How many grams of water can be heated 75.0 celsius by the absorption of 40.0 kcal?
Answer:
8.9
Explanation:
HELP ILL MARK YOU BRAINLIEST
When compared to the standard hydrogen electrode, zinc has a reduction potential of -0.762 volts and copper a reduction potential of + 0.342 volts. What is the reduction potential when zinc and copper are connected to one another?
+0.420 volts
-0.420 volts
+1.104 volts
-1.104 volts
Answer:
I'll already answered that
Explanation:
BRAINLIEST ME PLEASE
what is the frequency of 704 nm light?
Explanation:
Sorry pa Wala. Thank God
Using the diagram below, which global winds are moving at points 1 and 6?
Question options:
Prevailing westerlies
Trade Winds
Polar Easterlies
Doldrums
Answer:
Polar Easterlies
Explanation:
Answer:
prevailing westerlies
O Which of the following determines the
identity of an element?
a. atomic number
b. mass number
c. atomic mass
d. Overall changes
Answer:
A. atomic number
Explanation:
the mass number alone cannot uniquely identify an element. But the number of protons in the nucleus identifies it uniquely. In addition, if the atom is neutral, then the atomic number also equals the number of electrons in its orbitals.
Cho muối X vào dd NaOH, đun nóng, thu được một chất khí làm xanh giấy quỳ ẩm. Chất nào sau đây thỏa mãn tính chất của X?
A.K2SO4 B.NH4NO3 C.CaCO3
D.FeCl2
Answer:c
Explanation:
Help me fill in all the blanks I’m not sure if I’m doing this correctly
Describe Bohr's atomic model
Answer:THE Bohr's atomic model is an atom as a smal, positively charged nucleus surrounded by electrons . have a good day
Which represents an empirical formula?
a)C2H4
b)B2H6
c)Al2O3
d)C6H6
Answer:
C. Al2O3
Explanation:
The empirical formula is an expression that represents the simplest proportion in which the atoms that form a chemical compound are present. It is therefore the simplest representation of a compound.
For options A, B and D the empirical formulas are as follows:
A. CH2
B. BH3
D. CH
Please help one of my friends is trying to be cool but I'm scared that they could get really hurt!
can your skin get burnt if you light hand sanitizer on fire on your skin!
Answer:
The answer is :No It won't burn.
1. In the process of convection, heat travels
a.from side to side
b.upwards
c.downwards
d.in all direction
Answer:
option d in all direction
Explanation:
very firstly you have to understand that what is convection convection is a process of heat transfer which is takes place due to molecules and you know moleculescan easily travels with any sites from side to side upwards or downwards so the answer will be in all directionHow does nitrogen return to the soil?
photosynthesis by plants
absorption by the soil
precipitation by rain
decomposition by bacteria
Answer:
photosynthesis by plant
Explanation:
when plants like lugumes are in a process of fertilization,the suck the nutrugen from the air with help from their Noddles found on their roots.
Answer:
decomposition by bacteria
Explanation:
how many grams are equal to 413 kg. [?]x10^([?])g
413000 grams thats the answer hope that helps ;]
Help with question 01.4 pleaseeee
Answer:
Is there answer choices?
Explanation:
how does density and flammability explain how carbon dioxide could be coming from the bath bomb?
The melting point is 152.7 C°, the boiling/decomposing point is 310 C°, and the density is 1.665 g/cm³. How are Bath bombs made? Baking soda is derived from soda ash.
Answer question will give brainliest
Explanation:
Elastic Potensial energy is what causes a ball to bounce or rebound because it is transformed into kinetic energy, which is then used to bring the ball back up.
what is this reaction
CaCO3 (s) → CaO (s) + CO2 (g)
Match the following scientist with his experiment or contribution
J. J. Thomson
Albert Einstein
Niels Bohr
Ernest Rutherford
John Dalton
Robert Millikan
___________________ Oil-drop experiment
___________________ Atomic theory
___________________ Cathode ray experiment
___________________ Model of the atom
___________________ Gold-foil experiment
___________________ Photoelectric effect
PLEASE HELP!!!!!
J. J. Thomson - oil drop
Albert Einstein - atomic theory
Niels Bohr - model of the atom
Ernest Rutherford - gold foil experiment
John Dalton - cathode ray tube
Robert Millikan - photoelectric effect
The correct match of the scientists with their experiment or contribution are:
J. J. Thomson - oil dropAlbert Einstein - atomic theoryNiels Bohr - model of the atomErnest Rutherford - gold foil experimentJohn Dalton - cathode ray tubeRobert Millikan - photoelectric effectWho are scientists?Scientists are those people who research in different fields, and they do discoveries of new things. They study nature and every fill for the earth to know more, and they discover and open new secrets of the earth to the people.
Albert Einstein is a famous scientist that discovered relativity and the photoelectric effect. Neil Bohr explained the model of an atom, by which every matter is made up of.
Thus, the correct match is :
J. J. Thomson - oil dropAlbert Einstein - atomic theoryNiels Bohr - model of the atomErnest Rutherford - gold foil experimentJohn Dalton - cathode ray tubeRobert Millikan - photoelectric effectTo learn more about scientists, refer to the below link:
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Draw diagrams to show the arrangement of particles in a
Salid a liquid, and a gas
Answer:
solid(particles are rightly packed)
liquid(particles are losely packed)
gas(particles move freely)
Explanation:
there u go, hope it helps
What are three ways fluid flow is important in the food industry?
Change Worksheet
answer the following questions.
The graph was drawn from data collected as a substance was heated at a constant rate. Use the graph to
180
160
Phase Change Diagrarn
140
120
Temperature (°C)
100
D
B
स
80
60
40
2
4
6
8
16
18
20
22
10 12 14
Tim e (minutes)
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has
Deontz_ volume and __ha2_shape. With each passing minute,
is added to the
substance. This causes the molecules of the substance to me more rapidly which we detect by a
t2 Maturise in the substance. At point B, the temperature of the substance is __°C. The solid
begins to_A
At point C, the substance is completely or in a mate state.
Material in this phase has_Det volume and
shape. The energy put to the substance
between minutes 5 and 9 was used to convert the substance from a 3D
This heat energy is called the latent heat of fusion. (An interesting fact.)
to a
to a
Between 9 and 13 minutes, the added energy increases the du of the substance. During the
time from point D to point E, the liquid is
By point E, the substance is completely in the
phase. Material in this phase has
volume and
shape. The energy put to the substance between minutes 13 and 18 converted the substance from a
state. This heat energy is called the latent heat of vaporization. (An
interesting fact.) Beyond point E, the substance is still in the
phase, but the molecules
are moving
as indicated by
the increasing temperature,
Substance Melting point Boiling point
Bolognium
20°C
100 °C
Which of these three substances was likely used in this
Unobtainium
40°C
140 °C
phase change experiment?
Foosium
70 °C
140°C
ONUS: For water, the value for the latent heat of vaporization is 6.8 times greater than the latent heat of fusion. Imagine we were
ding heat at a constant rate to a block of ice in a beaker on a hot plate, and it took 4 minutes for the ice to melt completely. How
uld it take, after the water started boiling, for the beaker to be completely empty (the liquid water totally converted to water van
Define the following:
A. Passive tranaport
B. Diffusion
C. Osmosis
D. Facilitated Diffusion
E. Active tranaport
F. Selectively permeable
G. Cellular respiration
Answer:
A. Passive Transport is migration of a molecule from one side of the cell membrane to the other, from an area of high electrochemical potential to a region of lower electrochemical potential.
B. Diffusion is an individual molecule of a material moving from a high-concentration location to a low-concentration area over a semipermeable barrier
C. Osmosis is the movement of molecules of water through a cell's partly permeable membrane from a liquid with a large concentration of water molecules to a solution with a lower concentration of water molecules.
D. Facilitated Diffusion are molecules that diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.
E. Active transport is the transport of molecules across a cell membrane against a concentration gradient from a low-concentration region to a high-concentration region.
F. Selectively permeable is when some chemicals or ions pass across the membrane, while others are blocked.
G. Cellular respiration are organisms mix oxygen with food molecules, directing the chemical energy in these substances into life-sustaining processes while eliminating carbon dioxide and water as waste material.
Explanation:
Answer the question below based on the periodic table entry for silicon.
What is the atomic mass?
14
28.08
2
28
Answer:
28
Explanation:
the atomic mass is the name that a downward under the element
In the notations C-12 and C-14, what do the numbers after the element
symbol and hyphen represent?
A sample of gas is measured to be 375 ml at 1.15 atm. The pressure
is increased to 2.05 atm. What is the new volume?
Answer:
Direct method:
1.15x375/2.05
=21.03mL
For the following reaction: S (s) + O2 (g) =SO2 (g) Elthalpy Change= -297kj/mol (a) Is this reaction exothermic or endothermic? (b) How does the heat content of 1 mole of SO2 compares to that of 1 mole of S plus 1 mole of O2?
Answer:
a) exothermic
b) the amonut of oxygen in one mole of oxygen is the same as that in 1 mole of sulphur dioxide
Which common substance is a base?
Question 4 options:
vinegar
lemon juice
yogurt
ammonia
Answer:
AMMONIAExplanation:
HOPE IT HELPS!!!!!
Answer:
Ammonia is a base.
Explanation:
Vinegar, lemon juice, and yogurt all have a pH under 7. If a substances pH is under 7 then it is acidic. If it is above 7 then it is a base. Ammonia has a pH above 7 therefore it is a base.
All objects emit and absorb electromagnetic radiation.
Group of answer choices
True
False
How to Represent nitrogen and magnesium with the Bohr-Rutherford model?
Nitrogen: 2 electron shells and 5 valence electrons
Magnesium: 3 electron shells 2 valence electrons
Is diphenylmenthane a solid or liquid at room temperature
Answer:
diphenylmethane is liquid at room temperature.
Explanation:
It is a solid below room temperature and its melting point is at 22 degree celsius to 24 Celsius degree celsius.
Diphenylmethane is a solid at room temperature. Diphenylmethane is a non-polar compound.
Diphenylmethane is a colorless, crystalline solid with a melting point of 53 °C. It is a member of the diphenylmethanes, which are a class of organic compounds that contain two benzene rings joined by a single carbon-carbon bond.
Diphenylmethane is a non-polar compound, which means that it does not have any permanent dipole moments. This makes it difficult for the molecules of diphenylmethane to interact with each other, which is why it is a solid at room temperature.
If diphenylmethane were a polar compound, the molecules would be able to interact with each other through dipole-dipole interactions. This would make the compound more likely to be a liquid at room temperature.
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