How much energy is needed to completely boil a 5.05g sample of water?
Given what we know, we can confirm that the amount of heat energy that would be required in order to boil 5.05g of water is that of 11.4kJ of heat.
Why does it take this much energy to boil the water?We arrive at this number by taking into account the energy needed to boil 1g of water to its vaporization point. This results in the use of 2260 J of heat energy. We then take this number and multiply it by the total grams of water being heated, in this case, 5.05g, which gives us our answer of 11.4 kJ of energy required.
Therefore, we can confirm that the amount of heat energy that would be required in order to boil 5.05g of water is that of 11.4kJ of heat.
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what is the heat of fusion of water in calories per mole? Answer with explanation
Answer:
1436.2 calories per mole H2O
Explanation:
one mole of water has mole weight of 2 * H + O =
2 * 1.008 + 15.999 = 18.015 gm
the heat of fusion for water (the heat required to turn ice to water )
is 79.72 cal/gm
18.015 gm * 79.72 cal/gm = 1436.2 cal
What is the frequency of a radio wave with a a wavelength of 3 m? (Hint: MHz
stands for megahertz or 1 million hertz)
A. 100 MHz (1 x 108 HZ)
B. 10 MHz (1 x 10 Hz)
C. 1 MHz (1 x 105 Hz)
D. 1000 MHz (1 x 10° Hz)
Answer:
a. 1 x 10^8
Explanation:
100 MHz = 100,000,000 Hz = 10^8 Hz
Epidemiological studies looks into:
A. Trends in exercise
B. Trends in genetics
C. Trends in drug effectiveness
D. Trends in statistics
Answer:
It is used in medical research.
Explanation:
So its answer is trends in drug effectiveness
In the given question, epidemiological studies look into trends in statistics. The correct answer is option D.
Epidemiology is the study of how diseases spread and how to prevent them.
Epidemiologists use statistics to understand how diseases spread and how to prevent them from spreading further. They look at trends in:
The number of cases of a diseaseThe age and sex of people who get the disease, and Other factors that may affect the spread of the disease.Therefore, Option D. "Trends in statistics" is the correct answer.
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What is the pH of a solution with a pOH=6.31?
Answer:
pH= 2.199971 is the correct answer of given statement
During nuclear decay, if the atomic number of the daughter atom decreases by one, but the mass number is unchanged, the radiation emitted is
a
a gamma ray
b
a beta-plus particle
c
an alpha particle
d
a beta-minus particle
Answer:
A beta-particle (plus or minus)
do we need greenhouse gases? explain.
Answer: Yes, we need greenhouse gases. Greenhouse gases are important because they sustain a healthy temperature on our planet. Greenhouse gases absorb heat from the sun and keep it in the atmosphere. The heat emitted by the Earth would pass outwards from its surface into space if greenhouse gases were not active. However, greenhouse gases aren’t just important. They can cause harmful consequences to our environment, too. Letting greenhouse gases into our air causes climate change and respiratory diseases from smog and air pollution.
Explanation:
what coefficient would balance the following equation ch4+_O2--> CO2+2H2O
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The balanced chemical equation for the shown reaction is :
[tex]\qquad \tt \:CH_4 + 2 \: O_2 \rightarrow CO_2 + 2 \: H_2O[/tex]
Where, coefficient of
[tex] \textsf{CH4 is 1} [/tex][tex] \textsf{O2 is 2} [/tex][tex] \textsf{CO2 is 1} [/tex][tex] \textsf{H2O is 2} [/tex]Migration is _______. a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location c. the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations Please select the best answer from the choices provided A B C DMigration is _______. a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location c. the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations Please select the best answer from the choices provided A B C D
Answer:
A
Explanation:
Answer:
D is the correct answer. the seasonal movement of organisms between locations
Which technique can be used to remove air bubbles from a syringe? a) Hold the syringe downward, shake vigorously for 10 seconds, and expel the bubbles through the needle using the syringe plunger. Hold the syringe upright, provide a firm tap or flick to the b) barrel, and expel the bubbles through the needle using the syringe plunger. Hold the syringe upright, shake vigorously for 10 seconds, c) and expel the bubbles through the needle using the syringe plunger. Hold the syringe downward, provide a firm tap or flick to the d) barrel, and expel the bubbles through the needle using the syringe plunger.
hold the syringe downward,shake vigorously for sometime,and expel the bubbles through the needle using the syringe plunger. hold the syringe upright, provide a firm tap or flick to the barrel
Which combination of reactants will cause a reaction? Choose all that apply.
NaCl and Fe
Br2 and KI
Mg and AlCl3
Zn and CuCl2
Answer:
mass of sodium hydroxide is needed to react completely with 10.0 g of iron(III) chloride
Explanation:
How might the hydrosphere affect the biosphere?
A; a river floods animal burrows
B; soil from erosion fills up a pond
C; a thunderstorm causes a landslide
D; plant roots break down large rocks
THE ANSWER IS OPTION B.
