Answer:
Positive
Explanation:
For the most effective hot pack, the temperature change should be positive.
Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.
This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.
Fluorine has 7 valence electrons. How many more electrons does it need to acheive a full outermost energy level
a
1
3
Ob
Oc
O d
10
2
which number indicates the energy level of an atoms valence electrons
What is created when rocks bend due to the compression of tectonic plates?
Faulting
Subduction
Folding
Whipping
Answer:
folding
Explanation: google told me
Answer: Folding
Explanation:
I took the quiz and i used my notes
How many neutrons does an atom of
Copper have in its nucleus?
In the reaction below, how would adding more of reactant A affect the equilibrium of the system? (2 points)
A + B ⇄ C + D
a
Shift it to the right toward the products.
b
Shift it to the left toward the reactants.
c
Equally create more products and reactants.
d
It would have no effect.
Answer:
a . Shift it to the right toward the products.
Explanation:
In the reaction, if more of the reactant A is added to the system, the reaction will shift towards the products.
If a system at equilibrium is disturbed by changing the concentration of one of the substances, all the concentration will change until a new equilibrium point is reached. If we add more reactants, the concentration is increased and the reaction shifts to the right so as to maintain the constancy of the equilibrium constant.Answer: a . Shift it to the right toward the products.
Explanation:
A brick is resting on a smooth, level surface. A student applies a force of
5 N to the brick in order to move it to the right. The magnitude of the
force of fiction on the brick is also 5 N. Which statement best describes
the efect of these two forces on the brick
A the net force in the brick is 10 N toward the right, and the brick begins to move.
B the net force on the brick is 0 N, and the brick begins to move.
C the net force on the brick is 0 N, and the brick remains at rest.
D the net force on the brick is 10 N toward the right, and the brick remains at rest.
Global Positioning System signals can tell you
Answer:
GPS use satellites and receivers to determine location. GPS can be used to find exact location, and relative location, so how far away you are from somewhere else. It can also give coordinates and directions.
Calculate the energy of the lasers in a Blu-ray player, which emit at a wavelength of 4.05x10−7 m.
Answer:
4.907 × 10^-19 J
Explanation:
The energy of the lasers in a Blu-ray player can be calculated by using;
E = hf
Where;
E = Energy of laser (J)
h = Planck's constant (6.626 × 10^-34 J/s)
f = frequency (Hz)
However, the frequency must be known first in order to calculate the energy. The frequency can be calculated using the formula:
f = v/λ
Where:
λ = wavelength (4.05x10−7 m.)
v = speed of light (3 × 10^8m/s)
f = frequency (Hz)
f = 3 × 10^8 ÷ 4.05 x 10^−7
f = 0.7407 × 10^(8 + 7)
f = 0.7407 × 10^15
f = 7.407 × 10^14 Hz
Using E = hf
E = 6.626 × 10^-34 × 7.407 × 10^14
E = 49.07 × 10^(-34 + 14)
E = 49.07 × 10^-20
E = 4.907 × 10^-19 J
HELP PLEASE THIS IS CONFUSING
Number of moles = 8.3 x 10⁻¹³
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
5 x 10¹¹ atoms of Silver :
[tex]\tt mol=\dfrac{5\times 10^{11}}{6.02\times 10^{23}}=8.3\times 10^{-13}[/tex]
How would frictional force be affected in space?
Answer:
when two surfaces rub together in outer space, there will be friction. Friction is a surface effect and doesn't depend upon there being air. There is also a force like air resistance from the very sparse gas in space, but it will be very, very small, since space is a very good vacuum.
Explanation:
For visible light, explain how wavelength and energy vary for the different colors. Provide the trends in wavelength for the spectrum of light (purple to blue to green to yellow to orange to red). How is this different for energy?
Answer:
See explanation
Explanation:
If you look closely at the image attached, you will discover that the order of increasing wavelength in the visible spectrum is;
violet < indigo< blue < green < yellow < orange < red
On the order hand, the energy of the photons increases in the order;
Red < orange < yellow < green < blue < indigo < violet
Since energy follows a trend opposite to that of wavelength, we can see that the greater the wavelength of light, the lower the energy of photon corresponding to that particular colour.
The diagram shows a certain kind of cell with all of its major parts labeled.
Which statement is supported by the diagram?
The cell must be eukaryotic because it has a cell membrane and a cell wall.
The cell must be prokaryotic because it has a cell membrane and a cell wall.
The cell is eukaryotic because it does not have any membrane-bound organelles.
The cell is prokaryotic because it does not have any membrane-bound organelles.
Answer:
I think it's the last one
D. The cell is prokaryotic because it does not have any membrane-bound organelles.
Explanation:
The difference between eukaryotic and prokaryotic cells are that the eukaryotic cells have a nucleus and they have membrane-bound organelles, and prokaryotic cells don't.
Hope this Helps!
Why is the supply of oil in Texas decreased from its supply fifty years ago? A. Oil is a nonrenewable resource B. Oil is a renewable resource C. Oil takes sixty years to replenish itself. D. Oil wells are no longer being dug.
Answer:
A
Explanation:
The supply of oil in Texas decreased from its supply fifty years ago because oil is a nonrenewable resource.
A nonrenewable resource is one that cannot be replenished naturally at the same pace as its usage and hence, decreases and eventually gets exhausted with usage or exploitation over time. This is unlike renewable energy resource that gets replenished even with usage.
The more the oil in Texas is exploited, the more its supply or reserve will decrease. This is why the supply of oil has decreased from what it is fifty years ago.
The correct option is A.
ik i already asked this but i need diff point of views
I need advice...
ive been skipping out on having my vitamins and pills for awhile without telling my parents. i just dont like taking pills and vitamins so my habit is to throw them away. I read that this can really hurt you and idk what to do. Will taking them again save me?
Answer:
Is it prescribe to you?If so than yes if not then no need to
Explanation:
Plz help bc this s due at exactly 3:30pm
Answer:
Is it talking about the differences about them or the ways they are the same
Explanation:
In the reaction A+B → C + D, what are the reactants?
O A. A and B
O B. A and C
C. Just B
O D. C and D
Answer:
A. A and B
Explanation:
The reactants in this reaction is A and B;
Reaction:
A + B → C + D
In a chemical reaction, the left hand side is made up of the reactants.
On the right hand side, we have the products
For the example given;
A and B are the reactants
C and D are the products
3.00 Liters of gas are stored at standard temperature and pressure. If the volume of the gas is increased to 4.00 L at a constant temperature what is the new pressure of the gas
The new pressure of the gas : 0.75 atm
Further explanationBoyle's Law
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
P₁=1 atm ⇒ standart temperature and pressure (STP)
V₁=3 L
V₂=4 L
[tex]\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_2=\dfrac{1\times 3}{4}\\\\P_2=0.75~atm[/tex]
Which wave has the higher frequency?
A. Bottom
B. Top
Marcy creates a model that compares elements and compounds. Her model is shown.
Which statement can Marcy support with her model?
An element is highly reactive, and a compound is stable.
An element can exist in any state, and a compound can only be liquid.
An element contains multiple substances, and a compound contains only one pure substance.
An element is made of a single type of atom, and a compound is made of two or more atom types.
Answer:
Explanation:
the asnwer is acceleratiin
example of neutral outcome ?
Answer:
drops a glass cup of water outcome mad parents
Explanation:
Mad pagents mean death no surviva.
How many mg is 76.0 kg? Express your answer in scientific notation. Use the ^ symbol before the exponent, eg 1x10^3
Milligram and kilograms are two common units of mass. one milligram is 10⁻⁶ kg. Hence, 76 Kg is 76 × 10⁶ mg.
What is mass?Mass of a substance is the measure of its total amount. The standard unit of mass is grams (g). Mass is an extensive property which is dependant on the amount of particles in it.
There are several units of expressing mass, like gram, milligram (mg), kilogram (kg), nanogram (ng), etc. They can be interchanged between each other by certain relations.
Milligram unit is generally used to express the doses of drugs and small quantities.
One milligram = 10⁻⁶ kilograms.
Hence, 1 kg = 10⁶ mg
Therefore, 76 Kg is 76 × 10⁶ mg.
To find more on mass units, refer here:
https://brainly.com/question/14953134
#SPJ2
Chemical equations need to be _________
Long
Periodic
Balanced
Advanced
Answer:
advanced
Explanation:
Answer:
Balanced
Explanation:
..............
What % of the earth's freshwater is found in glaciers and ice packs? 0.03% 0.03% 3% 3% 24.9% 24.9% 75%
Answer:
En verdad solo el 0,025% del agua de la tierra es dulce
Explanation:
How many electrons does a gallium atom give up when it becomes an ion?
Answer:
3 electrons
Explanation:
Is a CAS number a physical or chemical property
Explain why naturally occurring minerals in rocks often have a visible crystalline structure.
PLZ HELP FAST BRANILIST IF RIGHT
Wegener found the fossilized remains of a reptile and a plant on different continents which are now separated by thousands of miles of ocean. The reptiles and plants could not have possibly crossed the oceans. What kind of evidence is this an example of? *
A climate
B puzzle
C fossil
Answer:
Climate?
Explanation:
A German scientist who proposed the theory of continental drift ... Land reptile fossil located on multiple continents; evidence of continental drift ... climate evidence. Tropical plant fossils found on an island in Arctic Ocean, and glacier deposits ... Lystrosaurus (fresh water reptiles) found in places now separated by oceans
I NEED THIS ASAP!!
How many moles of chlorine gas are contained in 9.02 x 1023 molecules?
Most rocks are made of what elements?
oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium
quartz, granite, marble, limestone, shale, sandstone, obsidian, mica
carbon, hydrogen, rubidium, nickel, zink, copper, lead, gallium
lithium, nitrogen, selenium, fluorine, chlorine, antimony, gallium, tin
Answer:
A. oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium
Explanation:
Please Help 30 Points + Brainlest Look At The Image Below And Answer The Flowing Question
Answer:
Between A and D
Explanation:
