When an object moves, stops moving, changes speed, or changes direction, how do
scien sts describe that condition?
Study the reaction.
2H2 + O2 + 2H20
What is the mole ratio for the reaction between oxygen (O2) and hydrogen (Hz)?
O 2 oxygen to 1 hydrogen
O 1 oxygen to 2 hydrogen
O 4 oxygen to 2 hydrogen
O 2 oxygen to 2 hydrogen
HELPPP
Hey does anyone know how to find valence electrons in any periodic table element?
Answer:
Number of valence electrons = Group number of the element on the periodic table.
Explanation:
Hope that helps ^^
To make the future development more eco-friendly and decrease soil erosion,
choose one of the following recommendations:
Answer:
build better enclosures to decrease overgrazing by livestock.
Explanation:
Choose the atom or ion that is larger.
Select one:
a. S
b. S-2
Answer:
In general, anions are larger than the corresponding neutral atom, since adding electrons increases the number of electron-electron repulsion interactions that take place. Cations are smaller than the corresponding neutral atoms, since the valence electrons, which are furthest away from the nucleus, are lost.
Explanation:
The ion S⁻² (sulfide ion) is larger than the atom S (sulfur atom).
b. S⁻²
Atoms are composed of a nucleus at the center, containing protons and neutrons, and a cloud of electrons surrounding the nucleus. The size of an atom is determined mainly by the arrangement and energy levels of its electrons.
When an atom gains electrons to become an ion, it undergoes a process called electron gain or electron attachment. In this case, sulfur (S) has six valence electrons (electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁴). It tends to gain two electrons to achieve a stable electron configuration similar to the nearest noble gas, argon (Ar: 1s² 2s² 2p⁶ 3s² 3p⁶). By gaining two electrons, sulfur forms the sulfide ion (S⁻²), which has an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶.
When an atom gains electrons to become an ion, it forms a negatively charged ion, and this is the case for S⁻². The extra electrons in the ion's electron cloud cause repulsion, leading to an increase in the ion's size compared to the neutral atom. In other words, the addition of two extra electrons in the S⁻² ion increases its electron cloud's size, making it larger than the S atom.
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Zi notices the spilled product, and comments that it looks different from the original ingredients. Carlotta explains that all substances have distinctive physical and chemical properties; for example, _____ are examples of physical properties.
Density, Melting point, Boiling point and Hardness are examples of physical properties.
What is physical properties?A physical property refers to that property which is measurable and whose value indicates a state of a physical system. Examples of physical properties are Density, Melting point, Boiling point and Hardness so we can conclude that Density, Melting point, Boiling point and Hardness are examples of physical properties.
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1. What is a metal replacement reaction?
Answer:
a reaction in which one element is substituted for another element in a compound
Explanation:
3. in a purity check for industrial diamonds, a 10.25 degrees carat (1carat = 0.2000g) diamond is heated to 74.21 °c and immersed in 26.05 g of water in a constant pressure calorimeter. the initial temperature of the water is 27.20 ^ c . the final temperature of the system is 27.65 °c. calculate the specific heat of the diamond.
From the calculations, the specific heat capacity of diamond is 42.36 J/Kg/°C.
What is specific heat capacity?The specific heat capacity is the heat absorbed or emitted when 1Kg of a susbtance is heated such that its temperature is increased by 1 K.
Now;
Mass of water = 26.05 g or 0.026 Kg
Mass of diamond = 2.05 g or 0.00205 Kg
specific heat capacity of water = 4200 J/Kg/°C
specific heat capacity of diamond = ?
Initial temperature of water = 27.20°C
Initial temperature of diamond =74.21 °c
Final temperature of the diamond and water = 27.65 °c
Heat lost by diamond = heat gained by water
mcdT = mcdT
0.00205 Kg * c * ( 74.21 °c - 27.65 °c ) = 0.026 Kg * 4200 J/Kg/°C * (27.65 °c - 27.20°C)
0.116c = 4.914
c = 4.914/0.116
c = 42.36 J/Kg/°C
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Which of theses best explains whether alchemy is a science or pseudoscience?
