Answer:
E = 12.92 × 10^(-16) J
Explanation:
Formula for energy is;
E = hc/λ
Where;
h is Planck's constant = 6.63 x 10^(-34) J.s
c is speed of light = 3 × 10^(8) m/s
λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m
E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))
E = 12.92 × 10^(-16) J
The energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
When copper is bombarded with high-energy electrons, X rays, with a wavelength of 0.154 nm (λ) are emitted.
We can calculate the energy (E) associated with the photons of these X rays using the Planck-Einstein relation.
[tex]E = \frac{h \times c }{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times 10^{8}m/s ) }{0.154 \times 10^{-9} m } ]= 1.29 \times 10^{-15} J[/tex]
where,
h: Planck's constantc: speed of lightThe energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
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Knowing how fossils form, do you think it’s likely that humans will ever piece together a complete fossil record for every species that ever existed on Earth? Why or why not?
Answer:
yes
Explanation:
since humans dig out the earth for resources o believe that fossils far every species that exists and is extinct will be found and will be pieced together
whats the most abundant isotope of silver?
Answer:
Ag-107 has an abundance of 51.82% and mass of 106.9 amu
Explanation:
Answer:
Naturally occurring silver ( 47Ag ) is composed of the two stable isotopes 107Ag and 109Ag in almost equal proportions , with 107Ag being slightly more abundant ( 51.839 % natural abundance ) .
Hope this helps
Explain why the several different types of microscopes are all necessary.
What is the difference between the crest and the trough of a wave?
Answer:
Trough is the lower bound of wave, while the crest is the upper bound of a wave.
Explanation:
see picture attatched
What is the relationship between the volume of a gas and the Kelvin temperature (at
constant pressure)?
They are the same.
They are inversely proportional to each other
They are directly proportional to each other.
They are independent of each other.
Does light take up space?
Answer:
no
Explanation:
light is a form of energy so it doent have matter therefore it doent take up sapce
How many atoms of aluminum are in a molecule of magnesium aluminum oxide (Al2MgO4)?
Answer:
12
Explanation:
The temperature of a sample of water changes from 10°C to 20°C when the water absorbs 100 calories of heat. What is the mass of the sample?
Answer:
10 g
Explanation:
Right from the start, just by inspecting the values given, you can say that the answer will be
10 g
.
Now, here's what that is the case.
As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of
1 g
of that substance by
1
∘
C
.
Water has a specific heat of approximately
4.18
J
g
∘
C
. This tells you that in order to increase the temperature of
1 g
of water by
1
∘
C
, you need to provide
4.18 J
of heat.
Now, how much heat would be required to increase the temperature of
1 g
of water by
10
∘
C
?
Well, you'd need
4.18 J
to increase it by
1
∘
C
, another
4.18 J
to increase it by another
1
∘
C
, and so on. This means that you'd need
4.18 J
×
10
=
41.8 J
to increase the temperature of
1 g
of water by
10
∘
C
.
Now look at the value given to you. If you need
41.8 J
to increase the temperature of
1 g
of water by
10
∘
C
, what mass of water would require
10
times as much heat to increase its temperature by
10
∘
C
?
1 g
×
10
=
10 g
And that's your answer.
Mathematically, you can calculate this by using the equation
q
=
m
⋅
c
⋅
Δ
T
, where
q
- heat absorbed/lost
m
- the mass of the sample
c
- the specific heat of the substance
Δ
T
- the change in temperature, defined as final temperature minus initial temperature
Plug in your values to get
418
J
=
m
⋅
4.18
J
g
∘
C
⋅
(
20
−
10
)
∘
C
m
=
418
4.18
⋅
10
=
10 g
Which of the following elements form +1 ions?
A sodium, magnesium, aluminum
B strontium, magnesium, calcium
C lithium, sodium, potassium
Answer:
It is 'A' i.e., Sodium magnesium, aluminium
Elements tend to lose and gain electrons to achieve electronic stability. Lithium, sodium, and potassium are the elements that form +1 ions. Thus, option C is correct.
What are cations?Cations are said to be the ions formed by donating their outermost valence electron that in return results in a positive charge on the element. Cations are said to be formed when the electron is more in number in the valence shell.
The electronic configuration is given as:
Lithium - 2, 1Sodium - 2, 8, 1Potassium - 2, 8, 8, 1Here, there is one electron extra in the outer shell of the atom that can be donated to other atoms that are called anions (electron acceptors). Li, Na, and K can donate one electron each and hence will acquire a +1 charge.
Therefore, option C. lithium, sodium, and potassium form a +1 charge.
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An increase in which of the following would increase the boiling point of a
liquid?
Answer:
The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.
QUICK I’ll GIVE BRAINLIEST
The number of isomers of C5H12 is:
Select one:
a. 4
b. 2
c. 5
d. 3
Answer:
The answer is option D 3
Explanation:
please mark as brainliest
Answer:
d.3
Explanation:
(EASY!!) What is the name for this structure?
Answer:
ccc
Explanation:
yeah
Answer:
uhh I can't really tell- it looks like a lot of things
Explanation:
it kind of looks like a trapezoid or maybe a "gun" I haven't really seen a shape of this kind- so I'm going to say either one of those answers. sorry if I wasn't much help (◞‸◟ㆀ)
How many grams of sulfuric acid contain 32 g of
oxygen atoms?
Answer:
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms because each molecule of oxygen contains two oxygen atoms.
Explanation:
NEED HELP PLEASE
Part A:
In your own words, describe the process of a physical change.
Part B:
What is the difference between a physical change and a chemical change? Give an example of each.
Answer:
Part A:
A physical change is a change of a substance from one form to another without changing its composition.
Part B:
A physical change is a change of a substance from one form to another without changing its composition. Example: A balloon deflating into its original form.
A chemical change occurs, one substance combines with another substance to make something completely new. Example: Making and baking a cake.
Explain why warm air temperature has lower air pressure than cold air?
Answer:
Differences in temperature cause differences in air density. Warmer air is less dense than cold, which is why warm air tends to rise and cold air sinks.
temparature affects particles. warm particles are more spread out.
Explanation:
. Being acted on by gravity, colder, denser air weighs more and exerts greater pressure per unit area.
How many neutrons does protium have?
According to Maslow's hierarchy of needs, the basic needs are what we call physiological or biological needs. The survival of the individual relies on these basic needs. Looking at it this way, before you can meet any of the needs going up the hierarchy, one needs to be healthy or at least functional optimally to even get started. All other needs are considered secondary until the basic needs have been me
Answer:
True
Explanation:
|ndeed, Psychologist Abraham Maslow's sought to describe hierarchy in which the average (or most) humans place their needs. In other words, he believes we as humans have basic needs which we long to satisfy.
On the ranking or hierarchy, according to Maslow the need humans satisfy first is their physiological need. Here's the full hierarchy:
Physiological Needs
↓
Safety Needs
↓
Love/Belonging Needs
↓
Esteem Needs
↓
Self-Actualization
How many cesium atoms are in 21.9 grams?
Which refers to the measure of the amount of water vapor in the air?
Answer:
humidity
Explanation:
Given the unbalanced reaction: NH3 + O2 N2 + H2O. When properly balanced, the sum of the balancing coefficients is 8. 12. 15. 14.
First balance the equation:
4NH3 + 3O2 ↔ 2N2 + 6H2O
Check that the equation is balanced properly by checking the numbers of each element are equal:
LS
N - 1x4 = 4
H - 3x4 = 12
O - 2x3 = 6
RS
N - 2x2 = 4
H - 2x6 = 12
O - 1x6 = 6
Given the equation is balanced properly, we can find the sum of the coefficents by adding.
4 + 3 + 2 + 6 = 15
Therefore, the sum of the coeffiecents is 15.
(b) Define, in terms of oxidation state, the Oxidizing agent
a substance which gains oxygen
a substance whis lose hydrogen
a substance which experiences a decrease in oxidation state
a substance which experiences an increase in oxidation state
Answer: a substance whis lose hydrogen
Explanation:
Can someone please help me with a science question?????
Answer:
yes
Explanation:
Sciences Grad Bosch Law of Conservation of Mass - Assess it
contents
Target: 10/2001
Science and Enging
Achemical reaction takes place in a closed system. The mass of the reactants before the reaction was
55 watte mass of the products of the reaction be according to the law of conservation
Properties of Matter
Answer:
55
Explanation:
According to the law of conservation properties of Matter in a closed system the mass of reactants is equal to the mass of products. Because there is no lose of matter or energy in closed system
The chemical formula for glucose, a type of sugar, is C 6H 12O 6. Which statement is true about glucose?
Answer:
The answer is C, Glucose is a compound, because it is made of more than one element.
Explanation:
Complete Question is ;
The chemical formula for glucose, a type of sugar, is C₆H₁₂0₆. Which statement is true about glucose?
1) Glucose is a compound because it's made from more than 1 element
2) Glucose is an element because it's made up from more than one kind of atom.
3) Glucose is an element because it can be separated.
4) glucose is a compound because is made of protons, neutrons and electrons
Solution ;
The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
What is an Element ?Aan element made entirely of one species of atoms, or an atom which has a specific number of protons in its nucleus.
Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
Three substances make up glucose: carbon, hydrogen, and oxygen. They are set at a fixed ratio of 1:2:1.
Covalent bonds, in which two atoms share bonding valence electrons in one or more bonds, are used to bind these atoms together.
Therefore, The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
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An acid-base reaction can also be classified as what "type" of chemical
reaction?
Answer: neutralization reaction
Explanation:
An acid-base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, such as water, H2O) or electrically charged (ions, such as ammonium, NH4+; hydroxide, OH−; or carbonate, CO32−).
which of the data sets qualitative data?
Answer:
any data should work as long as you get the question right it should be all fine if you i had this question once and i different sums of data each or each way i did it.
5. An atom has 6 protons, 6
neutrons and 6 electrons.
Another atom has 6 protons,
7 neutrons and 6 electrons.
Are these two atoms the
SAME atom or DIFFERENT
atoms?
i need helppppp
Answer:
it is the same
Explanation:
the atom with 7 neutrons is the isotope of the atom of 6 neutrons. they share the same chemical behaviour but they differ in atomic masses and physical properties
Delta H in chemistry means????
Answer:
In chemistry, the letter "H" represents the enthalpy of a system
Explanation:
what is a likely oxidation
state of Chlorine?
a)-1
b) 7
C) -7
d) +1
Answer: a) -1
Explanation:
How many atoms are there in 4.13 moles of nickel (Ni)
Answer:
2.48626 x 10^24
Explanation:
We multiple 4.13 by avogadro's number to get that.
