Answer:
[tex]\boxed {\boxed {\sf D. \ Sodium}}[/tex]
Explanation:
Valence electrons are electrons in the outermost shell.
One way to find valence electrons is with the electron configuration. This is often found on the Periodic Table. The last number in this configuration is the number of valence electrons, because an electron configuration shows where electrons are located and the last number represents the outer shell.
Chlorine: 2-8-7 (7 valence electrons)Calcium: 2-8-8-2 (2 valence electrons)Boron: 2-3 (3 valence electrons)Sodium: 2-8-1 (1 valence electron)In addition, all group 1 or alkali metals have 1 valence electrons. These include lithium, sodium, potassium, rubidium, cesium, and francium.
Even though we already know it is sodium based on valence electrons, here is an explanation of the reaction ratio.
Since sodium has 1 valence electron, it wants to get rid of it to satisfy the Octet Rule (8 valence electrons). Group 17 elements have 7 valence electrons, so they need 1. The two elements will react in a 1 to 1 ratio because the sodium donates its 1 excess electron to the group 17 element that needs 1.
The element that has 1 valence electron in its outer shell and will react with a group 17 element in a 1:1 ratio is sodium. Therefore, the correct option is option D.
The electrons in an atom's highest energy level, commonly referred to as the valence shell, are called valence electrons. These electrons interact with other atoms and participate in chemical bonds. Alkali metal sodium (Na), which belongs to group 1 of the periodic table, contains one valence electron in its outermost shell. Halogens, or group 17 elements, have 7 valence electrons.
Chlorine (Cl) is a member of group 17 and combines with sodium to generate sodium chloride (NaCl), an ionic compound. One sodium atom contributes its one valence electron to a chlorine atom, creating a stable ionic connection.
Therefore, the correct option is option D.
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who will go out with me
Answer:
i want to see a pic but if you got nice toes all give you my number
Explanation:
Answer:
nah Im good
Explanation:
single forever
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Que nombre recibe la división del sistema nervioso que se encarga de la acciones y los procesos involuntarios del cuerpo
Answer:
Sistema Nervioso Autónomo
Explanation:
El Sistema Nervioso es el encargado de enviar señales (impulsos nerviosos en su mayoría) a órganos y partes del cuerpo, para que ejerzan su función. En general, se compone de 3 divisiones o subsistemas:
Sistema Nervioso Central (cerebro y encéfalo)Sistema Nervioso Perisférico (nervios y ganglios)Sistema Nervioso Autónomo (impulsos involuntarios)De éstos, el encargado de acciones y procesos involuntarios es el Sistema Nervioso Autónomo (SNA), que a su vez se divide en simpático y parasimpático. El SNA se encarga de los movimientos involuntarios de órganos, como el corazón, el sistema digestivo, etc., y de regular procesos como la secreción de hormonas y la regulación de la temperatura corporal.
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Can someone please help me with this???
A gas occupies 650.mL at STP. How many moles of gas are in the container?
Please help ((((
Explanation:
describe this guy standing
How many atoms are in an oxygen molecule?
Answer:
two atoms
Explanation:
In its stable molecular form, oxygen exists as two atoms and is written O2. to distinguish it from an atom of oxygen O, or ozone, a molecule of three oxygen atoms, O3. Even though each of these is all oxygen, combining atoms of the same element may give very different properties to the molecule.
1) For the equation in the picture, write down the molecular formula for each of the following species in the reaction:
a) Acid
b) Base
c) Conjugate Acid
d) Conjugate Base
2) In your own words, what is a Bronsted-Lowry Acid?
Answer:
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i hate chemistry but someone help please, no links or you’ll be reported
Answer:
A, D, E
Explanation:
A gas occupies a volume of 500. Milliliters at a pressure of 38.0 kPa and a temperature of 298 K. At what temperature will the gas occupy a volume of 250. Milliliters and have a pressure of 76.0 kPa?
Answer:
A gas occupies a volume of 250 mL at a pressure of 76 kPa and a temperature of 298 K.
