Answer:
c. 300 cal
Explanation:
To calculate the heat, we use the following equation:
heat = m x Cp x ΔT
Where m is the mass of water, Cp is the specific heat of water (which is 1 cal/g.°C) and ΔT is the change in temperature (calculated as the difference between the final T and the initial T).
We have the volume of water (10 ml) but not the mass. As the density of water is 1 g/ml, the mass of water is:
density = mass/volume ⇒ mass = density x volume = 1 g/ml x 10 ml = 10 g
The change in temperature (ΔT) is:
ΔT= Final T - Initial T = 25°C - (-5°C) = 30°C
Finally, we introduce the data to calculate the heat:
heat = 10 g x 1 cal/g.°C x 30°C = 300 cal
Therefore, the correct option is c. 300 cal
What is the wavelength of a 229 Hz sound wave moving at a speed of 345 m/s?
Answer:
wave length=speed/frequency
=345/229
A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?
Answer:
Fewer bubbles will be produced because of fewer collisions of reactant molecules
Explanation:
As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules
What temperature change in °C is produced when 4430 Joules are absorbed by 237 grams of water?
Answer:
4.46 °C
Explanation:
Step 1: Given and required data
Energy absorbed (Q): 4430 JMass of water (m): 237 gSpecific heat of water (c): 4.186 J/g.°CStep 2: Calculate the temperature change
We will use the following expression.
Q = c × m × ΔT
ΔT = Q / c × m
ΔT = 4430 J / (4.186 J/g.°C) × 237 g
ΔT = 4.46 °C
The temperature change is 4.46 °C.
Which wave can travel in both empty space and matter?
(10 Points)
A. radio
B. seismic
C. sound
D. water
Seismic waves can move through both empty space and matter. Electromagnetic waves differ from sound waves in this regard because they do not require molecules to move.
What are earthquake waves?Seismic waves are waves that pass through or over the Earth. They can also be caused by explosions, volcanoes, landslides, and earthquakes, which are movements of the Earth's tectonic plates. They can reveal a lot about the Earth's composition. Earthquakes are caused by sudden movement along Earth's fault lines. Seismic waves, which cause damage by traveling through the Earth, are created when movement releases energy from the "elastic strain" that has been stored.This means that electromagnetic waves can travel through solid materials like air as well as across space. Astronauts use radios in this manner to communicate while on spacewalks. Radio waves are an example of an electromagnetic wave.To learn more about earthquake waves refer to:
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Definition: This is two or more elements chemically combined in a fixed ratio.
Answer:
Compound
Explanation:
Compounds – Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.
Example of compounds includes water (H2O), Hydrogen Peroxide (H2O2), etc. You could see water’s chemical formula, it says it has 2 atoms of Hydrogen combined with 1 atom of oxygen and in hydrogen peroxide, it has 2 atoms of hydrogen and two atoms of oxygen.
Plasma is rare on Earth but plentiful in the universe.
A True
B False
Answer:
I think it is a
Explanation:
Plasma is the fourth fundamental state of matter after solid, liquid and gas. At this stage of matter it exists in the form of a gas of ions and free electrons and is highly electrically conductive. Although plasma is abundant in the universe, natural occurrences are relatively rare here on Earth.
All of the orbitals in a given subshell have the same value of the __________ quantum number
Answer:
magnetic spin
Explanation:
the magnetic spin quantum number i.e + 1/2 or-1/2 ...those are all the orbitals in agiven shell simolarly contains it
Answer:
principal
Explanation:
The quantum numbers that are used in the identification of an electron are n, l, m, and s.
n= principle quantum number
l= azimuthal quantum number
m= magnetic quantum number
s= spin quantum number
All the orbitals in a given subshell have the same value of n(principle quantum number) and l( azimuthal quantum number).
How many moles of carbon are in 7.00 x 1023 atoms of carbon?
Answer:
1.16 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where 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 we have
[tex]n = \frac{7 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7}{6.02} \\ = 1.162790....[/tex]
We have the final answer as
1.16 molesHope this helps you
Evapotranspiration is the process by which
O plants give off water vapor as a waste product as they process energy.
