Answer:
deuterium oxide
what is the smallest unit of an element that still has all the properties of that element?
Answer:
An Atom
Explanation:
This is the smallest unit which still has the properties of an element.
A radioactive isotope has a half-life of 2 minutes. How many total minutes will it take for 100-g of the isotope to get to just 6.25-g remaining
Answer:
It would take 12 minutes.
Answer:
8 minutes
Explanation:
G(g) T(min)
100 --------------- 0
50-------------------2
25 -------------------4
12.5 --------------- 6
6.25 ----------------8
another way:
100/6.25 = 16
16 = 2⁴ ( 4 half lives)
Each half life is 2 minutes
so 4 half lives will be 8 minutes
12. Gavin is having a difficult time
moving his sofa across the living
room. He decides to place wheels on the legs of the sofa to make it easier, Which of the following forces is Gavin overcoming?
A Gravity
B Friction
C Buoyant force
D Unbalanced force
Answer:
Friction
Explanation:
the resistance that one surface or object encounters when moving over another.
Do chemical formulas have charge even though they may be made from ions
Question 12 (ID=1798500)
In which state of matter are the molecules spaced farthest apart?
A: A gas
B: A liquid
C: A solid
D: All are equal
Answer:
A gasss
Explanation:
they have enough kinetic energy that the effect of the intermolecular forces is small and they are spaced very apart from each other
dehydration of tertiary alcohols occurs by what mechanism?
Answer:
An EL mechanism
Explanation:
I looked this up, it's called an EL mechanism
Which is not true? Question 1 options: Cold currents cause nearby coastlines to be colder. Warm currents cause nearby coastlines to be warmer. Oceans move more slowly than wind. Oceans hold more heat than atmosphere on land. Currents are made by wind blowing over the water.
Currents are made by wind blowing over the water.
Explanation:Currents created by wind are formed through the use of warm and cold air. The warm air becomes lighter through expansion, causing it to rise and transform into a warm air current. Cool air is heavier than the warm air, which makes it move to replace the warm air, thus forming a cool air current.
In short, currents are not made by wind blowing over water, but by the characteristics of warm and cool air acting on one another.
Additionally, the rest of the answers can easily be proven true.
Cold currents do cause nearby coastlines to become colder. This is because these winds blow into the coast and affect the temperature. The process also applies to warm air. Warm air can blow into the coastline and warm the area. (With this, both "Cold currents cause nearby coastlines to be colder," and "Warm currents cause nearby coastlines to be warmer," have been shown to be truthful.)
Oceans more more slowly than wind is also correct. The ocean is an uninterrupted surface which winds can peacefully blow across. This lack of disruption causes the winds to move quickly - much faster than even the ocean itself. The ocean('s) currents move slower than the winds. (Therefore, "Oceans move more slowly than wind," had been proven true.)
Oceans hold more heat than atmosphere on land has a simple explanation: the Sun. As we know, this humongous, fiery star we depend on for survival spreads its sunlight all over Earth. The oceans are no exception. The ocean(s) absorb(s) this sunlight and transform(s) it to heat and energy. Since water has a higher capacity for heat compared to air, it can store larger amounts of heat with less of a change in temperature (than air). (For that reason, "Oceans hold more heat than atmosphere on land," is indeed a factual statement.)
All of the options, apart from Currents are made by wind blowing over the water, have been proven true. With that being said, our answer is clear. (Hope this helps - have a lovely week!)
Answer:
currents are made by wind blowing over the water
Explanation:
In which direction does weather typically move? a. from east to west c. from north to south b. from west to east d. from south to north *this is the next question on the test and the answer is FROM WEST TO EAST*
Which of these describe a warm front?
Warm and cool air mass that are not strong enough to move one another
Cold air meets warm air, fast moving and stormy. Severe weather is likely.
Warm air meets cold air. Slow moving with less severe weather.
Ocean surface temperature is greater than 80F.
*these are the third question answers and there are no brainly answers online, so the answer to this one is, WARM AIR MEETS COLD AIR. SLOW MOVING WITH LESS SEVERE WEATHER.*
hope this helps :)
Which statement best describes a physical change?
Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.
Answer:
The answer should be C.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
Physical changes can occur to a substance without changing the chemical properties.
For example:
If you change your hair color, your personality would not change as well. So you are right, it is C!
Hope this helps!
The specific heat of solid water (ice) and liquid water are 2.03 J/gºC and 4.18 J/gºC respectively. Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. Calculate the heat of fusion of water in J/g. Assume the melting point of water is 0 °C.
Taking into account the definition of calorimetry, sensible heat and latent heat, the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
Latent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
In this case:
-25 °C to 0 °CIn firts place, you know that the melting point of water is 0°C. So, first of all you must increase the temperature from -25° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).
The amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c(solid)= 2.03 [tex]\frac{J}{gC}[/tex] m= 49.3 g ΔT= Tfinal - Tinitial= 0 °C - (-25 °C)= 25 °CReplacing:
Q1= 2.03[tex]\frac{J}{gC}[/tex] × 49.3 g× 25 °C
Solving:
Q1=2501.975 J=2.501975 kJ≅ 2.50 kJ
Change of stateThe heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
In this case, you know:
m= 49.3 gΔHfus= ?Replacing:
Q2= 49.3 g× ΔHfus
0 °C to 44.7 °CSimilar to sensible heat previously calculated, you know:
c(liquid)= 4.18 [tex]\frac{J}{gC}[/tex] m= 49.3 g ΔT= Tfinal - Tinitial= 44.7°C - 0°C= 44.7 °CReplacing:
Q3= 4.18[tex]\frac{J}{gC}[/tex] × 49.3 g× 44.7 °C
Solving:
Q3= 9211.5078 J=9.2115078 kJ≅ 9.21 kJ
Total heat requiredThe total heat required is calculated as:
Total heat required= Q1 + Q2 + Q3
Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ
Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:
28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ
Solving:
28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus
28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus
16.52 kJ = 49.3 g× ΔHfus
16.52 kJ ÷ 49.3 g= ΔHfus
0.335091[tex]\frac{kJ}{g}[/tex]= 335.091 [tex]\frac{J}{g}[/tex] =ΔHfus
In summary, the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .
Learn more:
brainly.com/question/14057615?referrer=searchResults brainly.com/question/24988785?referrer=searchResults brainly.com/question/21315372?referrer=searchResults brainly.com/question/13959344?referrer=searchResults brainly.com/question/14309811?referrer=searchResults brainly.com/question/23578297?referrer=searchResultsAn atom of zinc that contains 30 protons and 38 neutrons would be named what
Answer:
Explanation:
30+38
so this is the isosotope of Zn that weighs 68
-so Zn68
Does the coating from another type of candy dissolve in water like M&M’s ?
Claim
Evidence
Reasoning
The candy coating of the M&M is made of sugar and colored dye. When water comes into contact with the sugary coating, the positive and negative charges in the water molecules pull on the negative and positive charges in the sugary coating, and the coating dissolves.
Balancing Chemical Equation
Na+Br2=NaBr
Answer:
2Na + Br2 = 2NaBr
Explanation:
In order to balance a chemical equation you make the make sure both sides have the same number of atoms on each side, you do this by multiplying on both sides as if it was a algebraic equation.
Na+ Br2 = NaBr
Na × 2 = Na2
Na × 2 = Na2
Br × 2 = Br2
2Na + Br2 = 2NaBr
Hope this helps.
Rutherford concluded from his calculations that the volume of an atom Multiple Choice is filled with protons, neutrons and electrons. is mostly protons, with electrons revolving around the outside. is filled with electrons. is mostly empty space.
Answer: D is mostly empty space
Explanation: Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. Found this with his gold foil experiment
answer asap!!!!!!!!!!!!!!!!!!!!!!!!!!11
You have 2 clear liquids. One turns blue litmus paper red and one turns red litmus paper blue. If you mix them and retest with both litmus papers, no color changes occur. Describe the reaction that took place when the liquids were mixed.
Answer:
a synthesis reaction occured when the liquids were mixed
Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen?
Answer:
Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? The two systems must be the same temperature. The two systems must not be touching each another.
Use the problem below to answer the question:
34 grams of carbon reacted with an unlimited amount of H20. The reaction is:
C + H2O CO + H2
The atomic mass of C is 12.01 g/mole. The atomic mass of H2 is 2.016 g/mole. Finish the problem by choosing the
correct format for dimensional analysis.
Answer:
34 grams of carbon is approx. 2.833 moles
Explanation:
What energy transformation takes place when you turn on an electric light?
Chemical - light + heat
Mechanical - light + heat
Electrical - light + heat
Chemical electrical + heat
Answer:
Electrical- light + heat
Explanation:
By turning on the light Electricity energy takes place which gives us light energy which generates heat
The individual particles in an ionic solid are held together as a result of:
electrostatic force
Explanation:
In ionic bonds one atom is positively charged (the atom that gives its electrons), and the other atom is negatively charged (the atom that receives the electrons); therefore, it is the opposite charge of the ions that attracts them to one another and holds them together with electrostatic force.
Suppose a solid object is fully immersed in a liquid, but B is larger than w. Is this possible at all
This problem is stating a situation in which a solid object is fully immersed in a liquid and the buoyant force is larger that its weight, so that you need to discuss whether this is possible or not.
In general terms, it is necessary to keep in mind that when the buoyant force is larger than its weight, the object will float. On the other side, when the buoyant force is smaller than the weight, then the object will sink.
It means that it could be possible to have this scenario under specific conditions. Now, the Archimedes' principle can be applied with the following version:
[tex]F_B+W>m_{obj}*a\\\\\rho _{fluid}*V*g+m_{obj}*g>m_{obj}*a\\\\\rho _{fluid}*V-m_{obj}>m_{obj}*a[/tex]
It means that the object can move down the liquid if has a significant acceleration (could be external), even when the buoyant force is larger than the weight
Learn more:
https://brainly.com/question/18103369https://brainly.com/question/14271593when 25 ml of 0.12 m aqueous ammonia is titrated with 0.12 m hydrobromic acid, what is the ph at the equivalence point?
The pH value will be equal to 3.29 at the equivalence point.
What is titration?Titration is the laboratory method that is performed to determine the concentration of the analyte. An indicator is used to know the equivalence point.
Given the concentration of HBr = 0.12 M
The concentration of ammonia = 0.12 M
The value of Kb for ammonia = 1.8 ×10⁻⁵
The chemical reaction is :[tex]NH_3 + HCl \longrightarrow NH^+_4 + Cl^-[/tex]
For the ammonia: NH₃ NH₄⁺ H⁺
Initial conc.: 0.12 M ---- -----
Change: - x + x +x
At equilibrium: 0.12-x x x
The acid dissociation constant :[tex]K_a =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]
[tex]\frac{K_w}{K_b} =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]
[tex]\frac{1\times 10^{-14}}{1.8\times 10^{-5}} =\frac{(x)(x)}{(0.12-x)}[/tex]
[tex]5.56\times 10^{-10}=\frac{x^2}{0.12-x}[/tex]
x² + 5.56× 10⁻⁵ x- 46.33 × 10⁻¹⁰ = 0
x = 4.57 × 10⁻⁵
The concentration of hydrogen ions = 4.57 × 10⁻⁵
The pH value = - log [H⁺]
pH = -log [4.57 × 10⁻⁵]
pH = 3.29
Learn more about titration, here:
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Given the reaction:
2KClO3 -> 2KCl + 3O2.
How many moles of O2 are produced when 4.0 moles of KCl are produced?
Answer:
6 moles of O2
Explanation:
2KClO3 -> 2KCl + 3O2
How many moles of O2 are produced when 4.0 moles of KCl are produced?
For every 2 moles of KCl 3 moles of O2 are produced
so for 4 moles of KCl, 6 moles of O2 are produced
In a cell, what is the function of the cell membrane?
A.
It only maintains the cell shape.
B.
It controls the entry and exit of substances.
C.
It generates energy for the cell.
D.
It removes waste and stores ingested food.
Answer:
b it controls the entry and exit of substances
what products or services are un demand in your community
CBD oils and products (profitable products) ...
Eco-friendly products (top trending products) ...
Natural skincare and cosmetics (popular beauty products) ...
Specialty teas (fast-selling items) ...
Diet fad-products (ideal for target audiences)
My atomic mass is 35.453
Answer:
Chlorine Cl atomic # 17, atomic mass 35.453
Explanation:
My atomic mass is 35.453
Dmitri Mendeleev discovered the Periodic Table using atomic mass
look at your periodic table
only ONE element has an atomic mass of 35.453
Chlorine Cl atomic # 17, atomic mass 35.453
The smallest unit of a covalent compound that still retains the properties of the compound is called a(n) Multiple Choice electron. atom. molecule. dipole.
Answer: the answer is molecules
A molecule is the smallest particle of a covalent compound that still has the properties of the compound.
Which object would be the BEST to use and why?
A
The radio because it can be powered using batteries or electricity.
B
The clock because the pendulum begins to swing when it has a source of power.
C
The light bulb in a lamp because electricity leads to a chemical reaction in the light bulb.
D
The bottle of soda because the liquid soda heats up when the temperature is increased when it is left in the sun.
Answer:
B
Explanation:
The Bergeron process causes cloud droplets to grow because
A. freezing nuclei are much more common in the atmosphere than other condensation nuclei.
B. water freezes instantly when its temperature reaches 0 degrees
C. the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.
D. larger drops fall and collect smaller droplets in the cloud.
Answer: C. the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets
The Bergeron process causes cloud droplets to grow because, the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.
What is Bergeron process ?Physical transformations from a cloud of extremely small droplets to much bigger precipitation-sized particles that fall to the earth require a number of intricate and poorly understood physical processes.
The process of collision and coalescence, in which colliding droplets expand by merging together or coalescing, is how droplets form in warm clouds, those that solely contain liquid water.
Larger droplets pass through tiny droplets more quickly because they descend at a faster rate than the smaller ones. Strong updrafts (rising air currents) can produce cloud raindrops, just like hail, since they let heavier drops to stay suspended in the cloud.
Bergeron's process causes precipitation-sized particles to develop in cool clouds. Hence, option C is correct.
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what type of intermolecular force causes the dissolution of nacl in water?
Answer:
When NaCl is dissolved in water, it dissociates into Na+ and Cl− . These ions can be attracted strongly to the partial negative end and partial positive end of the water molecule.
Explanation:
Hence, the major intermolecular forces that contribute to the dissolution of NaCl in water are ion-dipole forces.
Through which of the following room-temperature substances would sound travel the slowest? a water b rubbing alcohol c oxygen d glass
Answer:
id say oxigan
Explanation:
i dont realy know but if im rong correct me
Answer:
Oxygen
Explanation:
Sound energy vibrates atoms andecause of this phenomenon, sound moves at a higher speed through solids than through liquids. Sound moves at its slowest speeds through gases. molecules of matter as it travels through a medium. The more tightly packed the particles of a medium, the faster sound energy will transfer through it.
