Answer:
There are 3 isotopes of the element hydrogen.
Explanation:
hydrogen, deuterium, and tritium.
Answer:
Hydrogen has three isotopes.
Explanation:
I hope this helps!
:)
the correct electron-dot formula for a molecule of chlorine?
Answer:
Cl has 7 dots
if its Cl2; Cl-Cl it will contain 14 dots
Explanation:
The electron-dot formula of the chlorine molecule Cl₂is shown in the attached diagram below.
What is the lewis electron dot diagram?A lewis electron dot structure is used to represent the number of bonds, the bonding atoms, and the lone pairs left in the atoms in the molecule.
Lines are shown between atoms that are bonded to one another and excess electrons or lone pairs are represented as dot pairs and are placed next to the atoms.
As the valence electrons of each chlorine atom are equal to seven from the electronic configuration of the chlorine atom.
First, the total number of valence electrons in a chlorine molecule is 7 + 7 = 14.
As each chlorine atom needs only one electron to complete its octet. As the octet completes, the rest of the electrons are assigned as the lone pairs of atoms. Therefore, each chlorine atom has three lone pairs of electrons on it.
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Some species of moose are adapted to eat grasses and flowers in the summer and pine needles in the winter.
Where are these organisms adapted to live?
Deserts
Taigas
Tropical rain forests
Grasslands
Answer:
B. Taigas
Explanation:
Write 2.0 x 10^-3 in standard notation
Answer:
= 3.456 × 1011
(scientific notation)
= 3.456e11
(scientific e notation)
= 345.6 × 109
(engineering notation)
(billion; prefix giga- (G))
= 345600000000
(real number)
Explanation:
i dont know if its math or something else so here are your answers:)
Answer:
0,002
Explanation:
What is the energy of a microwave photon that has a frequency of 9.86 x 1012 Hz?
Answer:
E = 65.37×10⁻²² J
Explanation:
Given data:
Energy of photon = ?
Frequency of photon = 9.86×10¹² Hz
Solution:
Formula:
E = h.f
Here h is planck's constant its value is 6.63×10⁻³⁴ js.
E = 6.63×10⁻³⁴ js × 9.86×10¹² Hz
Hz = s⁻¹
E = 65.37×10⁻²² J
The energy of photon is 65.37×10⁻²² J.
Please help!
An astronaut orbits planet X in his spaceship. To remain in orbit at 675 km above the planet's center, he maintains a speed of 76 m/s. What is the
mass of planet X? Note: the constant of universal gravity (G) equals 6.674 X 10 ^-11 N m^2/kg^2.
A. 7.7 x 10^14 kg
B. 5.8 x 10^19 kg
C. 7.7 x 10^17 kg
D. 5.8 x 10^16 kg
Answer:
B. 5.8 × 10^19 kg
Explanation:
Describe 1 way process or system that transfers heat by convection. Be specific in details
Kinematics equation practice
Which model of the atom was used as a result of JJ Thomson's cathode ray
experiments?
a. Plum pudding model
b. Nuclear model
C. Planetary model
d. Quantum mechanical model
Answer:
a. Plum pudding model
Explanation:
The plum pudding model of the atom was proposed by J.J. Thomson. It was the model he derived from his experiment on the gas discharge tube.
J.J Thomson was the first person to discover electrons which he called cathode rays because in the discharge tube, they emanate from the cathode.
This led him to suggest the plum pudding model of the atom. The model reflects electrons being surrounded by a volume of negative charges.If an object has a density of 0.2g/ml, will it sink or float in water?
Sink
Float
Answer:
float ...(i think)
Explanation:
Which is NOT an example of an inclined plane?
Question 4 options:
A See-Saw
A screw
A slide
A ramp
Answer:
A. See-Saw
Explanation:
A see-saw is not an inclined plane but it is a lever.
A screw, ramp and a slide are all inclined planes
Simple machines help to make doing work easier. They simply help to amplify effort.
There are different types of simple machines;
the wheel and axle, the lever, the inclined plane, the pulley,d the screw, and the wedge.An inclined plane is a simple machine made up of a plane fixed at one end and then tilted at the other.
A steel cylinder for scuba diving contains 11.1 L of compressed air. The pressure inside the cylinder is
204 atm at a temperature of 24°C.
Calculate the number of moles of air in the cylinder.
Write your answer using three significant figures.
mol air
Answer:
9.28moles
Explanation:
Given parameters:
volume = 11.1L
pressure = 204atm
temperature = 24°C = 24 + 273 = 297K
Unknown:
Number of moles of air in the cylinder = ?
Solution:
To solve this problem, we apply the ideal gas equation;
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant = 0.082atmdm³mol⁻¹K⁻¹
T is the temperature
Now insert the parameters and find n;
204 x 11.1 = n x 0.082 x 297
226.4 = 24.4n
n = 9.28moles
The number of moles of air in the cylinder is 92.98 moles
From the following parameters given, we are to determine the number of moles of air in the cylinder.
Given that:
The volume of the steel cylinder = 11.1 LThe pressure inside the cylinder = 204 atmThe temperature inside the cylinder = 24°CThe number of moles of air can be determined by using the relation for the ideal gas equation which can be expressed as:
PV = nRTwhere
n = number of molesMaking (n) the subject of the formula:
[tex]\mathbf{n = \dfrac{PV}{RT}}[/tex]
[tex]\mathbf{n = \dfrac{204 \ atm \times 11.1 L}{0.082 \ L .atm/mol .K \times 297 \ K}}[/tex]
n = 92.98 moles
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Which of the following is NOT a true statement?
The amount of solar radiation emitted by the Sun varies during different Earth
seasons. UV rays are blocked by Earth’s ozone layer.
The top several meters of the ocean is the greatest absorber of solar radiation on Earth.
Snow has a greater albedo than a rain forest.
Answer:
The amount of solar radiation emitted by the Sun varies during different Earth seasons
Explanation:
What determines the number of protons in an element?
HELP WILL GIVE BRAINLIEST!!
Rank the following items from LEAST to MOST momentum.
Fast car, Parked truck, Slow car, Fast baseball, Fast feather.
Answer:
This if from lowest to highest
Parked truckSlow car (depending on its actual speed)Fast feather (depending on how its falling)Fast baseballFast car (depends on it's mph)i need a person i can love and not get hurt
Answer:
You'll find someone. There's a someone for everyone.
Explanation:
And I know how you feel.
Which group of organisms disappeared during the mass extinction at the end of the Cretaceous Period?
A. dinosaurs
B. mammoths
C. saber tooth cats
D. trilobites
Answer:
saber tooth cats
Explanation:
When water changes into water vapor, this is called
a. condensation
b. transpiration
c. precipitation
d. evaporation
Be sure to answer all parts. Show the overall reaction for formation of racemic 3−bromohexane from (E)−3−hexene by entering the structures of the products and reactants in the template provided. Part 1 out of 3 draw structure ... arr draw structure ... + draw structure ... (E)−3−hexene (S)−3−bromohexane (R)−3−bromohexane Racemic product = 50% (S) and 50% (R)
Answer:
See explanation
Explanation:
The mechanism for the formation of bromohexane from hexene has been clearly shown in the image attached to this answer.
Hexene is attacked by HBr and a carbocation is first formed as shown. The carbocation is flat and planar. it can be attacked on either face by the bromide ion.
Attack on either faces yields a racemic mixture of the R and S enantiomer as shown in the image.
You can use the mechanism shown to fill in the structures.
Kobe Bryant was recorded to have thrown a basketball 10m in 0.75 seconds. What was the ball’s speed
rip kobe Bryant rip 24
Answer:
Rip :(((
Explanation:
Im so sorry for not answering but rip kobe :(
A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lose a lot of
energy, the hydrogen bonds hold them relatively far apart. Based on this information, what can the scientist infer about the substance? (2
points)
Оа
It expands when it freezes.
Oь
It is highly colored.
Ос
It exists only as a gas.
Od
It does not dissolve ionic compounds.
