Answer:
A
Explanation:
Bc ik
The number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron is not true about one mole.
What element of one mole is false?It is untrue to say that one mole of fluorine gas weighs more than one mole of oxygen gas. Fluorine gas has a molar mass of 38 grams per mole, whereas oxygen gas has a molar mass of 32 grams per mole, based on their relative molar masses.
A mole of a substance is equal to 6.022 × 10²³ of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is referred to as "Avogadro's number" or "Avogadro's constant."
Since boron has a different molar mass than carbon, the statement that there are the same number of atoms in each mole is untrue.
The ratio of the substance's mass to its molar mass is used to express the number of moles of an element.
Moles = Mass/Molar mass
Given that the molar masses of carbon and boron differ, the statement that the number of atoms in a mole of carbon is equal to the number of atoms in a mole of boron is false.
Therefore, the correct answer is option c) the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron.
The complete question is:
Which of the following is not true about one mole?
a) the mass of 1 mole of carbon atoms = the mass of
b) 1 mole of boron atoms
one mole contains 6.02 x 1023 particles
c) the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron
d) 12 g of carbon equals one mole of carbon atoms
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can someone please help me solve this? i dont understand this problem :(
Answer:
–4020 KJ
Explanation:
The following data were obtained from the question:
H₂(g) + F₂(g) —> 2HF(g) ΔH = –536 KJ
Next, we shall determine the mass of H₂ that reacted from the balanced equation to produce –536 KJ of heat energy. This can be obtained as follow:
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 1 × 2 = 2 g.
Summary:
From the balanced equation above,
2 g of H₂ reacted to produce –536 KJ of heat energy.
Finally, we shall determine the heat change produced by the reaction of 15 g of H₂. This can be obtained as follow:
From the balanced equation above,
2 g of H₂ reacted to produce –536 KJ of heat energy.
Therefore, 15 g of H₂ will react to produce = (15 × –536)/2 = –4020 KJ of heat energy.
Thus, the heat change for the reaction is –4020 KJ
Match each atomic particle with the correct charge.
1. proton neutral
2. neutron positive
3. electron negative
The proton is a postitive charge, therefore, being 1 (proton) matched to positive. Whilst neutron (2) is matched to neutral. Thus electron (3) is matched to negative.
An object has a mass of 26.94 grams and a volume of 2.568 cubic centimeters. What material is it likely to be
made of?
Substance iron gold silver copper
Density (g/cm) 7.874 19.32 10.49 8.92
a. Silver
c. Iron
b. Gold
d. Copper
Answer:
a) silver
Explanation:
Given data:
Mass of object = 26.94 g
Volume of object = 2.568 cm³
Which subject is this = ?
Solution:
Formula:
d = m/v
by putting values
d = 26.94 g/ 2.568 cm³
d = 10.49 g/cm³
Densities of objects: g/cm³
iron = 7.874
gold = 19.32
silver = 10.49
copper = 8.92
Thus, given object is silver.
Structural formula of 2 ethyl, 4 methyl-Heptane
PLEASE HELPPP!!!!!! ASAP!!!!
Which of the following best describes cations? Question 19 options: A) They're negatively charged because they lost an electron. B) They're positively charged because they gained an electron. C) They're positively charged because the number of electrons remained the same. D) They're positively charged because they lost an electron.
Answer:D
Explanation:trust me bro
Answer:
D
Explanation: I took the test
What three types of particles make up an atom? What are their charges?
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Answer:
Protons, positive charge
Neutrons, neutral
Electrons, negative charge
Explanation:
In which highlighted section of the periodic table in the diagram provided above are the elements whose atoms have 1 valence electron located?
A) a
B) b
C) c
D) d
Answer:
B.
Explanation:
PLZ HELP!
Why do we use ramps (inclined planes) to help us move objects?
Plz nothing from the internet :D
5. Describe the effects of photons of light on an electron of the hydrogen atom
Answer:
How do atoms give off light?
Atoms emit light when they are heated or excited at high energy levels. The color of light that is emitted by an atom depends on how much energy the electron releases as it moves down different energy levels. ... It shows the electron moving down energy levels.
Explanation:
8. __H2 + __O2-> __H2O
9. __K2SO4 + __H2-> __H2SO4 + __K
10. __NO2 + __H2O-> __HNO3 + __NO
Anser:
Explanation:
hope this helps
Which feature does an iron metal have?
O electrons that transfer between atoms to make cations and anions
O a sea of electrons
O firmly bonded electrons
O electrons shared between single pairs of atoms
Answer:
a sea of electrons
Iron metal has a sea of electrons.
Iron metal is an element which possesses a sea of electrons as a result of it
containing cations which are usually surrounded by electrons which move at
a very fast pace .
This property makes Iron metal to be reactive when exposed to air( oxygen)
and it then forms various compounds such as Iron(II) oxide, Iron(III) oxide and
rust.
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what kind of chemical bond is established in hydrochloric acid?
Answer and Explanation:
HCl, also known as hydrochloric acid, has a covalent bond. The hydrogen (H) atom shares an electron with the chlorine (Cl) to form the bond.
Compare and contrast atoms and molecules. Cite specific examples from the readings, as well as what you may already know, to support your comparison.
Answer:
The main difference between an atom and a molecule lies in the size: while the atom is the smallest unit into which matter can be divided into any of its states, a molecule is the union of a group of atoms, that is, this composed of several atoms. Thus, for example, a water molecule is composed of two hydrogen atoms and one oxygen atom (H2O). Therefore, it can be said that atoms are the smallest unit in which the chemical elements of the world can be divided, while molecules are the particles of matter that are formed through the combination of these elements.
If you find a chemical in the lab and are unsure of
its identity, what is the best way to find out what it
is?
Answer:
C. read the label on the container
Explanation:
What information is found in an SDS? Check all that apply.
A. the identification of the chemical
C. the chemical and physical properties of the substance
D. the first-aid measures to take if an accident occurs involving the chemical
Answer:
C
Explanation:
just did it
List 3 particles of an atom (w/their symbol & charge)
Answer:
there are three fundamental particles of atom
which are :
proton ( positively charged (+) )electron ( negatively charged ( - ) )neutron ( having no charge on it ( neutral ))Particle Symbol
electron =》e-
proton =》p+
neutron =》n°
27.2Pb(NO3)2 --> 2Pb0 + 4NO2 + O2
O A. Synthesis
B. Single displacement
C. Decomposition
D. Combustion
How would you describe the appearance of homogeneous mixture? A. Homogeneous mixtures do not have a uniform composition. B. Homogeneous mixtures have a uniform appearance. C. Homogeneous mixtures are not distributed evenly. D. Homogeneous mixtures have two phases
Answer:
i think its c somebody correct me if im wrong. but hope this help
Explanation:
Which safety procedure could prevent an accident?
using a fire extinguisher
using glass without chips or cracks
smelling a mixture of chemicals
getting a bandage out of the first aid kit when bleeding
Answer:
B
Explanation:
define the clinical thermometer
Answer:
a small medical thermometer with a short but finely calibrated range, for taking a person's temperature.
Answer:
Thermometer which are used in clinical to measure the temperature of human body is called clinical thermometer.
Explain five physical and/or chemical properties that you need to consider for the substances before using them as construction materials for buildings
Answer: There are many properties of a metal which is taken into consideration when it is used for construction
Explanation:
The properties can be physical, chemical, et cetera. The physical properties that is considered are:
1. Durability: It can be defined as the property of the material to withstand the atmospheric pressure and other factors.
2. Density: The ratio of mass by volume of a material (homogeneous material) is called as density.
3. Fire resistance: The ability of the material to withstand in fire without changing its size or shape.
4. Weather resistance: The ability of the material to withstand the weather which could be variable round the year.
5.Water absorption: The ability of the material to absorb water and retain it.
How is carbon(C)-14 is different from carbon(C)-12?
Explanation:
Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms. Atoms of both isotopes of carbon contain 6 protons. Atoms of carbon-12 have 6 neutrons, while atoms of carbon-14 contain 8 neutrons.
what is cell explain in a paragraph
Answer:
Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function. Cells are the basic structures of all living organisms. Cells provide structure for the body, take in nutrients from food and carry out important functions.
How many elements, compounds and atoms are in CH3COOH
I don't really understand this worksheet question.
One of the steps to sweeten sour gas using the Claus process is reacting
hydrogen sulfide gas with sulfur dioxide gas to produce water vapour and sulfur.
16 H2S(g) + 8 SO2(g) → 16 H2O(g) + 3 Sg(s)
8.56 kL of hydrogen sulfide at 175 kPa and 250 °C reacts with excess sulfur
dioxide. Calculate the mass, in kg, of sulfur produced.
The mass, in kg, of Sulfur produced : 2.072 kg
Further explanationGiven
V = 8.56 kL = 8560 L
P = 175 kPa = 1,73 atm
T = 250 + 273 = 523 K
Required
mass of Sulfur produced
Solution
mol of H₂S :
[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.73\times 8560}{0.082\times 523}\\\\n=345.3[/tex]
mol of Sulfur based on mol H₂S as a limiting reactant( excess Sulfur dioxide)
From equation, mol ratio H₂S : S = 16 : 3, so mol S :
[tex]\tt \dfrac{3}{16}\times 345.3=64.74[/tex]
Mass S(Ar = 32 g/mol) :
= mol x Ar s
= 64.74 x 32
= 2071.68 g = 2.072 kg
Answer these three please! Thank you <3333
(I will give brainliest)
Answer:
Explanation:
21:B 22:B
Select the correct answer from each drop-down menu.
Researchers stationed at different areas on a mountain and in a tunnel midway through the mountain boiled water at the same time. Even though the water at every station was at the same temperature, the pot at the top of the mountain started boiling before the others. Why?
Water boils when the vapor pressure is
the atmospheric pressure. The atmospheric pressure
at the top of the mountain.
Water boils when the vapour pressure is least the atmospheric pressure.
The atmospheric pressure is equal at the top of the mountain.
What is atmospheric pressure?The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth.
As we go up in altitude the air pressure becomes less. When the pressure decreases, it takes less energy to get the water molecules to escape the surface. So the temperature is less than it would be at sea level.
Air pressure is higher or greater at the bottom of a mountain. This is because the height of the air above that level is thicker than at the top.
Pressure is given by the equation, P=rho*g*h, where rho is the air density, g is the gravity value and h is the thickness of the air layer on top of the level where we are considering the pressure.
Therefore, as we can see, at the bottom of the mountain, the thickness h of air is greater, and so is the pressure.
Hence, water boils when the vapour pressure is least the atmospheric pressure and the atmospheric pressure is equal at the top of the mountain.
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Write one paragraph to summarize Strengths and Weaknesses of Acids and Bases.
Answer:
Explanation: I can't give you the answer you with the sentence but i will help you the best i can
One qualitative measure of the strength of an acid or a base solution is the pH scale A logarithmic scale that relates the concentration of the hydrogen ion in solution.
Write the ionic equation, including state symbols, for the reaction between zinc and iron(II) sulfate
Answer:
Fe (s) + Cu^2+ (aq) + SO4^2- (aq) --> Cu (s) + Fe^2+ (aq) + SO4^2- (aq)
Explanation:
The creation of carbon monoxide is an effect. What is one cause?
A. the regrouping of the atoms in table salt
B.the burning of fossil fuels
C.cleaning swimming pools
D.operating a stove
Answer:
Your answer is going to be B. the burning of fossil fuels
Explanation:
This is because carbon monoxide is extremely toxic for us humans. An example of this could be pollution. Hope this helps! :)