write down the important difference between physical change and chemical change
Answer:
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.
Explanation:
if this helped you should mark this the brainliest answer also you should join a meeting if you like it would be fun
Answer:
physical change is reversible but chemical change is irreveesable4
Structures and Forces - What is force and external forces.
Question 1) Jacob and Ravleen are moving furniture. They need to move the filing cabinet over 6 feet and it is very heavy. Jacob wants to apply force and push it by putting his hands on point A because he thinks it would be easier to move it from the top as there is less weight on the top. Ravleen says it's better to push at point B because the center of gravity is lower. Which person is correct and EXPLAIN why and what may happen if it is pushed in the wrong spot.
Answer:
The restoring force that prevents the furniture from tipping over when pushing the furniture towards the right, F= W × D
Where;
W = The weight of the furniture
D = The horizontal distance from the center of gravity of the furniture, CG and the to the lower right corner of the furniture
Given that A > D, for the furniture to tip over when pushing above the CG, we have;
F1 × A ≤ W × D
∴ F1 << W or for a force much smaller than W, the weight of the furniture applied above the center of gravity, the furniture will tip over
However when the force F2 is applied, where C < D, we have for no tipping over;
F2 × C ≤ W × D, therefore, given that C < D, when a force much higher than the weight, W, is applied at F2, the furniture will remain upright
Therefore, it is better push at a point lower than or equal to the center of gravity, whereby the point B is lower than the center of gravity, it is better to push at point B, Ravleen is correct and it is better to push at point B because the center of gravity is lower
If the furniture is pushed at the wrong spot it may tip over
Please see attached drawing
Explanation:
What step in the water treatment process involves the removal of sediment?
A.
aeration
B.
desalination
C.
filtration
2Al (s) + 3Cl2 (g) --> 2AlCl3 (s) (balanced)
When 52 grams of chlorine gas react, the actual yield is 42.5 grams, what is the
percent yield?
Answer:
Percent yield = 65.2 %
Explanation:
The reaction determines this:
2 moles of Al react to 3 moles of chlorine gas in order to produce 2 mol of aluminum chloride.
We determine the moles of chlorine:
52 g . 1mol /70.9g = 0.733 moles of Cl₂
3 moles of gas can produce 2 moles of salt
Then, our 0.733 moles may produce (0.733 . 2) / 3 = 0.489 moles of AlCl₃
We convert moles to mass to predict the 100 % yield
0.489 mol . 133.3 g /mol = 65.19 g
Percent yield = (Yield produced / 100 % yield) . 100
Percent yield = (42.5 g / 65.19g) . 100 = 65.2 %
You come across two unknown plants and compare their leaves. Plant A has feather like leaves, while Plant B has needles. What type of plant is Plant B? Fern Flowering plant Pine tree Spores
Answer:
The correct answer is - Pine tree.
Explanation:
Coniferous trees or cone-bearing trees normally called conifers adapted their leaves and have needles like leaves that retain more water. Needles do not appear to be leaves but are modified leaves.
Conifer trees adapt this leaf modification to prevent water loss due to transpiration in the case of dry air or atmosphere. Important members of the conifer trees are pine trees, cedars, spruces, and Pines.
Calculate the number of grams in 260 mL ( 1000mL = 1 L) of a 0.55 M solution of NaCl. (1
mol = 58 g)
Answer:
8.29g NaCl are present
Explanation:
To solve this question we must, as first, find the moles of NaCl in 260mL of the solution. These moles can be converted to grams using its molar mass (NaCl = 58g/mol)
Moles NaCl:
260mL * (1L / 1000mL) = 0.260L * (0.55mol / L) = 0.143 moles NaCl
Mass NaCl:
0.143 moles NaCl * (58g / mol) = 8.29g NaCl are present
g EXPERIMENT 1: Calculate the density, record the melting point and the solubility (soluble, partially soluble, and not soluble) in water of the solid substance that you determined in this experiment. Density, melting point and solubility of the solid are intensive properties.
