The statement 'No new elements can be produced' about nuclear reactions is false (Option b).
What are nuclear reactions?Nuclear reactions are specific reactions that involve atomic nuclei such as fusion reactions and fision reactions.
The atomic nuclei are composed of particles that can react to form new atoms (i.e., protons and neutrons).
In conclusion, the statement 'No new elements can be produced' about nuclear reactions is false (Option b).
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Question 2 of 32
Which best describes what happens during a typical energy conversion?
O A. Some energy is destroyed.
OB. Some energy is created.
C. The total amount of all forms of energy stays the same.
OD. Some mass changes into energy, and some energy changes into
mass.
How many covalent bonds must each carbon atom have around it in an organic or biochemical molecule? 1 2 3 4
Answer:
4 covalent bonds
Explanation:
Each carbon atom can form as many as four covalent bonds with other carbon atoms as well as with other elements. Be able to explain why this is so. Be able to list the four main groups of organic molecules and their functions in living things.
"write the chemical equation between hydrogen (h) and carbonate (CO3) and the product(s)"
Answer:
On heating sodium hydrogen carbonate (NaHCO3). It decomposes to form sodium carbonate (Na2CO3), water (H2O) and carbon dioxide (CO2)
(ii) 2NaHCO3(s)Heatsodiumcarbonate(sodaash)Na2CO3(s)+CO2(g)+H2O(l)
Answer:
Explanation:
2H + + CO3 2- = H2CO3
A mass of 2.20 kg of sodium phosphate is converted into the following number of moles
Explanation:
please refer to the attachment
A chemist prepares a standard solution in the lab using a 500.0 mL volumetric flask. 4.865 g of NaCl is used. What is the molarity of the NaCl solution?
[tex]\huge \underbrace \mathfrak{Answer}[/tex]
0.17 mol/l
Explanation:
⠀
⠀
⠀⠀⠀⠀▨ Note⠀
What is molarity?Molarity is the amount of moles of component present in certain volume of solution.
⠀
What is mole?Mole is a unit in chemistry i.e. 6.022×10²³ ions, atoms or molecules present in the substance.
⠀
⠀
⠀⠀⠀⠀● Solution⠀
Weight of NaCl(m) = 4.865 grams
Volume(V) = 500ml = 0.5 liters
⠀
1 mole of NaCl = 58g
So 4.865g of NaCl(n)
[tex] = \sf \frac{4.865}{58} = 0.084 \: moles[/tex]
⠀
While
[tex] \frak{molarity = \frac{no \: of \: moles}{volume} } [/tex]
⠀
Substituting the required values
⠀
[tex] \sf \implies molarity = \frac{n}{V} \\ \\ \sf \implies molarity = \frac{0.084}{0.5} \\ \\ \ \boxed{ \tt{ \implies molarity = 0.17 \: mol \: {l}^{ - 1} }}[/tex]
A majority of your diet should be 1
vegetables and protein 2. vegetables and fats 3. fruits and vegetables 4. fruits and fats
Answer:
Veggie and proteins
Explanation:
At least based on US govt. recommendation we have to have more veggies and proteins and then fruits.
https://en.wikipedia.org/wiki/MyPlate
Answer:
C. fruits and vegetables
Explanation:
i got it correct on my test i hope you do too. have a good day
Below is a symbol block from the periodic table. What does the number 6 indicate?
Answer:
Carbon And the number of protons
how many grams of granite at 54.1 c must be added to 467.62 of water at 21 C to make the final temp of both come out to be 29.2 C? Specific heat of granite 0.79 J/g C, specific heat of water 4.184 J/g C
Answer:
815.59
Explanation:
Assuming no heat lost to the Surrounding
Total heat lost by granite = Total heat gained by water
mc∆T of granite = mc∆T of water
m x 0.79 x (54.1 - 29.2) = 467.62 x 4.184 x (29.2 - 21.0)
m x 19.671 = 16043.48106
m = 16043.48106/19.671
= 815.59J
Which of the following best describes a weak acid?
A. It dissociates completely and produces OH- ions in water.
B. It only partially dissociates and produces H+ ions in water.
C. It dissociates completely and produces H+ ions in water.
D. It only partially dissociates and produces OH- ions in water.
Answer:
B.
Explanation:
weak acids - partially dissociate to give H+
strong acids - fully dissociate to give H+
How do meteoroligists measure wind chill
Answer:
Researchers at the NWS use a mathematical formula to calculate wind chill. In that formula, the wind speed in miles per hour (v) is subtracted from the air temperature in degrees Fahrenheit (T). It can be used in temperatures below 50°F and wind speeds above 3 mph.
Explanation:
Pb+FeSO4⇒PbSO4+Fe is what kind of reaction?
Answer:
This is a displacement reaction.
Explanation:
The reaction where a part of the reactant is replaced by another reactant is defined as a displacement reaction. In this reaction, Fe of the reactant is displaced or replaced by another reactant Pb to form lead sulfate. So, this is an example of a displacement reaction.
I think that when the temperature decreases, the pressure will __________. When things are cooled,________________..
Answer:
See below ~
Explanation:
From The Ideal Gas Equation,
P ∝ TTherefore,
I think that when the temperature decreases, the pressure will decrease. When things are cooled, pressure decreases.
An ion with a net charge of 2+ loses 5 electrons. What is its charge?
Answer:
+7
Explanation:
It will become MORE positive to + 7
A grain of sand weighs approximately 0.0102 grams. How many molecules of SiO2 are in a grain of sand? Assume that sand is 100% SiO2.
Answer:
0.5
Explanation:
mol = mass : MM SiO₂
mol = 0.0102 : 60 g/mol = 0.00017
molecules = 0.00017 x 6.02 x 10²³ = 1.0234 x 10²⁰
A balloon inflated in a room at 24 degree celsius has a volume of 4 L. The balloon is then heated to a temperature of 58 degree celsius . What is the new volume?
Answer: The new volume of the balloon will be 4.45L
Explanation: We will solve this question through the concept of Charles's law. The law states that the volume of a gas is directly proportional to the absolute temperature, assuming the quantity of gas and pressure remain constant.
Charle's Law
At 27.00 °C a gas has a
volume of 6.00 L. What will
the volume be at 150.00 °C?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert temperature to Kelvin
27°C=300K150°C423KApply Charles law
V1T2=V2T16(423)=27V22538=27V_2V2=94LI would really appreciate some help with this question:
Sulfur dioxide reacts with oxygen to produce sulfur trioxide:
2SO2(g) + O2(g) → 2SO3(g)
What mass of oxygen, in grams, would react completely with 1.28 g of sulfur dioxide?
Relative atomic masses (Ar): sulfur = 32, oxygen = 16
Define the term pH in acid and base
Answer:
a measure of how acidic/base water is.
Explanation:
hope it's helpful (◕ᴗ◕✿)
calculate the molecular weight of ammonium chloride
Answer:
14.0067 + 1.00794*4 + 35.453
Explanation:
Veins carry what type of blood from all the parts of the body back to the heart
Answer:
The veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body's tissues.
Explanation:
hope this helps
Answer:
Co^2 blood or the scientific way to say it oxygen-poor blood
Explanation:
Step 4: Summarize nuclear changes.
a) Use your completed table and models to write a summary that addresses the following questions:
1. How does energy change in these reactions? Is energy needed to start the reactions or is energy given off in the reactions? For each type of reaction, approximately how much
energy is released?
2. How do these energy changes compare in scale to other types of reactions, such as chemical reactions?
Nuclear changes involves changes in the composition of the nucleus of atoms with the release of large amounts of energy.
What are nuclear changes?Nuclear changes are changes which occur in the nucleus of atoms of elements.
Nuclear changes involves radioactive decays to give radiation and energy spontaneously known as radioactivity.
In this type of nuclear change no energy is required to start the reaction but large amount of energy are released.
Nuclear changes can also involve splitting of large nucleus into smaller nucleus of atoms known as nuclear fission or the formation of larger nucleus from the combination of two or more smaller nuclei known as nuclear fusion.
Energy is required to start nuclear fission and fusion but the energy released is far greater.
When compared with energy changes in chemical reactions, the energy released in nuclear reactions is far greater.
Therefore, nuclear changes involves changes in the composition of the nucleus of atoms with the release of large amounts of energy.
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What is the molar mass of fluorapatite (Ca5(PO4)3F)?
