Answer:
A chemical change occurs when the reactants chemical compositions have changed
Explanation:
a change in colour, change in temperature, change in smell, formation of a precipitate, or the formation of gas bubbles
Hopes this helps
Lily is doing a science experiment with a substance in a sealed jar. At first, the substance’s molecules are moving around each other. What will happen to Lily’s substance if she transfers energy into the substance and causes a phase change?
Explanation:
The molecules will be more separated, and will have least amount of intermolecular force of attraction. the substance's molecules will move faster and the substance will be a gas
Why did Tim conclude that all matter is mostly made of empty space?
Tim conclude that all matter is mostly made of empty space due to presence of all mass in the nucleus.
How atom has mostly empty spaces?An atom is mostly empty space because of its composition. The nucleus, which contains the protons and neutrons indicates the mass of the atom whereas the electrons are revolving around nucleus and there is nothing between orbits.
So we can conclude that all matter is mostly made of empty space due to presence of all mass in the nucleus.
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What is the difference between oxyhaemoglobin and carbaminohaemoglobin?
Answer:
As the name suggests, oxyhaemoglobin is the oxygen bound to haemoglobin and carbamino-haemoglobin is the haemoglobin bound to CO2. Around 20-25% of CO2 is transported as carbamino-haemoglobin back to the lungs, whereas 97% of oxygen is transported as oxyhaemoglobin to the tissues from the lungs.
Explanation:
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What sorts of additional interactions are taken into account when doing solubility calculations with activities, as opposed to those calculated only using molarities?.
Addition of anything which increases the ionic interaction of the solution may change the solubility.
What is Solubility?This is defined as the ability of a substance(solute) to form a solution with a solvent such as water.
In the calculation of a solubility activities it is best to take note of any additional substance as it could increase the ionic interactions thereby leading to a change in solubility.
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The interactions taken into account when doing solubility calculations is that if we add anything which increases the ionic interaction of the solution this may change the solubility of the solute.
What is solubility?Solubility is the degree to which a substance dissolves in a solvent to make a solution.
In this case, the interactions taken into account when doing solubility calculations is that if we add anything which increases the ionic interaction of the solution this may change the solubility of the solute.
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PLs help pls does anyone know this pls
Answer:
A graph, luminosity, temperature, decreases
Explanation:
:)
What is the new volume of 513 mL of gas when the pressure changes from 753 torr to 982 torr? It is not necessary to convert torr to atm and assume a constant temperature.
Answer:
393 mL
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Because only pressure and volume are changing and everything else remains constant, we have that:
[tex]\displaystyle P_1V_1 = k = P_2V_2[/tex]
Where k is some constant.
Hence, substitute and solve:
[tex]\displaystyle \displaystyle \begin{aligned} (753\text{ torr})(513\text{ mL}) & = (982\text{ torr})V_2 \\ \\ V_2 & = 393\text{ mL} \end{aligned}[/tex]
Hence, the new volume is 393 mL.
Check: because volume decreases with an increase in pressure, our answer fits within the context of the problem.
The polarity of a bond between two elements can be best determined by:.
How many milliliters of a 2. 99 M solution of glucose, C6H12O6 , molar mass = 180. 155 g/mol , do you need to obtain 25. 0 g of glucose?
For 25.0 g of glucose, 138.9 ml of the 2.99 M glucose solution are needed.
The most common monosaccharide, or kind of carbohydrate, is often glucose.
Molar mass of glucose = 180.155 g/mol
Molarity of glucose = 2.99 M
Mass of glucose = 25.0 g
The formula for calculating the volume of a solution required to obtain a given mass of the solute is given by,
[tex]Volume of solution (V) =\frac{ Mass of solute (m) }{ Molar mass of solute (M)}* 1000[/tex]
Therefore, the volume of the 2.99 M glucose solution required to obtain 25.0 g of glucose is given by,
[tex]V = (\frac{25.0 }{ 180.155}) * 1000 V = 138.9 ml[/tex]
Hence, 138.9 ml of the 2.99 M glucose solution is required to obtain 25.0 g of glucose.
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The diagram below shows the structures of a plant cell. What is structure 1, and how does it help sustain life? A. Structure 1 is a vacuole, which temporarily stores wastes. B. Structure 1 is the cell wall, which provides structural support for the cell. C. Structure 1 is the nucleus, which is the control center of the cell. D. Structure 1 is a chloroplast, which is the site of photosynthesis.
From the diagram, structure 1 would be the chloroplast and it represents the site of photosynthesis.
Plant cellsThe image (see attached) is that of a plant cell and structure labeled 1 is the chloroplast.
The chloroplast of plant cells acts as the site of photosynthesis where inorganic materials are used to synthesize carbohydrates.
Plants generally serve as producers in food chains and thus, chloroplast helps sustain life.
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Answer:
D Structure 1 is a chloroplast which is the site of photosynthesis.
Explanation:
I got it correct on my test
The body of a 62-year-old is discovered in a dry sauna. In investigating whether he died of natural causes or foul play, Jon needs to ascertain time of death. When he arrived on scene, he finds that the body has not yet undergone rigor mortis. What is MOST important to keep in mind to determine time of death?
1. Heat can accelerate the rate of rigor mortis.
2. Cold can accelerate the rate of rigor mortis.
3. Heat can decrease the rate of rigor mortis.
4. The dryness of the sauna will double the time it takes rigor mortis to set in
Answer:
Heat can accelerate the rate of rigor mortis
Explanation:
Took the test
Heat accelerates the rate of rigor mortis by providing a favorable environment for the bacteria and causing decay. Therefore, option (1) is correct.
What is rigor mortis?Rigor mortis can be described as the third stage of death. Rigor mortis is a recognizable sign of death which is characterized by the stiffening of the limbs caused by chemical changes in the muscles postmortem.
In humans, rigor mortis can take place as soon as 4 hours after death. It typically lasts no longer than 8 hours at room temperature. After death, aerobic respiration ceases, depleting the amount of oxygen used in the making of ATP. ATP is mostly needed to cause the separation of the actin-myosin cross-bridges while the relaxation of the muscle.
When oxygen gas is no longer available, the body can continue to produce ATP through anaerobic glycolysis. When the glycogen is depleted, the ATP diminishes, and the body enters rigor mortis due to unable to break bridges.
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4) The equation of the titration reaction between potassium permanganate
and ferrous sulfate is:
Answer:
the permanganate is the opposite of potassiumation:
Explanation:
The number of atoms in 5 moles of Ag?
Answer:
3x10^24 atoms to 1 sig fig
Explanation:
By definition, there are 6.022x10^23 atoms in a mole.
Multiply this by the 5 moles of silver to find the atoms of silver.
(5 moles)*(6.022x10^23 atoms/mole) = 30.110x10^23 atoms
3x10^24 atoms to 1 sig fig
What is faradays first law
Answer:
“Whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. Likewise, if the conductor circuit is closed, a current is induced, which is called induced current.”
Explanation:
at 25 C, 1.00 mole of O2 gas was found to occcupya volume of 12.5 L at a pressure of 198 kPa. What is the value of gas constant in L•kPa/ mol•K
Answer:
8.3
Explanation:
What information does the third quantum number of an electron give?
The energy sublevel the electron is in.
The specific orbital the electron is in..
The direction the electron is spinning.
The energy level the electron is occupying.
Answer:
The quantum number that specifies the dirction of the orbital angular momentum of an electron in an atom and indicates the orientation of the subshell in which the electron is located.The third quantum number of an electron gives information about the direction the electron is spinning. Option C. This is further explained below.
What is the third quantum number of an electron?Generally, the three quantum numbers are simply defined by characteristic orbital n,l, and m are integers: 0, 1, 2, 3, and so on. The primary quantum number must not be 0.
Hence, the direction an electron spins is given by the third quantum number. This means that for a person to ascertain the direction of an electron the first property of the atom to consider will be the third quantum number.
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If you had 1.00 kg of each kind of hardware, how many boxes of each would you
have?
The number of boxes is calculated by dividing the
total mass of hardware boxes by 1.00 kg
What is a hardware?A hardware is a physical component of a system that can be touched and felt.
Because hardware are physical components, they always have a given mass.
Assuming, several hardware each of mass 1.00 kg is available to be chosen from.
Also, assuming that the sum total of the mass of all the hardware is known.
The number of boxes can be calculated as follows:
total mass of hardware/1.00 kgTherefore, the number of boxes is obtained by dividing the sum of the mass of the boxes by 1.00 kg.
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A force of 20 N is used to move a wagon 10 M. How much work is done.
What happens when cold water is poured in a glass?
Answer:
When the cold water hits the hot glass inner wall of the flask the glass starts cooling and shrinking due to thermal expansion (in reverse). But heat conduction takes time, so for a brief moment the inside of the glass wall is colder than the outside of the glass wall.
Explanation:
what is the molar mass of copper sulfate?
[tex]Copper Sulphate : CuSO \tiny{4}[/tex]
Mass of Copper (Cu) :- 63.5Mass of Sulphur (S) :- 32 Mass of Oxygen (O) :- 16ATQ :- mass of Copper Sulphate :- Cu+S+4(O)
[tex]63.5 + 32 + (4 \times 16) \\ 95.5 + 64 = 159.5grams[/tex]
your answer is :- 159.5 grams or appropriately 160 grams
Answer:
The molar mass of copper sulfate would be 159.5 g.
Explanation:
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help
what mass of magnesium bromide is produced when 35cm3 of 0.18 mol/dm3 of hydrogen bromide is treated with magnesium nitrate?
Answer:
2
Explanation:
2 atoms of hydrogen each of mass 1 = 2 x 1 = 2 g mol–1
1 atom of sulphur of mass 32 = 1 x 32 = 32 g mol–1
4 atoms of oxygen of mass 16 = 4 x 16 = 64 g mol–1
Sammy and Lisa measure the mass of 3 logs. They burn the logs in a campfire, then measure the ashes. They are surprised to find that the mass of the ashes is less than the mass of the logs. How can this be explained?
The mass was compressed into ashes when the fire burned so the mass of the product was less than the mass of the reactants.
The mass was lost because there was a chemical change.
Some of the mass of the logs was turned into smoke and gasses that escaped into the air.
Mass was destroyed in the heat of the campfire.
Explanation: Hope it helps <3
The law of conservation of mass states that, for any closed system, the mass of the system must remain constant.
So, in other words, mass cannot be created nor destroyed.
In a burning log, the initial mass of the wood and the ashes that are left behind after it burns are different, which would seem to violate the law of conservation of mass.
What are tissues made up of?
Answer should be:
Cells
Answer:
similar cells and their intercellular material
Explanation:
cells make tissues which make organs
Britannica
Why did you test the reaction mixture with starch/iodide paper before starting the separatory funnel steps
Answer:
This paper is impregnated with iodide ions and starch and will turn black if treated with an oxidizing agent (e.g. HOCl) which oxidizes the iodide ions
Explanation: hope this helps :)
How many moles of C3H8 will be produced from 75 moles of CO2?C3H8 + 5 O2 → 3 CO2 + 4 H2O
25 moles of C3H8 will be produced from 75 moles of CO2.
Mole calculation
To find the value of moles of a product from the number of moles of a reactant, it is necessary to observe the stoichiometric ratio between them:
[tex]C_3H_8 + 5 O_2 = > 3 CO_2 + 4 H_2O[/tex]
Analyzing the reaction, it is possible to see that the stoichiometric ratio is 1:3, so we can perform the following expression:
C3H8 CO2
[tex]\frac{1mol}{xmol} =\frac{3mol}{75mol}[/tex]
[tex]x = 25mol[/tex]
So, 25 moles of C3H8 will be produced from 75 moles of CO2.
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why does water taste different (bottled)
Answer:
because the water in a bottle has been purified
Explanation:
Answer:
its becausesome water are mineral and some are not
Explanation:
BRAINLESS 55 POINTS!!! HELP ASAP PLS!!!
What is the result of the Moon rotating at the same rate it revolves around Earth?
The same side of the Moon is always seen from Earth.
There are unusually high tides.
The Moon completes two revolutions in one night.
Earth’s magnetic field pulls on only one side of the Moon.
3.
Choose the best answer.
If Martin wanted to measure the distance between the Earth and Jupiter, which unit should he use?
astronomical unit
metric ton
millimeter
light year
How long does it take radiation from the photosphere (what we see as sunlight) to reach Earth?
eight years
eight seconds
eight minutes
eight days
9.
Choose the best answer.
Why is the Southern Hemisphere cooler in the summer?
The Earth is closer to the Sun.
The Earth is farther away from the Sun.
The Southern Hemisphere receives less direct sunlight.
The Southern Hemisphere receives more direct sunlight.
10.
Choose the best answer.
Neptune is the eighth planet from the Sun. It takes about 165 years for it to complete one revolution. What would make Neptune have a shorter revolution?
if Neptune rotated faster
if Neptune were further away from the Sun
if Neptune rotated slower
if Neptune were closer to the Sun
11.
Choose the best answer.
Which lunar phase will occur about four days after a full moon?
waxing crescent
waning crescent
waning gibbous
waxing gibbous
Answer:
waxing crescent is the right answer to this question
an astronaut on the moon throws a ball at a velocity of 4.1 m/s straight up. assuming the gravity on the moon is 1/6 that of earths, how high will the ball reach
Answer:
(1/2)(1.62) t^2 = 1.4
That will give you the time, t
Explanation:
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Food takes longer to cook where?
A. at the top of Mt. Everest
B.In Space
Answer:
B. in space because it is a lot more colder in space then Mt. Everst
Calculate the molarity of 0. 5 moles NaHCO3 in 3,691 mL of solution
Answer: 0.135 M
Explanation:
Some chemical compounds are listed in the first column of the table below. Each compound is soluble in water. Imagine that a few tenths of a mole of each compound is dissolved in a liter of water. The important chemical species that would be present in this solution are written in the second column of the table. Use the checkboxes to classify each compound.
Ionic substances produce ions in solution while molecular substances produce molecules in solution.
What is a solution?A solution is a combination of solute and solvent. The species that occur in solution depends on the type of substance that was dissolved. Since the table is not shown, we do not know exactly what compounds were dissolved in solution.
Generally, if an ionic substance is dissolved in solutions that ions are present in the solution. If a molecular substance is dissolved in solution, molecules are present in solution.
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