O evaporated water moves through the air and causes differences in climate.
O None of the above.
O rock is shaped as water evaporates off of its surface.
Answer:
A: plants give off water vapor as a waste product as they process energy
Explanation:
Evapotranspiration in plants is defined as the process whereby water is evaporated from its leaves through transpiration during the process of photosynthesis. Different factors like wind, humidity, temperature and availability of water could make it vary.
Comparing all the options, to this definition, the correct answer is Option A.
PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!
You measure the mass of an apple using a balance. You get these three measurements:
Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g
You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer.
Answer:
100 POINTS! (50 split up) PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!
You measure the mass of an apple using a balance. You get these three measurements:
Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g
You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer in a paragraph for the best grade.
Explanation:
Which of the following most affects the function of a molecule?
O A. Mass
O B. Solubility
O C. Color
O D. Structure
Answer:
Structure
Explained:
Answer:
d
Explanation:
a p e x :)
How many chromium atoms are in 3.56 x 10^-21 moles of potassium chromate?
Answer:
21.44× 10² atoms
Explanation:
Number of chromium atoms = ?
Moles of potassium chromate = 3.56 × 10⁻²¹ mol
Solution:
1 mole of K₂CrO₄ contain 1 mole of Cr.
3.56 × 10⁻²¹ moles of K₂CrO₄ contain 3.56 × 10⁻²¹ moles of Cr.
Number of atoms of Cr:
1 mole contain 6.022× 10²³ atoms
3.56 × 10⁻²¹ mole × 6.022× 10²³ atoms / 1mol
21.44× 10² atoms or 2144 atoms
What is the mass, in kg, of a 2.12-g piece of lead
Answer:
0.00212 kgs
Explanation:
one gram is equal to 0.001 kilograms
Find the wavelength of the electromagnetic radiation with a frequency of 3x10^-18Hz PLEASE ANSWER
Answer:
λ = 1×10²⁶m
Explanation:
Given data:
Wavelength of radiation = ?
Frequency of radiation = 3×10⁻¹⁸Hz
Solution:
Formula:
c = f × λ
c = speed of wave = 3×10⁸ m/s
by putting values,
3×10⁸ m/s = 3×10⁻¹⁸Hz × λ
λ = 3×10⁸ m/s / 3×10⁻¹⁸s⁻¹
λ = 1×10²⁶m
What happens when there is a cluster of sunspots?
Answer:
a cluster of sunspots will results in extreme solar flares that can cause mass disruption of electronics on earth.
5. What is the wavelength of a radio station emitting its signal at 95.5 MHz? Estimate your
answer to the nearest power of ten.
Answer:
[tex]\lambda=314\times 10^{-2}\ m[/tex]
Explanation:
Given that,
Frequency, f = 95.5 MHz
We need to find the wavelength of a radio station emitting its signal.
The relation between the frequency and the wavelength is given by :
[tex]c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{95.5\times 10^6}\\\\=3.14\ m[/tex]
or
[tex]\lambda=314\times 10^{-2}\ m[/tex]
So, the wavelength of a radio station is [tex]314\times 10^{-2}\ m[/tex].
Give 5 examples of limiting factors
Answer:biotic, like food, mates, and competition with other organisms for resources.
Explanation:
Consider the production of sulfur trioxide from sulfur dioxide and oxygen gas:How many grams of sulfur dioxide reacted if 163 kilojoules of heat were evolved in an experiment
Answer:
102.4 g
Explanation:
The equation of the reaction is;
2SO2(g) + O2(g) -----> 2SO3(g) --------ΔH = -198 KJ/mol
Now, given that;
If 2 moles of SO2 evolves 198 KJ/mol of heat
x moles of SO2 evolves 163 KJ/mol of heat
x = 2 * 163/198
x = 1.6 moles of SO2
molar mass of SO2 = 64 g/mol
mass of SO2 = 1.6 moles * 64 g/mol = 102.4 g
PLEASE! need help now please!
Answer:
• The closing of the frontier
Explanation:
• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier
Please help I will mark brainliest
Explanation:
light blue is the answer second one
Calculate the H3O+ concentration and then pH in a 0.100 M HC2H3O2 solution that is
1.34% loniped?
