Answer:
D. +3
Explanation:
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Which of the following can be classified as a substance?
A. Bar of gold
B. Newspaper
C. Nail polish
D. Chocolate chip cookie
the number of oxygen atoms (O) in 0.24g of calcium carbonate Ca CO3
Answer:
4.3 × 10²¹ atoms
Explanation:
Step 1: Calculate the moles corresponding to 0.24 g of CaCO₃
The molar mass of CaCO₃ is 100.09 g/mol.
0.24 g × (1 mol/100.09 g) = 2.4 × 10⁻³ mol
Step 2: Calculate the moles of oxygen in 2.4 × 10⁻³ moles of CaCO₃
The molar ratio of CaCO₃ to O is 1:3. The moles of O are 3/1 × 2.4 × 10⁻³ mol = 7.2 × 10⁻³ mol
Step 3: Calculate the number of O atoms in 7.2 × 10⁻³ moles of O
We will use Avogadro's number: there are 6.02 × 10²³ atoms of O in 1 mole of atoms of O.
7.2 × 10⁻³ mol × (6.02 × 10²³ atoms/1 mol) = 4.3 × 10²¹ atoms
How many chloride ions are in 0.486 moles of chloride ions?
Answer:
Since in a chloride ion, we have an additional electron
you might think that it will affect the mass but the mass of an electron is almost negligible so we will ignore that
Amount of ions in 1 mol = 6.022 * 10^23
Amount of ions in 0.486 moles = 0.486 * (6.022*10^23)
Amunt of ions in 0.486 moles = 2.9 * 10^23 ions
Hence, option 1 is correct
The smallest possible particle of an element is a
Answer:
An atom is the smallest particle of an element that still has the properties of that element. Atoms, in turn, are composed of subatomic particles, including negative electrons, positive protons, and neutral neutrons. The number of protons in an atom determines the element it represents.
Explanation:
The smallest possible particle of an element is a atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
Therefore, the smallest possible particle of an element is a atom.
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what happens to energy and matter when matter is burns?
pls help :p
Select all that apply: Tonicity of a solution Check All That Apply is related to solute content.is related to solute content. is related to the pH of the solution.is related to the pH of the solution. gives information about potential changes in cell volume when cells are placed in that solution.gives information about potential changes in cell volume when cells are placed in that solution. is closely related to the temperature of the solution.is closely related to the temperature of the solution. is related to membrane permeability to solutes.
Answer:
.✓is related to the solute content
✓gives information about potential changes in cell volume when cells are placed in that solution
√is related to membrane permeability to solutes.
Explanation:
Tonicity of a solution can be explained as how an extracellular solution can give room for the liquid to move in and out of the cell through osmosis.
It should be noted that Tonicity of a solution is
.✓is related to the solute content
✓gives information about potential
changes in cell volume when cells are placed in that solution
√is related to membrane permeability to solutes.
How many atoms of Titanium are in 3 moles?
Explanation:
Because There are 6.022x10^23 atoms per mole; therefore, (6.022x10^23×3)=18.066x10^23 atoms of titanium.
WILL GIVE BRAINLIEST! <3
easterly winds usually blow from the __?__ and Easterly winds usually blow from the __?__.
east; west
west;east
west;north
north;south
Answer:easterly winds blow from east to west and westerly winds blow from west to east
Explanation:
Answer:
East; west
Explanation:
Did a packet on this, got it all right.
Hope this helps! :D
Which has the lowest density? *
Wood
Iron
Water
gold
What is commonly used to run a central heating system?
solar energy
electrical energy
geothermal energy
nuclear energy
Is table salt a mixture ?
True
False
Answer:
True
Explanation:
Table sugar and table salt are pure substances....When elements chemically combine, they form compounds that have properties that are similar to those of the uncombined elements.
Identify the number with the correct number of significant figures for each step of the calculation and for the final answer. Note that 2 is an exact number. y equals 2.10 StartBracket 9.0 plus 2 times 35.35 EndBracket. 2 (35.35) =
Answer: The answer is 167
Explanation: This is because that was right on edg. so yea heart this tho plsss
Answer:
70.70
Explanation:
Just got it right on edge
you are exploring a system of caves. You have ignored safety regulations and have not brought a partner. While spelunking you drop your flashlight and the on/off button breaks. in order to repair it, you must find something that can conduct electricity and complete the circuit in the flashlight. You feel around you in the darkness and find a few different items. Which could work ?
