Answer:
Magnesium ion.
Explanation:
Before charge= 2.8.2
after charge= (2.8)2+
Which describes a feature of synthetic polymers? They can be naturally decomposed. They can be cheaply recycled. They can only be made in small quantities. They can be produced at a low cost.
Answer:
The correct option is;
They can be produced at low cost
Explanation:
In comparison to several other manufacturing materials, some synthetic polymers such as plastics are more durable cost effective, flexible, faster to produce and reliable
With regards to the cost comparison, the resins used for plastic are cheaper to obtain than mining for materials such as metals. In all quantities, it is cheaper to produce and manufacture plastics than to produce metals.
Due to the light weight and corrosion resistance of plastics, it is cheaper to store and transport plastics to several locations with different environment without the plastic requiring much effort for transportation or being affected by corrosion.
Answer:
d
Explanation:
Why BF3 acts as a Lewis acid???
Answer:
Explanation:
because it has electron deficiency
Which do all cells need in order to function?
oxygen
water
carbon dioxide
offspring
Answer:
oxygen is needed for all cells to function
1. Convert 1m3 to cm3.
Answer:
1000000 cubic centimetre
Answer:
1m^3 = 1000000cm^3
Explanation:
What is produced/made when our food is burned? ____________ + ____________ + __________ *
Answer:
do you have any vocabulary to help you with this or no
what do you mean by atom?
Answer:
a very small particale of matter
Explanation: something small in matter called an Atom.
A sample of a substance has a mass of 4.2 grams and a volume of 6 milliliters. The density of this substance is___ grams/milliliter.
Answer:
Answer:- Density of the substance is 0.7
i believe
How many pennies are in $2,020.20?
Answer:
202,020 pennies
Explanation:
The amount of pennies in 1 dollar is 100.
Basically, you just multiply the whole dollar amount (2020) by 100 and then add 20 to find the amount of pennies.
(2020)(100)+20= 202,000+20= 202,020 pennies.
Answer:
202,040 pennies
Explanation:
$1 is equal to 100 so just multiply 100 by 2,020 and then you can add the extra 20 cents
Type of reaction for H2SO4
why is air referred to as a mixture of gases
Answer:
Explanation:
air is considered as a mixture of gases because it contains many gases. They are :
78 % Nitrogen
21 % oxygen
And 1 % other gases
This image might help you
Hope this helps
plz mark as brainliest!!!!!!!!!!!
Which of the following choices are types of energy? (Select all that apply) A.kinetic energy B.physical energy C.thermal energy D.chemical energy
Answer:
kinetic, thermal and chemical not physical
The following are types of energy:
Thermal EnergyChemical EnergyKinetic EnergyMeaning of energyEnergy in physics is the ability to do work. Generally it can be said to be the strength, power or ability to do work.
Energy can be contained in a system, can be transformed and can be transfered.
different types of energy are needed in our day to day living.
In conclusion, the types of energy we have are the Thermal Energy, Chemical Energy, and Kinetic Energy etc.
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Give me a sentence of hypothesis
Answer:a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Explanation: Do you mean definition, because if you do here is the definition of a hypothesis, also it would help if you went into further detail of what the hypothesis is for.
if a gas sample in a balloon occupies 1.5 L at atmospheric pressure, what would be the pressure (in mmHg) if the volume was reduced to 0.8 L?
Answer:
1425 mmHg.
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 1.5 L
Initial pressure (P1) = 1 atm
Final volume (V2) = 0.8 L
Final pressure (P2) =?
Next, we shall determine the final pressure of the gas by using the Boyle's law equation as follow:
P1V1 = P2V2
1 × 1.5 = P2 × 0.8
1.5 = P2 × 0.8
Divide both side by 0.8
P2 = 1.5/0.8
P2 = 1.875 atm
Finally, we shall convert 1.875 atm to mmHg.
This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
1.875 atm = 1.875 × 760 = 1425 mmHg.
Therefore, the new pressure of the gas is 1425 mmHg.
Whats 243 daL converted to L
Number of liters (L) = 2430 L, 243 decaliters (daL) is equal to 2430 liters (L).
To convert 243 decaliters (daL) to liters (L), you need to use the conversion factor: 1 decaliter (daL) is equal to 10 liters (L).
So, to convert from daL to L, you can use the following equation:
Number of liters (L) = Number of decaliters (daL) × Conversion factor
Number of liters (L) = 243 daL × 10 L/daL
Number of liters (L) = 2430 L
Therefore, 243 decaliters (daL) is equal to 2430 liters (L).
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Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?
HYPOTHESIS.
In layman terms, a hypothesis is a rough assumption made according to scant observations. Then test to prove the assumption.
Explanation:
A process in which an acid reacts completely with an appropriate amount
of alkali to produce salt and water only is called
reaction *
Disproportionation
Hydrogenation
Dissociation
Neutralisation
Answer:
Neutralisation
Explanation:
HCl + NaOH = NaCl + H2O
What effect do abiotic cycles have on ecosystems?
Abiotic cycles have a great impact on ecosystems. when the cycles occur more often, like the water cycle in the rainforest, the living organisms of the ecosystem respond appropriately since the organisms in the rainforest are adapted to the conditions of the abiotic cycles
Explanation:
If the density of mercury is 13.6g/ml, what is the mass in grams of 3426 ml of the liquid?
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, calculate the mass in grans of the cylinder. (Assume pi=3.14
Answer:
Explanation:
Mass=density×volume
Mass=13.6g/ml×3426ml
Mass=46,593.6 g
An unknown sample of mystery element T is analyzed. According to the data 7.42% of the element is ^6T and 92.58% is ^7T. The true mass of ^6T is 6.02amu and 7.02amu for ^7T. Calculate the average atomic mass and identify the element.
Answer:
[tex]\boxed{\text{6.95 u; Li}}[/tex]
Explanation:
1. Atomic mass of T
To get the atomic mass of T, you calculate the weighted average of the atomic masses of the isotopes.
That is, you multiply the atomic mass of each isotope by a number representing its relative importance (e.g.., its percent of the total).
[tex]\begin{array}{ccrcr}\textbf{Atom} & \textbf{Mass/u} &\textbf{Percent} & \textbf{Calculation}& \textbf{Result/u}\\^{6}\text{T}& 6.02 & 7.42 & 6.02 \times 0.0742 & 0.45\\^{7}\text{T}& 7.02 & 92.58 & 7.02 \times 0.9258& 6.50\\& & &\text{TOTAL } = &\textbf{6.95}\\\end{array}[/tex]
2. Identity of T
Lithium has an atomic mass of 6.64 u.
Element T is lithium.
Write in standard notation: 3.2x 103
Answer:
3.2
10×10×10
=1000
so 3.2×1000
=3200
Why are forest fires so difficult to extinguish? Make reference to the energetics of combustion reactions.
Answer:Because of the wood
Explanation:Because forests are full of burnable things
I am doing an exam test and I need help! I don't get this question at all! "What determines the chemical and physical properties of a mineral?" If you can answer less than 10 minutes that would be great! Thank you!
Answer:
A mineral is an inorganic solid substance formed naturally in the ground having a definite physical and chemical properties.
The internal atomic structure or arrangmenet of atoms of a mineral determines the chemical and physical properties of the mineral.
For example: diamonds and graphite, atmoic structure of diamond is rigid tetrahedral network providing chemical and physical properties of diamond.
which of the following resources can replenish themselves by quick recycling and replacement , within a reasonable time , if managed properly?
plz say the answer with explanation
options
A. coal
B. soil
C. natural gas
D. sunlight
Answer:
B
Explanation:
Among all the answers soil is the only renewable resource.
Both coal and natural gas are a non-renewable resource
Even though sunlight can be used for solar panels as a renewable resource but when the sun dies out from burning there is no replacement for it.
Hence, only answer is soil
the members of group IA are called alkali metals. give reason 2 marks
Explanation:
Hey, there!!
Group IA elements are called alkali metals because they are highly soluble in water and produce hydrogen and soluble bases.
For, Eg:
[tex]2na + 2h2o = 2naoh + h2[/tex]
[tex]2k + 2h2o = 2koh + h2[/tex]
Hope it helps...
How are states of matter different at an atomic scale?
Answer:
The bonds that exist between their atoms and molecules differ on an atomic scale.
Explanation:
The three basic states of matter are solid, liquid, and gas. The major difference between them is the strength of the bonds that hold their molecules together. This affects the way that the molecules interact with each other.
The intermolecular forces binding solids together are very strong. This makes solids rigid and not able to move about freely, but rather, only able to vibrate about a mean position.
The intermolecular forces binding liquid atoms together are a lot weaker than that of solids. This makes liquids able to flow.
The intermolecular forces binding gas molecules together are the weakest. As a result, the gases can move about freely and occupy no definite volume.
Which of the following is an example of an observation?
An observation is a major step in scientific experimentation that has to do with recording what is seen, heard, or felt.
What is observation?Observation is the process of acquiring information about phenomena using the sense organs.
Thus, one can observe by hearing, feeling, seeing, and record the outcomes accordingly.
Observation is a major part of the scientific method. Analysis of the information gathered from observation will enable scientists to come into proper conclusions.
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Michael tells Sara he weighs 104 pounds. Sara says she is 44 kilograms. who is heavier?
Answer: Michael weighs more
Explanation: 44 kilos to pounds is around 97 pounds. hope this helps:)
how much calcium in gram is present in Ca(NO3)2 that contains 1.4 gram of Nitrogen
Answer:
28.57 grams are in (NO3)2
Explanation:
Matter is anything that has volume and takes up space. True False
Answer:
true
Explanation:
true matter does have volume and takes up space
On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively show that this data is in accordance to law of multiple proportions
Answer:
On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively show that this data is in accordance to law of multiple proportions
On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively show that this data is in accordance to law of multiple proportions
Explanation:
On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively show that this data is in accordance to law of multiple proportions
On analysis it was found that black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively show that this data is in accordance to law of multiple proportions