The specific heat of unknown material : 3.675 J/g °C
Further explanationGiven
mass of block = 22.5 g
Q = heat = 2067 J
Δt=25 °C
Required
The specific heat
Solution
Heat can be formulated :
Q = m.c.Δt
Input the value :
2067 J = 22.5 g x c x 25 °C
c = 3.675 J/g °C
Why do we need light in order to see colors?
Answer:
Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. The surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.
Explanation:
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Most metals are solids at room temperature while most non-metals are gases at room temperature. What can you conclude about the attraction between atoms in aluminum metal compared to Nitrogen gas? A) All atoms attract with equal force of attraction. B) No conclusion can be made based on the information given. The aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. D) The atoms in nitrogen gas have atoms with greater attraction than The aluminum metal
Answer:
C
Explanation:
USA Test prep
The aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. Hence option C is correct.
What are metals?Metals are defined as a substance that appears shiny when freshly manufactured, polished, or broken, and conducts electricity and heat rather well. A metal element is an element with metallic bonding and positive ions. The periodic table contains mostly metals. The earth's crust is where most pure metals are found. The majority of the planet's iron mass, which makes up over a third of its mass, is located in its core.
Under a specific set of circumstances, a substance's state of matter is controlled by its molecular qualities rather than the other way around. While relatively weak intermolecular interactions promote the gaseous state, strong intermolecular forces favor a condensed form of matter (liquid or solid).
Thus, the aluminum metal has atoms with greater attraction than the atoms in nitrogen gas. Hence option C is correct.
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In which item are fuel cells more commonly used?
laptops
flashlights
solar panels
propane lanterns
A fuel cell require a continuous input of fuel and an oxidizing agent in order to sustain the reactions which generate the electricity. The item in which fuel cells more commonly used is propane lanterns. The correct option is D.
What is propane lanterns?The propane lanterns is one of the gas interns which is a lightweight portable device which supplies bright efficient light while protecting its contents from wind and brain. The gas interns are incandescent lights.
The gas interns burn fuel like propane, white gas or kerosene to generate heat and the heat causes the mantles to produce light. The mantles are defined as the ceramic mesh which encase the flame produced by the lantern.
The gas lanterns are very simple, any heated material will produce light. The lantern burns fuel to produce heat. The gas lanterns use mantles instead of limestone blocks. The mantles are highly efficient at producing light from the heat they acquire.
Thus the correct option is D.
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All of the land area that supplies water to a particular river system is called a
Answer:
A Watershed
Explanation:
A watershed consists of all the land that supplies water to a river system
Answer:
watershed
Explanation:
Question 9 (1 point)
Circuits can flow in any direction. (Lesson 5.05)
True
False
Answer:
It would be false because there are series circuit that only has one path
9. Write a balanced nuclear equation for the following: The isotope Strontium-90 decays by Q-
decay (1 point)
OfSr — He +56 kr
OS → H +39 kr
o Sr + Be +38kr
99 Sr → He +3 Se
SAST +7+99 Sr
Answer: [tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}[/tex]
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
General representation of an element is given as: [tex]_Z^A\textrm{X}[/tex]
where,
Z represents Atomic number
A represents Mass number
X represents the symbol of an element
General representation of alpha decay :
[tex]_Z^A\textrm{Sr}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha[/tex]
The balanced nuclear equation when the isotope Strontium-90 decays by Q- decay is :
[tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}[/tex]
What do you call the inside of an atom?
Answer:
protons, neutrons, and electrons
Explanation:
protons have a positive charge, neutrons have a neutrel charge, and electrons have a negative charge
What factor affects both kinetic energy and gravitational potential energy?
Answer:
The kinetic energy of an object is also measured in joules. Anything that is moving has kinetic energy, but various factors affect how much kinetic energy an object has. The first factor is speed. If two identical objects are moving at different speeds, the faster object has more kinetic energy. In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.
Explanation:
Answer: Potential energy is a little different. It is the energy an object has the potential to create. The energy produced is determined similarly to kinetic. It depends on the object's mass, the gravitational pull when up or down slopes, and the height of the reference point.
another explanation:
a) Potential Energy:
mass and height
We know that potential energy, PE is equal to the product of the mass, the gravitational acceleration and the height.
Since gravity is constant, the mass and height are the factors.
b) Kinetic Energy:
The mass (m) of the object and the speed (v) of the object.
Because kinetic energy is proportional to the velocity squared, increases in velocity will have an exponentially greater effect on transitional kinetic energy. Doubling the mass of an object will only double its kinetic energy, but doubling the velocity of the object will quadruple its velocity.
Which of the following phase changes requires the addition of thermal energy?*
• Condensation
• Vaporization
• Deposition
• Freezing
Will mark the person who answers correctly Brainliest<\3
Answer: Option (b) is the correct answer.
Explanation:
When thermal energy is added to a substance then there will occur an increase in the kinetic energy of molecules. As a result, motion of particles increases due to which a solid substance changes into liquid state and a liquid substance changes into gaseous state.
When a liquid substance gets converted into vapors or gaseous state then this process is called vaporization.
Thus, phase changes that requires the addition of thermal energy is vaporization.
What is the overall process of balancing an equation?
Answer:
You need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal. :)
It takes a force of 3000 N to accelerate an empty 1000 kg car at 3 m/s2. If a 160
kg wrestler is inside the car, how much force will be needed to produce the same
acceleration? *
Answer:
the force needed to produce the same acceleration is 480kg
The rate of acceleration of an object is determined by the mass of the object and...
A) The forces acting on the object
B) The change in kinetic energy of the object
C) The initial velocity of the object
D) The direction of movement of the object
Answer:
a. forces acting on the object
What elements are made from the body
Answer:
hydrogen oxygen carbon and nitrogen
If 45 moles of NH3 and 50 moles of NO2 react, which one is the limiting reactant ? 8 NH3 (g) + 6 NO2 --> 7 N2 (g) +12 H2O (g)
Answer:
NH₃ is limiting reactant .
Explanation:
Given data:
Number of moles of NH₃ = 45 mol
Number of moles of NO₂ = 50 mol
Limiting reactant = ?
Solution:
Chemical equation:
8NH₃ + 6NO₂ → 7N₂ + 12H₂O
Now we will compare the mole of reactants with products.
NH₃ ; N₂
8 : 7
45 : 7/8×45 = 39.4 mol
NH₃ ; H₂O
8 : 12
45 : 12/8×45 = 67.5 mol
NO₂ ; N₂
6 : 7
50 : 7/6×50 = 58.3 mol
NO₂ ; H₂O
6 : 12
50 : 12/6×50 = 100 mol
Less number of moles of product are formed by the ammonia thus it will be limiting reactant.
How much energy has your body used, in joules, if your health device indicates that 450 Calories were burned during your workout? How many Calories are in a dinner containing 3.5 x 10 to the power of 6 joules
Answer:
Explanation:
1 Calorie = 4184 Joules
450 Calories = 450 x 4184 J
= 188.28 x 10⁴ J
3.5 x 10⁶ joules
4184 joules = 1 Calorie
3.5 x 10⁶ joules = 836.52 Calories.
How do warm air molecules move?
A. They move quickly and rise over warm surfaces
B. They move slowly and rise over cold surfaces
C. They move quickly and sink over warm surfaces
D. They move slowly and sink over cold surfaces.
Answer:
A
Explanation:
Look at the above table.
1. What charge should Element 1 have (B)
A. 0
B. 1+
C. 6
D. 12
2. How many neutrons should Element 2 have (C)
A. 11
B. 7
C. 13
D. 6
3. How many valence electrons does carbon have?
A. 6
B. 2
C. 4
D. 3
Answer:
1. A. 0
2. B. 7
3. C. 4
Explanation:
1. charge is equal to the number of protons minus the number of electrons!
2. neutrons is equal to mass number minus atomic number!
3. valence electrons equal 4!
Hope this helped you! :)
Which type of bond will form between these elements?
O Metallic
O lonic
Covalent
Answer:
covalent
Explanation:
Please help asap. Didn’t have the right subject so i used the one closest to it.
In which period would i find mercury.
Answer:
6th period
Explanation:
what do you mean by sI unit
What is the multiplier used to find the MF?
This is chemistry (Empirical and Molecular from % Composition)
pls help!!!!
Answer:
Molecular Formulas for Compounds
Explanation:
What mass of radon is in 8.17 moles of radon?
Answer:
1813.74g
Explanation:
Given parameters:
Number of moles of radon = 8.17moles
Unknown:
Mass of radon = ?
Solution:
To solve this problem, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of radon = 222g/mol
Now insert the parameters and solve;
Mass of radon = Number of moles x molar mass
= 8.17 x 222
= 1813.74g
What is sublimation and what type change is this?
Answer:
Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase.
Explanation:
a bubble of methane gas rises from the bottom of the north sea, what will happen to the size of the bubble as it rises to the surface? explain your answer
Hope my answer helps you.
What best describes the atom if it has 9 protons, 9 neutrons and 10 electrons?
28. Which set of coefficients will balance this chemical equation?
_C2H4(9) + _O2(g) - 2002(g) + 2H20(9)
1,3
3,3
4,4
2,6
helpp! is Au an element, compound, or mixture?
Answer:
It's an element.
Explanation:
Au is gold. An "element " on the periodic table. Trust me. Im 100% sure.
Explanation:
gold is an element
{au 79 is the atomic number}
Identify the two gases jn the unknown mixtures.
Answer:
I believe Gases A and D
Explanation:
The lines in both gases match up with the lines in the unknown mixture.
Answer:
Fa (rt) and Nitrogen
Explanation:
How many moles of ammonia are in 0.175 L of 6.50 M aqueous ammonia solution? Find the numerical answer for this questions make sure to include the following : What is the chemical formula for ammonia? What is the formula for molarity ? When you give your numerical answer, what is the correct significant figures and how do you know that is the correct amount?
Moles of Ammonia (NH₃) in solution = 1.14
Further explanationGiven
0.175 L of 6.50 M aqueous ammonia
Required
moles of ammonia
Solution
Ammonia = NH₃
Molarity = moles of solute per liter of solution
[tex]\tt M=\dfrac{n}{V}[/tex]
n = M x V
n = 6.50 M x 0.175 L
n = 1.1375 moles
In a multiplication operation: the significant digits in the final product must follow the number of significant digits that are at least in the numbers involved in multiplying
6.50 = 3 sig fig
0.175 = 3 sig fig
So the result must be 3 sig fig
1.1375 rounded to 1.14