Answers
Answer:
1750
Explanation:
Greenhouse gases are those gases that are believed to contribute to the rise in the temperature of the earth by trapping infrared rays close to the surface of the earth.
Prominent among the greenhouse gases are; N2O, methane and CO2.
From the chart, we can see that the lowest sum of concentration of greenhouse gases measured in ppm was obtained in 1750. Thus this period shows the lowest composition of greenhouse gases.
Related Questions
Which statements correctly match the part of the microscope with its function? (choose all of the correct answers)
A
Ocular (Eyepiece) Lens: The knob that allows you to change the focus.
B
Objective Lenses: The lenses closest to the specimen.
C
Base: The lens at the top that you look through.
D
Arm: The very bottom of the microscope, used for support.
E
Stage: The flat platform where the slide is placed.
F
Stage clips: Metal clips that hold the slide in place.
Answers
Answer:
27
Explanation:
Match the parts of the element box as is making a periodic table key
Answers
Answer:
10 is the atomic number
Ne is the chemical symbol
Neon is the element name
20 is the atomic mass
Type of reaction in NaOH + KNO3 → NaNO3 + KOH
Answers
Answer:
It is a combustion reaction
Explanation:
Which indicator would tell scientists the most about future climate change
Answers
Which statement describes aluminum?
A. Aluminum is a conductor because the outer electrons of its atoms can move freely.
B. Aluminum is an insulator because the outer electrons of its atoms can move freely.
C. Aluminum is a conductor because its atoms form polar covalent bonds.
D. Aluminum is an insulator because its atoms do not have any valence electrons.
Answers
Answer: A. Aluminum is a conductor because the outer electrons of its atoms can move freely.
Explanation: Quizzed
The statement which best describes Aluminium is Option A , Aluminum is a conductor because the outer electrons of its atoms can move freely.
What is a Metal ?A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions (cations).
Metals conduct electricity because they have “free electrons.”
Unlike most other forms of matter, metallic bonding is unique because the electrons are not bound to a particular atom.
This allows the delocalized electrons to flow in response to a potential difference.
Aluminium is a metal and so a conductor.
Therefore , the statement which best describes Aluminium is Option A , Aluminum is a conductor because the outer electrons of its atoms can move freely.
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Which of these molecules is polar?
A.
N2
B.
NaCl
C.
HF
D.
CH4
Answers
Answer:
C
Explanation:
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Which of the following is not an example of a chemical change?
A. rusting iron B. an apple ripening C. cutting paper D. a piece of wood burning
Answers
Answer:
cutting paper is not an example of chemical change.
Explanation:
cutting paper is physical change, its physical properties (size, shape ) change but chemical composition remain same.
The cutting paper is not a example of chemical change of a chemical reaction.
What is chemical reaction?The kind of reaction in which one kind of element get converted into another kind of elements or molecule is referred as chemical reaction.
What is chemical changes?
Chemical changes take place when a material combines with the other to generate a new substance, a process known as chemical synthesis, or when a molecule decomposes into more than one separate chemicals, a process known as chemical decomposition. These processes are known as chemical reactions, and they are generally irreversible unless they are followed by more chemical reactions.
Cutting paper is just a physical change not chemical change since the paper's characteristics did not change; only the shape, which would be a physical attribute, changed. The term "chemical change" refers to a change in a substance's chemical properties. Burning of paper, for example, or rusting of iron.
Therefore, cutting paper is not a example of chemical change.
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dose my hair look good
Answers
Answer:very blurry but yes
Explanation:
What is the overall equation for the covalent bond in H2O . Is it H2 + O2=H2O OR. H2 + O = H2O
Answers
Answer:
The answer is in the photo
Explanation:
I hope that is useful for you :)
A container is filled completely with 197g of ethyl alcohol (density 0.790g/cm3). What is the volume of the container?
Answers
Answer:
The volume of the container is 249.367 cm³
Explanation:
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density, according to the International System of Units, is usually expressed in kilogram per cubic meter (kg/m³) or gram per cubic centimeter (g/cm³).
In this case:
density= 0.790 g/cm³mass= 197 gvolume= ?Replacing:
[tex]0.790 \frac{g}{cm^{3} } =\frac{197 g}{volume}[/tex]
Solving:
[tex]volume=\frac{197 g}{0.790 \frac{g}{cm^{3} } }[/tex]
volume= 249.367 cm³
The volume of the container is 249.367 cm³
WILL GIVE BRAINLIEST!!!
What is the mass of NaCl required to make 160 grams of a 32% solution of NaCl in water?
Answers
Answer:
19.20 g. Explanation: ∵ mass % = [mass of solute/mass of solution] x 100
what is the name of the chemical used for bleach in sugar industries
Answers
Answer: I think Sulfur dioxide
Explanation: sulfur dioxide is highly known as a bleaching agent in chemical factories during chemical processes and production
I am not to sure about bleaching in the SUGAR FACTORIES but if u need more explanation about sulfur dioxide in bleaching feel free to COMMENT!!!
A farmer wants to build a pond for her cows. What step must she take in order to build the pond?
A. Dig into the zone of aeration.
B. Place a permeable material on the ground.
C. Keep the soil moist.
D. Place an impermeable material on the ground.
Answers
Answer:
Option A:
Dig into the zone of aeration
Explanation:
Within the lithosphere of the earth's surface, the zone of aeration is the zone directly above the water table, with a lot of pore spaces within the rocks. These pore spaces contain air and water, which can be used to water the cows.
Once the zone of aeration has been dug into, the farmer can tap into the underground reserve of water, which is stored within the pores of rocks. This water can now sip into the hole that was dug up by the farmer, forming a pond for the cows.
Which solution is more concentrated show work and EXPLAIN your reasoning
Solution A
2 L of water
135.75 g of MgO
or
Solution B
2 L of water
119.6 g of CaCl2
Answers
Answer:
Solution A
Explanation:
Solution A
1 mole of MgO = 24 + 16 = 40 g
? moles of MgO = 135.75g
[tex]\frac{135.75}{75}[/tex] = 1.81 moles
1.81 moles of MgO is in 2 liters of water
? moles of MgO is in 1 liter of water
[tex]\frac{1.584}{2}[/tex] = 0.905moles/liter or 0.905M
Solution B
1 mole of CaCl₂ = 40 + 35.5 = 75.5 g
? moles of CaCl₂ = 119.6g
[tex]\frac{119.6}{75.5}[/tex] = 1.584moles
1.584 moles of MgO is in 2 liters of water
? moles of MgO is in 1 liter of water
[tex]\frac{1.584}{2}[/tex]= 0.792moles/liter or 0.792M
If I have an unknown quantity of gas at a pressure of 0.72 atm, a volume of 22
liters, and a temperature of 30° C, how many moles of gas do I have?
Answers
Answer:
0.64 mol
Explanation:
Using ideal gas equation as follows;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question;
P = 0.72atm
V = 22 L
T = 30°C = 30 + 273 = 303K
n = ?
Using PV = nRT
n = PV/RT
n = (0.72 × 22) ÷ (0.0821 × 303)
n = 15.84 ÷ 24.88
n = 0.64 mol
Use
your table of values to solve the problem below:
What is the (delta)Srxn of the following unbalanced reaction?
N2(g) +
O2(g) →
NO2(g)
do not round
Answers
How many atoms of hydrogen are in 10.25 grams of
water?
Answers
Which of the following best describes where cellular respiration occurs?
O A. In muscle cells
B. In the lungs
C. In every body cell
D. In the intestines
Answers
Answer:
The answer is 'C. In every body cell'
Explanation:
I hope this was helpful, have a blessed day.
Which of the following is an acceptable method to directly measure volume using the metric system?
A.
Using a balance scale to measure pounds.
B.
Using a graduated cylinder to measure liters.
C.
Using a graduated cylinder to measure gallons.
D.
Using a balance scale to measure grams.
Answers
Answer:
c
Explanation:
when measuring liquids you use liters
The acceptable method to directly measure volume using the metric system using a graduated cylinder to measure gallons. Thus, option C is correct.
