Answer:
The variables to be examined in relation to carbon dioxide use are the amount of light exposure and amount of dissolved CO2. Phenol red is yellow/orange under acidic conditions, that is when the pH of the solution is less than 7 (e.g. pH = 6). This occurs when the concentration of CO2 is high.
Explanation:
is this correct
A phenol red-containing solution with low CO2 level will appear red.
Phenol red is a substance that serves as an indicator. It changes in colouration in response to the acidity or alkalinity of solutions.
In acidic solutions, phenol red turns yellow while the colour is red in basic solution.
Solutions with high CO2 levels are acidic while those with little to no CO2 concentrations are basic.
Thus, in a low CO2 solution, phenol red will turn red and the solution will generally appear red.
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URGENT!!!!!
The reaction of aluminum with chlorine gas is shown.
2Al+3Cl2⟶2AlCl3
How many units of aluminum chloride (AlCl3) can be produced from 30 aluminum atoms?
number of AlCl3 units: _________________
The number of units of aluminum chloride (AlCl₃) that can be produced from 30 atoms of aluminum (Al) is 30 units
The balanced equation for the reaction is given below:
2Al + 3Cl₂ — > 2AlCl₃
From the balanced equation above,
2 atoms of Al reacted to produce 2 units of AlCl₃.
With the above information, we can determine the number of units of AlCl₃ that can be produced by the reaction of 30 atoms of Al. This can be obtained as follow:
From the balanced equation above,
2 atoms of Al reacted to produce 2 units of AlCl₃.
Therefore,
30 atoms of Al will also react to produce 30 units of AlCl₃.
Thus, 30 units of AlCl₃ were obtained from the reaction.
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cho các chất sau NaO2,Na,NaOH,Na2SO4,Na2SO3,NaCl,AgCl hãy lập thành dãy chuyển hoá , hoàn thành bằng phương tình phản ứng
Answer:
brainless me plss i help you out
What is the order of decreasing ionization energy?
1. cesium, barium, lead
2. barium, lead, cesium
3. lead, barium, cesium
4. barium, cesium, lead
5. lead, cesium, barium
6. cesium, lead, barium
who can write an essay
Answer:
anyone you just have to know how
Explanation:
¿De que ha dependido el rapido avance en el desarollo de nuevos materiales basados en formas alotropicas del carbon?
Answer:
ano pong topik po yan
what physical properties could be used to separate iron filings from table salt
Answer:
Iron is magnetic and Salt is non magnetic
So Salt dissolves in water and Iron doesn't
Each mineral group has a distinctive chemical feature such as
a. oxides are a metal combined with oxygen
b. sulfides are a metal combined with sulfur and oxygen
c. halides are a salt combined with a metallic atom
d. phosphates are made of phosphate polygons
Answer:
A
Explanation:
Which of the responses contains all the true
statements and no others regarding
electromagnetic radiation (light)?
which group of the periodic table is composed of inert gases
Answer:
Group 0
Explanation:
A cheerful teen willing to help,
stay salty,
stay positive...
The group zero of the periodic table is composed of inert gases.They are very unreactive So, they don't form molecules easily and are found as single atoms.
Which group of metals is inert?"Noble metals, such as gold, platinum, silver, and a few rare metals. Members of this class have little or no tendency to unite with oxygen in the free state and do not change composition when placed in water at a red heat.
Noble gas atoms already have complete outer shells and have no tendency to lose, gain, or share electrons. As a result, noble gases are inert and do not participate in chemical reactions.
Because their outermost shells are completely filled, zero group elements are inert. They have no tendency to lose, gain, or share electrons with other elements.
Thus, The group zero of the periodic table is composed of inert gases because they are unreactive.
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what is the molarity of an hcl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400 m naoh? group of answer choices 0.200 m 0.280 m 0.320 m 0.500 m
The molarity of an HCl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400M NaOH is 0.320 M.
HOW TO CALCULATE MOLARITY:
The Molarity of an acid when involved in a titration procedure can be calculated by using the formula below:M1V1 = M2V2
Where;
M1 = molarity of acid (M)M2 = molarity of base (M)V1 = volume of acid (mL)V2 = volume of base (mL)According to this question,
M1 = ?M2 = 0.400MV1 = 50 mLV2 = 40 mLM1 × 50 = 0.400 × 40
50M1 = 16
M1 = 16 ÷ 50
M1 = 0.32M
Therefore, the molarity of an HCl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400M NaOH is 0.32 M.Learn more at: https://brainly.com/question/8732513?referrer=searchResults
Which of the following sequences of elements would all have four valence electrons?
