Answer:
Same.
Explanation:
The temperature of each 400mL bucket is about the same as the temperature of the original bucket of paint.
This is because the temperature is an intrinsic property.This means that temperature is independent of the quantity of matter. Therefore, the temperature of paint inside the bucket is not dependent on the amount of paint present.
The radius of a basketball hoop is 9 inches. Which expression can be used to find the
hoop's circumference in inches?
Answer:
2 [tex]\pi[/tex] r
Explanation:
Given that:
Radius of basketball = 9inches
Unknown:
Hoop's circumference = ?
Solution:
To solve this problem, we use the formula for the circumference of a circle.
The shape of the hoops is circular.
Circumference of a circle = 2 [tex]\pi[/tex] r
R is the radius of the basketball hoop
A student measures 10 g of baking soda and mixes it with 5 grams of vinegar. The mixture begins to bubble and fizz and feels cold to the touch. Once the reaction is over the student weighs the solution and discovers that the resulting mixture weighs only 12g. What happened to the missing 3 grams of product? Use the Law of Conservation of Matter in your answer.
Answer:
Some of the product is a gas that goes to the atmosphere.
Explanation:
Based on the chemical reaction of baking soda (Sodium bicarbonate: NaHCO₃) with vinegar (Acetic acid: CH₃COOH):
NaHCO₃(aq) + CH₃COOH(aq) → H₂O(aq) + CO₂(g) + CH₃COONa(aq)
When the reaction occurs, one of the products (CO₂) is a gas that will disappear of the mixture to stay in the atmosphere. That is the reason why there are missing 3 grams.
An atom contains 8 protons, 8 neutrons and 8 electrons. A second atom contains
8 protons, 10 neutrons and 10 electrons. What can be said about these two
atoms?
A. Both atoms are neutral
B. The atoms are isotopes of each other
C. Both atoms are ions
D. These atoms cannot exist in nature
Answer:
B. Isotopes mean having differing number of neutrons but having the same amount of protons basically.
Explanation:
B. The atoms are isotopes of each other
Further explanationGiven
The first atom : 8 protons, 8 neutrons and 8 electrons
The second atom : 8 protons, 10 neutrons and 10 electrons
Required
Comparison
Solution
A. Atom is said to be neutral if the number of protons and electrons is the same
The first atom neutral
The second atom - anion : charge = -2(10 electron-8 proton)
B. isotopes = the same atomic number and different mass number
The first atom : atomic number = 8, mass number = 16
The second atom neutral : atomic number = 8, mass number = 18
Both : isotopes
C. First atom = neutral, second atom anion (charge = -2)
D. Can exist in nature
A hydrogen atom absorbs a photon radiation causing an electron to jump from level one to level two. If the photon/radiation has a wavelength of 5.62 x 10^-3 m to calculate the frequency of the radiation absorbed and the energy change of the electron
Answer:
1.
First of all, let's convert the energy of the absorbed photon into Joules:
The energy of the photon can be rewritten as:
where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:
2. 1.24 eV
In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength
So the energy of the emitted photon is given by the formula used previously:
and using
we find
converting into electronvolts,
Explanation:
4.0 moles of H2O would have what mass?
Group of answer choices
18 g
23 g
68 g
72 g
Answer:
How many moles H2O in 1 grams? The answer is 0.055508435061792.
We assume you are converting between moles H2O and gram.
You can view more details on each measurement unit:
molecular weight of H2O or grams
This compound is also known as Water or Dihydrogen Monoxide.
The SI base unit for amount of substance is the mole.
1 mole is equal to 1 moles H2O, or 18.01528 grams.
Explanation:
The mass of 4.0 moles of water is 72 grams.
Explanation:
Moles of the substance is equal to the ratio of the mass of substance to the molar mass of the substance:[tex]Moles=\frac{\text{mass of substance}}{\text{molar mass of substance}}[/tex]
Given:
The 4.0 moles of water
To find:
Mass of moles of water
Solution:
The moles of water = 4.0 moles
The mass of water = M
The molar mass of water = 18.01528 g/mol
[tex]4.0=\frac{m}{ 18.01528 g/mol}\\m=4.0\times 18.01528 g/mol\\=72.06112 g\approx 72 g[/tex]
The mass of 4.0 moles of water is 72 grams.
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Bohr's model of the atom attempts to explain the idea that
the atom is mostly empty space
O all atoms of one type of element are identical
O energy is quantized
O protons and neutrons are found in the nucleus
Answer:
O energy is quantized
Explanation:
Bohr's model of that atom attempts to explain the idea that energy is quantized within an atomic space.
In 1913 Neils Bohr put forward his own model of the atom based on the quantum mechanics developed by Planck. He suggested that the extranuclear part consists of electrons in specific spherical orbits around the nucleus. As one moves outwards from the nucleus the energy level increases.Calcium is a metal that is part of bone. it has several naturally-occurring
isotopes. Calculate the average atomic mass. Ca-40 39.96amu 96.941%,
Ca-42, 41.96 amu 0.647%, Ca-43 42.96amu 0.135% Ca-44 43.96 amu
2.086%, Ca-48 47.95amu 0.187% *
pls help
The average atomic mass of Ca : 43.943 amu
Further explanationGiven
Isotopes of Ca
Required
The average atomic mass
Solution
Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
Avg atomic mass = m1.%m1 + m2.%m2....mn.%mn
m1 = isotope 1
m2 = isotope 2
% = abundance of the elements in nature
Input the value :
avg atomic mass = 39.96 x 0.96941 + 41.96 x 0.0647+42.96 x 0.0135 + 43.96 x 0.02086 + 47.95 x 0.0187
avg atomic mass =43.943 amu
Which of the following statements is true about the relationship between atoms and molecules? A. Most atoms are bonded together to make a molecule. B. An atom can be seen by scientists, but a molecule cannot. C. Atoms and molecules are the same and have no differences.
Answer:
I believe the answer is A. molecules are larger than atoms so they should be visible and atoms and molecules are indeed different
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.
What is atom?
Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. Most atoms are bonded together to make a molecule. Molecules combine to form compounds.
Therefore, the correct option is option A.
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What are the homologous series?
Explanation:
Homologous series are the series belonging to a series of aliphatic organic compounds that differ only by the addition of a CH2 group
Hope it will help :)❤
If you mix aqueous solutions of potassium nitrate and iron(II)sulfate what will be the precipitate, if there is one at all?
Answer:
No one will precipitated because these all are soluble in water
Explanation:
2KNO3 + FeSO4 -----> K2SO4 + Fe(NO3)2
Which element below would most likely gain 3 electrons?
Answer:
Lithium
Explanation:
How many moles are 21.67 L of NH4CI?
Answer:
0.967mole
Explanation:
Given parameters:
Volume of NH₄Cl = 21.67L
Unknown:
Number of moles = ?
Solution:
If we assume that the volume was taken at standard temperature and pressure,
Then;
Number of moles = [tex]\frac{volume }{22.4L}[/tex]
Number of moles = [tex]\frac{21.67}{22.4}[/tex] = 0.967mole
____ 1. Which is responsible for removing waste? ____ ____ ____ ____ 2. 3. 4. 5. brain c. Kidneys heart d. Lungs Which body system is responsible for removing waste from your body? respiratory c. Excretory circulatory d. reproductive Which is not a kind of blood vessel? valve c. Capillary artery d. Vein Which body system is responsible for producing offspring? respiratory c.Excretory circulatory d. reproductive Which body system is responsible for bringing food and oxygen to every cell in your body? respiratory c. excretory circulatory d. reproductive ____ 6. Which body system is responsible for carrying oxygen and carbon dioxide in and out of your body? ____ 7. respiratory circulatory Which is not a part of the circulatory system? c. d. excretory reproductive a. blood c. blood vessels b. heart d. trachea
Answer:
[tex]1)kidneys \\ 2)excretory \\ \: \: 3)valve \\ \: 4)reproductive \\ \: 5)circulatory \\ \: 6)circulatory \\\ \: 7)trachea \\ \\ \\ plzz \: mark \: as \: brainliest[/tex]
Which is a property of potassium (K)?
A. It is dull and brittle.
B. It is extremely reactive.
C. It is not reactive.
D. It is white and hard.
Answer:
B: It is extremely reactive
Explanation:
Potassium metal is also soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity.
Answer: Properties, occurrence, and uses. Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green.
Explanation: hope it helps
How many atoms of Oxygen are in 2.35 grams of SO2?
Answer:
There are 2 atoms of Oxygen (O) present in SO2 therefore it's atomicity is 2
What are half-reactions?
O A. Equations showing which elements are oxidized and which are
reduced
O B. Equations showing the electronegativities of atoms in a reaction
O C. Equations showing what compounds are involved in a reaction
O D. Equations showing only the ions involved in a net ionic equation
Answer:
A
Explanation:
A Equations showing which elements are oxidized and which are
Answer:
A.
Explanation:
Equations showing which elements are oxidized and which are
reduced
_____ are factors that are not tested and remain constant. A. Dependent variables B. Controlled variables C. Independent variables D. Constant variables
Answer:
B. Controlled variables
Explanation:
The Dependent sample t-test compares the mean score of measurements in one group to that of another other group. It mainly used when analyzing comparable sample units as it pairs repeatable observations within a time frame.
Controlled variables are factors that are not tested and remain constant. Some examples of controlled variables are temperature, pressure, volume etc
Given the unbalanced equation: ____ CaSO4 + ___AlCl3 --> ____ Al2(SO4)3 + _____ CaCl2
What is the coefficient of Al2(SO4)3 when the equation is completely balanced using the smallest whole-number coefficients?
Answer:
3CaSO₄ + 2AlCl₃ → Al₂(SO₄)₃ + 3CaCl₂
Explanation:
The reaction expression is given as:
_CaSO₄ + _AlCl₃ → _Al₂(SO₄)₃ + _CaCl₂
To balance the reaction above, let us a mathematical approach;
assign coefficients a, b, c and d to the species;
aCaSO₄ + bAlCl₃ → cAl₂(SO₄)₃ + dCaCl₂
Conserving Ca : a = d
S: a = 3c
O: 4a = 12c
Al: b = 2c
Cl: 3b = 2d
So;
let a = 1, d = 1, c = [tex]\frac{1}{3}[/tex] , b = [tex]\frac{2}{3}[/tex]
Multiply by 3 through;
a = 3, b = 2, c = 1 and d = 3
3CaSO₄ + 2AlCl₃ → Al₂(SO₄)₃ + 3CaCl₂
In what ways might the Ring of Fire have
changed in shape and size throughout time?
Explanation:
this question tion is so hard sorry but I can't do is sorry
how are waves reflected, absorbed, and transmitted through various materials
Answer:
Electromagnetic Radiation
Explanation:
When light shines on an object, it is reflected, absorbed, or transmitted through the object, depending on the object's material and the frequency (color) of the light. However, because light can travel through space, it cannot be a matter wave, like sound or water waves.
What would be the molar mass of sodium?
Answer:
Explanation: 29.99g/mol
Answer:
23.0 g/mol
Explanation:
To find the molar mass of sodium or Na, look at the periodic table.
Then try to find where sodium is.
After that, then try to check the atomic mass of sodium.
The atomic mass of sodium is 23.0
So the molar mass is 23.0 g/mol
That's it. Molar mass means the same thing as atomic mass.
Hope it helped!
What element of the compound caused the colors of the flames
Answer:
Flame colors are produced from the movement of the electrons in the metal ions present in the compounds. For example, a sodium ion in an unexcited state has the electron configuration [tex]1s^{2} 2s^{2} 2p^{6}[/tex].
Explanation:
Something that causes a response in an organism is called a(n) _____.
Which of the following reactions would have a decrease in entropy?
A. 2H20(g) → 2H2(g) + O2(9)
B. 2503(9) ► 2502(g) + O2(g)
C. 2NH3(9) ► N2(g) + 3H2(9)
D. 2NO2(g) → N204(9)
Answer:
D. 2NO2(g) → N204(9)
Explanation:
A p e x
2NO[tex]_2[/tex](g) → N[tex]_2[/tex]O[tex]_4[/tex](g) reactions would have a decrease in entropy. Therefore, the correct option is option D.
What is entropy?Entropy is a measureable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamic, where it was originally recognized, towards the microscopic explanation of nature within statistical physics, the name and concept are employed in a variety of disciplines.
It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, society, weather science, and information systems, especially the exchange of information. 2NO[tex]_2[/tex](g) → N[tex]_2[/tex]O[tex]_4[/tex](g) reactions would have a decrease in entropy.
Therefore, the correct option is option D.
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What is in the solar system?
A. All the above
B. asteroids and comets
C. The sun and everything thing that orbits around it
D. planets and their moons
PLEASE HELP
Answer:
all of the above
Explanation:
all of this is in the solar system
How many electrons does H have with a -1 charge
Answer:The electron has a negative charge and the proton has a positive charge, and these charges work against each other to make the electromagnetic force that holds the entire atom together.
Explanation:
This is the answer
And this one please thank you.
Answer:
E
Explanation:
Look at bottom numbers.
90 → 88 + x
it means,
90=88+x
hence x = 2
it is also valid for top numbers.
230=226+y
y = 4
A piece of mental with a mass of 106 g is placed in a 50 mL graduated cylinder.The volume rises from 20 mL to 31 mL. What is the destiny of the metal?
Answer:
9.64g/mL
Explanation:
Given parameters:
Mass of the metal = 106g
Volume of cylinder = 50mL
Volume difference = 31mL - 20mL = 11mL
Unknown:
Density of the metal = ?
Solution:
To find the density of the metal, we use;
Density = [tex]\frac{mass}{volume}[/tex]
Density = [tex]\frac{106}{11}[/tex] = 9.64g/mL
Which of the following is an example of a velocity?
O A. 3 m/s south
O B. 2 km/hr
O C. 8 m/s
O D. 12 m/s2 east
Answer:
A
Explanation:
velocity is a vector quantity, it has single direction.
B and C are speed while D is acceleration
Please recheck, for this may not be the correct answer
Answer:
i think its A or C
Explanation:
The article states that amplitude plays a role in what happens to a sound
wave. Why do you think higher amplitude waves are more often
transmitted while lower amplitude waves are reflected or absorbed?
Answer:
Sound waves travel through matter
Explanation:
Higher amplitude sound waves are more likely to be transmitted through matter instead of reflected. Lower amplitude sound waves are more likely to be reflected or absorbed, resulting in a lack of an echo. Sound can travel through air, water, and solids