Answer:
Please mention elements so i can answer it
Explanation:
Which of the following measurements are required to find the work done on an object?
1. The mass and volume of the object
2. The volume of the object and the distance the object moved
3. The force exerted on the object and the distance the object moved
4. The force exerted on the object and the time it took to move the object
Answer:
1.p=mV................
What is the asthenosphere?
Question 3 options:
The hot, rigid inner part of the upper mantle which can’t flow
The hot, weak inner part of the upper mantle which can flow
The hot, weak outer part of the lower mantle
None of the above
Answer:
None of the Above
Explanation:
The Athenosphere is able to flow but is also part of the UPPER LAYER meaning none of these choices are correct
whats the number of moles of O2(g) needed to completely react with 8 moles of CO(g).
I NEED HELP ASAPPP PLZ
1. Heat needed = 293.25 J
2. Time to leave : 2 s
Further explanationGiven
1.5 g H2
Cp H2 = 14.27 g/J C
Δt= 13.7
Required
1. Heat needed
2. Fridge time
Solution
1. Heat can be formulated :
Q = m.c.Δt
Q = 1.5 x 14.27 x 13.7
Q = 293.25 J
2. Heat decreases = 150 J/s, so for 293.25 J :
[tex]\tt t=\dfrac{293.25~J}{150~J/s}=1.955~s\approx 2~s[/tex]
In the modern periodic table, which of the following represents the last pair of elects for which Newlands' Law of Octaves would hold true?
1. AI and GA
2. AI and SI
3. NE and AR
4. MG and CA
Answer: Mg and Ca
Explanation:
In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.
Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.
In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.
Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.
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balance:
_H3[PO4] —> _H4[P2O7] + _H2O
Answer:
2
Explanation:
Answer:
2H3[PO4] —> H4[P2O7] + H2O
Explanation:
urgent plzz help meeee thx I HAVE EXAMEEE
Answer: [tex]2Ag^{+}(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
Explanation:
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The given chemical equation is:
[tex]2AgF(aq)+Na_2CO_3(aq)\rightarrow Ag_2CO_3(s)+2NaF(aq)[/tex]
The complete ionic equation is;
[tex]2Ag^{+}(aq)+2F^-(aq)+2Na^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)+2Na^+(aq)+2F^-(aq)[/tex]
The ions which are present on both the sides of the equation are [tex]Na^+[/tex] and [tex]F^-[/tex] and are not involved in net ionic equation.
Hence, the net ionic equation is :
[tex]2Ag^{+}(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
describe how calcium may be used in the body
In case you don't know what Calcium Is:
a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
Calcium can be found:
Calcium is a soft white chemical element found in bones and teeth
answer:
Using the definition..calcium may be used in the human body by nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
·.•·°.hope this helped!!!·.•·°.
please help!! i am struggling with this. first correct answer gets brainliest!
Answer: [tex]1.25dm^3[/tex] of unreacted oxygen is left.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given volume}}{\text{Molar Volume}}[/tex]
[tex]\text{Moles of} CO_2=\frac{3.60dm^3}{22.4dm^3}=0.161moles[/tex]
[tex]\text{Moles of} O_2=\frac{7.25dm^3}{22.4dm^3}=0.324moles[/tex]
[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(l)[/tex]
According to stoichiometry :
3 moles of [tex]CO_2[/tex] = 5 moles of [tex]O_2[/tex]
Thus 0.161 moles of [tex]CO_2[/tex] =[tex]\frac{5}{3}\times 0.161=0.268moles[/tex] of [tex]O_2[/tex]
moles of [tex]O_2[/tex] left unreacted = (0.324-0.268) = 0.056
Volume of [tex]O_2[/tex] left unreacted = [tex]moles\times {\text {Molar volume}}=0.056mol\times 22.4dm^3/mol=1.25dm^3[/tex]
Thus [tex]1.25dm^3[/tex] of unreacted oxygen is left.
Given: 36.7 grams of CaF2 is added to 300 mL water. Find molarity?
2 M
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Unit 0
Reading a Periodic TableUsing Dimensional AnalysisAqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:Step 1: Define
36.7 g CaF₂
300 mL H₂O
Step 2: Identify Conversions
Molar Mass of Ca - 40.08 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of CaF₂ - 40.08 + 2(19.00) = 78.08 g/mol
1000 mL = 1 L
Step 3: Convert
Solute
Set up: [tex]\displaystyle 36.7 \ g \ CaF_2(\frac{1 \ mol \ CaF_2}{78.08 \ g \ CaF_2})[/tex]Multiply: [tex]\displaystyle 0.470031 \ mol \ CaF_2[/tex]Solution
Set up: [tex]\displaystyle 300 \ mL \ H_2O(\frac{1 \ L \ H_2O}{1000 \ mL \ H_2O})[/tex]Multiply: [tex]\displaystyle 0.3 \ L \ H_2O[/tex]Step 4: Find Molarity
Substitute [M]: [tex]\displaystyle x \ M = \frac{0.470031 \ mol \ CaF_2}{.3 \ L \ H_2O}[/tex]Divide: [tex]\displaystyle x = 1.56677 \ M[/tex]Step 5: Check
Follow sig fig rules and round. We are given 1 sig fig as our lowest.
1.56677 M ≈ 2 M
Why does the mass of steel wool increase after getting burned? Help pls
Answer:
heat and large amount of surface area
Explanation:
the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool
The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.
After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.
The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.
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Consider the compounds Cl2, HCl, F2, NaF, and HF. Which compound has a boiling point closest to that of argon? Explain how you came up with your answer.
Answer:
Cl2, Chlorine molecule has a boiling point closest to that of argon.
This is because Chlorine is made up of discrete and simple molecules making up a simple molecular structure. The molecules associate through weak van der waal's forces of attraction hence low boiling point.
HCl has strong hydrogen bonds.
F2 is very small hence strong forces of attraction.
HF has strong hydrogen bonds
What most accurately explains whether liquid water or ice has a higher density, and why?
A) Ice has a higher density. Substances are always denser as solids than they are as liquids because the particles of solids have less energy to move and crowd closer together.
B) Liquid water has a higher density. Substances are always denser as liquids than they are as solids because the vibrations of solid particles create larger gaps between them.
C) Liquid water has a higher density. Ice crystals have an open hexagonal structure with some empty space in the middle, while liquid water does not.
D) Ice has a higher density. Solid ice has strong hydrogen bonds that hold the particles closer together, while liquid water does not form hydrogen bonds.
Answer:
I think your answer is either b or c but I think b is more likely to be your answer
Which of the following were conclusions based on Rutherford's gold foil experiment? Choose ALL that apply.
A) atoms contain a nucleus
B) Electrons have a mass much greater than that of protons
C) the mass and positive charge of an atom is concentrated in a small space in the center of the atom
D) most of the atom is empty space
Answer:The alpha particles that were fired at the gold foil were positively charged. ... These experiments led Rutherford to describe the atom as containing mostly empty space, with a very small, dense, positively charged nucleus at the center, which contained most of the mass of the atom, with the electrons orbiting the nucleus.
Explanation:Thomson's cathode ray experiment and Rutherford's gold foil experiment. ... that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. ... mass of each particle was much, much smaller than that of any known atom. ... Why did Thomson conclude that electrons could be found in atoms of all elements?
Which of the following shows the correct order of the inner planets?
A: Mercury, Earth, Venus, Mars
B: Mars Mercury Venus Earth
C: Venus, Mars, Erath, Mercury
D: Mercury, Venus, Earth, Mars
Mercury, Venus, Earth,Mars
Answer:
D: Mercury, Venus, Earth, Mars
Explanation:
Both prokaryotes and eukaryotes have small, free-floating organelles. The cell makes these organelles from nucleic acids and amino acids found in food. Without these organelles, the cell could not make proteins. What are these organelles called? A. chloroplasts B. mitochondria C. ribosomes D. vesicles
Answer:
C. ribosomes
Explanation:
Both prokaryotic and eukaryotic cells contain certain structures called ORGANELLES. They possess some in common and others are not found in one or the other. According to this question, a small, free-floating organelle made from nucleic acid and amino acid is found in both eukaryotes and prokaryotes. This organelle is RIBOSOMES.
