Answer:
Potential energy is the amount of energy calculated from an object's height off the ground.
Explanation:
Potential energy = Mass x Height x Gravity
What state of matter has indefinite volume and is compressible?
a. Gas
B. Liquid
C. Both Liquid and Gas
D. Solid
How many hours will it take for only 1.5625 mg to remain
Answer:
36 hours
Explanation:
Notice that you are given the actual table of how the isotope reduces , and it shows that for each period of 6 hours the isotope decays to half of the initial number.
EVery 6 hours, the reduction in number of mg of the isotope goes down in half'
100 mg, then 50 mg, then 25 mg, then 12.5 mg, then 6.25 mg, then 3.125 mg and finally (reaching 1.5625 mg
That was 6 periods of 6 hours each, which totals: 6 time 6 hours = 36 hours
The type of radioactive decay in which the mass number and atomic number remain unchanged is (2 points) Select one: a. beta radiation. b. alpha radiation. c. positron radiation. d. gamma radiation.
Answer:
d.
Explanation:
a. beta radiation - electrons that have negative charge, and when they leave a nucleus , the charge or atomic number of the nucleus will change.
b. Alpha radiation - nuclei of He, atomic number and mass number will be changed.
c. positron radiation - positrons are similar to electrons but have positive charge, so , the charge or atomic number of the nucleus will change.
d. gamma radiation is electromagnetic waves, does not have charge and mass.
Answer:
the answer is d. gamma radiation
Explanation:
1. Identify whether each of the elements is a metal, non-metal, or metalloid:
Ruthenium: Neon:
Germanium: Neptunium:
Iodine: Strontium:
Cesium: Europium:
Answer:
neon - non metal
Explanation:
Answer:
Ruthenium → metalloidNeon → non-metalGermanium → metalloidNeptunium → metalIodine → non-metalStrontium → metalCaesium → metalEuropium → metalWhat are the units of measurement for atomic radius?
Answer:
Units used to measure atomic radius:
Angstroms (Å): This the most common unit used. Equivalent to 1.0 x 10-10 meters.
Nanometer (nm): Equivalent to 1.0 x 10-9 meters.
Picometer (pm): Equivalent to 1.0 x 10-12 meters.
The atomic number of an atom is
a) The mass of the atom
b) The number of protons added to the number of neutrons
c) The number of protons
d) Negatively charged
Answer:
b, the number of protons added to the number of neutrons
Explanation:
Calculating pH
DETERMINE THE PH OF EACH SOLUTION
» [H] = 1 x 10-9M
pH =
» POH = 3
pH =
» [OH ) = 1 x 10-2 M
pH =
» POH = 7
pH =
Answer:
The answer to your question is given below
Explanation:
1. Data obtained from the question include:
Hydrogen ion concentration, [H+] = 1x10^-9M
pH =..?
pH = - log [H+]
pH = - log 1x10^-9
pH = 9
2. Data obtained from the question include:
pOH = 3
pH =.?
Recall:
pH + pOH = 14
pH + 3 = 14
Collect like terms
pH = 14 - 3
pH = 11
3. Data obtained from the question include:
Hydroxide ion concentration, [OH-] = 1x10^-2M
pH =..?
First, we shall determine the pOH. This is illustrated below
pOH = - Log [OH-]
pOH = - Log 1x10^-2
pOH = 2
Finally, we can obtain the pH as follow:
pH + pOH = 14
pOH = 2
pH + 2 = 14
Collect like terms
pH = 14 - 2
pH = 12
4. Data obtained from the question include:
pOH = 7
pH =.?
Recall:
pH + pOH = 14
pH + 7 = 14
Collect like terms
pH = 14 - 7
pH = 7
In the photoelectric effect, what happens when light hits the metal?
A. Electrons are knocked off atoms, causing electricity to flow.
B. Electricity is produced in the metal, causing light to be emitted.
C. Light is reflected off the metal, causing electrons to form.
D. Electrons are pumped into the metal, causing electricity to flow.
Answer: A. Electrons are knocked off atoms, causing electricity to flow.