Explanation:
Charles's law states that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. This mathematical law expresses that the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Gay-Lussac's law says that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law mathematically says that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T} =k[/tex]
Finally, Boyle's law says that the volume occupied by a certain gaseous mass at constant temperature is inversely proportional to the pressure. This law is expressed mathematically as
P * V = k
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 38 kPaV1= 500 mLT1= 298 KP2= 76 kPaV2= 250 mLT2= ?Replacing:
[tex]\frac{38 kPa*500 mL}{298 K} =\frac{76 kPa*250 mL}{T2}[/tex]
Solving:
[tex]T2*\frac{38 kPa*500 mL}{298 K} =76 kPa*250 mL[/tex]
[tex]T2=\frac{76 kPa*250 mL*298 K}{38 kPa*500 mL}[/tex]
T2= 298 K
A gas occupies a volume of 250 mL at a pressure of 76 kPa and a temperature of 298 K.
A process used to gain knowledge through observation and investigation is?
science
math
physics
energy
matter
Answer:matter
Explanation:
matter
make brain
What kind of intermolecular forces between an ammonia molecule and a water molecule? Note: there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force
Answer:
hydrogen bonding
Explanation:
Dipole-Dipole, Dispersion, hydrogen bonding and ion bond
1. Make a claim that answers the following question: "What is the
connection between the number of valence electrons and
chemical/physical properties?" *
Lets take an example to explain this
Sodium(Na) has 1 electron in its outer or valence shell hence it will lose it and become a cation say to Chlorine(Cl)
To form Sodium Chloride.
Since it is capable of losing electrons, Sodium becoems a metal and has properties of metal
Whereas Chlorine which has 7 electrons in its valence shell gains an electrons to become an anion
Hence it is a non metal
And has the properties of an anion
I don't know how to get the volume and it is 10 point removed for it wrong so can someone help me
Question 1 of 10
Which of these is an advantage of wind energy?
A. It increases greenhouse gas emissions,
B. It generates noise pollution,
c. It generates electricity
0
D. It reduces bird and bat populations.
How many joules are required to melt 80 grams of ice to water at 0 C?
Explanation:
Its value is 6.02 kj/mol. This means for every mole of ice we melt we must apply 6.02 kj of heat. We can calculate the heat needed with the following equation:
q
=
n
×
Δ
H
where:
q
= heat
n
= moles
Δ
H
= enthalpy
In this problem we would like to calculate the heat needed to melt 35 grams of ice at 0 °C. This problem can be broken into three steps:
1. Calculate moles of water
2. multiply by the enthalpy of fusion
3. Convert kJ to J
Step 1: Calculating moles of water
35
g
×
(
1
m
o
l
18.02
g
)
=
1.94
m
o
l
s
Step 2: Multiply by enthalpy of fusion
q
=
n
×
Δ
H
=
1.94
×
6.02
=
11.678
k
J
Step 3: Convert kJ to J
11.678
k
J
×
(
1000
J
1
k
J
)
=
11
,
678
J
Finally rounding to 2 sig figs (since 34°C has two sig figs) we get
q
=
12
,
000
J
One last note, if the temperature were not 0 °C then the ice would have to be heated in addition to melted. This would be a phase change problem combined with a heat capacity problem.
For the reaction of C 2H 4( g) with O 2( g), to form CO 2( g) and H 2O( g), what number of grams of CO 2 could be produced from 2.0 g of C 2H 4 and 5.0 g of O 2?
Answer:
4.58g of CO₂ could be produced
Explanation:
Based on the reaction:
C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g)
1 mole of C₂H₄ reacts with 3 moles of oxygen to produce 2 moles of CO₂
To solve this question we must find the moles of each reactant in order to find limiting reactant. With limiting reactant we can find the moles -And the mass- of CO₂ produced:
Moles C₂H₄ -Molar mass: 28.05g/mol-
2.0g * (1mol / 28.05g) = 0.0713moles
Moles O₂ -Molar mass: 32g/mol-
5.0g * (1mol / 32g) = 0.156moles
For a complete reaction of 0.0713 moles of C2H4 are required:
0.0713 moles C₂H₄ * (3 moles O₂ / 1 mol C₂H₄) = 0.214 moles of O₂
As there are just 0.156 moles, O₂ is limiting reactant.
