Answer:
3
Explanation:
What is a watt, which is a unit of power,equal to?
A joule divided by a meter
A joule times a meter
A joule times a second
A joule divided by a second
Answer:
A joule divided a second
Explanation:
i took the test
plz give me brainlist :)
Can somebody please explain the heat formula to me? q=mcΔt
Thank you!!
Answer:
Explanation:
It describes how much heat must be added to a unit of mass of a given substance to raise its temperature by one degree Celsius. ... The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: Q=mcΔT.
Answer:
The formula q=mcΔt explained below
Explanation:
so q represents the amount of heat energy. M is the mass of the object and c is the temperature of the object. Δt also known as delta is the change in temperature. It would be the final temperature minus the original temperature.
What property of helium could be used to separate it from natural gas?
Answer: temperature liquefaction
Explanation: At the exact time the only used method or strategy the division of helium from natural gas is low temperature liquefaction
Which of the following substances has the highest melting point?
a. pentane b. nonane c. ethane d. butane
Nonane (b) has the highest melting point.
-----------------------------
A caveat: I'm assuming that we're dealing with the straight-chain isomers of these alkanes (specifically pentane and nonane). The straight-chain isomer of pentane (n-pentane, CH3-[CH2]3-CH3) has a melting point of -129.8 °C; the straight-chain isomer of nonane (n-nonane, CH3-[CH2]7-CH3) has a melting point of -53.5 °C. The pattern holds as you go down (or up): The more carbon atoms, the higher the melting point. So, in decreasing order of melting points here, you'd have the following: nonane > pentane > butane > ethane.
However, one structural isomer of pentane, neopentane, has a melting point of -16.4 °C, which is higher that the melting point of n-nonane despite neopentane having the same molecular formula as its straight-chain isomer. Of course, you're not to blame for coming up with this question; this is just some extra info to keep in mind.
A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2°C.
How much energy is required to raise the temperature of the water to 28.6°C?
Energy required : 4.23 x 10⁹ J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Volume of water:[tex]\tt V=L\times W\times H\\\\V=10\times 4\times 3=120~m^3[/tex]
mass of water :ρ = 1000 kg/m³
[tex]\tt mass=\rho\times V\\\\mass=1000~kg/m^3\times 120~m^3=120,000~kg[/tex]
Heat requiredc water = 4200 J/ kg ° C
[tex]\tt Q=m.c.\Delta T\\\\Q=1.2\times 10^5\times 4200\times (28.6-20.2)\\\\Q=42336\times 10^5=4.23\times 10^9~J[/tex]
How does the goal of science compare to the goal of
engineering?
Answer:
The goal of science is compared to engineering because engineering is there to solve problems while science is to explain natural phenomena
Explanation:
3. What is SI system? Why has SI system been developed? Give reasons
How many mL are in 7.3 dL?
Answer:
730 mL which is .73 L
Explanation:
What are the main characteristics for the definition of work?
Answer:
1-There Must be some displacement in the direction of force. 2-Angle between force and displacement is 0°.
HELP ME ASAP PLEASE BIG POINTs
Answer:
1.cation
2.anion
Explanation:
the plus is always cation and the negative is anion
Answer:
1. cation
2. anion
Explanation:
A positive ion is always cation and the negative ion is anion
Definition of periodic trends
Identify the number of significant figures in the following number: 0.0008
Nitrogen-7 configuration
Explanation:
Electronic configuration of Nitrogen -
₇N = 1s² 2s² 2p³
the number of atoms in 2.0 moles of B is
Answer:
The answer is
1.204 × 10²⁴ atoms of BExplanation:
To find the number of entities of a substance given it's number of moles we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.0 moles
We have
N = 2 × 6.02 × 10²³
We have the final answer as
1.204 × 10²⁴ atoms of BHope this helps you
Number of moles of boron (B) = 2
To Find :We have to find number of atoms present in the given amount of boron[tex].[/tex]
Solution :➤ We know that 1 mole of substance contains 6.022×10²³ particles (atoms/molecules).
Avogadro's no. = 6.022 × 10²³★ Number of atoms present in B :
⭆ N = n × [tex]\sf{N_A}[/tex]
N denotes number of atomsn denotes mole number[tex]\sf{N_A}[/tex] denotes avogadro's number⭆ N = 2 × 6.022 × 10²³
⭆ N = 12.044 × 10²³
⭆ N = 1.2 × 10²⁴
Hope It Helps!name the elements that determine the weather of a place....