What is proportion?The angles and relative measurements of a polished gem and the relationships between them are called proportion. Proportion is defined as equation in which two ratios are set equal to each other.
The relationship among the different things or parts with respect to comparative size, degree and number. There are several types of proportion and these are direct proportion, compound proportion, continued proportion, and inverse proportion.
Gravitational force is a force which act on objects which have a matter i.e a object which contains mass. Gravitational force is force which act between two objects which have a mass and both object are try to attract each other.
Therefore, The acceptable method to directly measure volume using the metric system using a graduated cylinder to measure gallons. Thus, option C is correct.
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Isaiah rolls a tennis ball along the ground. Which of the following best explains what will happen if forces act on the ball?
Answers
Answer:
what are the following
Explanation:
what are the options?
Answer:
the ball will stop moving
¿Cuál de estas sustancias exhibe combustibilidad?
El acero.
El hierro.
El vidrio.
El papel.
Answers
Answer:
Acero
Explanation:
What is the freezing point of a solution that has 5.0 moles of Nal in 1250 g of water? (K = 1.86°C/m; molar
mass of water = 18.0 g)
Answers
How many grams of water are needed to produce 8.11 mol of tetraphorsphorus decaoxide? P4 O10 (s) + 6 H2 O (l) → 4 H3 PO
Answers
Answer:
https://brainly.com/question/23218880?answering=true&answeringSource=userQuestions%2FprofilePage%2F1
Explanation:
Answer:
bx id k
Explanation:
GUYS PLEASE HELP ME
giving brainliest
Answers
2
Hope this helps :)
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Which of the following could be the hypothesis supported by an investigation that demonstrates the law of conservation of mass in relation to chemical reactions?
A. If the reaction obeys the law of conservation of mass, then mass will be the same before and after the reaction.
B. If the reaction obeys the law of conservation of mass, then mass will increase after the reaction.
C. If the reaction obeys the law of conservation of mass, then mass will be different before and after the reaction.
D. If the reaction obeys the law of conservation of mass, then mass will decrease after the reaction.
Answers
According to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. If the reaction obeys the law of conservation of mass, the mass before and after the reaction will be the same.
What does the law of conservation of mass?Any element's mass at the start of a reaction will equal its mass at the end of the reaction. Accounting for all reactants and products in a chemical reaction results in the same total mass at any point in time in any closed system.
When coal, for example, is burned, the carbon atom transforms into carbon dioxide. The carbon atom undergoes transformation from solid to gas, but its mass remains constant.
According to the law of conservation of mass, the amount of mass that enters a chemical reaction in the form of reactants must equal the amount of mass that exits the reaction process in the form of products. This is only possible in a closed system. For example, if 2g of reactant A reacts with 32g of reactant B, the mass of the product AB formed is 34g.
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Which choices are uses of electrical energy?
Choose all that apply.
A. creates useful gases
B. supplies energy for heat
C. provides power to lights
D. creates a magnetic force
Answers
Answer:
option A,B and C.
are the options I chose.
The electrical devices include those that are needed to power appliances and those that are used in daily life. In order to make things operational, they need power or energy.
Electrical energy is taken from the movement of electronically charged particles. These when collide produce energy that can be used for heating, lighting, etc.Hence the option C is correct.
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____ occurs when the vapor pressure of a liquid is equal to the external atmospheric pressure.
Answers
Answer:
c
Explanation:
boiling
A greater force is required to move an object with a larger mass than one with a smaller
mass.
Answers
Answer:
Explanation:
what do u need to know
A beach ball has a volume of 2.5 L of gas while at a temperature of 500 K. If the volume decreases to 2 L, what is the new temperature?
Answers
Answer:
250k
I Really This Helps A Little Bit.
Which of the following equilibria would not be affected by a pressure change?
1) C2H4(g) + H2O(g) = C2H5OH(g)
2) 4HCl(g) + O2(g) = 2H2O(g) + 2Cl2(g)
3) PF3Cl2(g) = PF3(g) + Cl2(g)
4) CO(g) + H2O(g) = H2(g) + CO2(g)
Answers
Answer:
C2H4(g) +H2O(g)=C2H5OH(g)