Help? i need to finish my assignment :>
Answer:
B 2
Explanation:
I checked it and it’s right hope this helps!!
Calculate the mass of 0.2 moles of zinc nitrate.
Answer:
mass = 37.8 g
Explanation:
mass = mol × molar mass
mol = 0.2
molar mass = Zn(NO3)2
Zn = 65
N = 14
O = 16
substitute the values into Zn(NO3)2
Zn(NO3)2
= 65+2[ 14+3(16) ]
= 65 + 2(62)
= 65 + 124
= 189 g/mol
mass
= mol × molar mass
= 0.2 mol × 189 g/mol
= 37.8 g
Neon is located in the last group of the periodic table. How many valence electrons
Answer:
8 valence electrons
Explanation:
Neon is a noble gas, and all noble gases have 8 valence electrons. The same goes for its group; all elements in the last group of the periodic table have a full valence shell--8 electrons.
ALUMINUM (AI)
+ NITRATE (NO3)
Answer:
Al(No3)3
Explanation:
hope this is correct....
list down some examples of solutions that we need to prepare/make in the form of unsaturated and saturated solution
Answer:
1)Carbonated water is saturated with carbon, hence it gives off carbon through bubbles.
2)Adding sugar to water until it no longer dissolves creates a saturated solution.
3)Continuing to dissolve salt in water until it will no longer dissolve creates a saturated solution.
An unsaturated tea and sugar solution would be one into which you could add more sugar and have the sugar still dissolve
true or false: heat and pressure combine to form a volcanic eruption
Answer:
true hope that helps
Explanation:
Which of these is a characteristic of a radioactive nucleus?
Answer:
The Answer is option D
Explanation:
The nucleus of a radioactive element is unstable. The nucleus will break down over time, reducing the amount of the element remaining.
state with reasons the most suitable methods for collecting hydrogen
Answer:
Upward delivery or downward displacement of air
Explanation:
The method of collection of a gas is dependent on it's density.
Gases that are less dense than air are collected by upward delivery or downward displacement of air while gases that are denser than air are collected by downward delivery or upward displacement of air.
Hydrogen is less dense than air hence it is collected by upward delivery or downward displacement of air.
What mass of Ca(OH)2 would you need to make 300.0mL of a 1.2M solution of Ca(OH)2
Answer:
is there a picture.....????
An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?
OA.
10
OB.
20
O C.
30
D. 0
O E. 200
10
subtract the atomic mass from the atomic number
) Calculate the Gibbs energy change for the formation of propane at 298K.Given that ∆H for propane is -103.85KJ/mol.∆S for the reaction is - 269.74KJ/mol.
Answer:
ΔG = 80,278.67 J/mol
Explanation:
Given:
∆H = - 103.85KJ/mol
∆S = - 269.74KJ/mol
T= 298 K
The Gibbs energy change (ΔG) is calculated as follows:
ΔG = ΔH - TΔS
ΔG = (-103.85KJ/mol)-298K(- 269.74KJ/mol)
ΔG = (-103.85KJ/mol) - (-80,382.52 J/mol)
ΔG = 80,278.67 J/mol
Metals make what type of ions
Answer: Metal atoms lose the electron/ electrons in their highest energy level and become positively charged ions.
Answer:
Cations
Explanation:
Cations (positively-charged ions) and anions (negatively-charged ions) are formed when a metal loses electrons, and a nonmetal gains those electrons. The electrostatic attraction between the positives and negatives brings the particles together and creates an ionic compound, such as sodium chloride.
Key Terms:
➡An anion can be defined as an atom or molecule that is negatively charged. ➡A cation can be defined as an atom or molecule that is positively charged. ➡They have an opposite electrical charge, therefore they get attracted to each other.
When a liquid is cooled, the kinetic energy if the particles A. Decrease B. Increases C. Remains the same. The force of attraction between the particles A. Decrease B. Increases C. Remains the same , the space between the particles A. Decrease B. Increases C. Remains the same
Answer:
(A.) Kinetic energy decreases(B.) Force of attraction increases(C.) Space between particles remains the sameExplanation:
Kinetic energy is the energy in motion. Cooling if liquid would cause decreased temperature and hence slow down the oscillation of the particles.
Likewise, increased heat reduces the force of attraction between said particles, which allowed for their free movement. So the cooling would have opposite effect.
Finally, the space between the particles would remain the same as it was originally, as their force of attraction is increased in the cooling process, they would take the form they are held in.
I hope this was helpful and concise?
how is mechanical energy related to potential and kinetic energy
Answer:
Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position). A moving car possesses mechanical energy due to its motion (kinetic energy).
Explanation:
An atom is
a. the smallest unit of matter that maintains its chemical identity.
b.the smallest unit of a compound.
c.always made of carbon.
d.smaller than an electron
Answer:
A. The smallest unit of matter.
Explanation:
Atoms make up everything and are the smallest unit of all units.
please help!!
How many moles of NO2 are equivalent to 74.3 grams of NO2?
(N = 14.01 g/mol, O = 16.00 g/mol)
Answer:
= 1.615 moles
Explanation:
I did it on a test and got it right
Which substance is the precipitate?
Answer:
In chemistry, a precipitate is an insoluble solid that emerges from a liquid solution. The emergence of the insoluble solid from solution is called precipitation. Often the precipitate emerges as a suspension. Precipitates can form when two soluble salts react in solution to form one or more insoluble products.
