a given mass of gas is inversely proportional to its pressure. Expressing the statement mathematically:
P ∝ 1/V, (where p is equal to pressure and V is volume)
Therefore PV = a constant
If a gas at pressure P1 and Volume V1 changes at constant temperature to pressure P2 and volume V2 then:
P1V1 = P2V2.
Using the formula to solve the question:
P1 = 4.5atm
P2 = 1.8atm
V1= 15L
V2 = ?
V2 = P1V1/P2
V2= 4.5 × 15 /1.8
V2 = 67.5/1.8
V2 = 37.5 L
Therefore the new volume is 37.5L
What happens to the sugar that plants make during photosynthesis?
문
F
It is recycled in the soil and through the roots so other consumers
can grow
It is released by the stoma in the leaves and made available to
other consumers
It is used for growth and maintenance of the plant and a small
amount is available to feed consumers.
None of the above
Answer:
glucose
Explanation:
plants use sunlight water and the gases in the air to make glucose which is aform of sugar
What is the concentration of a solution of HBr if 0.40 L is neutralized by 0.20 L of 0.50M solution of LiOH?
Calculate the change in heat (Q) that occurs when 27.58grams of liquid water at 16°C heats to water vapor at 62°C. (cp = 4.184 J/g°C)
Answer:
5308.16J
Explanation:
Using the formula;
Q = m × cp × ∆T
Where;
Q = change in heat (J)
m = mass of substance (g)
cp = specific heat capacity (4.184 J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
Q = ?
m = 27.58 grams
cp = 4.184 J/g°C
∆T = 62°C - 16°C = 46°C
Using Q = m × cp × ∆T
Q = 27.58 × 4.184 × 46
Q = 5308.157
Q = 5308.16J
write any 2 uses of fractionate distillation
Answer:
Fractional Distillation could be used to:
Obtain the different fractions of a crude which may have more uses and be more useful.Obtain ethanol from a mixture of ethanol and water.Fractional Distillation is used to obtain one substance from a mixture. It depends on the boiling points of the substances.
Which of these results in kinetic energy of an object? position mchotion
Answer:
..... yep
Explanation:
tep no yep no hyshshshss
motion results in the kinetic energy of an object
What is the molarity of a solution containing 29g of NaCl in 1L solution?
Answer:
hope this helps
Explanation:
1M NaCl solution is 58.5 g/1000 ml , where molecular wt of NaCl being 58.5 grams , so 29.2 g of NaCl in 1000 ml of water will be equal to : 29.2g /58.5g = 0.499145299 M , so 29.2 g NaCl dissolved in 100 ml would correspond to , 0.499145299 M X 1000 ml/100 ml = 4.99145 M or about 4.99 M
Name the type of equation then balance. Sn,(PO2)2 + Fe(CIO): - Sn(CIO3)2 + FePO,
Answer:
ionic compond
Explanation:
Sn(ClO3)4
Which of the following describes fertilization?
Answer: Fertilization defintion
Explanation:
the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote.
Or giving rise to new indivisual organisms or offspring and initiating development
the symbol for the element in period 2, group 13
When a solid suddenly appears when two substances are mixed, and it settles to the bottom, collects on another object, or makes a solution loudy, that solid is known as a _____. pls help ASAP!
Answer:
Precipitates Form
Explanation:
I apologize if I am wrong
Give six examples of complex compounds.
Answer:
Examples of complex compound include potassium ferrocyanide K4[Fe(CN)6] and potassium ferricyanide K3[Fe(CN)6]. Other examples include pentaamine chloro cobalt(III) chloride [Co(NH)5Cl]Cl2 and dichlorobis platinum(IV) nitrate [Pt(en)2Cl2](NO3)2.
How is the periodic table organised?
The periodic table brings order to information about the chemical elements. The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties.
ASAP
The directions "shake well before using" are listed on special types of heterogeneous mixtures called
A- Solutions
B- Suspensions
I am currently learning this and I would say Suspensions!
Hope this helps :)
is sugar an element or a molecure or a molecure and a compound?
Answer:
Compound
Explanation:
Table sugar, or sucrose, is a compound because it's formed when two or more elements are joined together. Its chemical formula is C12H22O11, and it contains carbon, hydrogen and oxygen.