Answer: Its all of them
Explanation: I just took the test
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+
Which set of reagents will best convert 2,2-dimethylpropan-1-ol (neopentyl alcohol) to 4,4-dimethylpentan-2-ol
Answer:
SOCl2, Mg, CH3CHO, H3O^+
Explanation:
The reaction of the 2,2-dimethylpropan-1-ol with SOCl2 converts the alcohol to an alkyl halide. This now reacts with Mg metal to yield a Grignard reagent.
The Grignard reagent reacts with CH3CHO and acid to yield 4,4-dimethylpentan-2-ol as shown in the image attached to this answer.
According to the graph, which statement is correct?
Answer:
There is no graph
Explanation:
Which two types of organisms are found in the domain Eukarya?
A Protists
B. Archaea
O C. Animals
D. Bacteria
Answer:
A. Protists
C. Animals
Explanation:
Eukarya are protists, plants, animals, and fungi. Hope it helped!
The correct answers are A and C.
Eukarya are one of the three domains in which current biological science divides life. Eukarya are all organisms in which each cell contains a nucleus.
Eukarya, in addition to many unicellular species, include all types of multicellular organisms. Multicellular organisms are made up of different, specific cell types that make up different tissues.
The largest group of organisms within eukarya are the protists. These are all single-celled organisms with a eukaryotic cell structure. The protists show a great diversity of species and, except for having a cell nucleus, show little similarity or relationship with each other. In addition, all multicellular organisms such as plants, animals and fungi are eukaryotes.
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3. Why do you think the image of the pencil inside the beaker of water is different than the pencil
inside the empty beaker?
I’m going to give brainlest to who answers does tree questions
Answer:
the water.
Explanation:
well the water makes things look larger than due to ( the surface of a water drop curves outwards to make a dome. this outward or convex, curature light rays inward. the result is an enlarge ment image on the eye. / makes it look larger) + more mass.
What is the mass of 2.53x10^34 atoms of Ni?
Answer:
2.48 g
Explanation:
From the question given above, the following data were obtained:
Number of atoms = 2.53×10³⁴ atoms
Mass of Ni =?
From Avogadro's hypothesis,
we understood that 1 mole of any substance contains 6.02×10²³ atoms.
Therefore, 1 mole of Ni contains 6.02×10²³ atoms.
Recall:
1 mole Ni = 59 g
Therefore, 59 g of Ni contains 6.02×10²³ atoms.
Finally, we shall determine the mass of 2.53×10³⁴ atoms of Ni. This can be obtained as follow:
6.02×10²³ atoms = 59 g
Therefore,
2.53×10³⁴ = 2.53×10³⁴ × 59 / 6.02×10²³
2.53×10³⁴ atoms = 2.48 g
Thus, the mass of 2.53×10³⁴ atoms of Ni is 2.48 g.
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.
Determine the mass in grams of 5.49 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.)
Answer:
0.67 g
Explanation:
We know that 1 mole of an element is 6.02 x 10^(23) atoms
Now, arsenic has 5.49 × 10²¹ atoms
Thus;
Number of moles of arsenic = 5.49 × 10²¹ × 1/6.02 x 10^(23) = 9 × 10^(-3) moles
We are told that;
one mole of arsenic = 74.92 g.
Thus, 9 × 10^(-3) moles = 9 × 10^(-3) × 74.92/1 = 0.67428 g ≈ 0.67 g
0.446 g of hydrogen gas fills a 5.0 L bag determine the density of hydrogen
The density of hydrogen : ρ = 0.0892 g/L
Further explanationGiven
mass of Hydrogen : 0.446 g
Volume = 5 L
Required
The density
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³, kg/m³, or g/L
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
Input the value :
ρ = m : V
ρ = 0.446 g : 5 L
ρ = 0.0892 g/L
Many organisms on Earth exhibit similar ____________.
Question 1 options:
time
single-celled
characteristics
nonliving
Answer:
Characteristics
Explanation:
hope this helps
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
Which of the following chemical equations proves that the law of conservation of mass is in effect?
Question 2 options:
Mg2 + LiBr ---> LiMg + Br
2KCl + F2 ---> 2KF + Cl2
Na +O2 ---> Na2O
H20 ---> H2 + O2
Answer:
2KCl + F₂ → 2KF + Cl₂
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
2KCl + F₂ → 2KF + Cl₂
In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.
All other options are incorrect because mass is not conserved.
_______________ is a process by which organisms best fit for the environment are most likely tp survive and reproduce
Answer:
natural selection
Explanation:
natural selection
How many atoms of Na would be in 2.53 moles of Na
Answer:
15.24× 10²³ atoms
Explanation:
Given data:
Number of atoms of sodium = ?
Number of moles = 2.53 mol
Solution:
The given problem will solve by using Avogadro number.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.53 mol × 6.022 × 10²³ atoms / 1mol
15.24× 10²³ atoms
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
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:
An object has a density of 7.8 g/cm3 and a volume of 9 cm? What is the mass of the object?
Answer:
70.2 grams
Explanation:
The formula for density is p = m/V.
Here, p (density) and V (volume) are already given.
So, modify the formula to: m = pV.
p is 7.8 g/cm³, and V is 9 cm³.
m = 39/5 * 9/1
m = 351/5
m = 70.2 grams
The mass of the object is 70.2 grams.
Mg2+ and Br- formula
Answer:
MgBr₂
Explanation:
The given ions are:
Mg²⁺ and Br⁻
To find the formula of the compound that will result, we use the combining power or valency approach.
The combining power is the number of electrons usually lost or gained or shared by atoms of elements during the chemical combination.
Mg²⁺ and Br⁻
combining power 2 1
exchange of valencies 1 2
Molecular formula is given as MgBr₂
How does temperature affect pressure?
As temperature increases so does pressure.
Pressure is not affected by temperature.
Pressure will always increase if temperature increases or decreases.
As temperature increases, pressure decrease.
Answer:
fr
Explanation:
For all seawater problems, assume the salinity is 3.5%
If you have a 2000 gram sample of seawater, how many grams of pure water are there?
0.035 x 2000) = x, 2000 - x = pure water
Answer to the nearest WHOLE number.
Answer:
1930g
Explanation:
We have been given that the salinity of sea water is 3.5%;
Now the mass of sea water sample is 2000g
So, problem here is to find the quantity of pure water in the sample = ?
Solution:
Let us find the quantity of the salt in the sample;
Salt content = 3.5% x 2000 = 70g
Amount of pure water = 2000 - 70 = 1930g
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
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
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:
What is the name of the compound with formula P3O10?
Answer:
The compound of the formula is Sodium triphosphate.
Explanation:
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.(Please explain the answer. Thank you!)
A chemist needs 2.00 g of a liquid compound, which has a density of 0.718 g/mL. If the
compound costs $5.67 per mL, how much will a 2.00 gram sample cost?
Sample cost = $15.796
Further explanationGiven
Mass = 2 g
Density = 0.718 g/ml
Cost = $5.67 per mL
Required
Cost
Solution
The density : the ratio of mass and volume
Can be formulated :
Density (ρ) = m : V
The volume of the liquid :
V = m : ρ
V = 2 g : 0.718 g/ml
V = 2.786 ml
Sample cost :
= 2.786 ml x $5.67/ml
= $15.796
Tonic bonding is the result of electron transfer.
Lose electrons and become positive ions. While,
Gain electrons and become negative ions.
gain
Write your two answers with a comma between them like: dogs, cats.
Answer:
metals, non-metals
Explanation:
Ionic bonding results from electron transfer. To form this bond type, metals lose electrons and becomes positive ions. While non-metals gain electrons to become negatively charged.
Ionic bond forms between a very less electronegative substance and one with with a higher one. The two ions formed attracts one another with an electrostatic force. This electrostatic force is the ionic bonding that holds the atoms together.Of the following two gases,
which would you predict to
diffuse more rapidly?
СО
CO2
CO diffuses more rapidly as compared to CO₂.
What is Diffusion?Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. The process of diffusion happens more rapidly in gases and liquids as compared to solids because their particles can move randomly.
The gases spread in the entire space available to them and intermix together even against gravity.
The Graham's law of diffusion states that the rates of diffusion of the gases are inversely proportional to the square root of their molar masses under same temperature and pressure.
Therefore, CO diffuses more rapidly as compared to CO₂.
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How many electron shells/orbitals will be around the nucleus of an atom of aluminum?
A. 1
B. 2
C. 3
4. 4
The number of electrons is revealed by the atomic number. This indicates that an aluminum atom contains 13 electrons. Eight electrons make up shell 1, eight electrons make up shell 2, and three electrons make up shell 3. The correct option is C.
Each subsequent shell that surrounds the nucleus of an atom's electrons is placed farther away from the nucleus. Atomic orbitals make up one or more of the one or more subshells that make up an electron shell.
The first two electrons in aluminum fall into the 1s orbital, followed by the next two electrons into the 2s orbital. The following six electrons complete the second shell's 2p orbital. The 3s orbital is then filled by electrons 11 and 12. The 3p orbital is now occupied by the final electron.
Thus the correct option is C.
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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
Calculate the number of moles of iron that are contained in 2.89x10^ 25 atoms of iron