PLEASEEEE HELP MEEE
For the reaction 2H2 + O2 → 2H2O, how many grams of water are produced from 26.0 mol of hydrogen?
HURRY UP ANSWER MY QUESTION
Why does a balloon filled with gas become smaller when placed in a colder environment?
A.atoms / molecules speed up in the cold and thus push out on the balloon more
B.atoms / molecules slow down at lower temperatures and thus push out on the balloon less frequently and with less energy
C.atoms / molecules slow down in the cold and thus push out on the balloon more
D.atoms / molecules speed up in the cold and thus push out on the balloon less
Previous
Answer:
B
Explanation:
If you remeber a balloon in hot air, it pops. This is because the molecules are moving too fast and need more space to move, thus popping the balloon. If you put a balloon in cold air, then it shrinks, the molecules not moving fast enough and don't need as much space.
In a laboratory, Carlos places one plate with grape jelly and another plate with cooked brown rice inside an ant farm. The next day, he finds that both plates are filled with ants. Carlos wonders if there are certain household foods that are more effective than others at attracting ants. How could Carlos use the scientific inquiry process to determine which foods are most effective at attracting ants? Check all that apply.
Answer:
The Answers are: A. C. D.
Answer:
by making quantitative observations about the number of ants found on each plate of food
by comparing a plate of cooked brown rice to another household food such as peanut butter
by designing an experiment to test different foods and the number of ants each food attracts
Explanation:
It was right on edge
Subtract to find the temperature changes
for the water and the metal.
AT (water) =
AT (metal) =
Answer:
Explanation:
The temperature changes for the water and the metal is
ΔT (water) = 4.7°C
ΔT (metal) = - 72.9°C
Specific HeatThe quantity or amount of heat per unit mass required to raise the temperature of a body by one degree Celsius is known as specific heat. The unit of specific heat are joules or calories per gram per degree Celsius. Specific heat is an intensive property.
Calculate the temperature changesRelationship between temperature and heat is expressed as:
Q = mcΔT
where,
Q is heat energy in Joules (J)
m is mass (in grams)
c is specific heat in J/g°C
ΔT is change in temperature
Now calculate the temperature changes for the water
ΔT (water) = T(final) - T(initial)
= 27.1 - 22.4
= 4.7°C
Now calculate the temperature changes for the metal
ΔT(metal) = T(final) - T(initial)
= 27.1 - 100
= -72.9°C
Thus, from the above calculation we can see that the temperature changes for the water and the metal is
ΔT (water) = 4.7°C
ΔT (metal) = - 72.9°C
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The symbol ∆hf0 stands for
Answer:
standard heat of formation for compound
Explanation:
could some please help me with this? thank you
Answer:
C
Explanation:
Oxidation occurs at the anode. That means the element's oxidation number should increase. Mg has an oxidation number of 0, but Mg2+ has an oxidation number of 2, showing it was oxidized.
CAN I PLEASE GET SOME HELP PLEASE PLEASE HELP ME I WOULD APPRECIATE IT AND THANK YOU!! WICH of the following is an expression of Avogadro's law (k=constant) A)V=kn B)V=k/n C)nV=k D)V=k no
Answer:
Vn = k
Explanation:
[tex]Vn = k[/tex]
From the web :
Avogadro's Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant
Avogadro's Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant.
What is Avagrado's law?
According to Avogadro's Law, all gases have an identical number of molecules in an equal volume at a given temperature and pressure. Amedeo Avogadro, an Italian chemist and physicist, first described the law in 1811.
At 0 °C and 1 abm pressure, the molar volume of all ideal gases is 22.4 litres. If a gas's temperature and pressure remain constant, its volume will also grow as its amount increases.
If a gas's pressure and temperature are both constant, its volume falls as its volume of gas does. Every time you blow a balloon up, you demonstrate Avogadro's Law.
Therefore, Avogadro's Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant.
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How many grams are in 0.572 moles of glucose, C6H12O6
Answer:
103.00
Explanation:
1 mole of Glucose
6 C = 6 * 12 = 72 grams
12H = 12 * 1 = 12 grams
6O = 6 * 16 =96 grams
Total = 180 grams
0.572 moles of Glucose
1 mol of glucose = 180 grams
0.572 mols of glucose = x
x = 0.572 * 180
x = 103.00 grams
The atomic number of an atom is
a) The mass of the atom
b) The number of protons added to the number of neutrons
c) The number of protons
d) Negatively charged
Answer:
b, the number of protons added to the number of neutrons
Explanation:
When 100 g of 20°C water is mixed with 50 g of 50°C water in a closed system, what is the final water
temperature?
A 20°C
B) 30°C
C) 35°C
D50°C
The final temperature of a mixture of 100g of water at 20°C and 50g of water at 50°C is 30°C.
What is the principle of method of mixtures ?
The amount of heat lost by the hotter sample = The amount of heat gained by the cooler water sample
The amount of heat gained by the cooler water sample is: -
Q1₁= m₁c(T – T₁)
The amount of heat lost by the hotter water sample is: -
Q₂ = m₂c(T₂ - T)
Q₁ = Q₂
m₁c(T – T₁) = m₂c(T₂ - T)
T = (m₁T₁ + m₂T₂)/(m₁+ m₂)
Let the final temperature of the mixture of 100g of water at 20°C and 50g of water at 50°C be T.
m₁ = 100g
T₁ = 20°C
m₂ = 50g
T₂ = 50°C
The final temperature of water = (100*20+50*50)/(100+50)
= (2000+2500)/(150)
=4500/150
=30°C
Therefore , the final temperature of a mixture of 100g of water at 20°C and 50g of water at 50°C is 30°C.
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What happens to mass in an isolated system?
Answer:
In isolated sysrem mass remains constant.
Explanation:
Answer:
Yes is remains constant
Explanation:
Isolated systems can't make energy or matters come in or out, so the mass stays the same.
Think of it as a marble in a balloon once you tie it and shake the marble in the balloon, there is no extra marbles coming in nor is the marble out of the balloon so that mass(weight is the same.
Help!
A student dissolves 1 gram of sugar in 10 grams of water. She then determines the mass of the solution. What is the mass of the dissolved sugar and water?
a. less than 11 grams
b. more than 11 grams
c. 11 grams
d. It is not possible to tell from the data
Answer:
11 grams
Explanation:
What’s one renewable energy resource that can be used instead of fossil fuels ?
Answer:
Solar Energy & Wind Energy
Explanation:
These are renewable energy and can be used used in replacement for fossil fuels.
PLS MARK ME AS BRAINLIEST!!
When there is unequal sharing between two atoms of the electrons in a bond, which
type of bond is it?
Answer:
polar covalent bond
Explanation:
Explain the difference between layers and band.
Answer:
Foliation is developed by stress and fire while layering is developed by the embedding of fine and coarse deposits. Foliation is caused due to an alteration of minerals from pressure and heat while layering is developed by seasonal changes
Explanation:
Banding occurs when two different mineral compositions alternate in thin layers (typically 1 mm to 1 cm). The two types of layers typically contain the same minerals, but in different proportions, giving the rock a striped appearance. A foliation is defined by its banding.
What is foliation rocks?There are two major types of metamorphic rock textures: foliated and nonfoliated. Foliation in rock is caused by the parallel alignment of Platy minerals (such as Muscovite, Biotite, and Chlorite), Needle-like minerals (such as Hornblende), or Tabular minerals (e.g., feldspars). Because of the parallel alignment, the granite easily splits into thin sheets or layers. Foliation can be found in both aphanitic and phaneritic metamorphic rocks. A few foliated rocks also have bands.A banded rock has alternating thin layers of two different mineral compositions, with thicknesses ranging from 1 mm to 1 cm. The same minerals are found in both types of strata, but in varying amounts, giving the rock a striped appearance. A foliation is defined by its banding.To learn more about foliation, refer to:
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Which value gives the number of particles in 1 mol of a substance?
6.02 x 1021
6.02 x 1022
6.02 x 1023
6.02 x 1024
Answer: it's C 6.02×10²³
Explanation:
I got it right in edge
I AM GIVING BRAINLIEST! PLEASEEEEEEEEEEE HELPPPPP I NEEED HELPPPP PLEASEEEE
Find the molecular formula for a compound with-
4.04 g N, 11.46 g O, molar mass 108.0 g/mol.
? moles N =
? moles O =
N : O =
empirical formula =
molecular mass of empirical formula =
The molar mass ratio of (molecular formula/empirical formula) =
molecular formula =
Answer:
moles of N
4.04 g / 14.01 = 0.288
moles of O
11.46 / 16 = 0.72 moles
divide both of them by the lowest number of moles to get the ratio
0.288 / 0.288= 1
0.72 / 0.288 = 2.48
now multiply both by 2, to make it a whole number =
ratio = 2 : 5
empirical formula = N2O5
the molar mass of the compound = 108.01
molar mass of the empirical formula = 108.02
when you divide this to get the factor the factor is also 1, so you dont really change anything
FORMULA = N2O5
Explanation:
I had it written done from my school notes
I really hope this helps
How many kilograms of gasoline fill a 12.0-gal gas tank
Answer:
29.98kg
Explanation:
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg
29.98kg of gasoline fill a 12.0-gal gas tank
what is gasoline ?gasoline or gas or petrol a mixture of volatile, flammable liquid hydrocarbons which is derived from petroleum and used in many application like fuel in internal-combustion engines, solvent for oils and fats.
It is a by-product of the petroleum industry, used in automobile fuel due to its high energy of combustion and easily mix with air in a carburetor.
Gasoline is produced by distillation by separating the volatile substance, later on other designed process yield of gasoline from crude oil by splitting large molecules into smaller ones by cracking method.
12.0 gallons * (3.78541178 liters/gallon) * (1000 mL/liter) * (0.66 g/mL) * (1 kg/1000 g) = 29.98 kg of gasoline fill the tank.
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What are orbitals?
A. Energy levels occupied by neutrons
B. Areas within an energy level that are occupied by electrons
C. Regions of the atom that contain protons
D. Circular paths around the nucleus
Answer:
B. Areas within an energy level that are occupied by electrons
Explanation:
Its not A because there are different orbitals on each energy level.
Answer:
B
Explanation:
Match each element to its electron dot diagram. The symbol X represents the element. Refer to the periodic table if needed. fluorine sodium phosphorus magnesium One of the X's didn't work, but it had 2 dots on top, 2 on the right, 2 on the bottom, and 1 on the left.
Answer:
The atom with one outer most electron is sodium
The atom with two outermost electrons is magnesium
The atom with five outermost electrons is phosphorus
Explanation:
A dot structure of an atom shows the number of electrons present on the outermost shell of that atom. In order words, a dot structure shows the valence electrons present on the valence shell of an atom.
Sodium has an atomic number of 11, hence the electrons are arranged in three shells in the following order 2,8,1. This implies that one electron is present on it's outermost shell.
Magnesium has an atomic number of 12. Its electrons are arranged in shells in the order; 2,8,2. Hence, two electrons are present in its outermost shell.
Phosphorus contains 15 electrons(atomic number of 15), these electrons are arranged in shells in the order 2,8,5. Hence there are five outermost electrons present in phosphorus.
Answer:
1 dot sodium
2 dots Magnesium
7 dot Fluorine
5 dot Phosphorus
Explanation:
Which functional group defines a ketone?
−NH
−PO4
−Na
=O
The functional group that defines a ketone is =O and the correct option is option 4.
What are Ketones?
Ketones are a common functional group in organic chemistry. Ketones have important physiological properties. As a result, they are a part of several sugars and compounds involved in medicinal use such as cortisone, an anti-inflammatory.
In ketones, the carbonyl group has 2 hydrocarbon groups attached to it. These can be either the ones containing benzene rings or alkyl groups. Ketone does not have a hydrogen atom attached to the carbonyl group.
Therefore, the functional group that defines a ketone is =O and the correct option is option 4.
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Which of the following is an example of a mixture?
A. NaCl
B. CO2 + H2 + O2
Ос. Са
D. C6H1206
Reset Selection
Answer:
B.
Explanation:
CO2 + H2 + O2 - are 3 individual substances.
What is thought to be another cause of the large size of our brain compared to chimpanzees?
Answer:
Compared to early humans our brains seemed to have increased in size, and part of the cause may be because of things like Climage change, ecology and social competition
Explanation:
Which molecule is an alkyne?
A. 2-ethylhexane
B. 2-nonyne
C. trans-2-pentene
D. Pentane
Answer:Ethyne
Explanation:
Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom. Since both carbon atoms are linear in shape, all four atoms lie in a straight line.
2-nonyne molecule is an alkyne. Hence, option B is correct.
What is alkyne?Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon-to-carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.
Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom.
Since both carbon atoms are linear in shape, all four atoms lie in a straight line.
Hence, option B is correct.
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PLZ SEE ATTACHED AND I WOULD REALLY APPRECIATE IT! ANYONE GOOD WITH CHEM
Answer : The value of [tex]\Delta H_{rxn}[/tex] for the reaction is, -390.3 kJ
Explanation :
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The main chemical reaction is:
[tex]CH_4(g)+4Cl_2(g)\rightarrow CCl_4(g)+4HCl(g)[/tex] [tex]\Delta H_{rxn}=?[/tex]
The intermediate balanced chemical reaction are:
(1) [tex]C(s)+2H_2(g)\rightarrow CH_4(g)[/tex] [tex]\Delta H_1=-74.6kJ[/tex]
(2) [tex]C(s)+2Cl_2(g)\rightarrow CCl_4(g)[/tex] [tex]\Delta H_2=-95.7kJ[/tex]
(3) [tex]H_2(g)+Cl_2(g)\rightarrow 2HCl(g)[/tex] [tex]\Delta H_2=-184.6kJ[/tex]
Now we are reversing reaction 1, multiplying reaction 3 by 2 and then adding all the equations, we get :
(1) [tex]CH_4(g)\rightarrow C(s)+2H_2(g)[/tex] [tex]\Delta H_1=74.6kJ[/tex]
(2) [tex]C(s)+2Cl_2(g)\rightarrow CCl_4(g)[/tex] [tex]\Delta H_2=-95.7kJ[/tex]
(3) [tex]2H_2(g)+2Cl_2(g)\rightarrow 4HCl(g)[/tex] [tex]\Delta H_2=2\times (-184.6kJ)=-369.2kJ[/tex]
The expression for enthalpy change for the reaction will be,
[tex]\Delta H_{rxn}=\Delta H_1+\Delta H_2+\Delta H_3[/tex]
[tex]\Delta H_{rxn}=(74.6kJ)+(-95.7kJ)+(-369.2kJ)[/tex]
[tex]\Delta H_{rxn}=-390.3kJ[/tex]
Therefore, the value of [tex]\Delta H_{rxn}[/tex] for the reaction is, -390.3 kJ
Using the activity series provided. Which reactants will form products? Na > Mg > Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag Ag +NaNO3 Right arrow. Fe + Al2O3 Right arrow. Ni + NaCl Right arrow. Fe + Cu(NO3)2 Right arrow.
Answer:
D
Explanation:
To solve this we must be knowing each and every concept related to activity series. Therefore, Fe + Cu(NO[tex]_3[/tex])[tex]_2[/tex] reactants will form products. The correct option is option D.
What is activity series?We refer to the metal series in the image above as the activity series. This serves as a guide so that we can identify the byproducts of a metal displacement process. For displacement to take place, a metal must be placed over the other metallic combination.
Ag is significantly lower than Na in the series so, nothing happens. Since Al is above Fe, there is no response. Ni is below Na, hence no reaction will take place. A displacing reaction will happen because Fe is a greater active metal than copper.
Therefore, Fe + Cu(NO[tex]_3[/tex])[tex]_2[/tex] reactants will form products. The correct option is option D.
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a student is asked to draw an atom of sulfur on a board. the pictures below represents what the student drew. what is wrong with this sulfur atom
plzzzz help i need to finish up
Consider the unbalanced equation for the oxidation of butene. C4H8 + 6O2 CO2 + H2O For each molecule of C4H8 that reacts, how many molecules of carbon dioxide and water are produced?
two carbon dioxide molecules and two water molecules
four carbon dioxide molecules and four water molecules
two carbon dioxide molecules and four water molecules
four carbon dioxide molecules and two water molecules
Answer: Four carbon dioxide molecules and four water molecules
Explanation:
Answer:
D: four carbon dioxide molecules and two water molecules
Explanation:
There are four carbon dioxide molecules (CO₂) on the right side of chemical reaction, because there are four carbon atoms on the left side of balanced chemical reaction.
There are four water molecules (H₂O) on the right side of chemical reaction, because there are eight hydrogen atoms on the left side of balanced chemical reaction.
Which statement is an inference?
A) A thermometer shows that the air temperature is 56 degrees Fahrenheit.
B) A mineral sample of galena produced a gray-black streak when tested.
C) Based in previous data, ten hurricanes may occur in the year 2013.
D) A weather vane shows the wind is coming from the west.
Answer: C. Based in previous data, ten hurricanes may occur in the year 2013.
Explanation:
Inference can be explained as conclusion made from an existing evidence or facts. Option C, best fits an inference statement.
Answer:
C
Explanation:
because everything looks like opinions
A transformer has ten turns of wire on the input side and 50 turns of wire on the output side. If the input voltage is 120 V, what will the output voltage be?
Answer:
600 V
Explanation:
The transformer equation helps us to calculate the relationship between the ratio of the number of turns of coils in the input and output sources to their respective voltages.
It states that the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops in their coils.
Number of input turns/Number of output turns = input voltage/output voltage
10/50 = 120V/output voltage
output voltage = 120 V/0.2
Output voltage = 600 V