Answer: a
Explanation:
i hope is help
Element Q has three isotopes. It is 18.75% -318, 78.26% Q-319, and 2.99% Q-320; The masses of the isotopes are 317.98 amu, 318.98 amu, and 320.026 amu respectively. What is the average atomic mass of the element Q
Answer:
Explanation:
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A bank roll of 40 coins weighs approximately 0.313 kg. What is the mass in grams of a single coin?
Answer: .007825
Explanation:
.313 / 40 = .007825
How many years ago and where did scientists figure out how the Earth was made?
Answer:
Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) and was largely completed within 10–20 million years. The solar wind of the newly formed T Tauri star cleared out most of the material in the disk that had not already condensed into larger bodies
Explanation:
Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) and was largely completed within 10–20 million years. The solar wind of the newly formed T Tauri star cleared out most of the material in the disk that had not already condensed into larger bodies
Answer:
More than 70 meteorites that have fallen to Earth have had their ages calculated by radiometric dating. The oldest of these are between 4.4 billion and 4.5 billion years old. Fifty thousand years ago, a rock hurled down from space to form Meteor Crater in Arizona.Scientists now think the Earth's story began around 4.6 billion years ago in a disk-shaped cloud of dust and gas rotating around the early sun, made up of material left behind after the sun's formation.
Explanation:
Earth is estimated to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth searching for the oldest rocks to radiometrically date. In northwestern Canada, they discovered rocks about 4.03 billion years old.By measuring the age of rocks on the moon, and meteorites found on Earth, scientists estimate the Earth consolidated by 4.54 billion years ago.Formation. When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle, and a solid crust.
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Mass, Density, and Volume- Word Problems
1. What volume in liters would be occupied by 0.22777kg of a material with a density of 0.00523kg/mL?
2. What is the density of a substance in mg/mL, if a sample with a volume of 1.91cm^3 has a mass of 0.00588kg?
Taking into account the definition of density, you have:
the volume will be 0.04355 L.the density of the substance is 3,078.534 mg/mL.Definition of densityDensity is defined as the property that matter has to compress into a given space. That is, density is a quantity that is defined as the amount of mass in a given volume of a substance.
The expression for calculating density is the ratio between the mass of a body and the volume it occupies:
density= mass÷ volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Volume in this caseIn this case, you know that:
Density= 0.00523 kg/mLMass= 0.22777 kgReplacing in the definition of density:
0.00523 kg/mL= 0.22777 kg÷ volume
Solving:
0.00523 kg/mL× volume= 0.22777 kg
volume= 0.22777 kg÷ 0.00523 kg/mL
volume= 43.55 mL= 0.04355 L (being 1000 mL= 1 L)
Finally, the volume will be 0.04355 L.
Density of a substanceIn this case, you know that:
Mass= 0.00588 kg= 5880 mg(being 1 kg= 1,000,000 mg)Volume= 1.91 cm³= 1.91 mL (being 1 cm³= 1 mL)Replacing in the definition of density:
density= 5880 mg÷ 1.91 mL
Solving:
density= 3,078.534 mg/mL
Finally, the density of the substance is 3,078.534 mg/mL.
SummaryIn summary, you have:
the volume will be 0.04355 L.the density of the substance is 3,078.534 mg/mL.Learn more about density:
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(Each helium atom has two protons. Sketch models
of helium-3 and helium-4, which have approximate masses of 3 amu and 4 amu, respectively. Label and differentiate protons, neutrons, and
electrons in your models.
In the isotopes of Helium, Helium-3 has 2 electrons, 2 protons and 1 neutron whereas Helium-4 has 2 electron, 2 protons and 2 neutrons in it.
Isotopes are the atoms of same element having same atomic number but different mass number.
Mass number is represented as Z and atomic number is represented as A.
Atomic number = number of protons in the atom = number of electrons in the neutral state of the atom.
Mass number = number of protons + number of neutrons in the atom
so, number of neutrons can be calculated as = Atomic number - number of protons in it
For Helium-3
mass number = 3
and atomic number = 2
so number of electrons = number of protons = atomic number = 2
number of neutrons = mass number - number of protons
= 3-2 = 1
For Helium-4
mass number = 4
and atomic number = 2
so number of electrons =number of protons = 2
number of neutrons = mass number - number of protons = 4-2 = 2
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what do these two changes have in common?
