Answer:
Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements. All elements are pure substances.
Explanation:
PLEASE MARK ME AS BRAINLIEST
If Angie knows that baking soda reacts with vinegar producing CO2, what conclusion can she draw from this experiment?
A
CO2 has the capacity to combust in the air around the flame and extinguish it.
B
CO2 can displace oxygen around the flame because it has a lower density than air.
C
CO2 can displace oxygen around the flame because it has a higher density than air.
D
CO2 has the capacity to absorb the heat of the air around the flame and extinguish it.
Answer:
Option C:
CO2 can displace oxygen around the flame because it has a higher density than air.
Explanation:
CO2 is heavier - or in this case, we can say denser than air. In addition to that, CO2 does not support burning. t is a major component in fire extinguishers that are designed to stop minor domestic fire incidents.
Since CO2 is denser than air, it sinks to the bottom of the room, and surrounds the flame with an atmoshphere inert to combustion, pushing the oxygen upwards in the process, away from the reach of the flames.
This causes the fire to starve to death from lack of oxygen
What would be the new pressure if a gas at 1 atm pressure and 20c was heated to 80c
Answer:I think it’s
Explanation:
190c
How are cancer cells different that normal cells
Answer:
I have that same photo (I always where that combo lol)
Explanation:
In contrast to normal cells, cancer cells don't stop growing and dividing, this uncontrolled cell growth results in the formation of a tumor. Cancer cells have more genetic changes compared to normal cells, however not all changes cause cancer, they may be a result of it.
Answer: Can i have Brainliest & 100 POINTS
Explanation:
03:58:40
If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?
Total energy increases.
Stored energy decreases.
Energy of motion decreases.
Total energy decreases.
Answer:
If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result? Total energy increases.
Answer:
its C energy of motion decreases
Explanation:
i got it right on the edge 2021 unit test UvU
and if u dont trust me then get it rong with the other person （︶^︶）
Which of the following was NOT used in support of the continental drift hypothesis?
fossil evidence
fit of South America and Africa
mountain ranges across continents
differences in ocean salinity levels
Answer:
fossil evidence
fit of South America and Africa
Explanation: can i have brainlist please
Explain the trend you see in your graph and explain why this occurs at a particle level what is happening when the volume or pressure increases what does the particles do within the sample explain this concept in detail
Answer:
incline
Explanation:
Plisss help I’ll give you brainless Waves can be identified in many different ways. Using the diagram below, identify
which property of a wave is shown by the part of the diagram labeled F?
Answer:
Wavelength
Explanation:
how can you tell which compound in a solution is the solvent?
(own words please)
Answer:
The way you can know which compound in a solution is a solvent is by usually just determining which substance is a solute and which is a solvent. The solute is when it is dissolved and it takes on the characteristics of the solvent.
Explanation:
Hope this helps!
What is diffusion?
Class 9th
Chemistry
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration . Diffusion happens in liquids and gases because their particles move randomly from place to place . Diffusion is an important process for living things ; it is how substances move in and out of cells .
Pls follow me and Mark as brainlest :-)
Answer:
diffusion is a means of transport, which occurs through cells . for example exchange of gases that takes place in alveoli occurs due to diffusion.
Explanation:
in diffusion the object or fluid moves from region of higher concentration to the region of lower concentration.
A carpenter uses a saw to cut a wooden board into two different sized pieces. Which of the following physical properties is most
likely to be the same for both pieces of wood?
1. density
2. mass
3. volume
4. weight
Give a brief background of the development of nuclear power.
Answer:
Nuclear began in the 1930s, when physicist Enrico Fermi first showed that neutrons could split atoms. Fermi led a team that in 1942 achieved the first nuclear chain reaction, under a stadium at the University of Chicago
what is ionizable hydrogen and why we say it replaceable hydrogen
Answer:
only hydrogen atoms that are part of a highly polar covalent bond are ionizable. The hydrogen atom is attracted to the lone pair of electrons in a water molecule when HCl is dissolved in water. The result is that the H−Cl bond breaks, with both bonding electrons remaining with the Cl, forming a chloride ion.
Explanation:
Answer:
In an acid molecule, hydrogen atoms may be substituted by metal atoms.
Explanation:
It is ionizable only to hydrogen atoms that are part of a strongly polar covalent bond. As HCl is dissolved in water, the hydrogen atom is drawn to the lone pair of electrons in a water molecule. The effect is that the H-Cl bond splits, with the Cl remaining with both bonding electrons, forming a chloride ion.
what is the formula for copper (iii) selenide?
Answer:
compound formula is CuSe is answer.
Explanation:
I hope it's helpful!
Removing tropical rain forests has a _____ effect on climate.
a. warming
b. cooling
An erupting volcano has a _____ effect on climate.
a. cooling
b. warming
Answer:
1. a) warming
2. a) cooling
Explanation:
1. Deforestation leads to more carbon dioxide and less oxygen in the atmosphere, because trees are in charge of taking in CO2 and releasing O2. More of the sun's radiation is reflected back to Earth if there's more CO2 in the atmosphere, which is why it has a warming effect on climate.
2. During a volcanic eruption, a volcano releases ash or dust particles that shade sunlight, which causes temporary cooling. The smallest particles can stay in the stratosphere for months, blocking sunlight, causing a long cooling effect on climate.
How many moles are in 6.7x10^23 formula units of NaCI?
A. 872 moles.
B. 3.87x10^24 moles.
C. 21.07 moles.
D. 1.1 moles.
Answer:
UNIT 10
1.) A cylinder is filled with 2.00 moles of nitrogen, 3.00 moles of . If
the gas mixture is at STP, what is the partial pressure of the argon?
(A) 152 torr (B) 228 torr (C) 380. torr (D) 760. torr
2.) Compared to the average kinetic energy of 1 mole of water at 0 oC, the average kinetic energy
of 1 mole of water at 298 K is
(A) the same, and the number of molecules is the same
3.) If the pressure on a given mass of gas in a closed system is increased and the temperature
remains constant, the volume of the gas will
(A) decrease (B) increase (C) remain the same
4.) Which gas has approximately the same density as C2H6 at STP?
(A) NO (B) NH3 (C) H2S (D) SO2
5.) At a temperature of 273 K, a 400. milliliter gas sample has a pressure of 760. millimeters of
mercury. If the pressure is changed to 380. millimeters of mercury, at which temperature will
this gas sample have a volume of 551 milliliters?
(A) 100 K (B) 188 K (C) 273 K (D) 546 K
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A small amount of solid potassium dichromate is added to water and stirred until all of the solid has dissolved and a clear orange liquid is produced. This process may be described as: Group of answer choices the formation of a heterogeneous mixture. dissolution of the molecular compound sublimation. dissolution and dissociation of the ionic compound.
Answer: dissolution and dissociation of the ionic compound.
Explanation:
Ionic compound is formed by the transfer of electrons.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here potassium metal forms [tex]K^+[/tex] cation and [tex]Cr_2O_7^{2-}[/tex] anion which exchange their oxidation states to form [tex]K_2Cr_2O_7[/tex].
When ionic compound is dissolved in water, it dissociates to its respective ions.The ions form bonds with oppositely charged ions of water molecules and thus get dissolved in water called as dissolution.
Please help me, Thank you!
Answer:
B. Opposite
Explanation:
When one electron is transferred from sodium to chlorine, a pair of ions with oppositely charged ions is formed.
The electrostatic attraction between the ions forms a covalent bond between them.
When atoms lose or gain electrons, they become ions due to the charge imbalance within them. If sodium lose an electron, it becomes positively charged. when the electron is gained by chlorine, it becomes negatively charged These oppositely charged ions combined to form the ionic compound.percent composition for Na2S
Answer:
i gotchu my g
Explanation:
Element Symbol Mass Percent
Sodium Na 58.914%
Sulfur S 41.086%
If wind is eroding an area at a rate of 2 mm per year and depositing it in a smaller area at a rate of 7 mm per year, how much lower will the first area be in meters after 2 thousand years? How much higher will the second area be?
Answer:
After 2000 years, the first after will be 4m lower.
After 2000 years, the second area will be 14m higher.
Explanation:
From the given information:
At the first area:
if the wind is eroding at 2 mm/year, then after 2000 years; we have:
2 mm/year × 2000 year = 4000 mm
4000 mm to meters, we have:
[tex]=4000 \ mm \times \dfrac{1 \ m}{ 1000 \ mm}[/tex]
= 4 m lower
At the second smaller area:
Given that the wind is depositing it at the rate of 7 mm per year;
Then:
7 mm/year × 2000 year = 14000 mm
[tex]=14000 \ mm \times \dfrac{1 \ m}{ 1000 \ mm}[/tex]
=14 m higher
Compare heat and thermal energy. Correct answers please. Or I’ll report you(:
a Use carbon's position in the Periodic Table to explain why carbon normally
forms four covalent bonds.
1. List the types of fronts found on this map
Answer:
Cold Front. A side view of a cold front (A, top) and how it is represented on a weather map (B, bottom). ...
Warm Front. ...
Stationary Front. ...
Occluded Front.
What does the Atomic Number tell you? the amounr of electronstprorons
How can you find the number of electron shells by looking at an Atom's location on the Periodic Table?
Answer
Atomic number or proton number tells us the number of protons found in the nucleus of every atom of that element
Explanation:
Is nitrogen an element or compound?
Answer:
Nitrogen is an element that can combine with itself or with other elements to make different compounds. For instance nitrogen gas, N2, is a compound made when two nitrogen atoms form a chemical bond.
Explanation:
Answer:
element
Explanation:
it can combine with itself or with other elements to make compounds
Please help me, Thank you!
Sarah throws a ball to Billy, but it does not go far enough for him to catch it. What must Sarah apply to her next throw in order for it to reach Billy?
Answer:
Power
Explanation:
That’s the answer
Temperature is a measure of __________ movement.
Hint: It includes two words.
Answer:
Kinetic Energy
Explanation:
Temperature is a measure of the average kinetic energy of the particles in a substance. And also Kinetic Energy has 2 words.
Convert the following word equations into formula equations by changing element and compound names into chemical formulas.
1. sodium + oxygen → sodium oxide
2. copper + silver nitrate → copper(II) nitrate + silver
3. aluminum chlorate + barium sulfate → aluminum sulfate + barium chlorate
4. bromine + calcium iodide → calcium bromide + iodine
5. zinc sulfide + magnesium arsenate → zinc arsenate + magnesium sulfide
6. cobalt + lead(II) nitrite → cobalt(III) nitrite + lead
7. potassium + water → potassium hydroxide + hydrogen
Answer:
Na + O.2 = NaO.2 whereas Cu + AgNo3 = Cu.2No.3 +AG
The given reactions can be converted to equations as follows:
1. 2 Na + O2 → 2 Na2O
2. Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
What is a balanced chemical equation ?A balanced chemical equation is a representation of a chemical reaction using chemical formulas of reactants and products. It shows the number of atoms of each element on both the reactant and product sides of the equation.
The equation is balanced when the number of atoms of each element is the same on both sides of the equation.
The given reactions can be written as balanced equations as follows:
2 Na + O₂ → 2 Na₂O2. Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag2 Al(ClO₃)₃ + 3 BaSO4 → Al2(SO₄)₃ + 3 Ba(ClO₃)₂Br₂ + CaI₂ → CaBr₂ + I₂ZnS + Mg₃(AsO₄)2 → Zn₃(AsO₄)₂ + 3 MgSCo + 2 Pb(NO₂)₂ → Co(NO₂)₂ + 2 Pb2 K + 2 H₂O → 2 KOH + H₂Find more on balanced chemical equations :
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A 0.200 M NaOH solution was used to titrate a 18.25 mL HF
solution. The endpoint was reached after 31.20 mL of titrant
were added. Find the molar concentration of the original HF
solution.
Answer:
The molar concentration of HF is 0.34 M
Explanation:
Given data:
Molarity of NaOH =M₁ = 0.200 M
Volume of HF =V₂= 18.25 mL
Volume of NaOH added = V₁ = 31.20 mL
Molarity of HF solution = M₂ = ?
Solution:
M₁V₁ = M₂V₂
by putting values,
0.200 M × 31.20 mL = M₂ × 18.25 mL
M₂ = 0.200 M × 31.20 mL / 18.25 mL
M₂ = 6.24 M.mL / 18.25 mL
M₂ = 0.34 M
Thus, the molar concentration of HF is 0.34 M.
What percent of FeSO4 • 6H20 is Fe?
The percentage of FeSO4 • 6H20 is Fe is 36.04%.
What is FeSO4 ?The iron sulphate or ferrous sulphate is a range of salts with the formula of FeSO4. These are the compounds that exist with the heptahydrate.
The ferrous sulphate is mainly used as a preprocessor for the iron compounds. It is a reducing agent and can be seen in cement to lessen the toxic compounds. It generally consists of 20 to 30% of the elemental, iron per mg of the mineral.
Find out more information about the FeSO4 • 6H20.
brainly.com/question/21003796.
