Answer:
73 days
Explanation:
From the question given above, the following data were obtained:
Half life (t½) = 18.2 day.
Original amount (N₀) = 0.70 g
Amount remaining (N) = 0.04375 g
Time (t) =.?
Next, we shall determine the rate of decay of the isotope. This can be obtained as follow:
Half life (t½) = 18.2 day.
Decay constant (K) =.?
K = 0.693 / t½
K = 0.693 / 18.2
K = 0.038 /day
Finally, we shall determine the time taken for the isotope to decay to 0.04375 g. This can be obtained as follow:
Original amount (N₀) = 0.70 g
Amount remaining (N) = 0.04375 g
Decay constant (K) = 0.038 /day
Time (t) =.?
Log(N₀/N) = kt /2.303
Log (0.70/0.04375) = (0.038 × t) /2.303
Log 16 = (0.038 × t) /2.303
1.2041 = (0.038 × t) /2.303
Cross multiply
1.2041 × 2.303 = 0.038 × t
Divide both side 0.038
t = (1.2041 × 2.303) / 0.038
t = 72.97 ≈ 73 days
Therefore, it will take approximately 73 days for the isotope to decay to 0.04375 g
How many significant figure are in the number 0.000850320
Answer:
6
Explanation:
the sig figs are 850320
Where are each part of the atoms located?
Answer: With the portion of hydrogen, all atoms have three parts. The parts of an atom are protons, electrons, and neutrons. A proton is accurately charged and is located in the center or nucleus of the atom. Electrons are negatively charged and are located in rings or orbits spinning around the nucleus.
Explanation: I hope this was helpful.
1 point
QUESTION 5: What happens if you reset and place the refrigerator instead
of the wooden box with an applied force fo 200 Newtons for about 3
seconds? *
O The speed of the skateboard increases compared to the wooden box
O The speed of the skateboard decreases compared to the wooden box
Answer: The speed of the skateboard decreases compared to the wooden box
Explanation: well, umm... if you placed a refrigerator on a skateboard... that will be difficult to move, if anything it will brake the board!
A wooden box is much lighter than a refrigerator
What is the density of a 805 g sample of pure silicon with a volume of 2.3 cm3?
If you know the volume and the density of an iron rod, how would you calculate the mass of that iron rod? Show a formula.
Answer: for an example
volume can easily be calculated: pi*(d^2/4)*length -> pi*[(7x10^-2)/4]*70x10–2 = volume of iron rod {VOIR}
Density = mass / volume
Therefore
Mass = density x volume
However, weight is equals to ‘mass x g (free fall acceleration’
So mass is in kg but weight is a force so simple force equation to where ‘a (acceleration)’ in ‘F=ma’ is ‘g’.
Hence,
Weight = 9.81 ms^-2 (is ‘g’) x 7870 kgm^-3 x VOIR m^3 is *insert calculated answer* N.
Explanation:
emelie is working on a science project. her task is to answer the question does rogooti a hair cream sold on tv affect the speed of hair growth in length her family is willing to volunteer for the experiment
Answer:
This question is incomplete and unclear; the complete question including the missing part is:
Emelie is working on a science project. Her task is to answer the question:
"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth
(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.
ANSWER:
Independent variable: Rogooti hair cream
Dependent variable: Speed of hair growth/length
Control group: Family members that do not use the Rogooti hair cream
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.
Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).
Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.
15. Which of the following is a correct statement?
O Nuclear power plants produce non-radioactive waste.
O Nuclear power plants utilize nuclear fusion.
O Fission utilizes the limited fuel source uranium.
O The waste products from a nuclear reactor are no longer radioactive.
Answer:
The answer is A
Explanation:
Nuclear power plants produce non-radioactive waste
Answer:
A
Explanation:
(earth science not chem!!) What branch of Earth Science deals with stars and galaxies beyond Earth?
Answer:
The answer is Astronomy.
Explanation: Astronomy is the study of objects beyond the Earth’s atmosphere
Which statement describes potential energy?
A energy of motion
B.stored energy
C energy due to heat
D. used energy
Answer:
B. stored energy
hope this helps!!
The atomic weight of iodine is less than the atomic weight of tellurium. However, Mendeleev listed iodine after tellurium in his original periodic table because he suspected the atomic weights for these elements were inaccurate. What was Mendeleev's reason for this suspicion?
Explanation :
As we know that Mendeleev arranged the elements in horizontal rows and vertical columns of a table in order of their increasing relative atomic weights.
He placed the elements with similar nature in the same group.
According to the question, the atomic weight of iodine is less than the atomic weight of tellurium. So according to this, iodine should be placed before tellurium in Mendeleev's tables. But Mendeleev placed iodine after tellurium in his original periodic table.
However, iodine has similar chemical properties to chlorine and bromine. So, in order to make iodine queue up with chlorine and bromine in his periodic table, Mendeleev exchanged the positions of iodine and tellurium.
As we know that the positions of iodine and tellurium were reversed in Mendeleev's table because iodine has one naturally occurring isotope that is iodine-127 and tellurium isotopes are tellurium-128 and tellurium-130.
Due to high relative abundance of tellurium isotopes gives tellurium the greater relative atomic mass.
Which is the jellylike substance within cells? plasma membrane DNA cytoplasm ribosomes
Answer:
Cytoplasm is the semi fluid gel like substance of a cell that is present within the cellular membranes and surrounds the nucleus.
Explanation:
Hope this helps :)
Answer:
cytoplasm is correct
Explanation:
i took the test
Cells with nuclei belong in the domain
Archaea
Bacteria
Eukarya
Protists
Answer:
Eukarya
Explanation:
if it has an nuclei its eukaryotic
Write the electron configuration for element 53. Use the noble gas notation.
Answer:
2,8,8,8,8,8,8,3
Explanation:
Electron Configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
What is a watt, which is a unit of power,equal to?
A joule divided by a meter
A joule times a meter
A joule times a second
A joule divided by a second
Answer:
A joule divided a second
Explanation:
i took the test
plz give me brainlist :)
Nitrogen-7 configuration
Explanation:
Electronic configuration of Nitrogen -
₇N = 1s² 2s² 2p³
first 30 elements with their atomic mass
A few important ones........
what type of compound is iron (3) oxide
Answer:
B Group Salt (Ionic Bond)
Explanation:
Iron (III) Oxide
Fe2O3
Answer:
Carbon Trioxide
Explanation:
Help Please : Will Mark Brainliest !!
you find a 2cmsquared piece of pure gold with a mass of 38.6 g. what is it's density?
Answer:
First change cm in m and mass is 38.6g. Volume. =200m
Explanation:
Now,
Density =mass /volume
38.6/200
0.193 density
Which describes an atom that has fewer neutrons than protons and more electrons than protons?
0negative compound
0positive compound
0positive ion
0negative ion
Answer:
Option d is correct = Negative ion
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
When an atom gain electron negative charge increase because of more number of electron thus atom form negative ion or anion. For example,
Anion formation:
X + e⁻ → X⁻
Cation formation:
X → X⁺ + e⁻
Thus option d is correct option.
What part of the sun do we see from earth?
Answer:
photosphere
Explanation:
photosphere
There are 3 main layers of the Sun that we can see. They are the photosphere, the chromosphere and the corona. Together they make up the "atmosphere" of the Sun. The part of the Sun that glows (and that we see with the naked eye) is called the photosphere
Answer:
There are 3 main layers of the Sun that we can see. They are the photosphere, the chromosphere and the corona. Together they make up the "atmosphere" of the Sun. The part of the Sun that glows (and that we see with the naked eye) is called the photosphere.
Explanation:
Yes, that's right a layer of the sun is called Corona
Coincidence, I think not
When water changes states from a liquid to gas , the water molecules move far apart . True or false? (6th grade science)
Answer:true
Explanation:
How do you convert 34.6 kilograms to micrograms?
Also the Steps that got you that answer
A car traveling at a constant speed of 75 miles/hr for 7.5 hours will go how far?
a
10 miles
562.5 miles
b
O.c
Od
751.5 miles
199 miles
Answer:
The answer is 562.5 milesExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × time
From the question we have
distance = 75 × 7.5
We have the final answer as
562.5 milesHope this helps you
Show all work: A metal bar has a length of 5.0 cm, a width of 3.0 cm, and a height of 1.0 cm. What volume of water, measured in deciliters, would this bar displace?
15 cm
and I have to explain but there's nothing to explain so yea
Gold atoms can be identified based on the number of which subatomic particles?
A. Protons
B. nuclei
C. electrons
D. neutrons
Answer:B
Explanation:
If the value of volume doubles but the mass stays
the same, the value for density will be
1.double
2.the same
3.halved
Answer:
halved
Explanation:
density decreases when volume increases if mass is kept constant density is defined as mass divided by volume.If the value of volume doubles, but the mass stays the same, the value for density will be halved. The correct option is 3.
What are volume, mass, and density?Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.
Mass is the quantity of matter in a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.
Volume is the space occupied by a three-dimensional object. Volume is calculated by dividing mass by density.
These three factors are related to each other. If two variables are given, the third can be calculated.
Thus, the correct option is 3. Halved.
To learn more about volume, mass, and density, refer to the link:
https://brainly.com/question/13799762
#SPJ2
A cubic object has a volume of 250 cm. What is its density if its mass is 5 points
257.3 g?
Answer:
The answer is 1.03 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 257.3 g
volume = 250 cm³
We have
[tex]density = \frac{257.3}{250} \\ = 1.0292[/tex]
We have the final answer as
1.03 g/cm³Hope this helps you
which character of Life distinguishes a fire and a flowering plant
Answer:
a flowering plant needs water while a fire doesn't.
That what I guessed???
which terms are used to identify pure substances
Answer:
Number 2:
Element and compound