Answer:
If the data is given we can find out the density, melting point and solubility by using the formula given below.
Explanation:
Density is defined as mass of the substance per unit volume of the solution and its formula is p = mass / volume. We can calculate melting point by noting the temperature at which the particular substance starts melting. Solubility refers to the maximum amount of a substance or solute that can be dissolved in a solvent at a given temperature. Divide the mass of the compound by the mass of the solvent and then multiply by 100 g we get solubility in g or in 100g.
How many molecules are in 450.0 grams of aluminum fluoride (AIF3)?
Answer:
5.3586262014272155
Explanation:
You have to go from grams --> moles --> molecules. You can find the equation online.
First you have to find the molar mass of AlF3 which is 83.98 g/mol.
To convert it to moles you simply
450.0 grams × [tex]\frac{1 mol}{83.98 grams}[/tex] = 5.358 mol
To convert mol to molecules: (multiply by Avogadros # = 6.022*10^23)
5.358 mol × [tex]\frac{6.022*10^2^3}{1mol}[/tex] = [tex]3.23 *10^{24}[/tex]
how refrigerator magnets work
Answer:
Explanation:
Fridge magnets are made of weakly ferromagnetic ceramics like barium ferrite or strontium ferrite. The magnetic field created by the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeps the magnet stuck to the fridge.
Answer:
the fridge is a magnet
Explanation:
magnets connect to fridge
If 10ml of 1.00M HCI(aq) neutralized 30 ml of an NaOH solution. What was the molarity of the Na OH solution?
Explanation:
plz mark as brainlist///////
What is the minimum amount of material that must be present in a living organism?
Answer:
Living things can have a minimum of one cell
Explanation:
Living things can have a minimum of one cell; these are called unicellular organisms. Some examples of unicellular organisms: bacteria, algae (plants), some fungi, and protozoa
hope this helps!
In an ecosystem ,cell is the minimum amount of material that must be present in a living organism.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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The concentration of a potassium manganate(VII) solution (KMnO4) is 10 g /l . What is the concentration of this solution in molarity?
Answer:
Have anyone found the answer to this? I’m on this grade result course right now
Explanation:
The concentration of a potassium manganate(VII) solution (KMnO4) is 10 g /L. What is the concentration of this solution in molarity is 0.06 M.
What is the molarity?The ratio of number of moles of solute to the volume of the solution in litre is called molarity. it is denoted by symbol M.
Given concentration (C) of potassium manganate(VII) solution in g/L is 10 g /L
Molarity = C/molar mass of KMnO4 = 10g/L ÷ 158.02g/mol = 0.06 mol/L
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Cuál es la Masa en Gramos de 3,5 moles de H2O?
What is the difference in a transverse and a longitudinal wave?
Group of answer choices
Transverse waves are bigger than longitudinal waves
A transverse wave has crests and troughs and a longitudinal has compressions and rarefactions.
Transverse waves are sound waves and longitudinal waves are light waves.
Answer:
A transverse wave has crests and troughs and a longitudinal has compressions and rarefactions.
What does a strong nuclear force do in an atom?
It repels electrons from other electrons.
It repels protons from other protons.
It attracts protons and neutrons.
It attracts protons and electrons.
Answer:
It Attracts Protons And Neutrons
Explanation:
The strong nuclear force can be regarded as strong interaction. It is force which is strong enough to overcomes repulsive force that exist between two positively charged protons, and this give room for protons and neutrons to stick together in small space.This strong interaction can as well be regarded as attractive force and it binds elementary particles known as quarks together and it forms the "nucleons " which is (protons and neutrons) . It should be noted that strong nuclear force Attracts Protons And Neutrons in an atom
Answer:
c
Explanation:
edge
Which of the following is a property of water? (5 points)
Question 13 options:
1)
It can freeze very fast.
2)
It has low heat capacity.
3)
It exists in all three states on Earth.
4)
It repels other water molecules.
