Answer:
B: Presence of ashes
Explanation:
Burning molecules turns them into other molecules
Answer:B
Explanation:
A 6g sample of carbon allowed to burn in 20g of oxygen gas produce carbon dioxide. After the reaction, the mass of unreacted oxygen is 4 g. What mass of carbon dioxide was produced? show with steps
Answer:
Approximately [tex]22\;\rm g[/tex].
Explanation:
Look up the relative atomic mass data of carbon and oxygen on a modern periodic table:
[tex]\rm C[/tex]: [tex]12.011[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass of [tex]\rm O_2[/tex] and [tex]\rm CO_2[/tex]:
[tex]M(\rm O_2) = 2 \times 15.999 = 31.998\; \rm g \cdot mol^{-1}[/tex].
[tex]M(\rm CO_2) = 12.011 + 2 \times 15.999 = 44.009 \; \rm g \cdot mol^{-1}[/tex].
The question suggests that [tex]20\; \rm g - 4\; \rm g = 16\; \rm g[/tex] of [tex]\rm O_2[/tex] took part in this reaction. Calculate the number of moles of molecules in that [tex]16\; \rm g[/tex] of [tex]\rm O_2\,[/tex]:
[tex]\displaystyle n(\mathrm{O_2}) = \frac{m(\mathrm{O_2})}{M(\mathrm{O_2})} = \frac{16\; \rm g}{31.998\; \rm g \cdot mol^{-1}} \approx 0.500\; \rm mol[/tex].
Since [tex]\rm O_2[/tex] is in excess, it would react with [tex]\rm C[/tex] at a one-to-one ratio to produce [tex]\rm CO_2[/tex]:
[tex]\rm C + O_2 \to CO_2[/tex].
Notice the ratio between the coefficient of [tex]\rm O_2\![/tex] and [tex]\rm CO_2[/tex]: [tex]\displaystyle\frac{n(\mathrm{CO_2})}{n(\mathrm{O_2})} = \frac{1}{1}[/tex]. For each mole of [tex]\rm O_2[/tex] that is consumed, one mole of [tex]\rm CO_2\![/tex] will be produced.
The question implies that [tex]16\; \rm g[/tex], which is approximately [tex]0.500\; \rm mol[/tex], of [tex]\rm O_2[/tex] was consumed in this reaction. Accordingly, [tex]0.500\; \rm mol\![/tex] of [tex]\rm CO_2[/tex] will be produced.
Calculate the mass of that [tex]0.500\; \rm mol\![/tex] of [tex]\rm CO_2[/tex]:
[tex]m(\mathrm{CO_2}) = n(\mathrm{CO_2})\cdot M(\mathrm{CO_2}) \approx 22\; \rm g[/tex].
Which of the following does not apply to water molecules?
Water molecules are polar
Water has cohesive properties
Water is less dense as a solid than a liquid
Water is not a very good solvent
Answer:
It is the last one.
Explanation:
Water molecules are polar, they have cohesive properties, and water is less dense when it is solid than when it is a liquid, that is why ice floats in liquid water. However, water is a very good solvent, it can dissolve many solids, including sugar, salt, and other hydrophilic substances.
Can someone help me plz for BRAINLIST I swear I’ll give it to you !! I’m in 6th grade ( just started ) please help I’m begging !!
Answer:
Lithium Li 3 3 4
Titanium Ti 22 22 26
Cobalt Co 27 27 32
Silicon Si 14 14 14
Platinum Pt 78 78 117
Bromine Br 35 35 45
Nickel Ni 28 28 31
Manganese Mn 25 25 30
Boron B 5 5 6
Oxygen O 8 8 8
Zinc Zn 30 30 35
Lead Pb 82 82 125
Explanation:
Can I have brainliest? This took me like an hour to find the answers and type the answers. TYSMMMMMMMMMMMMMMM
Edit: I am also in 6th grade, but I looked it up because I haven't learned this yet.
(02.01 LC)
Which landform represents a large area of thick ice that moves slowly?
Answer:
Glacier
Explanation:
What would happen to the sup- ply of ATP in your cells if you did not eat enough carbohydrates? How would this affect your cells?
Answer:
ATP supply will reduced or decrease drastically
Explanation:
ATP will reduced because carbohydrates are energy given food. Chemical energy are in carbohydrates, therefore when the undergo digestion i.e breakdown of larger pieces into smaller pieces, it is broken down into glucose i.e energy is released. Therefore, if there is now carbohydrates, ATP supply will reduced and there won't be energy needed for different cellular metabolic activities. The breakdown of carbohydrate supply energy.
2. How can glass be a liquid if it's so hard?
Explanation:
Glass is not a liquid in the strictest sense of the word. But it is also not a standard solid. The chemistry of glass is complex and research is ongoing, but the current consensus is that glass is a phase of matter all its own, known as an "amorphous solid". Scientists refer to any amorphous solid as a "glass". Glass transitions are highly complex and cannot be treated in the same way as traditional phase transitions.
Answer:
It's a liquid state before its cooled.
What liquid is the most vicious ?
A) water
B) skim milk
C)salt water
D) pancake syrup
What do the rows of the periodic table indicate?
Answer:
The rows on the periodic table are called periods. All the elements in a period have valence electrons in the same shell. The number of valence electrons increases from left to right in the period. When the shell is full, a new row is started and the process repeats.
Explanation:
hope this helps..
Which of the following can be represented by a single chemical symbol?
Group of answer choices
potassium chloride
sulfate ion
water
sodium
Answer:
Sodium
Explanation:
Sodium is a pure chemical, hence it can be represented by the single chemical symbol Na.
Water has a chemical symbol of H2O, consisting of two, and not one, symbols, H and O.
Sulfate ion consists of a sulfide ion and four oxygen ions (SO4)2-. Hence, it does not fit.
Finally, potassium chloride has a chemical symbol of KCl. Consisting of two different chemical symbols, (K and Cl), it does not fit either.
Hope this helped!
3.) All matter has both physical and chemical properties. A physical property is one that does not change the chemical nature of matter. Which of these choices is a physical property?
A.) height
B.) flammability
C.) ability to rust
D.) reaction with water
Answer:
D
Explanation:
It would be D because you are observing the reaction and don’t change anything
A baseball player makes $15,000,000/year How much do they make in dollars per minute
Answer:
$28.5388
Explanation:
First you need to find the amount of money per day by doing 15,000,000/365
Then find the amount of money per hour by doing 41095.890411/24
Finally you find the amount per minute by doing 1712.32876713/60 to get 28.5388127855.
Round if necessary
Please help! It would be amazing if you can!!
Answer:
3) Warm Temperatures and High pressures
Explanation:
This is the typical characteristic of southern air masses moving north
Which of these is an example of chemical separation of a substance?
-Distillation
-Magnetism
-Paper Chromatography
-Bond breaking
Answer:
Bond broking
Explanation:
Bond broking.
If all objects masses are the same, then the object with the least ___ is the densest?
Possible Answers:
A: Mass
B: Volume
C: Weight
D: Density
Answer:
its weight
Explanation:
mass is how much space it takes up the volume stays the same density is what happens after so its weight
what is the empirical formula of a compound that has a carbon to hydrogen ratio 2-6
CH3 is the empirical formula of a compound that has a carbon to hydrogen ratio 2-6.
What is empirical formula?
The empirical formula of a chemical compound is the simplest and most basic ratio of the constituent elements present in it. It is written as the smallest whole-number ratio of the constituent elements, and does not indicate the amount or concentration of each element.
The empirical formula of a compound is the simplest whole number ratio of atoms in a molecule. In this case, the given carbon to hydrogen ratio of the compound is 2:6, which can be simplified to 1:3. This means that for every one carbon atom, there are three hydrogen atoms in the compound.
6H / 2C × 1/2 / 1/2 → 3 H / 1C
Therefore, the empirical formula of this compound is CH3.
To learn more about empirical formula the link
https://brainly.com/question/14044066
#SPJ1
property of an acide
Answer:
hi
Explanation:
acids are corrosive, rective when combined with bases form salt and when combined with metal form h2o
Answer:
page no,165 ma xa. yo question KO ans
How many atoms are present in a sample of Potassium (K) weighing 33.49g?
Answer:
5.158 × 10²³ atoms K
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
33.49 g K
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of K - 39.10 g/mol
Step 3: Convert
[tex]33.49 \ g \ K(\frac{1 \ mol \ K}{39.10 \ g \ K} )(\frac{6.022 \cdot 10^{23} \ atoms \ K}{1 \ mol \ K} )[/tex] = 5.15797 × 10²³ atoms K
Step 4: Check
We are given 4 sig figs. Follow sig figs and round.
5.15797 × 10²³ atoms K ≈ 5.158 × 10²³ atoms K
which groups have elements with more than one positive oxidation state?
Answer:
(Ar, Xe, Rn) is the answer
According to the electronic configuration groups three to twelve have elements with more than one positive oxidation state.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
https://brainly.com/question/13497372
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Am I correct?? Help please
Answer:
I would say you are correct.
Explanation:
Answer:
I believe it'll be A (even though you chose it already).
Explanation:
You are doing math homework and get frustrated and throw the 7 kg book with a force of 47
Newtons. How much acceleration will the book have when you throw it?
Answer:
The answer is 6.71 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{47}{7} \\ = 6.714285...[/tex]
We have the final answer as
6.71 m/s²Hope this helps you
What element is represented in this model if the atomic number is 3?
This is science
Answer:
Lithium (Li)
Explanation:
Lithium has an atomic number of 3
help me solve. this is science. Which one is it
Answer:
d is the correct answer i think
what is hydrophobic
Answer:
water fearing particle can be termed as HYDROPHOBICAnswer:
Hydrophobic means "scared of water" or "the fear of water."
Hydro = water
phobic = fear
You'll use this at one point in Biology class.
When 2.5 moles of N2 react according to the reaction below, how many moles of NH3 will be produced?
N2 + 3 H2 --> 2 NH3
O 2.5 moles NH3
0 2.0 moles NH3
O 1.3 moles NH3
5.0 moles NH3
Answer:
5 mol
Explanation:
by stoichiometry
nN2/1=nNH3/2
2.5=nNH3/2
nNH3=2.5×2
nNH3= 5 mol
Answer: I got 5.0 moles
Explanation:
Three friends were kicking soccer balls at a neighborhood field. Three soccer balls were rolling across the field. The black soccer ball has less mass than the blue and orange balls, which have equal mass. All three soccer balls were kicked by one of the friends, but not all from the same direction. Use the information in the diagram to answer.
Which soccer ball(s) experienced the strongest force? How do you know?
A. All three soccer balls experienced the same force because they changed speed by the same amount.
B the orange soccer ball it has more mass and the fastest ending speed
c. the blue soccer ball it takes a stronger force to slow down a more massive object than to speed it up.
D the blue and orange soccer balls they have more mass than the black soccer ball changed speed by the same amount
Answer: d :The blue and orange soccer balls; they have more mass than the black soccer ball, but changed speed by the same amount.
Answer:
the answer is d
Explanation:
Please help!!!! This equation is balanced: CaCO3 - CaO + CO2
True
False
What does the text indicate about the relationship between distance and gravitational force?
Answer:
The force of gravity is inversely related to the distance the alien is from Earth; this means that force of gravity decreases as the distance between the alien and Earth increases. As the distance between the alien and the surface of the planet increases, the force of gravity decreases.
Explanation:
HELP!!!
i will mark brainliest
Answer:
Blank #1: noble gas
Blank #2: bonding
Blank #3: octet rule
Blank #4: share
Blank #5: filled
Blank #6: halogen
Please give me brianliest!!
how many electrons are there in 2 g of H2
Answer:
6.02 x 10²³ electrons
Explanation:
Given parameters:
Mass of H₂ = 2g
Unknown:
Number of electrons = ?
Solution:
To find the number of electrons, we must determine the number of moles of H₂ first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles = [tex]\frac{2}{2}[/tex] = 1mol
1 mole of a substance contains 6.02 x 10²³ particles
the particles can be protons, neutrons, electrons
So,
2g of H₂ will contain 6.02 x 10²³ electrons.
Which of the following is true about waves?
A.
They are always visible.
B.
They always move matter.
C.
They carry energy.
D.
They can only travel though outer space.
Answer:
c. they carry energy is the answer
Answer:
C. they carry energy
Explanation:
Energy can be carried from one place to another by waves, including water, light, and sound waves. Waves are oscillating disturbances that travel through but do not move matter.
Infrared radiation escaping from hot coals is an example of invisible waves carrying energy. This energy can be felt as heat.