Answer:
with a double line
how much heat energy is required to melt 40g of sodium chloride at its melting point
Answer:
173.2 C
Explanation:
have a good day
21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.
The standard enthalpy of fusion of NaCl is 0.52 kJ/g, that is, it takes 0.52 kJ of heat to melt 1 g of NaCl at its melting point. The heat required to melt 40 g of NaCl is:
[tex]40 g \times \frac{0.52kJ}{g} = 21 kJ[/tex]
21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.
You can learn more about enthalpy of fusion here: https://brainly.com/question/10345467
One difference between mixtures and pure substances is that
A)
mixtures can be physically separated.
B)
mixtures are made of one type of atom.
pure substances have no chemical bonds
D)
pure substances can be physically separated,
ning
Answer:
I think b but I could be wrong
Answer:
a
Explanation:
i just took it
This process of heat transfer by conduction would NOT work __________
A) in space.
B) in a solid.
C) under water.
D) in the atmosphere.
Science
Answer:
B and C are the correct answers.
What is a coordinate bond
Answer:
Explanation:
The coordination or coordinate bond, also known as a dative covalent bond or bipolar bond, is a covalent bond in which a pair of electrons shared by two atoms is contributed by only one of them. The atom that gives the pair of electrons is called the giver and the recipient, receiver.
Answer:
a type of covalent bond between two atoms in which the bonding electrons are supplied by one of the two atoms
Explanation:
what is the first step when scaling a graph?
Answer: the lll newton law
Explanation:
it jus is
KNO, + H.CO, – K. CO, + HNO
Answer:
Just Try ur best ok
Explanation:
4. DNA replication:
a. Occurs in the cytoplasm of the cell
b. Does not require proteins
C. Takes place in the nucleus of the cell
Is constantly happening in a cell
Answer:
A.
Explanation:
Answer:
b
Explanation:
What are the three basic forms of matter?
Answer:
Solid, Liquid, and Gas!
Explanation:
According to the big bang theory, what was distributed in every direction as the universe expanded?
Answer: la masa porque a lo largo del tiempo se fueron creando planetas por todo el universo
Explanation:
Which is heavier? A pound of cotton candy or a pound of marbles
I NEED HELP FAST
complex conversions between units may require using __________ conversion factor
Answer:
More than one
Explanation:
Answer:
More than one
Explanation:
Quizlet says so
Please help this is due tomorrow, I will give brainliest
Answer:
both are chemical changes
Answer: both are chemical changes
Explanation:
Which is the best way to determine if an object is made of pure silver
Answer:
The Nitric Acid Test
Explanation:
The Nitric Acid Test is used to check if silver is pure or plated. To do so, file a small part of the item in a discreet area where it cannot be seen. Apply a few drops of nitric acid. If the area turns into creamy white, the silver is pure or sterling. If green, it is probably fake or silver-plated.
What is the proper nuclear symbol for the the isotope that has 47 protons, 61 neutrons, and 46 electrons?
will someone help me, please
Answer:
c makes sense
Explanation:
if your just sitting there looking at it melt, thats not helping
Answer:
A
Explanation:
Different sizes of ice cubes will result in different lengths of time in staying solid. A bigger ice cube will stay solid for longer than a smaller one.
right
a force of 20 newtons (N).
Mass 10 kg
Force
20 N
22. Using the equation below, calculate the acceleration of
the cart in meters per second squared (m/s 2)
Force = Mass X Acceleration
m/s 2
Help ASAP
Which one of these is an example of cell division at work?
A: A tree grows taller.
B: A plant dies.
C: A dog digests food.
D: A muscle contracts.
Answer: A tree grows taller.
Explanation: Cells divide for many reasons. They may divide for growth, death, or to replace something. The cells divide when growth is happening, to allow to produce more cells. For example: When a tree grows taller the cells divide so they can produce more cells. The places in trees where these cell divisions happen, are called “Meristems”. This is where all the activity happens.
please let me know if this helps! have a great day!
Match each term to its correct description
1) Limiting reactant
2) Theoretical yield
3) Excess reactant
a) Reactant that has some leftover at the end of the reaction
b) Reactant that is entirely used up in the reaction
c) Mass of product that can be made by the given masses of reactants
Answer:
C
A
B
Explanation:
Excess reactant: Reactant that has some left over at the end of the reaction
Limiting reactant: Reactant that is entirely used up in the reaction
Theoretical yield: Mass of product that can be made by the given masses of reactants
The terms have been correctly matched to their descriptions as follows:
Limiting reactant: b) Reactant that is entirely used up in the reaction.Theoretical yield: c) Mass of product that can be made by the given masses of reactants.Excess reactant: a) Reactant that has some leftover at the end of the reaction.What is a Reactant?A reactant is a chemical compound or element that participates in a chemical reaction.