I believe the answer is number 1 but I could be wrong ><
Water is a substance composed of hydrogen and oxygen and exists in solid, liquid and gaseous state in nature.
What is hydrogen?Hydrogen is "a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements".
What is oxygen?Oxygen is "a non-metallic chemical element of Group 16 (VIa) of the periodic table".
What is solid?Solid is a state of matter in which atoms or molecules are tightly packed.
What is liquid?Liquid is a state of matter in which atoms are held loosely and are free to flow.
What is gas?Gas is a state of matter which has no fixed shape and volume.
Hence, water exists in three states of matter.
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How many degrees would the temperature of a 45.0 g piece of iron increase if 7,680 J of energy are applied to it? (The specific heat of iron is 0.449 J/g°C)
Question 10 options:
76.6°C
155,000°C
380°C
0.0130°C
Answer:
380
Explanation:
Q=mco
Q is the energy
M is mass
C is specific heat
O is increased in temperature
In which of the following situations would the energy of a system have to decrease?
Answer:
If an object falls from one point to another point inside a gravitational field, the force of gravity will do positive work on the object, and the gravitational potential energy will decrease by the same amount
URGENT!!!
Which statement explains why an increase in molality increases the boiling point of a solution? The addition of solute decreases the solvent’s vapor pressure. A higher temperature must then be applied to overcome the change. The addition of solute increases the solvent’s vapor pressure. A higher temperature must then be applied to overcome the change. The addition of solute increases the solvent’s ability to boil. The solute’s molecules repel the solvent’s molecules, giving them higher binding energy and hence the need for higher temperature.
Answer:
the addition to solute decreases the solvent's vapor pressure. a temperature must then be applied to overcome the change
Explanation:
Answer:
long story short: A
Explanation:
Why do you think the Sun is not at the center of Mercury’s orbit?
Answer:
Like Venus, Mercury orbits the Sun within Earth's orbit as an inferior planet, and its apparent distance from the Sun as viewed from Earth never exceeds 28°. This proximity to the Sun means the planet can only be seen near the western horizon after sunset or the eastern horizon before sunrise, usually in twilight.
Explanation:
1. You have 19.7 grams of a material and wonder how many moles were formed. Your
friend tells you to multiply the mass by grams/mole. Is your friend correct?
Hint Set in the solution an
Answer:
No. If you were to set up what the friend said it would look like this:
19.7g × [tex]\frac{grams}{moles}[/tex] ==> [tex]\frac{19.7 grams}{1}[/tex] ×
The above does not look right because the grams do not cancel out. If it's not cancelled, it would be included in your final answer, but you're looking for moles not grams.
When setting up a stoichiometry equation, you have to put the same unit of measurement (ex- grams, cm, mm, etc.) on the numerator of one side and the denominator of the other side.
This would cancel out the unit.
For example: If you wanted to find out how much of 320 cm are in a meter.
*there are 100 cm in 1 meter*
(1. always start with the given number!)
(2. set up the next fraction where you can cancel out cm)
[tex]\frac{320cm}{1}[/tex] × [tex]\frac{1 meter}{100 cm}[/tex] = 3.2 m
Going back, your friend would have to switch the units from grams/moles to moles/grams. It would cancel out grams, which would leave moles. Therefore, moles will be included in your final answer.
[tex]\frac{19.7 grams}{1}[/tex] × [tex]\frac{moles}{grams}[/tex] = _?_ moles
You will take the ratio of mass and molar mass. Hence my friend is wrong.
Number of moles and molar massThe formula for calculating the number of moles is expressed as:
[tex]Moles=\frac{mass}{molar mass}[/tex]
Given the following
Mass = 19.7 grams
Since the molar mass is measured in gram per mole, hence to get the number of moles, you will take the ratio of mass and molar mass. Hence my friend is wrong.
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What are the environment impacts of Coal?
Explanation:
The major disadvantage of coal is its negative impact on the environment. Coal-burning energy plants are a major source of air pollution and greenhouse gas emissions. In addition to carbon monoxide and heavy metals like mercury, the use of coal releases sulfur dioxide, a harmful substance linked to acid rain.
Several principal emissions result from coal combustion: sulfur dioxide, which contributes to acid rain and respiratory illness.
Which is the correct chemical formula for Pentacarbon Tetraphosphide
Answer:
C5P4
Explanation:
the answer is C5P4 because penta is 5 and tetra is 4
Agustina was standing on the edge of a cliff of unknown height holding a bowling ball. She wanted to find the height of the cliff. She worked with Maite to time the how long the bowling took to fall to the bottom of the cliff. Maite timed the drop at 9.4 seconds on each of their 10 trials. The bowling ball started at rest on each of the trials. What distance did the bowling ball fall in each trial?
Answer:
433 m
Explanation:
Since the fall represents motion under gravity, we use the equation
s = ut - 1/2gt² where s = height of cliff or distance bowling ball falls through, u = initial velocity of bowling ball = 0 m/s(since it starts from rest), t = time = 9.4 s and g = acceleration due to gravity = -9.8 m/s².
So, substituting the values of the variables into the equation, we have
s = 0 m/s × 9.4 s - 1/2 × 9.8 m/s² × (9.4 s)²
s = 0 m - 1/2 × -9.8 m/s² × 88.36 s²
s = 1/2(865.928 m)
s = 432.964
s ≅ 433 m
Somebody please help this is due in 30 minutes! (picture is attached)
44.5 g Al2(SO4)3
Explanation:
# moles Ba(NO3)2 = (0.543M)(0.717 L)
= 0.389 mol Ba(NO3)2
Now we use the molar ratios,
0.389 mol Ba(NO3)2 ×(1 mol Al2(SO4)3/3 mol Ba(NO3)2)
= 0.130 mol Al2(SO4)3
0.130 mol Al2(SO4)3 × (342.15 g Al2(SO4)3/(1 mol Al2(SO4)3)
= 44.5 g Al2(SO4)3
What is the radius of this circle if the circumference is 18 pi cm?
Answer: 2.86 inches
Explanation: To find the radius, then, we insert 18 in for the circumference. So 18=2∏r. Solving for r gives 9/∏, or approximately 2.86 inches.
Answer:
2.86 inches
Explanation:
Anyone know this question
Answer:
12
my advice is split the equation into 2 and write on each side how many atoms of each element are there and it will be easier to balance.
Need help on this question asap pleasee
Answer:
9.0 moles of CaO
Explanation:
We have the reaction equation as follows;
Fe2O3 + Ca3(PO4)2 -------> 2FePO4 + 3CaO
Now we know from the equation that;
1 mole of iron III oxide yields 3 moles of CaO
Therefore;
3 moles of iron III oxide yields 3 * 3/1
= 9.0 moles of CaO
Calculate the molarity of a solution that contains 0.75 moles of lithium fluoride, LiF, in a 65 mL solution.
The molarity (M) of a solution is 11.5 M that contains 0.75 moles of lithium fluoride, LiF in a 65 ml of solution.
What is Molarity ?Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar concentration. The S.I Unit of Molarity is molar (M) or mol/L.
How to find molarity of a solution ?Molarity (M) = [tex]\frac{\text{Number of moles of solute}}{\text{Volume of solution (in liters)}}[/tex]
From the above definition it is clear that the volume of solution is in liter. In question the volume of solution is given in ml.
So, convert 65 ml into l.
65 ml = [tex]\frac{65}{1000}[/tex] = 0.065 l
Now, put the values in above formula, we get that
(M) = [tex]\frac{0.75}{0.065}[/tex] = 11.5 M
Thus, the molarity of a solution is 11.5 M that contains 0.75 moles of lithium fluoride, LiF in a 65 ml of solution.
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Convert 22 grams of copper Il chloride (Cucl2) to moles.
with work please