B;SOIL FROM EROSION FILLS UP A POND
HOPE THIS HELP
[tex] \small \color{gold}{ \underline{ \tt \bold \pink{ \: by:MissS3xy}}}[/tex]
I NEED HELP ASAP A liquid does ____________ have a definite shape but has a __________ volume. *
Answer:
A liquid does NOT have a definite shape but has a DEFINITE volume.
Explanation:
If you pour water in a shaped glass or container, it takes that shape of the object. But if you pour water on the table, it will run all aver the place.
What type of molecule is butanoic acid?
• A. Amine
• B. Alcohol
• C. Carboxylic acid
• D. Ether
Answer:
C
Explanation:
just took the test
Select the correct structure that
corresponds to the name.
4-octyne
A. CH3CH₂CH₂C = CCH₂CH₂CH3
-CEC-
B.
C. both
Answer:
ugh this wont save anyway i think i'm just checking if ill save
Explanation:
if i does C both
hope this helps
The correct selection for 4-octyne structure is A. Hence option A is correct.
What is Molecule and atom ?Atom is smallest entity of a body. Body is made up of atoms. it is basic building block of a body. An atom consist of electrons, protons and neutrons as sub atomic particle. whole mass of the atom is concentrated at the center of the atom which we call it as nucleus, nucleus consist of proton and neutron. Electron revolve around the nucleus at determined(fixed) orbit. Total number of protons in the atom decides the atomic number and the elements in the periodic table.
Molecule is made up of atoms, it is formed when two or more atoms bound together. The electrons in the outermost orbit are responsible for the molecule formation. Electrons are shared by the atoms in the entire molecule.
4-Octyne, also known as dipropylethyne, is a type of alkyne with a triple bond at its fourth carbon. its chemical formula is C₈H₁₄.
C₈H₁₄ are bounded like . CH₃CH₂CH₂-C ΞC-CH₂CH₂CH₃
Hence option A is correct.
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why does the moon and the earth have the same mass
Answer:
Moon rocks contain few volatile substances (e.g. water), which implies extra baking of the lunar surface relative to that of Earth. The relative abundance of oxygen isotopes on Earth and on the Moon are identical, which suggests that the Earth and Moon formed at the same distance from the Sun.
Explanation:
Answer:
They DON"T have the same mass !
Explanation:
Assume that the half-life of an M&M is 15 seconds A. you start with M& M's, how many would be left unchanged after 1 minute? Show all work below
Answer:
See below
Explanation:
1 minute is 4 halflives ( because 4 x 15 sec = 1 minute)
(1/2)^4 = 1/16
you will have 1/16 as many M&M as you started
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what are the common diseases that are
found in poultry ?
Answer:
Diseases of Poultry
a. ESCHERICHIA COLI INFECTIONS.
b. SALMONELLOSES.
c. PARATYPHOID INFECTIONS.
d. FOWL CHOLERA.
e. RIEMERELLA ANATIPESTIFER INFECTIONS.MYCOPLASMA.
f. NECROTIC ENTERITIS.
g. CHOLANGIOHEPATITIS IN BROILER CHICKENS.
Explanation:
Answer:
◎Bacterial diseases
◎Mycoplasmosis (CRD, Air sac, Sinusitis)
◎Fowl Cholera
◎Necrotic Enteritis
◎Ulcerative Enteritis (Quail disease)
◎Pullorum Disease
◎Fowl
◎Botulism
◎Infectious Coryza
◎Omphalitis
◎Erysipelas
◎Parasitic diseases (internal)
◎Parasitic diseases (external)
◎Infectious Bronchitis
◎Viral diseases
◎Newcastle Disease
◎Quail Bronchitis
◎Lymphoid Leukosis
◎Marek's Disease (Visceral Leukosis)
◎Infectious Bursal Disease (Gumboro)
Explanation:
:)
What might be the result of removing a top predator from a marine biome?
A: Fish Become Over Populates
B: There is no effect on the Biome
C: The Ocean becomes more polluted
D: A Prey Animal Becomes the top predator
Answer:
A
Explanation:
Due to the fact that no one will eat the fish, their population starts growing.
Ca (s) + 02 (g) 2CaO (s)
O A. 4,1,2
O B. 3,1,2
• C. 2,1,2
O D. 1,1,2
Answer:
The answer is C.2,1,2
Explanation:
The reason why the answer is C.2,1,2 is because if you put a 2 Infront of the first calcium it will be balanced with the calcium in the product side and if you put one in front of the oxygen that wiil be two and it will also be balanced with the oxygen on the product side and seeing that a 2 the coefficient is already on the product side the equation is already balanced
Answer:
C. 2,1,2
Explanation:
Ca(s) + O₂ (g) →2CaO(s)
on the reactants side:
1 Ca
2 O (because the subscript 2 counts as there being 2 O molecules. if you put a 2 in front of the O₂ that would be 2x2=4)
On the product side:
2Ca
2O
you would just need to add a 2 to the Ca on the reactants side to balance the equation.
