Answer: The empirical formula is [tex]NaBO_2[/tex]
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given:
Mass of Na= 34.5 g
Mass of B= 16.4 g
Mass of O = 48.6 g
Step 1 : convert given masses into moles.
Moles of Na =[tex]\frac{\text{ given mass of Na}}{\text{ molar mass of Na}}= \frac{34.5g}{23g/mole}=1.5moles[/tex]
Moles of B =[tex]\frac{\text{ given mass of B}}{\text{ molar mass of B}}= \frac{16.4g}{11g/mole}=1.5moles[/tex]
Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{48.6g}{16g/mole}=3moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Na = [tex]\frac{1.5}{1.5}=1[/tex]
For B = [tex]\frac{1.5}{1.5}=1[/tex]
For O =[tex]\frac{3}{1.5}=2[/tex]
The ratio of Na: B: O= 1: 1: 2
Hence the empirical formula is [tex]NaBO_2[/tex]
An element has three isotopes. The masses and % abundances for the isotopes are: Isotope #1 mass 38.96 amu, % abundance=93.26%, Isotope #2 mass
39.96 amu, % abundance 0.012 %, and Isotope #3 mass= 40.96 amu, % abundance=6.73 %. The average atomic mass for this element has to be
Answer:
39.095
Explanation:
this is because all this isotopes belong to a single element thus
(38.96×93.26)+(39.96×0.012)+(40.96×6.73)
answer of that divided by 100%
30 Points!
Which of the following tasks falls under the responsibility of a forensic scientist?
Cleaning the crime scene after evidence has been collected
Making the final determination as to if a suspect is, in fact, guilty of the crime
Signing search warrants
Training officers in how to collect evidence
Predict the molecular structure (including bond angles) for each of the following.
a. PCl3
b. SCl2
c. SiF4
Answer:
PCl3 - trigonal pyramidal <109 degrees
SCl2 - bent<109 degrees
SiF4 - tetrahedral 109 degrees
Explanation:
The shape of all three molecules derive from a tetrahedral arrangement of electron pairs.
However, in PCl3 there is a lone pair of electrons on P and three bond pairs. This leads to the observance of a trigonal pyramidal geometry with bond angle <109 degrees.
In SCl2, there are four regions of electron density around S, two lone pairs and two bond pairs leading to a bent molecular geometry with bond angle <109 degrees.
In SiF4, there are four bond pairs and no lone pair. The molecular geometry is tetrahedral with a bond angle of 109 degrees.
If 18.00 mL of 0.1000 M magnesium hydroxide reacts with 10.00 mL of hydrochloric acid, what is the molarity of the acid solution?
Answer:
0.36M HCl
Explanation:
The reaction of Mg(OH)₂ with HCl is:
Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O
Where 1 mole of magnesium hydroxide reacts with 2 moles of HCl
To solve this question, we need to find the moles of Mg(OH)₂ that reacted and, with chemical equation, solve for the moles of HCl and its molarity (Using the 10.00mL = 0.01000L) as follows:
Moles of Mg(OH)₂:
18mL = 0.018L * (0.100mol / L) = 0.0018 moles Mg(OH)₂
Moles HCl:
0.0018 moles Mg(OH)₂ * (2 moles HCl / mol Mg(OH)₂) = 0.0036 moles HCl
Molarity HCl:
0.0036 moles HCl / 0.0100L =
0.36M HClA 12.0% sucrose solution by mass has a density of 1.05 gem, what mass of sucrose is present in a 32.0-mL sample of this solution?
A) 0.126g
B) 3.66g
C) 4.03g
D) 3.84g
E) 280 g
Answer:
Option C. 4.03 g
Explanation:
Firstly we analyse data.
12 % by mass, is a sort of concentration. It indicates that in 100 g of SOLUTION, we have 12 g of SOLUTE.
Density is the data that indicates grams of solution in volume of solution.
We need to determine, the volume of solution for the concentration
Density = mass / volume
1.05 g/mL = 100 g / volume
Volume = 100 g / 1.05 g/mL → 95.24 mL
Therefore our 12 g of solute are contained in 95.24 mL
Let's finish this by a rule of three.
95.24 mL contain 12 g of sucrose
Our sample of 32 mL may contain ( 32 . 12) / 95.24 = 4.03 g
What is the wavelength of a 3 x 1012 Hz infrared wave?
Answer:
[tex]\lambda=10^{-4}\ m[/tex]
Explanation:
Given that, [tex]\lambda=10^{-4}\ m[/tex]
The frequency of infrared wave, [tex]f=3\times 10^{12}\ Hz[/tex]
We need to find the wavelength of infrared wave. The relation between the frequency and the wavelength is given by :
[tex]c=f\lambda[/tex]
where
c is the speed of light
[tex]\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3\times 10^{12}}\\\\=0.0001\ m\\\\=10^{-4}\ m[/tex]
So, the wavelength of the infrared wave is [tex]10^{-4}\ m[/tex].
Pro
∆G0=-RT in k Known as
Answer:
Gibbs free energy equation
Explanation:
In like manner, represent particle diagrams that account for the fact that one volume of hydrogen combines with one volume of chlorine to form hydrogen chloride. What do you suppose is the formula of hydrogen chloride?
Answer:
According to Avogadro's law which states that equal volumes of all gases under the same condition of temperature and pressure contain equal number of molecules. Therefore, one molecule of hydrogen reacts with one molecule of chlorine to yield two molecules of hydrogen chloride.
The formula of hydrogen chloride is HCl
The particle diagram is found in the attachment below.
Explanation:
The reaction between hydrogen and chlorine to form hydrogen chloride is represented by the equation below
H₂(g) + Cl₂(g) ---> 2HCl(g)
In the reaction equation above, one mole (or one volume) of diatomic hydrogen gas reacts with one mole (or one volume) of diatomic chlorine gas to form two moles (or two volumes) of hydrogen chloride gas. This is in accordance with Avogadro's law which states that equal volumes of all gases under the same condition of temperature and pressure contain equal number of molecules.
How does mass affect a star's life cycle?
O A.
The greater a star's mass, the more likely it is to burn forever.
O B.
The greater a star's mass, the more likely it is to form planets.
O c.
The greater a star's mass, the more likely it is to fuse hydrogen.
D.
The greater a star's mass, the more likely it is to become a black hole.
Answer:
A star's life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. ... As the gas spins faster, it heats up and becomes as a protostar.Explanation:
Read this and then choose your options ✍️✍️The concentration of carbon dioxide in the atmosphere has been increasing for many years. How might this increase affect photosynthesis? (15 points if answered)
Answer:
Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.
As explained by kinetic theory, what causes gas pressure? *
A:The gain of energy from the collisions of gas particles with one another
B:The loss of energy from the collisions of gas particles with one another
C:The collisions between an object and rapidly moving gas particles
D:The weight of stationary gas particles upon a unit area of an object
Answer:
i think the answer is c
Explanation:
collission
Middle school science help please. ill give brainliest
Answer:
It converts The liquid into a gas at the same temperature.
Explanation:
Answer:
it converts the liquid into gas at the same temperature
Explanation:
when heat is added to a liquid at boiling temperature it converts the liquid into gas at that same boiling temperature
please give brainliest
The red outlined elements have what major characteristics in common?
1 point
Metals, Nonmetals, and Metalloids
One major characteristic they have in common is they are metals.
The correct IUPAC name for the following molecule is: _________
a) trans-2,3-dichloro-5-methyl-2-hexene
b) trans-2,3-dichloro-5-methyl-3-hexene cis-2,3-dichloro-5-methyl-3-hexene
c) trans-4,5-dichloro-2-methyl-4-hexene cis-4,5-dichloro-2-methyl-4-hexene
Answer:
A.) trans-2,3-dichloro-5-methyl-2-hexene
Explanation:
The proposed question and structure has been attached to this answer.
The cis- and trans- isomers are used to denote the alignment of the functional groups to the carbon chain side. From the diagram, we see that:
the two chloro groups on the main compound are in opposite directions (-trans), and not the same sides (-cis)The bottom extended methyl group is on the 5th carbon as we count from left to rightthere's a total of 6 carbon atoms with 1 double bond on the second to third carbon.Hence the name trans-2,3-dichloro-5-methyl-2-hexene
Which graph shows the pressure-volume relationship expected for an ideal gas? (This is an illustration of Boyle's law.)
Question 11 options:
A)
Graph B
B)
Graph C
C)
Graph D
D)
Graph A
Answer:
D
Explanation:
The graph of Boyle's law is known as pressure-volume graph or PV curve. It is as follows:
As observed from the graph above, pressure increases with a decrease in volume, and vice versa. Thus, pressure is inversely proportional to volume. Other parameters (temperature and amount of gas) are constant in the graph above.
Volume is on the x-axis and pressure, on the y-axis. The equation of the curve is PV = k, which is the equation of Boyle's law. The curve is hyperbolic in nature having two asymptotes: P = 0 (horizontal) and V = 0 (vertical).
As volume tends to positive infinity, pressure tends to zero, and we get the horizontal asymptote, P = 0.
Horizontal asymptote, P=0
When volume approaches zero, pressure approaches infinity, and it results in the vertical asymptote, V = 0.
The graph which shows the pressure-volume relationship expected for an ideal gas is: C) Graph D.
Boyle's states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.
Mathematically, Boyle's law is given by the formula:
[tex]PV = k[/tex]
Where;
P is the pressure of an ideal gas.V is the volume of an ideal gas.For the illustration of Boyle's law using a graph, volume is represented on the x-axis while pressure is represented on the y-axis.
Generally, the graph of Boyle's law is a hyperbolic curve with two asymptotes:
P = 0 (horizontal axis).V = 0 (vertical axis).Find more information: https://brainly.com/question/1437490
What type of heat transfer occurs when you touch a metal
seat with your hand and the seat feels cold?
Answer:
heat conduction
Explanation:
Conduction :]
>-<
.
.
.
.
.
.
These allow electricity to flow easily through them (think copper and aluminum).
(Lessons 5.01-5.03)
Insulators
Electric Currents
Conductors
Resistors
Answer:
conductors
Explanation:
Humans have 50 pairs of chromosomes true or false
Answer:
False
Explanation:
humans have 23 pairs
Which sentence best describes a bond formed between two unlike atoms?
O A. The bond could form only between two atoms of very different
electronegativities.
O B. The electrons involved in the bond are shared equally between the
atoms.
O C. The bond could have been formed only as the result of ions
attracting each other.
D. The type of bond is determined by the difference in
electronegativity of the atoms.
The type of bond is determined by the difference in electronegativity of the atoms. Hence, option D is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
The ability of an atom to attract a pair of electrons in a chemical bond is called its electronegativity. The difference in electronegativity between two atoms determines how polar a bond will be.
Hence, option D is correct.
Learn more about bond here:
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what is made from a chemical reaction?
Answer:
the Product
Explanation:
What do you have to do to break a molecule?
Answer:
Heat the molecule
Explanation:
Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be heated. Then the atoms start to move, and when they move too much, the bond breaks. Molecules that require less energy to break than they give off when broken are called fuels.
How many moles are in the 100,000g of CuSO4 • 5H2O ?
Answer:
try (107.87 amu)
Explanation:
The volume of a sample of gas measured at 35 C and 1.00 atm pressure is 2.00 L. What must the final temperature be in order for the gas to have a final volume of 3.00 L at 1.00 atm pressure?
Answer:
the final temperature is 465.2k
A copper wire is left outside on the ground for several weeks. Which
statement describes a change resulting from the chemical properties of the
wire?
A. It conducts electricity when lightning strikes it.
B. It melts when heated.
C. It becomes tarnished.
D. It bends when someone steps on it.
Answer:
c
Explanation:
the oxygen in the air and water from the rain caused oxidation causing the copper wire to become tarnished.
The statement that describes a change resulting from the chemical properties of the wire is it becomes tarnished. The correct option is C.
What are chemical properties?Chemical properties are those properties that are not always shown physically, but they came out of a chemical reaction. Chemical properties are pH, solubility, toxicity, the heat of combustion, flammability, reactivity, etc.
The copper wire, when left out in the environment, becomes tarnished, due to the air and moisture present in the environment. The meaning of tarnished means it loses its luster or its quality.
Copper is a shiny, soft, and brown-colored metal. It is usually used in making wire used for electricity.
Thus, the correct option is C. It becomes tarnished.
Learn more about chemical properties, here:
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A candle made of certain wax blend burns at a rate of 44.2 mg/min. What is the value of this burn rate if expressed in grams/hour
Answer:
2.652 g/h.
Explanation:
Burn rate (in mg/min) = 44.2 mg/min
Burn rate (in m/h) =?
We'll begin by converting 44.2 mg/min to g/min. This can be obtained as follow:
1 mg/min = 0.001 g/min
Therefore,
44.2 mg/min = 44.2 mg/min × 0.001 g/min / 1 mg/min
44.2 mg/min = 0.0442 g/min
Finally, we shall convert 0.0442 g/min to g/h. This can be obtained as follow:
1 g/min = 60 g/h
Therefore,
0.0442 g/min = 0.0442 g/min × 60 g/h / 1 g/min
0.0442 g/min = 2.652 g/h
Therefore, 44.2 mg/min is equivalent to 2.652 g/h.
Thus, the burn rate (in m/h) is 2.652 g/h.
Transverse waves move the medium perpendicular
true or false
Answer:
True
Explanation:
Which of the following statements is true?
Question 10 options:
a chromosome is larger than a cell
a DNA strand is made of many chromosomes
a gene contains may chromosomes
a chromosome contains many genes
Answer:
a chromosome contains many genes
Explanation:
How many mL of 0.125 M Ba(OH)2 would be required to completely neutralize 75.0 mL of 0.845 M HCl? What is the pH of the solution at the equivalence point?
Answer:
253.5mL of Ba(OH)₂ are required to neutralize the HCl solution
The pH at equivalence point is = 7
Explanation:
The reaction of Ba(OH)₂ with HCl is:
Ba(OH)₂ + 2HCl → BaCl₂ + 2H₂O
First, we need to find moles of HCl. With these moles and the chemical equation we can find the moles of Ba(OH)₂ and the volume required:
Moles HCl:
75.0mL = 0.075L * (0.845mol / 1L) = 0.063375moles HCl
Moles Ba(OH)₂:
0.06338moles HCl * (1mol Ba(OH)₂ / 2mol HCl) = 0.03169 moles Ba(OH)₂
Volume of the 0.125M Ba(OH)₂:
0.03169 moles Ba(OH)₂ * (1L / 0.125mol) = 0.2535L are required =
253.5mL of Ba(OH)₂ are required to neutralize the HCl solution
As the titration was of a strong acid, HCl, with a strong base, Ba(OH)₂, the pH at equivalence point is = 7
Polonium-214 went through a series of radioactive decays to produce a stable isotope of bismuth-210 choose the correct decay series that would produce bismuth-210
A: Polonium-214 undergoes 2 beta decay and 1 gamma emission
B: Polonium-214 undergoes 1 alpha decay and 2 gamma emission
C: Polonium-214 undergoes 2 alpha decay and 1 beta decay
D: Polonium-214 undergoes 1 alpha decay 1 beta decay and 1 gamma emission.
The correct decay series :
₈₄Po²¹⁴⇒₈₃Bi²¹⁰+₂He⁴+ ₋₁e⁰+ ₀γ⁰
Further explanationRadioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
alpha α particles ₂He⁴ beta β ₋₁e⁰ particles gamma particles ₀γ⁰ positron particles ₁e⁰ neutron ₀n¹Decay's reaction :
₈₄Po²¹⁴⇒₈₃Bi²¹⁰+x+y+z
From this decay reaction can be concluded
mass number decreased by 4
atomic number decreased by 1
Then the most suitable are:
Polonium-214 undergoes 1 alpha decay 1 beta decay and 1 gamma emission.
₈₄Po²¹⁴⇒₈₃Bi²¹⁰+₂He⁴+ ₋₁e⁰+ ₀γ⁰
So that the mass number and atomic number are the same both before and after decay
What is the total charge of an iron nucleus