The moles of CO₂ produced are:
0.156 moles O₂ * (2mol CO₂ / 3mol O₂) = 0.104 moles CO₂
The mass is -Molar mass CO₂: 44.01g/mol-
0.104 moles CO₂ * (44.01g / mol) =
4.58g of CO₂ could be produced11. A 30-kg box is 0.2 m long and 0.15 m wide. What pressure does it exert on the floor?
Answer:
P = 9800 Pa
Explanation:
Given that,
The mass of a box, m = 30 kg
Length of the box, l = 0.2 m
The width of a box, b = 0.15 m
We need to find the pressure it exerted on the floor. Pressure is equal to force acting per unit area. So,
[tex]P=\dfrac{F}{A}\\\\=\dfrac{mg}{lb}\\\\=\dfrac{30\times 9.8}{0.2\times 0.15}\\\\P=9800\ Pa[/tex]
So, 9800 Pa of pressure is exerted on the floor.
Anyone do this worksheet? Answers?
Answer:
1. Moles of oxygen required to react with 5 moles of C₈H₁₈ = = 62.5 moles of oxygen
2. Mass of oxygen required = 2000 g of oxygen
3. Moles of CO₂ that will be produced = 40 moles of CO₂
4. Mass of CO₂ that will be produced = 1760 g of CO₂
5. Moles of H₂O that will be produced = 45 moles of H₂O
Explanation:
Balanced equation of the reaction : 2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O
1. Mole ratio of Oxygen and C₈H₁₈ = 25 : 2
Moles of oxygen required to react with 5 moles of C₈H₁₈ = 5 × 25/2 moles
Moles of oxygen required to react with 5 moles of C₈H₁₈ = = 62.5 moles of oxygen
2. Mass of oxygen required = number of moles of oxygen × molar mass of oxygen
Molar mass of oxygen = 32.0 g/mol
Mass of oxygen required = 62.5 moles × 32.0 g/mol
Mass of oxygen required = 2000 g of oxygen
3. Mole ratio of CO₂ and C₈H₁₈ = 16 : 2
Moles of CO₂ that will be produced = 5 × 16/2 moles
Moles of CO₂ that will be produced = 40 moles of CO₂
4. Mass of CO₂ that will be produced = number of moles of CO₂ × molar mass of CO₂
Molar mass of CO₂ = 44.0 g/mol
Mass of CO₂ that will be produced = 40 moles × 44 g/mol
Mass of CO₂ that will be produced = 1760 g of CO₂
5. Mole ratio of H₂O and C₈H₁₈ = 18 : 2
Moles of H₂O that will be produced = 5 × 18/2 moles of H₂O
Moles of H₂O that will be produced = 45 moles of H₂O
When solid water changes directly to water vapor without first becoming a liquid, the process is called?
Sublimation. Sublimation is the change of a solid direct to gas or vapour without becoming liquid
What is the total volume that you have if you calculated that it weighs 180g?
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In which period is an element that has the electron configuration 152 252
2p6 352 3p6 3d10 452 4p1 ? *
Period 4
Period 1
Period 2
Period 3
Answer:
Period 4
Explanation:
Given the electronic configuration of the element;
= Is² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹
The period of the element is determined by the highest coefficient in the electronic configuration.
For this given configuration (Is² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹), "4" is the highest coefficient and the element will certainly belong to period 4 in the periodic table.
To test if the prediction is correct:
Total number of electrons in the given element = 2+2+6+2+6+10+2+1 = 31
The element with atomic number of 31 = Gallium (Ga). (This element belong to period 4).
Which change happens when a fan is turned on?