Explanation: Hope this helps! :>
What unit is mass generally measured in
Answer:
kilograms
Explanation:
hope this helps, pls mark brainliest :D
Answer:kilogram
Explanation:
I got the smarts
Help!! 8th grade science (for a grade)
Answer:
I DONT GET IT IETHER
Explanation:
DONT GET IT
How are plant and animal structures similar?
Answer:
I think they both need water and sun light to stay alive
Explanation: Animals need water so they can have energy and they have extra energy when they are in the sun they have more energy
1)
v (m/s)
9.6
다
2.4
0
6.0
10.0
18.0 (5)
What two quantities must stay the same in order for an object to have a constant velocity?
A)
The speed and kinetic energy must be constant.
3
B)
The speed and mass of the object must be constant.
The speed and direction of travel must be constant.
D)
The force applied to and direction of travel must be constant.
Answer:
A
Explanation:
a is the right answer abi
When a cold front is approaching, what happens?
Answer:There is colder and drier air coming
Explanation:
Answer:
Cold fronts generally move from northwest to southeast. The air behind a cold front is noticeably colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.
Explanation:
How is radiation different from conduction?
SELECT AN ANSWER
Radiation is the transfer of heat through molecular contact, and conduction is the transfer of energy by waves.
Radiation is the transfer of energy by waves, and conduction is the transfer of heat through contact with air.
Radiation is the transfer of energy by waves, and conduction is the transfer of heat through molecular contact.
Radiation is a type of heat transfer in the atmosphere as opposed to conduction, which does not transfer energy.
Answer:
Radiation is the transfer of energy by waves, and conduction is the transfer of heat through contact with air.
Explanation:
Conduction is the transfer of thermal energy through direct contact. Radiation is the transfer of thermal energy through thermal emission.
Croquet balls must have a mass of 0.50 kg. A red croquet ball, moving at 10
m/s, strikes an at-rest green croquet ball head-on. The red ball continues
moving at 1.5 m/s after it hits the green ball. What is the final speed of the
green ball?
O A. 5 m/s
B. 8.5 m/s
C. 1.5 m/s
O D. 15 m/s
SUS
The final speed of the green ball : 8.5 m/s
Further explanationGiven
mass of Croquet ball = 0.5 kg
v₁= 10 m/s
v₁'= 1.5 m/s
Required
the final speed
Solution
The law of conservation of momentum
m₁v₁ + m₂v₂ = m₁v₁ '+ m₂v₂' (1=red croquet ball, 2=green croquet ball)
v₂=0 (at rest)
Input the value :
[tex]\tt 0.5\times 10+0.5\times 0=0.5\times 1.5+0.5\times v_2'\\\\5=0.75+0.5v_2\\\\4.25=0.5v_2\rightarrow v_2=8.5~m/s[/tex]
identify the type and number of atoms in each molecule of the reactants and products.
CaCO3 -> CaO + CO2
Answer:
CaCO3: 1 calcium 1 carbon 3 oxygen
CaO: 1 calcium 1 oxygen
CO2: 1 carbon 2 oxygen
To see the number of atoms of any element in a particular molecule or compound, we need to multiply the stoichiometry that is written in front of the molecule to the number that is written on the foot of that element. The number of atoms of calcium, carbon and oxygen are 1, 1, 3.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
The balanced reaction is
[tex]CaCO_{3}\rightarrow CaO + CO_{2}[/tex]
There are three types of element present in this reaction: calcium, oxygen and carbon
Number of atoms of calcium on reactant and product side is 1
Number of atoms of carbon on reactant and product side is 1
Number of atoms of oxygen on reactant and product side is 3
Therefore, the number of atoms of calcium, carbon and oxygen are 1, 1, 3.
To know more about atom, here:
https://brainly.com/question/13518322
#SPJ2
Pretend you are visiting the equator and it is 12pm. When you look up at the sun, it is exactly over your head. You call a friend on the phone, and your friend says it is also 12pm at their house, but the Sun is not exactly overhead. It is actually a little lower in the sky. Are the longitude lines and latitude lines where you are the same as or different from the longitude lines and latitude lines where your friend is. How do you know?
Answer:
Different
Explanation:
Surely, the longitude lines and latitude lines where you are different from the longitude lines and latitude lines where your friend is. This is evident from the fact that sun's position in the sky is different at same time of the date. Your are the equator, then your friend must be above equator in northern hemisphere or below in southern hemisphere.
A student adds different amounts of ice to four samples of water and records the change in temperature after 30 minutes. What is the independent variable in this investigation?
Answer:
Amount of ice
Explanation:
When we talk about independent variable, we mean that variable in an experiment that is manipulated and its effect on the dependent variable is measured.
In this case, the amount of ice in each water sample determines the temperature of each sample. Hence the amount of ice is the independent variable.
Answer:
ice cubes added
Explanation:
NEED HELP!!!
Which word best describes a form of energy associated with molecules in motion and heat?
Thermal energy
Kinetic energy
Vaporization
Condensation
The particles are in a fixed position. What state of matter is this?
Answer:
The state of matter is solid
Explanation:
The enthalpy of combustion of octane is -5470 kJ/mol. Octane (formulae C8H18) was used to heat some water in a copper can. The amount of octane used up was 0.1 g. The amount of water in the can was 100 cm3 . a) Find the moles of octane which was used up. (Show calculations)
Answer: 0.0009 moles of octane were used up.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
Given mass of octane = 0.1 g
Molar mass of octane = 11.23 g/mol
Putting in the values we get:
[tex]\text{Moles of octane}=\frac{0.1g}{114.23g/mol}=0.0009moles[/tex]
Thus 0.0009 moles of octane were used up.