Ribosomes are organelles responsible for the synthesis of protein in both eukaryotes and prokaryotes. They can be found free-floating or attached to endoplasmic reticulum. Ribosomes are predominantly made of RNA (nucleic acid) and proteins i.e. Ribosomal RNA (rRNA) and proteins is their structural constituent. Hence, the organelle in this question is RIBOSOME.
lactic acid is produced from pyruvate by an anaerobic process called
A. protonation
B. fermentation
C. glycolysis
D. phosphorylation
Pls help me thank you
Answer:
B. fermentation
Explanation:
this process is called lactic fermentation where a molecule of gluclose(C6H12O6) is turned into two molecules of pyruvate(C3H4O3) and the pyruvate molecules are turned into lactic acid(C3H6O3) from this process two molecules of ATP are resulted
Answer:
Fermentation
Explanation: I took the test
Complete this sentence: The mitochondrion is the place in the cell where ________________.
sunlight is absorbed to produce energy
cellular respiration takes place
photosynthesis takes place
energy is converted to waste
Answer:
cellular respiration takes place
Answer:
sunlight is absorbed to produce energy
Sorry if its worng
URGENT!! Can someone please explain this to me?
2CH4 + 2O2 → CO2 + 2H2O
If 7.4 moles of carbon dioxide (CO2) form at the end of the reaction, how many moles of methane (CH4) and oxygen gas (O2) entered the reaction?
__ moles of methane and __ moles of oxygen gas
Answer:
[tex]CH _{4}+ 2O _{2} → CO _{2} + 2H _{2}O[/tex]
for the balanced equation
[tex]from \: the \: equation \\ 1 \: mole \: of \: methane \: gives \: 1 \: mole \: of \: carbon \: dioxide \\ 7.4 \: moles \: of \: carbon \: dioxide \: will \: be \: given \: by \: (7.4 \times 1)moles \: of \: methane \\ = 7.4\: moles \: of \: methane \\ \\ since \: moles \: of \: oxygen \: double \: those \: of \: methane \\ moles \: of \: oxygen \: = 7.4\times 2 \\ = 14.8 \: moles \: of \: oxygen[/tex]
Suppose you have 28.9 grams of elemental germanium, what mass would be the isotope germanium - 72?
34.5 grams
because the mass would multiply and do mass things
(Please help, ASAP) How many grams are in 3.45x10^23 atoms of P?
one mole of P weights about 31 grams
in one mole there are 6.022*10^23 atoms
we use the rule of threes
6.022*10^23atoms......weight..........31 grams
3.45*10^23 atoms.........weight...........x grams
x=(3.45*10^23*31)/6.022*10^23
x=106.95/6.022=17.76 grams
Which of the following processes will contribute most tot he development of soil?
A. Absorbing of sunlight by plants
B. Migration of animals
C. Evaporation of ocean water
D. Weathering of rocks
Answer:
B - migration of animals
Weathering of rocks will contribute most to the development of soil.
Weathering is the process in which rock particles are broken down into
smaller parts.
The smaller parts results in soil formation and is carried out through
physical and chemical factors.
The physical factors include:
AbrasionThermal expansionFreezing and thawing of rocksThe chemical factors include:
CarbonationAcidification etcRead more about Weathering here https://brainly.com/question/829782
how many meteor showers does the earth pass through as it orbits the sun?
Answer:
about 30 meteor showers
Explanation:
Lab Report: Types of chemical reactions
Answer:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.
Answer:
SEE BELOW HEHEHE YOURE WELCOME
Explanation:
Types of Chemical Reactions
The purpose of this experiment was to make observations of the reactants and products and then later use this information to write a balanced chemical equation. My question before this experiment was how will the reactants affect the products. The hypothesis I made before this experiment was that based off of the materials being used, a gas will form, and so will a solid. I still do not know what the variables are in this experiment such as the independent or dependent.
The materials used in this experiment were:
Bunsen Burner
Striker
Tongs
Test Tube
Test Tube Rack
Test Tube Holder
Spatula
Sand Paper
Transfer Pipette
Tweezers
Evaporating dish
The substances used in this experiment were:
Copper wire
Sodium carbonate
Copper sulfate
Potassium iodide
Lead nitrate
Zinc
In this experiment we started off by placing about 20 drops of copper sulfate solution into a test tube and then put zinc into the test tube and watched it as single replacement occurred and zinc sulfate was the product.Next we put 10 drops of potassium iodide into another test tube and 10 drops of lead nitrate into a separate test tube. Then we added the lead nitrate into the potassium iodide and watched as double replacement occurred as lead iodide formed and potassium nitrate formed as well. Next, I sanded down a piece of 3-inch copper wire until it was shiny and watched as combustion and synthesis occurred when we held the piece of copper over a bunsen burner. Copper oxide was found formed on the wire. The other reactant in this equation was oxygen gas. After this, we used a small spatula to place about half an inch of sodium carbonate in a clean test tube and then heated the tube over the flame and watched as decomposition took place and carbon dioxide was released. The reaction was a gas formation and 2 products were formed. This was the lab experiment.
Based on this experiment and my hypothesis made beforehand, my hypothesis was almost correct other than the fact that I did not think that color change would occur so I was surprised by that. But other than that, my data did support my hypothesis showing that a gas and a solid were formed in two different ways. One error I made was when I was recording the data in a data table, I did not notice a color change at first but I rewatched the experiment. One way that I could have improved this lab investigation was pay more attention to the precise details because those make a huge difference.
4. What are the PRODUCTS of the chemical reaction pictured?
+
CH4
+
202
CO2
+ 2H20
A. CHand CO2
O B. CO, and H2O
Answer:
CH4 =Methane (one atom of carbon and four atoms of hydrogen). It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
202= Oxygen.
CO2= Carbon dioxide (one Carbon atom and two oxygen atom)
2H20= 2H2O means two molecules of water(H2O)
CH and CO2= the main difference between CO2 and CO2e is that CO2 only accounts for carbon dioxide, while CO2e accounts for carbon dioxide
CO= Carbon monoxide (CO), a colorless, odorless, and tasteless gas. Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O.
H2O = water ( one hydrogen atom and two oxygen atoms)
Why are there multiple types of ramps in the park?
Answer:
Each person has their own skill level. The smaller ramps are less risky and are for more beginner to amateur skaters. The larger ones are very risky but can be very nice if a person does tricks with it. They are geared for more experienced skaters. Different ramps allow for more people to hace fun skating without the risk of injury...
During ionic bonding, there is a transfer of electrons....
O from one metallic element to a different metallic element
O from one nonmetallic element to a different nonmetallic element
O from one metallic element to a different metalloid
O from one metallic element to a different nonmetallic element
help plz will mark brainliest xD
Answer:
Ions are atoms that have either gain or lose electrons from the neutral atom.
A loss of electrons results in a positive ion, called a cation, a gain of electron results in a negative ion called an anion.
Ionic compounds are formed by the combination of a cation and anion, or metal + nonmetal.
When naming ionic compounds, name the cation first, and the anion second, changing the ending to ide.
Explanation:
Hope it helped!
Answer:
• [ lost ] or [ gained ]
• [ cation ], [ anion ]
• [ metal ] + [ non-metal ]
• [ cation ] and the [ anion ] to [ compound with suffix "ide" or "ode" ]
A reaction occurs in a calorimeter that heats up 15g water from 25 oC to 50 oC. The specific heat of water is 4.184 J/goC. Determine the thermal energy (Q) that must have entered the water to produce this temperature change.
The thermal energy (Q) needed : = 1882.8 J
Further explanationGiven
15g water from 25 °C to 50 °C
Required
The thermal energy (Q)
Solution
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Input the value :
Q = 15 g x 4.184 J/g°C x (50 °C- 20 °C)
Q = 1882.8 J
non polar and polar substances don't mix because of
Explanation:
The molecules in the solute and solvent are only able to make dispersion forces with each other (as they aren't both polar). This only releases very little energy. Therefore overall, more energy is required than released and hence they won't mix.