Answer:
22.8 in3 to cm3
= 373.6251 cm3
True or false?
Freshwater can occur as a gas, liquid, or solid.
yes they can i am in 9th rade
Phosphorus-32 (32P) is an isotope that is commonly used for medical and biological research. Phosphorus-32 has a half-life of 14.28 days. A researcher orders a sample of 32P that has an activity of 5.0 mCi when it arrives. If delivery of the sample took 48 hours, what was the activity of the sample when it was shipped from the manufacturer
The activity of the sample when it was shipped from the manufacturer is 4.54 mCi
How to determine the number of half-lives that has elapsedFrom the question given above, the following data were obtained:
Time (t) = 48 hoursHalf-life (t½) = 14.28 days = 14.28 × 24 = 342.72 hours Number of half-lives (n) =?n = t / t½
n = 48 / 342.72
n = 0.14
How to determine the activity of the sample during shipping Number of half-lives (n) = 0.14Original activity (N₀) = 5.0 mCiActivity remaining (N) =?N = N₀ / 2ⁿ
N = 5 / 2^0.14
N = 4.54 mCi
Thus, the activity of the sample during shipping is 4.54 mCi
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100 cm = 1m
(Choose all that apply)
Group of answer choices
this is an incorrect equality
This is a conversion factor
this could be written as 1m / 100 cm
this could be written as 100 cm / 1m
Answer:
This is a conversion factor
If an atom has 10 protons and electrons how many of the electrons will be valence electrons?
Answer:
8 of the electrons will be valence electrons
Explanation:
Answer:
8 valence electrons
Explanation:
We are given the atom has 10 electrons.
The first electron shell holds 2 electrons (maximum)
The second electron shell holds 8 electrons (maximum)
2+8=10
Therefore we would have 2 electrons in the first shell and 8 in the second.
Valence electrons are the outermost electron, and since the second shell is the outermost for the atom, it has 8 valence electrons.
can someone please answer this question for me? i will mark brainliest and it would also be really appreciated! :)
which of the following is a sign a chemical reaction has occurred?
A- A blue liquid is mixed into a yellow liquid, and the mixture turns green.
B- A piece of metal is placed in Water and produces sparks and gas.
C- A liquid is heated on a hot plate, And bubbles form.
D- A solid powder is mixed into a liquid and disappears.
Answer:
The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
B- A piece of metal is placed in Water and produces sparks and gas.
In this reaction: Mg (s) + I₂ (s) → MgI₂ (s), if 10.0 g of Mg reacts with 60.0 g of I₂, and 53.88 g of MgI₂ form, what is the percent yield?
We know the law of conservation of mass
It states that mass is neither formed nor destroyed in any chemical reaction.Mass of reactants=Mass of products.Here
Mg and I_2 are reactantsMgI_2 is product with some yield.Mass of reactants=10+60.0=70.0gMass of MgI_2=53.88gMass of yield=Product-MgI_2=70-53.88=16.12gLets find the percentage
[tex]\\ \tt\hookrightarrow \dfrac{Mass\:of\:yield}{Total\:mass}\times 100[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{16.12}{70}\times 100[/tex]
[tex]\\ \tt\hookrightarrow 0.23028(010)=23.028\%[/tex]
If 10.0 g of Mg reacts with 60.0 g of I₂, and 53.88 g of MgI₂ form then the percent yield is 47.09%.
What is percentage yield?
The percentage yield shows how much product is obtained compared to the maximum possible mass. When experimenting with different solutions or in the manufacturing of chemical solutions we have by-products and the actual intended products and errors in calculating them as well that makes calculated yield different from theoretical yield. Mathematically, it is given by
%yield = (calculated yield ÷ theoretical yield) × 100
Given,
10.0 g of Mg
60.0 g of I₂
53.88 g of MgI₂ forms
Mg (s) + I₂ (s) → MgI₂ (s)
24.3g Mg forms 278.11g MgI₂
1g Mg forms 11.44g MgI₂
10.0 g of Mg forms 114.4g MgI₂
%yield = (53.88 ÷ 114.4) × 100 = 47.09%
Therefore, if 10.0 g of Mg reacts with 60.0 g of I₂, and 53.88 g of MgI₂ form then the percent yield is 47.09%.
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Balancer the equation
C2H6 + O2 = CO2 + H2O
Answer:
2C2H6+7/2O2=2CO2+3H2O
Explanation:
2-c-1 -2
6-H-2-6
7/2*2 =7 2-O-2+1=3-4+1=5-7
sorry, if you don't understand the explanation part. It would be much easier if you could see somebody explaining it and writing it out.
they have videos online to explaining it
Answer:
2 C2H6 + 7 O2 - > 4CO2 + 6 H2o
Explanation:
im sure
how do you calculate metal density?
Answer:
You can divide the mass by the volume to calculate the density of the metal
Explanation:
The final answers for the following problems should be written
6. Convert 2.225 x 1010 grams into kilograms.
Answer:
2.24725 kilograms
Explanation:
To convert grams to kilograms, you divide the number of grams you have by 1000. So, 800 g = 2.225 x 1010/1000 = 2.24725 kg
What is the connection of ascorbic acid when one tablet is dissolved in 200cm cubed of water ?
Answer:
Option-D: 2.3 × 10⁻³ mol/dm³
Explanation:
Calculate moles of ascorbic acid,
Moles = Mass / M.Mass
Moles = 0.080 g / 176 g/mol
Moles = 0.00045 mole
Also,
Molarity = Moles / Vol. in dm³
Molarity = 0.00045 mol / 0.20 dm³
Molarity = 0.00227 mol.dm⁻¹ or 2.3 × 10⁻³ mol/dm³
H2CO3(aq) → CO2(aq) + H2O(l) After strenuous exercise, you breathe heavily, exhaling and removing CO2 from your body. The removal of CO2 causes a shift to the __________ and the ____________ of carbonic acid in the blood to help maintain a safe blood pH range.
Answer:
did you find the answer
Explanation:
help
Answer:
D. right ; decomposition
Explanation:
What is the mass of 11 moles of water (H2O)?
Answer:
198.11 g
Explanation:
Moles = Mass / M.Mass ...... (1)
Also,
M.Mass of Water = 18.01 g/mol
Moles of Water = 11 moles
Solving eq. 1 for mass,
Mass = Moles × M.Mass
Putting values,
Mass = 11 mol × 18.01 g/mol
Mass = 198.11 g
explain how air pressure keeps a balloon infalted?
Answer:
Blowing up a balloon involves forcing additional air particles from your lungs into the balloon. These particles hit the inside walls of the balloon creating enough air pressure to force the rubber of the balloon to expand and the balloon to inflate.
Explanation: hopes it helps :)
Why don't the changes to the mass of the planet affect the orbital path of the
planet?
Answer:
because the force depends upon the product of both masses and the square of the distance between them, whereas the planet's acceleration depends on just the mass of the Sun and the square of the distance between the Sun and planet.
how do I solve this organic chemistry question?
Answer:
a) 3,3-dimethyl-2-butanol
b) Attached below
c) Yes, this compound is optically active because it has one chiral carbon. Highlighted as Red below.
d) Structures attached below.
e) Isomers shown below.
What common characteristics do all planets share?
A Planets are made of gas, orbit the sun, and have atmospheres.
B Planets are made of rock, orbit the sun, and have atmospheres.
C Planets have moons, have atmospheres, and are made of rock, gas, or ice.
D Planets have atmospheres, are made of rock or gas, and some have moons or rings.
Answer:
The answer is D
Explanation:
How many moles are in 33 grams of Boron (B)?
Answer:
2.77495 moles
Explanation:
Boron= 10.811g (according to periodic table)
[tex]33g*\frac{1mole}{10.811g B}=2.774951 moles B[/tex]
Determine the formula weight of caffeine, C₈H₁₀N₄O₂. Provide an answer to two decimal places.
Let's find
[tex]\\ \tt\hookrightarrow C_8H_10N_4O_2[/tex]
We need accurate mass[tex]\\ \tt\hookrightarrow 8(12.011)+10(1.007)+4(14.006)+2(16.0)[/tex]
[tex]\\ \tt\hookrightarrow 96.088+10.07+56.024+32.0[/tex]
[tex]\\ \tt\hookrightarrow 196.182g/mol[/tex]
[tex]\\ \tt\hookrightarrow 196.18g/mol\:or 196.18u[/tex]
The formula weight of caffeine, C₈H₁₀N₄O₂ is 194.18 u.
What is formula weight?
The formula weight of a substances is define as the sum of atomic weight of each atom in its chemical formula.
It generally applied to the substances that does not consist of individual molecule.
To calculate formula weight for a compound select the atomic mass of each elements in the compound from periodic table, multiply by the number of atoms and at the end sum the result.
