Answers
Answer:
Explanation:
chemical change is a change where mew substance is formed
Related Questions
If you have 40.0 g HCl and 40.0 g NaHCO3, do you have the same number of moles of each?
Answers
They both have a different number of moles
Further explanationGiven
40 g HCl
40 g NaHCO3
Required
moles
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
n = mass : molar mass
So the moles of a compound are affected by its molar mass (inversely proportional)
The larger the molar mass (of the same mass), the smaller the moles
molar mass HCl = 58.5 g/mol
molar mass NaHCO3 = 84 g/mol
mol HCl :
= 40 : 58.5
= 0.684
mol NaHCO# :
= 40 : 84
= 0.476
Which use of biotechnology most benefits North Carolina agriculture? *
O Producing human vaccines
Producing disease resistant crops
O Producing new medicines from bacteria
O Producing enzymes to eliminate pollutants
Residents of North Carolina presently bum 5 billion gallons of imported
Answers
Answer:
Producing disease-resistant crops
Explanation:
B. is the Right Answer Hope this helps!
Among all the given options, the correct option is option B. Producing new medicines from bacteria is the most benefits for North Carolina agriculture.
What is biotechnology ?The human genome's sequencing has sparked a biotechnology revolution that will have an impact on every area of our lives, including our environment, diet, and methods of sickness detection and treatment.
Already, biotechnology has raised the standard of living for us. The scope as well as volume of biotechnology's effects will increase in the coming decade as the rate of technological advancements increases.
The use of molecular biology innovations for applications in animal and human health, agriculture, the environment, and speciality biochemical manufacture is the widest definition of biotechnology. Producing new medicines from bacteria is the most benefits for North Carolina agriculture.
Therefore, the correct option is option B.
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Which graph above shows an object’s acceleration?
a or b
Why did you choose that graph in question above (explain why)
Answers
Answer:
A i just did it. And yes i do go to k12
Explanation:
Which type of absolute dating method would be best for a rock layer believed to be millions of years old?
Answers
Explanation: Most absolute dates for rocks are obtained with radiometric methods. These use radioactive minerals in rocks as geological clocks. The atoms of some chemical elements have different forms, called isotopes.
A room is a cube that measures 4 meters in each dimension. If the temperature changes from 10 C to 30 C, and the pressure decreases from 760 mm to 718 mm Hg, would air be trying to enter or leave the room? Show tour work
Answers
Answer:
More air will enter the room since the volume of the room increases.
Explanation:
We'll begin by calculating the initial volume (V₁) of the room. This can be obtained as follow
Length (L) of room = 4 m
Initial volume (V₁) =..?
V₁ = L³
V₁ = 4³
V₁ = 64 m³
Next, we shall determine if there is an increase in the volume of the room or not. This can be obtained as follow:
Data obtained from the question include:
Initial volume (V₁) = 64 m³
Initial temperature (T₁) = 10 °C + 273 = 283 K
Final temperature (T₂) = 30 °C + 373 = 303 K
Initial pressure (P₁) = 760 mmHg
Final pressure (P₂) = 718 mmHg
Final volume (V₂) =?
P₁V₁/T₁ = P₂V₂/T₂
760 × 64 / 283 = 718 × V₂ / 303
48640 / 283 = 718 × V₂ / 303
Cross multiply
283 × 718 × V₂ = 48640 × 303
203194 × V₂ = 14737920
Divide both side by 203194
V₂ = 14737920 / 203194
V₂ = 72.53 m³
SUMMARY
Initial volume (V₁) of room = 64 m³
Final volume (V₂) of room = 72.53 m³
From the calculations made above, we can see that the volume of the room increases from 64 m³ to 72.53 m³. Thus more air will enter the room since the volume of the room increases.
In the following chemical equation, which are the reactants?
2HF + Mgo MgF2 + 2H20
>
A. 2HF + MgF2
B. 2H+ + Mgo
C. MgF2 + H20
D. MgO + H20
A
B
D
Answers
2HF + Mgo MgF2 + 2H20
>
A. 2HF + MgF2
B. 2H+ + Mgo
C. MgF2 + H20
D. MgO + H20
A
B
D
In the following chemical equation, which are the reactants?
2HF + Mgo MgF2 + 2H20
>
A. 2HF + MgF2
B. 2H+ + Mgo
C. MgF2 + H20
D. MgO + H20
A
B
D
PLZ help, I'm really behind in school! I will mark brainliest for correct answers!
If the distance between two objects is reduced by a factor of 5, how will Fg be affected?
A. F g decreases to 1/25
B. F g increases by 5 times
C. F g decreases to 1/5
D. F g increases by 25 times
Answers
Answer:
Gravitational force is given by:
F=G×
d
2
m×M
Distance between two masses is increased s.t. new distance is D= 5 d
New gravitational force F
1
=F
Let on of the mass is changed to m
1
so as to maintain the same gravitational force.
Answer:
D
Explanation:
F g increases by 25 times
heres my other dog her name is penny! shes a shih'tzu :]
Answers
Answer:
omg so cute!!!!
Explanation:
what would a bond between potassium and chlorine be
Answers
Answer:Potassium react with elemental chlorine, an electron transfers from a potassium atom to a chlorine atom, forming potassium ion and chloride ion. ... As the bond formation between ions, the bond will be ionic. This is because, this process of transfer of electrons from one atom (K) to another atom (Cl).
Explanation:
What two terms are used to describe the temperature at which solids and liquids of the same substance exist at the same time?
Answers
Answer:
The answer is melting and freezing point.
Explanation:
How many molecules are there in 5.9 moles of NaCl?
Answers
The number of molecules= 3.55 x 10²⁴
Further explanationGiven
5.9 moles of NaCl
Required
The number of molecules
Solution
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 5.9 moles :
= 5.9 x 6.02 x 10²³
= 3.55 x 10²⁴
LEVEL 2
Solve each problem and write
the matching letter on the
blank above the answer
S Iron (1) oxide
Lead (IV) oxide
I
Load (1) Oxide
U Iron (1) Oxide
H Iron (III) hydroxide
T
Iron (IV) oxide
R Iron (II) Oxide
G Lead (1) Oxide
O
Lead (II) hydroxide
N
Iron (1) hydroxide
A Lead (111) hydroxide
Pbo
Feo,
Fe(OH), Pb(OH), FOOH
Pb,
Fo,o
Pb(OH),
Foo
Pb(OH), Foo
FeOH
Pbо,
Answers
Answer:
PbO = lead oxide G
FeO2 Iron (iv) oxide T
Fe(OH)3 iron(iii) hydroxide H
Pb(OH)3 lead(iii) hydroxide A
FeOH iron(i) hydroxide N
Fe2O3 iron (iii) oxide S
Pb(OH)3 lead(iii) hydroxide A
FeO iron(ii) oxide R
Pb(OH)2 lead(ii) hydroxide O
Fe2O iron (i) oxide U
FeOH iron (i) hydroxide N
PbO2 lead(iv) oxide D
Explanation:
Which best explains why fungi are often called natural recyclers?
They provide a continuous food resource for many other organisms.
They break down rotting materials and return nutrients to the soil.
They take in large amounts of carbon dioxide, helping to clean the air.
O They are found in nature and have many different practical uses,
Answers
They break down rotting materials and return nutrients to the soil.
( They don't do photosynthesis since they are much different from plants)
Answer:
B
Explanation:
What does autosexual mean?
Answers
Answer:
Autosexuality means people are more attracted to themselves than to others and may prefer masturbation to sex with a partner.
Answer: autosexual people are people who are attracted to themselves rather than other people.
Explanation:
1.) The following is a close view of particle movements. Which state of
matter are you viewing?"
Answers
Answer: Gas
Explanation:
Gas. The arrows represent direction. They are moving around in the box extremely fast, and are not compact like a solid or liquid.
Cytokinins _____.
are naturally produced by plants
are used by Christmas tree growers
are primarily found in roots and fruits
all of the above
Answers
Which statement describes absolute and apparent brightness?
Answers
NOTES TO TAKE DOWN:
Apparent brightness is a human measurement, and it would change for each star if the measurement were taken from another location. The more precise counterpart of apparent brightness is called absolute brightness (or absolute magnitude) and is the measure of the luminosity of a star, but on a common scale.
ANSWER:
Absolute brightness is the actual amount of light produced by the star, whereas apparent brightness changes with distance from the observer.
What is salinity? (giving you 30 points if you answer it and I give brainlist)
Question 1 options:
a liquid mixture in which the smaller component (solute) is distributed evenly through the major component (solvent)
The concentration of dissolved salt in a liquid
to become incorporated with a liquid in forming a solution
the total amount of salt dissolved in the sea
Answers
Answer:
D
Explanation:
Salinity is the saltiness or amount of salt dissolved in a body of water
Answer:
its b trust me i got it right
Explanation:
How many moles of silver metal are produced from 1.55 moles of copper metal? How many moles of copper(II) nitrate?
Answers
Answer:
1. 3.1 moles of silver, Ag.
2. 1.55 moles of Cu(NO₃)₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Cu + 2AgNO₃ —> Cu(NO₃)₂ + 2Ag
From the balanced equation above,
1 mole of Cu reacted to produce 1 mole of Cu(NO₃)₂ and 2 moles of Ag.
1. Determination of the number of mole of silver (Ag) produced.
From the balanced equation above,
1 mole of Cu reacted to produce 2 moles of Ag.
Therefore, 1.55 moles of Cu will react to produce = 1.55 × 2 = 3.1 moles of Ag.
Thus, 3.1 moles of Ag is produced.
2. Determination of the number of mole of copper(II) nitrate, Cu(NO₃)₂ produced.
From the balanced equation above,
1 mole of Cu reacted to produce 1 mole of Cu(NO₃)₂.
Therefore, 1.55 moles of Cu will also react to 1.55 moles of Cu(NO₃)₂.
Thus, 1.55 moles of Cu(NO₃)₂ is produced
Which two protists are plant-like? Group of answer choices Euglena & Paramecium Paramecium & Amoeba Amoeba & Volvox Euglena & Volvox
Answers
Answer:
Euglena & Volvox
Explanation:
Protists are single cell organisms that belong to the kingdom protista. They are eukaryotic organisms.
Some protists are plant like and some protists are animal like. Euglena & Volvox are plant like protists.
They are called plant like protists because the cell contains chlorophyll and can make its own food when it has enough sunlight.
which of these elements has the highest electronegativity
A) lithium
B) nitrogen
C) potassium
D) arsenic
E) beryllium
Answers
how much salt will be obtained, neutralizing 11.2 grams. potassium hydroxide and hydrochloric acid? In the meantime, there is no need to worry about it. ”
Answers
Answer:
9.0217g
Explanation:
the chemical formula must be after balancingknown as 92.55 (mass) of KOH+HCL will produce 74.55 (mass) of salt, KCLhence, 11.2g of KOH and HCL will produce (x)g of saltWhat is the lowest energy level that contains d orbitals?
O A. 4
O B. 3
O C. 2
D. 1
Answers
Answer:
I believe it 3
anybody know the answer to this ???
Answers
Answer:
Answer is C.
Explanation:
I hope it's helpful!
Which statements accurately describe volume? Check all that apply. Volume is a physical property of an object. Volume is measured using a balance. The volume of a solid changes with the shape of the container. One unit of volume is the milliliter. Liquids and solids have constant volumes
Answers
Answer:
Liquids and solids have constant volumes
Explanation:
I believe this is the most correct statement
Answer:
Volume is a physical property of an object.
One unit of volume is the milliliter.
Liquids and solids have constant volumes.
Hope this helps <3
Explanation:
how much energy was added to the ice between point a and point d?
Answers
Answer: 26kj
Explanation:
Just took the test and got it right :D
Identify a human activity that impacts the land negativaly. Then describe a positive action that can help reduce the effects caused by the activity
Answers
Answer:
Pollution
•The number of trips one takes in a car should be reduced.
•Reduce or eliminate fireplace and wood stove use.
•Burning leaves, trash, and other materials should be avoided.
•Using gas-powered lawn and garden equipment should also be avoided.
In an ecosystem, pollution is a human activity that impacts the land negatively.Minimum use of vehicles and emission of smoke can help reduce the effects caused by the activity.
What is an ecosystem?An ecosystem is defined as a system which comprises of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through means of nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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There are 122.6L of argon gas in a tank. How many moles is this?
A)
2.76mols
B)
3.25mols
09
1.56mols
D)
5.5mols
Answers
There are 5.5 moles of Argon gas in tank
Further explanationGiven
122.6 liters of Argon gas
Required
The number of moles
Solution
Assume at STP
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.
So for 122.6 L :
= 122.6 L : 22.4 L
= 5.47 moles ≈ 5.5 moles
What are 3 similarities between physical changes and chemical changes
Answers
Answer:
Heat change is involved in both process.
II. Both result in change of state of matter
Explanation:
Physical change substance involves the alteration of physical state of a substance. Chemical change substance involves the alteration of the chemical composition of the substance
What does the respiratory system do for
the human body?
Answers
Answer:It’s helps use take in fresh air and conduct it to carbon
dioxide.
Explanation:Our respiratory system not only helps us turn air to Co2 the frest air also helps refresh our blood when it passes through our heart.
The primary function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing. When we breathe, we inhale oxygen and exhale carbon dioxide. This exchange of gases is the respiratory system's means of getting oxygen to the blood. The respiratory system also helps to regulate the acid-base level in the blood. lastly, the respiratory system allows us to vocalize by the movement of exhaled air through the larynx.
brings oxygen into the body