Answer:
Nucleus is the answer of your question
Answer:
nucleus is your awnser
PLZ DON"T JUST PICK AN ANSWER I REALLY NEED HELP
5. Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has passed?
A. 15 hours
B. 30 hours
C. 45 hours
D. 60 hours
Answer:
60 hours
Explanation:
18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g
15(4)= 60
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.
What is half life and decay law ?The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ
According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.
dtd N ∝ N
dtd N = λ N
where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.
Thus ,option D 60 hours is correct.
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What is a coordinate bond
Answer:
Explanation:
The coordination or coordinate bond, also known as a dative covalent bond or bipolar bond, is a covalent bond in which a pair of electrons shared by two atoms is contributed by only one of them. The atom that gives the pair of electrons is called the giver and the recipient, receiver.
Answer:
a type of covalent bond between two atoms in which the bonding electrons are supplied by one of the two atoms
Explanation:
Match the block to its correct density.
1 .
0.917 Kg/L
Block A
2 .
0.70 Kg/L
Block B
3 .
3.53 Kg/L
Block C
4 .
19.3 Kg/L
Block D
5 .
0.64 Kg/L
Block E
Answer:
Block A - 19.3
Block B - 0.64
Block C - 0.70
Block D - 0.917
Block E - 3.53
Hope this helps :)
Answer:
Block A - 19.3
Block B - 0.64
Block C - 0.70
Block D - 0.917
Block E - 3.53
Explanation:
12. t is the technique of revolutioary repackaged application thal enhances
the detail of an image on fabric using resistant dyeing
A Canling
B. Waxing
C. Moderm Baik
D. Traditional
Batik
Curiosity is important in the progress of science because it
A. aids in the interpretation of data.
B. encourages new experimentation.
C. ensures the inclusion of different viewpoints.
D. allows a scientist to learn from others.
Answer:
B
Explanation:
because it makes you want to know what happens in an experiment
Answer:
B. encourages new experimentation.
Explanation:
right on EDGE 2021
brainliest plz YW ppl
Is all matter the same?
Answer:
What is your body made of? Your first answer may be that it is made up of different organs like the heart, lungs, and stomach, which work together to keep it going. Or you could go even closer and say that it is made of many types of cells. However, at the most basic level, your body — and indeed, all life, like everything that is not alive — is made up of atoms, often organized into larger structures called molecules
Explanation:
Convert 20 cals to J
Answer: 83.68 J
Explanation:
1 cal=4.184 J
1×20=4.184×20
20cals=83.68 J
give an example how we use science in our every day life
Answer: When you turn a light on it becomes bright :)
In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.
According to Coulomb's law, what will happen to the electric force between
two identical negative charges as they move closer together?
A. F, will stay positive and increase in magnitude,
B. Fe will stay negative and increase in magnitude,
C. F, will become negative and decrease in magnitude
0
D. F will become positive and decrease in magnitude,
SUS
Answer:
A
Explanation:
Apex
PLEASE I NEED HELP ASAP
Answer:
Because the density of water is one
Using the enlarged metric ruler segment shown below, what is the length of the
blue line in centimeters?
Answer:
1.8 cm
Explanation:
To measure length, use a metric ruler. It is separated into centimeter-sized units. One centimeter is represented by each number on the ruler. The longest mark is the centimeter.
What is the enlarged metric ruler segment?A metric scale is used to quantify traits or variables. Interval scales, ratio scales, and absolute scales are all grouped under the phrase “metric scale.”
The majority of statistical calculations and comparisons are possible with quantitative numerical values.
To the nearest tenth of a centimeter (0.1 cm), a metric ruler, for instance, may measure length. Using a separate metric ruler, you can measure lengths to the nearest 0.05 centimeters (0.05 cm).
The measurement with the lowest degree of uncertainty (0.05 cm) is more accurate.
Therefore, 1.8 cm is the length of the blue line in centimeters.
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What Element am I?
I have 5 Valence Electrons.
I am in the 5th row.
My atomic mass is less than Bismuth *
с
Answer:
Nitrogen
Explanation:
Nitrogen has 5 Valence Electrons.
And its atomic mass is also less than Bismuth.
There are other elements in the 5th row but this one has the lowest atomic mass compared to the others.
Compared to gases liquids can be easily compressed. True or false?
Answer:
true
Explanation:
Answer: false, gases can be more easily compressed than liquids.
Explanation: They're easier to compress because there's much more empty space between the gas particles.
why is it that you can not feel earths movement but you can observes its effects
a) a rotates
b) earth revolves
c) earth only moves once a year
d) earth has gravity
Name two test substances that would react with each other to produce water and salt
Which statement describe global warming? Select 2 answer choices
Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere
What is the average acceleration from 0 seconds to 4 seconds
Answer:
1
Explanation:
you would take 4 subtract 0 which is 4 and divide it by 4 which is 1
Describe the way matter is measured
Answer:
in volume in weight and distibution
Explanation:
Which of the following is not part of a phospholipd?
A) galactose
B) fatty acid
C) phosphate
D) glycerol
Pls help due today
Answer:
A) Glycerol
Explana
Nitrogen (N) is element number 7 in the periodic table. It has a mass number of 14. Nitrogen
has gained 3 electrons. Nitrogen is a/an___.
a. Anion
bcation
c. Isotope
d. All of the above
what is the location of chlorine
Answer:
Chlorine can be found in abundance in both the Earth's crust and in ocean water. In the ocean, chlorine is found as part of the compound sodium chloride (NaCl), (table salt). In the Earth's crust, the most common minerals containing chlorine include halite (NaCl), carnallite, and sylvite (KCl).
Chlorine can be found in abundance in both the Earth's crust and in ocean water
Check out the PNG below!
Thank you to the person out there!
Answer:
4 Ethanol has a boiling point of 89 C at standard pressure.
Definition of periodic trends
Answer:
.Periodic trends are specific patterns in the properties of chemical elements that are revealed in the periodic table of elements. Major periodic trends include electronegativity, ionization energy, electron affinity, atomic radii, ionic radius, metallic character, and chemical reactivity.
Earth’s tides are affected by the gravitational pull of the Sun and the Moon, but mainly the Moon because the Moon is _______(1) Each day, each costal region on Earth experiences two high tides and two low tides in a ______(2) time period. This is because the gravitational attraction of the Moon creates ______(3) on two opposite sides of the planet. Two spring tides occur monthly, when the Moon is in its new and full phases. During these phases, the Moon and Sun are oriented ______________________,(4) which gravitationally pulls the water on Earth in the same direction, creating a large tidal range.
(1) A. closer
B. larger
C. denser
(2) A. 12-hour
B. 16-hour
C. 24-hour
(3) A. tidal bulges
B. moon phases
C. orbits
(4) A. in a straight line
B. at a right angle measuring 90 degrees
C. at an acute angle measuring 23 degrees
Answer:
1 closer
2 24hours
3 tidal bulges
4 in a straight line
Explanation:
Tides have been the effect of the sea with the gravitational pull of the sun and moon.
1. Earth’s tides are affected by the gravitational pull of the Sun and the Moon, but mainly the Moon because the Moon is closer to the earth.
In spite of high pull of the Sun, the distance of moon from earth results in increased effect of moon gravitational pull than Sun.
2. Each day, each coastal region on Earth experiences two high tides and two low tides in every 24 hours time period.
The daily tides has been resulted at the coast with the moon revolution around the earth's rotation.
3. This is because the gravitational attraction of the Moon creates tidal bulges on two opposite sides of the planet.
The effect of the moon gravitational force results in the bulging or the pulling force to the sea, resulting in the diurnal tides.
4. Two spring tides occur monthly, when the Moon is in its new and full phases. During these phases, the Moon and Sun are oriented at a right angle measuring 90 degrees which gravitation pulls the water on Earth in the same direction, creating a large tidal range.
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Is this isotope stable or radioactive?
Answer:
radioactive
Explanation:
becasue i said so. Periodt
Answer:
An unstable isotope emits some kind of radiation, that is it is radioactive.
Explanation:
evaporation
the process in which a solid changes directly into a gas (the term is
sometimes also used for the reverse process)*
CO
1
Chapter 3 Section 2
What is the material being extruded by Mount Mayon? Where do you think did this material come from?
The material being extruded by Mount Mayon is "Lava".
Throughout view of such increasingly prevalent eruption occurrences, the water level of the wells drilled in nearby crater Mount Mayon, this same present volcano together in dynamic condition, is beginning to decrease.The episodes have been characterized by a resilient oozing but also welling of lava, frantic ejection of blocks as large as vehicles, and angered release of thick ashes and sedimentary sprinkles up to a few 100 kilometers over the crater lip.
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Use the diagram to select the one true statement about the
rock layers
Use the following diagram to answer questions 3-6.
A. A occured after D
B. C is younger that B
C. C occured before D
D. A is older than B
Answer:
a is occured after d i think
Which process most likely takes place when the kinetic energy of molecules overcomes the intermolecular forces?
boiling
condensation
freezing
solidification
Answer:
Explanation:
boiling
According to the forces of attraction, boiling takes place when the kinetic energy of molecules overcomes the intermolecular forces.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Why do isotopes of the same element have the same atomic size?
Answer:
Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). Isotopes of a given element contain different numbers of neutrons, therefore, different isotopes have different mass numbers.
The atomic size of an element significantly depends on the number of protons. It is the characteristic property of isotopes that they possess the same number of protons which is responsible for the same atomic size.
What are Isotopes?Isotopes may be defined as one of two or more species of atoms of a chemical element that have the same atomic number and location in the modern periodic table with identical chemical behavior but with different atomic masses and physical properties.
In a more simple sense, isotopes are those elements that have the same atomic number but different atomic mass. The atomic number depends on the number of protons which remains constant in isotopes. So, the isotopic elements have identical atomic sizes.
Therefore, the isotopes of the same element have the same atomic size.
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