The limiting reactant is completely used up after the reaction while the excess reactant is the compound or element that is much more than what is normally required to complete the reaction.
The theoretical yield is the maximum quantity of the product that can be formed by the reactants.
Learn more about reactants here:
https://brainly.com/question/6421464
When Juan got home from school, he noticed a foul smell coming from the kitchen. He decided to investigate the smell and found fruit sitting on the counter. There was evidence that a chemical reaction had occurred. When he looked at the fruit, he saw that it had turned brown and was soft to the touch. Write a short claim evedence and reasoning. If you could separate them it would be geat
Answer:
See explanation
Explanation:
A chemical reaction is said to have occurred when there is a permanent, irreversible change in a substance.
Considering the fruit in the question, the changes in the fruit can not be reversed. Nothing can ever be done to return the fruit to its original form. This ultimately shows that a chemical reaction has taken place.
Secondly, the occurrence of a chemical reaction can be confirmed by evolution of a gas. The foul smell that filled the kitchen is the gas evolved during the chemical reaction involving the rotten fruit.
wich represents a element
carbon monoxide: CO
water:H2O
salt:NaCl
copper: Cu
Chose all of the correct statements pure vs mixture
Answer:
I think that a pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.
Explanation:
how many valence electrons does hydrogen have
Answer:
one valence electron
Explanation:
Each hydrogen atom has one valence electron and is univalent.
why is hydrogen not used as fuel for domestic purposes
Explanation:
It is because hydrogen is a highly combustible and it reacts explosively when it comes in contact with air. And hence as a result, storing of the hydrogen gas is difficult and is dangerous at the same time.
2. What is the total energy equation?
Total energy = kinetic energy * potential energy
Total energy = kinetic energy - potential energy
Total energy = kinetic energy + potential energy
Total energy = kinetic energy / potential energy
Answer:
Kinetic energy + Potential energy
Based on the article “Will the real atomic model please stand up?,” why did J.J. Thomson experiment with cathode ray tubes?
A. to specifically identify the nucleus as a separate part of an atom
B. to determine that electric beams in cathode ray tubes were actually made of particles
C. to prove John Dalton and Democritus wrong
D. to determine the exact energy output of cathode ray tubes
Answer:
B. to determine that electric beams in cathode ray tubes were actually made of particles
Explanation:
Answer:
B. to determine that electric beams in cathode ray tubes were actually made of particles
Explanation:
edg 2020
which of the following CANNOT be classified as a substance? A. table salt B. air C. nitrogen D. gold
Answer:
C. Nitrogen
Explanation:
All of the other options are mixtures making them substances, but nitrogen is an element. (while gold is an element, there are often times that gold is mixed with other elements, creating a substance)
1. A substance has a mass of 5.55 g and a volume of 3.00 cm”. Determine the density of this
substance and then use Table Sto identify the substance.
I need help please
Answer:
1.85 g per cm^3
The substance is Beryllium(if it is a single element, and not a compound)
Explanation:
Which is a property of barium (Ba)?
A. It does not conduct electricity.
B. It is brittle as a solid.
C. It rarely reacts with other elements.
D. It is very reactive.
Answer:
i think but i am not sure but according to me it mainly reacts yo non metals and i think its very reactive if my answer is wrong then comment below this question i will see it and i will get an opportunity to learn something new
What element has 80 protons, 81 neutrons, 79 electrons?
Answer:
The element will be [tex]^{161}_{80}X[/tex]
Explanation:
Given that,
Number of proton = 80
Number of neutron = 81
Number of electron = 79
We know that,
The atomic number is equal to the number of proton.
So, the atomic number is 80.
According to atomic number,
The element will be mercury.
We need to calculate the atomic mass
Using formula of atomic mass
[tex]atomic\ mass=atomic\ number+number\ of\ neutron[/tex]
Put the value into the formula
[tex]atomic\ mass=80+81[/tex]
[tex]atomic\ mass=161[/tex]
We need to find the element
Using atomic mass and atomic number
[tex]atomic\ mass\ number A=161[/tex]
[tex]atomic\ number Z=80[/tex]
So, the element will be
[tex]^{A}_{Z}X[/tex]
Put the value of A and Z
Hence, The element will be [tex]^{161}_{80}X[/tex]
(6.2 x 10 5 ) / (2.5 x 10 -3 ) =
(6.2 x 10 5 ) x (2.5 x 10 -3 ) =
solve each scientific notation
Answer:
651/22 and 14322
Explanation: