Explanation:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
Answer:
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups.
Which of these elements has the highest first ionization energy
A) oxygen
B) beryllium
C) fluorine
D) carbon
E) boron
Given 5 Moles of H20. how many moles of O, are produced. Use the following Equation
2H2+O2->2H2O
Moles O2 required : 2.5
Further explanationGiven
Reaction
2H2+O2->2H2O
Required
Moles of O2
Solution
The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants or products)
From the equation, mol ratio of H2O : O2 = 2 : 1, so moles O2 :
= 1/2 x mol H2O
= 1/2 x 5 moles
= 2.5 moles
What are 3 similarities between physical changes and chemical changes
Answer:
Heat change is involved in both process.
II. Both result in change of state of matter
Explanation:
Physical change substance involves the alteration of physical state of a substance. Chemical change substance involves the alteration of the chemical composition of the substance
If the mass of an object is 15kg and the volume of an object is 15ml, what is its density?
0 225kg/ml
Okg/ml
1kg/ml
30kg/ml
Answer:
1kg/ml
Explanation:
PLs help mweee Ill mark brainliest
the 3rd one is the answer
what is the theoretical yield (in mols) of magnesium when 1.1 x 102 mols of lithium reacts with excess magnesium chloride.
Explanation:
Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of compound by the molar mass of the compound expressed in grams.
How could we separate the baking soda from the after after it had already been mixed in? helppp!!!
Answer:
i thing by filtering
Explanation:
WILL MARK BRAINLIEST
*please answer correctly*
I’ve been stuck on this question for a while so I’d appreciate it
The _energy of the baseball is the sum of the kinetic energy and _energy of the particles that make up the baseball
Answer:
Mechanical energy
Kinetic energy
Explanation:
The mechanical energy is the sum of the kinetic and potential energy of the particles that make up the baseball.
Mechanical energy is made up of kinetic energy and potential energy. When the baseball is in motion, the particles make use of the kinetic energy, also known as motion energy and when the ball is not in motion the particles make use of the potential energy, also known as stored energy.
Along with maintaining structure and reproduction, what is the third item that all living things face as a challenge? Question 3 options: How to socialize appropriately How to social distance effectively How to get enough sleep. How to get enough energy for daily life
Answer:
So the answer is gonna be how to get enough energy for your daily life
Explanation:
Sometimes the human body cant get enough energy from the food and protein the food gives out.
What is salinity? (giving you 30 points if you answer it and I give brainlist)
Question 1 options:
a liquid mixture in which the smaller component (solute) is distributed evenly through the major component (solvent)
The concentration of dissolved salt in a liquid
to become incorporated with a liquid in forming a solution
the total amount of salt dissolved in the sea
Answer:
D
Explanation:
Salinity is the saltiness or amount of salt dissolved in a body of water
Answer:
its b trust me i got it right
Explanation:
Which of the following IS NOT an ionic compound?
A) C2H5OH
B) KCI
C) Mg3N2
D) MnO2
Select the correct answer.
What is the formula of the compound vanadium(V) oxide? Use the list of polyatomic ions and the periodic table to help you answer.
A.
VO2
B.
VO5
C.
V5O2
D.
V2O5
E.
V2O2
Answer:
Vanadium(V) oxide is the inorganic compound with the formula V2O5. Commonly known as vanadium pentoxide,
Explanation:
then it is answer D
Which of the following is an example of the reflection of waves?
A)getting a sunburn
B)Your image in a mirror
C)light through the sunroof of a car
D)The movement of a sailboat
Answer:
C
Explanation:
The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected.
To have a system you need more than one magnet .
true or false
Answer:
True
Explanation:
Answer: true
Explanation:
If the theoretical yield of a reaction was calculated to be 42.6 grams and when the
experiment was conducted the amount produced was 20.7 grams, the what is the percent
yield of the experiment?
Answer:
48.59%
Explanation:
theoretical yield = 42.6g
actual yield = 20.7g
% yield = 20.7/42.6 x 100 = 48.59% (2 d.p.)
am i shadow banned or something but lcan someone answer this
Answer: How many warnings have you gotten? depending on that you could've.
Explanation:
A chemical reaction yields 1 mole of lithium hydroxide (LiOH). How many grams of
lithium hydroxide are present?
3 g
48 g
728
24 g
Mass of LiOH= 23.95 grams ≈ 24 g
Further explanationGiven
1 mole of lithium hydroxide (LiOH)
Required
Mass of LiOH
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
n = mass : molar mass
Input the value :
mass = n x molar mass
mass = 1 mole x 23,95 g/mol
mass = 23.95 grams ≈ 24 g
The mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
The mass of a compound present in a mole of sample has been equivalent to the molar mass of the compound. The molar mass of the compound has been the sum of the constituent in a formula unit.
The molar mass of lithium hydroxide (mwt) has been given as:
[tex]mwt=m_L_i\;+\;m_O\;+\;m_H[/tex]
Where, the mass of Li is [tex]m_L_i=6.941\;\rm g[/tex]
The mass of oxygen is [tex]m_O=16\;\rm g[/tex]
The mass of hydrogen is [tex]m_H=1\;\rm g[/tex]
Substituting the values for molar mass (mwt) of LiOH:
[tex]mwt=6.941\;+\;16\;+\;1\;\text g\\mwt=23.941\;\text g\\mwt=24\;\text g[/tex]
The molar mass of LiOH has been 24 g.
