Answer:
Imagine you have 5 marbles in your hand and 5 marbles spread in front of you on the floor. Each group has the same mass, but one is contained in a smaller space. The marbles in your hand would be denser because there is more "stuff" in a smaller space.
Explanation:
Which is the best description of a molecule?
Answer:
a molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms
Answer:
: A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
Explanation:
i hope its right
Which of the following is a correct representation of the isotope of Sulfur that has 18 neutrons?
a. Sulfur-18
b. Sulfur-16
c. Sulfur-36
d. Sulfur-33
Answer: sulfur-36
Explanation:
i will give brainliest pls help
what chemical property is used when cooking
Answer:
Chemical properties of food are those properties that cannot be measured without altering the chemical composition of the food material.
Explanation:
Answer:
The property of chemical reactive foods is used.Let's take an example of cooking an egg.Cooking an egg is a chemical reaction because you can't change cooked egg into raw or its previous state.There are two types of reactions
Physical reactionChemical reactionWhen cleaning a buret
Answer:
1. Rinse with distilled water.
2. Avoid dropping it
3. Use a stopper and fill with water and shake
4. Dry
Gravity creates stars, planets, or black holes through a process called __________?
Question 2 options:
spiral matter
accretion
intertwining
fusion
Answer:
Accretion
the process of growth or increase, typically by the gradual accumulation of additional layers or matter.
What are the energy transformations in a fossil fuels power plant?
chemical energy, electricity, mechanical electricity, light energy, thermal energy, kinetic energy
please put them in order.
Answer:
In a fossil fuel power plant the chemical energy stored in fossil fuels such as coal, fuel oil, natural gas or oil shale and oxygen of the air is converted successively into thermal energy, mechanical energy and, finally, electrical energy.
100 POINTS!!!!!!! FAST PLEASE
A
Find a room that can be made completely dark. In the room, tape a piece of white paper on the wall at eye level. Turn on the flashlight, and turn off the lights in the room. Observe what the light looks like as it hits the white paper. Next, place the clear plastic in front of the flashlight. Does the plastic affect how the light hits the paper on the wall? If so, how?
B
Now place the waxed paper in front of the flashlight instead of the plastic. Does the waxed paper affect how the light hits the paper on the wall? Explain your response.
Answer:Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
Explanation:
What is Reflection ?
Reflection of light occurs when light hits a smooth surface that does not absorb any of the light but instead bounces it back off the surface.
A mirror is flat, smooth, and polished. When light hits a mirror it is not absorbed but is reflected off at a very predictable angle.
The angle that the light hits the mirror is called the angle of incidence.
The angle of light that bounces off the mirror is called the angle of reflection.
The Law of Reflection states that the angle of incidence is equal to the angle of reflection.
Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
a solid is 5 cm tall 3 cm wide and 2 cm stick it has a mass of 129 g what is its density
Problem:
a solid is 5 cm tall 3 cm wide and 2 cm stick it has a mass of 129 g what is its density
Answer:
[tex]\sf{4.3g/cm³}[/tex]
Solution:
To achieve a volume of 30, multiply 5,3, and 2 together. Density is defined as the ratio of mass to volume, thus divide 129 by 30. You'd obtain a mass of 4.3.
Therefore 4.3 g/cm³ would be the answer.The word "atom" means:
the smallest imaginable thing
that which cannot be cut
everything that is not vacuum
that which cannot be seen
Answer:
the smallest particle of a chemical element that can exist.
Answer:
the smallest imaginable thing
Explanation:
Which hydroxide is a weak base?
RbOH
CsOH
Sr(OH)2
NaOH
None of these choices are weak bases.
Answer:
NH4OH
Explanation:
NH4OH is a weak base because it partially dissociates into NH + and OH− ions in aqueous solutions and the amount of OH− ions produced is low.
How much heat, in kilocalories, is produced when 4.20 g of ethanol reacts with O2 gas?
The reaction as shown is a combustion reaction. 29.8 kCal of heat is produced when 4.20 g of ethanol reacts with O2 gas.
The equation of this reaction is shown below;
C2H5OH + 3O2 →2CO2(g)+3H2O(l)+327 kcal
From the reaction equation, we can see that 1 mole of ethanol produces 327 kcal of heat.
Now, we have to find the number of moles in 4.20 g of ethanol as follows;
Number of moles = mass/molar mass = 4.20 g/46 g/mol = 0.091 moles
If 1 mole of ethanol yields 327 kcal of heat
0.091 moles of ethanol yields 0.091 moles × 327 kcal / 1 mole
= 29.8 kCal
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Why does one electron in a potassium atom go into the fourth energy level instead of squeezing into the third energy level along with the eight already there?
Answer:
Explanation:
Because the third shell is full, the rule of quantum mechanics prevent the third level from holding more than eight electrons.
The third level cannot accommodate more than eight electrons due to the fullness of the third shell and the laws of quantum physics.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.
The laws of quantum physics are every moving particle, whether microscopic or macroscopic, has a wavelength according to De Broglie's equation. According to Heisenberg's Uncertainty Principle, it is impossible to measure a particle's position and momentum with the same level of accuracy.
Thus, the third level cannot accommodate more than eight electrons due to the fullness of the third shell and the laws of quantum physics.
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How many grams of titanium metal can be produced if 12.5 of hydrogen gas reacts with excess titanium(IV) bromide(TiBr4)?
A. 6.25g
B. 148g
C. 47.9
D. 6.20g
The mass of titanium metal formed is 148g.
The equation of the reaction is;
TiBr4(s) + 2H2(g) ------>Ti(s) + 4HBr(g)
The number of moles of hydrogen gas = 12.5 g/2.00 g/mol = 6.25 moles of hydrogen gas
If 2 moles of hydrogen gas yields 1 mole of titanium metal
6.25 moles of hydrogen gas yields 6.25 moles × 1 mole/2 moles = 3.1 moles of titanium metal
Mass of titanium metal = 3.1 moles of titanium metal × 47.8 g/mol = 148g
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How can you tell baking a cake produces a chemical change?
Answer: see below
Explanation:
1. Change in smell
2. Heat given off
3. New substance (cake) cannot be separated into the original ingredients
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How many grams are contained in a 0.183 mol sample of ammonium phosphate?
Molar mass of ( NH₄)₃PO₄ = 14.01×3 + 1.01×12 + 30.97 + 16.00×4 = 149.12 g/mol. Mass of 0.183 mol ...
A 0.183 mol sample of ammonium phosphate contains approximately 27.289 grams.
To calculate the number of grams in a given amount of a substance, we need to use its molar mass.
The chemical formula for ammonium phosphate is (NH₄)₃PO₄. To determine the molar mass, we sum up the atomic masses of all the atoms in the formula.
The atomic masses are as follows:
N = 14.007 g/mol
H = 1.008 g/mol
P = 30.974 g/mol
O = 15.999 g/mol
Now we can calculate the molar mass of ammonium phosphate:
Molar mass = (14.007 g/mol × 3) + (1.008 g/mol × 12) + (30.974 g/mol × 1) + (15.999 g/mol × 4)
Molar mass = 149.082 g/mol
Next, we can use the formula:
Mass = Number of moles × Molar mass
Mass = 0.183 mol × 149.082 g/mol
Mass ≈ 27.289 g
Therefore, a 0.183 mol sample of ammonium phosphate contains approximately 27.289 grams.
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Only 14 one pleaseeee
Answer:
A. displacement) الازاحة
B. المسافة الفعلية للسيارة distance
You will calculate speed from graph (B) because it's the real distance, but (a) is Unreal distance
(II) speed equal distance / time
Speed =(250*1000/5*60*60).
=13.9888888m/s
What state of matter is water in a lake? Gas Liquid Solid Transitive
Answer:
Liquid
Explanation:
Solid would be made out of ice.
Explanation:
soild would be ice gas would be steam or evapiration
A prospector panning for gold (Au) in a river collects 15.00 g of pure gold. How many Au atoms are in this quantity of gold?
Answer:
There are 4.59*10^-24 atoms in 15.00 of pure gold.
Explanation:
Molar mass of gold is 196.996g/mol
[tex]\frac{15}{196.966} =0.076 mol[/tex]
0.076*(6.022*10^-23)=4.59*10^-24
Connect and Apply scientific knowledge to explain the following situations:
a. Link the concepts of mole, molar mass, number of atoms, Avogadro’s
number and mass using a flowchart or mind map.
b. Rearrange the two equations to make each variable the focus (you will end up with three variations for each equation).
c. Record the equations for number of moles and number of particles (and
each equation triangle) - Annotate each symbol with what it means and definition and the units.
d. Explain mole concept using any real life example
Answer:
b.Rearrange the two equations to make each variable the focus (you will end up with three variations for each equation).
Caffeine is used commercially as a
As a projectile falls vertically, it also travels horizontally. Is the distance which it falls
vertically effected by its horizontal velocity?
no
its kinematics
the acceleration due to gravity and the initial vertical velocity are the only thing that affects vertical distance
No, the distance which it falls vertically does not affect by its horizontal velocity.
Downward acceleration of a projectile is same as downward acceleration of a free falling body due to constant gravity. Horizontal velocity ([tex]V_h[/tex]) does not affect vertical velocity ([tex]V_v[/tex]). Gravity affects vertical velocity ([tex]V_v[/tex]).The horizontal velocity of a projectile is constant. There is a vertical acceleration caused by gravity; its value is 9.8 m/s², down, The vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.Learn more:
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Use the equation to answer the question
CH4 + 202 + CO2 + 2H2O
If you change the 2 in front of 20, to a 3, what will be the change in the results on the right side of the equation?
(1 point)
If you change the 2 in front of 2O, to a 3, the result of the right side of the equation is [tex]3CO_2+6H_2O[/tex]
Given the chemical equation expressed as:
[tex]CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O[/tex]
From the equation, we can see that 1 mole of methane reacts with 2 moles of oxygen to form 1 mole of carbon dioxide and 2 moles of water.
If the number of moles of oxygen is replaced with 3 moles, the correct equation will be expressed as:
[tex]3CH_4 + 2(3O_2) \rightarrow3CO2 + 6H2O[/tex]
This shows that if you change the 2 in front of 2O, to a 3, the result of the right side of the equation is [tex]3CO_2+6H_2O[/tex]
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Answer:
Simple Chemical Reactions Unit Test:
1. There is an extra O2 molecule left over.
2. Covalent bonds tend to be less polar than ionic bonds.
3. PH3
4. replacement
5. Potassium is more reactive than hydrogen.
6. Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
7. H2SO4 + 8HI → H2S + 4I2 + 4H2O
8. 2, 1, 2
9. Nitrogen and oxygen have an electronegativity difference of 0.5, so the bond is polar covalent, with oxygen pulling the electrons toward it.
10. Sodium donates an electron to chlorine.
11. selenium (Se)
12. bond type
13. six
14. K
15. indicator
Have a great day! :)
How does matter and energy cycle through an ecosystem?
a.
Cellular respiration alone
b.
The atmosphere
c.
Photosynthesis and cellular respiration
d.
Photosynthesis alone
Please help D;
Answer:
C
Explanation:
- Freon-12 CF-a, is commonly used as the refrigerant in cen-
sal home air conditioners. The system is initially charged to a
pressure of 4.8 atm. Express this pressure in each of the fol-
lowing units (I at =
14.7 psi).
A.mm Hg
B. Torr
c. Pa
d psi
Answer:
Step 1 of 3
To determine pressures in each of the different units, you need the below relations:
(a) To convert pressure in atmospheres to mm Hg, use the relation given by,
We have, initial pressure charged to the system is 4.8 atm. So, the pressure in mm Hg is So, the pressure in mm Hg is.Freon-12 is used as a refrigerant in central home air conditioners. The rate of effusion of Freon-12 to Freon-11 (molar mass = 137.4 g/mol) is 1.07:1. The formula of Freon-12 is one of the following:
\mathrm { CF } _ { 4 } , \mathrm { CF } _ { 3 } \mathrm { Cl }, \mathrm { CF } _ { 2 } \mathrm { Cl } _ { 2 } , \mathrm { CFCl } _ { 3 } , \text { or } \mathrm { CCl } _ { 4 }. CF 4 ,CF 3Cl,CF 2 Cl 2 ,CFCl 3 , or CCl 4
Explanation:
The system is initially charged to a pressure of 4.8 atm. 4.8 atm in mm Hg is 3648 mm Hg, 4.8 atm in torr is 3648 Torr, 4.8 atm in Pa is 486360Pa and 4.8 atm in Psi is 70.56 psi.
The force applied to a unit area of a surface is described by pressure, a fundamental concept in physics and chemistry. It describes how much force is distributed over a certain area.
A. mm Hg (millimeters of mercury):
1 atm = 760 mm Hg
So, 4.8 atm = 4.8 ×760 mm Hg
≈ 3648 mm Hg
B. Torr:
1 atm = 760 Torr
So, 4.8 atm = 4.8 ×760 Torr
= 3648 Torr
C. Pa (Pascals):
1 atm = 101325 Pa
So, 4.8 atm = 4.8 × 101325 Pa
≈ 486360Pa
D. psi (pounds per square inch):
Given: 1 atm = 14.7 psi
So, 4.8 atm = 4.8 ×14.7 psi
≈ 70.56 psi
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What occurs when an insoluble substance is mixed with water?
It will sink to the bottom and then dissolve.
O It will instantly dissolve in the water.
O It will dissolve after a lot of stirring and mixing.
It will remain solid and not
Answer: C
Explanation:
When an insoluble substance is mixed with water, the substance will sink to the will remain solid and not dissolve (option D).
What is insolubility?Insolubility is the quality of being insoluble i.e. cannot dissolve in a solvent.
Ideally, a solid substance called a solute mixes with solvent to form a solution. This occurs when the solute is soluble i.e. can dissolve in the solvent.
However, in a case whereby an insoluble substance is mixed with water, the substance will sink to the will remain solid and not dissolve.
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Sugar dissolves in water. Which statement best describes what is happening? (1 point) Sugar stays together but in a liquid form that can no longer be seen in the water. Sugar stays together but in a liquid form that can no longer be seen in the water. Sugar slowly melts, turning from a solid to a liquid and combining with the water. Sugar slowly melts, turning from a solid to a liquid and combining with the water. The water molecules in sugar will separate from each other and combine with the water, releasing the sweetness into the water. The water molecules in sugar will separate from each other and combine with the water, releasing the sweetness into the water. A large collection of sugar molecules break into individual molecules and disperse in the water.
Give the gradient of a graph of p against T in terms of n, R and V.
Answer:3
Explanation:
Vehicles that are propelled by a conventional gasoline engine in tandem with an
electric motor powered by batteries are called hybridelectric vehicles (HIVs).
A.True
B.False
carbon dioxide+water+Adenosine Triphosphate
How many minutes will it take for a car to Travel 3.5 miles. If it is traveling 25km/h? (1 mile = 1.609 km) ?
Answer:
It will take the car 13.5 minutes to travel 3.5 miles.