A.) B, Si, As, Te
B.) C, Si, Ge, Sn
C.) O, S, Se, Te
D.) Ga, Ge, As, Se
Answer:
Your answer should be B.) C, Si, Ge, Sn! I hope this helps you! :)
which of the following statement is correct for a group of a periodic table.
i} All elements have different valency.
ii} The atomic size decrease as we move down.
iii} The electropositivity increase down the group.
iv} The electronegativity increase down the group.
Answer:
I believe it is B
Explanation:
I am on this lesson too :)
Answer:
III Electropositivity increases down the group
Explanation:
please help :((
Which of the following atoms has the largest radius?
1. Na
2. H
3. Ar
4. P
5. F
6. AI
¿De que dependen las propiedades del grafeno?
¿De que ha dependido el rapido avance en el desarollo de nuevos materiales basados en formas alotropicas del carbon?
POR FAVOOR ES URGENTEEEEE
Answer:
di ko maintindihan anggulo ng isinulat
Each of these Ionic Compounds are named INCORRECTLY. 1. Find and describe the mistake 2. Correctly name the compound. CaCl2 - Calcium Chlorine CuS - Copper Sulfide Li3P - Trilithium Phosphide CuBr - Copper(II) Bromide NaOH - Sodium Hydrogen Oxide
Explanation:
The nomenclature of ionic compounds is given by:
1. Positive is written first. And if the metal atom has various oxidation states then its oxidation state is to be mentioned in brackets with help of roman numbers
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
1.) : Calcium chloride (Correct)
In the given compound, calcium has oxidation state of +2 and chlorine has oxidation state of -1.The name is correct.
2.) : Copper (II) oxide (Incorrect)
In the given compound,copper has the oxidation state of +1 and oxygen has oxidation state of -2.So ,the correct name will be Copper (I) oxide.
3.) : Lead (II) sulfide (Incorrect)
In the given compound, lead has the oxidation state of +4 and sulfur has oxidation state of -2. So ,the correct name will be Lead (IV) sulfide.
2. A student wants to calculate the heat gained of 100 grams of water in order to
calculate the specific heat of a metal in the following problem. The water is
heated from 25C to 50C when the metal is added. The specific heat of water is
4.18 J/gºC. Use Q=m x CXAT*
5,225 J
10,450 J
20,900 J
Taking into account the definition of calorimetry, the correct answer is the third option: The heat exchanged is 10,450 J.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
The amount of heat (Q) necessary to vary the temperature of a mass (m) of a substance is proportional to the change in its temperature (∆T) and to that mass. So, the equation that allows calculating heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c= 4.18 [tex]\frac{J}{gC}[/tex]m=100 gΔT= Tfinal - Tinitial= 50 C -25 C= 25 CReplacing in the expresion for calorimetry:
Q = 4.18[tex]\frac{J}{gC}[/tex]× 100 g× 25 C
Solving:
Q= 10,450 J
Finally, the correct answer is the third option: The heat exchanged is 10,450 J.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsin order for a circuit work there can be no _______ within the circuit?
how many protons would the element with the atomic number 10 contain
Answer:
10
Explanation:
Atomic number = No. of protons
Therefore, the number of protons of an element with an atomic number of 10, is also 10.
Can you answer my question in SCIENCE... Directions: Below are the reactants and products of photosynthesis. Choose the chemical symbol that matches the word.
Answer:
Water :H2O
Carbon dioxide :CO2
Oxygen :O2
Glocuse :C6H12O6
Answer:
water = H20
carbon dioxide = CO2
oxygen = 02
glucose= C6H1206
Explanation:
Trường hợp nào sau đây là chất tinh khiết
16 A particular light source gives off light waves with a measured wavelength of 2.0 x 10-7 m.
What is the frequency of the light source?
А 6.67 X 10-15 Hz
B 6.0 x 1011 Hz
с 1.5 x 1015 Hz
D Not enough information
Refer to the attachment
Light waves are part of the electromagnetic spectrum. The frequency of light therefore is 1.5 * 10^15 Hz.
What is light?
Light is an electromagnetic wave and we know that the speed of light is a constant which is 3 * 10^8 m/s.
Knowing this; v = λ * f
λ = wavelength
f= frequency of light
v = seed of light
f = v/λ
f = 3 * 10^8 m/s/2.0 x 10-7 m
f = 1.5 * 10^15 Hz
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Three fundamental laws of chemical combination
Answer:
the law of multiple proportions, law of definite proportions, and law of conservation of mass.
Explanation:
(Hope this helps can I pls have brainlist (crown)☺️)
when it is time to end a reflux, first choose... and then turn off the heat. choose... until the system has cooled.
Answer:
second one is better
Explanation:
system is very much hot in first state..so wait for cooling down the system..but these depend on the organic compounds and products you are using. sometimes we need to carryout further steps in hot state..then you can't wail it to cool down
Which statement describes a similarity between an apple and gasoline
Answer:
They both contain chemical energy, which people and cars convert into mechanical energy.
Explanation:
Answer:
B)They both contain chemical energy, which people and cars convert into electrical energy.
Explanation:
HAAAAAALP MEEEEEEEEEEE
Answer:
It would contain 10.
Explanation:
The atomic number: the number of protons.
Light energy travels in waves, originates directly from the Sun, and is used by plan
to make food. Scientist use light energy to create lasers for cutting, heating,
measuring. Light energy is so important that it is responsible for the existence
most life forms. Furthermore, light energy is the only visible form of energy. It ca
travel through air, space, water, and glass. Light travels in a straight line until
strikes an object or travels from one medium to another. As it travels from or
medium to another it appears to bend.
Which term is best used to describe the bending of light waves?
A
refraction
B
reflection
C
rotation
D
revolution
La
Answer:
A) Refraction , this is the correct answer.
Hope it helps!!
Answer:
A refraction. I'm an electrician building aspects they put circular cones through the building and where they bend they have refractors and so you can have a completely closed off building and the light will come through from the rooftops through these tubes and the light been through refractors to make it look like you have a moonroof
6) A 14.5 g sample of sodium chloride reacts with excess fluorine gas according to
the following chemical equation.
2 NaCl(s) + F2(g) → 2 NaF(s) + Cl2(g)
a. How many grams of sodium fluoride are produced?
b. How many grams of chlorine gas are produced?
The mass of chlorine gas produced by 14.5 grams of sodium chloride is 10.42 g.
The mass of chlorine gas produced by 14.5 grams of sodium chloride is 8.81 g.
The given parameters;
mass of the sodium chloride, = 14.5 g2NaCl(s) + F2(g) → 2NaF(s) + Cl2(g)In the reaction above, we can deduce the following;
molecular mass of 2Nacl = 2(58.44) = 116.88 g
molecular mass of 2NaF = 2(42) = 84 g
molecular mass of Cl2 = 71 g
The mass of sodium fluoride produced by 14.5 grams of sodium chloride is calculated as follows;
116.88 g of NaCl --------------- 84 g of NaF
14.5 g of NaCl ------------------- ?
[tex]= \frac{84 \times 14.5}{116.88} \\\\= 10.42 \ g[/tex]
The mass of chlorine gas produced by 14.5 grams of sodium chloride is calculated as follows;
116.88 g of NaCl --------------- 71 g of Cl2
14.5 g of NaCl ------------------- ?
[tex]= \frac{14.5 \times 71}{116.88} \\\\= 8.81 \ g[/tex]
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Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics?
Answer:
Elements in the same group has different physical properties such as boiling and melting points. However there are trends of their physical properties down the group.
Explanation:
You should look at the perdoic table to for extra help
The boiling points and melting points of the given elements does not support the claim that elements of the same group have similar physical properties.
What are boiling point and melting point?The boiling point of a substance is the temperature at which it changes from liquid state to gaseous state. Melting point is the temperature at which the substance changes from solid to liquid state.
Elements in the same group shows similar physical and chemical properties. But from the boiling and melting point we cant say that they are in the same group.
Elements in a group shows a trend in boiling point and melting point but cannot be distinguished with this from other groups.
Hence, boiling point and melting point of the elements do no support for the similar properties in a group.
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Your question is incomplete, but most probably your full question was,
Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics? (image uploaded)
the nucleus or center area of the atom contains two kinds of subatomic particles. which two?
Why are microwaves idea for transmitting satellite communication signals?
Answer:
Microwaves are best suited because
they have a higher frequency and small wavelength
Satellite communication and Earth observation from space benefit from microwaves that can pass through haze, light rain, snow, clouds, and smoke. Because they can penetrate the atmosphere, microwaves are used. Small wavelength and high frequency is employed for this.
Microwaves are radio waves with short wavelengths and frequencies in the gigahertz (GHz) range. They can send signals over great distances without any data loss thanks to their high frequency. Without producing signal overlap or interference, they may carry a wide range of frequencies.
Electromagnetic radiations include radio waves and microwaves. In communication, both are utilized. Television and radio programs are transmitted by radio waves, but mobile phones and Wi-Fi use microwaves. Radio waves are one of the several alternatives for satellite communication.
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