Answers
2. Sodium has higher melting point than potassium because of stronger metallic bonding .
3. Potassium are very soft metal can be very easily cut with a knife
4. Increase of resistance in metals. Therefore the mobility of electrons decreases and causes decrease in conductivity.
5.To increase strength, increase corrosion resistance, or reduce costs.
6. All metals have low ionization energies and are relatively electropositive, and so they lose electrons fairly easily.
7. All the group 1 metals are reactive, but they get more reactive as you go down the group, so potassium is more reactive than sodium.
Related Questions
What is the balanced form of the chemical equation shown below?
N2(g) + H2(9) ► NH3(9)
O A. N2(9) + H2(9) ► NH3(9)
B. N2(9) + H2(g) → 2NH3(9)
)
O C. N2(g) + 3H2(g) → 2NH3(9)
O 9
D. N2(9) + H2(g) → 2NH(9)
Answers
Answer:
C
Explanation:
2 N on left so we put a 2 on the right which makes 6 H so we need 6H on the left to do that we add a coef. of 3 to make 6 H and balance the equation
How is the atomic mass of an element related to a mole?
O A. The atomic mass, in grams, is the mass of 6.02 x 1023 moles.
O B. The atomic mass, in grams, is the mass of 6.02 x 1023 electrons.
O C. The atomic mass, in grams, is the mass of one mole of atoms.
O D. The atomic mass, in grams, is the mass of one mole of protons.
Answers
Answer:
i the answer to your question should be C
Explanation:
Hope this helps!
The atomic mass of an element related to a mole in grams, is the mass of one mole of atoms. Therefore, option C is correct.
What is an atomic mass ?An atom's mass is its atomic mass. Although the kilogramme is the SI measure of mass, the unified atomic mass unit, or dalton, is a common way to express atomic mass. An unbound carbon-12 atom in its ground state has a mass of 112 of a Da.
A mass that is one-twelfth the mass of an atom of carbon-12 is known as an atomic mass unit. Any isotope of any element's mass is represented in terms of the carbon-12 reference standard.
The size of an atom is indicated by its atomic mass. Technically speaking, an atom's mass is the total weight of its protons, neutrons, and electrons.
Thus, option C is correct.
To learn more about an atomic mass, follow the link;
https://brainly.com/question/17067547
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It takes about 38 m3 of boards and plywood to build an average-size, single-family home. Can an average-size, single-family home be built with one day’s output from the saw mill? About how many days will it take for the saw mill to produce enough lumber to build a neighborhood of 100 average-size homes?
Answers
A) The answer to whether an average-size, single-family home be built with one day’s output from the saw mill is; No, it can't be built from one days output
B) The number of days will it take for the saw mill to produce enough lumber to build a neighborhood of 100 average-size homes is; 1100 days
A) From research, the average size capacity saw mill usually produces around 1500 board feet of boards per day.
Now, converting board ft to cubic meter gives;
1 board feet = 1/424 m³
Thus; 1500 board feet = 1500 * 1/424 ≈ 3.54 m³
Now, we are told that it takes 38 m³ of boards and plywood to build an average size single family home.
Since one days output = 3.54 m³
It is less than the volume required for the average sized house and so the daily output will not be sufficient.
B) Number of days to produce enough boards and plywood for the average sized family home = 38/3.54 ≈ 11 days
Thus, for 100 homes;
Number of days = 100 * 11 = 1100 days
Read more about production capacity at; https://brainly.com/question/25899399
Find the volume of 8 gram of oxygen gas
Answers
So 16 g of oxygen contains = N atoms of Oxygen.
{ N= Avagadro number= 6.022 x 10²³}
So 8 g of Oxygen contains= N/2 ATOMS of Oxygen
=6.022x10²³/2
= 3.011 x10²³ atoms
Number of moles of O
2
=
32
8
=
4
1
=0.25
Volume of 1 mol of O
2
at STP =22.4 L
∴ Volume of 0.25 mol of O
2
at STP =22.4×0.25=5.6 L
What is the required mass to prepare a 0.5M potassium chloride solution using 250mL of water
Answers
Molarity = number of moles / Volume of solution
moles = mass / molecular weight
Molecular weight of KCl =( K-39) + (Cl -35.5) = 74.5 g/mole
Volume of soultion = 250 mL = 0.25L
Molarity = 0.5 M
Now ,
Molarity = number of moles / volume of solution
= Mass of KCl / molecular weight of KCl × Volume
0.5 = Mass of KCl / 74.5 × 0.25
Mass of KCl = 0.5 × 74.5 × 0.25 = 9.3125 grams
Hence the mass of KCl required is 9.3125 grams.
Calculate the oxidation number for carbon in CH4
Answers
Answer:
+4
Explanation:
Oxidation number of neutral compound is 0
Oxidation number of hydrogen in methane is -1
C + (-1×4) = 0
C - 4 = 0
C = 4
How many grams of NaOH is needed to neutralize 90 mL of 1.5 N HCl?
Answers
mol = conc × v
= 1.5 × 0.09
= 0.135 moles of HCl
HCl + NaOH > NaCl + H2O
1 mole HCl = 1 mole NaOH
0.135 mol HCl = x
x = 0.135 mol NaOH
mass = mol × molar mass
= 0.135 × 40
= 5.4 g
NaOH = 23 + 16 + 1 = 40 g/mol
I'm not a 100% sure if it's correct
A 6.00 L container of N_2 has a temperature of 273 K. Calculate the volume if the temperature is doubled.
a
24.0 L
b
12.0 L
c
6.0 L
d
3.0 L
Answers
V1=6.00
V2=?
T1=273
T2=273
Making V2 the subject of formula the equation then becomes
V2= V1xT2/T1
6.00x263/273=6.0L
( picture ) identify each type of reaction shown below
Answers
it wouldnt let me type it because it said it was too inappropriate
Explanation:
If 3.31 moles of argon gas occupies a volume of 100 L what volume does 13.15 moles of argon occupy under the same temperature and pressure
Answers
Answer:
397 L
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
If temperature and pressure stays constant, we can rearrange all constant variables onto one side of the equation:
[tex]\displaystyle \frac{P}{RT} = \frac{n}{V}[/tex]
The left-hand side is simply some constant. Hence, we can write that:
[tex]\displaystyle \frac{n_1}{V_1} = \frac{n_2}{V_2}[/tex]
Substitute in known values:
[tex]\displaystyle \frac{(3.31 \text{ mol})}{(100 \text{ L})} = \frac{(13.15\text{ mol })}{V_2}[/tex]
Solving for V₂ yields:
[tex]\displaystyle V_2 = \frac{(100 \text{ L})(13.15)}{3.31} = 397 \text{ L}[/tex]
In conclusion, 13.15 moles of argon will occupy 397* L under the same temperature and pressure.
(Assuming 100 L has three significant figures.)
According to Hebrews 11, what did Abraham believe God would do if Isaac was slain as a sacrifice? Please help me I need it for tonight!
Answers
Answer:
Abraham thought that GOD would raise Issac back from the dead. It was a test and they would sacrifice the donkey instead.
According to Hebrews 11, what did Abraham believe God would do if Isaac was slain as a sacrifice? Please help me I need it for tonight!
Answers
Answer:
ABRAHAM DIDN’T THINK ISAAC WOULD DIE!
When they reached the mountain, Abraham told his servant, “Stay here with the donkey; I and the boy will go over there and worship and come again to you” . The text is careful to include both Abraham and Isaac in the return journey.
Or consider Isaac’s question about where the lamb for the sacrifice would come from. Abraham responds, “God himself will provide the lamb”. It seems Abraham prepared himself to do what God asked, but he expected something else to happen.
The author of the book of Hebrews gives us insight to Abraham’s thoughts. It says, “He considered that God was able even to raise [Isaac] from the dead” Instead of a resurrection, Abraham was spared the sacrifice.
true or false
a. very little oxygen and nitrogen are found in air.
b. oxygen is the main cause of the formation of rust in iron.
c. impure air is odourless.
d. plants take in oxygen gas during respiration.
e. air contains water vapour.
Answers
Answer:
true or false
a. very little oxygen and nitrogen are found in air. false
b. oxygen is the main cause of the formation of rust in iron. false
c. impure air is odourless true
.d. plants take in oxygen gas during respiration. true
e. air contains water vapour. true
Explanation:
Drawing and dialogue please help due tomorrow
Answers
Answer:
Gravity will always be pulling everything towards Earth's center at an acceleration of 9.81 m/sec².
Pure substances can be classified into element and compound. Choose the
CORRECT pair(s).
I Diamond - element
II Salt - compound
III Sugar solution - element
I and Il only
I only
II and III only
III and III
Answers
Diamond : mostly made of carbon (C) so element
Salt: made of sodium ions and chloride ions (NaCI) so coumpound
what will happen to a person who doesn't recognize authors and even citing proper sources?
Answers
it will be called verbatim plagiarism, also called direct plagiarism
what is metal's I need answer
Answers
Answer:
objects thaty release 0H+ and H- ions when dissociated
Explanation:
in chemistry
please mark brainliest
When vectors are added or subtracted, the net force is called the _____.
will give brainliest to whoever gets it right
Answers
Answer:
resultant
Explanation:
9.23 x 10^23 Au atoms= moles Au
Answers
Answer:
1.533 moles Au
Explanation:
To find the moles from atoms, you just use Avogadro's number (6.02214076×10^23 mol^-1) and divide by it. Hope this helped!
Answer:
[tex]\boxed {\boxed {\sf 1.53 \ mol \ Au}}[/tex]
Explanation:
We are asked to find how many moles of gold are in 9.23 *10²³ atoms of gold.
Avogadro's Number or 6.022 *10²³ is used to convert atoms to moles. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are atoms of gold.
We convert using dimensional analysis. Set up a conversion factor using Avogadro's Number.
[tex]\frac {6.022 \times 10^{23} \ atoms \ Au}{ 1 \ mol \ Au}[/tex]
We are converting 9.23 * 10²³ atoms of gold to moles, so we multiply by this value.
[tex]9.23 \times 10^{23} \ atoms \ Au *\frac {6.022 \times 10^{23} \ atoms \ Au}{ 1 \ mol \ Au}[/tex]
Flip the conversion factor so the units of atoms of gold cancel.
[tex]9.23 \times 10^{23} \ atoms \ Au *\frac { 1 \ mol \ Au}{6.022 \times 10^{23} \ atoms \ Au}[/tex]
[tex]9.23 \times 10^{23} *\frac { 1 \ mol \ Au}{6.022 \times 10^{23}}[/tex]
[tex]\frac {9.23 \times 10^{23} }{6.022 \times 10^{23} } \ mol \ Au[/tex]
[tex]1.53271338426 \ mol \ Au[/tex]
The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 2 in the thousandth place tells us to leave the 3.
[tex]1.53 \ mol \ Au[/tex]
9.23 *10²³ atoms of gold is equal to approximately 1.53 moles of gold.
Which element is shown below? How do you know?
Answers
How to find total mass of water in final solution
Answers
Answer:
Explanation:
Just like a solid, the density of a liquid equals the mass of the liquid divided by its volume; D = m/v. The density of water is 1 gram per cubic centimeter.
Can I get some help
Answers
Answer:
I'm afraid not, the image is too blurry
yesss☺️
sorryyyyyy
sorryyyyy
hello guys what is good!
What are all the elements of the P block?
Answers
boron, carbon, nitrogen, oxygen and flourine families in addition to the noble gases.
_________________________________________________________
also to answer the 'hello guys what is good!':nothin u?
__________________________________________
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Tyra designed an experiment to demonstrate an annular solar eclipse. The steps of the
experiment are listed below.
.
e
.
Place a light bulb on a stand.
Stick a pencil into a small styrofoam ball.
Switch on the light bulb and darken the room.
Stand facing the light bulb.
Hold the pencil with styrofoam ball very close to the eye.
Observe the light bulb without moving the eye and styrofoam ball.
Tyra's experiment has a flaw. Which of these statements best describes a method to
correct the flaw in Tyra's experiment? (3 points)
.
.
Place the light bulb behind the observer.
O Clamp the styrofoam ball behind the light bulb.
O Move eye towards the right to observe the light bulb.
Hold the styrofoam ball at arm's length from the eye.
Answers
Answer:
The answer is D.
Explanation:
Hold the styrofoam ball at arm's length from the eye.
the property of matter that determines whether or not an electrical current can pass through it
Answers
WILL GIVE BRAINLIEST (also pls don't copy answers from other ppl :D) Question: Choose two spheres of Earth which interact when hot springs are formed. Use complete sentences to explain how they interact during this process.
Answers
Answer:
Geosphere and Hydrosphere.
Explanation:
Hot springs are heated by geothermal heat—heat from the Earth's interior. In volcanic areas, water may come into contact with very hot rock heated by magma. The geosphere and hydrosphere interact when hot springs form. The geosphere gets a little melted by the hot hydrosphere and then when the springs shoot up in the air they break some rocks.
true or false a change in state of matter would be considered a physical change
Answers
Answer:
true
Explanation:
Because the changes in state of matter would be considered
When Zinc-67 is bombarded with a neutron, a gamma ray is emitted. What radioactive isotope is produced?
Answers
Answer:16/29
Explanation:
How many K are in 32 o C?
Answers
Answer:
273.15 Kelvins
Explanation:
Hope this helps !!!How do plants use the energy from the sunlight?
Answers
Answer:
Hey mate....
Explanation:
This is ur answer....
Plants use a process called photosynthesis to make food. During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Starch is stored in seeds and other plant parts as a food source.
Hope it helps!
Brainliest pls!
Follow me! :)
Answer:
Plants use photosynthesis to convert sun light into their own food to consume. Green plants use this light energy to change water and carbon dioxide into oxygen and nutrients called sugars. The plants use some of the sugars and store the rest. The oxygen is released into the air.