A. Electrical energy is changed into light energy
B. Heat energy is changed into mechanical energy
C. Mechanical energy is changed into sound energy
D. Electrical energy is changed into mechanical energy
Answer:
D. Electrical energy is changed into mechanical energy
Explanation:
When you turn on the fan, the electricity that is given through the power outlet allows the fan to have the available energy to spins the fan blades. By the fan's blades spinning, this is a movement that can be described as mechanical energy.
A 1.0 liter flask contains 90.1 moles of water vapor at 27.0 oC. What is the pressure of the gas?
Answer:
The pressure of the gas is 224839.8 atm
Explanation:
As we know
PV = nRT
Substituting the given values, we get -
P * 1 L = 90.1 moles * 8.314 4621(75). J K−1 mol−1 * 300
P = 224839.8 atm
The pressure of the gas is 224839.8 atm
how many electrons does each cl atom gain?
Answer: 18
Explanation:hope this help
How do I solve this?
Answer:
The heat contained is 1236 Joules
Explanation:
As we know
[tex]Q = mc\Delta[/tex]T
Where
[tex]\Delta[/tex]T is the change in temperature
m is the mass in grams
c is the specific heat of water (ice) = 2.06 joules/gram
Substituting the given values, we get -
[tex]Q = 20 * (-15+45)*2.06\\Q = 20*2.06*30\\Q = 1236[/tex]Joules
A sample of aluminum has a density of 2.7g/cm3. the mass of the aluminum is 11g. what would be the volume of the aluminum sample?
A sample of aluminum has a density of 2.7g/cm³. The mass of the aluminum is 11g. What would be the volume of the aluminum sample ?
Answer:-Given:-Density of a sample of aluminium is 2.7g/cm³.
The mass of the aluminium is 11g.
To Find:-The volume of the aluminium sample.
Solution:-We know,
[tex] { \boxed{\bf{\rm \red {Volume \: = \frac{Mass}{Density}}}}} [/tex]
So, [tex] \bf Volume \: = \frac{11}{2.7} [/tex]
[tex] \bf Volume \: = \: 4.07 \: cm³ [/tex]The volume of the aluminium sample is 4.07 cm³. [Answer]If I plant a green bean seed in the desert, will it grow thick, barrel-shaped stems full of water like a cactus? Why or why not?
Answer:
No, although the bean crop can grow perfectly in full sun or a little shade in very warm places. It does not mean that they will adopt the growth patterns of the cactus, especially because this plant needs constant watering (in small quantities), very constant. Beans require good drainage for their growth.
Each vegetation have its own characteristics and the power of adaptation. A green bean cannot survive in a desert like a cactus in desert without water. It can only grow thick in soil with proper water content and nutrients.
What is cactus?Cactus is a type of plant grow in dry regions such as deserts. It can adapt in deserts without water for long time because, the plant have enough water storage in its stem.
Domestic vegetation such as bean, pea, nuts etc ill not grow in dry regions because they cannot adapt in deserts without water. The soil in deserts is dry and have no nutrients.
These conditions prevent the growth of vegetables in desert areas. Moreover, desert have summer season only. The extreme temperature over there will cause the normal plants to diminish.
Therefore, planting green bean in deserts will not make it grow thick like a cactus plant.
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5. The number of atoms in 9.2 g of Na will be: A. 6.2 x 1023 atoms B. 2.408 x 1023 atoms C. 9.2 x1023 atoms D. 23 atoms E. 9.2 atoms
Answer:
The answer is "Option B"
Explanation:
Formula:
Na atoms= Na atoms moles \times NA
[tex]= \frac{mass}{Na \ Molar\ mass} \times 6.022 \times 10^{23}\\\\= \frac{9.2}{23} \times 6.022 \times 10^{23}\\\\=0.2875 \times 6.022 \times 10^{23}\\\\=2.4 \times 10^{23}\ atoms \\\\[/tex]
If the scientist measured the mass of the copper cube after it had been in the furnace for one hour what would the cube’s mass probably be? Explain your answer