Answer:7.72 years
Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay.
Explanation:
0.01 = 67.0 ×[tex](\frac{1}{2}) ^{\frac{98.0} {1/2 } }[/tex] [tex]\frac{0.01}{67.0}[/tex] = 0.000149=[tex](\frac{1}{2}) ^{\frac{98.0} {1/2 } }[/tex]
[tex]^{\frac{98.0} {1/2 } }[/tex] =log[tex]_{0.5}[/tex] (0.000149)=12.7
[tex]^{\frac{98.0} {1/2 } }[/tex]=7.72 years
Hope this helps have a great day/afternoon :)
A hypothesis is ______ to explain a set of observations.
1 one possible way
2 the correct method
3 a factual statement
4 a set of data
Answer:
1
Explanation:
one possible way its just a theory of what the answer could be
Answer:
3-a factual statement
Explanation:
A hypothesis is a factual statement to explain a set of observations.
how much electrons are present in MnO4-
(PLS HELP will mark brainliest!) Compare and contrast the alkali metals and the alkaline earth metals. Discuss their physical and chemical properties, their magnetic properties, and their electron configurations.
Answer:
I have a picture from my excerpt that basically answers all of that!
Hope it helps!
Explanation:
The attachment
The alkali metals and alkaline earth metals has different physical and chemical properties due to difference in their valence electrons.
Comparison of physical and chemical properties of alkali metals and the alkaline earth metals. Alkali Metals Alkaline earth metals·Electronic [Noble gas]ns1 [Noble gas]ns2
configuration
·Reactivity Comparatively more reactive Comparatively less
reactive
·Hardness Soft and can be cut by sharp Comparatively harder
knife
·Valency One valence electron Two valence electron
·Ionic charge +1 +2
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describe the relationship between the mass volume and density of material
Answer: For a given mass and volume, how much physical space a material takes up, of an object or substance, the density remains constant at a given temperature and pressure. The equation for this relationship is ρ = m / V in which ρ (rho) is density, m is mass and V is volume, making the density unit kg/m3.
Explanation:
calculate the atomic mass of carbon if the two common isotopes of carbon have masses of 12.000 amu (98.89% abundance) and 13.003 amu (1.11% abundance)
12.01 amu
Work:
(12.000 × .9889) + (13.003 × .0111) = 12.01
turn the precents into decimals1. Which family of elements is most likely to lose electrons?
2. Which family of elements is most likely to gain electrons?
Answer:
Elements that are metals tend to lose electrons and become positively charged ions called cations.
Elements that are nonmetals tend to gain electrons and become negatively charged ions called anions.
Hope it helps:)
Metal are the family of elements which is most likely to lose electrons. Non metals are the family of elements which is most likely to gain electrons.
What is element?The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
118 known elements are present. A study is being done to create element 120.1. The periodic table will have to be modified to include element 120 after it has been created and validated. Metal are the family of elements which is most likely to lose electrons.
Therefore, metal are the family of elements which is most likely to lose electrons.
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What is the volume of a box that has a length of 5 cm a width of 7 cm and a height of 9 cm
Answer:
V = L × w × h
V = 5 × 7 × 9
V = 315 cm³
Which of these would have particles with the highest kinetic energy?
ice
water
water vapor
Answer:
water vapor
Explanation:
because gas molecules moves the fastest
Answer:
water vapor
Explanation:
Liquid water molecules have less freedom to move around. While molecules of water vapour have more freedom to move around as there is larger space between the molecules. Hence, the kinetic energy of water molecules is more as compared to the kinetic energy of liquid water
Help please I’ll make you as brainlister 3
Answer:
It doesn't look like any of them but the best answer is SI
Explanation:
What does a subscript indicate in a chemical formula?
A. The number of atoms of that element in the molecule
B. The number of bonds that element forms in the molecule
C. The position in the molecule that element occupies
D. The atomic number of the element in the molecule
Answer:
The number of atoms of that element in the molecule
Explanation:
You're welcome
the human eye has three types of cones cells. damage to any one of the types of cone cells doesn't cause total blindness because of the
A. presence of rod cells
B. other two functional Cone cells
C. presence of optic nerves
they have rod cells - this helps them be able to see colors through a spectrrum located in the retina
Why does a planet stay in orbit?
Answer:
Gravity
Explanation:
A planet is gravitationally pulled around the sun.
Answer:
beause of gravitys pull and because the atmosphere of the beyond lol also bcs this i hope this helps your welcome boo >3
Explanation:
Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
How many moles (of molecules or formula units) are in each sample?
A) 32.66 g CF2Cl2
B) 24.2 kg Fe (NO3) 2
C) 0.5912 g C8H18
D) 104 kg CaO
Express all answers to 4 sig figs
Answer:
A = 1.627 ×10²³ molecules of CF₂Cl₂.
B = 809.4 ×10²³ molecules of Fe(NO₃)₂.
C = 0.03117 ×10²³ molecules of C₈H₁₈.
D= 1116 ×10²³ molecules of CaO.
Explanation:
A)
Given data:
Mass of CF₂Cl₂ = 32.66 g
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 32.66 g/ 120.9 g/mol
Number of moles = 0.2701 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
0.2701 mol×6.022×10²³ molecules / 1mol = 1.627 ×10²³ molecules of CF₂Cl₂.
B) Given data:
Mass of Fe(NO₃)₂ = 24.2 Kg (24.2×1000 = 24200 g)
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 24200 g/ 180 g/mol
Number of moles = 134.4 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
134.4 mol×6.022×10²³ molecules / 1mol =809.4 ×10²³ molecules of Fe(NO₃)₂.
C) Given data:
Mass of C₈H₁₈= 0.5912 g
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 0.5912 g/ 114.22 g/mol
Number of moles = 0.005176 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
0.005176 mol×6.022×10²³ molecules / 1mol =0.03117 ×10²³ molecules of C₈H₁₈.
D) Given data:
Mass of CaO = 104 Kg (104×1000 = 104,000 g)
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 104,000 g/ 56.1 g/mol
Number of moles = 1854 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
1854 mol×6.022×10²³ molecules / 1mol = 1116 ×10²³ molecules of CaO.
Explain how the mid-ocean ridge supports
the theory of sea floor spreading.
help plzzz:(
7. Electrons that are free to move in a metal are referred to as ________ electrons.
A.magnetic
B.valence
C.electrostatic
D.cation
Answer:
D; Cation
They are the valence electrons that can move between two metal molecules.
Convert 0.0134 Liter to millimeter
Answer:
13400 millimeters.
Explanation:
Multiply the volume value by 1e+6
Find the area of a rectangle with a length of 10cm and a width of 7cm.
A.70cm
B.17 cm
C.17cm2
D.70cm2
Answer:
D
Explanation:
You would do 10*7 witch would be 70 then cm2 so the answer is 70cm2
1. In part 1, you collected data about how the amount of sugar affects the amount of gas produced. Analyze those data and draw a conclusion. (16 points) a. What gas inflated the balloons? (2 points)
Answer:
carbohydrate is an essential biomolecule so the affect of suger fluctuates when enzyme consumes the substrates of glucose molecules
Political considerations played a great role in the decision for the United States to enter the Space
Race.
True
False
True
The Cold War & tensions with Russia led to the great Space Race. Getting into space was a goal of the US as well as Russia and whomever got into space would be considered superior in the world's perspective
Does temperature have the same effect on gases as it does on liquids when it comes to viscosity? Explain.
When the temperature of a liquid (fluid) decreases, its viscosity increases. What happens to this fluid?
As the temperature of a liquid (fluid) increases, its viscosity decreases. What happens to this fluid?
Why does ketchup flow faster when heated?
Answer: Explanation:
With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. ... With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.
liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
If a boulder sits at rest on top of a mountain what conclusion can be made about the forces acting on the
A boulder sits at rest on top of a mountain. What conclusion can be made about the forces acting on the boulder? The forces acting on the boulder are balanced (net force equals zero).
If a boulder sits at rest on the top of the mountain , the forces acting on the boulder are zero as it is in the state of rest.
What is a force?
Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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What is the charge of protons?
Answer:
protons naturally have the charge of +1
Answer:Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms
Explanation:
The electronic structure of the atom X is : 2, 8, 1
A. In which group atom x is found:—————-
B. In which period atom x is found:—————
C. What is the name of atom x:———————-
Answer:
A. grou(I)
B. 3rd period
C. Sodium (Na)
Explanation:
it belongs to group (I) since it has one valence electron
it belongs to 3rd period since it has three energy levels
What would pressure be if volume was 0
Answer:
The lower the temperature, the lower the pressure inside of the sphere. If the exact values were plotted out, a linear relationship would be apparent. Extrapolating this line to the point where there would be no pressure yields absolute zero, which is about -273.15 degrees Celsius.
Explanation:
how many grams of oxygen gas are produced when this sample is heated?
Answer: 2.92%
Explanation:
Liquids will boil at a higher temperature when they are at a lower elevation true or false ?
When Silver (Ag) forms a metallic bond with other Silver atoms, what do the valence electrons move into? A. the all go to the same Silver atom B. the bond with the oxygen in the atomsphere C. they escape to free space D. the sea of electrons
Answer:
D. the sea of electrons
Explanation:
Metallic bonds are defined as the bonds formed between two or more metals. Silver atom form metallic bond with other silver atoms.
In metallic bond, the free electrons or valence electrons present in s and p orbitals delocalize. The valence electrons do not move around the atoms or enter the atoms whereas they form a sea of electrons in which they surround the nuclei (positively charged) of the metal ions interacting. The valence electrons are then freely move in the space between the atomic nuclei.
Hence, the correct answer is "D. the sea of electrons".
what happens to the pen?what could have caused the pen's motion?
grade 8 asap
Answer:
One is tension force that acts on the string and the other one is gravitational force that is acting on the pen and is therefore, the one that pulls the pen towards the ground. Therefore, the pen's motion is caused by the unbalanced force acting on the pen.
Which of the following is NOT an example of a homogeneous mixture? a oxygen b tea c water d pizza
In this simulation, you will be exploring the relationship between temperature and pressure while keeping volume
constant. Click here to begin. Select the Explore box. Answer the questions as you perform the steps.
1. Raise and push down the pressure pump handle to add gas molecules to the container. The initial temperature is
300 K (27º) and the pressure has a range of 5.4-6.2 atm. Notice the pressure values change as the particles
collide with the wall.
2. Click on the bucket to raise the temperature of the container to approximately 400 K (127°C). What happened to
the pressure?
Approximately what pressure range did you observe?
3. Click on the bucket to reduce the temperature to approximately 200 K (-73°C). What happened to the pressure?
Approximately what pressure did you observe?
4. What gas law mathematically shows the relationships between temperature and pressure?
Answer:
increased, 7.5-8.3 atm; decreased, 3.5-4.3 atm; Gay-Lussac's Law
Explanation:
1. The collision of gas molecules, results in the pressure increases.
2. The pressure of the system with an increase in the temperature has been 7.2-8.2 atm.
3. The pressure of the system with a decrease in the temperature has been 3.6-4.1 atm.
4. The relationship between the molecules has been given by Gay-Lussac's Law.
The relationship between the temperature and pressure has been given in the gaseous molecules with the ideal gas equation.
1. The temperature has been directly proportional to the temperature. Thus, with an increase in pressure, there has been an increase in temperature and vice versa.
With the collision of the gas molecules with the wall, there has been the liberation of the energy that increases the temperature. The increase in temperature mediates the increase in pressure.
Thus, with the collision of gas molecules, the pressure increases.
2. The relationship between the pressure and temperature has been given as:
[tex]\dfrac{P1}{T1}=\dfrac{P2}{T2}[/tex]
The initial temperature [tex]T1=300\;\text K[/tex]
Final temperature [tex]T2=400\;\text K[/tex]
Initial pressure, [tex]P1=5.4-6.2\;\text {atm}[/tex]
Final pressure, [tex]P2[/tex]
Substituting the values for calculating P2 as:
[tex]\rm \dfrac{5.4-6.2\;atm}{300\;K}=\dfrac{P2}{400\;K}\\\\\textit P2 = \dfrac{5.4-6.2\;atm}{300\;K}\;\times\;400\;K\\\\\textit{P}2=7.2-8.2\;atm[/tex]
The pressure of the system with an increase in the temperature has been 7.2-8.2 atm.
3. The pressure with the reduction of temperature has been given by :
[tex]\dfrac{P1}{T1}=\dfrac{P2}{T2}[/tex]
The initial temperature [tex]T1=400\;\text K[/tex]
Final temperature [tex]T2=200\;\text K[/tex]
Initial pressure, [tex]P1=7.2-8.2\;\text {atm}[/tex]
Final pressure, [tex]P2[/tex]
Substituting the values for calculating P2 as:
[tex]\rm \dfrac{7.2-8.2\;atm}{400\;K}=\dfrac{P2}{200\;K}\\\\\textit P2 = \dfrac{7.2-8.2\;atm}{400\;K}\;\times\;200\;K\\\\\textit{P}2=3.6-4.1\;atm[/tex]
The pressure of the system with a decrease in the temperature has been 3.6-4.1 atm.
4. The relationship between the molecules has been given by Gay-Lussac's Law. The law states that pressure has been directly proportional to the absolute temperature of the system.
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