Which statement best describes the atoms in a gas?
Answer:
They move freely in all directions.
Explanation:
A sample originally contains 24 grams of a radioactive isotope. After 18 days, 18.8 grams of the isotope remain in the sample. What is the half-life of the isotope
The sample's decay constant for the given time of radioactive decay is 0.0058 days⁻¹. Thus, the half life of the sample is 119.48 days.
What is radioactive decay?Heavy unstable radioactive nuclei undergo radioactive decay by the emission of charged particles. They stable isotopes or new atoms by radioactive decay.
It is given that the sample of 24 grams decays to 18.8 grams within 18 days. The decay constant k can be calculated as follows:
k = 1/t log (Ci/Ct)
Where Ci is the initial amount and Ct be the final amount.
k = 1/18 log (24 g /18.8 g)
= 0.0058 days⁻¹
Now, the half life time of the sample can be calculated as:
t1/2 = 0.693 / k
= 0.693/0.0058 days⁻¹
= 119.4 days.
Therefore, the half life of the sample is 119.4 days.
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What happens to the energy absorbed during an endothermic reaction
Answer:
more energy is absorbed when the bonds in the reactants are broken
Question 22 of 25
What are two benefits of scientists using a diagram to model the water cycle?
I A. Only a few factors in the water cycle can be shown on the
diagram
B. It can show changes that occur in many different parts of Earth at
the same time.
C. It can be used to show as much detail as is present in the actual
water cycle.
D. It can be used to show how the parts of the cycle relate to one
another.
Answer:
D. and B.
Explanation:
I got it right on my quiz
Compare ferns, gymnosperms, and angiosperms by writing each characteristic in the box underneath the correct plant type. • reproduce with cones • reproduce with spores • reproduce with flowers • existed the longest in Earth history • newest type of plant in Earth history • has needle-like, waxy leaves 1)
Ferns reproduce with spores which existed the longest in Earth history.
Gymnosperms reproduce with cones and has needle-like, waxy leaves.
Angiosperms reproduce with flowers and newest type of plant in Earth history.
How ferns, gymnosperm and angiosperm reproduce?Ferns reproduce with spores that existed the longest in Earth, gymnosperms reproduce through the formation of cones having needle-like, waxy leaves whereas angiosperms reproduce with flowers which turns into seed. The newest type of plant in Earth history is also belongs to this group.
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How does the crystallization of igneous material occur?.
If 50 grams of Al2O3 was produced, how many moles of aluminum reacted?
Answer:
one mole of aluminium has reacted in it.
Explanation:
Al : Al2O3=100 gmol-1
4 : 2
2 : 1mol→100g
1 : }50g→1/2mol
There is oil that is coming up on the beach from the waves. What most likely caused the oil to get in the water?
Animals have carried oil from land to the water.
An accident caused an oil rig to spill oil into the ocean.
The wind has blown oil into the ocean from land.
The oil has come from a crack in the ocean floor.
Answer:
The answer is (B) An accident caused an oil rig to spill oil into the ocean.
Explanation:
Someone would know that they are polluting the ocean but someone left it there so the water or and accident cause the oil rig to spill.
Answer:
The answer is (B) An accident caused an oil rig to spill oil into the ocean.
Explanation:
The answer is (B) An accident caused an oil rig to spill oil into the ocean.
Name the functional group in the
following molecule:
NH2
A. aldehyde
B. amine
C. amide
D. thiol
Answer:
The functional group is called a amide so its, C.
Explanation:
A solution has a concentration of 0.8 M and contains 15 g AgBrO3. What is the volume of the solution
Answer:
Solution Concentration: Molarity Moles of solute in one liter of solution Used because it describes how many molecules of solute are in each liter of solution Tro: Chemistry: A Molecular Approach, 2/e 6 amount of solute (in moles) Molarity, M = amount of solution (in L) moles of solute M = L of solution or simply 4
GOOD LUCK!!
A solution has a concentration of 0.8 M and contains 15 g AgBrO3.The volume of the solution is 0.08 L.
What do you mean by the term molarity ?The term molarity is defined as the number of moles of solute per litre of solution. Molarity, M = amount of solution (in L) moles of solute M = L of solution.
It is also called as molar concentration. As the number of moles of solute is measure out in mol and the volume of solution will be in litre. Hence, the unit of molarity is mol L - 1.
Given:
Molarity = 0.8 M
Mass = 15 gram
The molar mass for AgBrO3 = 235.769 g/mol.
Then calculate the number of moles in the sample by dividing the given mass by the molar mass.
15g 235.769 g/mol = 0.064 moles
Molarity = Number of moles/volume
Volume = Number of moles/Molarity
Volume = 0.064/0.8 M
Volume = 0.08 L
Thus, the volume of the solution is 0.08 L.
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What change was caused by a change in temperature?
Answer:
The temperature of the earth determines how much water there is in our atmosphere. Carbon dioxide is the most commonly discussed of the greenhouse gases. This has occurred primarily because of the huge amounts of carbon dioxide humans are moving from the earth to the atmosphere in the burning of fossil fuels.Explanation:
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Use the map to identify which body of water (A, B, C, or D) matches bar 3, and explain your answer.
please help me 50 points!
Answer:
AgNO and NaNO + AgCI
Explanation:
Because 10 mol of NaCI is AgNO!
Explain anaerobic respiration with yeast in your own words
Answer:
Is breaking down of food substances in the abscence of Oxygen
Select the statement that correctly describes the connection between two nucleotides:
A phosphodiester bond would form between the phosphate groups of each of the nucleotides..
A phosphodiester bond would form between the base of one nucleotide and the phosphate of the second nucleotide.
A phosphodiester bond would form between the phosphate group of one nucleotide and a hydroxyl group of the second nucleotide.
A phosphodiester bond would form between a purine base of one nucleotide and a hydroxyl group of the second nucleotide.
Answer:
The band that looks like milk in the night sky isn't actually milk,
Explanation:
Which is a trait of a technical text?
What is one way to spearate awater an salt
Answer:You can boil or evaporate the water and the salt will be left behind as a solid. If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water.
Explanation:
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14 Water falling from the sky as
rain or sleet is called
A water cycle
B precipitation
C snow
D hail
Pls help
Answer:
b precipitation
Explanation:
When rain or sleet falls, it is concidered precipitation!
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How many elements make up Ibuprofen?
C13H18O2
Answer:
Explanation:
wouldn't it be three because every capital is a new element?
Last night you were watching the news on the television and the weather forecast for today is muggy and hot. The temperature in the house is rising you turn on the air condition unit and made the room temperature lower.
Answer:
The weather from the outside has impact n what goes on inside. Due to it being hot and muggy out, the weather was able to mess with the temperature in the house.
Explanation:
An air condition is used to regulate the temperature of a room by removing heat as well as reducing humidity.
What is temperature?Temperature is the degree of coldness or hotness of an object or a particular place.
The temperature of an area is affected by the climate and the amount of sunshine.
Also due to heating, water vapor rises into the atmosphere resulting in humidity.
An air condition makes a temperature room cooler by removing heat as well as reducing humidity.
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How many grams of sodium chloride are present in 11.00 moles?
331.0 g
4500 g
156.6 g
642.9 g
A sample of neon is at 75 C and 115 kPa. If the pressure changes to 127 kPa and the volume remains constant, what is the new temperature, in C?
The new temperature of the sample of neon is 111.31 °C.
What is temperature?Temperature can be defined as the hotness or coldness of a thing or place.
To calculate the new temperature of the sample of neon, we apply the formula below.
Formula:
P/T = P'/T'.................. Equation 1Where:
P = old pressure valueP' = new pressure valueT = old temperature valueT' = new temperature value.Make T' the subject of the equation
T' = P'T/P............ Equation 2From the question,
Given:
P' = 127 kPaP = 115 kPaT = 75 °C = (75+273) = 348 KSubstitute these values into equation 2
T' = (127×348)/115T' = 384.31 KT' = (384.31-273) °CT' = 111.31 °CHence, The new temperature of the sample of neon is 111.31 °C.
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What is the oxidation number of oxygen
in N02-?
Nitrogen dioxide (NO2) is a molecule which contain two oxygen atom and one nitrogen atom. Oxidation number of nitrogen atom can be found by two methods, algebra method and observing structure of molecule. Oxidation number of nitrogen is important to decide to whether NO2 can be oxidized or reduced.
CHEMCIAL TECHNOLOGY QUICK CHECK which activity would be considered resource extraction? eating beef raising cattle eating deer hunting deer WILL GIVE BRAINIEST TO WHOEVER GOVES ME THE WHOLE QUICK CHECK
Hunting deer can be considered resource extraction. It involves the loss of biodiversity.
What does resource extraction mean?Resource extraction refers to the usage of fundamental resources (biodiversity resources) from the environment.
Hunting deer is considered a resource extraction activity because this activity involves the loss of biodiversity.
Biodiversity is a fundamental issue for the health (homeostasis state) of the whole ecosystem.
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Answer:
Hunting dear, fewer trees to a decrease in earths carbon dioxide absorption, advancements in medicine, Hydrogen is a component of water , removing acid causing oxides from factory smoke
Explanation:
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4. Which is a clastic rock?
A
coal
B.
limestone
U
rock gypsum
D
sandstone
Answer:
B limestone
Explanation:
which two events are apart of the rock cycle
Answer:
The key processes of the rock cycle are crystallization, erosion and sedimentation, and metamorphism.
Explanation:
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Answer:
Earths heat and hydrological cycle
Explanation:
How many moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas? (5 points)
2 moles of water
4 moles of water
5 moles of water
7 moles of water
Answer: 4 moles of water
Explanation:
A particular tank of oxygen gas contains 785 L at 21°C.If the pressure remains constant,what volume will the gas occupy if the temperature is changed to 28°C? (Write procedure)
The bottom wave has a greater _____
Answer:
frequency because it moves up and down faster.
Explanation:
Answer: current and pull making quicker wave and smaller
Explanation:
What was the concentration of my stock solution if I used 23mL of it to make 102 ml of 1.4 M dilution?
Answer:
formula:c1v1=c2v2
Explanation:
v1=102ml,c1=1.4mol/l
v2=?;c2=2.4mol/l
v2=v1×c1÷c2=102ml×1.4mol/l÷2.4mol/l
=59.5ml
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Read the passage.
Water can react with hydrochloric acid (a strong acid) to form hydronium and chlorine ions. In this case, water acts as a base. Water also reacts with ammonia (a strong base) to form ammonium and hydroxide ions. In this case, water acts as an acid.
Which option correctly describes the reason for this phenomenon?
1. Water is a neutral compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
2.Every substance can act as a base or an acid depending on the reaction they partake in. This property of substances is called amphotericity.
3. Water acts as a conjugate acid when coupled with a strong acid, or as a conjugate base when coupled with a strong base.
4. Water is an amphoteric compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.