Answer:
132g
Explanation:
The reaction equation is given as:
CaCO₃ → CaO + CO₂
Given;
Number of moles of CaCO₃ = 3 moles
Unknown:
Mass of CO₂ produced = ?
Solution:
From the balanced reaction equation;
1 mole of CaCO₃ will produce 1 mole of CO₂;
3 mole of CaCO₃ will then produce 3 moles of CO₂
To find the mass of CO₂;
Mass of CO₂ = number of moles x molar mass
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Mass of CO₂ = 3 x 44 = 132g
A block of wood has the mass of 180 grams.it is 10 cm long,6 cm wide and 4 cm thick.what is it’s density?
Answer:
0.75 g/cm³
Explanation:
Given data:
Mass of wooden block = 180 g
Length of block = 10 cm
Width of block = 6 cm
Height or thickness = 4 cm
Density of block = ?
Solution:
Volume of block = height × length × width
Volume of block = 4 cm × 10 cm× 6 cm
Volume of block = 240 cm³
Density of block:
density = mass/ volume
d = 180 g/ 240 cm³
d = 0.75 g/cm³
Which of the following is the correct formula for cesium sulfide
Answer:
Cs2S
Explanation:
The chemical formula of cesium sulfide is Cs₂S.
What is the chemical formula?A chemical formula gives information about the chemical proportions of atoms of each element in a chemical compound or molecule. The chemical formula of a compound can be written by utilizing the chemical symbols of elements, numbers (subscripts), and other symbols, such as plus (+) and minus (−) signs, commas, dashes, and brackets.
A chemical formula of a compound consists of not any words but can be represented in certain simple chemical structures. Chemical formulae can be more restricted in power than chemical names and chemical structural formulae. In chemistry, we have two kinds of chemical formulas: one empirical formula and another molecular formula.
The chemical formula of cesium sulfide is Cs₂S which is an inorganic salt. It can be produced by the reaction of cesium and sulfur in solvent THF and also can be produced from cesium hydroxide and hydrogen sulfide.
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what is Very small and located on ER or located
floating on its own in the cytoplasm, it is
responsible for making proteins for repair and
growth.
Through which of the following loose soil materials does water infiltrate fastest?
A. pebbles
B. sand
C. silt
D. clay
Explanation:
I think pebbles because the pebbles can be different sizes and have bigger gaps in between them so the water will go through quicker.
hope this helps srry if wrong
You are required to make 250 cm3 of a solution of
sodium hydroxide which has a concentration of
0.1 mol dm-3. What mass of sodium hydroxide would
you need to weigh out?
A 0.1 g
B 1.0 g
C 4.0 g
D 25.0 g
Answer:
b) 1.0g
Explanation:
C=m
MV
where Cis concentration
m is mass of substance
M is molar mass
V is volume of substance
To find m
CMV=m
but M = 23+16+1
= 40
0.1×40×0.25=m
1.0=m
Can somebody please help with this question?
Most of the energy absorbed by a plant is _____.
Answer:
sunlight
Explanation: i go to school
Answer:
light/sunlight
Explanation:
Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide (absorbed from the air) and water into glucose, a type of sugar.
Hope this helped!
Antioxidants are
oxidizing agents found in foods.
reducing agents found in foods.
fat-soluble.
water soluble.
Name:
R = 0.0821 Latm
PV = nRT
P1 V1\ n1 T1 =P2 V2/ n2 T2
1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature
of 28.5 °C?
2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has
cooled?
Answer:
1. V = 1.47L
Explanation:
1) Using PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = gas constant (0.0821 Latmk mol)
n = number of moles
T = temperature (K)
To get number of moles, we say mole = mass/molar mass
Molar Mass of C2H2 = 12(2) + 1(2)
= 24 + 2 = 26g/mol
mole = 3.86/26
mole = 0.148mol
T (K) = 28.5°C + 273.15
T(K) = 301.65K
PV = nRT
2.5 × V = 0.148 × 0.0821 × 301.65
2.5V = 3.665
V = 3.665/2.5
V = 1.466
V = 1.47L
R =
PV = nRT
P1 V1\ n1 T1 =P2 V2/ n2 T2
1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature
of 28.5 °C?
2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has
cooled?
Jodie is studying the sleeping habits of various types of animals. She wants to know how long each type of animal sleeps during the day.
Jodie puts each of the animals in a cage with food, water, and light. However, she cannot stay to watch the animals all day.
Which of the following tools would be most helpful to Jodie's experiment?
A.
a tape recorder
B.
a video camera
C.
a metric ruler
D.
a triple beam balance
Earth's land areas, oceans and atmosphere maintain fairly constant average temperatures. What is the best explanation for these constant average temperatures? (8.10 A) Earth's Northern and Southern hemispheres have opposite seasons. Earth's Northern and Southern hemispheres have opposite seasons. Earth is tilted and rotates daily on its axis. Earth is tilted and rotates daily on its axis. The continuous motion of air and water distributes the sun's energy. The continuous motion of air and water distributes the sun's energy. Global weather systems generally move from west to east.
Answer:
The continuous motion of air and water distributes the sun's energy.
Explanation:
The continuous motion air and water helps to distribute the sun's energy throughout the earth, and thus maintain fairly constant average temperatures.
The equatorial regions of the earth receives more heat than regions of higher latitudes. By means of convection air currents, whereby hotter and lighter air from the equatorial regions is circulated for colder and denser air from the regions of higher latitudes, heat is distributed between these regions.
Also, the heat of surface waters at the equatorial regions is circulated in convection currents as seas and oceans move around, to other regions of the earth in order to maintain a fairly constant average temperature.
Answer:
the continuous motion of air and water distributes the suns energy.
Explanation:
Which of the following is referenced in the modern "periodic law"
A. Atomic mass
B. Electron configuration
C. Wavelengths of radiation
D. Atomic number
Which property of an atom or element will determine how it reacts with other elements or atoms?
O valence electrons
O protons
O neutrons
O electrons
Answer:
valence electrons
Explanation:
This is because the valence electrons determine if an atom of an element can bond with other elements.
6. Which specific processes in the rock cycle occur beneath the Earth's surface?
Support your answer.
Answer:
Under the earth's surface, rocks melt, metamorphize, and crystalize.
Explanation:
Metamorphic and Igneous rocks are basically dependant on the heat/pressure of the environment under the surface :) Melting, metamorphosing and crystallization all occur under earth's surface.
The specific processes in the rock cycle that occur beneath the Earth surface are :
Melting crystallizationmetamorphizationUnder the Earth surface the specific rock cycle processes that leads to the formation of the different types of rocks includes; Melting, metamorphization and rock crystallization.
Metamorphic rocks are formed from other rocks ( sedimentary and igneous rocks) due to the change in temperature and this process is metamorphization. while igneous rocks are formed from molten rocks caused by the melting process. Sedimentary rocks are formed by the deposition of sediments from weathering of existing rocks this is the crystallization process.
Hence the specific process in the rock cycle that occur beneath the Earth's surface are : Melting, metamorphosing and crystallization.
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The acceleration due to gravity on Earth’s moon is about 1.6m/s2. An astronaut with full survival pack has a mass of 100kg. He lifts a large boulder (rock) having a mass of 50kg. Losing his balance, and letting go of the boulder, the explorer trips and falls off a ledge that is 2m above the moon’s surface. Assuming that both the astronaut and the rock are the same distance from the surface of the moon, which object will hit the ground first:the astronaut or the rock? Explain your answer.
Answer:
Astronaut
Explanation:
Astronaut.He is 100kgs
which statement is correct for all elements in the same group
They have the same number of electrons in the highest occupied energy level
They have the same chemical reactivity
They have the same number of occupied energy levels
They have the same number of neutrons
on platooooo
What does the law of conservation of energy state?
A.
Energy can be created from nothing.
B.
Energy cannot be destroyed.
C.
Energy cannot change forms.
D.
The total amount of energy in a system changes continuously.
Answer:
Your answer is B. Energy cannot be destroyed
Explanation:
The total amount of energy remains constant in an isolated system. It states that energy can neither be created nor destroyed, but it can change from one form to another.
A man was 200 meter away from work if it took him 133 seconds to get to work
What was his speed?
HELP MEHHHHH
When the volume of the gas is 8L what is the pressure being exerted upon it?
Answer:
54
Explanation:
What is the mass of 2.1 moles of Ca(OH)2?
Please hurry I'm in a test!!!
Consider the following intermediate chemical equations.
2 equations. First: 2 upper N a (s) plus upper C l subscript 2 (g) right arrow 2 upper N a upper C l (s). Second: 2 upper N a subscript 2 upper O (s) right arrow 4 upper N a (s) plus upper O subscript 2 (g).
In the final chemical equation, NaCl and O subscript 2 are the products that are formed through the reaction between Na subscript 2 O and Cl subscript 2. Before you can add these intermediate chemical equations, you need to alter them by
A.) multiplying the second equation by 2.
B.) multiplying the first equation by 2.
C.) multiplying the first equation by (1/2).
D.) multiplying the second equation by (1/4).
Answer:
OMG Why has nobody answered this FREE 40 POINTS!!!!
For your ConVenIence Sir!
I shall provide thine with the answer, copied from other great sir.
B.) multiplying the first equation by 2.
Explanation:
Here is an image for Thine HappyNess!!!!!!!!!!!!! :D :D :D :D
Before adding the intermediate chemical equations to get the final products first we have to multiplying the first equation by 2.
What is the stoichiometry?Stoiciometry of any chemical reaction gives idea about the amount of species present before and after the completion of the reaction.
Given first intermediate chemical equation is:
2Na(s) + Cl₂ → 2NaCl(s)
Second intermediate chemical equation is:
2Na₂O(s) → 4Na(s) + O₂(g)
Final products of the given chemical reactions are NaCl and O₂ which are formed by the below given balanced chemical reaction:
2Na₂O + Cl₂ → 4NaCl + O₂
To get the desire balance chemical equation before adding the given intermediate equation, first we have to multiply the first equation by 2.
Hence option (B) is correct.
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How do ethical concerns affect scientific research? a. scientists should set aside ethical concerns when doing research. b, scitentists should not let their own ethics interfere with their research. c. scientists must not hurt people or animals d.scientists should not let other peoples' ethics limit their research.
Answer:
C
Explanation:
I think that this answer Is more personal but they should try to limite animal cruelty in their research.
Answer:
C
Explanation:
You performed an experiment to find out how far three different sizes of
arrows would fly from a bow. Which of the following is a new scientific
question that can be investigated in the laboratory?
A. How much money should you spend on arrows?
B. How much farther does the arrow fly when you use a stronger
bow?
C. What type of arrow looks the coolest as it flies?
D. Are people more interested in seeing larger or smaller arrows in
movies?
Answer:
B how much farther does the arrow fly when you use a stronger bow
Explanation:
Option b. How much farther does the arrow fly when you use a stronger bow? represent the new scientific question that can be investigated in the laboratory.
What is the scientific question?It is a question that may result in a hypothesis for helping out in. It should be answering or figuring out the reason for some kind of observation.
So based on this, we can say that Option b. How much farther does the arrow fly when you use a stronger bow? represent the new scientific question that can be investigated in the laboratory.
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What’s the difference in the number of protons of an atom of lithium and an atom of chlorine :)) I need this answer quick
Answer:
14
Explanation:
The lithium atom has 3, which is its atomic number. (Atomic number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.) The chlorine atom has 17, so if you find the difference, it would be 14.
Shameeka is studying for an exam. She took the notes below about calcium and chlorine, which are known to form ionic bonds. Calcium, which is a metal, donates 2 electrons to chlorine. The individual calcium atoms become ions with a negative 2 charge. The bond between calcium and chlorine makes the atoms stable. Calcium and chlorine attract each other. Which best describes Shameeka’s error? ive got 2 hours so you dont need to rush
Answer:
Calcium has a charge of positive 2 not negative
Explanation:
in what aspects is a metalliod similar to metals and similar to non metals
Answer:
Explanation:Metalloids may act either like metals or nonmetals in chemical reactions. Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals.
plzzzzzz help me ?????
8. Well-aerated soils have the _______________ smell of good soil.
Answer:
Pore spaces filled with water
Which of the following minerals scratches
fluorite mineral?
a. talc
b. diamond
c. gypsum
d. calcite
Answer:
b. diamond
Explanation:
Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.
Fluorite is below diamond in the scale of hardness and it will readily scratch it. Talc, is the softest mineral, it will not scratch fluoriteBoth gypsum and calcite also below fluorite. They will not scratch this mineral.True or False: The solute is ALWAYS a solid and the solvent is ALWAYS a liquid
Answer:
false
Explanation:
Note that the solvent is the substance that is present in the greatest amount. Many different kinds of solutions exist. For example, a solute can be a gas, a liquid or a solid. ... Note that in each case, the solute particles are uniformly distributed among the solvent particles.
Two reasons that show sugar is a compound
Answer:
Sugar, any of numerous sweet, colourless, water-soluble compounds present in the sap of seed plants and the milk of mammals and making up the simplest group of carbohydrates. (See also carbohydrate.) The most common sugar is sucrose, a crystalline tabletop and industrial sweetener used in foods and beverages.
Explanation: