Answer:
the answer is D
Explanation:
percentage composition= mole of the substance divided by the total molar mass of the compound multiplied by 100.
which of the following elements has the lowest ionization energy?
a. Argon
b. Hydrogen
c. Beryllium
d. Hellium
Among the given options, the element that has the lowest ionization energy is beryllium. Thus, the correct option for this question is C.
What do you mean by Ionization energy?Ionization energy may be defined as the amount of energy that is significantly required in order to eliminate an electron from an isolated atom or molecule. It is the minimum energy required to remove the most loosely bound electron of an isolated gaseous atom, positive ion, or molecule.
The group of elements that have the lowest ionization energy is known as alkali metals or alkali earth metals. This is because of the shielding effect that the ionization energy decreases from top to bottom within a group. Beryllium is a member of group 2 which has the lowest ionization energy. While Fluorine is said to have the highest ionization energy.
Therefore, the element that has the lowest ionization energy is beryllium. Thus, the correct option for this question is C.
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Which most accurately describes the universe as we currently describe it?
Answer: The universe consists of all physical objects on earth in space
Explanation:
WILL MARK BRAINLIEST IF YOU ANSWER WITHIN 5 MINUTES
Look at the following enthalpy diagram. Select all that apply.
A large activation energy is required for this reaction to take place.
The products have more energy than the reactants.
The products are more stable than the reactants.
This is an addition reaction.
This is a substitution reaction.
Answer:
This is and ADDITION REACTION
Explanation:
Because your putting a compound and an element together
Answer:
This is an addition reaction.
The products are more stable than the reactants.
Explanation:
What is the balanced equation for KOH+CO2—>K2CO3+H2O
The balanced equation :
2KOH+CO₂⇒K₂CO₃+H₂O
Further explanationEqualization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction
KOH+CO₂⇒K₂CO₃+H₂O
give coeffiecientaKOH+bCO₂⇒K₂CO₃+cH₂O
make equationK, left=a, right=2⇒a=2
H, left=a, right=2c⇒a=2c⇒2=2c⇒c=1
O, left=a+2b, right=3+c⇒a+2b=3+c⇒2+2b=3+1⇒2b=2⇒b=1
the equation becomes :
2KOH+CO₂⇒K₂CO₃+H₂O
Why are metals good conductors of heat?
O A. The free-moving electrons transmit heat quickly.
B. The malleable atoms slide past each other, transmitting heat.
O c. The formation of alloys allows a path for heat to travel.
O D. The ductility allows heat to move along an edge quickly.
Answer: A. The free-moving electrons transmit heat quickly.
Explanation:
Answer:
the free-moving electrons transmit heat quickly.
Explanation:
i just took the test
whats the diffrence beetween fluids and nonfluids
Answer:
One is a fluid and one is not.
Explanation:
Fluid is a common state of certain substances, or a type of matter. Liquid is one of the three phases or state of matter. Fluids flow and has some viscosity (thickness). Liquids also flows and it has volume, but no definite shape. A non fluid is a substance that is not a liquid.
Answer:
one is limited and one isn't
Which of these elements is the most chemically reactive?
A.
strontium (Sr)
B.
beryllium (Be)
C.
radium (Ra)
D.
calcium (Ca)
The most chemically reactive element among the listed elements is Radium (Ra). The correct option is C. radium (Ra)
The elements listed are alkaline earth metals, that is, they belong to group 2 of the period table.
The reactivity of alkaline earth metals increases down the group. That is, the reactivity increases with increase in atomic mass.
Among the listed element, radium (Ra) has the greatest atomic mass and it is the last element as we go down the group.
Hence, the most chemically reactive element among the listed elements is Radium (Ra). The correct option is C. radium (Ra)
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5. An anion of carbon C-4 has how many electrons?
a. 6
b. 8
C. 9
d. 10
Answer:
A.6
Explanation:
An atom of carbon can share four electrons. Carbon has a total of six electrons, with two in the first orbital and four in the second orbital.
1. The molecular mass of hydrochloric acid (HCI) is 36.5 g/mol. How many moles of HCl are in 120g of HCI?
Answer:
3.3 mol HCl
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisExplanation:
Step 1: Define
120 g HCl
Step 2: Identify Conversions
Molar Mass of HCl - 36.5 g/mol
Step 3: Convert
[tex]120 \ g \ HCl(\frac{1 \ mol \ HCl}{36.5 \ g \ HCl} )[/tex] = 3.28767 mol HCl
Step 4: Check
We are given 2 sig figs as our lowest. Follow sig fig rules and round.
3.28767 mol HCl ≈ 3.3 mol HCl
What is this plzzzzz helppp tyvmmmm
The mode of 12, 17, 16, 14, 13, 16, 11, 14,13, 16 is
Answer:
Mean = 14.2Median = 14Mode = 16Range = 6Explanation:
__________________________________________________________
Mean = 14.2 or 14
Median = 14
Mode = 16
Range = 6
__________________________________________________________
Here are all the numbers from least to greatest order: 11, 12, 13, 13, 14, 14, 16, 16, 16, 17.
__________________________________________________________
Hope this helps! <3
__________________________________________________________
Calculate the amount of moles equal to 50.0 g of barium
Please show your work
We will use dimensional analysis to solve this.
We will need the molar mass of barium, which is 137.33 g/mol.
50g × [tex]\frac{1 mol}{137.33g}[/tex] = .36 mol Ba
There are .36 moles of barium in 50g of barium
True testing means that a serious effort is made to _________.
Question 8 options:
be absolutely positively, without a shadow of a doubt, correct.
create experiments that support your hypothesis
falsify (“disprove”) each possible explanation.
complete testing that supports manufacturers claims, so you can cash in and make money.
Explanation:
This explanation is the opposite of true testing - a term known as falsifiability. Falsifiability, when it relates to science, refers to how it should be possible to prove a hypothesis or theory wrong. Thus, the point of testing for falsifiability is to test in which condition is the theory wrong.
A term that might relate to the phrase ‘true testing’ used in the question would be testability. Which refers to the practice of testing a hypothesis or theory to see whether it is true or false.
True testing has been the scientific method that uses various steps to conclude the findings. "True testing means that a serious effort is made to create experiments that support your hypothesis." Thus, option B is correct.
What is True testing?True testing has been defined as the assessment scientific method that is involved in solving the question and issue by formulating the hypothesis and then researching the possible observations and solution that concludes and proves the findings.
It falsifies or proves the hypotheses right or wrong based on the experimental design setup. It does not falsify each possible explanation, nor is always fully correct. It also is not conducted to support the manufacturing and support it financially.
Therefore, option B. True testing experiments to sustain the hypothesis.
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Which of the following is the smallest subatomic particle in an atom?
A: Neutron
B: Proton
C: Electron
D: Compound
Answer:electron
Explanation:
If a mutation changes one base, but the amino acid does not change, what type of effect would this have on the organism?
Neutral
Beneficial
harmful
what is the chemical formula for lithium chloride
Answer:
LiClExplanation:
chemical formula for lithium chloride is LiClhope it helps
plzz mark as brainliest..
Is the following Graph a Function? Why or why not?HELP PLEASE
Answer:
It is a function
Explanation:
The graph does not repeat the x values and passes the vertical line test.
this graphs represents
Among the groups of elements listed below, which have the same number of electrons in their outermost energy levels? C, K, Ca, Rb, Sr
Na,Mg,AI,S
Li,B,C,F
F,CI,Br,I
Answer:
i believe its d
Explanation:
Answer:
I checked and I too think its D
6CO2 + 6H2O → C8H12O6 + 602
A
One compound
B.
One element and one compound
C с
Two elements
D
One element
Answer:
B. One element and one compound
Explanation:
O2 is a diatomic element: "are pure elements that form molecules consisting of two atoms bonded together"
*there are 7 types of diatomic elements
and...
C8H12O6 is a compound
Chemical Compound can be described as "a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds"
How many electrons would be in a calcium cation with a positive 2 charge?
