Answer:
D
Explanation:
The temperature increases
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C- main sequnce
Regulus A is a binary star consisting of a blue-white main sequence star of spectral type B7V, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. The two stars take approximately 40 days to complete an orbit around their common centre of mass.
Maria determines that the wavelength of a sound wave is 2.50 meters and that the wave is traveling at 340 m/s.
What is the frequency of the sound wave?
Hz
Answer:
Frequency= [tex]\frac{speed of wave}{wavelength} =\frac{340}{2.5} =136Hz[/tex]
Explanation:
Hope this helps.
Question 1
A chemical reaction in which calcium carbonate, CaCO3, is decomposed results in the productions of two simpler compounds.
+
Caco,
79
Cao
28.00 g
CO
21.97 g
What is the mass of calcium carbonate, to the nearest hundredths of a gram, is decomposed in this reaction?
Answer:
C
Explanation:
Cuz trust me it’s c
What is different between an ionic bond and a covalent bond?
A An ionic bond is a bond between charged atoms, while a covalent bond is a bond between opposite charges.
B An covalent bond is a bond between charged atoms, while an ionic bond is a bond between neutral atoms.
C An ionic bond is a bond between charged atoms, while a covalent bond is a bond between neutral atoms.
D An ionic bond shares electrons, while a covalent bond is an attraction between opposite charges.
Answer:
Explanation:
Ionic bonds result from transfer of electrons, whereas covalent bonds are formed by sharing. 2. Ionic bonds are electrostatic in nature, resulting from that attraction of positive and negative ions that result from the electron transfer process; charge separation between covalently bonded atoms is less extreme.
20. A substance with a high volatility A. has a high boiling point. B. tends to stay in the liquid or solid phase. C. readily evaporates. D. can never be a liquid.
According to this question, a substance with a high volatility readily evaporates.
What is volatility?Volatility is the characteristics of a material which describes how readily the material undergo vaporization.
Volatile substances readily change phase from solid or liquid to gases via the process of vaporization.
Therefore, according to this question, a substance with a high volatility readily evaporates.
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Na3(Po4)+CaCl2→Ca3(Po4)2+NaCl
Pls explain how did you balanced this equation.
Need help asap
Answer:
3 CaCl2 + 2 Na3Po4 yields Ca3(Po4)2 + 6 NaCl
Explanation:
Answer:
Explanation:
Na3(Po4)+CaCl2→Ca3(Po4)2+NaCl
Start on the left side with the reactants.
There are 3 Na in Na3(Po4) so there must be 3 Na on the right in products.
That means 3 NaCl which has 3 Cl.
But there are only 2 Cl in CaCl2 on the left.
6 is a common multiplier of 2 and 3 so multiply CaCl2 by 3 and Na3(Po4) by 2 to get the balanced equation:
2 Na3(Po4) + 3 CaCl2 → Ca3(Po4)2 + 6 NaCl
Which molecular geometry is least likely to occur with sp3 hybridization?
tetrahedral
trigonal planar
bent
trigonal pyramidal
Answer:
Trigonal pyramid
Explanation:
please help wit this , thank you !
Which distinguishes chemical changes from physical changes?
A Physical changes are permanent, while chemical changes are temporary.
B) Chemical changes produce new substances, while physical changes do
not.
C Physical changes alter the properties of the substance, while chemical changes maintain the same properties.
D Chemical changes result in a change in mass, while physical changes do not.
Answer:
B.) Chemical changes produce new substances, while physical changes do
not.
This is a chemical change as the products have very different property as compared to reactant not only physically but also chemically. Therefore, the correct option is option B.
What is chemical change?Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.
Cooking is a chemical change not a physical change. During cooking the reaction that is associated is combustion reaction as the by product is carbon dioxide and water. Chemical changes produce new substances, while physical changes do not.
Therefore, the correct option is option B.
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If 9000. J of heat are absorbed by 800. g of water at 25.0oC, what will be its final temperature?
Answer:
22 626 000 J. = 22 626 kJ. 4. If 9000 J of heat are absorbed by 800 g of water at 5.0 o. C, what maximum temperature will the water attain? Q = mc ∆T.
Explanation:
The final temperature can be calculated using the calorimetric equation. Here, the final temperature of water is 27.71 °C.
What is calorimetric equation ?The calorimetric equation connecting the heat energy absorbed or released q by a system with the mass m, temperature difference ΔT and the specific heat capacity c as follows:
q = m c ΔT
The specific heat capacity of water = 4.15 J/ °C g.
given that heat energy absorbed q = 9000 J
mass = 800 g
initial temperature = 25 °C.
Then,
9000 J = 4.15 J/ °C g. × 800 g (25 °C + T)
then T = [ 9000 J/ 4.15 J/ °C g. × 800 g ] + 25 °C = 27.71 °C.
Therefore, the final temperature of water is 27.71 °C.
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4. Question in attached image.
Answer: 5.1 x 10^-3 < 0.0057 < 4.9 x 10^-2 < 0.0072 x 10^2 < 5.3 x 10^4 < 57 x 10^3
Because:- 5.3 x 10^4 = 53000
57 x 10^3 = 57000
4.9 x 10^-2 = 0.049
0.0057 = 0.0057
5.1 x 10^-3 = 0.0051
0.0072 x 10^2 = 0.72
___________________________
Hope it helped u,
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Explain Why a change in the state of matter is a physical change
Answer:
Cuz they are reversible changes that do not change matter's chemical makeup or chemical properties. Processes involved in changes of state include melting, freezing, sublimation, deposition, condensation, and evaporation.
Explanation:
The greater a habitat's biodiversity, the greater will be the habitat's, sustainability over time with varying conditions sustainability over time with varying conditions consumption of energy in the form of sunlight consumption of energy in the form of sunlight temperature ranges across the seasons temperature ranges across the seasons distance to the nearest water source distance to the nearest water source
Answer:
The correct answer is: sustainability over time with varying conditions.
Explanation:
A habitat can be defined as the physical and geographical conditions that will positively influence the development of life, in any form.
Therefore, it is correct to say that sustainability over time with favorable conditions will favor the greatness of the habitat.
Sustainability is the ability to preserve a system for the maintenance of future life, so it is ideal for there to be sustainable development across society, so that natural resources are preserved so that biodiversity continues to exist.
What is meant by”the ozone hole”?
Answer:
The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.
Which sentence best describes Earth's revolution around the sun?
options : Tanya should slowly spin the tennis ball once around an imaginary axis.
Tanya should slowly spin the tennis ball five times around an imaginary axis.
Tanya should slowly walk around Becca five times.
Tanya should slowly walk around Becca once.
Answer:
B
Explanation:
Tanya should slowly spin the tennis ball five times around an imaginary axis.
The earth revolves around the sun 1 time per year.
BUT
the earth rotates on its' axis, causing seasons, Summer, winter, autumn, spring
Answer:
In one year Earth makes one revolution around the Sun.
Explanation:
In one day Earth makes one rotation on its axis. Earth also travels on an elliptical orbit around the Sun. And it takes one year to make a complete trip.
Vocabulary-what is a fossil
PLSSS HELP Which reaction is endothermic? *
2 points
HCl + NaOH → NaCl + H₂O + 58 kJ
2Na + Cl₂ → 2NaCl + energy
6CO₂ + 12H₂O + energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
The last one is endothermic, as you can notice we are using up energy (absorbing energy) in order for the reaction to occur.
Whereas the other ones release energy, as they are considered exothermic.
Write the correct word equation for the following:
H2 (g) + NO (g) àH2O (l) + N2 (g)
Answer:" For example, when hydrogen gas, H2(g), is burned in the presence of gaseous oxygen, O2(g), a new substance, liquid water, H2O(l ), forms. The covalent bonds within the H2 molecules and O2 molecules break, and new covalent bonds form between oxygen atoms and hydrogen atoms (Figure 7.1)."
Explanation:
What are the expanded electron configurations for Ca, B, C, Si?
Answer:
[Ar] 4s²
Explanation:
What causes water to change from a vapor to a liquid, or a liquid to a solid?.
Answer:
The lack of heat
Explanation:
when vapor gets cold enough, it reverts back to a liquid, when liquid gets cold enough, it freezes into a solid.
how much energy is required to raise the temperature of 3kg aluminum from 18 Celsius to 23 celsius ?
Answer:
13350 Joules
Explanation:
[tex]q=m*c*(Change in T)[/tex]
m=mass in grams = 3000
c=specific heat capacity = 0.89 J/(g*C)
Change in T= 23-18 = 5 C
Answer:
I think the answer is 13,455 J
Find the density of evaporated milk if 411 grams occupy 384 cm^3
Answer:
The answer is 1.07 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 411 g
volume = 384 cm³
We have
[tex]density = \frac{411}{384} \\ = 1.0703125[/tex]
We have the final answer as
1.07 g/cm³Hope this helps you
The Layers of the Earth video compared the layers of the earth with what type of food?
Question 5 options:
Avocado
Coconut
Hard Boiled Egg
Malted Milk Ball
Coconut is the type of food in which the layers of the Earth is compared with.
What is Earth?This is referred as the third planet from the Sun and is irregularly shaped ellipsoid and has the most life forms present.
The ellipsoid shape of the Earth is the same as that of a Coconut which was why option B was chosen as the most appropriate choice.
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The Theory of Continental Drift says that the continents were once joined together and are drifting apart. Who is given credit for coming up with this theory? Question 5 options: Charles Darwin Alfred Wegener Marie Curie Alfred Wallace.
The Theory of Continental Drift says that the continents were once joined together and are drifting apart, Alfred Wegener is given credit for coming up with this theory.
What is continental drift?Continental drift is a kind of illusion in which it looks like that continents changes their places over the surface of the earth. The Theory of Continental Drift was given by Alfred Wegener, it is a hypothesis and according to this theory the continents will move with respect to the geological time relative to each other. And due to their movement on the non planar or dynamic geographical base it looks like a drift.
Hence, option (2) is correct i.e. Alfred Wegener gave this theory.
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Answer:
a
Explanation:
What is dimensional formula of specific heat
capacity with process
.
Answer:
The heat capacity of an object is an amount of energy divided by a temperature change, which has the dimension L2·M·T−2·Θ−1. Therefore, the SI unit J/K is equivalent to kilogram meter squared per second squared per kelvin (kg m2 s−2 K−1 ).
Explanation:
BARINLY PLS HELP ME ASP !!! it’s science I need help fast pls
What volume will 8.47kg of sulfur dioxide gas occupy at a pressure of 89.4kPa and a temperature of 40.0°C?
Answer:
[tex]V=3850.1769\;L[/tex]
Explanation:
Gas law is the mathematical relationship among pressure,volume, temperature, and the number of moles of a gas. It is the equation of state for an ideal gas. Which is because the state of a gas can be known by it pressure, volume, temperature, and number of moles.
Look below which "R" is a constant
[tex]PV=nRT[/tex]
[tex]n=8.47kg\times(\frac{1000g}{1kg})\times(\frac{1mol}{64.066g})[/tex]
[tex]n=132.2074\;mol[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{(132.2074\\;mol\times(8.314\frac{L\cdotkPa}{mol\cdotk)}\times(40+273.15)k}{89.4\;kPa}[/tex]
or (3.85 x 10^3 L)
[tex]V=3850.1769\;L[/tex]
~Lenvy~
What is the wavelength of a 264-Hz sound wave when the speed of sound is 345 m2 1.31 m A. 0.77 m C. 6.09 m D. 0.11 m
The wavelength : 1.31 m
Further explanationWaves are vibrations that travel
There are several parts of the wave namely:
frequency, period, wavelength and wave velocity
Frequency (f): the number of waves that occur in one second
Period (T): The time required to travel one wave
Wavelength (λ): the distance from one crest to another, or from one trough to another (on transverse waves) and the distance between two consecutive compressions or between two consecutive rarefactions (on longitudinal waves)
Fast wave propagation (v): the distance traveled by waves per unit of time
The formula:
[tex]\tt v=\lambda\times f[/tex]
The speed of a sound wave 345 m, and the frequency = 264 Hz , so
v = 345 m
f = 264 Hz,
then the wavelength :
[tex]\tt \lambda=\dfrac{v}{f}=\dfrac{345}{264}=\boxed{\bold{1.31~m}}[/tex]
The laboratory equipment below is called
Answer:
The laboratory equipment is called beaker
Can someone please help?
Name this IUPAC name:
Answer:
ch and aporda e too
Explanation:
hope its help