C8H10N4O2
To calculate formula mass of caffeine
= 8(12.011) + 10(1.007) + 4(14.006) + 2(16.0)
= 96.088 + 10.07 + 56.024 + 32.0
= 194.182 g/mol = 194.18 u
Thus, the formula weight of caffeine, C₈H₁₀N₄O₂ is 194.18 u.
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How does the motion of particles compare between different phrases of matter?
Answer: gas vibrate and move freely at high speeds.
Explanation: liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.
Using a dimensional analysis conversion chart, convert 2.3*10^7 milliseconds into hours.
Now
[tex]\\ \tt\hookrightarrow 2.3\times 10^7[/tex]
[tex]\\ \tt\hookrightarrow 23\times 10^6[/tex]
[tex]\\ \tt\hookrightarrow 23000\times 10^3s[/tex]
[tex]\\ \tt\hookrightarrow 23000s[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{23000}{3600}h[/tex]
[tex]\\ \tt\hookrightarrow 6.3h[/tex]
If the image shows a model of ocean fossils but the actual fossils were found in the desert, what might one assume about the history of the area where they were found? Its for my sis quiz.
A.That at one time the environment was much colder in Antarctica.
B.That the land of this desert is relatively young geologically speaking.
C.That at one time, the environment of that desert was under an ocean.
D.That at one time in the distant past someone threw away some marine fossils in the desert.
Answer:
C
Explanation:
The cold doesn't mean water (A), the age of the desert doesn't mean much in this context (B), that doesn't make any sense (D), but the desert being an ocean in the past does explain where the fossil came from because the organism would have been in the area before death.
What do all acids have in common?
Answer:Both acids and bases produce a part of a water molecule. Bases dissociate hydroxide (–OH) ions and acids, hydrogen (H+) ions
Which compound is composed of oppositely charged ions?
this is what you can pick through organs, structure or tissue : A group of cells connected together. They have similar make-up and work to do.
the answer is a group of tissue.
Which of the following are forms of ENERGY? Click all that apply!
O LIGHT
O SOUND
O ELECTRICITY
Identify the missing coefficient in the balanced equation and classify the type of reaction. C2H5OH + 3O2 ⟶ _____CO2 + 3H2O 2; Combustion 2; Neutralization 3; Combustion 3; Neutralization
Answer:
It is a combustion reaction
Explanation:
I'm not sure about the number, but for sure it's a combustion reaction because the products are water and co2.
name two luminous objects other than the sun
Answer: flame in a lamp, tube light, electric bulb
Explanation:
if you need 2.5 mole of sodium hydroxide what mass of aodium hydroxide does weight have
Explanation:
[tex]\large{ \star \fcolorbox{magenta}{purple}{ \fcolorbox{magenta}{blue}{ \fcolorbox{magenta}{pink}{ \fcolorbox{magenta}{red}{ \sf{ 2.5g }}}}}} \star[/tex]
Kevin travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Which statement explains this?
A) The Northern Hemisphere is experiencing an equinox.
B) The Southern Hemisphere is experiencing an equinox.
C) The Southern Hemisphere is tilted toward the sun, so it is summer in Australia.
D) The Southern Hemisphere is tilted away from the sun, so it is summer in Australia.
Answer:
The Northern Hemisphere is tilted away from the sun.
Explanation:
Kevin travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Which statement explains this? The Northern Hemisphere is tilted away from the sun. When it is winter, the United States receives the least direct solar energy, as compared with the rest of the year.
Hello! Allow me to help you :)
The answer is B) The Southern Hemisphere is experiencing an equinox.
What is an Equinox?
The two days of the year on which neither hemisphere is tilted toward or away from the sun.
This means what?
This means that if he goes to the Northern Hemisphere it will be warm. And if he goes to the Southern, he will be warm too.
~*Answer*~
The Southern Hemisphere is experiencing an equinox.
Reasoning:
Kevin travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Which statement explains this? The Northern Hemisphere is experiencing an equinox. The Southern Hemisphere is experiencing an equinox. The Southern Hemisphere is tilted toward the sun, so it is summer in Australia.
Therefore, your answer is B) The Southern Hemisphere is experiencing an equinox.
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Some chemical reactions releases energy other store energy what important chemical reaction storage energy?
Answer:
endothermic reaction
Explanation:
a chemeical reaction that stores energy is called endothermic reaction. More energy released as products form than the energy needed to break the reactants apart.