Use the information below to explain why the atomic radius decreases across a period.
Answer:
Detail is given below.
Explanation:
Atomic radius trend along period:
As we move from left to right across the periodic table the number of valance electrons increases. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
we can see in picture A there is one positive charge and force of attraction is 2.30×10⁻⁸ N
In picture D there are 2 positive charge and force of attraction is 4.60×10⁻⁸ N
So by increasing the positive charge force of attraction also increases.
In F we can see there is more positive charge thus force of attraction is also greater.
(Plz help ASAP) List at least three different sources used for naming organisms
Answer:
kingdom, phylum, class, order, family, genus and species.
Explanation:
Periodic trends
PLEASE HELP ME OUTT!! I WILL GIVE BRAINLIEST!
Answer:
A. Ba
C. Cu
D. H
Explanation:
HOPE THIS HELPS
How is the Separation of a Compound different
from that of a mixture?
what is the mass number? plz help!
Answer:
I believe it is 2?
Explanation:
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Helpppp, this is due at 12:00 am !!!!
Answer:
The individual substances in a mixture can be separated using different methods, depending on the type of mixture. These methods include filtration, evaporation, distillation and chromatography.
Explanation:
what is meant by the Terrestrial and Hydrologic parts of Earth?
Not sure what you exactly mean, but I think what you are talking about are the spheres of earth (Lithosphere, Hydrosphere, Atmosphere, and Biosphere.)
Lithosphere (Terrestrial) is the land on earth. Hydrosphere (Hydrologic) is the water on earth.
I'm not sure if this is 100% correct but I'm guessing this is what you are referring to. It could be different across different science classes.
HELP PLEASE! There is a water-filled continental rift in Iceland. What type of plate boundary would cause this rift? *
A. convergent
B. divergent
C. transform
Lithospheric plates move because of the movement of the ___________________________ under them.
A. lower mantle
B. asthenosphere
C. outer core
D. inner core
Answer:
B. Divergent
The rift formed in the Divegent tectonic boundary between the North America and Eurasian Plates and is located now in Iceland (Im sorry im not good at explaining)
When you put water into a hot metal pan of equal mass, why does the pan cool down more than the water heats up ?
Answer:
The specific heat of water is greater than that of the metal
Explanation:
When water is put into a hot metal pan of equal mass, we discover that the pan cools down more than the water heats up because heat is rapidly transferred from the pan to the water.
This happens because the specific heat capacity of water is much greater than that of the pan hence heat is more quickly transferred from the pan to the water.
they are located between each of the atrium and ventricle to prevent blood from flowing backwards, what is it?
the final step of the scientific method is to ____ the results
Answer:
The final step of the scientific method is to communicate the results
Mrs. K is trying to rearrange her living room. She uses 150 N of force to move a 600 g table. The table does not move. How much work is done?
90,000 J
4 J
600 J
0 J
Answer:
0J
Explanation:
Work = Force * Distance
Since the distance (or the displacement) in this problem is 0, hence, no work is done. W = 150*0 = 0. The mass of the object is just trying to trick you. Hopes this helps!
the order of particle in all substance is the same
A True
B false
Answer:
false false false false
Which term names the longest geologic time frame?
Answer:
Precambrian
Explanation:
Answer:
An Eon
Explanation:
epcohs are the shortest geologic time frame, which make up periods, that make up eras, that make up eons.
WILL MARK BRAINLIEST!!!! HELPPPP
what is the difference between simple distillation and fractional distillation
Answer:
Fractional distillation is essentially the same as simple distillationexcept that a fractionating column is placed between the boiling flask and the condenser. The fractionating column is usually filled with glass or plastic beads. These beads improve the separation between the liquids being distilled.
Explanation:
Answer:
Explanation:
The difference between simple and fractional distillation is the number of times that the liquid is vaporized and condensed. Simple distillation condenses the liquid once, so the boiling points of the two liquids must be far apart to make it efficient. The number of simple distillations in a fractional distillation apparatus depend on the length and efficiency of the fractionating column. The process is the same; the difference is mainly one of iteration.
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