Answer:
C
Explanation:
In 1953 they made soundings and discovered the ocean ridges
What is the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrichloric acid andb142 grams of calciym chloride is obtained
Answer:
375 grams
Explanation:
The percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%
What is percent yield?Percent yield is defined as the amount of product actually made compared with the maximum calculated yield. It is the ratio of actual yield to the theoretical yield.
Mass of calcium carbonate = 155 g
Mass of HCl = 250g
Mass of calcium chloride product = 142 g
Moles of calcium carbonate = 155 / 100 = 1.55 moles
Moles of HCl = 250 / 36.5 = 6.85 moles
Mass of calcium chloride = Moles x Molar mass
= 1.55 mole x 111 g/ mole
= 172 g /mole
Theoretical yield = 172 g
Actual yield = 142 g
Percent yield = Actual yield / Theoretical yield x 100
= 142 / 172 x 100
= 82.55 %
Thus, the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%
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85miles/hours south is an example of? this is science btw
Answer:
I believe it's an example of velocity
Explanation:
This is because 85miles/hour south is giving both magnitude (85miles/hour) and direction (south)
What happens to ions during bonding to form an ionic compound? O Cations accept electrons and anions give away electrons. O Anions and cations share electrons. O Cations give away electrons and anions accept those electrons.
Answer:
Last one: Cations give away electrons and anions accept those electrons.
Explanation:
Just did it
Answer:
D
Explanation:
"Cations give away electrons and anions accept those electrons."
Is Aushtin dating Summer please help
Answer:
uhm yes he made her pump go off
Explanation:
What are some molecular compounds that we use in everyday life and their products?
Ex: Kirkland water - dihydrogen monoxide; H2O
Answer:
Water. Chemical Formula: H2O.
Table Salt. Chemical Formula: NaCl.
Sucrose (Sugar) Chemical Formula: C12H22O11.
Soaps. Chemical Formula: RCOO–Na, Where R is a long chain of carbon atoms ranging from 16-18 in number.
Toothpaste. Chemical Formula: CaCO3 or NaF.
Explanation:
Which of the following is NOT one of the four pieces of evidence Wegener
used to validate his continental drift hypothesis?
Current global warming trends
O Apparent fit of the continents as a "puzzle"
O Past climate of the Earth seen in glaciers
O Correlation of fossils
Correlation of rocks and mountains
Why are yeast cells used in making bread?
Answer:
Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.
Explanation:
Which elements from the periodic table are the least reactive?
A noble gases
B transition metals
C lanthanides
Dmetalloids
Answer:
Noble games are the least reactive because their outer shells are already full with 8 electrons.
Which statement best describes how deflating a soccer ball is evidence of matter?
a) The ball changes shape from round to flat.
b) The ball increases size and shape.
c) The mass of the ball has increased.
d) The temperature outside the ball has changed.
Answer:
The temperature outside the ball has changed
The number of grams in 2.56 x 1025 molecules of HCl are
Answer:
1569.5g
Explanation:
Given parameters:
Number of molecules = 2.56 x 10²⁵
Unknown:
Mass of HCl = ?
Solution:
To solve this problem, let us find the number of moles first;
Number of moles = [tex]\frac{number of particles}{2.56 x 10^{25} }[/tex]
So,
Number of moles = [tex]\frac{2.56 x 10^{25} }{6.02 x 10^{23} }[/tex] = 0.43 x 10² = 43mol
Now;
Mass of HCl = number of moles x molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl = 43 x 36.5 = 1569.5g
Which question can be used to identify a physical property of an element?
Does a magnet attract the element?
Does rust form when the element is exposed to oxygen?
Do bubbles form when the element is mixed with an acid?
Does the element burn when held over a Bunsen burner flame?
Answer:
Does a magnet attract the element?
Explanation:
This is because, the attraction of an element by a magnet is a purely physical property. It has to do with the orientation of the electrons in the element. It does not tell us of the composition of the element or how it reacts with other elements. Whereas, the other questions deal with the chemical properties of the element. That is, how it reacts with other elements or substances.
2KCI -> K + CI2
balanced or unbalanced pls help
Answer:
unbalanced I know you should know to
Please I'm begging for help. I'll give you ALL MY POINTS. JUST PLEASE HELP.
Worksheet: Balancing Equations
Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3
2. C3H8 + O2 CO2 + H2O
3. P4 + O2 P2O3
4. KNO3 KNO2 + O2
5. O2 + CS2 CO2 + SO2
6. KClO3 KCl + O2
7. N2 + H2 NH3
8. NaF + Br2 NaBr + F2
9. Al + HCl H +AlCl3
10. WO3 + H2 W + H2O
Answer:
Explanation:
A Chemical Equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while Products are the new substances that are formed. The large numbers in front of some of the formulas are called Coefficients. These numbers are used to Balance the equation because chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be Equal because matter cannot be Created or Destroyed. When balancing equations, the only numbers that can be changed are Coefficients; remember that Subscripts must never be changed in order to balance an equation.
Q1) 4Al + 3O2 ---> 2Al2O3
Q2) C3H8 + 5O2 -----> 3CO2 + 4H20
Q3) P4 + 3O2 -----> 2P2O3
Q4) 2KNO3 -----> 2KNO2 + O2
Q5) 3O2 + CS2 ------> CO2 + 2SO2
Try the rest out and tell me did you understand it?
What are the units for the mass of aluminum sulfide
The units for the mass of aluminium sulphide is g/mol.
What is aluminium sulphide?Aluminium sulphide is a chemical compound with the formula Al2S3 and has the mass of 150.158 g/mol.
What are units?A unit is a standard that are used for making comparisons in measurements.
Unit conversions allow for measurements of a property that have been recorded using different units like centimetres to inches.
Hence, the units for the mass of aluminium sulphide is g/mol.
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How many oxygen atoms are in 5 moles of water H2O molecules?
Answer:
I think 20
Explanation:
Becu of science
A solution is classified as a weak base. Which of these could be the pH of the solution?
A)2
B)6
C)10
D)13
C
Pure water is at 7, and the bases are above 7 and the acids are below 7.
The pH of the solution that is classified as a weak base is 10. Details about weak bases can be found below.
What is pH?pH of a solution refers to the degree of acidity or alkalinity of that solution.
The pH scale reads from 1 - 14 where the following applies:
1 - 6 represents acidic solution7 represents neutral8 - 14 represents alkaline solutionA weak base will have a pH close to neutral, therefore, the pH of the solution that is classified as a weak base is 10.
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Question 4 (2 points)
Photosynthesis takes place in the nucleus of cells. (2 points)
O True
O False
false
Explanation:photosynthesis takes place inside an organelle called a chloroplast. For plants, chloroplast-containing cells exist in the mesophyll.
A kid walking around with a balloon on a summer day when the temperature outside is 300 k contains the volume of 4 l goes into a walk in freezer with a temperature of 275 k to get an ice cream What will be the new volume to the balloon
Answer:
3.67 L
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T1) = 300 K
Initial volume (V1) = 4 L
Final temperature (T2) = 275 K
Final volume (V2) =?
Thus, we can obtain the final volume (i.e the new volume) of the balloon by using the Charles law equation as shown below:
V1 /T1 = V2 /T2
4/300 = V2/275
Cross multiply
300 × V2 = 4 × 275
300 × V2 = 1100
Divide both side by 300
V2 = 1100 / 300
V2 = 3.67 L
Therefore, the new volume of the balloon is 3.67 L
If the value of mass doubles but the volume stays the same, the value for density will be
Answer:
if the value of volume doubles but the mass stays the same, the value for density will be 1
How did mossely esablish a more accurate periodic table
Explanation:
arranged by their number of protons rather than their atomic mass
ASAP please and Thankyou
How does heat transfer work?
