Which of the following represents an element?
If 1. 8 moles of sodium are present, how many moles of zinc are produced?
I need this ASAP :-(
The group number corresponds to _________________________.
A. Number of shells
B. Number of valence electrons
C. Atomic number
D. Atomic mass
Answer:
B
Explanation:
Group number corresponds to number of valence electrons, atomic number corresponds to number of protons and period number corresponds to number of shells
what is the molar mass of cobalt (II) nitrate?
Answer:
182.943 g/mol
Co(NO3)2 ⇒ Co, NO3, 2 (Cobalt and 2 Nitrate)
Multiply the number of grams in the mass formula and broken compounds into the base number.
Your answer is 182.943 grams.
Answer:
182.94 g/mol
Explanation:
hope this helps :)
A substance is a base if it has a pH value greater than Ck-
12
Answer:
pH means power of hydrogen. 1.0 Click to let others know, how helpful is it it is a logarithmic scale used to determine acidity or basicity or aqueous solution. if pH value of a substance is 13 then it means that the substance is basic in nature.
10 POINTS!
Oxygen gas is
003
OH 20
002
answer is o²
please agree my answer and provide me more question
How many moles are there in a 7.00 L of a gas at a certain temperature and pressure, if 0.369 moles of the same gas at the same conditions occupies 9.75L?
Answer: 200
Explanation:
It is 200 because 1 mole +1mole is a rat and a rat is 200.
As a wave passes a piece of cork floating on the surface, the cork bobs up and down but remains in more or less the same position. This up and down motion is representative of...Select one:
a. a transverse wave.
b. a compression wave.
c. a sound wave.
d. a breaker wave.
Answer:
a transverse wave
Explanation:
helppp me!!!
why a multicellular organism needs specialized cells to survive
Answer:
Cells function differently in unicellular and multicellular organisms. A unicellular organism depends upon just one cell for all of its functions while a multicellular organism has cells specialized to perform different functions that collectively support the organism.
What type of bonds are located between the nucleotides found in opposing DNA strands (i.e. the strands that are across from each other)?
Group of answer choices
van der waals
phosphodiester
hydrophobic
ionic
hydrogen
Answer:
hydrogen bond are found between nucleotides
Chlorine gas occupies a volume of 1. 2 liters at 720 torr pressure. What volume will it occupy at 1 atm pressure? Note: 760 torr = 1 atm
I NEED HELP!! (mostly w/ torr and atm part)
Answer:
V2 = 1.14
Explanation:
V1 = 1.2L
P1 = 720 torr (÷ by 760 to get atm. Because 1 atm equal 760 torr) = 0.95 atm
P2 = 1 atm
V2 =?
Follow the equation below to solve this question
P1V1 = P2V2
0.95 x 1.2 = 1 x V2
1.14 = V2
So 1.14 is the answer!
help!
Upon hitting a fixed boundary, a wave is sent back with a phase change of _______ °.
A. 0
B. 180
C. 90
D. 45
Logan is comparing the characteristics of different types of organisms. Which best describes a difference between insects and bacteria?
Оа Bacteria require energy to perform life functions while insects do not.
Ob Insects require energy to perform life functions while bacteria do not.
Ос Bacteria are made of one cell, while insects are made of many cells.
Od Insects are made of one cell, while bacteria are made of many cells.
Answer:
Ob Insects require energy to perform life functions while bacteria do not.
Explanation:
hope this help
Nature versus nurture” can also be described as???
Explain why the process of differentiation is not similar to the process of crossing over?
Answer:
hope it will help u
Explanation:
Matk me as brainlist plssaa
If you had 0.2M solutions of nitric and carbonic acids, which solution would have a lower pH?
Why?
0.2 M each of nitric acid and carbonic acid will have the same pH.
pHThe pH of substances is mathematically given as:
pH - -log [H+]
Nitric and carbonic acid dissociates according to the following:
HNO3 ---------> H+ + NO3-
H2CO3 -------> H+ + HCO3-
Thus, both acids ionizes to produce the same number of moles of H+, thus, producing the same pH
More on pH can be found here: https://brainly.com/question/491373
1) What gives an objedt gravity?
2) Why do you feel the force of Earth's gravity?
3) What two properties affect the strength of gravity?
4) If the mass of an object increases, how is the force of gravity effected?
5) What happens to the gravity between two objects when the distance
between them increases?
Help
I am very bad :(
1) the mass of an object gives gravity, the more massive an object is the more gravity it has on the things around it
2)the earth's mass is so much greater than our own that we feel it's gravity stronger than say the moon which has a smaller mass than the earth
3) mass and how far away you are from the object
4)as mass increases so does gravity (sorry I do not remeber the equation but there are some specific ones for different situations between two massive objects)
5) when distance increases, gravity decreases (again I do not remeber by how much)
can water stay liquid below zero degrees Celsius? how can glass be a liquid if its so hard? what made the hole in the ozone go away?
What is the mass of 5 moles of He (g)
Answer:
the mass of 5moles of He is ; 1 mole =2g therefore 5moles=5*2=10g
why was it important to heat your hydrate gently for 5 minutes before heating it strongly for 10 minutes
Which statement about alkanes is not correct?
A Alkanes are unsaturated hydrocarbons.
B Alkanes burn to release heat energy.
C Alkanes form carbon dioxide and water when they burn.
D Alkane molecules contain only single bonds.
Answer:
A
Explanation:
Alkanes are saturated hydrocarbons. The rest are also properties of Alkanes
Which is greater: the number of atoms in one mole of carbon, or the number of atoms in one mole of iron
The number of atoms in one mole of iron is greater than the one of carbon
Explanation:
This is because carbon has an atomic number of 6 while iron has a greater atomic number
Answer:
they are both the same
Explanation:
they are both 1 mole
What are the reactants in the reaction below? (select all that apply)
Answer:
[tex]C_{6}[/tex][tex]H_{12}O_{6}[/tex] + 6[tex]O_{2}[/tex]
Explanation:
The reactants are on the left side of the equation and it includes Glucose and Oxygen
in which section(s)/point(s) is the car accelerating?
Answer:
b-c and d-e
Explanation:
At these points/sections, uneven distances are covered in equal intervals of time.
Therefore, velocity is not constant => it is accelerating
What is the volume of 5.40 mole of O2?
The volume occupied by 5.40 mole of O2 is 120.96 L.
What is molar volume?The term molar volume refers to the volume of one mole of a gas. According to Professor Avogadro, the volume of one mole of a gas is 22.4 L.
Now, we are asked to find the volume of 5.40 mole of O2.
If 1 mole of O2 occupies a volume of 22.4 L
5.40 mole of O2 occupies 5.40 mole * 22.4 L/1 mole = 120.96 L
The volume occupied by 5.40 mole of O2 is 120.96 L.
Learn more about molar volume: https://brainly.com/question/4172228
What is any element that is a good conductor of heat and electricity and forms bonds/cations with non-metals?
A. Metal
B. Non-metal
C. Metalloid
What type of chemical reaction is Cl2 + Cu → CuCl2?
I am not sure if it is Double displacement.
Answer:
Combination Reactions
Explanation:
That's not Double Replacements because DR is two different things change places with each other.
EX: A-B + C-D ---> A-D + C-B
Cl2 + Cu → CuCl2
This is Combination Reactions because CR is two or more things come together to make a single larger thing.
EX: A + B ---> A-B
A 10,0-L cylinder of gas is stored at room temperature (20.0°C) and a pressure of 1800 psi. If the gas is
transferred to a 6.0-L cylinder, at what temperature in CELCIUS would it have to be stored in order for the
pressure to remain at 1800 psí? Reminder, convert your temperature to Kelvin before you begin the problem.
(Please put units)
Considering the Charles' law, the gas would have a temperature of -109.2 C.
Charles' lawFinally, Charles' law establishes the relationship between the volume and temperature of a gas sample at constant pressure. This law says that the volume is directly proportional to the temperature of the gas. That is, if the temperature increases, the volume of the gas increases, while if the temperature of the gas decreases, the volume decreases.
Charles' law is expressed mathematically as:
[tex]\frac{V}{T} =k[/tex]
If you want to study two different states, an initial state 1 and a final state 2, the following is true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Temperature of the gas in this caseIn this case, you know:
P1= 1800 psiV1= 10 LT1= 20 C= 293 K (being 0 C= 273 K)P2= 1800 psiV2= 6 LT2= ?You can see that the pressure remains constant, so you can apply Charles's law.
Replacing in the Charles's law:
[tex]\frac{10 L}{293 K} =\frac{6 L}{T2}[/tex]
Solving:
[tex]\frac{10 L}{293 K} T2=6 L[/tex]
[tex]T2=\frac{6 L}{\frac{10 L}{293 K} }[/tex]
T2=163.8 K= -109.2 C
The gas would have a temperature of -109.2 C.
Learn more about Charles's law:
https://brainly.com/question/4147359?referrer=searchResults
Use the table of data for a decomposition reaction to answer the question Concentration (C) at T1 (g/L) C at T2 (g/L) C at T3 (g/L) Cat T4 (g/L) 100 300 50 50 Reactant 100 0 125 125 Product 1 100 125 125 0 Product N In a decomposition reaction a reactant breaks down to form two products. At which time did the system first reach chemical equilibrium? (1 point)
Based on the nature of chemical equilibrium, the system reached equilibrium first at the time T2.
What is chemical equilibrium?Chemical equilibrium refers to the state of a reversible chemical reaction in which the rate of forward reaction for the the formation is equal to the rate of backward reaction for the formation of reactants.
In the table of the decomposition reaction given above, the system reached equilibrium first at the time T2 when the concentration of the reactant and products were the same.
Learn more about chemical equilibrium at: https://brainly.com/question/5081082
Answer:
T3
Explanation:
I've taken the test
25 POINTS! How does bond energy determine whether a chemical reaction is exothermic or endothermic?