Answer:
The atomic mass number is the number of protons and neutrons in an atom.
Two ways water and ice are the same
Answer:
1- water is ice
2- ice is water
Explanation:
1- the water is just froze
2- the ice is just solid water
If 4.25 grams of copper were plated out in the reaction:
3Cu2+ + 2Al ---> 3Cu + 2Al3+
What mass of aluminum would have dissolved?
Please show all work!
Answer:
gravwfewtu
Explanation:
ushifelllf
What would the unit of measurement be for the density of a regular solid?
Answer:
SI unit: kg/m³
but g/cm³ is commonly used
Explanation:
Which of the following is a simple definition of reduction?
A. the loss of electrons
B. the gain of electrons
C. an agent that oxidizes something
D. an agent that reduces something
The answer is B on Edg 2020
Answer:
B. the gain of electrons
Explanation:
An easy way to remember this concept is the pneumonic OIL RIG:
Oxidation is Loss (of electrons)
Reduction is Gain (of electrons)
Calcium hydroxide and hydrogen gas are produced by the reaction of calcium hydride and water
Explanation:
The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.
Answer: B) calcium hydride + water -> calcium hydroxide + hydrogen
Explanation: B) on EDG
Silver nitrate and magnesium chloride react according to the following equation:
2AgNO3(aq) + MgCl2(aq) — 2AgCl(s) + Mg(NO3)2(aq)
What volume (in ml) of 0.247M MgCl2(aq) is required to react with 63.2 mL of 0.192M AgNO3(aq)?
Answer:
V=24,3mL
Explanation:
1)n(AgNO3)=Cm*V=0.063l*0.192M=0.012
2)n(AgNO3)/2=n(MgCl2) => MgCl2=0.012/2=0.006
3)V(MgCl2)=n/Cm=0.006/0.247=0.0243L=24,3ml
A chemical reaction occurs. The equation is: MgO ---> Mg + 0 This is a
combination reaction
decomposition reaction
double replacement reaction
single replacement reaction
Answer:
decomposition reaction
Explanation:
oxygen is broken down from magnesium oxide (mgo)
I need help please!!!!!!
what are the 4 quantum numbers of Kr?
Answer:
2 8 18 8 those are the ones I believe.
Care to help me guys please
Answer:
A. Na₂SO₄ and HCl
C. Polar solutes are soluble in polar solvents but are insoluble in non-polar solvents Non-polar solutes are insoluble in polar solvents but are are soluble in non-polar solvents
Ionic solutes are soluble in polar solvents but are insoluble in non-polar solvents.
Like dissolves like simply means that molecules of substances having similar chemical properties dissolve in each other
Explanation:
A. Ionic substances like Na₂SO₄ are composed of charged particles called ions. These ions are either positively charged or negatively charged, therefore, they are attracted to substances of opposite charges. Also, polar molecules like HCl contains two oppositely charged ends. A polar solvent consists of molecules with two oppositely charged ends, therefore, ionic substances as well polar substances dissolve in them according to the concept of like dissolves like.
Gasoline being non-polar will only dissolve in like substances, polar solvents.
C. Polar solutes are soluble in polar solvents but are insoluble in non-polar solvents Non-polar solutes are insoluble in polar solvents but are are soluble in non-polar solvents
Ionic solutes are soluble in polar solvents but are insoluble in non-polar solvents.
The statement "Like dissolves like" simply means that molecules of substances having similar chemical properties dissolve in each other. For example gasoline, a non-polar substance will dissolve only in a non-polar solvent like kerosene. Also, HCl, a polar molecule will dissolve in a polar solvent like water.
Which of these compounds has the highest boiling point?
Pentene
Chloropentane
2 Pentanone
Pentane
Answer:
2-Pentanone is the answer.
Explanation:
How much heat is required to boil 78.5 gg of water at its boiling point?
Answer:
206 kj of heat is required to boil 78.5 kg of water at its boiling point
Carbon, nitrogen, and water are recycled through ecosystems many times.
Phosphorus-32 has a half life of 14.3 days. How many days will it take for a
radioactive sample to decay to one-eighth its original size?
It will take 42.9 days
Further explanationGeneral formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
t1/2=14.3 days
Nt/No=1/8
[tex]\tt Nt=No(\dfrac{1}{2})^{T/t1/2}\\\\\dfrac{Nt}{No}=\dfrac{1}{2}^{T/t1/2}\\\\\dfrac{1}{8}=\dfrac{1}{2}^{T/t1/2}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^{T/t1/2}\\\\3=T/14.3\rightarrow T=42.9~days[/tex]
What percentage of Canada's 2005 population was between the ages of 30 and 44?
Please help I will give brainiest
Answer:
frequency I think
Explanation:
yep most likely not it
pls help 40 points!! Augie created this chart about the two kinds of waves.
A 2-column table with 3 rows titled 2 Kinds of Waves. The first column labeled Title 1 has entries the transfer energy is perpendicular to the direction of the wave motion, particles move up and down, particles move only slightly. The second column labeled Title 2 has entries the transfer direction is parallel to the direction of wave motion, particles move side to side, particles move only slightly.
Which best labels the chart?
Title 1 is “Longitudinal Waves,” and Title 2 is “Transverse Waves.”
Title 1 is “Transverse Waves,” and T
its b
i did the quiz and got it right it is b
Answer:
b
Explanation:
took test on edge
an apple with a mass of 0.95 kilograms hangs from a tree branch 3.0 meters above the ground. what is the potential energy of the apple?
0.28j
2.8j
28j
280j
Answer:
285 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
PE = 0.95 × 10 × 30
We have the final answer as
285 JHope this helps you
Please help. Im not a very smart person
sort or group based on characteristics
The_______ and _____ are the main systems that move fluid throughout the body.
Answer:
circulatory system, lymphatic system
Explanation:
I just did the assigment and got it right.
When you put the lid on the simmering soup, the inside of the lid gets all wet. Identify the change of state of the inside of the lid
Answer:
The soup gets so hot it releases a gas state and it gets trapped in the lid. So the gas gets transformed into a gas into a liquid temperarily.
Explanation:
When scientists conduct investigations, they collaborate to support each other's research. What is the importance of scientists repeating the same experiment using the same steps?
It creates further questions to investigate, which creates more accurate results.
Having several trials that produce the same results is more accurate.
When multiple scientists repeat investigations, it allows them to investigate errors.
When scientists get more accurate results, the observations can be compared.
Answer:
b or c but most likely it is c
Explanation:
B. I just did this not lying a few minutes ago LOL
GL on the rest of your test!!!! :D
Match the part of the wave to its description.
Crest
Wavelength
Trough
Amplitude
These are the correct answer your welcome ;)
Answer:
sgsgueiehéyegeysuegeteue2
Answer:
Explanation:
The answers you put are correct...
crest- A crest point on a wave is the maximum value of upward displacement within a cycle. A crest is a point on a surface wave where the displacement of the medium is at a maximum.
wavelength- In physics, the wavelength is the spatial period of a periodic wave the distance over which the wave's shape repeats. (how long the wave is)
trough- A trough is the opposite of a crest, so the minimum or lowest point in a cycle.
amplitude- Amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path. ... Waves are generated by vibrating sources, their amplitude being proportional to the amplitude of the source.
Hope this helps! Have a great day!! :D
How many grams of ZNO shoulbe added to 30gms of 10%ZNO to get 15%oint
Mass of ZnO added=1.765 g
Further explanation:Given
30gms of 10%ZnO(Zinc oxide)
15% ZnO
Required
mass of ZnO added
Solution
Amount of ZnO in 30 gms of 10% ZnO =3 gms
For 15% ZnO : x= ZnO added
New solution = 30+x = 15%, so the equation :
[tex]\tt \dfrac{3+x}{30+x}=15\%\\\\15\%(30+x)=3+x\\\\4.5+0.15x=3+x\\\\1.5=0.85x\\\\x=1.765~gms[/tex]
7. Calculate the amount of energy required heat 100.g to the following: a. H2O(s) changes to H2O(l) at 0°C b. H2O(l) changes to H20 (s) at 0°C c. H2O(l) at 10°C changes to H2O(l) at 20°C
a=b=33400 J
c=4180 J
Further explanation
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
The heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
The heat of fusion for water at 0 °C : 334 J/g and the heat of vaporization at 100 °C : 2,230J/g
a. melting
[tex]\tt Q=100.334=33400~J[/tex]
b. freezing
[tex]\tt Q=100.334=33400~J[/tex]
c.raise the temperature(c water = 4.18 J/g C)
[tex]\tt Q=100\times 4.18\times (20-10)=4180~J[/tex]
if an atom contains one electron and one proton,will it carry any charge or not
Answer:
no it will have no charge...it would be electrically neutral! because the number of protons and electrons are equal!
How many molecules are there in 560 grams of CoCl2?
Answer:
25.89 × 10²³ molecules
Explanation:
Given data:
Mass of CoCl₂ = 560 g
Number of molecules present = ?
Solution:
Number of moles of CoCl₂:
Number of moles = mass/molar mass
Number of moles = 560 g/ 129.84 g/mol
Number of moles = 4.3 mol
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
4.3 mol × 6.022 × 10²³ molecules /1 mol
25.89 × 10²³ molecules
Carbon-14 has a half-life of 5715 years. It is used to determine the age of
ancient objects. If a sample today contains 0.060 mg of carbon-14, how much
carbon-14 will be present after 28,575?
The sample of Carbon-14 after 28,575 years=0.001875 mg
Further explanationGeneral formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Carbon-14 has a half-life of 5715 years, so t1/2=5715 years
A sample today contains 0.060 mg of carbon-14, so No=0.06 mg, then :
[tex]\tt Nt=0.06(\dfrac{1}{2})^{28575/5715}\\\\Nt=0.06(\dfrac{1}{2})^5\\\\Nt=0.001875~mg[/tex]
A balloon originally had a volume of 4.39 L at 44C and a pressure of 729 torr  to what temperature must the balloon be cooled to reduce its volume to 3.78 L of the new pressure is at 1.0 atm
The new temperature : 11.56 °C
Further explanationBoyle's law and Gay Lussac's law
[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = final gas pressure
V2 = final gas volume
T1 = initial gas temperature (K)
T2 = final gas temperature
V₁=4.39 L
T₁=44+273=317 K
P₁ = 729 torr = 0,959211 atm
V₂=3.78 L
P₂= 1 atm
[tex]\tt \dfrac{0.959211\times 4.39}{317}=\dfrac{1\times 3.78}{T_2}\\\\T_2=\dfrac{1\times 3.78\times 317}{0.959211\times 4.39}\\\\T_2=284.559~K=11.56~C[/tex]