I hope this helps!
How many mL of a 2.50 M K2SO4 solution are required to obtain 1.20 moles of
K2SO4?
The answer is: " 480 mL of [2.50 M K₂SO₄] solution."
____________
Explanation:
Given :
1.20 mol K₂SO₄ ⇒ __? mL __ of 2.50 M K₂SO₄ ;
____________
Note: 2.50 M K₂SO₄ = 2.50 mol/ L ;
____________
1.20 mol = [tex]\frac{1 L}{2.50 mol}[/tex] ;
The units of "mols" cancel; since "mol / mol = 1 ;
and we have: " [tex]\frac{(1.20*1) L}{(2.50)} = [{\frac{1.20}{2.50}}] L = (0.480) L ;[/tex]
→ {Note: we want to keep the appropriate number of "significant figures"; so we write our answer: "0.48 L" ; as: "0.480 L" .
→ Now, we want to solve for the number of "mL ("milliliters").
→Note the exact conversion: "1000 mL = 1 L ;
So: ("0.480 L") * (1000) = " 480 mL of solution." → which is our answer.
____________
Hope this helps!
____________
Explain how chemical and physical changes affect our lives. (3-4 sentences pls!)
Answer:
Explanation:
Chemical and physical changes occur all around us all the time. These changes are essential parts of our daily lives, for example, digesting food, combustion, osmosis, and phase changes. However, a few of the chemical and physical changes that occur daily are harmful for the environment. This project introduces four physical/chemical changes that are related to the following environmental issues: plastic decomposition, global warming, effects of acid rain, and oil spills.
Why is it necessary to determine if a reactant is limiting reagent in a
reaction?
A. Different products will start being formed once the limiting
reagent is gone.
B. The reaction will not happen if one of the reagents is a limiting
reagent.
C. Stoichiometry cannot be used to calculate amounts if there is a
limiting reagent.
D The amount of product formed will be limited by the amounbof the
limiting reagent.
Answer:
D
Explanation:
Hi!
Let's say you have 2 different reactants, A and B, and 1 product, C.
2A + 4B -> 3C
Let's say that once we do the calculations, we find that A is the limiting reactant/reagent.
All of the A is used up in the reaction, leaving behind some excess B, and forming C.
Now that there is only B left behind, it has nothing to react with, so it cannot create any more product.
I hope this helps!
If you have 155 mL solution of a 0.762 M FeCl3 solution, how many
moles of FeCl3 are contained in this sample?
Moles are the product of the molar concentration and the volume of the solution. The moles of Ferric chloride is 0.118 moles.
What are moles?Moles are the smallest unit of the measurement of atoms and molecules. It is calculated by the molar concentration and the volume of the solution.
Given,
Molar concentration of ferric chloride = 0.762 M
Volume of solution = 0.155 L
Moles are calculated as:
[tex]\begin{aligned} \rm Moles &= \rm Molarity \times Volume (L) \\\\&= 0.762 \times 0.155\\\\&= 0.118\;\rm mol\end{aligned}[/tex]
Therefore, 0.118 moles of ferric chloride are present in the sample.
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What are some individual needs that need to be taken into consideration when planning an exercise program?
A. Current level of health, goals and diet
B. Age, goals, and diet
C. Goals, forms of exercise they enjoy and availability
D. Age, current level of health, current level of fitness
Answer:
c
Explanation:
The current level of health, goals, and diet need to be taken into consideration while planning an exercise program.
What is the planning of an exercise program?Exercise programs should include some specific exercises to improve cardiovascular health, such as swimming, jogging, rowing, elliptical exercises, and biking.
To assess your current fitness level use or make an appointment with an exercise professional for a fitness assessment. Consulting an exercise professional when designing a fitness program can help you reduce injury and customize a program to your needs. The adult pre-exercise screening tool consists of exercise guidelines.
Consider your goals and think about likes and dislikes. Plan a logical progression of activity and build activity into a daily routine. If you begin to lose motivation then set new goals or try a new physical activity.
Give time for recovery after exercising and make sure to have an adequate healthy diet and assemble exercise clothing.
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calculate the mass in grams of the following 0.2moles of iron
Guess which one. It’s not B or D btw.
Answer: A
Explanation:
I took this test its A
How many moles of gas will occupy a volume of 5.50 L at 6.20 kPa and 45.0 °C?
Give the systematic name for the following coordination compound or complex ion:
The accurate systematic name of the coordination compound is diaminodicyano platinum II.
What is a coordination compound?A coordination compound is which contains a central metal atom or ion along with ligands in its coordination sphere. Some times, counterions may alaso be present to balance the charges.
The accurate systematic name of the coordination compound is diaminodicyano platinum II.
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what is the volume of 1.34 mol SO2 at STP
Answer: 30.0 L S02
Explanation: It was right on mine