Answer: 504.3
Explanation: Add the respective weights of each of the elements in the compound together.
What is the mole fraction of each component of a gas mixture that contains
sulfur trioxide at a pressure of 1.55 atm and sulfur dioxide at a pressure of
0.35 atm?
Answer:
A model of a shopping centre is drawn to scale where 1 cm on the model represent 4 m on the ground. Music shop Thabo's Sports Ware Fati's Clothing shop Grocery store PARKING Coffee shop Toilets Restaurant Shoe store Physiotherapy Health and Fitness center 1.1 Which shop is on the right of the physiotherapy? (2) 1.2 Describe the position of the Coffee Shop in relation to the Toilets. (2)
8. Which of the following is NOT true of atoms?
a. They are composed of molecules.
b. They combine to form compounds. c. They make up elements.
d. They are extremely small.
Answer:
The correct answer should be (A)
Explanation:
This is bcos its atoms ions and molecules that make up matter
On a warm, pleasant day, you notice some clouds in the sky. The clouds are very high up in the sky and look quite thin.
tell me Which type of clouds are in the sky?
cirrus
cumulus
stratus
fog
Answer:
their citrus clouds
Explanation:
I looked it up on the internet
Describe the problem you have chosen to investigate. Plan your investigation and write out the steps in your procedure. Include a sketch of your set up. Explain how this procedure and set-up will help you investigate the problem.
Answer both questions asap for brainliest
Carry out your experiment. Present evidence that you have carried out the experiment below. You may upload photos as evidence. Record your data in a chart. Be sure you have starting data and several data points. Analyze your results. You may want to present your data as a graph. Did the investigation you planned determine the relationships among temperature, the energy transferred, the type of matter, the mass, and the change in the average kinetic energy of the particles as measured by the temperature of the sample? How do you know? Use complete sentences and paragraph form for your analysis.
Answer: baited.
Explanation:
What is the pH range of acids?
O A. 0.7
O B. 7 - 14
O C. 7
O D. 0-14
Answer:
The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
Answer:
7 is the neutral pH; while anything less than 7 is acidic & anything higher than 7 is basic/alkaline
0-14 is the range of acids
Explanation:
A camel hump contains 12 kg of triacyclglycerols,
a) Given that there are 0.491 moles of ATP per gram of fat, how many moles of ATP could be produced by the fat in the camel hump?
______moles
b) If the hydrolysis of ATP releases 7.3 kcal/mole, how many kilocalories are produced by the utilization of the fat?
______kcal
The answer is 5892 moles of ATP will be produced from 12 kg of triacyclglycerols, and 43012 kcal energy will be generated by the utilization of the fat .
What are Triacyclglycerols ?Triacylglycerols are formed by linking fatty acids with an ester linkage to three alcohol groups in glycerol.
Triacylglycerols are the form in which fat energy is stored in adipose tissue.
A camel hump contains 12kg = 12000 gm of Triacyclglycerols
a) It is given that there are 0.491 moles of ATP per gram of fat ,
So for 12000 gm of fat in camel hump 12000 * 0.491 moles of ATP will be produced .
= 5892 moles
Therefore Answer is 5892 moles .
If Hydrolysis of ATP releases 7.3 kcal/mole
so 5892 moles will produce 5892 * 7.3 kcal
=43012 kcal energy will be generated by the utilization of the fat.
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Helium gas occupies a volume of
12.5 Lat -45 degrees Celsius. What
volume will it occupy at 15 degrees
Celsius?
Answer:
15.79 L
Explanation:
V1 /T1 = V2/T2
Re-arrange to:
V1/T1 * T2 = V2 Note that T must be in units K
12.5/ ( -45 + 273.15) * ( 15 + 273.15) = 15.79 L
A gas at 131.0 kPa and 28.0°C fills a flexible container with an initial volume of 2.88 L. If the temperature
is raised to 69.4°C and the pressure increased to 451.0 kPa, what is the new volume in Liters?
(Show all work)
0.837
0.723
0.952
O 0.761
Apply combine gas law
P1V1/T1=P2V2/T2131(2.88)/(273+28)=451V2/(273+69.4)131(2.88)/301=451V2/341.6V2=10.2L