PLEASE Answer asap! Compare two periodic families below. You must include at least two facts about each family. You may use any description of properties or periodic trends to help you.
Answer:
The alkali metals/group 1 are recognized as a group and family of elements. These elements are metals. Sodium and potassium are examples of elements in this family. Hydrogen is not considered an alkali metal because the gas does not exhibit the typical properties of the group. The largest family of elements consists of transition metals/group 3-12/group 3a. The center of the periodic table contains the transition metals, plus the two rows below the body of the table (lanthanides and actinides) are special transition metals. Even though both are metals, transition metals have higher melting points; they have higher density; they are less reactive with water; they react and form ions with different charges, but Group 1 metals only form 1+ ions. (Hope the is helpful! You can reword it if you want...)(same answer from the other same question you posted)
Objects A and B are brought close to each other. Object A will soon become positively charged. Identify the charge that much transfer for this situation to occur.
Answer:
a
Explanation:
a solution is prepared by dissolving 55g of CaCl2 into 300g of water. if the Kf of water is -1.86 c/m, shat is the freezing point depression of the solution
Answer:
Relation between , molality and temperature is as follows.
T =
It is also known as depression between freezing point where, i is the Van't Hoff factor.
Let us assume that there is 100% dissociation. Hence, the value of i for these given species will be as follows.
i for = 3
i for glucose = 1
i for NaCl = 2
Depression in freezing point will have a negative sign. Therefore, d
depression in freezing point for the given species is as follows.
=
=
=
Therefore, we can conclude that given species are arranged according to their freezing point depression with the least depression first as follows.
Glucose < NaCl <
Explanation:
26. What are two water cycle processes not represented by arrows in this cross section?
1) transpiration and condensation 3) precipitation and freezing
2) evaporation and melting
4) runoff and infiltration
Answer:
4)
Explanation:
7. Which word BEST describes symbiosis?
O A. ecosystem
O B. relationship
O C. living
OD. environment
Answer:
d.
Explanation:
po ata d ako sure sorry
How many moles are in 30.1 grams of O ? Watch your significant figures.
et
1.88 moles O
1.9 moles O
1.88 g O
2.00 g O
Answer:
1 mole of O contains 16g
x mole of O will contains 30.1 g
= 16x = 30.1
16x/16= 30.1/16
= 1.88 mole of O
the answer is 1.88 mole of O
Earth is currently 150 million km away from the Sun. If Earth was 200 million km away from the Sun, why would it no longer be able to support life?
Answer:
The temperature would be too cold
Explanation:
please help on this question it’s the only one i can’t do !!
Answer:
70%of 2000 = 1400
2000 tonnes of hematite contains 1400 tonnes iron oxide .
1400 tonnes of fe2O3
fe2O3 have molar mass 159.69
calculate moles = given mass/molar mass
moles = 1400000000/159.69
moles = 8766986
one mole contains = 112 g of fe
so 8766986 moles will contain = 112×8766986
= 981,902,432 grams of ferrous
which is nothing but equal to 981.90 tonnes of iron!!
Convert 3.00 * 10 ^ 26 molecules of carbon dioxide gas at STP to L.
1.What is the coefficient of the scientific notation answer? 2.What is the exponent of the scientific notation answer? 3.How many significant figures are there in the answer ?
4.What is the right most significant figure in the answer?
Answer: 1. The coefficient is 1.12
2. The exponent is 4
3. There are 3 significant digits
4. The rightmost significant figure is 2.
Explanation:
Scientific notation is defined as the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.
For example : 5000 is written as [tex]5.0\times 10^3[/tex]
According to avogadro's law, 1 mole of every gas contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles and occupy 22.4 L at STP.
[tex]6.023\times 10^{23}[/tex] molecules of [tex]CO_2[/tex] occupy = 22.4 L at STP.
Thus [tex]3.00\times 10^{26}[/tex] molecules of [tex]CO_2[/tex] occupy = [tex]\frac{22.4}{6.023\times 10^{23}}\times 3.00\times 10^{26}=11.2\times 10^3 L[/tex] at STP.
Scientific notation = [tex]1.12\times 10^4L[/tex]
The coefficient is 1.12
The exponent is 4
There are 3 significant digits
The rightmost significant figure is 2.
PLEASE HELP ME ASAP!!!!!!! NO LINKSSSS
Answer: C
Explanation: everything else seems like it is obeying the laws of gravity except wind blowing sand into the air. hope this helps.
A gas at a temperature of 300 K occupies a 5 L flexible container at a pressure of 150 kPa. What volume will it occupy at STP?
6.73 L
This one requires the combined gas law.
P1V1/T1 = P2V2/T2
P1 = 150 kPa = 1.48 atm
V1 = 5 L
T1 = 300 K
P2 = 1 atm
V2 = This is what we’re solving for.
T2 = 273 K
P2 and T2 are based on the conditions of STP. I also changed P1 to atm to keep the units consistent.
Solve the equation for V2:
V2 = P1V1T2 / T1P2
V2 = (1.48 atm)(5 L)(273 K) / (300 K)(1 atm) = 6.73 L
Smoking cigarettes is a lifestyle choice that may lead to cardiovascular disease.
