Answer:
In the early 1900s, Ernest Rutherford studied (among other things) the organization of the atom — the fundamental particle of the natural world. Though atoms cannot be seen with the naked eye, they can be studied with the tools of science since they are part of the natural world.
The diagram below shows the different phase transitions that occur in matter. Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid. Which best describes the process that arrow 1 represents? Molecules are speeding up during boiling. Molecules are depositing as ice on a surface. Molecules are slowing down during condensing. Molecules are moving from stationary positions.
Answer:
A. Molecules are speeding up during boiling.
Explanation:
Answer:it’s A molocules are spending up during boiling
Explanation:got it right on ed
A patient is given 0.050 mg of technetium-99 m (where m means metastable—an unstable but long-lived state), a radioactive isotope with a half-life of about 6.0 hours.
How long until the radioactive isotope decays to 1.3×10−2 mg ?
The correct answer is 9.6h.
As you know, a radioactive isotope's nuclear half-life tells you exactly how much time must pass in order for an initial sample of this isotope to be halved.
Using the formula , A = Ao. [tex]1/2^n[/tex]
where , A- final mass after decay
Ao - initial mass
n - the number of half-lives that pass in the given period of time
Now, putting all the values, we get
1.3 × [tex]10^-2[/tex] mg = 0.050 mg × [tex]1/ 2^n[/tex]
Take the natural log of both sides of the equation to get,
㏑[tex](1.3 . 10^{-2} / 0.050 )[/tex] = ㏑[tex]((1/2)^{n})[/tex]
㏑[tex](1.3 . 10^{-2} / 0.050 )[/tex] = n. ln[tex](1/2)\\[/tex]
n = 1.6
Since n represents the number of half-lives that pass in a given period of time, you can say that
[tex]n = t / t _{1/2}[/tex]
t= 1.6 × 6 h
t = 9.6h
Hence, it will take 9.6 h until the radioactive isotope decays.
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Which metric prefix is used for hundredths ( 0.01) ?
How much energy, in kWh, is used if a hair dryer with a power of 20 watts was used for
0.5 hours? (Remember to convert to kW first!!!!)
Answer:
0.01kWh
Explanation:
Given parameters:
Power = 20watts
Time = 0.5hrs
Unknown:
Energy of other dryer = ?
Solution:
The electrical energy of the dryer can be calculated using the expression below;
Electrical energy = IVt
P = IV
I is the current
V is the voltage
t is the time
P is the power
Convert 20watts to kilowatts;
1000watts = 1kW
20watts = [tex]\frac{20}{1000}[/tex] = 0.02kW
Electrical energy = 0.02kW x 0.5hr = 0.01kWh
[tex]1000 \: watts = \: 1kW \\ 20 \: watts = \: \frac{20}{1000} \\
\: = 0.02kW \\
Electrical \: energy = 0.02kW x 0.5hr \\ = 0.01kWh[/tex]
Which process is diagrammed in the figure below?Which of the following facts about the ocean water indicates that the ocean is a major resource of nutrients?
Answer:
Upwelling
Explanation:
A molecule _____. is made of more than one atom is the same as a compound must be made of more than one element can only contain two atoms
Answer:
it is not an act answer but it has information
Explanation:
A molecule is defined as two or more atoms of the same element different element that are bound together. A molecule may be homonuclear, which means, it consists of atoms of one chemical element, as with oxygen (O2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H2O).
A molecule is made up of two or more atoms, and it can be composed of atoms of the same element or different elements.
A molecule is a particle that consists of two or more atoms chemically bonded together. It is the smallest unit of a compound that retains the chemical properties of that compound.
Molecules can be composed of atoms of the same element or different elements. When atoms of the same element combine to form a molecule, it is called a diatomic molecule.
On the other hand, molecules can also be formed when atoms of different elements combine. In this case, the molecule is considered a compound. Compounds are composed of two or more different elements chemically bonded together.
Hence, a molecule is made up of two or more atoms, and it can be composed of atoms of the same element or different elements.
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What do you think is the difference between HEAT & TEMPERATURE?
Answer:
"Heat describes the transfer of thermal energy between molecules within a system and is measured in Joules. Temperature describes the average kinetic energy of molecules within a material or system and is measured in Celsius"
Explanation:
The energy needed to remove an electron is called ionization energy.
Which of the statements are true of ionization energy and its trends found in the periodic table?
increases going down a column (top to bottom)
decreases going across a row (left to right)
increases going across a row (left to right)
decreases going down a column (top to bottom)
Answer:
im pretty sure its decreases going across a row (left to right)
Explanation:
As you move from left to right across a period on the periodic table the size of an atom will decrease
Hope this helps! Have a nice day!When writing a formula for a compound having a transition metal in it, _____.
it is sometimes necessary to use the Roman numeral as the assigned charge of the metal
it is sometimes necessary to include a Roman numeral after the symbol of the metal
it is always necessary to include a Roman numeral after the symbol of the metal
it is always necessary to use the Roman numeral as the assigned charge of the metal
-please explain
Answer:
it is always necessary to use the roman numeral as the assigned charge of the metal.
Explanation:
This is so that one would know which Transition metal is being used. For example copper (II) would be Cu²+
Write a balanced chemical equation for the reaction that occurs when Mg(s) reacts with Cl2(g).
Explanation:
When magnesium reacts with chlorine then it forms magnesium chloride.
Equation -
Mg + Cl₂ → MgCl₂
This is the example of Combination reaction.
what is Orthocoronavirinae?
Which type of heat transfer can cause the butter to melt?
A. Convection
B. Conduction
C. Radiation
D. Heat
Answer:
radiation
LOL but also heat
Explanation:
hope this helps
start out as one kind of rock, but large amounts of pressure and heat change them into a different kind.
Answer:
Metamorphic
Explanation:
Why do you think it might be useful to know the distance between a gun fired and its target? (Forensics)
Answer:
Yes, because in situations where an individual has been shot, it may be helpful for investigators to know how far away the shooter was from the victim. For example, in some cases a defendant accused of murderr may say that the shooting happened in self-defence. The actual distance between the two individuals may indicate whether the defendant is telling the truth. Similarly, knowing the approximate distance of a shot can help forensic scientists determine if a death was a suic ! de, or if it was a homic! de made to look like a suic! de.
Explanation:
sorry, brainly wont let me write out certain words
a solid sample of copper is an excellent conductor of electric current. which type of chemical bonds are in the sample ?
a.ionic bonds
b.metalic bonds
c.nonpolar bonds
d.polar bonds
Awnser
B. Metallic bonds
Explanation:
Castle Learning
Answer:
B) metallic bonds
Explanation:
Castle learning
Will GIVE BRAINLIST IF YOU ANSWER CORRECTLY Identity the type of reaction and balance the equation, including the states of matter, for the following reactions
(5 Points) aqueous aluminum nitrate is added to solid calcium
Type of Reaction: Double Displacement, Solid
Al(NO3)3 (aq) + Ca (s) → Al2Ca3 (s) + NO3 (aq)
(5 Points) aqueous barium chloride is added to aqueous potassium sulfate
Type of Reaction:
BaCl2(aq) + K2SO4(aq) → KCl (aq) + BaSO4 (s)
(5 Points) solid magnesium oxide is heated
Type of Reaction:
MgO (s) →
(5 Points) solid zinc is added to oxygen gas
Type of Reaction:
Zn (s) + O2(g) →
(5 Points) aqueous cobalt (II) chloride is added to solid magnesium filings
Type of Reaction:
CoCl2(aq) + Mg (s) →
(10 Points) Write a double replacement reaction where one of the products is copper (II) hydroxide. Include the states of matter for each of the reactants and products.
(10 Points) Write a decomposition reaction where the reactant is ammonium nitrate.
Include the states of matter for each of the reactants and products.
(10 Points) Write a synthesis reaction where one of the reactants is aluminum.
Include the states of matter for each of the reactants and products.
(5 Points) Give three indications that a chemical reaction has occurred.
Answer: i hope these help, lmk if they’re right.
Explanation:
pleaseee helpp
What is ONE way in which we monitor potential threats of flooding?
Question 3 options:
Satellite
Scuba Divers
SONAR
Seismometers
Question 4 (1 point)
The force that makes landslides so destructive is...
Question 4 options:
Weathering
Mountains
Wind
Gravity
Question 5 (1 point)
Coastal flooding occurs when
Question 5 options:
Rocks or debris block rivers causing them to overflow
Severe weather occurs causing large waves to hit the coast
Huge amounts of snow and ice melt due to sudden temperature variations
Colossal amounts of rain fall in a short period of time
Answer:
The first one is Satellite! Second one is Gravity! Third one is Severe weather occurs causing large waves to hit the coast!
Explanation:
I took the test~
Can somebody plz help answer both questions correctly thank you!!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :D
Answer:
answer #1 used throughout the world to power devices, appliances and methods of transportation utilized in daily life. To make things operate, electrical energy must be emitted from energy sources such as power plants, to enable an object to consume the power it needs to function. ((if you want to cut it down short use the two first sentences))
answer #2 We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar
Explanation:
The density of a substance having a mass of 9 x 10^5 g and a volume of 3 x 10^-1 cm3 is
Answer:
3,000,000 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{9 \times {10}^{5} }{3 \times {10}^{ - 1} } \\ [/tex]
We have the final answer as
3,000,000 g/cm³Hope this helps you
How many moles of MgO can be made from 5 moles of Mg?
2Mg + O2 -> 2MgO
Answer:
Explanation:
The expected product is MgO, so the 1-to-1 mole ratio Mg to O in the product is all that is required.
Two students are planning an investigation to determine if ionic or covalent bonds have stronger intermolecular. They are using salt (ionic), sugar (polar covalent), and moth balls (nonpolar covalent). Which one of the tests would not be relevant to their experiment?
Answer:
conductivity in water/ solid state
Explanation:
becuase, they both dissolve in water the same, therofre it is the least helpful.
The test that will be least helpful to determine if ionic or covalent bonds have stronger intermolecular is solubility in water. Therefore, option (B) is correct.
What is the covalent and ionic bond?The covalent bonds are formed by the shared pair of electrons between the atoms while the ionic bonds are formed by the complete transfer of electrons between the atoms. Methane is covalent while NaCl is an ionic compound.
Ionic compounds have strong intermolecular forces of attraction while covalent compounds don't. The covalent solids exhibit less melting point compared to the ionic compound.
Covalent compounds are generally more flammable than ionic solids. Salt conducts electricity in the water while sugar does not conduct electricity in the water.
As both students are trying to find the stronger intermolecular forces between ionic or covalent bonds, both salt and sugar are soluble in water. Therefore, the solubility in water would not be relevant to their experiment
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Your question is incomplete, but most probably the complete question was,
Two students are planning an investigation to determine if ionic or covalent bonds have stronger intermolecular. They are using salt (ionic), sugar (polar covalent), and moth balls (nonpolar covalent). Which one of the tests would not be relevant to their experiment?
(A) Flammability
(B) Solubility in water
(C) Conductivity in water
(D) Melting Point
Why are gamma rays not able to reflect off a mirrors surface
Answer:
the Ray's go right through it
Explanation:
the Ray's are so small they punch right through them
Answer:
Explanation:
The reason why is based in something called the plasma frequency of the metal of a mirror. A metal, as you may know, is composed of a series of atom (ion, effectively) cores - nuclei, together with some, but not all, of their bound electrons - which contribute the remaining outermost electrons of their unbound forms to a communally shared "electron sea" - kind of like a giant, distributed omnidirectional covalent bond that extends all throughout the whole metal crystal (here we're just considering a single crystal for simplicity). The electrons are quantumed out all over the full extent of the crystal and effectively form a sort of "gas" throughout and permeating the metal.
When an electromagnetic wave approaches that gas, the free charges within it - the electrons - start oscillating, and as they do so, they set up another wave going outward at the same time as the first is going in. This begins as soon as the first wave begins to impinge.
However, if the wave oscillation is fast enough, the electrons can't keep up due to their mass, and thus they are unable to form the reflected wave. The frequency at which this occurs is called the metal's plasma frequency (and is inversely proportional to the square root of the mass, so that a high mass particle would have a lower plasma frequency). The name comes from the fact that the metal can be thought of in a sense as a kind of "solid plasma" - ions with free electrons, the difference with what most people think of as a "plasma" being here the ions are not free to move about of their own accord.
What do you know about a chemical reaction if the value of H is positive?
pleaseee helpppp
A chemist measures the enthalpy change AH during the following reaction:
2 Na(s) + Cl2(9)-2 NaCl(s)
AH=-822. kJ
Use this information to complete the table below. Round each of your answers to the nearest kJ/mol.
What happens during a chemical reaction how do you know when a chemical reaction has occurred and how can you represent chemical reactions with equations??
We know that a chemical reaction has occurred by the appearance of a solid, evolution of a gas or change of color.
What is a chemical reaction?A chemical reaction refers to an interaction between reactants which leads to the formation of a product. A chemical reaction is represented using a chemical reaction equation.
We know that a chemical reaction has occurred when new substances appear in the system. This is signaled by the appearance of a solid, evolution of a gas or change of color.
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Some animals have an organ called the gizzard. The gizzard is muscular and helps to crush up hard food. Earthworms and many birds, including chickens, have gizzards. Chickens swallow small rocks that help the gizzard to grind up food. Did plant-eating dinosaurs have gizzards too? No one has found an actual dinosaur gizzard, but they have found small piles of round rocks inside dinosaurs’ ribcages.
Based on its function, the gizzard is part of the *blank*
system.
Answer:
digstive system
Explanation:
Mole ratio compares the subscripts of two compounds in a balanced reaction.
(1 Point)
TRUE
FALSE
Answer:
The correct option is FALSE
Explanation:
Mole ratio is the ratio of the number of moles of two compounds in a balanced chemical reaction. Number of moles of a compound in a chemical reaction is the number written before the compound.
For example, the mole ratio of Iron (Fe) and water (H₂O) in the equation below is 3:4
3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂
Thus, mole ratio does not compare subscripts of compounds.
Which one of these is NOT a sign of chemical change? *
Fire
Bubbles
Liquid
Light
Heat
Cold
Answer:
light
Explanation:
light is either from electricity or from the sun
What is required for two atoms to share electrons equally in a chemical bond?
A. The two atoms must have the same number of valence electrons.
B. The two atoms must have equal and opposite charges.
C. The two atoms must be of the same element.
D. The two atoms must both be nonmetals.
Answer:
C. the two atoms must be of the same element
The isotope 106 46Pd (106 on top and 46 on bottom)
has
1. 60 protons.
2. 106 neutrons.
3. 46 neutrons.
4. 60 neutrons.
Can I also have an explanation as well plz
Answer:
4. 60 neutrons.
Explanation:
The given isotopes;
¹⁰⁶₄₆Pd
In this isotope, we can deduce that the mass number is the superscript and the atomic number is the subscript;
Mass number = 106
Atomic number = 46
Mass number is the number of protons and neutrons in an atom;
Mass number = Protons + neutrons
Atomic number is the number of protons
So, Number of protons = 46
Number of neutrons = Mass number - Atomic number
= 106 - 46
= 60
Number of neutrons = 60