Answer
Fe2O3+3CO→2Fe+3CO2.
Explanation:
Can someone please answer this question please I really need to know
Answer: aging?
Explanation: sorry, i’m not too sure, but that would be my best guess.
which choice is an abiotic factor of an ecosystem?
A. minerals
B.fungi
C. ants
D.dogs
PLEASE HELP WILL GIVE BRINLY
Answer:
A. Minerals
Explanation:
Anything that is abiotic in nature is something that isn't living. Fungi is alive, so are dogs and ants.
Answer: Minerals is the correct answer.
Explanation: Sunlight, air, precipitation, minerals, and soil are some examples of abiotic factors. These factors have a significant impact on the survival and reproduction of species in an ecosystem. Answer is confirmed correct on the test. I hope this helps! Thanks!
CaCO3 + 2HCl→CaCl2+H2CO3 is an example of which type of reaction? Question 2 options: Single-Displacement Double-Displacement Combustion Decomposition
Answer:
Double replacement:
Explanation:
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AD +CB
Chemical equation:
CaCO₃ + 2HCl → CaCl₂ + H₂CO₃
The given chemical reaction is example of double displacement reaction. In this type of reaction cation and anion of both reactant exchange with each other. We can see carbonate ion of calcium carbonate combine with hydrogen ion of HCl and form carbonic acid while chloride ions of HCl combine with calcium ion and form calcium chloride.
All other options are incorrect because,
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Combustion reaction:
In combustion reaction substances are burned in the presence of oxygen.
Answer:
double-displacement
Explanation:
I took the test :)
You open the fridge and the milk is sour (spoiled). What has
happened?
O Observation of an extensive property
O Observation of a physical property
O A physical change.
O Achemical change
Answer:
D it's a chemical change
How is universal indicator different form an ordinary indicator
Answer:
Ordinary indicator only identifies weather a given solution is acidic or basic. Whereas an Universal indicator not only identifies the nature of the the solution, but also gives information about the pH of the solution, thus informing about the strength of the acid/base.
Answer:
A universal indicator is better than an ordinary indicator as it not only shows whether the solution is acidic or basic but also gives the pH values (approx.) by giving a wide range of colours corresponding to different pH values.
What is the standard model? What can it explain?
Answer:
The Standard Model of particle physics is the theory describing three of the four known fundamental forces (the electromagnetic, weak, and strong interactions, and not including the gravitational force) in the universe, as well as classifying all known elementary particles. It was developed in stages throughout the latter half of the 20th century, through the work of many scientists around the world, with the current formulation being finalized in the mid-1970s upon experimental confirmation of the existence of quarks.
Answer:
practice physical
Explanation:
The Standard Model of particle physics is the theory describing three of the four known fundamental forces in the universe, as well as classifying all known elementary particles.
Predict the product of Ca + H2O (Single Replacement). If y'all can add an explanation as well, that would be much appreciated!!
Answer:
Ca + H2O------->CaO+H2
since ca combine with oxygen.
If 3.75 moles of aluminum react, how many moles of sulfur are needed?
16 Al + 3S8 --> 8Al2S3
0.70 mol
0.050 mol
20 mol
16 mol
Answer:(A) 0.70 mol
Explanation:
The moles of sulfur needed would be 0.7.
From the equation of the reaction, the mole ratio of Al to S8 is 16:3, meaning that for every 16 moles of Al, 3 moles of S8 would be required.
Thus, if 3.75 moles of Al react, the mole of S8 that would be required can be calculated as:
16 moles of Al = 3 moles of S8 3.75 moles of Al = ?= 3 x 3.75/16
= 0.7 moles
More on moles can be found here: https://brainly.com/question/15209553?referrer=searchResults
Which two statements must be true to define a species?
O A. Organisms must be able to produce offspring that can also
reproduce.
O B. Organisms must be found in the same place on Earth.
O C. Organisms must be a common ancestor to another organism.
OD. Organisms must have very similar DNA.
SUBMIT
Answer:
The 2 statements would be A and C.
Answer:A, organisms must be able to produce offspring that can also reproduce and D, organisms must have very similar DNA
Explanation: took the quiz and got it right a p e x
Which feature is forming?
mountain
rift valley
earthquake
island chain
for the reaction
2Cl2 + 4NaOH → 3NaCl + NaClO2 + 2H2O,
how many grams of NaCl can be produced from 4.45g of Cl2 and excess NaOH?
:( please help..i need to turn this in later
i will mark you brainless
Answer:
Mass = 5.56 g
Explanation:
Given data:
Mass of Cl₂ = 4.45 g
Mass of NaCl produced = ?
Solution:
Chemical equation:
2Cl₂ + 4NaOH → 3NaCl + NaClO₂ + 2H₂O
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 4.45 g/ 71 g/mol
Number of moles = 0.063 mol
Now we will compare the moles of Cl₂ with NaCl.
Cl₂ : NaCl
2 : 3
0.063 : 3/2×0.063 =0.095 mol
Mass of NaCl:
Mass = number of moles × molar mass
Mass = 0.095 mol × 58.5 g/mol
Mass = 5.56 g
List at least one cause of chemical weathering.
Answer:
Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals clays and soluble salts. These reactions occur particularly when the water is slightly acidic.
Explanation:
Calculate the density of a material that has a mass of 56.6 g and a volume of 17.2 cm
Answer:
d = 3.29 g/cm³
Explanation:
Given data:
Density of material = ?
Mass of material = 56.6 g
Volume of material = 17.2 cm³
Solution:
Formula;
d = m/v
d = density
m = mass
v = volume
by putting values,
d = 56.6 g/ 17.2 cm³
d = 3.29 g/cm³
How many grams of argon would it take to fill a large light bulb with a volume of 0.745 L at STP?
A) 1.33 g
B) 0.0332 g
C) 0.846 g
D) 19.0 g
Answer:
Mass = 1.33 g
Explanation:
Given data:
Mass of argon required = ?
Volume of bulb = 0.745 L
Temperature and pressure = standard
Solution:
We will calculate the number of moles of argon first.
Formula:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
By putting values,
1 atm ×0.745 L = n × 0.0821 atm.L/mol.K× 273.15 K
0.745 atm. L = n × 22.43 atm.L/mol
n = 0.745 atm. L / 22.43 atm.L/mol
n = 0.0332 mol
Mass of argon:
Mass = number of moles × molar mass
Mass = 0.0332 mol × 39.95 g/mol
Mass = 1.33 g
4. What holds a moon in its orbit? *
How many liters of water are needed to prepare a 1.67M solution of Ba(OH)2 if you need to dissolve 235g of it?
Answer: 2.04
Explanation:
Answer:
Approximately [tex]0.821\; \rm mol[/tex].
Explanation:
Look up the relative atomic mass of [tex]\rm Ba[/tex], [tex]\rm O[/tex], and [tex]\rm H[/tex] on a modern periodic table:
[tex]\rm Ba[/tex]: [tex]137.327[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex].Calculate the formula mass of [tex]{\rm Ba(OH)_2}[/tex]:
[tex]\begin{aligned}& M({\rm Ba(OH)_2}) \\ &= 137.327 + 2\times(15.999 + 1.008) \\ &\approx 171.334\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
Calculate the number of moles of [tex]{\rm Ba(OH)_2}[/tex] formula units in that [tex]235\; \rm g[/tex] of this compound:
[tex]\begin{aligned}& n({\rm Ba(OH)_2}) \\ &= \frac{m({\rm Ba(OH)_2})}{M({\rm Ba(OH)_2})} \\ &= \frac{235\; \rm g}{171.334\; \rm g \cdot mol^{-1}} \approx 1.37159\; \rm mol \end{aligned}[/tex].
Calculate the volume of a [tex]c({\rm Ba(OH)_2}) = 1.67\; \rm mol \cdot L^{-1}[/tex] with approximately [tex]n({\rm Ba(OH)_2}) = 1.37159\; \rm mol[/tex] of the solute:
[tex]\begin{aligned}& V({\rm Ba(OH)_2}) \\ &= \frac{n({\rm Ba(OH)_2})}{c({\rm Ba(OH)_2})} \\ &= \frac{1.37159\; \rm mol}{1.67\; \rm mol \cdot L^{-1}} \approx 0.821\; \rm L \end{aligned}[/tex].
HELP ASAP PLEASE!!!!!!
Answer: yellow ? i’m sorry if i’m not right
Explanation:
PLZZZZZZZZZZZZZZZZZZ15. As much as 90 percent of the oxygen in our atmosphere is the result of
a. photoperiodism
c. thigmotropism
b. respiration
d. photosynthesis
Answer:
The correct answer is - option D. photosynthesis.
Explanation:
It is shown by the study that most of the atmospheric oxygen comes from the photosynthesis by plants as oxygen is the byproduct of the photosynthesis. Photosynthesis is the process that uses light energy, carbon dioxide, and water to produce food or glucose/sugar and release oxygen as the byproduct.
Many scientists believe that oceanic phytoplankton that releases oxygen by the photosynthesis process makes 80 to 85% of the total oxygen of the atmospheric oxygen.
Answer:
D. photosynthesis.
Explanation:
I need help ASAP pls
CHEMISTRY HELP ASAPP
HELP ASAP
Pleaseeeeeeeeee
Answer:
avery
Explanation:
Answer:
avery is more faster.
Explanation:
reese's speed = 10/5 = 2km/hr
reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hr
reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hrby seeing their speeds we can easily tell that avery is more faster than reese ...
Which coefficients will balance this equation? *
Ag +
C2 >
AC2
Answer:
16Ag + 2C2 ---> 4 Ag4C
Explanation:
Ag + C2 ----> AgC2
The valence of Ag is one
Valence of Carbon is four
A balanced equation would be
16Ag + 2C2 ---> 4 Ag4C
how might some organelles in a cell
be compared to an Assembly line.
how many moles of iron are in 250 g
4.5 mol Fe
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
250 g Fe
Step 2: Identify Conversions
Molar Mass of Fe - 55.85 g/mol
Step 3: Convert
[tex]\displaystyle 250 \ g \ Fe(\frac{1 \ mol \ Fe}{55.85 \ g \ Fe} ) = 4.47628 \ mol \ Fe[/tex]
Step 4: Check
Follow sig fig rules and round; given 2 sig figs.
4.47628 mol Fe ≈ 4.5 mol Fe
How many atoms are in 5.9g of lithium carbonate, Li2(CO3)?
The number of atoms = 4.8 x 10²² atoms
Further explanationGiven
5.9 g of Lithium carbonate
Required
The number of atoms
Solution
mol Lithium carbonate(MW=73.9 g/mol) :
= mass : MW
= 5.9 g : 73.9 g/mol
= 0.08
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So for 0.08 mol :
= 0.08 x 6.02.10²³
= 4.8 x 10²² atoms
The systematic name for
CH3CH2C=CH2
CH?
a) 3-methylbutane
b) O2-methylbutane
c) 02-metrybut-1-ene
d) 3-methylbutiene
Answer: I’m sorry if I’m wrong but I think the answer would be a) 3-menthylbutane. Again, if I’m wrong I am very sorry. Hope this helps❤️
how are the atomic mass number of an element and the stability of the nucleus of the atom related?
Answer:
An atomic Nucleus consists of protons and Neutrons, collectively called nucleons.These stable nuclides Occupy a narrow band of stability on a graph of number of protons versus number of neutrons. The binding energy per nucleon is largest for the elements with mass numbers near 56; These are the most stable nuclei.
HELP!!! What has 5 valence electrons and is in period 3 on the periodic table?
Answer:
-182
+281
116ueuehehheue
Mechanical waves don't require a medium.
True. Mechanical waves are able to travel through air, water and solids.
It depends on the type of mechanical wave.
False. Mechanical waves cannot travel through a vacuum.
True, but only medium mechanical waves need a medium.
Answer: False. Mechanical waves cannot travel through a vacuum.
Explanation:Type of wave that can travel through the vacuum of space - DOES NOT require a medium. ... False: A vacuum is empty space (no matter). Sound waves must have a medium (matter) in order to travel. Sound waves are mechanical waves.
Which substances are acids? Check all that apply.
AgOH
HF
NiOOH
NH4OH
HMnO4
Zn(OH)2
Answer:
Explanation:
Hope this helps:
AgOH is silver hydroxide
HF is hydrofluoric acid
NiOOH is nickel oxide hydroxide
NH4OH is ammonium hydroxide
HMnO4 is Permanganic acid
Zn(OH)2 is zinc hydroxide
Answer:
HF
HMnO4
Explanation:
bc i know everything