Answer: The answer is: It expands when it freezes. When molecule freezes, it lose energy. When molecules are far apart, it means the volume is greater and it expands.
Explanation: its A can u also anwser my question.
Answer:
it is A
Explanation:
I did the test and got it right!
HELP ME QUICK PLSSS
Answer: Yellow is electron, green is neutron, Red is proton
Explanation:
I learned this
The relationship between Fahrenheit and Celsius is as follows: °F = °C * 1.8 + 32 If the weather forecaster says it will be 14 °F, what is that in Celsius?
Answer:
The answer is "-10° C".
Explanation:
Fahrenheit and Celsius, both use scales for measuring their temperature standard. The Fahrenheit suggests, as just a cold water point by taking 32° F and hot water rate by taking 212° F. The freezing temperature of both the water at the Celsius scale is 0° C, as well as the boiling point of its water at 100° C.
Converting the Fahrenheit to Celsius:
Formula: [tex]\bold{^{\circ}F = ^{\circ}C \times 1.8 + 32}[/tex]
°F= 14
[tex]\to 14 = ^{\circ}C \times 1.8 + 32}\\\\\to 14 -32 = ^{\circ}C \times 1.8 \\\\\to -18 = ^{\circ}C \times 1.8 \\\\\to ^{\circ}C = \frac{-18}{1.8} \\\\\to ^{\circ}C = \frac{-180}{18} \\\\\to ^{\circ}C = - 10[/tex]
Explain what lattice energy is and how it affects
the properties of ionic compounds. Describe the
general properties of ionic compounds.
Answer:
Explanation:
Lattice energy is a way to measure the bond strength in ionic compounds. Ionic compounds tend to have high melting and boiling points. Ionic compounds tend to be hard. Ionic compounds have a range of solubilities.
In which one of the following branches of natural science are properties of materials studied?
a.
Biology
b.
Chemistry
c.
Geology
d.
Astronomy
Answer:
chemistry
Explanation:
it is the study of structer, composition and change that matter undergoes
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What does a cladogram show?
A. comparison of the relative ages of organisms
B. evolutionary relationships between organism
C. comparison of species that are most similar
D. ecological relationships between organisms
Answer:
B
Explanation:
I did this and got it correct.
3(so)4 how many sulfur atoms and oxygen
Answer:
There is 3 sulfur and 12 oxygen atoms
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, in 3(SO)[tex]_4[/tex], there are 3 sulfur atom and 12 atoms of oxygen.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. In 3(SO)[tex]_4[/tex], there are 3 sulfur atom and 12 atoms of oxygen.
Therefore, in 3(SO)[tex]_4[/tex], there are 3 sulfur atom and 12 atoms of oxygen.
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An object has a mass of 20g and occupies a volume of 40 ml. Calculate the Density of the object.
Answer:
The answer is 0.5 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{20}{40} \\ [/tex]
We have the final answer as
0.5 g/mLHope this helps you
A 15.0 L tank of gas contained at a high pressure of 8.20 • 10^4 torr. The tank is opened and the gas expands into an empty chamber with a volume of 600•10^4 L. Calculate the new pressure of the gas
Answer:
P₂ = 0.205torr
Explanation:
Boyle's law relates the pressure and volume of a gas under two different conditions. The equation is:
P₁V₁ = P₂V₂
Where P is pressure and V volume of of 1, initial conditions and 2, final conditions.
P₂ is our incognite
Replacing:
P₁V₁ = P₂V₂
8.20x10⁴torr*15.0L = P₂*600x10⁴L
P₂ = 0.205torr
if the Earth can fit 1000
billion people, why is the
human carrying capacity
likely only between 10-15
billion?
Answer:
because people are not having babies fast enough
Explanation:
How does the body use energy from respiration
Answer:
Some of the energy released in respiration is used to make larger molecules from smaller ones, to enable muscles to contract and to keep temperature steady. Some of the energy released in respiration in plants is used to make amino acids and proteins. c Food provides the amino acids needed to make body proteins.
Explanation: