Answer:
l think,probably 6.022 X 1023
Answer:
0.93559956338688
Explanation:
What colour is Calcium Hydroxide solution
Answer:
Lime
Explanation:
How many cubic cm^3 would be present in a space that is 5.00 in x 4.00 in x 7.00 in?
Name the main chemical in baking powder
Answer:
sodium bicarbonate
Answer:
Baking powder
Explanation:
Baking powder is a solid mixture that is used as a chemical leavening agent in baked goods. It can be composed of a number of materials, but usually contains baking soda (sodium bicarbonate, NaHCO3), cream of tartar (potassium bitartrate, C4H5KO6), and cornstarch. (A base, an acid, and a filler respectively.)
Drag the tiles to the correct boxes to complete the pairs.
Chromium is a transition metal, and oxygen has an oxidation number of -2. Use this information to match each compound to its chemical formula.
chromium(VI) oxide
chromium(IV) oxide
chromium(III) oxide
chromium(II) oxide
Each compound and its chemical formula will be as follows:
chromium(VI) oxide - [tex]CrO_3[/tex].
chromium(IV) oxide - [tex]CrO_2[/tex].
chromium(III) oxide - [tex]Cr_2O_3[/tex].
chromium(II) oxide - [tex]CrO[/tex].
Formula of compoundsChromium being a transition metal means that it can assume variable oxidation states in different compounds. Oxygen has a valence of 2.
Thus, when deriving the formula of a compound formed by chromium and oxygen, each atom will take the mole that is equivalent to the oxidation number of the other.
For chromium(VI) oxide, chromium is taking 6 as the oxidation number. Thus the formula of the compound will be [tex]Cr_2O_6[/tex] or [tex]CrO_3[/tex].
For chromium(IV) oxide, chromium takes 4 as the oxidation number. Thus the formula is either [tex]Cr_2O_4[/tex] or [tex]CrO_2[/tex].
For chromium(III) oxide, chromium takes 3. The formula becomes [tex]Cr_2O_3[/tex].
For chromium(II) oxide, chromium takes 2. The formula is either [tex]Cr_2O_2[/tex] or [tex]CrO[/tex].
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A 400 grams bird is flying at a constant speed of 7 m/s. What is the bird's kinetic energy ?
Answer:
Kinetic energy is always 12mv2 , which in this case, is 3.2 J. Explanation: 12mv2=12(0.1 )(8.0)2=3.2J.
What is energy
O The ability to do work.
O renewable particles
O stored particles
moving particles
If a car was driving 45 miles per hour northeast, and is now driving 30 miles per hour
north,
A
the car's velocity decelerated.
B
the car's velocity accelerated.
с
the car's velocity remained unchanged.
D
the car's acceleration is 30 miles per hour.
Answer:
A
Explanation:
need help, no idea what to do
The volume of unreacted Oxygen = 1.25 L = 1.25 dm³ = 1250 cm³
Further explanationGiven
Combustion of propane
3.6 L CO2
7.25 L O2
Required
The volume of unreacted oxygen
Solution
Reaction
C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O
Avogadro's :
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
Vol O₂ = 5/3 x vol CO2 = 5/3 x 3.6 = 6 L
The unreacted : 7.25 - 6 = 1.25 L
Which of the following gases was NOT part of Earth’s original atmosphere?
Answer:anser choices
Explanation:
Answer:oxygen hahah
Explanation:
What do the dots in this image represent?
Ionic bonds in water
Covalent bonds in water
Shared valence electrons
Unshared/lone pairs of valence electrons
The dot in the image represents the unshared/ lone pair of electrons. The correct option is D. Dots are written around the element in an equation.
What are unshared electrons?Unshared or lone electrons are those electrons, which are lone and not shared with another atom when making a covalent bond. These electrons are represented by dots. The valence electron help in making the valence complete of other atoms when forming a bond.
The diagram is of water, oxygen has six valence electrons, of which two are shared by hydrogen and four are lone electrons. The lone pairs will be attached to other hydrogen molecules.
Thus, the correct option is D, Unshared/lone pairs of valence electrons regarding the representation of the dots in the image given.
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What process formed the water droplets in Scott's model? O evaporation O transpiration o condensation O precipitation
Answer: My guess would be condensation.
Explanation: Condensation makes water into water droplets.
How do we get energy from the food we eat?
A
The constantly moving molecules in food give us kinetic energy.
B
Breaking the molecular bonds in the food releases stored chemical energy.
C
Eating hot food transfers thermal energy to our bodies.
D
The chemical energy stored in the food is transferred to us as thermal energy.
BACK
Answer:
A
Explanation:
I used my resources and they was explaining and I came to a resolution that it was A
A gas container was filled with 2.3 moles of nitrogen gas. If the original volume
was 3.4 what would be the new volume if the container ended with 5.7 moles of
nitrogen?
Answer:
V₂ = 8.43 L
Explanation:
Given data:
Initial number of moles = 2.3 mol
Initial volume = 3.4 L
Final volume = ?
Final number of moles = 5.7 mol
Solution:
According to Avogadro law,
The number of moles of gas is directly proportional to its volume. By increasing the number of moles volume also goes to increase.
Mathematical relationship:
V₁ / n₁ = V₂ / n₂
By putting values,
3.4 L / 2.3 mol = V₂ / 5.7 mol
V₂ = 3.4 L× 5.7 mol / 2.3 mol
V₂ = 19.38 L.mol / 2.3 mol
V₂ = 8.43 L
Calculate the number of carbon atoms contained in 5.6 g of C2H4
Molecular mass of C₂H₄ is,
M = 2×12 + 4×1 g/mol
M = 28 g/mol
Moles of C₂H₄ in 5.6 g of C₂H₄ :
n = 5.6/28 mol
n = 0.2 mol
Now, 1 mol of C₂H₄ contains 2 moles of carbon.
So, number of moles of carbon are :
n = 0.4 mol
We know, 1 mol of any atom contains 6.022 × 10²³ atoms.
So, number of carbon atoms are :
[tex]N = 0.4 \times 6.022\times 10^{23} \\\\N = 2.409 \times 10^{23}[/tex]
Hence, this is the required solution.
Find the mass of 3.66 moles of Octane C,H,8
Answer:
417.2g
Explanation:
Given parameters:
Number of moles of octane = 3.66moles
Unknown:
Mass of octane = ?
Solution:
To solve this problem;
Octane = C₈ H₁₈
Mass of octane = number of moles x molar mass
Molar mass of octane = 8(12) + 18(1) = 114g/mol
Mass of octane = 3.66 x 114 = 417.2g
Explain which has a greater impact on the kinetic energy of an object - the
object's mass or the object's speed?
Answer:
it is the objects mass, I learned this last semester
The object's mass has a greater impact on the kinetic energy of an object as it is the mass the mass on which force is exerted and in which energy is stored to be transformed in to kinetic energy.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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explain why aluminium oxide must be molten for electrolysis to take place.
Answer:
The extraction is done by electolysis but first the aluminium oxide must be melted so that electricity can pass through it...The use of molten cryolite as a solvent reduces some of the Energy
costs involved in extracting aluminum by allowing the ions in aluminum oxide to move freely at low temperature ..
What is the mass number of an atom that contains 12 protons, 14 neutrons, and 12 electrons? *
10 points
2
26
24
168
The mass number of an atom : 26
Further explanationGiven
12 protons, 14 neutrons, and 12 electrons
Required
The mass number
Solution
Inside the atom there are 3 sub-particles, namely protons, neutrons and electrons. Protons and electrons are present in the atomic nucleus while electrons move around the atomic nucleus through energy levels in the atomic shell
Atomic number = number of protons = number of electrons
Mass number = number of protons + number of neutrons
Input the value :
Mass number = 12 + 14
Mass number = 26
is hydrogen monoxide covalent or ionic
Answer:
ionic
Explanation:
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Answer:
Bird eating worm: The bird gains energy from eating its proteins.
Plant recieving sunlight: The plant gains energy from the sunlight and transfers it into sugar and energy for it to continue its cycle.
Light bulb attached to battery: The lightbulb gains electricity and power from the battery until it runs out completely.
Write a word equation for the combustion of propane???
HELP????
Answer:
1 mole of propane combines with 5 moles of oxygen gas to produce 3 mole of carbon dioxide and 4 moles of water.
Explanation:
The word equation for the combustion of propane can be obtained from the chemical equation;
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
The word equation is therefore:
1 mole of propane combines with 5 moles of oxygen gas to produce 3 mole of carbon dioxide and 4 moles of water.
For such a combustion reaction, carbon dioxide and water are produced in the process.
Based on what basis the elements had been arranged
in the modern periodic table?
A - The increase in the atomic mass
B – The increase in the atomic number
C - The classification of elements into metals and
nonmetals
D - The classification of elements according to their
Answer:
B
The increase in the atomic number
What is the resistance of a blub when the voltage across is 6 V and the current is 0.2A?
Answer:
30 Ohms (Ω)
Explanation:
Resistance = Voltage/Current
R = 6/0.2
R = 30 Ohms (Ω)
You are given 100 g of a compound. The compound is composed of 37% hydrogen and 63% oxygen. How many grams of hydrogen are present in the 100 g sample?
Select one:
a. 37 g
b. 27 g
c. 100 g
d. 63 g
There are 37 grams of hydrogen present in the 100 g sample given that compound is composed of 37% hydrogen and 63% oxygen.
MASS OF AN ELEMENT:
According to this question, a compound is said to be composed of 37% hydrogen and 63% oxygen.
This means that in 100g of the compound, its elemental constituents are as follows:
H = 37/100 × 100O = 63/100 × 100This means that hydrogen will contain 37g in 100g of the given compound.
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How can we change the forms of water.?
Answer:
By heating or freezing the water
Explanation: Hope this helps
Valence electrons are the number of
Answer:
an be found by determining the electronic configurations of elements. Thereafter the number of electrons in the outermost shell gives the total number of valence electrons in that element.
Explain how to count the number of elements in a compound
Answer:
Using the formula cards again, add the coefficient of 2 in front of the formula and have them recalculate the number of each element and the total number of atoms in each element.
Explanation:
The number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula
A compound is a substance that is a mixture of more than one elements.
Compounds are made of two or more elements. These elements are represented by their symbols. These symbols can be identified and the number of elements represented by these symbols are counted.
For example, in the compound [tex]H_2O[/tex]:
H represents Hydrogen
O represents Oxygen
The elements in Water ( [tex]H_2O[/tex]) are Hydrogen and Oxygen
Therefore, the number of elements in [tex]H_2O[/tex] is 2
Also in, [tex]NaCl[/tex]
The elements are Sodium(Na) and Chlorine(Cl)
There are two elements in NaCl
Hence, the number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula
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50 POINTS!!!
Read the sentence from the section “The Law Of Conservation Of Mass."
In a physical change, a substance's physical properties may change, but its chemical makeup does not.
Which of the following words, if it replaced the word "properties" in the sentence above, would CHANGE the meaning of the sentence?
a. possessions
b. attributes
c. characteristics
d. qualities
Answer:
A
Explanation:
what is the mass of 74.6% of chlorine