Answer:
Density = 0.32g/mL
Explanation:
Density of a substance can be calculated using the formula:
Density (g/mL) = mass (g)/volume (mL)
According to the information provided in this question, mass of the substance = 80grams, volume = 250cm³/mL
Note that, the pressure and temperature are not needed to calculate the density of the substance.
Density = 80/250
Density = 0.32g/mL
Which of the following gases was NOT part of Earth’s original atmosphere?
Answer:anser choices
Explanation:
Answer:oxygen hahah
Explanation:
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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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
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.
is hydrogen monoxide covalent or ionic
Answer:
ionic
Explanation:
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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:
Balance this equation and pick the answer with the coefficients that belong there
Answer:
The answer is 2, 3, 6, and 1
Explanation:
Write down the coefficients of 2, 3, 6, and 1. Try them out and then multiply the atoms together.
2AlBr3 = Al2Br6
3K2SO4 = K6(SO4)3
6KBr = K6Br6
1Al2(SO4)3 = Al2(SO4)3
Al2Br6 + K6(SO4)3 = K6Br6 + Al2(SO4)3
All the reactants and products have the same number of atoms/molecules in each element. Therefore, this equation is balanced.
So the final answer is 2, 3, 6, and 1.
Hope it helped!
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 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.
what is the mass of 74.6% of chlorine
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
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
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
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
Anybody wanna help me with number 22? (Chemistry)
Answer:
Rutherford atomic model of atom
Explanation:
lord lutherford
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.
How can we change the forms of water.?
Answer:
By heating or freezing the water
Explanation: Hope this helps
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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.
Calculate the oxidation number of Cao
Answer:+2 -2
Explanation:
What is the molar mass of the following compound: Mg2Ba?
Answer:
2(mass no of magnisium)+mass of barium
plug in the values
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?
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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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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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:
What is energy
O The ability to do work.
O renewable particles
O stored particles
moving particles
whats the definition of efflorescence?
Answer:
efflorescence is the migration of a salt to the surface of a porous material, where it forms a coating.
Answer: Efflorescence is a crystalline or powdery deposit of salts often visible on the surface of concrete, brick, stucco, or natural stone surfaces. It occurs when water leaves behind salt deposits on the masonry surface.
Explanation: NO EXPLANTATION SORRY!
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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