Number of electrons in a Ca²⁺ = 18
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20
Electron configuration of Ca : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²
When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:
[tex]\tt 20-2 = 18[/tex]
and the electron configuration (Ca²⁺ ) becomes:
1s², 2s², 2p⁶, 3s², 3p⁶
any help would be much appreciated, i'm being timed :( i'll mark brainliest and 5 star
Answer:
3 times ....
group 2
Explanation:
As the temperature increases, the molecular motion of the molecules decreases and it
becomes difficult to overcome the polar attractions.
a. TRUE
b. FALSE
Answer:
true
Explanation:
i'm not so sure
How can we use cyanobacteria as an energy source
Answer:
With a short life cycle, greenhouse gas fixation ability, and high lipid production capacity, we use cyanobacteria as an efficient biofuel platform. Carbon dioxide released by the burning of fossil fuel and industrial emissions can be captured and used by these organisms efficiently.
Explanation:
What do cyanobacteria use for energy production?
oxygenic photosynthesis
They commonly obtain their energy through oxygenic photosynthesis, which produces the oxygen gas in the atmosphere of Earth. The name cyanobacteria comes from their color (Greek: κυανός, romanized: kyanós, lit.
Snow is a form of
E: evaporation
F. precipitation
G. condensation
H. transpiration
A block of material has a volume of 50 cubic centimeters, and a mass of 1,000 grams; what is that object's density?
O Why are you asking me this question??
0 .02 cc/g
O None of these answers N
O All of these answers
20 g/cc
050,000 g/cc
O 5 g/ccccc
Answer:
Density = [tex]20\ g/cm^3[/tex]
Explanation:
Given that,
Mass of the object, m = 1000 g
Volume of the block, V = 50 cm³
We need to find the density of the object. Density is equal to mass per unit volume.
d = m/V
[tex]d=\dfrac{1000\ g}{50\ cm^3}\\\\=20\ g/cm^3[/tex]
So, the density of the object is [tex]20\ g/cm^3[/tex].
Se sabe que un compuesto contiene 33.002% de carbono,9.063% de hidrogeno y el resto de oxigeno. El espectrometro de masas indica que la masa molecular aproximada es de 191g/mol(cual es la formula empirica y molecular probable
Answer:
CH3O
C6H18O6
Explanation:
Porcentaje de masa de oxígeno = 100% - (33,002% + 9,063%) = 57,935%
Divida el porcentaje en masa de cada elemento por su masa atómica relativa;
H- 9.063 / 1, C- 33.002 / 12, O - 57.935 / 16
H- 9.063, C- 2.75, O- 3.62
Dividir por la proporción más baja;
H-9.063 / 2.75, C- 2.75 / 2.75, O- 3.62 / 2.75
H- 3, C-1, O- 1
Fórmula emperical = CH3O
Dado que la masa molecular es 191 g / mol
Sea n el número de cada átomo de la molécula
Por tanto, su fórmula molecular es; (CH3O) n = 191
[12 + 3 (1) + 16] n = 191
31n = 191
n = 191/31
n = 6
Por lo tanto, la fórmula molecular del compuesto es; (CH3O) 6 que es C6H18O6
Hi can anyone help Mehh ! :D
Answer: Renewable becuase the trees can be cut and then replanted.
Explanation:
Non-Renewable resources are resources that cannot be replenished easily through natural process. These are the sources which are used in wise manner so that they do not get depleted. For example: coal, petroleum etc.
Renewable resources are resources that can be replenished overtime through natural process.These are the sources which never depletes completely. For example: bio mass energy, solar energy etc.
As trees can be replenished easily through natural process but it takes a long time for it to occur, it is a renewable source.
Weathering, erosion, and deposition act together in a cycle that wears down
and builds up Earth's surface. true or false???
Answer:
The answer is true. Hope this helps
plz help me out guys
Answer:
Switch is the 2 circles
battery is the 2 lines
bulb is the x-men sign
Explanation:
Answer:
hope it helped you
have a nice day