Erosion caused by wind
beating an egg
The Erosion caused by wind and beating an egg both the changes are physical change.
What is erosion?Erosion is defined as a geographical process in which earthen material will blow away and caused by a natural force such as wind or water.
There are mainly four types of erosion
Splash erosionSheet erosionRill erosionGully erosionPhysical change can be defined as a type of change where only the physical properties of the matter changes.
Thus, the Erosion caused by wind and beating an egg both the changes are physical change.
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An iron refinery produces an iron ingot weighing 150.0 lb. (An ingot is a piece of relatively pure metal that is cast in a block.) If the iron is drawn into wire whose diameter is 7.50 mm, how many feet of iron can be obtained from the ingot? The density of iron is 7.87 g/mL. The cost of iron is $109 per metric ton. How much is this wire worth?
Write a balanced chemical equation based on the following description:
gaseous nitrogen and hydrogen react to form gaseous ammonia
The balanced chemical equation of a reaction between gaseous nitrogen and hydrogen to form gaseous ammonia is as follows; N₂ + 3H₂ → 2NH₃.
What is a balanced chemical equation?A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
A chemical reaction is said to be balanced, in accordance with the law of conservation of matter, when the number of moles of each atom of elements on both sides of the equation are the same.
According to this question, gaseous nitrogen and hydrogen react to form gaseous ammonia. The balanced chemical equation is as follows:
N₂ + 3H₂ → 2NH₃
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write down any two effect of heat.
Answer:
1) Raises the temperature. 2) Increases volume.
Monosodium glutamate is used to enhance the flavor of foods, it has the following composition: 13.6% Na; 35.5% C; 4.8% H; 8.3% N and 37.8% O, by mass.
What is the empirical formula of monosodium glutamate?
R= NaC5H8NO4
Answer:
Assume you have 1g of your sample.
Then 13.6% of this sample is Na, that is 0.136g.
Since you are to find the empirical formula, you need to find the number of moles of Na in 0.136g. You can do that by dividing by the atomic mass of Na: n(Na)=0.136g / 23.0 g/mol = 0.00591 mol
Next, you repeat this for all the other elements.
The last step is to pick the smallest number of moles that you get and divide the others by it. That way you should arrive at whole number coefficients for the empirical formula. The element with the smallest number of moles gets 1 as its coefficient).
Use the chemical reaction to answer the question.
NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about the reaction is correct?
--------------------------------------------------------------------------------------------------------------------
A. The atoms of the reactants are regrouped during the reaction.
B. Atoms of Na are destroyed during the reaction.
C. There are more H atoms after the reaction.
D.Some atoms gain mass after the reaction.
Answer:
the awnster is A
Explanation:
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Compare and contrast a scientific theory and a scientific law, and include an example of each.
Answer:
scientific is a study of things and scientific law is law
Explanation:
you can study scientific a ND and law
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Answer:
Scientific theories and laws are both factual. However, scientific theories are statements that have been proven over and over again by dozens of scientists. For example, a theory would be that the solar system is heliocentric (planets revolve around the sun). Theories are also subject to change in the event of new technological innovations. Scientific laws are statements that are universal and are based on logic/math. These will not change because they describe what happens and they are rules. For example, Newton's laws of motion would be laws because they are rules of motion. Overall, scientific theories and laws describe why and what happens based on certain conditions and circumstances.
A fungicide dissolved in water was applied to the soil in which a rose plant was growing. It later appeared in the leaves. How did the fungicide reach the leaves?
The fungicide reaches to the leaves through the xylem's transpiration pull.
1. The fungicides are the chemicals which are used to removes fungus which on the plants and also stops the growth of fungus present on plants.
2. The fungicides are dissolved in water to make the dilute solution so that when it sprayed on the leaves, it easily absorbed by the soil.
3. The plants have special mechanism which helps in absorption of all the minerals that are present in the soil.
4. The xylem absorb mineral and water in the soil and phloem absorbs nutrients from the soil. Xylem pull ups the solution against the gravity and moves this solution to the surface of the leaves is called transpiration pull.
5. There are 3 mechanism that involved in the movement of fungicide are• Root pressure • Cohesive force • Capillary action
6. All these forces are worked to pull up the solution upward to the leaves.
Thus the xylem is a specialized mechanism present in the plants to pull up the solution upward against the gravity.
