Answer:
A. layers of sediment are pressed down on top of each other
B. melted rock cools, either above ground or underground Correct
C. water breaks off pieces of rocks and moves them to new locations
D. another kind of rock is exposed to a lot of pressure and heat
Answer: melted rock cools, either above ground or underground
Explanation: Igneous rocks form when melted rock cools, either above ground or underground. Examples of igneous rocks include granite, pumice, and obsidian.
The half-life of I-37 is 8.07 days. If 25 grams are left after 40.35 days, how many grams were in the original sample?
Answer:
800 g
Explanation:
We can express the decay of I-37 using the formula:
Final Mass = Initial Mass * [tex]0.5^{\frac{Time}{Half-Life} }[/tex]We input the data:
25 g = Initial Mass * [tex]0.5^{(\frac{40.35}{8.07})}[/tex]And solve for Initial Mass:
25 g = Initial Mass * [tex]0.5^{5}[/tex]25 g = Initial Mass * 0.03125Initial Mass = 800 gMeaning that out 800 grams of I-37, only 25 will remain after 40.35 days.
Direction: Write true if the statement is correct and false if it is in correct.
1. Gravity cause all objects to fall at the same rate of speed as there is no air
resistance.
True. 1.) Gravity cause all objects to fall at the same rate of speed as there is no air
resistance.
Explanation:In fact, gravity works independently of mass. This means that all objects should fall at the same rate.
If there is no air resistance, or the same amount of air resistance, then objects of the same mass will fall at the same rate.
#CarryOnLearningHow was the position of planet Uranus predicted?
Upon studying the orbit of Uranus more closely, astronomers realized its orbit was being affected by the presence of another very large mass - so the hunt was on for another large planet. He sent his prediction to the Astronomer Royal, Sir George Airy, who passed it on to an 'observer'.
más inteligente o gracias por favor :)) <33 / brainliest or a thank you please :)) <33
The position of Uranus was predicted by determining the position of a larger mass ( Neptune ) exerting a gravitational push on Uranus
Uranus is the 7th planet in the galaxy it was initially discovered with the aid of a telescope by an astronomer whom initially thought it was a star.
The position of Uranus was predicted when an astronomer ( John Couch Adams ) and his colleague predicted the gravitational effect on Uranus from another larger mass ( Neptune ). they discovered the position of the larger mass affecting the orbit of Uranus and the position of this larger mass ( Neptune ) was used to predict the position of Uranus in the galaxy.
Hence we can conclude that the position of Uranus was predicted by determining the position of a larger mass ( Neptune ) exerting a gravitational push on Uranus
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Determine whether each described process is endothermic or exothermic.
a. Ice melts into liquid water
b. A process with a calculated positive q.
c. Wood burns in a fireplace.
d. A process with a calculated negative q.
e. Acid and base are mixed, making test tube feel hot.
f. Solid dissolves into solution, making ice pack feel cold
Answer:
Ice melts into liquid water- endothermic
A process with a calculated positive q - endothermic
Wood burns in a fireplace - exothermic
A process with a calculated negative q - exothermic
Acid and base are mixed, making test tube feel hot - exothermic
Solid dissolves into solution, making ice pack feel cold - endothermic
Explanation:
An endothermic process is one in which heat is absorbed from the surroundings. The absorption of heat means that heat is removed from the surroundings hence the surroundings feel cool. When heat is absorbed, q is positive.
An exothermic process is one in which heat is released to the surroundings. The evolution of heat means that heat is released into the surroundings hence the surroundings feel hot . When heat is evolved, q is negative.
3. (Problem) Urea is a common fertilizer that is prepared by the reaction of ammonia with
carbon dioxide:
2 NH3(aq) + CO2(aq) → CHAN2O(aq) + H2O(1)
a) How many grams of urea can be formed from the reaction of 1.36 x 103
grams
ammonia?
b) How many grams of water will be produced when 1.3 moles of ammonia are reacted?
4. (Problem) The goal of these questions are to help you become comfortable with setting up
and solving stoichiometry questions quickly. The focus is ply on setting them up and
determining what information you need (molar mass of... etc).
Iron (III) oxide reacts with carbon monoxide according to the equation:
Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)
a) If 22.55 g Fe2O3 is reacted with excess CO, how many grams of iron can be made?
b) If we want to refine 10.0 kg of iron metal, how many moles of carbon monoxide gas do we
need?
c) If 2.50 moles of Fe2O3 is reacted with carbon monoxide, how many liters of carbon dioxide
gas form?
Answer:
3. B.
4. A.
Explanation:
Sana makatulong
Which trend is observed as the first four elements in Group 17 on the Periodic Table are considered in order of increasing atomic number?
1. Electronegativity decreases
2. First ionization energy increases
3. The number of valence electrons increases
4. The number of electron shells decreases
What is the iupac name for the compound shown?
Answer:Propanone is the IUPAC name for acetone, and butanone is the name for ethyl methyl ketone.
Explanation:
Warm air ___________________ and cold air __________________.
PLZ ILL GIVE BRAINLIEST!!!
Answer:
warm air rises and cold air decreases
Explanation:
cold: The absorbed energy moves and expands the molecules in the air, thus reducing the air density
hot: Hot air increases because it expands when you heat air.
Answer:
warm air rises and cold air decreases
Explanation:
cold: The absorbed energy moves and expands the molecules in the air, thus reducing the air density
hot: Hot air increases because it expands when you heat air.
15 The Following statement describes which body system? It also produces blood cells, and stores calcium. It regulates endocrine as well. This specific system uses all bones & joints in your body. A. The Lymphatic System B.The Muscular System C.The Reproductive System D.The Skeletal System
200 mL of water is added to 700 mL of a 3-M NaCl solution. What is the concentration of the diluted solution?
Answer:
2.3 M
Explanation:
First we calculate the final volume of the solution:
Final Volume = 200 mL + 700 mLFinal Volume = 900 mLWith the final volume we can use a dilution factor to calculate the concentration of the diluted solution:
Original Concentration * Initial Volume / Final Volume = Final Concentration3 M * 700 mL / 900 mL = 2.3 Mwhat is the volume in liters at 422K if n and P does not change?
Answer:
0.75 L
Explanation:
V1/T1 = V2/T2
V1 = 0.520 L
T1 = 18 C = 291 K (make sure to convert to Kelvin by adding 273 to the Celsius temperature)
V2 = ?
T2 = 422 K
Solve the equation for V2
V2 = V1T2/T1
V2 = (0.520 L)(422 K) / (291 K) = 0.754 L ≈ 0.75 L (since it says to only give two significant figures)
You are given a bottle of NaOH of an unknown concentration. You are tasked with determining the concentration of this solution. You weigh out 0.3175 g of KHP (MW = 204.2 g/mol) and dissolve it in 40 mL of water. You add phenolphthalein to the solution as an indicator. You preform your titration and determine that it requires 19.45 mL of the unknown NaOH solution to reach the endpoint. From this information, calculate the concentration of the unknown solution.
Answer:
0.07975 M NaOH
Explanation:
First determine the molarity of your acid, KHP. Convert grams to moles using the MW given and then divide by the volume of water.
0.3175 g KHP • (1 mol KHP / 204.2 g KHP) = 0.001555 mol KHP
0.001555 mol KHP / 0.040 L = 0.03888 M KHP
The reaction between KHP and NaOH is one-to-one, so you can just use M1V1 = M2V2 to solve for M2 (the molarity of NaOH).
M1 = 0.03888 M KHP
V1 = 40 mL
M2 = ? M NaOH
V2 = 19.45 mL NaOH
(0.03888 M KHP)(40 mL) = M2(19.5 mL NaOH)
M2 = 0.07975 M NaOH
Carbon 14 has a half-life of 5,730 years. If a sample contained 70 mg originally, how much is left after 17,190 years.
Answer: Mass after three decay is 8.75 mg
Explanation: if you divide 17190 by 5730 you see three decays has happened.
So you divide mass by two three times. 70 mg :2 = 35 mg, 35 mg :2 = 17.5 mg
And 17.5 mg:2 = 8,75 mg
The broadest taxonomic group for classifying living organisms is the blank
Answer:
Domain
Explanation:
The broadest taxonomic group for classifying living organisms is the kingdom," as taxonomy is the science of categorizing and classifying living organisms based on their characteristics and evolutionary relationships. So the second option is correct.
The taxonomic hierarchy allows scientists to systematically organize and classify the incredible diversity of living organisms on Earth. It also helps in understanding the evolutionary relationships and shared characteristics among different groups of organisms. The broadest level in the taxonomic hierarchy, the kingdom, represents the major categories of life. All living organisms on Earth are classified into one of these five kingdoms based on their fundamental characteristics.
Learn more about the hierarchy in the animal kingdom here.
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complete question is below
The broadest taxonomic group for classifying living organisms is the blank,
class,
kingdom,
species,
family
21 Organs consist of cells and tissues that have been adapted to perform a specific function in living organisms. The stomach is a muscular organ that is located on the left side of the upper abdomen. The stomach secretes acid and enzymes that help in the digestion of food. In simple terms, the stomach is a digestive sac. Even though the stomach has an important role in food digestion, it cannot perform the process all on its own. It depends on other organs such as the salivary glands, esophagus, liver, and intestines to help complete the process. Each organ has its own specific job, but together they make up an organ system. An organ system is a group of organs that work together to perform one or more functions. Which of the following describes the role of the immune system in the body? A. It gets rid of wastes that the body produces. B. It uses electrical signals to control body functions. C. It uses chemical messages to control body functions. D. It gets rid of pathogens that invade the body.
Answer:
The correct answer is - D. It gets rid of pathogens that invade the body.
Explanation:
Like all other organ systems, the immune system is an organ system that involves several special organs that helps in fighting any foreign object or infection that invades our body. This organ system produces specific cells or chemicals to fight or kill the microbes, and unnatural change takes place in the body.
The organs involved in the immune system are lymphocytes or white blood cells, the complement system, antibodies, the lymphatic system the thymus, bone marrow, and the spleen.
All these combinedly helps in fighting, killing the microbes or infections that occur in the body, and correct the physiological changes that occur in the body to get rid of pathogens that invade the body.
number of atoms per unit cell in face centred cube is
Answer: 4 atoms is the answer. I hope it helped you.
Explanation:
When 86.5 g of calcium chlorate decomposes into calcium chloride and oxygen, how many grams of oxygen are produced? Ca(ClO3)2 → CaCl2 + O2
Answer:
40.1 g
Explanation:
The balanced equation is:
Ca(ClO₃)₂ → CaCl₂ + 3O₂First we convert 86.5 g of calcium chlorate into moles, using its molar mass:
86.5 g Ca(ClO₃)₂ ÷ 206.98 g/mol = 0.418 mol Ca(ClO₃)₂Then we convert Ca(ClO₃)₂ moles into O₂ moles, using the stoichiometric coefficients of the balanced reaction:
0.418 mol Ca(ClO₃)₂ * [tex]\frac{3molO_2}{1molCa(ClO_3)_2}[/tex] = 1.254 mol O₂Finally we convert O₂ moles into grams:
1.25 mol O₂ * 32 g/mol = 40.1 g O₂water from a town is suspected to contain chloride ions but not sulphate ions . describe how the presence of the chloride ions in the water can be shown
Answer:
See Explanation
Explanation:
The presence of chloride ions in water can be established by adding dilute trioxonitrate V acid to a sample of the water in drops followed by aqueous silver trioxonitrate V.
If a white precipitate is formed, which is soluble in excess aqueous ammonia solution, then the presence of chloride ion in the water sample is ultimately confirmed.
What can be different between products and reactants in a balanced equation?
a) The total mass of products and reactants
b) The total moles of each element present in the reactants and in the products.
c) The number of molecules in the reactants and in the products
Answer:
b) The total moles of each element present in the reactants and in the products.
Explanation:
Hello there!
In this case, since the law of conservation of mass is used to realize that the mass, atoms and molecules of all the species involved in a chemical reaction must be the same at both reactants and products, we can see that a and c stand for those that must be equal; thus, we infer that the moles can be different as they stand for the amount of substance which is related to the mass via molar masses. Therefore, the answer would be b) The total moles of each element present in the reactants and in the products.
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How many atoms are in 6.78x1024 molecules of oxygen gas? PLEASE HELP WILL marK braNLIes
If I contain 2 moles of gas in a container with a volume of 30 liters and at a temperature of 337 K, what is the pressure inside the container?
Answer:
1.84
Explanation: just input the value into the formula pv=nrt
p*30=2*0.08206*337 then divide both sides by 30 and get 1.84
Help help help :/
Please
Need help answering the last two, Its urgent please show how
c) If 21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced?
Explanation:
21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced
0.500 mole of copper(II) sulfate contains
moles of O.
Answer:
2 mol
Explanation:
There are 4 mols of O per one sulfate so since there is only one sulfate you simply times 4 by .5 to get the number of mol
Which of the following is TRUE about most gases?
1) They expand to completely fill their container.
2) They cannot be compressed.
3) All of their particles are the same size.
4) They have a fixed volume.
5) Their particles are very close together.
Explanation:
I think it is the first option
Answer:
1) They expand to completely fill their container. :)
Explanation:
6. What is the number of moles of KF in a 29 gram sample?
a. 59.0 mols
C. 2.0 mols
b. 470 mols
d. 1684.9 mols
What product(s) would be formed when these are the reactants? BaF2 + Cl2
What phase will you see one week after
Answer:
yes.
Explanation:
Hotel: trivago
Can you spot the correct statement for CH4, H2CO, and CO2?
Answer:
The angle of the carbon bonds are different.