Answer:
C6H1206 + 6O2 > 6CO2 + 6 H2O
Explanation:
On the left side we have 6xC so we multiply CO2 by 6 to get the same amount of C.
We have 12x H on the left side, so we multiply H2O on the right side by 6 to get the same amount of H.
On the right side we have 18x O ( 6CO2 gives us 6x2x O which is 12O; and 6H2O gives us 6O. To get the same amount on the left side ( we already have 6O in C6H12O6), so we only need 12 O more. So we multiply O2 on the left side by 6. Which gives us 18x O on both sides.
So on both sides we have now:
6x C
12xH
18xO
What type of bonds hold together the atoms in an oxygen molecule?
Answer:
Covalent bond
Explanation:
Covalent bond:
"The bond which is formed by the sharing of electrons between the atoms is called covalent bond"
The covalent bond is less stronger than ionic bond so require less energy to break as compared to the energy require to break the ionic bond.
The covalent bond is present between the oxygen molecule. It is the bond which is formed by the sharing of electrons between the two atoms of oxygen. Oxygen is present in group six of periodic table so there are six valance electrons are present. Oxygen molecules is formed by sharing the two valance electrons by each oxygen atom, thus double covalent bond is present in oxygen molecules. This is represented as O=O and two lone pairs are still present on each oxygen atom.
Answer:
two covalent bonds
Explanation:
Oxygen atoms can form two covalent bonds, so to link the two oxygen atoms together, a double bond forms between them.
How does the specific heat of water affect the oceans
Answer:
Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. ... Hot water is less dense and will float on room-temperature water. Cold water is more dense and will sink in room-temperature water.
Explanation:
Answer: it keeps the temperature more even
Explanation:
What is energy that can be released as light or thermal energy in a Reaction
Answer:
In an endothermic reaction, the products have more stored chemical energy than the reactants. In an exothermic reaction, the opposite is true. The products have less stored chemical energy than the reactants. The excess energy in the reactants is released to the surroundings when the reaction occurs.
Explanation:
Final answer:
Energy released as light or thermal energy in a reaction is typically from exothermic chemical reactions, where more energy is released than required to break bonds. This occurs during the transformation of chemical potential energy into other energy forms such as heat or light.
Explanation:
The energy that can be released as light or thermal energy in a reaction is typically associated with chemical reactions. When the energy required to break the bonds in reactants is less than the energy released when new bonds form in products, the reaction is known as exothermic. Chemical energy, which is stored in the bonds of molecules, is a form of potential energy. During exothermic reactions, this energy is released as either heat or light, which can be observed, for example, as a flame on a kitchen burner fueled by natural gas. If the reaction absorbs more energy than it releases, it is called an endothermic reaction.
A graduated cylinder contains 17.5 ml of water. When a metal cube is placed onto the cylinder, it’s water level rises to 20.3 ml. What is the volume of the cube cm3
Answer:
20.3-17.5=2.8ml 1ml=1cm3 vol= 2.8cm3
Explanation:
The volume of the metal cube is calculated by subtracting the original volume of water in the cylinder (17.5 ml) from the volume after the cube was placed in the cylinder (20.3 ml), resulting in a cube volume of 2.8 cm³.
Explanation:The volume of the metal cube that was placed in the graduated cylinder can be calculated from the change in water level. At the beginning, the cylinder contained 17.5 ml of water. When the metal cube was placed into the cylinder, the water level rose to 20.3 ml. The volume of the cube in cubic centimeters (cm³) or milliliters (ml), since 1 cm³ = 1 ml, can be determined simply by subtracting the original volume of water from the final volume.
So, the calculation is as follows: 20.3 ml - 17.5 ml = 2.8 cm³. Therefore, the volume of the metal cube is 2.8 cm³.
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2. Circle the letter of each sentence that is true about numbers expressed in
scientific notation.
a. A number expressed in scientific notation is written as the product of a
coefficient and a power of 10.
b. The power of 10 is called the exponent.
c. The coefficient is always a number greater than or equal to one and less
than ten.
d. For numbers less than one, the exponent is positive.
Answer:
I think it is b) NOT SURE
Explanation:
Which of the following Period 4 elements would be most li
form a cation?
A. K (IE, = 419 kJ/mol)
B. Ge (IE, = 762 kJ/mol)
C. Br (IE, = 1140 kJ/mol)
D. Kr (IE, = 1351 kJ/mol
Answer:
K
Explanation:
The key aspect in this question is to look for Ionization Energy (EI), which describe the needed energy to take out an electron. Thefore, the potasiumm need lower energy . Another important thing is analyze how K will take nobel gas electron configuration when loss 1 electron, this It will be more stable
Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?
Atoms are tiny indivisible particles.
The atoms of any one element are different from those of any other element.
Compounds are made by combining atoms.
Atoms of different elements can combine with one another in simple whole number ratios.
Answer:
Atoms of different elements can combine with one another in simple whole number ratios
All the given statements are first proposed by John Dalton. But the one think that atoms are tiny indivisible particles had to be revised because of the discovery of subatomic particles electrons, protons and neutrons.
What is an atom?An atom is the basic unit of every substance in the universe. Atoms are made up of a nucleus and electrons. Nucleus is composed of positively charged protons and neutral particles neutrons.
There were many theories addressing the structure of atom in which the first significant one was Dalton's theory. According to this theory, Atoms are tiny indivisible particles.
The atoms of any one element are different from those of any other element. Compounds are made by combining atoms. Atoms of different elements can combine with one another in simple whole number ratios.
Later J.J thomson discovered electrons and Rutherford discovered protons and revolving nature of electrons around the nucleus. It was Niels Bohr who proposed the modern theory for atomic model and with the aid of this theory electronic properties of atoms were studied more.
Therefore, the indivisibility of atoms proposed by Dalton was wrong and thus option A is correct.
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What is the volume of a salt crystal measuring 1.64 x 10^-2m by 1.5 x 10^-2m by 4.8 x 10^-3
Answer:
V = 1.2 × 10⁻⁶ m³
Explanation:
Volume is equal to length × width × height, since we are given these measurements in the question we can simply plug our numbers into the formula.
V = l × w × h
V = 1.64 x 10⁻² × 1.5 x 10⁻² × 4.8 x 10⁻³
V = 1.2 × 10⁻⁶ m³
To calculate the volume of a salt crystal, multiply its three dimensions: 1.64 × 10^-2 m, 1.5 × 10^-2 m, and 4.8 × 10^-3 m. The resulting volume is 1.18 × 10^-6 cubic meters. This method uses basic multiplication of the crystal's dimensions.
Volume Calculation of a Salt Crystal
To find the volume of a salt crystal, you need to multiply its three dimensions together. The dimensions provided are 1.64 × 10-2 m, 1.5 × 10-2 m, and 4.8 × 10-3 m.
Here's the volume calculation step by step:
First dimension: 1.64 × 10-2 mSecond dimension: 1.5 × 10-2 mThird dimension: 4.8 × 10-3 mNow multiply these values together:Volume = 1.64 × 10-2 m × 1.5 × 10-2 m × 4.8 × 10-3 m = 1.18 × 10-6 m3
Therefore, the volume of the salt crystal is 1.18 × 10-6 cubic meters.
what are some chemical properties of a rock?
Final answer:
Chemical properties of rocks include their ability to react with acids, undergo oxidation, and release substances under certain conditions; they define how rocks interact chemically with their environment.
Explanation:
Chemical Properties of Rocks
Chemical properties are characteristics of a substance that describe its potential to undergo certain chemical changes during reactions. In the context of rocks, these properties are crucial in understanding how they will interact with the environment. For instance, some common chemical properties of rocks include their reactivity with acids, ability to undergo oxidation, and potential to emit substances when exposed to various conditions.
Iron within rocks, for example, has the chemical property of reacting with oxygen and water to form rust, also known as iron oxide. This reaction is a form of corrosion and represents a significant chemical change. Another example is the reaction of calcite, a common mineral in limestone rocks, with acids; this results in the rock fizzing as carbon dioxide gas is released. Many rocks contain minerals that can react to cause a distinct chemical reaction, and identifying those reactions is essential for studying and classifying different rock types.
how many moles of particles in ethanol
Answer:
In this case, ethanol's molecular mass is 46 g/mol. This means that in 1 mol of ethanol, there are 46 g, thus the term molecular mass and molar mass are often used interchangeably. The same is true of a mole. A mole of anything is 6.022 x 1023 of that item
Explanation:
Answer:
9 moles of particles are present in 1 mole of ethyl alcohol.
Explanation:
1. Ethanol is ethyl alcohol with the chemical formula [tex]C_2H_5OH[/tex]
2. Molecular formula is given by [tex]C_2 H_6 O[/tex]
3. [tex]1 C_2 H_6 O_1[/tex]
4. 1 represents 1 mole of ethyl alcohol
5. Subscripts represents the number of moles of each element.
6. 2 moles of carbon atoms, 6 moles of Hydrogen atoms and 1 mole of oxygen atoms are present in 1 mole of ethyl alcohol.
7. So, totally 9 moles of particles are present in 1 mole of ethyl alcohol
8. 1 mole contains [tex]6.022\times10^{23}[/tex] particles or atoms or molecules or ions
9. For example 1 mole of [tex]H_2 O[/tex] contains [tex]6.022 \times 10^{23} H_2O[/tex] molecules (contains 2 moles of H and 1 mole of O atoms )
10. 1 mole of Na contains [tex]6.022 \times 10^{23}[/tex] Na atoms
11. 1 mole of [tex]CaCO_3[/tex] contains [tex]6.022\times 10^{23}CaCO_3[/tex] molecules (1 mole of Ca, 1mole of C and 3 moles of O atoms )
12. 1 mole of [tex]Na^+[/tex] contains [tex]6.022 \times 10^{23} Na^+[/tex] ions
Which element is a d block element?
A) S
B) Ar
C) Ag
D) As
E) None of these elements is a d block element.
Answer:
Option C : Ag
Electronic configuration:
47Ag: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d9
The d-block elements are present in the middle of periodic table between s and p-block elements. d-block elements are also called Transition elements. Their valance electrons are reside in the d orbitals. They have more electropositive character than p-block elements but less than s- block elements.
Final answer:
The d block element among the given choices is Ag (silver), which is part of the second transition series, making the correct answer C) Ag.
Explanation:
The element that is a d block element among the choices provided is Ag (silver). This is because d block elements comprise the groups 3 through 12 on the periodic table, which are also known as the transition metals.
According to the division of the d block elements, silver (Ag) falls into the second transition series. S (sulfur) and Ar (argon) are p block elements, while As (arsenic) is also a p block element. Therefore, the correct answer is C) Ag.
Hydrogen reacts with sodium to produce solid sodium hydride. A reaction mixture contains 6.75 g Na and 3.03 g Hydrogen. Which reactant is limiting?
Answer:
Na
Explanation:
To find the limiting reactant we must first write the balanced chemical reaction. It must be correctly balanced so that we can find the proper mole ratios.
2 Na + H₂ → 2 NaH
After this we will convert our measurements to moles. For mass we do this by dividing by the molar mass.
6.75g ÷ 22.99 = 0.294mol Na
3.03g ÷ 2.02 = 1.50mol H₂
Now that we have the moles of each of the reactants, we can multiply them by their mole ratio with a reactant.
0.294mol Na × [tex]\frac{2 Na}{2 NaH}[/tex] = 0.294mol NaH
1.50mol H₂ × 2/1 = 3.00mol NaH
Na is our limiting reagent because it makes the smaller amount of moles.
When glucose is consumed, it reacts with oxygen in the body to produce carbon dioxide, water, and energy. How many grams of carbon dioxide would be produced if 45g of C6H12O completely reacted with oxygen
Answer:
There will be produced 66g of CO2 if 45g of glucose completely reacted with oxygen
Explanation:
Step 1 : Balance the formula
Oxidation of glucose can be shown in the following equation :
C6H12O6 + 6 O2 → 6 CO2 + 6H2O
This means that for 1 mole glucose that react there will react 6 moles of O2, to form 6 moles of CO2 and 6 moles of H2O
Step 2: Calculating moles
mole glucose = 45g / Molar mass glucose
⇒ Molar mass = 6*12 + 12*1 + 6*16 = 72 + 12 + 96 = 180g/mole
⇒ mole glucose = 45g / 180g/mole
⇒mole glucose = 0.25 mole
Since 1 mole of glucose is used to form 6 moles of CO2
0.25 mole of glucose is used to form 1.5 moles of CO2
Step 3 : Calculating mass of Carbon dioxide
Mass of CO2 = 1.5 moles of CO2 * 44 g/mole
mass of CO2 = 66g
There will be produced 66g of CO2 if 45g of glucose completely reacted with oxygen
If 45g of glucose reacts with oxygen, 66.015 grams of carbon dioxide would be produced. This calculation is based on converting the mass of glucose to moles, using the stoichiometry of the balanced chemical equation, and then calculating the mass of CO2 produced.
Explanation:When glucose (which has the chemical formula C6H12O6) is consumed, it reacts with oxygen to produce carbon dioxide, water, and energy. The chemical equation for this reaction is C6H12O6 + 6 O2 → 6 CO2 + 6 H2O. Given that 45g of C6H12O6 completely reacts with oxygen, we need to calculate the mass of carbon dioxide produced from this reaction.
To do this, we first need to determine the molar mass of glucose, which is 180.16 g/mol. This means that 1 mole of glucose weighs 180.16 grams. We can then find out how many moles of glucose 45g represents by dividing 45g by 180.16 g/mol, which gives us 0.25 mol of glucose.
According to the chemical equation, 1 mole of glucose produces 6 moles of CO2. Therefore, 0.25 moles of glucose would produce 0.25 × 6 = 1.5 moles of CO2. The molar mass of CO2 is 44.01 g/mol, so the mass of CO2 produced by 0.25 moles of glucose is 1.5 moles × 44.01 g/mol, resulting in 66.015 grams of CO2. So, if 45g of C6H12O6 completely reacted with oxygen, 66.015 grams of CO2 would be produced.
Choose all the answers that apply.
Sound _____.
can travel through a vacuum
travels in longitudinal waves
is caused by vibration
travels most slowly through a gas
speeds up when temperature is increased
Answer: False, True, True, True, True
Explanation:
Sound can travel through a vacuum.
False. Sound requires a medium (solid, liquid, or gas) to travel through. It cannot travel through a vacuum because there are no particles in a vacuum to transmit the sound waves.
Sound travels in longitudinal waves.
True. Sound waves are indeed longitudinal waves, which means the particles in the medium vibrate parallel to the direction of the wave.
Sound is caused by vibration.
True. Sound is produced by the vibration of particles in a medium, which creates compressions and rarefactions that propagate as sound waves.
Sound travels most slowly through a gas.
True. Sound generally travels more slowly through gases compared to liquids and solids because the particles in gases are more spread out, leading to a lower transmission speed.
Sound speeds up when the temperature is increased.
True. In general, the speed of sound increases with an increase in temperature. This is because an increase in temperature typically leads to an increase in the speed of the particles in the medium, allowing sound waves to propagate more quickly.
So, the correct statements are 2, 3, 4, and 5.
Suppose that a fictitious element, X, has two isotopes: 59X (59.015 amu) and 62X (62.011 amu). The lighter isotope has an abundance of 81.7%. Calculate the atomic mass of the element X.
Answer:
Atomic Mass of Element = 59.57 amu
Given Data:
Element X Isotope 1 atomic weight = 59.015 amu
Element X Isotope 2 atomic weight = 62.011 amu
The abundance of lighter isotope = 81.7%
Atomic Mass of Element X = ?
Solution:
81.7% is the abundance of element that is lighter so it is the of the isotope having weight 59.015 amu
Then the remaining abundance = 100 -81.7 = 18.3 %
18.3 % abundance of the isotope weight = 62.011 amu
Formula:
Mass of the element = % of abundance (atomic mass of Isotope 1) + % of abundance (atomic mass of Isotope 2)
Put the values
Atomic mass of Element X = 81.7/100 (59.015) + 18.3 /100 (62.011)
Atomic mass of Element = 0.817 (59.015) + 0.183 (62.011)
Atomic mass of Element = 48.22 + 11.35
Atomic Mass of Element = 59.57 amu
The force of gravity between Tim and John is 1.85 x 10^-9 N. If they are 18 m apart and Tim has a mass of 120 kg, what is John’s mass ?
Answer:
75kg
Explanation:
Given:
Force of gravity(F) = 1.85 x 10⁻⁹N
distance between Tim and John = 18m
Mass of Tim = ?
Unknown:
Mass of John = ?
Solution
Newton's law of universal gravitation states that every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of the masses of the particles and inversely proportional to the square of the distance between them.
i.e
F =G[tex]\frac{m_{1} m_{2}}{r^{2} }[/tex]
let
m₁ represent mass of Tim
m₂ mass of John
G is the universal gravitation constant = 6.67 x 10⁻¹¹Nm²kg⁻²
r is the distance seperating them
The unknown is m₂ and we should make it the subject of the expression:
m₂ = F [tex]\frac{r^{2} }{m_{1} }[/tex] x [tex]\frac{1}{G}[/tex]
m₂ = [tex]\frac{1.85 x 10^{-9} x 18^{2} }{G x 120}[/tex]
m₂ = 75kg
Which two Chemists organized elements based on properties such as how the elements react or whether they are solid on
liquid?
Lavoisier and Mendeleev
Dobereiner and Newlands
Newlands and Mendeleev
Lavoisier and Dobereiner
Lavoisier and Dobereiner
I hope this helps!
Answer:
Lavoisier and Dobereiner is the correct answer.
Explanation:
Lavoisier and Dobereiner two Chemists organized elements based on properties such as how the elements react or whether they are solid onliquid.Lavoisier and Dobereiner are the scientists who have done an important contribution to the periodic table.Johann Wolfgang Dobereiner found the occurrence of classes of elements with alike chemical properties.Lavoisier made major contributions made to understand the chemical properties in the periodic table.In baking biscuits and other quick breads, the
baking powder reacts to release carbon
dioxide bubbles. The carbon dioxide bubbles
cause the dough to rise. is this chemical or physical
Answer:
Chemical
Explanation:
Chemical changes are when a substance combines with another in order to form a new substance. In this instance the baking powder is reacting which creates carbon dioxide bubbles.
The release of carbon dioxide that results in the rising of bread is an example of a chemical change.
What are chemical changes?
There is always a specific chemical or physical shift that goes along with changes in energy. A natural environment undergoes a variety of changes, including water evaporation, condensation, rainfall, and more. All of these modifications imply a change in state. Some reactions result in the breakdown of existing bonds in the reactants and the formation of new bonds in the products.
Chemical changes occur when the molecular makeup is totally changed and a new product is created. New products are created via chemical modifications. Chemical alterations are both permanent and irreversible.
It demonstrates that modifying or tweaking the experimental modifications cannot undo a chemical change. During a chemical reaction, the substance's mass changes. The mass is either added or subtracted.
Therefore the release of carbon dioxide that results in the rising of bread is an example of a chemical change.
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What isotope symbol can be represented by, 7p+,7e,7n0 ?
Answer:
¹⁴N isotope
Explanation:
7p⁺ are representing the number of protons in the nucleus
7n° are representing the number of neutrons in the nucleus
7e⁻ are representing the number of electrons
If we add the number of protons and the number of neutrons we get a mass number of 14 which is the atomic mass of the nitrogen-14 isotope.
Answer:
N¹⁴
Explanation:
Each element has its own properties, and those properties can be seen by their atomic number and proton number. However, there are types of atoms called isotopes, and these atoms have a different number of neutrons compared to its standard atom. For example, the standard atom of carbon is carbon-12, however, there are isotopes of carbon that have more neutrons, making them heavier. Examples of such isotopes are carbon-13 and carbon-14.
In this question, we are looking for an atom with has 7 protons and 7 electrons. Scanning the periodic table of elements, we can see that nitrogen is the only atom with 7 protons, hence in a neutral atom of nitrogen, there are 7 protons and 7 electrons. The atomic mass can be calculated by adding the number of protons and the number of neutrons together, so the atomic mass for this isotope is:
Protons + Neutrons = Atomic Mass
= 7 + 7
= 14
The isotope represented by 7p+ 7e-, 7n0 is nitrogen-14 (N¹⁴).
( I need answer ASAP plz) Describe one similarity and one difference between lead-204 and lead-208.
Answer:
Their similarity is that they have the same number of protons. Their difference is that they have different number of neutrons.
Explanation:
They are isotopes of the same element.
The density of water is 1.00 g/cm3. The density of ice is 0.92 g/cm3. By what percent is the volume increased when water is frozen at 0°C? What is the final volume if 500 mL of water is completely frozen?
Answer:
At the same temperature of 0°C, the density (mass per volume) of ice is 0.9187 gram per cubic centimeter (g cm-3 or g/cm3) while that of liquid water is 0.9998 g cm-3 (Cohen et al. 2003). The lesser density means that ice contains lesser mass (quantity of matter) per unit of volume. It also means that the molecules of water are less compressed per unit volume of ice. Another way of saying it is that ice is less compact than liquid water having the same volume.
Answer:
Volume increase by 8.70% and volume of 500 mL of water when completely frozen is 543 mL
Explanation:
Density is the ratio of mass to volumeLet's say there are m g of water. So volume of m g of water is equal to [tex]\frac{m}{1.00}cm^{3}[/tex] or [tex]m cm^{3}[/tex]If m g of water is completely frozen to ice then volume of m g of ice is equal to [tex]\frac{m}{0.92}cm^{3}[/tex]So, percentage of increases in volume = [tex]\frac{(\frac{m}{0.92})-(m)}{m}\times 100[/tex] % = 8.70 %Mass of 500 mL of water = [tex](1.00g/cm^{3})\times 500cm^{3}=500g[/tex] ([tex]1mL=1cm^{3}[/tex])So volume of 500 mL of water when it is completely frozen = [tex]\frac{500g}{0.92g/cm^{3}}=543cm^{3}=543 mL[/tex]PLZZ HELP! Why is hydrogen and oxygen not a physical property of water ?
Answer:
They aren't physical properties of water because it's the chemical formula of water, H2o, or hydrogen and oxygen.
Explanation:
Examples of the physical property of water are Boiling Point, Freezing Point, Surface Tension, Heat of Vaporization, and Vapor Pressure, Viscosity, Cohesion, it's Solid, Liquid and Gas state.
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what is √200 in simplest form?
Answer:
14.14
If you round it I'm guessing it would be 14.
Good luck <3
Answer:
10√2
Explanation:
Amenda's 12.0-gal tank is filled with E85 fuel. The density of E85 is 0.758g/ml. What is the volume in liter of the E85 fuel
Answer:
45.4249 L
Explanation:
E85 is the mixture of gasoline and ethano. It consist of 15 percent gasoline and 85 percent ethanol.
Given data:
volume = 12 gal
density = 0.785 g/ ml
volume in L = ?
Solution:
1 gal = 3.78541 L
12× 3.78541 = 45.4249 L
Different kinds of wood have different densities. The density of american white oak wood is generally 0.77 g/cm3. If Jim grabs a 38.5 cm3 piece of wood out of his pile of materials, what would the mass be if that pile was all american white oak?
Answer:
m= 29.645 g
Explanation:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Given data:
density of wood = 0.77 g/cm³
volume= 38.5 cm³
mass= ?
Solution:
d= m/v
m= d × v
m= 0.77 g/cm³× 38.5 cm³
m= 29.645 g
Final answer:
The mass of a 38.5 cm3 piece of American white oak wood from the pile would be 29.645 g.
Explanation:
The density of American white oak wood is generally 0.77 g/cm³.
To calculate the mass of a 38.5 cm³ piece of wood from the pile, we can use the formula:
Mass = Density x Volume
Therefore, the mass of the wood would be: 0.77 g/cm³ x 38.5 cm³ = 29.645 g.
How many grams of O are in 905 grams of Na2O?
To find the number of grams of O in 905 grams of Na2O, we calculate the molar mass of Na2O and O. Then, we use the ratio of moles of O to Na2O to calculate the number of moles of O. Finally, we multiply the number of moles of O by the molar mass of O to find the grams of O.