HC2H3O2(aq) + H2O(l) > H30(aq) + C2H302- (aq)
Answer:
Please check with the attachment posted.
Please do confirm the answer.
6) Mendeleev put the elements on the periodic table in the order of how
many
it has. *
O electrons
O neutrons
O protons
Answer: Protons
Explanation:
what is this element
Answer:
Oxygen
Explanation:
From the question given above, the following data were obtained:
Number of electrons = 8
Number of protons = 8
Number of Neutrons = 8
Name of element =?
Next, we shall determine the atomic number of the element. This can be obtained as follow:
The atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically, it is expressed as:
Atomic number = proton number
From the question given above,
Number of protons = 8
Therefore,
Atomic number = 8
Comparing the atomic number of the element (i.e 8) with those in the periodic table, we can conclude that the element is oxygen since no two elements have the same atomic number.
question: convert 22.63 miles of oxygen to volume
very urgent
Answer:
506.912 L
Explanation:
From the question given above, the following data were obtained:
Number of mole of O₂ = 22.63 moles
Volume of O₂ =?
Recall:
1 mole of a gas occupy 22.4 L at STP.
With the above information, we obtained the volume occupied by 22.63 moles of O₂ as follow:
1 mole of O₂ occupied 22.4 L at STP.
Therefore, 22.63 moles of O₂ will occupy = 22.63 × 22.4 = 506.912 L at STP.
Thus, 22.63 moles of O₂ is equivalent to 506.912 L.
Which metal can be extracted from bauxite ore?
Answer:
Aluminum can be extracted from bauxite ore.
An avocado has a mass of 215 g and a density of 0.86
g/mL. What is the volume of the avocado?
The volume of avocado here is 250 ml as per the given data i.e., mass of 215 g and a density of 0.86 g/mL.
What is density?The density of an artifact is delineated as its mass divided by the volume. Density is commonly expressed in grams per cubic centimeter.
The grams are a unit of mass and indeed cubic centimeters are a unit of volume. A box with more particles will be denser than a box with fewer particles.
The density of a solid, liquid, or gas illustrates how closely packed the particles can be. The amount of mass per unit volume is defined as density.
Density is defined as d = M/V, where d is density, M is mass, and V is volume. Density is commonly measured in grams per cubic centimetre.
We know that,
Density = mass/volume.
Volume = mass/density.
Here, it is given that
Density = 0.86 g/mL.
Mass = 215 g.
Volume = 215/0.86 mL.
Volume = 250 mL.
Thus, the answer is 250 mL.
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What is this element help asap
Explanation:
In this element, there are:
11 protons (in blue)12 neutrons (in red), and11 electrons (in green)We find the element with atomic number 11, which is Sodium. (Na)
Answer: sodium
Explanation:
A gram of gasoline produces of energy when burned. Gasoline has a density of . How would you calculate the amount of energy produced by burning of gasoline
Answer:
1.66x10⁶kJ of energy are produced
Explanation:
...Produces 45kJ... Has a density of 0.77g/mL... By burning 48L of gasoline...
To solve this question we need to calculate the mass in grams of gasoline in 48L using its density.
With the mass and knowing 1gram produces 45kJ of energy we can find the energy produced by burning 48L of gasoline, thus:
mL of gasoline:
48L * (1000mL / 1L) = 48000mL of gasoline
g of gasoline:
48000mL * (0.77g/mL) = 36960g of gasoline
Energy produced:
36960g of gasoline * (45kJ / g) =
1.66x10⁶kJ of energy are producedHELLLLPPPPP PLeeease help im so tired and i need to SLEEP. Answer the 1s you know
1. How does the mechanical energy of a ball that is starting to fall compare to its total energy just before it hits the floor?
2. When you stand in sunlight, what form of energy is emitted by the sun?
3. An eye doctor wants to design reading glasses that also function as sunglasses. Should the eye doctor use a reflective-transparent material or a reflective-opaque material for the lenses? Support your claim.
Answer:
All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.
Answer:
1 kinetic and potential 3 reflective transparent
WHAT ELEMENT IS THIS
Answer: emission spectrum
Explanation: