Answer:
Si₁₄ = 1s² 2s² 2p⁶ 3s² 3p²
Explanation:
Silicon is present in group 14 of periodic table.
It is blue-gray color metalloid.
Its atomic mass is 28 g/mol.
It is mostly used to make allow.
The most important alloy are Al-Si and Fe-Si. These are used to make different machine tools, transformer plates, engine etc.
Its atomic number is 14 and electronic configuration can be written as,
Electronic configuration:
Si₁₄ = 1s² 2s² 2p⁶ 3s² 3p²
The noble gas electronic configuration or abbreviated electronic configuration can also be written.
Si₁₄ = [Ne] 3s² 3p²
The atomic number of neon is 10. Its electronic configuration is,
Ne₁₀ = 1s² 2s² 2p⁶
That's why we write [Ne] for 1s² 2s² 2p⁶ in abbreviated electronic configuration of Si.
What is the vapor pressure in kPa and atm of ethanoic acid at 120C?
Answer:
Explanation : Ethanoic acid has the lowest vapor pressure i.e 0.08 atm at the temperature of 50°C compared to the other given options
Explanation:
A sample of a gas at 15 C and 1 atm has a volume of 2.58 L. What volume will this gas occupy at 38 C and 1 atm? (HINT: Pressure is constant)
Answer value
Answer:
V2 = 2.79
Explanation:
T1 = 15C = 288.15K
P1 = 1 atm
V1 = 2.58L
T2 = 38C = 311.15K
P2 = 1 atm
V2 = ?
P1V1/T1 = P2V2/T2 must be changed to T2P1V1/T1/P2
311.15 x 1 x 2.58 ÷ 288.15 ÷ 1 = V2
V2 = 2.79 L
So 2.79 L is the answer!!
A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh? a. 73.30 g b. 274.49 g c. 640.51 g d. 1,626.89 g
Answer:
c. 640.51
Explanation:
Given: 2.54 cm = 1 inch weighed 3.88 ounces
1 g = 0.035273 ounces
? = 3.88 ounces
? = (3.88 x 1) / 0.035273
? = 109.999 = 110 g
110 g = 3.88 ounces
2.54 cm = 110 g
14.79 cm = ?
? = (14.79 x 110) / 2.54
? = 640.51 g
According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.
What is unit conversion?Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces
x = 3.88 ounces
x= (3.88 x 1) / 0.035273
x = 109.999 = 110 g
110 g = 3.88 ounces
Thus,2.54 cm = 110 g
14.79 cm = x
x= (14.79 x 110) / 2.54
x = 640.51 g
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9. Which mass measurement contains a total of three
significant figures?
A) 22.0 g
C) 220 g
B) 22.00 g
D) 2200 g
Answer:
A
Explanation:
2 has 4, 3 and 4 both have 2.
(if 3 had a decimal point it would have 3 sig figs)
The mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.
What is mass?Mass is defined as the inertia, a fundamental feature of all stuff, is quantified.
It is also defined as a dimensionless quantity that represents the mass of a particle or object.
Mass can be expressed as
Mass = density x volume
Significant figure is defined as a number in positional notation is a set of digits that may be relied on to signify the quantity of anything.
It can also be defined as the amount of significant single digits from 0 to 9 in the coefficient of the expression that accurately conveys the meaning.
Thus, the mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.
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Will a non-metal replace a metal?
Answer:
In displacement reactions
Explanation:
Question 2 of 19
The graph below shows how the temperature and volume of a gas vary when
the number of moles and the pressure of the gas are held constant. What
happens to the temperature of a gas as its volume increases?
T
A. The temperature doubles.
B. The temperature decreases.
C. The temperature remains the same.
D. The temperature increases.
PREVIOUS
Answer:
D
Explanation:
The temperature increases
What is the net ionic equation for potassium fluoride and ammonium chloride
The net ionic equation for potassium fluoride and ammonium chloride is
NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)
What is the net ionic equation for potassium fluoride and ammonium chloride?Generally, The net ionic equation can simply be defined as a chemical equation that records solely those species experiencing the reaction.
Therefore, net ionic equation for potassium fluoride and ammonium chloride
NH_4Cl(aq) and KF(aq) are both salys
Therefore, the ionic equation excludes them and is
NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)
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How many grams of potassium chloride is produced with 2.5g of pure potassium
(K) react with chlorine gas? How many grams if you started with 1g of chlorine
gas?
Answer:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Explanation:
big brain ;)
How many moles are in 250 grams of Xenon?
Answer:
[tex]1.90[/tex] [tex]moles[/tex]
What is the number of moles of atoms in 9.03 x 10 24 atoms?
Answer:
15
Explanation:
c. What is the heat of reaction for the process described in (a)? Hint: Apply Hess's law using the data in (b)
During a chemical reaction, the quantity of heat can only be added or removed in aim to maintain all of the components involved at almost the same temperature. It can be described by Hess's law.
What is Hess's Law?The total enthalpy change for a reaction is the sum of all changes, according to Hess's Law of Constant Heat Summation. The fact that enthalpy is just a state function is demonstrated by this law.
Hess's law can be expressed as:
Δ[tex]H_{reaction}[/tex] = ∑nΔ[tex]H_{product}[/tex] - ∑nΔ[tex]H_{reactant}[/tex].
where, n indicates stoichiometric coefficients, ΔH indicates enthalpy of reaction( reactant and product)
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Answer: 176.18 kJ/mol
Explanation:
Identify the correct statement regarding the strength of chemical bonds.
1. Strong bonds occur with high temperature and weak bonds with low temperature.
2. If the bond energy between atoms is very weak then the bond between the atoms is strong.
3. Strong bonds form with large atoms and weak balunds with small atoms.
4. If the bond energy between atoms is very high then the bond between the atoms is strong.
Answer:
4
Explanation:
bond energy which is high means that a bond is strong and the molecule containing that bond is less reactive.
The three-carbon structure that forms the backbone of a triglyceride is called.
Glycerol is the three-carbon backbone of triglycerides, while fatty acids are longer chains of carbon molecules attached to the glycerol backbone.
Two blocks of platinum have a temperature of 200 Celsius one block has a mass of 10g the other block has a mass of 100g do the blocks have the same amount of thermal energy?
Two blocks of platinum have a temperature of 200 Celsius. Both the blocks have the same amount of thermal energy because both are metals which conducts heat energy throughout their bodies.
What is conduction?Conduction is the process by which heat energy is transmitted between neighboring atoms or molecules. We know that metals are the good conductors of heat and electricity so if one part absorb heat, it will spread to the whole body so we can conclude that the thermal energy will remain the same amount throughout the whole body.
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name the two products formed when hydrocarbons burn in oxygen
Answer:
carbon dioxide nd water
Explanation:
mark brainliest
(c) Write a chemical equation for the reaction between sodium and fluorine.
The chemical reaction will be NaF
Answer:
2Na + F_2
Here Sodium is taken in solid form and Fluorine is taken as gaseus
Iday!' Read the following phrases from the article. 1. Full-scale war 2. Braces for a full invasion 3. Hostile act 4. Defenses on its eastern flank Why does the author use these words?
a. To call attention to Vladimir Putin's objective with the attack on Ukraine
b. To highlight the offensive steps taken by the Russian military
c to emphasize the heightened degree of military engagement
d. To document President Zelenskyy's aggressive approach to defending his country
Answer:
c.
Explanation:
Which type of bond will form between two chlorine atoms?
an ionic bond
a metallic bond
a polar covalent bond
a nonpolar covalent bond
Answer:
D. a nonpolar covalent bond
Answer:
D a nonpolar covalent bond
Explanation:
edge 2020
(05. 04 MC)
The following reaction shows sodium hydroxide reacting with sulfuric acid.
NaOH + H2SO4 → Na2SO4 + H2O
How many grams of Na2SO4 are produced from 10. 0 grams of NaOH?
(Molar mass of Na = 22. 989 g/mol, O = 15. 999 g/mol, H = 1. 008 g/mol, S = 32. 065 g/mol) (4 points)
a
17. 8 grams
b
19. 2 grams
c
35. 5 grams
d
38. 5 grams
will mark brainliest
Answer:
17.8 grams
Explanation:
The mass of Na₂SO₄ produced is 35.5g
What is a mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of NaOH = 10 g
Molar mass of NaOH = 23 + 16 + 1 = 40
Molar mass of NaSO = (23 × 2) + 32 + (4 × 16) = 142
Moles = mass ÷ molar mass
moles of NaOH = 10 ÷ 40
= 0.25
From the reaction, 1 mole of NaOH gives 1 mole of Na₂SO₄.
Thus, 0.25 moles of NaOH gives 0.25 moles of Na₂SO₄.
Mass of Na₂SO₄. = 0.25 × 142
=35.5g
Therefore, the mass of Na₂SO₄ produced is 35.5g
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Why do some substances float on water?
they are less dense
than water
they are warmer
than water
they are more
dense than water
The two basic properties of all matter are ______ and ______.
options for first blank
a. length B. volume
options for second blank
a. density B. mass
Answer:A-density and B-mass is the answer.
Explanation:
Answer:
1.) Density
2.) Mass
Explanation:
PLEASE ANSWER!!! TIME LIMITED!!! What are 2 ways electric motors and electric generators are alike?
A. They each transform mechanical energy into electrical energy.
B. They each use an electromagnet.
C. They each include an electrical circuit.
D. They each use a battery as their main power source.
Answer:b
Explanation:
Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
Answer:
A
and B
Explanation: hope this helps, pls mark brainliest.
PLEASE HELP! I will give brainliest!
4. You have knowledge of the outermost electron states of the atoms, trends in the periodic table, and the patterns of chemical properties. Use that knowledge to predict the products of each of the following equations. Then explain how you made your predictions. Be sure to balance the equations. (4 points)
a. ___NaBr + ___Ca → _______ + _______
b. ___Mg + ___O2 → _______
The reactions are completed as folows;
2NaBr + Ca -----> CaBr2 + Na
2Mg + O2 ----> 2MgO
What is the electrochemical series?The electrochemical series has to do with the arrangement of atoms in order of reactivity. The metals that are up in the series are more reactive than the metals that are below.
In this case, the reactions are completed as folows;
2NaBr + Ca -----> CaBr2 + Na
2Mg + O2 ----> 2MgO
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Propane, C3H8, is a liquid in a pressurized barbecue tank but vaporizes instantly as it
flows out of the tank. Calculate the mass of propane that would vaporize as a result
of absorbing 100.0 kJ of energy. The molar enthalpy of vaporization of propane is
15.7 kJ/mol.
The mass of propane, C₃H₈ that will vaporise as a result of absorbing 100 KJ of energy is 280.25 g
Data obtained from the question Molar enthalpy of vaporization of propane = 15.7 KJ/molEnergy = 100 KJ Mass of propane =? How to determine the mass of propane1 mole of propane C₃H₈ = (3×12) + (1×8) = 44 g
From the question given above,
15.7 KJ of heat energy vaporised 44 g of propane.
Therefore,
100 KJ of heat energy will vaporise = (100 × 44) / 15.7 = 280.25 g of propane
Thus, 280.25 g of propane were vaporised from the tank.
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PLS HURRYThe moon does not light up by itself. Instead, it reflects light from the sun. Question 10 options: True False
Answer:
awnser is true took the test
Explanation:
i took the test
Chapter 3 Question: What was produced during the reaction between the iron pipes and the fertilizer?
Claim 1: During the chemical reaction, only the rust was produced.
Claim 2: During the chemical reaction, the rust and another substance were produced.
write an argument and Explain to the people of Westfield what is in their water.
Claim 2 is correct as during the chemical reaction, the rust and another substance were produced.
What is a Chemical reaction?This is defined as two or more substances being converted to new substances known as products.
The reaction between iron pipes and the fertilizer will lead to the formation of products such as rust and another substance. The people of Westfield may likely have compounds such as Sodium nitrite in their water.
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Which would be the best way to represent the concentration of a 1.75 m k2cro4 solution? 1.75% k2cro4 [k2cro4] (k2cro4) k2cro4, [m] = 1.75
The best way to represent the concentration of a 1.75 m K₂CrO₄ solution is [K₂CrO₄] = 1.75M.
What is concentration?Concentration of any substance will give idea about the quantity of that substance present in given volume.
Concentration will be express in many ways like molarity, molality, mole fraction and so on. And to express the quantity in concentration we will use the big square closed bracket like this [ ].
Hence, best way is [K₂CrO₄] = 1.75M.
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Answer:
B.
Explanation:
Choose all the answers that apply
The boiling point of water is ___
A. 100°C
B. 100°F
C. 212°C
D. 212°F
PLEASE HURRY I NEED THE ANSWER FAST
Answer:
a and d but were in America so d
Helppppppppppppppppppppppppppppppppppppppppppp
what is ammonia Conductivity in Solution?
a. Light bulb shines brightly
b. Light bulb shines dimly
c. Light bulb shines doesn't shine
and explain why you chose that answer
Answer:
B.
Explanation:
An ammonia solution contains only a few ions, and it conducts electricity only poorly.
A State of Matter with No fixed Shape and
No fixed Volume