Answer:
Our sun is an averaged size star compare to other stars.. And the Iron are the heaviest element they can form.
Answer:
Our sun is an averaged size star compare to other stars.. And the Iron are the heaviest element they can form.
HELP ME PLEASE. I DONT HAVE MUCH TIME LEFT!
Select the correct answer. Which molecule has polar bonding and is nonpolar? OA H₂O OB. BF3 OC. NH3 OD. NC13 O E. CH₂Cl2
Answer:
B. is your correct answer
Explanation:
Baby Smiley has curly hair, but neither of her parents do. Is this possible?
Answer:
yes it was a one in four chance
Explanation:
Pb has an atomic number of 82. It has an isotope Pb-207. The mass number is 207.
How many protons are in Pb 207?
O 82
125
O 207
none of these
Answer:
Number of protons = 82
Explanation:
Given data:
Atomic number of Pb = 82
Mass number of Pb-207 = 207
Number of protons = ?
Solution:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
Atomic number of Pb = number of protons or electrons
82 = number of protons or electrons
Mass number = Number of protons + number of neutron
207 = 82 + number of neutron
Number of neutrons = 207 - 82
Number of neutrons = 125
There are 12 liters of nitrogen gas in a sample. How many moles of N2 in this sample?
Answer:
0.54 moles of N2
Explanation:
First remember to find the volume in moles, 1 mole equals 22.4 liters.
So now use the dimensional analysis to show your work.
12 liters of N2 * 1 mol /22.4 liters of N2
Now calculate this. 12 * 1/22.4 or 12/ 22.4
12/22.4 = 0.535714286.
12 has two significant digits.
With that, The answer rounds to 0.54.
So that the final answer is 0.54 moles.
Hope it helped!
Rank the following elements from highest to lowest ionization energy.
I, Cl, F, Br
Help plsssss:(
Answer:
F
Cl
Br
I
Explanation:
Br=11.81...
Cl=12.96...
F=17.42...
Iodine=10.45
Please Help me it’s balancing equations
Answer:
Blank 1: 1
Blank 2: 1
Blank 3: 2
Explanation:
I think the question is like this __Na2O +___H2O =___NaOH
I used "á" this word as equal sign. Is there any wrong with that?
Why is water considered a pure substance but orange juice a compound?
Answer: A mixture is when two or more substances combine physically together. However, in water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone. Therefore, water is not a mixture; it is a compound and it is pure. A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure. B Because its composition is not uniform throughout, orange juice is a heterogeneous mixture. A Aluminum oxide is a single, chemically pure compound. A Selenium is one of the known elements.
Hope this helps :)
WILL MARK U BRAINLIEST. How many atoms of oxygen are found in one mole of naturally occurring oxygen gas (O2)? Is this different from the number of atoms found in one mole of pure solid iron? Be sure to explain your answer using reference to Avogadro's number.
Answer:
The atomic mass of each element is listed below the symbol of the element in the periodic table: Cu =
63.55 amu, Hg = 200.59 amu, S = 32.07 amu, and He = 4.00 amu. The mass of Avogadro’s number of atoms
is the atomic mass expressed in grams. Therefore, 6.02 × 1023 a
Explanation:
Categorize the following reaction: CH4 + O2 ---> CO2 + H2O *
Synthesis Reaction
Combustion Reaction
Replacement Reaction
Decomposition Reaction
Answer:
combustion reaction
Explanation:
combustion reactions have the end products H20 and C02
CO2(g) + H2O(I) - -> C6H12O6(s) + O2(g)
How many of the chemicals in the equation above are aqueous? #only
Answer:
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but PhC2H5 + O2 = PhOH + CO2 + H2O will; Compound states [like (s) (aq) or (g)] are not required. If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Explanation:
If one person reacts to something in a certain way, that means ALL people will react to the
same situation in the same way (Johnny gets stung by a bee, now he kills every bee he sees).
O TRUE
O FALSE
Hi there,
My answer would be False.
Please mark
Thanks
The statement is false that if one person reacts to something in a certain way, that means ALL people will react to the same situation in the same way (Johnny gets stung by a bee, now he kills every bee he sees).
What makes this statement false?According to this question, if one person reacts to something in a certain way, that means ALL people will react to the same situation in the same way.
An example then states that Johnny gets stung by a bee and begins to kill every bee he sees.
This statement is false because when Johnny gets stung by a bee, everyone should react to the situation the same way Johny Johnny did.
Learn more about false statements at: https://brainly.com/question/24701431
Calculate the number of formula units of KMnO4 in 100 mols
Answer:
100 moles of KMnO₄ contain 602.2 × 10²³ formula units.
Explanation:
Given data:
Number of moles of KMnO₄ = 100 mol
Number of formula units = ?
Solution:
The given problem will be solved through Avogadro number.
1 mole contain = 6.022 × 10²³ formula units
100 mol × 6.022 × 10²³ formula units / 1 mol
602.2 × 10²³ formula units
Thus, 100 moles of KMnO₄ contain 602.2 × 10²³ formula units.
what is the systematic name of NaCl
Answer:
The answer is Sodium chloride.
Na is sodium and Cl is chlorine.
Choose the formula for calcium silicate.
A: CaSiO3
B: Ca(SiO3)2
Can someone help me with questions 4-5
21 points
4. describe three ways carbon dioxide was removed from the Earth's atmosphere.
Answer: Forests: Photosynthisis helps clear carbon dioxide naturally, Soils naturally store carbon, but agricultural soils are running a big deficit due to intensive use. Because agricultural land is so expansive, Bio-energy with Carbon Capture and Storage (BECCS) is another way to use photosynthesis to combat climate change. However, it is far more complicated than planting trees or managing soils — and it doesn’t always work for the climate.
5. Explain why there is now 21% Oxygen in the Earth's atomosphere compaired to little or no Oxygen in the Earth's atmosphere 4.5 billion years ago.
Answer: cientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.
Sorry its soooo long TwT
How many moles are in 3.45 g of Ba(CIO3)2 ?
0.0113 mol Ba(ClO₃)₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structures
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
3.45 g Ba(ClO₃)₂
Step 2: Identify Conversions
Molar Mass of Ba - 137.33 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Ba(ClO₃)₂ - 137.33 + 2(35.45) + 6(16.00) = 304.33 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.45 \ g \ Ba(ClO_3)_2(\frac{1 \ mol \ Ba(ClO_3)_2}{304.33 \ g \ Ba(ClO_3)_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.011336 \ mol \ Ba(ClO_3)_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.011336 mol Ba(ClO₃)₂ ≈ 0.0113 mol Ba(ClO₃)₂
Triassic, Jurassic, and Cretaceous: these are also divisions of the Mesozoic Era
Answer:
correct
Explanation:
thanks for being a smarty pants
!!PLS HELP ASAP!!
In the process of creating ammonia (NH3), nitrogen gas (N2 ) is combined with hydrogen gas (H2) that is extracted from hydrocarbons such as methane (CH4) or propane (C3H8) gas. Manufacturers must determine the appropriate amount of each reactant so as to produce the highest yield of product.
The balanced reaction for ammonia is below:
N2+2H3→2NH3
Explain why determining the limiting reactant is important to a manufacturer trying to produce NH3 and the effect of running out of reactant.
pooopppppppppppnhjjnjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
oi oi oi oi oi help pls
Answer:
F
Explanation:
nonmetal doesn't conduct, is shiny and silver and is solid. Hope this helps :)
The mass per mole of a substance is called its molar mass.
True or false
The molar mass of a substance is the mass in grams of one mole of that substance. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units....
hope that helps
so i think that it is false because base on the statement above si the decision is yours just read it thanx
We are ALWAYS conscious (aware) of why we decide to do the things we do:
True or false
Answer: true
Explanation:
What does the term periodic mean?
Answer:
relating to the periodic table of the elements or the pattern of chemical properties that underlies it.
Explanation:
Answer:
Periodic refers to properties that repeat at certain intervals. Explanation: The elements on the periodic table repeat at intervals called periods.
Explanation:
How is the periodic table useful today?
Answer:
The periodic table is useful today for finding out all the elements that exists on Earth. The elements there can be used to write down chemical formulas, calculate things like molar mass/atomic mass of each element, atomic number for each, number of valence electrons each element has, the oxidation number for each, etc. Lastly, it can be used to predict the properties of elements yet to be discovered.
Explanation:
Hope it helped!
What is the volume of 25 g of ethyl alcohol with a density of 0.79 g/mL?
Answer:
31.64...
Explanation:
The formula is volume is equal to mass over density.
So 25/0.79=31.64...
The volume of ethyl alcohol is 31.645mL.
What is volume?Volume is the amount of space the matter occupies.
What is ethyl alcohol?Ethyl alcohol is a clear, colourless liquid and the main ingredient in alcoholic beverages.
Density = mass/volume
D = m/v
v x D = m
On multiply both sides by D,
v x D/D = m/D
v = m/D
= 25g/0.79g/mL
= 31.645mL
Hence, the volume of ethyl alcohol is 31.645mL.
To learn more about volume and ethyl alcohol here
https://brainly.com/question/21009169
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Which of the following pairs of compounds will react to form a precipitate? Why?
calcium chloride and silver nitrate
sodium iodide and potassium chloride
calcium chloride and sodium nitrate
Answer:
calcium chloride and silver nitrate
Explanation:
A precipitate is often formed in a double replacement reaction when the reaction yields an insoluble product.
Consider the reaction between calcium chloride and silver nitrate;
CaCl2(aq) + 2AgNO3(aq) -------->2AgCl(s) + Ca(NO3)2(aq)
AgCl is insoluble in water, hence the reaction leads to the formation of a precipitate.
Which of the following is NOT a kitchen tool category?
A. Measuring
B. Convection oven
C. Food preparation
D. Cutting
Answer:
B. Convection oven
Explanation:
The following are all in a kitchen tool category;
I. Measuring: this includes tools such as tapes, scale (balance), graded-cup, teaspoon, which are used for taking measurements of food items in the kitchen.
II. Food preparation: it comprises of various tools used in the kitchen for the preparation of food. This includes pots, cooker, spoon, turner etc.
III. Cutting: these are tools used for cutting food items and it include knives, chopping board, grinder etc.
A convection oven is typically designed and developed with multiple fans for circulation of air and as such it is used for baking. It is mainly used in big industries and restaurants.
Most neutral atoms of phosphorus have an atomic mass of 31 amu and an
atomic number of 15. What are these atoms composed of?
O A. 15 protons, 31 neutrons, and 15 electrons
B. 15 protons, 16 neutrons, and 15 electrons
C. 15 protons, 16 neutrons, and 16 electrons
D. 15 protons, 15 neutrons, and 15 electrons
Answer:b
Explanation:
don’t listen to the guy in the comments
The element contains 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number).
What are protons, neutrons and electrons?The atomic number for any component exists as the number of protons in its atomic nuclei. In a neutral atom, the number of electrons exists exactly as the number of protons. The atomic mass (mass number) exists as the totality of the protons and neutrons in the nucleus. The mass number can change due to the particular that the number of neutrons can vary. Isotopes exists called for their mass numbers.
So, this element contains 15 protons (atomic number), 15 electrons, and 16 neutrons (mass number minus atomic number).
This isotope exists phosphorus - 31, which contains atomic number 15.
Therefore, the correct answer is option B. 15 protons, 16 neutrons, and 15 electrons.
To learn more about protons, neutrons and electrons refer to:
https://brainly.com/question/8480847
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a. How many moles of H2 are produced from two
moles of CH4 ?
What is the molar mass of chlorine gas? (Hint: Be careful... the gas exists as Cl2)
Select one:
a. none of the above
b. 35.5 g
c. 71.0 g
d. 17.125 g
the calculation was like 70.90 so would it be none of the above??
Which of the following could affect infiltration of water into the surface of the soil? Explain in detail.
I. Concrete sidewalks
II. Parks and gardens
I WILL MARK AS BRAINLIST
Answer:
I. Concrete sidewalks
Explanation:
One of the factor that affects the infiltration of water into the surface of the soil is the use of concrete sidewalks.
A concrete sidewalk prevents water from infiltrating down into the soil profile. Infiltration deals with the movement of water into the soil or ground. It is the major source of ground water recharge. Also, infiltration makes water available for plants.Concrete is impermeable and non - porous media
When concrete pavements are used, water will not be able to move into the ground. They run on the surface and collects into nearby streams and water bodies.