Which atorn was used to determine the amount of particles in a mole?
Answer:
carbon atom is used to determine the amt of particles in a mole
Which of the following is the metallic ion in sodium fluoride? 1. Na 1- 2. Na1 + 3. F 2- 4. F 2+
Answer:
2. Na1 +
Explanation:
The formular for sodium fluoride is; NaF
The metal in sodium flouride is sodium.
Sodium belongs to group 1, hence would lose one electron when forming ions.
This is represented as;
Na+
The strongest spring tide occurs when?
Answer:
the sun and moon are aligned with the earth.
Answer:
uhhh first or third quarter
Explanation:
Please help me thanks so much....I’ll mark you?!?!:)))) ( 15 points)
Answer:
all of the above
Explanation:
Which of the following is an expression of Boyle's law?
A. PT= constant
B. P/T=constant
C. V/T=constant
D. PV=constant
The expression of Boyle's law is to be considered as the PV=constant.
Hence, the option d is correct.
What is Boyle's law?
In physics, the volume of the gas at a similar kind of temperature should changed oppositely along with the pressure that should be exterted on it.
Also, the expression be like
P1V1 = P2V2
hence, The expression of Boyle's law is to be considered as the PV=constant.
Hence, the option d is correct.
learn more about law here: https://brainly.com/question/14696622
An empty Erlenmeyer flask weights 241.3 g. When filled with water (d = 1.00 g cmଷ ⁄ ), the flask and its contents weight 489.1 g. What is the flask’s volume? What is the mass of the flask when filled with chloroform (d = 1.48 g cmଷ ⁄ )?
Answer:
608 g
Explanation:
Mass of flask + contents = 489.1 g
Mass of flask = 241.3 g.
Mass of water = 489.1 - 241.3 = 247.8 g
Density of water = 1.0 g/cm^3
volume of water = 247.8 g/1.0 g/cm^3
Volume = 247.8 cm^3
But
Volume of flask = volume of water
Volume of flask = 247.8 cm^3
volume of chloroform = volume of flask
mass of chloroform = 1.48 g/cm^3× 247.8 cm^3
Mass of flask + chloroform = 366.7 g + 241.3 = 608 g
Nitrogen-13 has a half-life of about 10 minutes. How much of a 320g sample of N-13 would remain after 40 minutes?
Answer:
The half-life of a radioisotope describes the amount of time it takes for said isotope to decay to one-half the original amount present in the sample.
Nitrogen-13, because it has a half-life of ten minutes, will experience two half-lives over the course of the twenty minute period. This means that 25% of the isotope will remain after this.
0.25 x 128mg = 32mg
32mg of Nitrogen-13 will remain after 20 minutes.
Which of the following is not a natural change to the envlronment? drought , flood, disease ranching
Answer:
Disease ranching
Explanation:
Floods and Droughts are caused by the enviorment. Diseases are but a product and don't affect the enviorment.
Answer:
disease ranching is not a natural change to the environment .
Explanation:
This all happen because of human activities
please fast!!!!!!!!!!!!!!!!!!!!!!
Answer:
1 g/mL.
Explanation:
From the question given above, the following data were obtained:
Volume = 100 mL
Mass = 100 g
Density =?
Density of a substance is simply defined as the mass of the substance per unit volume of the substance. The density can be expressed mathematically as:
Density (D) = mass (m) / volume (V)
D = m / V
With the above formula, we can obtain the density of the liquid as follow:
Volume (V) = 100 mL
Mass (m) = 100 g
Density (D) =?
D = m / V
D = 100 / 100
D = 1 g/mL
Thus, the density of the liquid is 1 g/mL
how does the structure of each passage help determine the content of the passage?
a. Passage I contains a character study, but Passage 2 focuses more on concepts.
b. Passage 2 contains significant cultural information, but Passage 1 illustrates history.
c. Passage 1 explains a scientific phenomenon,
but Passage 2 is purely fictional.
d. Passage 2 describes ongoing action, but
Passage 1 focuses more on feelings.
The answer to the question is a. Passage I contains a character study, but Passage 2 focuses more on concepts.
for all who were wondering
which of the following pairs of elements is most likely to form an ionic bond
a( phosphorus and bromine
b(calcium and bromine
c( carbon and chlorine
d(silicon and oxygen
Answer:
it is calcium and bromine
Explanation:
this is because they are both ionic compounds
What is conclusive evidence that mixing sugar in water is a physical change
Explanation:
1) their is no formation of new substance
2) the reaction can be reverse i.e if we heat sugar solution it we give us sugar and water.
How many molecules are in 38.4 moles of NF3?
Answer:3
Explanation:
I added and substituted for the garlic
26. A pathogen is any organism that causes a disease. Which of the following is an example of a pathogen that
infects humans?
A.parasite
B.plasmid
C.plant cell
D.plasma membrane
Answer:
A.parasite
Explanation:
I’ve missed this question twice now. Please help
Answer:
then it only gotta be 2 other options .
Explanation:
PLEASE HELP! Due in 1 minute chemistry lewis structure.
Am i correct?
Why is the time series useful as a management tool?
A) It estimates the probability of extinction.
B) It estimates the harvested numbers.
C) lt monitors a population's age structure.
D) It designates wildlife refuge areas.
Answer:
A)
Explanation:
It estimates the probability of extinction.
Many organisms on Earth exhibit similar ____________.
Question 1 options:
time
single-celled
characteristics
nonliving
Answer:
Characteristics
Explanation:
hope this helps
Inspiration for new types of synthetic materials often comes from observations of…
Answer and Explanation:
Inspiration for new types of synthetic materials come from natural materials where a derivative is needed to be used in situations where properties of a natural material are adjusted. Inspirations for new types of synthetic materials can also come from current synthetic materials that create toxins, and new ones are created with the same properties but with less harmful downsides.
The half-life of sodium-24 is 15 days. A laboratory technician measures out a 72 g sample. Approximately how many grams of sodium-24 would remain after 45 days?
Answer:
after 45 days 9 g left
Explanation:
Given data:
Half life Na-24 = 15 days
Mass of sample = 72 g
Mass remain after 45 days = ?
Solution:
Number of half lives passed:
Number of half lives = time elapsed / half life
Number of half lives = 45 days / 15 days
Number of half lives = 3
At time zero total amount = 72 g
After first half life = 72 g/ 2= 36 g
At 2nd half life = 36 g/2 = 18 g
At 3rd half life = 18 g/2 = 9 g
Thus after 45 days 9 g left.
The chemical formula for methanol is: Calculate the molar mass of methanol. Round your answer to decimal places.
Answer:
CH3OH (Methanol)MM = 12 + 8 + 16 = 36u
Decide which element probably forms a compound with hydrogen that has a chemical formula most and least similar to the chemical formula of the compound formed by hydrogen and oxygen.
The question is incomplete, the complete question is shown in the image attached to this answer
Answer:
Most similar - sulphur
least similar- gallium
Explanation:
The compound formed when hydrogen reacts with oxygen is water. The chemical formula of water is H2O.
Water is very similar to H2S which is the compound formed when hydrogen reacts with sulphur. The bonds in water and H2S are both polar covalent bonds.
However, gallium is a metal and its hydride (GaH3) is least similar to water.
How do you draw a branched carbon chain for trimethylbutane?
Answer:
I think this is how you draw it, but I'm not entirely sure.
Explanation:
Screenshot below:
I need help as fast as possible
Over long periods of time, a series of processes continuously change rocks from one type into another. This is called the rock cycle. A combination of subsurface and surface processes are responsible for the recycling of rocks in the geosphere.(that was the story)
What two processes are responsible for changing metamorphic and igneous rock into sedimentary rock?(this is the question)
A) intrusive and extrusive
B) weathering and erosion
C) subduction and sea floor spreading
D) heat and pressure
Answer:
B) weathering and erosion
Explanation:
The two processes responsible for changing metamorphic and igneous rocks into sedimentary rocks is weathering and erosion.
Weathering is the defined as the physical disintegration and chemical decomposition of rocks to form sediments and soils.
Erosion is the removal of weathered materials from the surface of the earth.
The process of erosion and weathering serves to convert igneous and metamorphic rocks into sediments by which a sedimentary rock is formed.
Answer: The rock cycle
Explanation: Well its kinda obious that it is the rock cycle because the question says it changes countinuously to other rocks so yeah rock cycle is answer to question.
why are cell wall chloroplast and vacuole found in plant cell only while centriole is for animal cell only?
Answer:
The cell wall and chloroplasts are essential for autotrophic processes, basically allowing plant life to thrive off of self-made nutrients/food. This is why they are only in plant cells.
Centriole:Anatomically, animal cells have them and plant cells don't have them. Centrioles direct the movement of chromosomes during cell division, but plant cells don't need this since they use photosynthesis.
Explanation:
how many grams og gas must be relased from a 45.2 L sample of N2 at STP to reduce the volume to 45.0 L at stop
Answer:54,6
Explanation:
Answer:
yes it is 54,6
Explanation:
54,6 you ar correct you did a graet job
This image of a baby was produced using ultrasound.
Which option is the best model of how the image was made?
O An X-Ray
O An echo
O A convex lens
O A turbine
Answer:
im pretty sure its "An echo"
Explanation:
Answer: An echo
Explanation:
it's very much correct
Which of the following is true of ionic bonds?
Moving electrons become delocalized between the atoms creating the
ionic bond
Electrostatic attraction results in the arrangement of charged atoms in a
regular, geometric structure called a crystal lattice.
Transferring of valence electrons creates the bond
The bond is created by oppositely charged metal and nonmetal atoms
Sharing Valence electrons between nonmetal atoms creates the bond
Answer:
D: The bond is created by oppositely charged metal and nonmetal atoms.
Explanation:
An ionic metal basically involves a metal and a nonmetal in bonding. A metal is a cation with a + charge and a nonmetal is a anion with a - charge. I will give you an example. Magnesium Chloride is a ionic bond. This is because Magnesium is a metal with a +2 charge(so it is a cation). Chloride or Chlorine is a nonmetal because it has a -1 charge.(so it is a anion). The chemical formula for magnesium chloride is MgCl2.
Hope my answer helped! Have a great day.
8. Water behind a dam, a moving car, and electricity moving in a circuit all are examples of
energy because they
a. Help accomplish a job
b. Can cause change
C. Are expensive to create
d. Come from fossil fuels
Answer:
a. Help accomplish a job
Explanation:
Energy is defined as the ability to do work. It is the ability to get a job done.
Where energy is deficient, no job or work can be done.
In a water behind a dam, potential energy is stored. Potential energy is due to the position of a body. A moving car has kinetic energy which the energy due the motion of a body. Electrical energy is used to carry the currents in a circuit round about.