Answer:
Exposure to oxygen (especially when combined with sunlight) alters the molecular structure of lignin, causing a change in how the compound absorbs and reflects light, resulting in the substance containing oxidized lignin turning a yellow-brown color in the human visual spectrum.
The difference between an element and a compound is that:
a compound only contains one type of atom
one is chemically combined and one is only physically combined
ΟΟΟΟ
a compound is just a different name for an element
an element only contains one type of atom
Answer:the element contain only one type of atomic while the cpd contain more than two types of atoms
Explanation:
Which describes any compound that has at least one element from group 17?
halide
noble gas
metalloid
transition metal
Answer:
A) Halide
Explanation: I promise, I made a 100 :)
Answer:
Halid!
Explanation:
i took the test
Heat energy is necessary for evaporation to occur. Energy is used to break the bonds that hold water molecules together, which is why water easily evaporates at the boiling point. In fact the process of the evaporation removes heat from the environment . Which of these every day examples illustrates how evaporation removes heat from the environment ?
Answer:
As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization. Water has a heat of vaporization value of 40.65 kJ/
Explanation:
3.6 x 10^-3/2.1 x 10^6= 1.7 x 10^9
Answer:
(3.6×10^(-3))/(2.1×10^6) = 1.7×10^9 = False
Explanation:
If an atom has 16 protons, 14 neutrons, and 18 electrons. What is the
charge of the nucleus? *
Answer: negative
Explanation:
There are two more electrons than protons so the charge is -2.
A diver is going through ocean search-and-rescue training. The graph shows the relationship between her depth and the time in seconds since starting her dive.
A. What details can you determine about the dive from the coordinates of the point (5, −8)?
Answer:
The answer is below
Explanation:
The graph is attached. The time in seconds (s) is plotted on the x axis and the depth in feet (ft) on the y axis.A positive depth is used to represent above the water and a negative depth means below the water.
From the graph, the point (5, -8) is the maximum depth in which the diver has traveled. This means that at 5 seconds, the diver was 8 feet below the water. After 5 seconds, the diver start to swim ul\p
what is the answer to this question?
Answer:
highlight the key words
Explanation:
conjunctions
Answer:
dont know but hey it is me ur freind lol
Explanation:
10. In which of the following is the symbol for the ion and the total number of electrons it contains given correctly?
A Al3+ has 16 electrons
B S2- has 2 electrons
C Br1- has 34 electrons
D Ca2+ has 18 electrons
9. Which total mass is the smallest?
A The mass of 2 electrons
B The mass of 2 neutrons
C The mass of 1 electron plus the mass of 1 proton
D The mass of 1 neutron plus the mass of 1 electron
8. After measuring the ratio of the charge of a cathode ray particle to its mass, Thomson concluded that the particles
A Had no mass
B Had a very small mass
C Had a very large mass
D Carried a positive charge
Answer:
10. D
9. A
8. A or B
Explanation:
10. Calcium has 20 electrons, but the Calcium ion has 18 electrons.
9. The mass of electrons are negligible.
8. Electrons have a very small mass where some consider it to have no mass.
The "Atomic Number" is another way to refer to: a the number of atomic mass units b the number of neutrons c the number of electrons d the number of protons
Answer:
D. The number of protons.
1. Based on this graph, how does metal A differ from metal B?
A Metal A is have higher density than metal B.
B. Metal B has higher density than metal A.
C. Both metals A and B have the same density.
D. None of the abaove.
Answer:
B.Metal Bhaskar higher density than metal A
Victoria grows the same bacteria in 20 petri dishes. She places 10 of the dishes in a container with a normal atmosphere. The remaining dishes she places in a container in which the oxygen level is double the normal level. She labels the first group "A" and the second group "B." Which statement best describes the groups?
Answer:
There are no options but the question can be answered based on general understanding of experimentation.
Group A: Control group
Group B: Experimental group
Explanation:
In an experiment, there are two groups viz: the control group and the experimental group. A control group is the group that does not receive any experimental treatment. It is considered the normal group while the experimental group is the group that is subjected to experimental treatment.
N.B: The experimental treatment in this case is the "Oxygen level"
According to the question, out of 20 petri-dishes used to grow bacteria, half (10) of the petri-dishes were placed in a container with normal atmosphere while the other 10 petri-dishes were placed in another container that have double the normal oxygen level. The first group of bacteria labelled GROUP A are the CONTROL GROUP because they were not given any treatment i.e placed under normal conditions while GROUP B are the EXPERIMENTAL GROUP because they are the group that received the experimental treatment (increased oxygen level).
Express 0.107 g to centigrams.
Answer:
10.7
Explanation:
1 gram is equal to 100 centigrams
so, multiply
-What number is 66.3% of 56?
-Find a number so that 25.5% of it is 10.
Answer:
17
39.21
Explanation:
plz like and give it rating it would help a lot to me
lead has a density of 11.3 g/ml, If you weigh an empty beaker and it weighs 245.61 g then add lead until the scale reads 350.52 g what is the volume of lead that you have?
Answer:
9.28ml
Explanation:
The density of Lead (Pb) can be calculated using the formula:
Density (g/ml) = Mass (g) / Volume (ml)
According to the question, the empty beaker weighs 245.61 g, then weighed 350.52 g when lead was added to it. This means that the mass of lead in the breaker is: 350.52 g - 245.61 g = 104.91 g
Hence, mass of lead= 104.91g, density of lead= 11.3g/ml
Volume = mass / density
Volume = 104.91/11.3
Volume= 9.284
Hence, the volume of lead is 9.28ml
What is in the space between electrons?
Answer:
The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum. ... Electrons are thus 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself.
20 POINTS As a part of a laboratory investigation, Emily measured the volume of water in a graduated cylinder. Which of the choices correctly identifies the volume of water in the graduated cylinder? A. 38 mL B. 35 mL C. 37 mL D. 36.5 mL
Answer:
A.
Explanation:
Answer:
Actually both of ya are incorrect, it would be D. 36.5 mL, on study island it says that.
Explanation:
any observation must be measurable as well as...
A pure sample of a hydrocarbon is found to be 74.5% carbon by mass. What is the empirical formula of this compound?
Answer:
THE EMPIRICAL FORMULA FOR THE PURE HYDROCARBON IS CH4
Explanation:
A pure hydrocarbon contains carbon and hydrogen
Percentage composition of carbon = 74.5 %
Percentage composition of hydrogen = 25.5
In order to calculate the empirical formula of this hydrocarbon, you follow these couple of steps.
write out the percentage composition and divide by the relative atomic mass of the respective constituents.
Carbon = 74.5 / 12 = 6.2083
Hydrogen = 25.5 / 1 = 25.5
Next is to divide the values by the lowest factor
Carbon = 6.2083 / 6.2083 = 1
Hydrogen = 25.5 / 6.2083 = 4.1
Next is to write the empirical formula:
C H4
In conclusion the empirical formula for the pure hydrcarbon is CH4
Which of the following defines the wavelength of a wave? A. the distance between peaks of a wave B. the speed that a wave is passed from particle to particle C. the loudness of waves that travel through the air D. the height of a wave between peak and trough
Answer:
D.the wavelength of a wave is the distance between two successive peaks or two successive troughs or a peak and trough
Answer:
My answer to the question is wavelength is the distance between two successful cress or successful troughs of a wave. which will be option A.
. Un cuerpo irregular se introduce dentro de una probeta que inicialmente tiene un volumen de 20 ml como muestra la figura Después de la experiencia podemos afirmar que * El volumen del cuerpo es 3 ml. El volumen del cuerpo es cero. El volumen del cuerpo es igual al iniciar la experiencia. El volumen del cuerpo es 24 ml.
Answer:
El volumen del cuerpo es el mismo al comienzo de la experiencia.
Explicación:
El volumen del cuerpo es el mismo al principio porque el volumen no cambia si la temperatura permanece igual. Si cambiamos la temperatura i. mi. Al aumentar la temperatura, las moléculas comienzan a expandirse y se produce un aumento de volumen mientras que cuando disminuimos la temperatura, las moléculas de esa sustancia comienzan a contraerse y el volumen de esa sustancia disminuye. Entonces concluimos que el volumen depende de la temperatura.
100 POINTS A graph of gas pressure versus the number of particles in a container is a straight line. Which other relationship will have a similar graph? volume versus pressure, because they are also directly proportional volume versus temperature, because they are also directly proportional volume versus pressure, because they are also inversely proportional volume versus temperature, because they are also inversely proportional
Answer:
volume versus temperature, because they are also directly proportional
Explanation:
you can trust me
Answer:
volume versus temperature, because they are also directly proportional
Explanation:
the guy below me was correct
which would be isotopes?
Answer:
e
Explanation:
Why do some elements that are classified as metals not look metallic?
Answer:
So, that students like us get confuse!!!
Explanation:
How is the periodic table organized?
Answer:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Explanation:
The periodic table is arranged in order of increasing atomic numbers of elements.
The periodic table is arranged in groups and periods. The elements in the same group have the same number of valence or outermost electrons while the elements in the same period have the same highest energy level.
According to the modern periodic law, the properties of elements are periodic function of their atomic numbers. Hence, the elements are found arranged in order of increasing atomic numbers from left to right in the periodic table.
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Charlotte is driving at 58.6 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 4.36 s. How far has Charlotte traveled in feet during this time?
Answer: 19.71 feet
Explanation:
Given: Speed of Charlotte =58.6 mi/h
Since 1 hour = 3600 seconds
and 1 mile = 5280 feet
So, Speed of Charlotte = [tex]\dfrac{58.6\times5280}{3600}\approx85.95[/tex] mi/ sec
She looks down at her phone and takes her eyes off the road for 4.36 s.
Since , Distance = [tex]\dfrac{speed}{time}[/tex]
So, Distance = [tex]\dfrac{85.95}{4.36}=19.71\ feet[/tex]
Hence, Charlotte traveled 19.71 feet during this time.
"What quantitative measurement and qualitative observations can be made about the interactions of matter and energy?" can someone break this down for me?
Quantitative measurements are numerical values, they involve amounts and units like measuring things. Qualitative observations appeal to the five senses, like what does the interaction look and sound like
Quantitative measurement about the interactions of matter and energy significantly deals with the representation of numerical values and data.
What is Matter?Matter may be defined as any sort of substance that is constructed of numerous types of particles that occupy physical space and possess inertia. In simple words, matter may be characterized as anything which occupies space and has mass.
The Qualitative observation of the interactions of matter and energy prominently deals with the concept based on perception. It basically involves all sorts of senses that one should occupy.
For example, how does the interaction between matter and energy looks like in appearances, heared through sounds, and feels through external factors.
Therefore, quantitative measurement and qualitative observations can significantly be made about the interactions of matter and energy.
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What is the relationship (direct or indirect) between wavelength of light and the energy of its photons?
Answer:
The energy of a wave is directly proportional to its frequency, but inversely proportional to its wavelength. In other words, the greater the energy, the larger the frequency and the shorter (smaller) the wavelength.
Calculate the average acceleration of a car with a starting velocity of 0 m/s2 that accelerates to 9 m/s2 in 3 seconds.
Answer:
Explanation:
If the particle has a velocity of 4 m/s initially (at t=0) and has a constant acceleration of 2 m/s2, find the velocity of the particle: when t=1; when t=2; after t seconds.
The average acceleration of the car starting with a starting velocity of 0 meters/second and accelerating up to 9 meters/second in 3 seconds would be 3 meters/second².
What are the three equations of motion?There are three equations of motion given by Newton
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem we have to find the average acceleration of the car starting with a starting velocity of 0 meters/second and accelerating up to 9 meters/second in 3 seconds,
By using the first equation of motion
v = u + at
By substituting the value of velocities and time period in the first equation of motion,
9 = 0 + 3a
3a = 9
a = 9/3
a = 3 meters/second²
Thus, the acceleration of the car would be 3 meters/second².
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Choose ALL of the statements below that are stated as a hypothesis.
The brighter the color of an orange, the juicler the fruit
The faster a river flows, the greater the erosion.
Most apples are red, but some are yellow.
Baking powder is used in biscuits.
Brass contains copper and zinc.
Answer:
the first 2, the. rest are facts
What is right hand thumb rule ?
Answer:
In mathematics and physics, the right-hand rule is a common mnemonic for understanding orientation of axes in three-dimensional space. Most of the various left- and right-hand rules arise from the fact that the three axes of three-dimensional space have two possible orientations
Explanation:
Answer:
In mathematics and physics, the right-hand rule is a common mnemonic for understanding notation conventions for vectors in 3 dimensions. It was invented for use in electromagnetism by British physicist John Ambrose Fleming in the late 19th century.
When choosing three vectors that must be at right angles to each other, there are two distinct solutions, so when expressing this idea in mathematics, one must remove the ambiguity of which solution is meant.