Answer:
Explanation:
D. 2 Fe's, 3 O's
An atom is the smallest indivisible particle of a substance. Most notations of elements in actual sense depicts the combining atoms.
In Fe₂O₃, the subscript gives the idea of the number of combining atoms and their combining ratios. Here, weh have 2 atoms of Fe and 3 atoms of Oxygen.
Activated carbon filters use chemical means to seperate impurities from air:
Chemical reactions occurs when compounds are formed. Activated carbon filters are made up of activated carbons in which impurities have been removed and the pores of the carbon structure have become widened. This leaves the carbon with much surface area for chemical reaction to occur between impurities and the carbon in form of chemical adsorption. One important thing to note is that, in chemical change, it is difficult to resolve the reactants after the product is formed. In physical change, simple seperation techniques are used to seperate the reactants out.
Janelle is observing a sample of matter. She notes that it is a shiny silver-colored solid, has a
mass of around 20 grams, and conducts heat and electricity well. What type of properties is
Janelle observing?
Chemical properties
Only intensive properties
Physical properties
Only extensive properties
Janelle is observing Physical properties.
Why?
The properties of matter can be classified as follows:
Extensive and Intensive: Extensive properties depend on the amount of matter involved in the measuring (e.g. mass), and intensive properties do not depend on the amount of matter (e.g. density, conductivity).Physical and Chemical: Physical properties do not involve a change in the nature of the substance that is being measured (e.g. color, length), while Chemical properties involve a change in the nature of the substance when they are measured (e.g. reactivity).The properties that Janelle observed are: Color (intensive, physical), mass (extensive, physical), heat conductivity (intensive, physical), and electrical conductivity (intensive, physical). All these properties are Physical properties.
Have a nice day!
How many atoms are in 3.64 mol of pure aluminum?
Total, approximately 2.19 x 10²⁴ atoms in 3.64 mol of pure aluminum.
To determine the number of atoms in a given amount of substance, you can use Avogadro's constant (6.022 x 10²³ atoms/mol). This constant will represents the number of atoms, ions, or the molecules in one mole of the substance.
Given:
Amount of aluminum (Al) = 3.64 mol
Avogadro's constant = 6.022 x 10²³ atoms/mol
Number of atoms = Amount of substance (in mol) × Avogadro's constant
Number of atoms = 3.64 mol × (6.022 x 10²³ atoms/mol)
Number of atoms ≈ 2.19 x 10²⁴ atoms
Therefore, there are approximately 2.19 x 10²⁴ atoms in 3.64 mol of pure aluminum.
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Define Newton's 1st and 2nd laws of motion and give an example of each law.
Please gelpp
First Law: An object in motion will stay in motion unless acted on by an unbalanced force. An object at rest will stay at rest unless acted on by an unbalanced force.
Lets say a cup is sitting on a table, if you fall into that table and knock over the cup you are the unbalanced force acting upon the cup. The cup is at rest until you (the unbalanced force) acted upon it.
Second Law: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Say you are at the Supermarket. Its easier to push the empty shopping cart. Once the cart is filled you must exert more force to push it. This is because the empty cart has less mass than the full one.
In the photosynthesis equation, what does the subscript number mean?
Question 2 options:
Number of molecules
Number of protons
Number of electrons
Number of atoms
The equation for photosynthesis is: 6H2O + 6 CO2 --> C6H12O6 + 6O2 The numerals in each part of the equation (without balancing it) mean: H2 = 2 atoms of Hydrogen O = 1 atom of Oxygen } H2O=water C = 1 atom of Carbon O2 = 2 atoms of Oxygen } CO2= Carbon Dioxide C6 = 6 atoms of Carbon H12 = 12 atoms of Hydrogen O6= 6 atoms of Oxygen } C6H12O6 } Glucose O2 = 2 atoms of Oxygen } O2 = Oxygen When balanced: 6H2O = 6 molecules of water 6CO2 = 6 molecules of Carbon dioxide C6H12O6 = Glucose 6O2 = 6 molecules of Oxygen.
Answer:
The correct answer is "Number of atoms"
Explanation:
Photosynthesis is a unique metabolic process carried out by certain cells of those autotrophic organisms capable of elaborating their own organic matter with inorganic substances by using the energy provided by sunlight. In other words, photosynthesis is the process by which plants make their own food. For that, they need air, sun, light and water and thus, they can live and develop.