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During a UV-Visible spectroscopy experiment, a student notes a wavelength peak measurement at 280 nm. What region of the electromagnetic spectrum was this peak observed?
If during a spectroscopy experiment a student notes a wavelength peak measurement at 280 nm, then the region of the electromagnetic spectrum observed is the UV region.
What is the electromagnetic spectrum?The electromagnetic spectrum refers to all types of wavelengths that radiation can emit as light, which involves both visible light and also ultraviolet (UV) radiation.
In conclusion, if during a spectroscopy experiment a student notes a wavelength peak measurement at 280 nm, the region of the electromagnetic spectrum observed is the UV region.
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What is 254 nm in meters? Submit answer in scientific notation using the format 0.00x10^0 (e.g. 0.000123 = 1.23x10^-4). Omit units and spaces.
What is the frequency of this irradiation? (Answer from question 1) Submit answer in scientific notation using the format 0.00 x 10^0 (e.g. 0.000123 = 1.23 x 10^-4). Omit units and spaces.
Nanometers is an SI subunit of length equal to 10-⁹ metres. It has a symbol of nm.
The conversion factor of metres to nanometers is as follows:
1 nanometres = 1 × 10-⁹ metres
Hence, 254 nanometers is equivalent to 2.54 × 10-⁷metres.
The frequency of a wave can be calculated using the following formula:
wavelength = wave velocity/frequency
frequency = 3 × 10⁸ ÷ 2.54 × 10-⁷
Frequency = 1.18 × 10¹⁵Hz
Therefore;
254nm is equivalent to 2.54 × 10-⁷metres. The frequency of a radiation that has a wavelength of 254nm is 1.18 × 10¹⁵HzLearn more about frequency and wavelength at: https://brainly.com/question/3639648
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Perform the calculation and record the answer with the correct number of sig figs
Answer:
0.399
Explanation:
Sig Fig rules
The Minnesota Study is an example of the
The Minnesota Study is an example of the twins study
The Minnesota twin study of adult development began in 1986 to identify what causes individual differences in aging and study of identical (MZ) and fraternal (DZ) twins allows for estimation of how genes and environment affect the aging process and monozygotic or identical twins because they shared 100% of their inherited genes. Therefore, the researchers assumed that any differences between identical twins raised apart would be due to environment and similarities between identical twins raised apart would be due to genetics and this study proves that allow disentanglement of the shared genetic and environmental factors for the trait of interest.
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a cube of iron pyrite is 0.31 cm on each side and has a mass of 0.040g. what is the density of the sample?
The density of the iron pyrite cube is 1.343 g/cm³.
Given,
Side of iron pyrite cube = 0.31 cm
Mass of iron pyrite = 0.040 g
The volume of iron pyrite cube = s³ cm³
Or, volume = 0.029791 cm³
We have to find the density of the sample.
Density is defined as the mass per unit volume. Or, it is the ratio of mass to the volume of the substance.
Using the formula for density, we get,
Density = mass/volume
Or, density = 0.40/0.029791
Or, density = 1.343 g/cm³
Hence, the density of the iron pyrite cube is 1.343 g/cm³.
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a stick of butter weighs 0.25lbs. what is the weight of the stick of butter in milligrams?
A stick of butter weighs 0.25lbs. The weight of the stick of butter in milligrams is 113398.1.
What are milligrams?Milligrams are the measurement quantity that is used to measure a substance in very minute quantities. It is the SI unit of mass. It is equivalent to one thousand grams.
lb is the symbol of a pound. It is used to measure an object in American and British systems of measurement. It is a value of weight.
1 lb = 453592 milligrams
0.25 lbs = 113398.1 milligrams
Therefore, the weight of the stick of butter in milligrams is 113398.1.
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A piece of metal has a mass of 114g and a volume of 10.0 cm³. What is the density of the metal?
Answer:
14.4g/cm³
Explanation:
114/10=14.4g/cm³
A tortoise moves at a speed of 454 cm/min. How fast is the tortoise in mph?
Hint: there are 5280 feet in 1 mile
A) 0.17 mph
B) 0.34 mph
C) 17 mph
D) 0.0017 mph
Answer:
AWhat mass in grams of CH₃OH (MM = 32.04 g/mol) would need to be added to 380.1 g of water in order to lower the freezing point of water by 12.0 °C? (Kf for water is 1.86 °C/m)
Mass in grams of CH₃OH would need to be added to 380.1 g of water in order to lower the freezing point of water by 12.0 °C is 78.53 g .