A. you find a small mineral formation behind you that is yellow and smells, are are sure it is sulfur(S).
B. you have a flare for emergencies, which has a strip of magnesium (Mg) in it that you could remove.
C. You find a match. The head of a match is mostly covered in phosphorus (P).
D. you have a bottle of iodine (I) tablets as a vitamin supplement
Answer:
i think js b...........
While spelunking you drop your flashlight and the on/off button breaks. in order to repair it, "you have a flair for emergencies, which has a strip of magnesium (Mg) in it that you could remove."
What is spelunking?The main distinction between the two must be why each person is just exploring the cave. Spelunking would be the term used when someone enters a cave purely for fun and an adrenaline rush. On the other side, caving would be the practice of exploring caves for biological or conservation purposes.
What is magnesium?Magnesium is a kind of element which has the atomic number 12.
you are exploring a system of caves. You have ignored safety regulations and have not brought a partner. While spelunking you drop your flashlight and the on/off button breaks. in order to repair it, you must find something that can conduct electricity and complete the circuit in the flashlight. You feel around you in the darkness and find a few different items. You have a flair for emergencies, which has a strip of magnesium (Mg) in it that you could remove.
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Name element atomic mass 26 mass number 58 with charge of 2+
Answer:
subtract the answer it'll get you that.
Explanation:
Question :
Melting gold to make new earring is
a
O Physical Change
O
Chemical Change
O
Periodic change
O
Irreversible
Answer:
If the earring is still gold it is a physical change.
Explanation:
Melting something can be a chemical change but since the gold is still gold its physical. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice. The water molecules are still water molecules.
the percent water in ZnSO4.7H20.
Answer:
Approximately [tex]43.9\%[/tex] by mass.
Explanation:
Look up relevant relative atomic mass data on a modern periodic table:
[tex]\rm Zn[/tex]: [tex]65.38[/tex].[tex]\rm S[/tex]: [tex]32.06[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex]Calculate the formula mass of [tex]\rm ZnSO_4[/tex], [tex]\rm H_2O[/tex], and [tex]\rm ZnSO_4\cdot 7\, H_2O[/tex]:
[tex]M(\rm ZnSO_4) \approx 65.38 + 32.06 + 4 \times 15.999 = 161.436\; \rm g \cdot mol^{-1}[/tex].
[tex]M(\rm H_2O) \approx 2 \times 1.008 + 15.999 = 18.015\rm g \cdot mol^{-1}[/tex].
[tex]M(\rm ZnSO_4\cdot 7\, H_2O) \approx 161.436 + 7 \times 18.015 \approx 287.541\; \rm g\cdot mol^{-1}[/tex].
In other words, each mole of [tex]\rm ZnSO_4\cdot 7\, H_2O[/tex] formula units has a mass of approximately [tex]287.541\; \rm g[/tex].
However, that one mole of [tex]\rm ZnSO_4\cdot 7\, H_2O[/tex] also contains seven moles of [tex]\rm H_2O[/tex] molecules, which has a mass of approximately [tex]7 \times 18.015 = 126.105\; \rm g[/tex].
Calculate the mass ratio of water in this compound:
[tex]\begin{aligned}& \%m(\text{water}) \\ &= \frac{m(\text{water})}{m(\text{compound})} \times 100\% \\ &\approx \frac{126.105\; \rm g}{287.541\; \rm g} \times 100\%\approx 43.9\%\end{aligned}[/tex].
2
3
4
5
20
Which refers to any disturbance that carries energy from one place to another?
wave
O trough
O motion
O crest
Answer:
its A) wave
Explanation:
edge2020
Answer:
A: Wave
Explanation:
Got it right on edge
15. Excited sodium atoms emit light in the infrared at 589 nm. What is the energy of a single photon with this wavelength?
Answer:
3.36 × 10^-19 J
Explanation:
From the formula;
E= hc/wavelength
h= 6.6 ×10^-34 Js
c= 3 × 10^8 ms-1
Wavelength= 589 ×10^-9 m
E= hc/ wavelength
E=6.6 ×10^-34 × 3 × 10^-8/ 589 ×10^-9
E= 3.36 × 10^-19 J
Calculate the mass of water change if the density is 1.02 g/ml and the volume is 62 ml?
Answer:
65.72 g
Explanation:
mass = density × volume
= 1.02 g/ml × 62 ml
= 65.72 g
How many σ and π bonds are in this molecule? A chain of five carbon atoms. There is a double bond between the first and second carbon atoms and a triple bond between the fourth the fifth carbon atoms. There are single bonds between the remaining carbon atoms. There are two hydrogen atoms bonded to the first carbon atom through single bonds, and a single hydrogen atom bonded to both the second and fifth carbon atoms through single bonds. There is an oxygen atom bonded to the third carbon atom through a double bond.
Answer:
Sigma bonds: 10
Pi bonds: 4
Explanation:
The compound described must be CH2=CH-CO-CH≡CH. If we look at the compound closely, we will notice that there are 10 sigma bonds and 4 pi bonds.
There are three pi bonds between carbon atoms and one pi bond between a carbon and an oxygen atom (C=O). All these can easily be seen in the structure of the formula chosen in this answer.
The total number of sigma bonds in the given structure are 9. The total number of pi bonds in the given structure are 4.
The given hydrocarbon has the structure of:
[tex]\rm CH_2=CH-C(=O)-C\equiv CH[/tex].
The pie bonds are the unsaturated bonds, formed by the electron clouds. The double and triple bonds are pi bonds.
In the given structure number of pi bonds are:
1 pi bond between 1st Carbon and 2nd Carbon1 pi bond between 3rd Carbon and Oxygen2 pi bonds between 4th Carbon and 5th carbon.Thus the total number of pi bonds in the given structure are 4.
The sigma bonds are the covalent bonds, formed by the sharing of electrons. The single bonds are sigma bonds.
The number of sigma bonds are;
1st Carbon has 2 sigma bond with hydrogen and 1 sigma bond with 2nd Carbon.2nd Carbon has 1 sigma bond with hydrogen, and 1 sigma bond with 3rd Carbon3rd Carbon has 1 sigma bond with oxygen, and 1 sigma bond with 4th Carbon4th Carbon has 1 sigma bond with fifth carbon.5th Carbon has 1 sigma bond with hydrogen.Thus the total number of sigma bonds in the given structure are 9.
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Select the correct answer.
In which research method does a researcher change the value of one variable to determine how the change affects another variable?
O A experiment
OB. observational research
Oc.
survey
OD
case study
Answer:
experiment is the answer
Which of the following statements describes the interaction of water molecules with phospholipids? Which of the following statements describes the interaction of water molecules with phospholipids? The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract). The polar heads interact with water; the nonpolar tails do not. Phospholipids do not interact with water because water is polar and lipids are nonpolar. Phospholipids dissolve in water.
Answer:
The polar heads interact with water; the nonpolar tails do not
Explanation:
A phospholipid contains an ionic head that contains the phosphate group and the nonpolar or hydrophilic tail that is comprised of the alkyl moeity in the phospholipid.
The hydrophilic ionic head can interact with water, while the hydrophilic alkyl tail do not interact with water, hence the answer above.
A mole of an element in solid state is about the size of a(n)
Explanation:
The method to express the amount of substance is called mole concept. The amount of substance that contains 6.023 × 10²³ particles is equivalent to 1 mole. It is equal to the size of a molecule in solid-state. No of moles can be calculated as mass divided by molar mass or the molecular mass. Hence, A mole of an element in solid state is about the size of a molecule.
What are the steps to finding an items density?
Identify each type of bond:
Answer:
The type of bond between the Oxygen atom and the hydrogen is Covalent
this is because the 2 electrons are being shared by both hydrogen and oxygen
The type of bond this molecule makes as a whole is called a Hydrogen Bond
A hydrogen bond is formed because of the partial +ve and -ve charge in a molecule
The cause of the partial +ve and -ve charge is the comparatively high electronegativity of oxygen which makes the electron get attracted towards the oxygen atom while the hydrogens try to maintain the maximum distance from the lone pairs due to repulsion
Hope it helped
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During which changes of state does the motion of the atoms decrease?
Answer:
the motion of atoms decrease when there is a decrease in velocity and kinetic energy that is decrease in temperature. this occurs during freezing and condensation.
Explanation:
Different ____ of an element have different numbers of neutrons
Answer:
different elements have different numbers of neutrons.
Will global warming affect ocean currents?
Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol
Answer:
Explanation: Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol
What is the symbol for the element with the atomic number 8
Answer: O
Explanation: oxygen