Explanation:To calculate the number of grams of O in 905 grams of Na2O, we need to find the molar mass of Na2O and the molar mass of O. The molar mass of Na2O is 46 grams/mol (2*23 for Na + 16 for O) and the molar mass of O is 16 grams/mol.
In Na2O, there are 2 moles of Na for every 1 mole of O. So we can calculate the number of moles of O in 905 grams of Na2O by dividing 905 grams by the molar mass of Na2O, and then multiplying by the ratio of moles of O to moles of Na2O:
Number of moles of O = (905 grams Na2O / 46 grams/mol Na2O) * (1 mole O / 2 moles Na2O) = 9.85 moles O
Finally, we can calculate the number of grams of O by multiplying the number of moles of O by the molar mass of O:
Number of grams of O = 9.85 moles O * 16 grams/mol O = 157.6 grams O
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A container was found in the home of the victim that contained 130 g of ethylene glycol in 380 g of liquid. What was the percentage of ethylene glycol?
Final answer:
The percentage of ethylene glycol in the solution is calculated to be 34.21% by mass, which is obtained by dividing the mass of ethylene glycol by the total mass of the solution and then multiplying by 100.
Explanation:
The percentage of ethylene glycol in the solution can be calculated using the mass percentage formula, which is the mass of ethylene glycol divided by the total mass of the solution, then multiplied by 100 to convert it into a percentage. In this case, we have 130 g of ethylene glycol and a total solution mass of 380 g. The calculation would be:
Percentage of ethylene glycol = (Ethylene glycol mass / Total solution mass) × 100
Percentage of ethylene glycol = (130 g / 380 g) × 100
Percentage of ethylene glycol = 0.3421 × 100
Percentage of ethylene glycol = 34.21%
Therefore, the solution contains 34.21% ethylene glycol by mass.
Density refers to a physical property that is measured using a ratio of _________ divided by _______ so that two objects of the same size can still have very different density. A. weight, height B. mass, volume C. concentration, mass D. height, width
Answer:
B. mass, volume
Explanation:
Density refers to a physical property that is measured using a ratio of mass divided by volume so that two objects of the same size can still have very different density.
Answer: Option (B) is the correct answer.
Explanation:
Density of a substance is defined as mass divided by its volume.
Mathematically, Density = [tex]\frac{mass}{volume}[/tex]
So, density is proportional to the mass of substance. Hence, an increase in mass will lead to increase in density of the substance also.
Whereas density is inversely proportional to volume of a substance. Hence, an increase in volume will lead to a decrease in density of the substance.
Therefore, we can conclude that density refers to a physical property that is measured using a ratio of mass divided by volume so that two objects of the same size can still have very different density.
What does a decrease in temperature indicate about the molecules in a sample of liquid water? (3 points)
Group of answer choices
Decreased kinetic energy of the molecules
Decreased chemical energy of the molecules
Increased chemical energy of the molecules
Increased kinetic energy of the molecules
Answer: Decreased kinetic energy of the molecules
The first option that is given in the question is the correct option.
Explanation:
The molecules of a substance act differently at different temperatures but we know that its energy is dependent on the temperature at which it is present. The normal tendency of molecules is to vibrate on move around but, when it absorbs a certain amount of heat it gains more energy and tends to move around faster.
And just the other way round happens when heat is lost so we can say with a decrease in temperature the activity of molecules will also decrease and hence the kinetic energy will be decreased.
Answer:
Increase chemical energy of the molecules
Explanation:
Because once you change temperature it will have a chemistry reaction
A. What will the sun turn into when it runs out of fuel for fusion? (5 points)
Answer:
The sun will heat up and expand into a Red Giant star, then heat up to an extreme temperature, explode, and compact into an even hotter white dwarf star.
Explanation:
when our Sun runs out of hydrogen fuel, it will expand to become a red giant, puff off its outer layers, and then settle down as a compact white dwarf star, then slowly cooling down for trillions of years.
Answer:
White dwarf
Explanation:
Sun is a G-2 average mass star. It is 4.56 billion years old and would live for another 5 billion years. When the Sun would run out off fuel, its outer layers would expand and it will form a red giant star. The outer layers would eventually blow off into space and the remaining core would become a white dwarf. White dwarf is an electron degenerate star.