Answer:
They have to be decreased to a lower kinetic energy by lowering the temperature
Explanation:
Solute affects the freezing point of a solvent because, When a substance starts to freeze, the molecules slow down due to the decreases in temperature, and the intermolecular forces start to take over. Therefore, they have to be decreased to a lower kinetic energy by lowering the temperature
Which is an example of a chemical change?
A.
freezing water
B.
boiling water
C.
baking a cake
D.
felling a tree
E.
breaking a glass pane
Answer:
D
Explanation:
Three gases found in Earth's atmosphere are carbon dioxide, nitrogen and oxygen. What is their order of abundance from greatest to least?
A. nitrogen, oxygen, carbon dioxide
B. nitrogen, carbon dioxide, oxygen
C. oxygen, nitrogen, carbon dioxide
D. carbon dioxide, oxygen, nitrogen
The order of abundance from greatest to least in gases found in Earth's
atmosphere is nitrogen, oxygen, carbon dioxide.
There are various gases present in the atmosphere such as nitrogen,
oxygen, carbon dioxide etc. Each of them have their important functions in
ensuring the ecosystem is balance and for survival of the organisms present.
The most abundant element is Nitrogen which accounts for about 78
percent of air. Oxygen is the second most abundant with 21 percent present
in air. Others such as carbon dioxide and inert gases represent the
remaining percentage present in air.
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Which word equation shows hydrogen reacting with oxygen to form water?
ОООО
oxygen + water → hydrogen
hydrogen + oxygen → water
oxygen + water → hydrogen + water
O hydrogen + water → oxygen
Answer:
hydrogen and oxygen>water
What is the oxidation number (charge) of Copper in CuMnO4 ?
ANSWER:
+2
Explanation:
Recognize CuSO 4 as an ionic compound containing a copper ion and a sulfate ion, SO42-. To form an electrically neutral compound, the copper must be present as a Cu2+ ion. The oxidation state is therefore +2.
which phrase best describes a scientist? a. a person who is highly educated b. a person who learns about the world by observing it. c.a person who understands how the world behaves. d. a person who is extremely knowledgeable about the world
Answer:
B
Explanation:
None of the other responses doesn't seem right. A is to broad someone can be a scientist and might not be highly educated. C not every scientist studies this field so no. Same goes for D
Answer:
B
Explanation:
Determine the frequency of light with a wavelength of 6.75 x 10 ^7 m
Answer:
4.44 Hz
Explanation:
v = frequency x wavelength = 3 x 10^8 m/s = frequency x 6.75x 10^7 m
frequency , f= [tex]\frac{3*10^8 }{6.75* 10^7}[/tex] =4.44 Hz
Microorganisms in the soil decompose waste as a source of energy for growth and release carbon dioxide (CO2). Scientists have observed that as soil temperatures increase (up to 25°C), the amount of CO2 released into the atmosphere from the soil increases. Which explanation about how environmental factors affect the growth of microorganisms is BEST supported by this observation? Group of answer choices An increase in soil temperature decreases microorganism growth because the rate of decomposition decreases. An increase in soil temperature increases microorganism growth because the rate of decomposition increases. An increase in the amount of CO2 in the atmosphere from the soil increases microorganism growth because the rate of decomposition decreases. An increase in the amount of CO2 in the atmosphere from the soil decreases microorganism growth because the rate of decomposition increases.
Answer:
An increase in soil temperature increases microorganism growth because the rate of decomposition increases.
Explanation:
An increase in soil temperature increases microbial activities and the activity of extracellular enzymes that degrade polymeric organic matter within the soil. An increase in the soil microbial activities means that the decomposition rate and microorganism growth would increase. Increase in the activity of extracellular enzymes that degrade polymeric organic matter within the soil also means that more carbon dioxide would be produced and released into the atmosphere.
Please I need help with this homework
An 18-g sample of element A combines completely with a 4-g sample of element B to form the compound AB. What is the mass of the compound formed?
Answer:
22g
Explanation:
Given parameters:
Mass of element A = 18g
Mass of element B = 4g
Unknown:
Mass of compound formed = ?
Solution:
The reaction equation is given as;
A + B → AB
According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".
Simply mas is conserved and the mass of the reactants is the same as the mass of the product that forms.
Mass of reactants = mass of A + mass of B = 18g + 4g = 22g
So;
Mass of product AB = 22g
GIIVNG BRAINLYY!!!! Universal indicator is an acid/base indicator that can be added to a solution to determine its pH. Universal indicator turns solutions different colors based on its pH. A student adds universal indicator to a solution, and the solution turns the color shown below. The solution must be what? view the attachment
Answer:
When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. Bases cause universal indicator to change from green toward purple.
Explanation:
The universal indicator turns the solution in red color then the solution must be strongly acidic. Therefore, option (B) is correct.
What is a universal indicator?A universal indicator can be described as a pH indicator made of a solution of various compounds that exhibits many smooth color changes over a wide range of pH values to indicate the acidity or basicity of the solution.
The chemical indicator is a substance that indicates the color change, or the presence/ absence of a threshold amount of a chemical species, such as an acid or base in a solution.
There are many kinds of indicators such as Universal indicator, methyl orange, litmus, phenolphthalein, and bromothymol blue. They are utilized to tell the acidity and basicity of the solution by color change.
In an acidic medium, the universal indicator will show colors such as red, orange, yellow, orangish-yellow, etc. In the basic medium, the universal indicator will change its color to blue-violet or purple. In a neutral medium, it will show green color.
Therefore, the given color is red so the solution is strongly acidic as it has a very low pH value.
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What oxidation half-reaction happens when iron reacts with tin(II) nitrate?
Fe(s) + Sn(NO3)2(aq) → Fe(NO3)2(aq) + Sn(s)
O A. Fe2+ (aq) + 2e → Fe(s)
O B. Sn(s) → Sn2+(aq) + 2e
O C. Fe(s) → Fe2+(aq) + 2e
O D. Sn2+(aq) + 2e → Sn(s)
Answer: Fe(s) —> Fe2+ (aq) + 2e-
Explanation:
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?
Answer:
A. 0.00420 J/(gi°C)
Explanation:
i got it rigt
. A sample of NH₃ gas occupies 57.0 liters at STP. How many molecules of NH₃ is this?
Answer:
15.30 ×10²³ molecules of ammonia
Explanation:
Given data:
Volume of ammonia = 57.0 L
Temperature = standard = 273 K
Pressure = standard = 1 atm
Number of molecules of ammonia = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1 atm ×57.0 L = n ×0.0821 atm.L/ mol.K × 273 K
57.0 L.atm = n × 22.41 atm.L/ mol
n = 57.0 L.atm/22.41 atm.L/ mol
n = 2.54 mol
Number of molecules of ammonia:
1 mole of gas have 6.022 ×10²³ molecules of ammonia.
2.54 mol ×6.022 ×10²³ molecules / 1 mol
15.30 ×10²³ molecules
calculate the mass of 120cc of nitrogen at stp .how many numbers of molecules are prrsent
Answer:
3.2 x 10²¹molecules
Explanation:
Given parameters:
Volume of nitrogen gas = 120cm³
Unknown:
Mass of nitrogen gas = ?
Number of molecules = ?
Solution:
To solve this problem, note that;
1 mole of gas occupies a volume of 22.4L at STP
Now;
convert 120cm³ to L ;
1000cm³ = 1L
120cm³ gives 0.12L
Since;
22.4L of gas has 1 mole at STP
0.12L of gas will have [tex]\frac{0.12}{22.4}[/tex] = 0.0054mole at STP
So;
Mass of N₂ = number of moles x molar mass
Molar mass of N₂ = 2(14) = 28g/mol
Mass of N₂ = 0.0054 x 28 = 0.15g
Now;
1 mole of a gas will have 6.02 x 10²³ molecules
0.0054 mole of N₂ will contain 0.0054 x 6.02 x 10²³ =
3.2 x 10²¹molecules
What is physical weathering?
the building up of rock that has been brought from other places
the breaking of rock into smaller pieces from chemical processes
the breaking of rock into smaller pieces from nonchemical processes
the moving of rock from one place to another
Physical weathering is caused by physical processes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves.
hope this helped
What is the electrical charge on the nucleus of a carbon-12 atom
Answer:
Neutral carbon-12 (or any carbon atom) has 6 electrons with a total negative charge of 6e- orbiting a nucleus with a total positive charge of 6e+, so that the total net charge is zero. The nucleus is made up of 6 protons, each with a positive charge of e+, and 6 neutrons, each with zero charge.
Explanation:
Answer:
Neutral Carbon-12 Atom
PLEASE HELP, MAJOR, MARKED AS BRAINEST
PbO2 (s) + 4 HCl (aq) → PbCl2 (s) + Cl2 (g) + 2 H2O (l)
This is an oxidation-reduction (redox) reaction:
PbIV + 2 e- → PbII
(reduction)
2 Cl-I - 2 e- → 2 Cl0
(oxidation)
PbO2 is an oxidizing agent, HCl is a reducing agent.
which of the following is not true of hydrogen?
it can form an ion with a +1charge
It can form an ion with a -1 charge.
It is usually found as free hydrogen and not combined with other elements.
It is a colorless, odorless gas.
Can someone please answer my last question, ill post more like it for more points :)
Determine the pressure exerted by 0.352 mol of oxygen gas in a 1.75 L container at room temperature (25 degrees Celsius). Show all your work!
Answer:
P = 4.92 atm
Explanation:
Given data:
Number of mole of oxygen = 0.352 mol
Volume of gas = 1.75 L
Temperature = 25°C
Pressure exerted by gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
P × 1.75 L = 0.352 mol × 0.0821 atm.L/ mol.K ×298 K
P = 8.61 atm.L / 1.75 L
P = 4.92 atm
What is Half-Life?
plz help me im fillin out a study guide
Answer:
a game made by valve
Explanation:
its a 10/10 game
Pls answer this quicklyyy!
Which material has a density most similar to the density of water?
a. Rubber
b. Titanium
c. Ice
d. Egg
e. Granite
f. Titanium
Answer:
c
Explanation:
Does light move faster through more dense or less dense material
a. gaining 3 electrons
b. losing 3 electrons
c. gaining 5 electrons
d. losing 5 electrons
Answer: C. Gaining 5 electrons
Explanation: Aluminium has 3 valence electrons to have a full outer shell it would need 5 to become an octet (8).
Which feature is created on the exterior of a volcano when it erupts?
Answer:
When the magma reaches it boiling point and it starts to rise
Explanation:
PLS ANSWER ITS FOR AN EXAM I DONT HAVE MUCH TIME THANK UUU
Changing a physical property of a sample of matter
A. will not alter its chemical composition if the change is small.
B. will alter its chemical composition if the change is large.
C. always alters its chemical composition.
D. never alters its chemical composition.
Answer:
d. never alters
Explanation:
physical is how it looks, not its chemical makeup... good luck bro :)
Need help fast!!!
_______are organisms that consume other organisms
A) autotrophs
B) heterotrophs
C) producers
D) plants
Answer:
B) heterotrophs
Explanation:
hetero meaning other or different from its own species
Answer:
Answer:
♡ hi fairy ♡
-- the answer is heterotrophs
~ madeline ✧･ﾟ: *✧･ *:･ﾟ✧*
Explanation:
Which of the following can occur after a rock is weathered?
It forms metamorphic rock.
It melts and forms igneous rock.
The sediment can form magma.
It gets compacted and forms sedimentary rock.
Answer:
It gets compacted and forms sedimentary rock.
Explanation:
After a rock is weathered, one thing that can happen is for it to get compacted and form sedimentary rock.
When a rock is weathered, sediments are produced from their erosion. These materials are collected and deposited by agents of denudation. In sedimentary basin, they get compacted, cemented and lithified. The lithified sediment will then form sedimentary rocks.URGENT!...
Hey guys i need help with this question please
Why are there more earthquakes in California than Tennessee?
A. There is more plate movement in Tennessee.
B. California is breaking off to fall into the ocean.
C. There is more plate movement in California.
Answer: C. There is more plate movement in California.
Explanation:
If 20.00 moles of KClO3 react, how many molecules of O2 will form?
Answer:
Explanation:
2KClO₃ = 2KCl + 3O₂
2 moles of potassium chlorate gives 3 moles of oxygen gas
20 moles of potassium chlorate will give 30 moles of oxygen gas .
30 moles of oxygen = 30 x 6.02 x 10²³ molecules of oxygen .
= 180.6 x 10²³ molecules of O₂ .