The general chemical reaction for photosynthesis is 6 moles of carbon dioxide (CO₂) and 6 moles of water (H₂O), with the addition of solar energy. This produces 1 mole of glucose (C₆H₁₂O₆) and 6 moles of oxygen (O₂). That is, the equation is represented as:
6 H₂O + 6 CO₂ --> C₆H₁₂O₆ + 6 O₂
The letters represent elements present in the species that reacts or is produced. The numbers that appear as subscripts indicate the number of atoms of the element immediately before the subscript that appear in each species and, if no subscript appears, it indicates that an atom is present.
So, the correct answer is "Number of atoms"
Why did other scientists discount Wegener's theory of continental drift? Why did Wegener have a hard time convincing other people that his idea was correct?
A. He couldn't explain how it happened, only that it did happen
B . He had a bad reputation in the scientific community
C. He never published his ideas in a report or book
D. He had no evidence
Answer:
He couldn't explain how it happened, only that it did happen
Explanation: The answer later came from someone else
Answer:
Option (A)
Explanation:
Alfred Wegener was the person who put forwarded the theory of continental drifting. But it was difficult for him to explain this theory. He had evidences regarding the drifting of the continents but he was not able to determine the main mechanism behind this continental motion. This is why he had a hard time convincing other people that his idea was correct.
Later, over a due course of time, the new and widely accepted theory known as the Plate tectonic theory, was able to prove the mechanism behind the drifting of the continents. The main mechanism behind this was the convection current that generates in the mantle, and these currents were formed because of the heat radiated from the interior of the earth.
Hence, the correct answer is option (A).
Stephanie purchased two watermelons. One watermelon weighed 6.95 kilograms. The second watermelon
weighed 952 grams more than the first.
How much did the second watermelon weigh in grams?
1 kilogram= 1000 grams
grams
Answer:
7.47 kilograms
Explanation:
Answer:if 1 kg is equal to 1000 g so 1000/952 is equal to 1.05 kg
Explanation:the second watermelon weigh 1.05 k than the first watermelon ,so 6.95 + 1.05= 8 k
Any two objects that have mass will also have which type of force between them? A- Magnetic
B- Gravitational
C-Nuclear
D- Chemical
Remember for science class!!!!!!!!!!!!!!!
Answer:
Gravitational
Explanation: Hope This Helps And Have A Great Rest Of Your Day.
During which change is heat energy released?
A. Melting
B. Boiling
C. Sublimation
D. Condensation
Answer:
Condensation
Explanation:
In consideration the temperature does not change so the heat change the state of the substances
Answer:
A
Explanation:
because the substance is using the pressure of heat to melt the substance
highlighted answer is wrong just need someone to explain it if you can!❤️
Answer:
2.7 x 10^-1
Explanation:
The places you move to the left are added to the 10 in negative exponential
Most carbon compounds are formed by exchanging electrons with carbon.
True
False
Answer:
Most carbon compounds are formed by exchanging electrons with carbon. True
Suppose your bedroom is 21 ft long, 17 ft wide, and the distance from floor to ceiling is 7 ft, 6 in. You need to know the volume of the room in metric units for some scientific calculations. What is the room’s volume in cubic meters.
1. ______ m^3 (cubic meters)
2.______ L (Liters)
Answer:
1. 75.82 m^3 (cubic meters)
2. 75820 L (Liters)
Explanation:
Given data
L = 21 FT
W = 17 ft
h = 7 ft 6 in
Calculation
Formula to calculate volume is:
V= L×W×h
put the values in formula
V = 21 ft × 17 ft × 7 ft 6 in
V = 2677.5 ft
Now we will convert Cubic ft to cubic meters, as we know that 1 cubic meter is equal to 35.3147 cubic feet
V (m^3) = 2677.5 ÷ 35.3147
V (m^3) = 75.82 m^3
Now we will calculate liters
as we know that 1 cubic meter is equal to 1000 liters
so multiply the ans. with 1000
L = 75.82 × 1000
L = 75820 l
In which of the following situations is heat transferred from the source to popcorn kernels by the method of conduction?
An air popper is used
Popcorn bag is exposed to the sun
Bag of corn is placed in a microwave
Kernels are placed in a pan on a stove
Answer:
Kernels are placed in a pan on a stove
Explanation:
Heat transfer by conduction involves the actual movement between particles of the medium. For conduction to occur, the particles must be in contact with the heating medium or the body at a higher temperatures.
For the popcorn kernels to conduct heat using the conduction heat transfer process, the kernels are placed in contact with the heat source using the frying pan. The stove is the heat source.
When put a knife in contact with fire, it is heat transfer by conduction.
Answer:kernels are placed in a pan on a stove
Explanation:
Identifying Isotopes
Identify the parent isotope and daughter isotope in this nuclear reaction:
Ram Rn+ He
Which is the parent isotope?
Answer:
The parent isotope in the given elements is Radium 226.
Explanation:
The two elements given in the question are radioactive elements radon and Helium which are formed after an Alpha decay happens in the radium 226 to form Radon 222.
Radon has many isotopes out of which here radon 222 is formed which is a noble gas that is odourless colourless but Radioactive. Again in this reaction helium is formed which is again a noble gas and very light in weight.
Answer:
the 3rd option on edge
Explanation:
If gas in a sealed container has a pressure of 50 kPa at 300 K, what will the pressure be if the temperature rises to 360 K?
60 kPa
161 kPa
41 kPa
16 kPa
Answer:
[tex]\boxed{\text{60 kPa}}[/tex]
Explanation:
The volume and number of moles are constant, so we can use Gay-Lussac’s Law:
At constant volume, the pressure exerted by a gas is directly proportional to its temperature.
[tex]\dfrac{p_{1}}{T_{1}} = \dfrac{p_{2}}{T_{2}}[/tex]
Data:
p₁ = 50 kPa; T₁ = 300 K
p₂ = ?; T₂ = 360 K
Calculation:
[tex]\begin{array}{rcl}\dfrac{50}{300} & = & \dfrac{p_{2}}{360}\\\\\dfrac{1}{6} & = & \dfrac{p_{2}}{360}\\\\\dfrac{360}{6} & = & p_{2}\\\\p_{2} & = & \mathbf{60}\\\end{array}[/tex]
[tex]\text{The new pressure will be $\boxed{\textbf{60 kPa}}$}[/tex]
PLEASE HURRY
In order to calculate how many neutrons are in an atom, you must subtract the mass number from the number of protons?
Neutrons = Mass # - Protons Question
True or False
Answer:
true
Explanation:
what are the advantages of adulteration
The advantages of food adulteration includes a better appearance in the food and may increase the selling price, but these advantages only affect the producer of the product. Disadvantages include the increased risk of illness and allergic reactions due to the inedible products that are addedExplanation:
A group of engineers has just conducted an experimental trial on a shoe
designed to help people suffering from a painful foot disorder. During the trial,
the shoe proved effective for only 5% of the test subjects. What should the
engineers do next?
Answer:
its c on mine but,
find out if the sole of the shoe can be redesigned.
Explanation:
When a beaker of water is heated over a Bunsen burner, the volume increases slightly. What is the most likely reason for the small increase in volume?
A
The water molecules are getting smaller.
B
The water molecules are getting bigger.
C
The water molecules are moving faster.
D
The water molecules are moving slower.
Answer:
most likely c
Explanation:
the volume is increased by the quickly moving water particles
Answer: Option C
Explanation:
The molecules has kinetic energy and potential energy both. When the water molecules were heated on a Bunsen Burner then there can be a slight increase in the volume of the water.
This is because upon heating the kinetic energy of the molecules increases and it starts moving fastly.
Due to the movement of the particles, they become far from each other and there is a slight increase in the volume of the water.
hurry plz
\
Victor made the graph shown to record the observations of an experiment to study the effect of soil additives on the growth of plants. Three identical plants having a height of 25 cm were used for the experiment. The first plant had no soil additives, the second plant had wheat straw in the soil, and the third plant had polymer in the soil. All other growing conditions of the plants were kept constant.
Which correct step in the scientific method did Victor most likely do before the step described here?
Analyze the data
Publish the results
Construct a hypothesis
Make conclusions based on the graph
How is volume calculated given mass and density?
Sum of mass and density
Mass divided by density
Mass multiplied by density
Difference of mass and density
The correct steps in the scientific method did vector most likely do before the step described is make conclusion based on the graph. Thus option c is correct.
How is volume calculated given mass and density?Victor made the graph shown to record the observations of an experiment to study the effect of soil additives on the growth of plants.
Three identical plants having a height of 25 cm were used for the experiment. The first plant had no soil additives, the second plant had wheat straw in the soil, and the third plant had polymer in the soil. All other growing conditions of the plants were kept constant.
Volume is calculated if the mass and density are given as below:
As we know that density is mass per unit volume it means 1 kg of mass in 1 cubic meter is called volume.
So, mathematically
Density = mass/ volume
Then
Volume = mass/density
S.I unit of volume is cubic meter.
Therefore, The correct steps in the scientific method did vector most likely do before the step described is make conclusion based on the graph. Thus option c is correct.
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The correct step in the scientific method did Victor most likely do before the step described here is option C: Construct a hypothesis
Volume is calculated by dividing the mass of an object by its density. So, the correct option is option b: Mass divided by density
Which correct step in the scientific method did Victor most likely doScientists usually begin by creating a hypothesis before doing an experiment and gathering information.
A hypothesis is an idea or guess that can be tested to explain something we are studying.
In this situation, Victor would have guessed how adding things to the soil (like wheat straw and polymer) would change how plants grow, compared to plants without any added things.
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Which unit would be most appropriate for measuring the volume of water in a swimming pool?
the volume ( in gallons)
What is the formula for C2H6?
The formula for C2H6 is CH3-CH3.
Explanation:
The given formula C2H6 is the molecular formula depicting the integral number of atoms of combining elements. From this formula, it can confirmed that 2 atoms of carbon has combined with 6 atoms of hydrogen, but the arrangement of these atoms and the bonding between them is unclear from the given formula.
In order to determine the bonding occurring between elements and how the atoms are arranged or bonded with each other, we use structural formula representation. It is known that a single carbon atom that should have four bonds to attain the stable state and each hydrogen atom can share only one electron.
So the structural formula of C2H6 can be written as CH3-CH3. This indicates that three hydrogen atoms will be bonded with a single carbon atom leading to formation of single bond between two carbon atoms surrounded by three hydrogen atoms on either sides of carbon atoms. This material is termed as ethane and it falls in alkalies group of organic compounds.
Answer:
The general Formula given for alkanes is [tex]CnH2n+2[/tex] and hence it shows [tex]C_2 H_6[/tex] is the second alkane and is named ethane.
Explanation:
Formula here shows two molecules of [tex]CH_3[/tex] are joined that is the formula for Ethane becomes [tex]CH_3-CH_3[/tex].
If we break the name ethane it gives two divisions eth and ane the former means to while the latter represents the alkane family. Hence the formula represents two carbons in alkane family which makes it [tex]C_2H_6[/tex].
One of the following properties was originally used to arrange elements in the periodic table but is no longer used to organize the modern version which property fits the description
Answer:
atomic mass
Explanation:
Answer:
atomic weight or atomic mass.
Explanation:
The development of periodic table starts from the Dobereiner's law of triad where he arranged the elements based on the average of atomic weight of two elements. the middle element was supposed to one with the atomic weight average of the two other elements.
Then the Newland law of octave was proposed where he observed the changes in the periodic trend based on atomic weight after seven elements.
Later Mendleev arranged the elements based on atomic weight only.
Thus the answer is atomic weight or atomic mass.
In modern version we use atomic number to arrange elements.
HELP ASAP WILL GIVE BRAINLY
Which of the following describes a compound? (Hint: Carbon and oxygen both appear in the periodic table)
A. A piece of pure carbon, containing only carbon atoms
B. Oxygen gas surrounding a solid piece of carbon
C. A substance made of two Oxygen atoms for each carbon atom
D. Carbon and oxygen atoms mixed without being bonded together
Answer:
C is the correct answer
Explanation:
A compound is a substance that contains two or more atoms chemically combined together in a fixed ratio by mass.
Match the formula for the following compound: acetic acid HC 2H 3O 2 C 2H 3O 2 H 2C 2H 3O 2 HA
Final answer:
The formula for acetic acid is C2H4O2, also written as CH3COOH. Its empirical formula, derived by simplifying the molecular formula to the lowest whole number ratio, is CH2O.
Explanation:
The formula for acetic acid is C2H4O2, which can also be written as CH3COOH. In calculating its empirical formula, you would note the number of Carbon (C), Oxygen (O), and Hydrogen (H) atoms. You mentioned a given molecular formula of acetic acid as C2H4O2. This indicates a ratio of 2 Carbon atoms to 4 Hydrogen atoms to 2 Oxygen atoms. Dividing by the lowest common denominator, which is 2, yields a simplest whole-number ratio of atoms of 1:2:1, thus the empirical formula for acetic acid is CH2O.
Which sequence has the states of matter listed from least to greatest kinetic energy!
A solid gas liquid
B. gas liquid → solid
C. liquid → solid gas
D. solid → liquid → gas
Answer: B. gas, liquid, Solid
Hope I Helped
:)
Answer:
C
Explanation:
Solid, liquid, gas
which statement about schrodingers theory of the atomic model is true?
I found the complete question:
Which statement about schrodingers theory of the atomic model is true?
A. it proved that the nucleus of an atom is positively charged.
B. it was the first theory to discuss the existence of electrons.
C. it explained the odds of finding the position of an electron.
D. it assumed the electron cloud to be heavier than the nucleus.
Answer:
C. it explained the odds of finding the position of an electron.
Explanation:
Erwin Schrodinger formulated the wave equation of electrons. His wave equation highlighted the probability of where an electron can be found or located in an energy level.
The region of maximum probability of where an electron is located is referred to as an electron cloud or an orbital.
Answer:
c
Explanation:
If you added 45,000 calories to water that was at 25 degrees C, and the ending temperature was 35 degrees C, how much water did you have (in L)?
Answer:
4.5 L water we have in litres (L).
Explanation:
[tex]Q=m\times c \times \Delta T[/tex]
where
[tex]\Delta T[/tex] = Final T - Initial T
Q is the heat energy in calories
c is the specific heat capacity (for water 1.0 cal/(g℃))
m is the mass of water
Plugging in the values
[tex]\\$45000 \mathrm{cal}=m \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times\left(35^{\circ} \mathrm{C}-25^{\circ} \mathrm{C}\right)$\\\\$45000 \mathrm{cal}=m \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times 10^{\circ} \mathrm{C}$\\\\$m=\frac{45000 \mathrm{cal}}{1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times 10^{\circ} \mathrm{C}}$\\\\$m=4500 \mathrm{g}$\\\\Density of water $=\frac{\text { mass }}{\text { volume }}$[/tex]
So,
Volume of water = mass/density
[tex]\\\\=\frac{4500 \mathrm{g}}{\frac{1.09}{\mathrm{mL}}}=4500 \mathrm{mL}$$[/tex]
=4.5 L (Answer)
What is the mass of one mole of titanium atoms
Answer:
47.88 g
Explanation:
The atomic mass of titanium is 47.88 amu or 47.88 g/mol
it means,
one mole of titanium = 47.88 g
Which two atoms are isotopes of each other?
Answer:
C
Explanation:
Consulting the definition of an isotop we find that it requires the same element to obtain a different valence (?!) by accepting or donating electrons(?!)
The atoms that are isotopes to each other are ²⁴₁₂Mg and ²⁵₁₂Mg. Option C is correct.
Isotopes are the atoms of the same element. They have same number of electrons and protons. They have different number of neutrons. They have same atomic number but have different mass number. They are either stable or reactive.
For Example: Hydrogen has three isotopes, protium, deuterium and tritium. And, Chlorine has two isotopes, they are Chlorine-35 and chlorine-37.
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Which has a great influence on one’s sense of self, in addition to self-confidence, self-respect, and values?
attitude
actions
perceptions
beliefs
Answer:
attitude
Explanation:
if your in k12 health attitude is the answer. perceptions was wrong
An attitude has a great influence on one’s sense of self, in addition to self-confidence, self-respect, and values.
So, first option is correct one.
What contributes to our self of sense?The self of sense also refer as ego , individuality and personality.
The things which contributes identity as a person are,
Your belief systemPersonality triedAbilitieslike and dislikelearn about self-confidence.
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