Explanation:
Photoelectric effect is defined as emission or ejection of electrons from the surface of a metal when a light of certain frequency falls on the surface of the metal. Electrons emitted in this effect can be called photoelectrons.
The light which falls on the surface of the metal must be of sufficiently high frequency called as threshold frequency.
Thus light knocks off the electrons and thus the flow of electrons will result in the production of electricity.
Thus the correct option is Electrons are knocked off atoms, causing electricity to flow.
As much sugar as will dissolve is added to hot water. The water is then
cooled, and all of the sugar remains dissolved in the solution. Which term
describes the final sugar solution?
O A. Nonsaturated
O B. Saturated
C. Unsaturated
O D. Supersaturated
Balance the combustion reaction between octane and oxygen.
2C ₈ H ₁₈ + O ₂ → CO ₂ + H ₂ O
Answer:
The answer is 2C8H18 + 25O2 → 16CO2 + 18H2O .
(Correct me if I am wrong)
This part of the nervous system is the decision-
maker for the rest of the nervous system. What is it called?
o Brain
o Sensory Neurons
O Motor Neuron
o Spinal Cord
Please help me thank you
What happens at the particle level during a chemical reaction?
Answer:
Reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.RT
Explanation:
Subtract to find the temperature changes
for the water and the metal.
AT (water) =
AT (metal) =
Answer:
Explanation:
The temperature changes for the water and the metal is
ΔT (water) = 4.7°C
ΔT (metal) = - 72.9°C
Specific HeatThe quantity or amount of heat per unit mass required to raise the temperature of a body by one degree Celsius is known as specific heat. The unit of specific heat are joules or calories per gram per degree Celsius. Specific heat is an intensive property.
Calculate the temperature changesRelationship between temperature and heat is expressed as:
Q = mcΔT
where,
Q is heat energy in Joules (J)
m is mass (in grams)
c is specific heat in J/g°C
ΔT is change in temperature
Now calculate the temperature changes for the water
ΔT (water) = T(final) - T(initial)
= 27.1 - 22.4
= 4.7°C
Now calculate the temperature changes for the metal
ΔT(metal) = T(final) - T(initial)
= 27.1 - 100
= -72.9°C
Thus, from the above calculation we can see that the temperature changes for the water and the metal is
ΔT (water) = 4.7°C
ΔT (metal) = - 72.9°C
Learn more about the specific heat here: https://brainly.com/question/21406849
#SPJ2
In The diagram which part is negatively charged?
• solid Cu
• wire
• salt bridge
• solid Zn
Answer:
Solid Zn
Explanation:
I took the test :-)
In the diagram solid Zn is negatively charged.
When is solid Zn is negatively charged?Zinc is known as a element that acts as a negative electrode based on the fact that it has more negative potential and acts as the anode.
Based on the fact that zinc is a metal, it is known to often forms metallic compounds with other kinds of metals and based on the fact that it also has an ion charge of +2, the zinc ions are referred to as a strong reducing agents and thus do form ionic bonds.
Learn more about negative charge from
https://brainly.com/question/24449649
What is the name of the body part that passes messages
from the sensory neurons to the brain?
o Lungs
O Nerve Cells
o Brain
o Stimulus please help me thanks
Which state of matter is by high density and definite shape?
A. Solid
B. Liquid
C. Both Liquid and Solid
D. Gas
Answer:
Solid
Explanation:
Solid has a definite shape and its molecules have high density.
Hope this will help you.
what is characteristics of the 6kingdoms
Answer:
Archaea, Bacteria, Protista, Fungi, Plantae, and Animalia
What is characteristics of the 6 kingdoms.
6 kingdoms of what? Are you talking about biology?
If yes I assume you're talking about the defitions for the animal kingdom made by Woese and his colleagues in 1977.
Eubacteria: Single-celled bacterial organisms.
Archaebacteria: Single celled bacterial organisms that live in extreme enviroments
Protista : Single-celled organisms more complex than bacteria
Plantae: Multi-celled, complex organisms that produce their own food
Fungi: Multi-celled organisms that don't produce their own food
Animalia: Complex, multi-celled, organisms that consume other organisms for food.
How much less carbon does
natural gas release than
coal?
Answer:
natural gas releases 50 to 60 percent less carbon dioxide than coal
Explanation:
Natural gas is a fossil fuel, though the global warming emissions from its combustion are much lower than those from coal or oil. Natural gas emits 50 to 60 percent less carbon dioxide (CO2) when combusted in a new, efficient natural gas power plant compared with emissions from a typical new coal plant [1].
A 390 mL solutions of 4.6 M HCl is left out over the weekend and 74 mL of solvent evaporates. What is the new concentration of HCl?
Answer:
5.7 M
Explanation:
You have .390 L of 4.6 M HCl.
.390 L * 4.6 mol/L = 1.794 mol HCl
.390-.074=.316 L solvent remaining
1.794 mol/.316 L=5.7 M HCl
Which of the following is NOT an
example of matter?
a. clouds
b. gasoline
С. ice
d. light
Answer:
Which of the following are not examples of matter, well clouds are matter, gasoline is matter, ice is matter, so it would be light.
A planetary explorer vehicle
on Earth weighs 1850
pounds, what would it weigh
on the surface of Neptune,
which has 1.2 times the
gravity of Earth?
A. more than on the Earth
B. less than on the Earth
C. the same as on Earth
Answer:
more
Explanation:
Answer:
A. More than on the Earth
Explanation:
A5.3 * 1012 kg satellite is 1.800 m from another satellite that has a mass of 3.5 x 108 kg. What is the gravitational
force between the satellites?
3.82 x 10N
6.87 x 107N
5.72 % 1014 N
1.03 * 1018 N
Answer:
The gravitational force between the satellites is [tex]3.81\times 10^{10}\ N[/tex].
Explanation:
Mass of satellite 1, [tex]m_1=5.3\times 10^{12}\ kg[/tex]
Mass of satellite 2, [tex]m_2=3.5\times 10^8\ kg[/tex]
Distance between masses is 1.8 m
It is required to find the gravitational force between the satellites. The formula used to find the force between two masses is given by :
[tex]F=G\dfrac{m_1m_2}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{5.3\times 10^{12}\times 3.5\times 10^8}{(1.8)^2}\\\\F=3.81\times 10^{10}\ N[/tex]
So, the gravitational force between the satellites is [tex]3.81\times 10^{10}\ N[/tex].
please help me!!!!!!!! if the temperature of your ice is 32 percent Fahrenheit and your water is 68 Fahrenheit and you mixed the ice and the water together what temperature is your water?
Answer:
36 degrees farenheit
Let's say you added too much magnesium in the amount of 0.1594 g. How much 8.00 M HCl (in mL) would be required to decompose the excess Mg present?
Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g)
Answer:
1.65×10^-3 L or 1.65 mL
Explanation:
Number of moles of magnesium in the excess reagent= mass of excess reagent/ molar mass of magnesium
Mass of excess magnesium= 0.1594 g
Molar mass of magnesium= 24 gmol-1
Number of moles of magnesium= 0.1594/24 = 6.6×10^-3 moles
From the reaction equation;
1 mole of magnesium reacted with 2 moles of HCl
6.6×10^-3 moles of magnesium will react with 6.6×10^-3 moles × 2= 13.2×10^-3 moles of HCl
But we know that;
Number of moles of HCl= concentration of HCl × volume of HCl
Volume of HCl= number of moles of HCl/ concentration of HCl
Since concentration of HCl= 8.00M
Volume of HCl= 13.2×10^-3/8.00= 1.65×10^-3 L or 1.65 mL
A student is trying to dissolve 20 grams of sugar in a beaker containing 250 milliliters of water at room temperature. What can the student do to make the sugar dissolve faster in the water?
Answer:
They can warm up the water. Sugar dissolves much faster in warm/hot water.
A perfect example of this is when you put sugar in your hot coffee/tea -> it will dissolve almost immediately. If you put sugar in cold water, you will have to stir it for quite some time before it dissolves.
Balance this equation. If a coefficient of "1" is required, choose "blank" for that box.
C + Fe ₂ O ₃ → CO ₂ + Fe
Answer:
3C + 2Fe ₂ O ₃ → 3CO ₂ + 4Fe
Explanation:
C + Fe ₂ O ₃ → CO ₂ + Fe
Left Side
C = 1
Fe = 2
O = 3
Right Side
C = 1
Fe = 1
O = 2
So we can see that while Carbon is balanced Fe and O are not.
We then attempt to balance the equation by balancing the Oxygen.
C + 2Fe ₂ O ₃ → 3CO ₂ + Fe
Left Side
C = 1
Fe = 4
O = 6
Right Side
C = 3
Fe = 1
O = 6
Oxygen is now balanced but C and Fe are not, though this is an easy fix as each are independent on each side of the equation.
3C + 2Fe ₂ O ₃ → 3CO ₂ + 4Fe
Left Side
C = 3
Fe = 4
O = 6
Right Side
C = 3
Fe = 4
O = 6
Answer:
2 , 3 , 4 , 3
Explanation:
Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to?
Answer:
the air would be much cleaner and better for us to breath.
Explanation:
A compound contains 57.2 percent carbon, 6.1 percent hydrogen, 9.5 percent nitrogen, and 27.2 percent oxygen. What the empirical formula of the compound?
Answer:
So the empirical formula is C14H18N2O5
Explanation:
C = 57.2% = 12g/mol
H = 6.1% = 1g/mol
N = 9.5% = 14g/mol
O = 27.2% = 16g/mol
Empirical Formula for compound hmm
Assume
C = 57.2g
H = 6.1g
N = 9.5g
O = 27.2g
So we have
C = 57.2g/12g = 4.76 moles
H = 6.1g/1g = 6.10 moles
N = 9.5g/14g = 0.68 moles
O = 27.2g/16g = 1.70 moles
Divide each mole value by the smallest number of moles calculated. Round to the nearest whole number.
C = 4.76 moles / 0.68 moles = 7
H = 6.10 moles / 0.68 moles = 9
N = 0.68 moles / 0.68 moles = 1
O = 1.70 moles / 0.68 moles = 2.5
Ok so we now have the ratios but for O it's 2.5, have to be whole numbers so we will need to double all the numbers.
C = 14
H = 18
N = 2
O = 5
So the empirical formula is C14H18N2O5
Choose the correct coefficients to balance the following equation: __CaCO3 + __HC; Produces __CaCl2 + __CO2 + __H2O
Answer:
CaCO3 + 2HCl = CaCl2 + CO2 + H2O
Explanation:
CaCO3 + HCl = CaCl2 + CO2 + H2O
Error in equation should be HCl on left hand side not HC
Left Side
Ca = 1
C = 1
O = 3
H = 1
Cl = 1
Right Side
Ca = 1
C = 1
O = 3
H = 2
Cl = 2
So we'll try and balance the Chlorine
CaCO3 + 2HCl = CaCl2 + CO2 + H2O
Left Side
Ca = 1
C = 1
O = 3
H = 2
Cl = 2
Right Side
Ca = 1
C = 1
O = 3
H = 2
Cl = 2
Yay it worked
2
3
4
5
6
What did Virchow observe that led him to determine one of the main components of cell theory?
Answer:
In the year 1850, Rudolf Virchow was studying cells under a microscope, when he observed that cells were dividing and forming new cells. Realizing what he had observed, he understood that living cells reproduce new cells through division
