Answer:
Its 19.
Explanation:
K (potassium) has 19 electron according to the atomic number in the periodic table. The atomic number tells you the number of protons and electrons.
A pot of water is heated on a gas-flame stove and begins to boil. Which two
transfers of thermal energy involved in this system are examples of radiation?
A. From the burner to a nearby spoon
B. In the surrounding air as air currents develop
I C. From the burner to air that is not touching it
D. From the water to the air
Answer:
a.) & d.)
Explanation:
It should ideally go from Mechanical, Electrical, thermal, light then chemical. I attached a similar example to better explain it.
The two transfers of thermal energy involved in this system are examples of radiation are From the burner to a nearby spoon and From the water to the air Hence, option a & d are correct
What is Heat Transfer ?
Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems.
Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.
According to given question, Energy should ideally go from Mechanical, Electrical, thermal, light then chemical.
Therefore, The two transfers of thermal energy involved in this system are examples of radiation are From the burner to a nearby spoon and From the water to the air Hence, option a & d are correct
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All isotopes of sodium (Na) must have,
Answer:
11 protons and 11 electrons.
Explanation:
Na is a neutral element and element number 11.
This means that it has 11 protons and 11 electrons.
In order to create an isotope, you would add or get rid of neutrons to get different mass numbers but the same element. The number of protons and electrons would remain the same.
the chemical formula 4N2O has how many atoms of each element?
Answer:
8;1
Explanation:
eight nitrogen and one oxygen
Please answer this, im too lazy to do the experiment.
1. What happened to the heavier materials in a mixture when left undisturbed?
2. How can we separate liquid and heavier particles in a mixture?
3. What materials are attracted by the magnet?
Explanation:
(1) heavier materials sink to the bottom of the mixture
(2)use a filter funnel and filter paper (filtration method)
(3) ferromagnetic materials (typically metals)
relate the concepts of isotope and mass number
Answer:
Explanation:
Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. ... A property closely related to an atom's mass number is its atomic mass.
How many moles would 9.02 x 10^25 molecules of HCI equal?
Answer:
The answer is 149.83 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 9.02 × 10^25 molecules of HCI
We have
[tex]n = \frac{9.02 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 149.83388704...[/tex]
We have the final answer as
149.83 molesHope this helps you
(PLS HELP!) Explain the layout of the modern periodic table, including rows, columns, groups, and blocks. Be sure to explain what’s in each part of the periodic table.
Answer: The rows of the periodic table represent the highest energy level of that element.
The columns represent how many valence electrons that element has.
Groups are the same thing as columns, they represent how many valence electrons am element has.
The blocks of the periodic table represent what sublevel(s) the valence electrons fill.
Explanation: Yes
Answer:
I can help!
Explanation:
Blocks
Atomic symbol is the one- or two-letter symbol for each element.
Atomic number is the number of protons in the nucleus, which determines the order of elements on the periodic table. This is also the total number of electrons in neutral atoms of the element.
Atomic mass is the mass in grams of 1 mole of atoms. Note that 1 mole contains 6.022·1023 atoms.
Groups
The first two groups of the periodic table(Alkali metals and Alkali Earth metals) are the s-block. Note that helium, in the last column of the table, is also part of the s-block. The outermost electrons of these elements are in s orbitals.
The transition metals make up the d-block, with electrons filling d orbitals. The lanthanides and actinides make up the f-block, with electrons filling f orbitals.
Groups 13 through 18,(post transition metals, metalloids, Reactive nonmetals, and Noble gases-)except for helium, make up the p-block. The outermost electrons of these elements are in p orbitals.
Sections
Metals are more likely to lose valence electrons
nonmetals are more likely to accept electrons.
Metalloids may act like metals or nonmetals, either losing or gaining valence electrons depending on the situation.
Transition metals(groups 3-12) behave somewhat differently because they can lose electrons from their outermost s or d orbitals.
Noble gases are the elements in group 18 that don’t tend to react with other elements. Noble gases have completely filled outer electron shells, as you can see because they’re at the end of each period. The electrons in these elements are stable, making the elements unreactive.
Periods and Groups
Groups of elements have similar properties in terms of how they react with other elements.
All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
Hope this helps!!
Which pair of substances would most likely result in the production of a solid when reacting with a base?
Answer:
metal salts, and carbon dioxide
Explanation:
Which element family is all 2-
Answer:
Alkaline Earth Metals
Explanation:
:)
Zn + 2HCl--------------> Zn Cl2 + H2
This is ______________________ kind of reaction.
Answer:
Single displacement (Substitution)
Explanation:
List 3 problems that can be solved with magnets
Answer:
- Failed internal wiring
- reaching a hard to get metal item
- keeping a item on a metal surface
Explanation:
Please give me BRAINLIEST :))
please help if you can. thank you.
What do you think is the difference between a scientific theory and law?
Answer:
A scientific theory predicts why something might happen and when more information goes into the theory it can better predict. But a law is something that no matter what will always be true.
Explanation:
Which refers to the number of wavelengths that pass a fixed point in a second?
wavelength
O amplitude
frequency
O compression
Please hurry will give brainliest on 10 mins
Answer:
frequency
Explanation:
The number of wavelengths that pass through a fixed point in a second is called the frequency of the wave. It has the unit of Hertz. Hence, option C is correct.
What is frequency ?The term that refers to the number of wavelengths that pass a fixed point in a second is frequency.
Frequency is a fundamental concept in wave motion and is defined as the number of complete cycles of a wave that occur per unit time. For example, the frequency of a sound wave is measured in hertz (Hz) and is equal to the number of sound wave cycles that occur per second.
The higher the frequency of a wave, the more cycles occur in a given period of time. Wavelength, on the other hand, refers to the distance between two adjacent points on a wave that are in phase with each other, such as the distance between two crests or two troughs.
Wavelength and frequency are related, and the frequency of a wave is inversely proportional to its wavelength. As the frequency of a wave increases, its wavelength decreases.
Amplitude refers to the maximum displacement of a wave from its equilibrium position, while compression is a region in a longitudinal wave where the particles are close together. Hence, option C is correct.
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The three main types of RNA are ____________________, _____________________, and ______________.
Answer:
There are three main types of RNA: messenger RNA, ribosomal RNA, and transfer RNA.
Explanation:
Messenger RNA (mRNA), Ribosomal RNA (rRNA), and Transfer RNA (tRNA).
how do i know if the particles are monatomic or diatomic or tri-atomic or tetratomic
Explanation:
Monaotomic:- the elements that have only one atom in molecule are called monaotomic elements. they are stable. Example:-Ne,Ar all are noble gases
Diatomic:-the elements that have two atoms are called diatomic molecules. Example:- Oxygen
Triatomic:-the elments that have three atoms are called tri-atomic elements they are unstable. Ex.ozone
Help
I think that is C ?
6th grade help me pleaseee
Answer:
D hope this helps
Explanation:
Answer:
d. what will happen to the freezing point of the water if salt is added?
Alveolar air (a mixture of nitrogen, oxygen, and carbon dioxide) has a total pressure of 0.998 atm. If the partial pressure of oxygen gas is 0.198 atm and the partial pressure of nitrogen gas is 0.770 atm, what is the partial pressure of carbon dioxide in millimeters of mercury?
Answer:
The partial pressure of carbon dioxide is 22.8 mmHg
Explanation:
Dalton's Law is a gas law that relates the partial pressures of the gases in a mixture. This law says that the pressure of a gas mixture is equal to the sum of the partial pressures of all the gases present.
In this case:
Ptotal=Pnitrogen + Poxygen + Pcarbondioxide
You know that:
Ptotal= 0.998 atmPnitrogen= 0.770 atmPoxygen= 0.198 atmPcarbondioxide= ?Replacing:
0.998 atm=0.770 atm + 0.198 atm + Pcarbondioxide
Solving:
Pcarbondioxide= 0.998 atm - 0.770 atm - 0.198 atm
Pcarbondioxide= 0.03 atm
Now you apply the following rule of three: if 1 atm equals 760 mmHg, 0.03 atm how many mmHg equals?
[tex]Pcarbondioxide=\frac{0.03 atm*760 mmHg}{1 atm}[/tex]
Pcarbondioxide= 22.8 mmHg
The partial pressure of carbon dioxide is 22.8 mmHg
Please help it’s due today I will give brainliest
1st and 4th options are suitable answers, as these 2 changes are not exactly physical changes as it cant return back to original form and as well as its not cooling, so I feel its 1st and 4th options
A beaker with a pale liquid in it massed 84.2 grams on a digital balance. Its volume read 42mL
Answer:
320 ml
Explanation:
How do you calculate the energy, in joules, of a photon of ultraviolet light with a frequency of 6.8 x 10^15 Hz?
Answer:
E = 45.08×10⁻¹⁹j
Explanation:
Given data:
Energy of photon in joule = ?
Frequency of photon = 6.8×10¹⁵ Hz
Solution:
Formula:
E = h.f
f = frequency
h = planck's constant (6.63×10⁻³⁴Js)
E = energy
Value of planck's constant is 6.63×10⁻³⁴Js.
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz
Hz = s⁻¹
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹
E = 45.08×10⁻¹⁹j
Energy is the quantitative unit, which is measured in joules. The energy of a photon of UV light having the frequency 6.8×10¹⁵ Hz is 45.08×10⁻¹⁹ Joules.
Given:
Frequency of photon = 6.8×10¹⁵ Hz
Energy of a photon in joule =?
Usingt the formula of energy:
E = h x v
where,
v = frequency
h = planck's constant (6.63×10⁻³⁴Js)
E = energy
Substituting the values in the equation, we get:
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹
E = 45.08×10⁻¹⁹ Joules
Therefore, the energy of a photon in the UV region is 45.08×10⁻¹⁹ Joules
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Divide the numbers
2
2
+
2
2
=
4
5
2
2
+
2
2
=
4
x
5
22+22=54x
1
+
2
2
=
4
5
1
+
2
2
=
4
x
5
1+22=54x
2
Divide the numbers
again
1
+
2
2
=
4
5
1
+
2
2
=
4
x
5
1+22=54x
1
+
1
=
4
5
1
+
1
=
4
x
5
1+1=54x
3
Add the numbers
1
+
1
=
4
5
1
+
1
=
4
x
5
1+1=54x
2
=
4
5
2
=
4
x
5
2=54x
4
Multiply all terms by the same value to eliminate fraction denominators
2
=
4
5
2
=
4
x
5
2=54x
5
⋅
2
=
5
⋅
4
5
5
⋅
2
=
5
⋅
4
x
5
5⋅2=5⋅54x
5
Simplify
Multiply the numbers
Cancel multiplied terms that are in the denominator
1
0
=
4
10
=
4
x
10=4x
6
Divide both sides of the equation by the same term
7
Simplify
Show less
Solution
5
2
=
Answer:
This is not a question
Explanation:
no
I need help on this problem. I need it answered ASAP
Use this formula: Density = Mass/Volume
Given in the question:
Mass: 10g
Volume: 5cm3
The calculations:
Density = Mass/Volume
= 10/5
= 2g/[tex]cm^{3}[/tex]
Therefore, the density will be 2g/[tex]cm^{3}[/tex]
what is the mass of 9.6 x10^23 atoms of iron?
According to the Avogadro's number, the mass of 9.6 x 10²³ atoms of iron is 89.002 g.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Therefore,mass=9.6×10²³×55.84/6.023×10²³=89.002 g
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Question 4(5 points)
(01.07 MC)
A student compares the boiling point of substances having different intermolecular forces. Which independent variable did the student most
likely use? (5 points)
Ob
Various compounds made of different forces between molecules
Type of source used to heat up the substances
Type of container used for the substances
Boiling points of various substances
Od
Answer:
Various compounds made of different forces between molecules
Explanation:
In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter in order to effect a measurable response.
According to this question, a student compares the boiling point of substances having different intermolecular forces. This means that the student uses different substances with different intermolecular forces and measures the boiling point of each, which depends on the intermolecular forced in them. Hence, the independent variable in this experiment is the VARIOUS COMPOUNDS MADE OF DIFFERENT FORCES BETWEEN MOLECULES.
True or False - The central nervous system allows us to sense the environment.
Answer: no
Explanation: they tell the organs what to sense.
what are two transition metals that start with the letter R
Answer:
Ruthenium and Rhodium
Explanation:
Which statement describe global warming? Select 2 answer choices
Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere
Which of the following can cause the substance to change phase? Select all that apply.
change in temperature
change of shape
change in mass
change in pressure
Answer:
a and d
Explanation: