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:
how many valence electrons does hydrogen have
Answer:
one valence electron
Explanation:
Each hydrogen atom has one valence electron and is univalent.
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:
Jack, an Investigator, wants to prove that a certain suspect was present at the crime scene when the crime was committed. What kind of
evidence should he look for?
Jack should look for __________ evidence because the analysis of such evidence can prove whether the person was present when the crime
was being committed. This evidence refers to tiny fragments of material that can be transferred from a human to a human or human to a
location
(forensic science question)
Answer: TRACE evidence
Explanation: Any evidence that can be transferred from one person to another or one person to a place is trace evidence. Also I took the test.
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
Use the diagram to select the one true statement about the
rock layers
Use the following diagram to answer questions 3-6.
A. A occured after D
B. C is younger that B
C. C occured before D
D. A is older than B
Answer:
a is occured after d i think
What is the proper nuclear symbol for the the isotope that has 47 protons, 61 neutrons, and 46 electrons?
Calculate the oxidation number of sulphur in H2SO4
Answer:
42
Explanation:
my brother said
which element is most likely to have an oxidation number of -2?
A. F
B. NE
C. CA
D. O
Answer:
D. O
_________________________________
F ----------¢ - 1
Ne --------¢ 0
Ca --------¢ + 2
Answer:
D. O
Explanation:
The state department of health manages issues
related to which of the following? Check all that
apply.
Answer:
water quality, nursing home safety, and emergency preparedness
Explanation:
i just answered it
What is the equation for torque?
Answer:
greater
Explanation:
increase, for example a door handle. imagine how much force u need to open it if it was in the middle of the door? more u need.
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
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:
A neutral atom of nitrogen has electrons in energy level(s):
Select one:
O a. 1 only
O b. 2 only
O c. 1 and 2
O d. 1, 2, and 3
Answer:
c
Explanation:
Nitrogen is in period 2, and has electrons in both 1 and 2.
The electron seeks to go up to energy level n = 2 from level 1, which is the initial energy level. Since the second energy level has more energy than the first, the electron must gain energy to travel from n = 1 to n = 2. A neutral atom of nitrogen has electrons in energy levels are 1 and 2.
What is energy level ?Any discrete value from a set of total energy values for a subatomic particle constrained by a force to a finite space or for a system of such particles, such as an atom or a nucleus, is referred to as the energy level, also known as the energy state, in physics.
"Energy levels" refer to the areas around the nucleus where an atom's electrons are positioned. The 3-dimensional region around the nucleus where electrons are most likely to be is represented by an energy level.
Every component of the cycle of wellness depends on energy. Our attitude and physical health both get better as we get more energy. Connecting with people, exercising, and feeling driven to work hard and accomplish personal objectives are all more likely.
Thus, option C is correct.
To learn more about energy level, follow the link;
https://brainly.com/question/17396431
#SPJ2
Help
I don't understand
I think that is A and D ?
Compound I --> 75g total, 52.46g iron, 22.54g oxygen, Compound 2 --> 56g total, 43.53g iron, 12.47g oxygen
PLEASE HELP
Answer:
1*6
Explanation:
How many atoms are present in 3 moles of chromium?
O 52.0 atoms
O 6.02 x 1023 atoms
O 1.80 x 1023 atoms
O 1.80 x 1024 atoms
Answer:
1.80 x 10^24 atoms
Explanation:
3moles × 6.022×10^23 atoms/mole
what is the first step when scaling a graph?
Answer: the lll newton law
Explanation:
it jus is
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
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.
A student measured the mass of some sodium chloride for a lab. the lab called for 6.25 g (the accurate measurement ) , but the student measured 6.00 g instead . what is the percent error for this mass ? Show your work .
Answer:
The answer is
[tex] \huge 4\%[/tex]
Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual mass = 6.25 g
error = 6.25 - 6 = 0.25
So we have
[tex]p(\%) = \frac{0.25}{6.25} \times 100[/tex]
We have the final answer as
4 %Hope this helps you
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
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
Which is heavier? A pound of cotton candy or a pound of marbles
A fluorescent light tube has an internal volume of 400 cm and an internal pressure of 200 kPa.
It is filled with 0.03 moles of an ideal gas.
What is the temperature of the gas inside the fluorescent light tube?
A 3.21 x 10 K
B 3.21 x 10?K
с 3.21 x 105K
D 3.21 x 10K
with explanation plz
Answer:
Temperature of gas is 3.21×10² K
Explanation:
Given data:
Volume of bulb = 400 cm³ (400/1000 = 0.4L)
Pressure of bulb = 200 KPa (200/101= 1.974 atm)
Number of moles of gas = 0.03 mol
Temperature of gas = ?
Solution:
Formula:
PV = nRT
R = general gas constant = 0.0821 atm.L/ mol.K
1.974 atm × 0.4 L= 0.03 mol × 0.0821 atm.L/ mol.K × T
0.7896 atm.L = 0.002463 atm.L/K × T
T = 0.7896 atm.L / 0.002463 atm.L/K
T = 321 K 0r 3.21×10² K
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
how would you describe the size of atoms and molecules in your own words ?
Answer:
tomic size is the distance from the nucleus to the valence shell where the valence electrons are located. Atomic size is difficult to measure because it has no definite boundary. The electrons surrounding the nucleus exist in an electron cloud.
Explanation:
Answer:
Atomic size is the distance from the nucleus to the valence shell where the valence electrons are located. The separation that occurs because electrons have the same charge. The number of protons in the nucleus. The core electrons in an atom interfere with the attraction of the nucleus for the outermost electrons. and Molecular size is a measure of the area a molecule occupies in three-dimensional space. The amount of space any mass takes up in three-dimensional space is known specifically as its volume.
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:
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