The depression in freezing point is given as :
ΔT = i × K × m
given that :
molar mass of CH₃OH = 32.04 g/mol
volume of water = 380.1 g = 0.3801 kg
change in freezing point = 12 °C
K = 1.86 °C/m
i = 1 (CH₃OH does not dissociate in water , so i =1 )
putting all the values :
m = 12 / 1 ×1.86
m = 6.45 m
now, molality = moles of solute / solvent in kg
6.45 moles/kg = moles / 0.3801 kg
moles of solute = 2.451 moles
therefore,
mass = moles × molar mass
mass = 2.451 moles × 32.04 g/mol
= 78.53 g CH₃OH is needed
Thus , Mass in grams of CH₃OH would need to be added to 380.1 g of water in order to lower the freezing point of water by 12.0 °C is 78.53 g .
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A certain protein was found to contain 0.793% zinc by mass. Determine the minimum molecular mass of the protein.
A certain protein was found to contain 0.793% zinc by mass. The minimum molecular mass of the protein is 8264.46 grams.
What is molecular mass?Molecular mass is the sum of the all atoms of an element. The molecular mass can be calculated by checking the mass of the atom from the periodic table.
In 100 grams of proteins, we have, 0.793% zinc
The molar mass of zinc is 65.3820 g/mol
0.793 / 65.3820 = 0.0121 moles of zinc
So, in 100 grams of protein
1 mole = 100 / 0.0121 = 8264.46 grams / mol
Thus, the minimum molecular mass of the protein is 8264.46 grams.
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A nurse administered 2.70 mL of a radioisotope solution that has an activity of 105 μCi/mL . What total dose of the radioisotope did the patient receive?
Answer:
283.5 of radioisotopes. Each mL has 105 micrograms, so multiply 105 x 2.70.
Which safety equipment is needed when working with materials that car
spatter?
Answer: Required personnel protection equipment (PPE) must be worn at all times
Explanation:
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Name an element in the second period (row) of the periodic table with six 2p electrons
Answer:
arsenic
Explanation:
So basically it can be seen that the element is arsenic. Yeah. And now we see the element which has 6, 2 p electrons and lies in the 2nd period. So that is basically now because if we observe the electronic configuration of now it has atomic number 10 and its electronic configuration is one has to to s to two P six.
How many Rh atoms would have to be placed side by side to span a distance of 6.0 um?
22202 are the number of atoms to be placed side by side to span a distance of 6.0um.
What are atoms?The smallest unit of substance into which it is possible to divide without releasing electrically charged particles is the atom.
In addition, it is the smallest unit of matter with chemical element-like characteristics. The atom is thus the fundamental component of chemistry.
An atom of Rhodium (Rh) diameter d = 2.7x[tex]10^{-10}[/tex] m.
Now assuming that keeping n atoms side by side , the distance will be L= 6um = 6.5 x [tex]10^{-6}[/tex] m.
Now, the total length is given by total sum of diameter,
so the equation is given by,
L= nd
n= [tex]\frac{L}{d}[/tex]
n= [tex]\frac{6.0x 10^{-6} m}{2.7x10^{10} } m[/tex]
n= 22202 atoms.
Hence, there are total 22202 Rh atoms have to be placed side by side to span a distance.
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What is the frequency of this irradiation? (2.54x10^-7) Submit answer in scientific notation using the format 0.00 x 10^0 (e.g. 0.000123 = 1.23 x 10^-4). Omit units and spaces.
The frequency of an irradiation with wavelength of 2.54 × 10-⁷ metres is 1.18 × 10¹⁵ Hz.
How to calculate frequency?The frequency of a radiation is the rate of occurrence of anything i.e. the relationship between incidence and time period.
The frequency of a wave can be calculated using the following formula;
λ = v/f
Where;
λ = wavelengthv = speed of lightf = frequencyAccording to this question, an irradiation with wavelength of 2.54 × 10-⁷ metres is given. The frequency can be calculated as follows;
2.54 × 10-⁷ metres × f = 3 × 10⁸ metres/seconds
f = 3 × 10⁸ ÷ 2.54 × 10-⁷
f = 1.18 × 10¹⁵ Hz
Therefore, the frequency of an irradiation with wavelength of 2.54 × 10-⁷ metres is 1.18 × 10¹⁵ Hz.
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