Answer:
Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules
Explanation:
The prophet Isaac was chosen to lead the Israelites after the death of Abraham.
O True
O False
A student prepared this table to gather information about digestion. Digestion of Food Column A Column B Physical Changes Chemical Changes The results of which investigation would be entered in Column A of the table? A. How do mitochondria release the energy in food molecules? B. Which type of teeth are most important in crushing food? C. What chemicals in the stomach are most important in breaking down proteins? D How do substances released by the pancreas affect the rate of digestion?
Answer:
B. Which type of teeth are most important in crushing food?
Explanation:
According to the question physical changes ought to be entered into column A while chemical changes ought to be entered into column B.
The crushing of food is a physical change. It does not involve any chemical transformation of the food material.The other options involve some sort of chemical transformation taking place on the food material being digested.
Which of the following accurate describes the atmospheric conditions required for the formation of clouds
Answer:
To make a cloud, air needs only to be cooled to saturation and beyond. ... Usually the water vapor amounts in air are less that this amount. When this is the case, we describe the air as being unsaturated. If we add more vapor to such air, we could reach the maximum for the temperature
Explanation:
The atmospheric conditions required for the formation of clouds are , air needs only to be cooled to saturation and beyond formation of clouds and precipitation.
What is precipitation?
Precipitation is defined as any liquid or frozen water which forms in the atmosphere and then gets received on Earth.It is one of the most important steps of the water cycle.
Precipitation takes place in form of clouds when water vapor gets accumulated in clouds and they get bigger and heavy, when the clouds become heavy enough they fall to the land in the form of rain.f a cloud is present at higher altitudes , the water present in the clouds freezes and fall to the ground in form of snow,hail.
Precipitation occurs always in case of fresh water because the sea salt does not evaporate with the water.The different types of precipitation are rain, drizzle,snow,snow hail,etc.
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HELP ASAP - How much energy is lost when 80.0 grams of steam at 100.C turns into liquid water at 100.C?
Answer:
Q = 43,000 calories = 180,000 joules = 180 Kilojoules
Explanation:
Heat flow for phase change can be defined as Q = m·ΔHv
ΔHv = Heat of Vaporization for water = 540 calories/gram = 2259 joules/gram = 2.259 Kilojoules/gram
m = mass of object of interest ( in this problem 80 grams steam 100°C converting to 80 grams of water at 100°C
Q = m·ΔHv = 80g x 540 cals/g =43.200 calories x 4.184 joules/cal = 180,748.8 joules (calculator answer) => 180,000 joules (2 sig. figs.) = 180 Kj
ASAP pleaseee and Thankyou
Single celled prokaryotic cells use meiosis to reproduce.
TRUE
FALSE
Answer:
True
Explanation:
Single celled prokaryotic cells use meiosis to reproduce. Its ''TRUE''
What is a Prokaryotic cell ?A prokaryote is a single-celled organism that lacks a nucleus, and other membrane-bound organelles.
Prokaryotic cells are single-celled microorganisms known to be the earliest on earth.
Prokaryotes include Bacteria and Archaea.
The photosynthetic prokaryotes include cyanobacteria that perform photosynthesis.
A prokaryotic cell consists of a single membrane and therefore, all the reactions occur within the cytoplasm.
Prokaryotes reproduce through a cell division process called binary fission.
Like mitosis in eukaryotes, this process involves copying the chromosome and separating one cell into two.
Hence, Single celled prokaryotic cells use meiosis to reproduce is a ''TRUE'' statement.
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Give reasons for : The empirical and molecular formulas of methane gas (CH4) are
identical.
Answer:
Because in methane atoms of carbon and hydrogen are present in simplest ratio of 1:4 that can not be simplified further in whole number so its Emperical formula is same as molecular formula.
Explanation:
Define covalent bond.