The molar mass has been equivalent to the mass of 1 mole of sample. Thus, the mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
For more information about mass of mole, refer to the link:
https://brainly.com/question/1370888
_NaHCO(s) --> _CO2+_NaCO(s)+_H2O
balance the equation
The balanced equation :
2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
Further explanationGiven
Reaction
NaHCO(s) --> _CO2+_NaCO(s)+_H2O
Required
The balanced equation
Solution
Maybe the equation should be like this :
NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
Give a coefficient
NaHCO₃⇒aCO₂ + bNa₂CO₃+cH₂O
Make an equation
Na, left=1, right=2b⇒2b=1⇒b=1/2
H, left=1, right=2c⇒2c=1⇒c=1/2
C, left=1, right=a+b⇒a+b=1⇒a+1/2=1⇒a=1/2
The equation becomes :
NaHCO₃⇒1/2CO₂ +1/2Na₂CO₃+1/2H₂O x2
2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
For the balanced equation shown below, if the reaction theoretically
should produce 7.99g CaO but experimentally produces 6.81 grams of
CaO, what is the percent yield?
CaCO3---->CaO+CO2
85.23%
0 14.77%
54.41%
O 117.33%
Answer:
Percent yield = 85.23%
Explanation:
Given data:
Theoretical yield = 7.99 g
Actual yield = 6.81 g
Percent yield of CaO = ?
Solution:
Formula:
Percent yield = ( actual yield / theoretical yield ) × 100
by putting values,
Percent yield = (6.81 g/ 7.99 g) × 100
Percent yield = 0.8523× 100
Percent yield = 85.23%
I need help with this one question
Answer:
colder
Explanation:
I WILL GIVE YOU BRAINLY PLSS!!! :(
Budding is a form of ______________ reproduction in which a new ______________
develops from a bud or outgrowth due to _________ division. The new organism remains
attached as it grows, separating from the ___________________ only when it is mature.
3. Vegetative reproduction is a form of _____________ reproduction in ___________ .
It is a process by which new organisms are produced without _______________ or
_______________ . It can occur naturally or be induced by ______________________ .
Answer:
Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site.
Explanation:
Answer:
Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site.
Explanation:
Nucleus Nucleus Atom 1 Atorn 2 Nucleus Nucleus Atom 3 Atom 4 Which two atoms are of elements in the same group in the periodic table?
Explanation:
The atoms of elements on the same period on the periodic table typically have the same number of valence electrons.
They have the same electronic configuration.
Valence electrons are electrons in the outermost shell of an atom.
The number of electrons in an atom is a good indicator of elements that might potentially belong to the same group.
What happens to the energy when you heat the iron? Why is this happening?
Answer:
When iron is heated in air it reacts with oxygen to form the compound iron oxide. Iron is a solid and oxygen is a gas. 5 Draw diagrams to show how the atoms are arranged in iron, oxygen and iron oxide in the circles below their names. Use different colours for the iron atoms and the oxygen atoms.
Explanation:
why was the turtle shy at the party?
Answer:
Because he likes someone named shelly?
Which best explains why fungi are often called natural recyclers?
They provide a continuous food resource for many other organisms.
They break down rotting materials and return nutrients to the soil.
They take in large amounts of carbon dioxide, helping to clean the air.
O They are found in nature and have many different practical uses,
They break down rotting materials and return nutrients to the soil.
( They don't do photosynthesis since they are much different from plants)
Answer:
B
Explanation:
How many moles of Fe2O3 were used to produce with 11.5 moles of CO2 ?
Moles of Fe2O3 used : 3.83
Further explanationGiven
11.5 moles of CO2
Required
moles of Fe2O3
Solution
Reaction
Fe2O3 + 3CO ⇒2Fe + 3CO2
The reaction coefficient shows the mole ratio of the reacting compound (reactants or products)
From the equation, mol ratio of Fe2O3 : CO2 = 1 : 3, so mol Fe2O3 :
= 1/3 x moles CO2
= 1/3 x 11.5
= 3.83 moles
The pictures below show samples of different substances.
The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?
A. No, because they have different masses.
B. No, because they have different volumes.
C. Yes, if each sample contains 6.02 x 10^23 atoms.
D. Yes, if each sample contains 2 amu.
Answer:
C. Yes, if each sample contains 6.02 x 10²³ atoms.
Explanation:
It is possible for each sample to contain 1 mole of each sample if and only if each of the sample if made up of 6.02 x 10²³ atoms.
6.02 x 10²³ atoms is the Avogadro's number. This number is equivalent to a mole of a substance.
If the amount of matter in the given substance is at least one mole, it is possible that they are made up of one mole each of each substance. If they contain lesser amount of atoms, then it is not up to one mole of substance. But if it is greater, then, we can have even more than one mole of substance.A mole is simply a unit of measurement and it is equivalent to 6.02 x 10²³ atoms.
Answer:
C
Explanation:
i just took the test
:)
please help me i really am struggling
Answer:
It is visible light
Explanation:
The sum of 4.824 + 2.03 + 4.72319 + 123.4567 + 111.1 expressed to the
proper number of significant figures is
Answer:
246.13389
Explanation:
Simplify the expression.