Some people who have never smoked cigarettes still have cardiovascular disease.
Give two other factors that may contribute to the occurrence of cardiovascular
disease.
Answer:
High blood pressure. High blood pressure (hypertension) is one of the most important risk factors for CVD.
High cholesterol - High-fat diet.
If 3.25 mol of Ar occupies 100. L at a particular temp and pressure, what volume does
14.15 mol of Ar occupy under same condition?
Answer:
435.38 L
Explanation:
From the question,
Applying ideal gas equation,
PV = nRT................... Equation 1
Where P = Pressure, V = Volume, n = number of moles, R = molar gas constant, T = Temperature.
Since Temperature and Pressure were constant,
V ∝ n
V/n = V'/n'.................... Equation 2
Where V and V' = the initial and final Volume of Ar respectively, n and n' = the initial and final moles of Ar respectively
make V' the subject of the equation
V' = Vn'/n............... Equation 3
Given: V = 100 L, n = 3.25 mol, n' = 14.15
Substitute into equation 3
V' = (100×14.14)/3.25
V' = 435.38 L
4.15 mole of Ar gas occupy the volume of 435.38 L under same condition.
What is ideal gas equation?
Ideal gas equation for any gas at standard condition is define as:
PV = nRT, where
P = Pressure,
V = Volume,
n = number of moles,
R = molar gas constant,
T = Temperature.
In the question it is given that pressure and temperature for the expansion is constant, so ideal gas equation becomes:
V/n = V'/n', where
V = initial volume of Ar = 100 L (given)
V' = final Volume of Ar = to find?
n = initial moles of Ar = 3.25 mole (given)
n' = final moles of Ar = 14.15 mole (given)
Now we calculate the final volume as:
V' = (100×14.14)/3.25 = 435.38 L
Hence, 435.38 L is the occupied volume.
To know more about ideal gas equation, visit the below link:
https://brainly.com/question/20348074
1. What are the differences between lonic and covalent bonds?
Answer: Ionic bonds result from transfer of electrons, whereas covalent bonds are formed by sharing. ... Ionic bonds are electrostatic in nature, resulting from that attraction of positive and negative ions that result from the electron transfer process; charge separation between covalently bonded atoms is less extreme.
Explanation:
the volume of 5.00 M KBr needed to have 1.00 mol KBr mL
Answer: molarity = mole solute/ liter of solution.
=> volume= mole/molarity = 1/5 = 0.2 L = 200mL
Explanation:
PLSSSS ANSWERRRRRR?????
Answer correctly and dont bother coming to this question if you have the wrong answer.
Answer:
it's b or d I am not 100% sure witch one tho
Answer:
B.
Explanation:
It is B because it says which is an example of A PHYSICAL MODEL. B is a physical model becuase by using tennis balls to represent the plantes (including the sun)
it is a model of a problem!!!
Have a great day!
Hope this helps!
-Lea
Convert 16.8 L of nitrogen monoxide gas at STP to grams .
1.What is the coefficient of the scientific notation answer ?
2.What is the exponent of the scientific notation answer ? 3.How many significant figures are there in the answer?
4.What is the right most significant figure in the answer ?
Convert 12.5 grams of fluorine gas at STP to L.
1.What is the coefficient of the scientific notation answer? 2.What is the exponent of the scientific notation answer? 3.How many significant figures are there in the answer ?
4.What is the right most significant figure in the answer?
Answer:
See explanation
Explanation:
1 mole of a gas occupies 22.4 L
x moles occupies 16.8 L
x = 1 mole * 16.8 L/22.4 L
x = 0.75 moles
number of moles = mass/molar mass
mass = number of moles * molar mass
mass = 0.75 moles * 30.01 g/mol = 22.5075 g = 2.25 * 10^1 g
the coefficient of the scientific notation answer = 2.25
the exponent of the scientific notation answer = 1
significant figures are there in the answer = 6
the right most significant figure in the answer = 3
2.
number of moles = 12.5g/38g/mol = 0.3289 moles
1 mole occupies 22.4 L
0.3289 moles occupies 0.3289 moles * 22.4 L/1 mole
= 7.36736 L = 7.36736 * 10^0 L= 7.37 * 10^0 L
the coefficient of the scientific notation answer =7.37
the exponent of the scientific notation answer = 0
significant figures are there in the answer = 6
the right most significant figure in the answer= 3
How can you control the flow of power in a circuit?
There are multiple ways to prevent these situations from occurring. The three most common protective devices are fuses, circuit breakers, and surge protectors
Explanation:
See if you can think of a way to prove that it is the oxygen in air, not nitrogen, that causes rusting.
Answer:
rusting occur in oxygen and water coz when you put a nail into the water and you leave it three days you will the nail become brownish and that is due to oxygen and water
you have a square with a Perimeter of 16 in,, what is the Area of the square after scaling it by 5?
inches
Answer:
f the figure is a square with a perimeter of 16 inches, then each side of the square is 4 inchest in length. Area is found by multiplying the length x the width. For a square, the length and width are the same. A = 16 sq
Explanation:
The mass of this atom is:
u. 3 mass units
b. 4 mass units
c. 6 mass units
d. 7 mass units
e. 11 mass units
What causes the difference in density of matter?
Answer:
because it has more space
Explanation:
density have many pressure
1. The electron arrangement ions X and Y2 are 2, 8, and 2, 8, 8 respectively.
Write the electronic arrangement of the elements X and Y. (2 mks)
Write the formula of the compound that would be formed between X and Y.
a
mk)
The given question is incomplete. the complete question is:
The electron arrangement ions [tex]X^{3+}[/tex] and [tex]Y^{2-}[/tex] are 2, 8, and 2, 8, 8 respectively.
Write the electronic arrangement of the elements X and Y.
Write the formula of the compound that would be formed between X and Y.
Answer: 1. The electronic arrangement for X and Y are 2,8, 3 and 2,8,5 respectively.
The formula of the compound formed is [tex]X_2Y_3[/tex]
Explanation:
Electronic configuration is the arangement of electrons in an atom in order of increasing energies.
Cations are formed when electrons are lost by atoms and anions are formed when electrons are gained by atoms.
[tex]X^{3+}:2,8[/tex]
[tex]X:2,8,3[/tex]
[tex]Y^{3-}:2,8,8[/tex]
[tex]Y:2,8,5[/tex]
For formation of a neutral ionic compound, the charges on cation and anion must be balanced.
Here element X is having an oxidation state of +3 called as [tex]X^{3+}[/tex] cation and [tex]Y^{2-}[/tex] is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]X_2Y_3[/tex]
Would a rollercoaster have the greatest kinetic energy at the top of the highest hill or at the bottom on the highest hill
Answer:
The rollercoaster has the lowest kinetic energy at the top of the hill.
The rollercaoster has the highest kinetic energy at the bottom of the hill.
Explanation:
The kinetic energy of any solid body in motion is usually computed using this formula:
K.E = [tex]\frac{1}{2}mv^2[/tex]
From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.
We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.
This means that the variations in the K.E are mainly coming from its velocity.
At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.
However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.
At conditions of 785 torr of pressure and 233k a gas occupies a volume of 45.5mL what will be the temperature of the same gas at 745 torr and 634L
Answer:
785
=
233
k
=
45.5
m
L
=
745
=
634
L
=
Explanation:
Calcule el volumen de disolución de LiOH a 3.5 M, necesario para neutralizar una disolución de 25 ml de H2SO3 cuya densidad es de 1.03 g/ml y su riqueza del 60%. (60 PTS.) Alguien puede ayudarme con esto porfabor
Respuesta:
0.11 L
Explicación:
Paso 1: Escribir la ecuación balanceada
2 LiOH + H₂SO₃ ⇒ Li₂SO₃ + H₂O
Paso 2: Calcular la masa de solución de H₂SO₃
25 mL de solución de H₂SO₃ tiene una denisdad de 1.03 g/mL.
25 mL × 1.03 g/mL = 28 g
Paso 3: Calcular la masa de H₂SO₃ en 26 g de Solución de H₂SO₃
La riqueza de H₂SO₃ es 60%, es decir, cada 100 g de solución hay 60 g de H₂SO₃.
26 g Sol × 60 g H₂SO₃/100 g Sol = 16 g H₂SO₃
Paso 4: Calcular los moles correspondientes a 16 g de H₂SO₃
La masa molar de H₂SO₃ es 82.07 g/mol.
16 g × 1 mol/82.07 g = 0.19 mol
Paso 5: Calcular los moles de LiOH que reaccionan con 0.19 moles de H₂SO₃
La relación molar de LiOH a H₂SO₃ es 2:1. Los moles de LiOH que reaccionan son 2/1 × 0.19 mol = 0.38 mol.
Paso 6: Calcular el volumen de solución de LiOH
0.38 moles de LiOH están en una solución 3.5 M. El volumen requerido es:
0.38 mol × 1 L/3.5 mol = 0.11 L
Why do atoms connect to eachother?
Answer:
electrons can bond atoms together
Explanation:
when two atoms share electrons,they are locked together by that sharing.These are called covalent bonds...but when an atom gives one of its electrons to another atom ,they are held together by electric forces.HOPE THAT HELPED☺
Explanation:
electron can bond each other
Can you Help me please...
Answer:
590J or 590.4J :)
Explanation:
2.46 x 6 (35-29= 6) x 40 = 590.4J
Nearest whole number : 590J
what is the electronic structure of an atom with a proton number 11 and mass number 23
Answer:
1s^2 2s^2 2p^6 3s^1
Explanation:
electron configuration of an element gives description of the distribution of electron in it's orbital of the atom, the superscript symbolize number of electron been hold by them.
The element here is sodium, which is a alkali metal
mass number =23
Number of proton= 11
electron must be seen in thelowest-energy subshell that is available in the the 3s orbital,
Hence, the electronic configuration is
1s^2 2s^2 2p^6 3s^1