If a sound wave speeds up and its frequency does not change, what happens to the wavelength?
Answer: No, the speed of propagation is constant in a given medium; only the wavelength changes as the frequency changes.
Explanation:
Did I do number one correctly???
Explanation:
yup you are right. The answer is 2,3- Dimethyl butane
If you zoom all the way in, what is the smallest object on the head of the pin?
Which has the highest viscosity? Why? water b. tea c. milk d. honey
Answer:
Honey
Explanation:
i know why but at the same time i don't. i know that water, tea, and milk are very fluid however honey is sticky and isn't AS FLUID as the others.
Therefore, honey as the highest viscosity.
How did Ernest Rutherford's experiment relate to J.J. Thomson's work?
A Rutherford looked for magnetic fields, while Thomson looked for electric
fields.
B Rutherford repeated Thomson's experiment and confirmed the results.
C Rutherford tested a conclusion based on Thomson's results.
D Rutherford had not known about Thomson's experiment.
Answer:
D
Explanation:
I am sorry if wrong
Answer:
C
Explanation:
I tested the other answer and it was wrong, when I put C I got 100... Your welcome!
The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are:
69.2% for a mass of 63
30.8% for a mass of 65.
Answer:
Take the weighted average of the individual isotopes.
Explanation:
63
C
u
has
69.2
%
abundance.
65
C
u
has
30.8
%
abundance.
So, the weighted average is
62.93
×
69.2
%
+
64.93
×
30.8
%
=
63.55
amu
.
If we look at the Periodic Table, copper metal (a mixture of isotopes but
63
C
u
and
65
C
u
predominate) has an approximate atomic mass of
63.55
g
⋅
m
o
l
−
1
, so we know we are right.
What effect do you think boiling and freezing would have on amylase enzyme.
Answer:
boiling have an effect while freezing so not
Help Please
10.
In order to do work on an object, what is true about the force that must be exerted?
The force must be in a direction opposite to Earth’s gravitational force.
The force must be the maximum amount of force one is able to exert.
The force must be in the same direction as the object’s motion.
The force must be quick and deliberate.
Answer:
The force must be in the same direction as the object’s motion
Explanation:
Force is a physical quantity.
It is defined as the force applied to a body to move it in the direction of the force applied.
Force = mass x acceleration.
Force results in the acceleration of a body. Force causes the change in position of a body and it moves it towards the direction of the applied force. A force is a vector quantity having both magnitude and direction.So, option is C is the correct choice.
What type of chemical reaction is the following: CH4 + O2 ➜ CO2 + H2O
Complete combustion of an alkane (methane)
You're essentially burning CH4 in the excess presence of oxygen gas, which results in the liberation of water and carbon dioxide
What is the maximum number of electrons possible in energy level 4?.
Answer:
I think its 32 electrons
Explanation:
im so sorry if im wrong!
Answer:
32 electrons :)
Explanation:
Which process is separating out solute from a solvent through evaporation?.
Crystallisation
(used to separate solids from a solution)
Hope this helps!
Elements in the same period have the same ________________________.
Explain the difference between a metal and a nonmetal
WILL GET BRAINLIEST!!!!!
I need help filling out this table, please help ASAP
Answer:
A-20 B-40 C-Ca D-10 E-9 F-F
Explanation:
----------------------------------------------atomic number= no.of protonsand mass no.= no. of protons+no. of neutrons__________________________A= 20B= 40C= caD= 10E= 9F=FThe chemical equation below shows the decomposition of ammonium nitrate (NH4NO3). NH4NO3 Right arrow. N2O 2H2O A chemist who is performing this reaction starts with 160. 1 g of NH4NO3. The molar mass of NH4NO3 is 80. 03 g/mol; the molar mass of water (H2O) is 18. 01 g/mol. What mass, in grams, of H2O is produced? 9. 01 grams 18. 01 grams 36. 03 grams 72. 06 grams.
72.06 grams is the mass of produced H₂O in the given reaction.
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
NH₄NO₃ → N₂O + 2H₂O
From the stoichiometry of the reaction it is clear that:
1 mole of NH₄NO₃ = produce 2 mole of H₂O
Given mass of NH₄NO₃ = 160.1 g
Molar mass of NH₄NO₃ = 80.03 g/mole
Mole of NH₄NO₃ = 160.1 g / 80.03 g/mole = 2 moles
2 moles of NH₄NO₃ = produce 2 × 2 = 4 moles of H₂O
Molar mass of H₂O = 18.01 g/mol
So, required mass of H₂O will be calculated as:
W = 4mol × 18.01 g/mol = 72.06 grams
Hence, 72.06 grams is the mass of H₂O.
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Calculate the pOH of this solution. Round to the nearest hundredth. PH = 1. 90 pOH =.
Answer:
it's 12.10
Explanation:
pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions. The pOH of this solution is 12.10.
What is pH and pOH ?pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions.
It is a scale used to determine the solution's hydrogen ion ( H⁺ ) concentration. It is a scale used to determine the solution's hydroxide ion ( OH⁻ ) concentration.
The difference between the two is that [OH-] represents the concentration of [OH-] or the molarity of OH-. It basically represents the concentration of OH- that is produced when a strong base reacts with water for example. pOH is a value that represents the basicity of a solution.
pH + pOH = 14
1.90 + pOH =14
pOH = 14 - 1.90
pOH = 12.10
Thus, the pOH of this solution is 12.10.
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How does the temperature of water change when it is placed in a freezer and
then begins to freeze?
A: It decreases first and then increases.
B. It increases first and then remains constant.
C. It decreases first and then remains constant.
D. It increases first and then decreases.
Answer:
It decreases first and then remains constant.
Explanation:
Answer:
It decreases first and then remains constant.
Explanation:
someone please help me i dont understand how too do these
Answer:
0.55
Explanation:
When multiplying values, the number of significant figures in the answer should be the same as the number with the lowest sig figs in the problem which in this case is 2 sig figs (0.17)
3.22 * 0.17 = .5474
Rounded to 2 sig figs = 0.55
Match the following.
1.
an agreement to temporarily cease fighting
recession
2. an economic setback in commercial and industrial activity
reparations
3. indemnities paid by defeated countries for acts of war
armistice
Answer:
The answer is number 1
Explanation:
this is because cease means to stop,and recession also means to squeeze
Please help meee ( please answer all )
Answer:
Au = Element
NaCl = Compound
Salad = Heterogeneous
NaCl & Water = Homogeneous
A 65.0 g sample of copper (specific heat = 0.20 J/g °C) is heated to 97.6 °C and then
placed in a container of water at 20 °C. The final temperature of the water and copper is
24.9 °C. What is the mass of the water in the container, assuming that all the heat lost
by the copper is gained by the water?
A 65.0 g sample of copper at 97.6 °C is added to 46.1 g of water at 20 °C, reaching a final temperature of 24.9 °C.
What does the law of conservation of energy state?In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
Step 1: Calculate the heat lost by the sample of copper.A 65.0 g (m) sample of copper is cooled from 97.6 °C to 24.9 °C. Given that its specific heat (c) is 0.20 J/g.°C, we can calculate the heat (Q) lost using the following expression.
Q(Cu) = c(Cu) × m(Cu) × ΔT
Q(Cu) = (0.20 J/g.°C) × 65.0 °C × (24.9 °C - 97.6 °C) = -945 J
Step 2: Calculate the heat gained by the water (Qw).We will use the law of conservation of energy.
Qw + Q(Cu) = 0
Qw = -Q(Cu) = 945 J
Step 3: Calculate the mass of water.We will use the same expression as in Step 1.
Qw = c(w) × m(w) × ΔT
m(w) = Qw / c(w) × ΔT
m(w) = 945 J / (4.18 J&g.°C) × (24.9 °C - 20 °C) = 46.1 g
A 65.0 g sample of copper at 97.6 °C is added to 46.1 g of water at 20 °C, reaching a final temperature of 24.9 °C.
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