Answer:
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
Explanation:
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
Explanation:
The atomic number is number on the right side
Which of the following would be a warning sign that information about a weight loss medication is not reliable science?
Answer: The correct answer is B.
Explanation: The scientists and all test subjects involved in the investigation work for the company that sells the medication and science product or similar is only considered as reliable if it has been tested following the scientific method and if there are not interests that can affect the process.
What element is [Xe]6s24f5d6
Answer:
Holmium
Explanation:
Electronic configuration:
[Xe] 6s² 4f⁵ 5d⁶
To know this element, we must first find the atomic number and then look for its position on the periodic table.
Number of electrons in [Xe] = 54;
So the total number of electrons = 54 + 2 + 5 + 6 = 67
This element has an atomic number of 57. On the periodic table, it is Holmium
X-ray crystallography is used to see the structure of molecules. Scientists have used this technique to find the structure of cholesterol, an important biological molecule.
Knowledge of the structure of cholesterol is helpful because it may affect
A. how cholesterol works in the body.
B. the amount of cholesterol that is considered healthy.
C. previous ideas about which foods contain cholesterol.
D. previous explanations of how cholesterol works in the body.
Answer:
A. how cholesterol works in the body.
Explanation:
If we know the precise structure of a molecule (by X-ray crystallography), we can understand more about how it interacts with cells, proteins, and other molecules. It can also tell us what reactions it might take part in.
Therefore, we can learn more about how it works in the body and what activities it takes part in in the cells of the body.
Answer:
A
Explanation:
nuityyy
A conclusion in science states whether or not a hypothesis is correct
or not?
Answer:it do not states
Explanation:
Which science is the study of living organisms? physics astronomy chemistry biology
Answer:
biology
Explanation:
biology is the study of living g things
Answer:
The answer you would be looking for is Biology
What is the mass of protons neutrons and electrons PLZ HURRY
Answer:
Mass of proton neutron and electron
Protons, neutrons, and electrons: Both protons and neutrons have a mass of 1 amu and are found in the nucleus. However, protons have a charge of +1, and neutrons are uncharged. Electrons have a mass of approximately 0 amu, orbit the nucleus, and have a charge of -1.
Explanation:
Hope this helps :)
If the number of equally likely sample outcomes of a single ASAP! stage of an experiment is 4, what is the total number of elements in the sample
space if the experiment has 3 stages?
OA. 16
OB. 12
OC. 64
OD. 81
Answer:
C. 64
Explanation:
Given:
The number of equally likely sample outcomes of a single stage = 4
Unknown:
Total number of elements if there are three stages= ?
Solution;
Probability is the likelihood of an event to occur.
In this problem;
For a single stage, the likely outcome is 4
So therefore;
For the 3 stages 4 x 4 x 4 = 64
Therefore, the total number of elements in the sample space of an experiment with 3 stages is 64
1. An oxide of chromium is found to have the following % composition: 68.4% Cr
and 31.6% 0. Determine this compound's empirical formula.
Answer:
Empirical formula is Cr₂O₃.
Explanation:
Given data:
Percentage of Cr = 68.4%
Percentage of O = 31.6%
Empirical formula = ?
Solution:
Number of gram atoms of Cr = 68.4 / 52 = 1.3 2
Number of gram atoms of O = 31.6 / 16 = 1.98
Atomic ratio:
Cr : O
1.32/1.32 : 1.98/1.32
1 : 1.5
Cr : O = 1 : 1.5
Cr : O = 2(1 : 1.5)
Empirical formula is Cr₂O₃.
HELPPPP . what is this
I'll be honest I'm guessing,
but maybe D
2.54 mL of ethanol to mol ethanol (Hint: the density of ethanol is 0.789
g/mL.)
0.04350179862
Explanation:
Make sure to check for sig figs though. Basically, you have 2.54 mL and you multiply that by the 0.789 g/mL and mL cancels out and you are left with 2.00406g. There are 46.06844 grams per mol of ethanol, so to cancel out grams we multiply by 1/46.06844. And then we are left with 0.04350179862 mol
7. A scientist is trying to determine the identity of an element. It is highly reactive in water
and forms an ionic bond with chlorine. It is also very shiny. The element is likely
(1 point)
from Group 17.
from Group 1.
from Group 15.
a noble gas.
Will IO- and NaOH form a buffer?
Answer:
this is the answer for will NaOH be a buffer
Explanation:
The compound CH 3NH 3Cl is a salt made from that weak base, so the combination of these two solutes would make a buffer solution. NH 3 is a weak base, but NaOH is a strong base. The combination of these two solutes would not make a buffer solution
The basis of the VSEPR model of molecular bonding is __________. Question 1 options: atomic orbitals of the bonding atoms must overlap for a bond to form regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions regions of electron density on an atom will organize themselves so as to maximize s-character Question 2 (1 point)
Answer:
Electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions
Explanation:
In accordance with VSEPR theory, the electron domains or electron pairs on the valence shell of the central atom in a molecule always position themselves as far apart in space as possible in order to minimize repulsions.
Recall that according to VSEPR theory, the shape of a molecule depends on the number of electron pairs or electron domains on the valence shell of the central atom of the molecule, both lone pairs and bond pairs. Lone pairs are known to cause more repulsions than bond pairs.
the male and female sex cells combine to form a
Answer:
zygote
Explanation:
In human beings, each gamete contains 23 chromosomes, half the number found in the other cells of the body. When the male and female gametes fuse, they become a zygote containing the full 46 chromosomes, half of which came from the father and half from the mother.
Answer:
zygote
Explanation:
In human beings, each gamete contains 23 chromosomes, half the number found in the other cells of the body. When the male and female gametes fuse, they become a zygote containing the full 46 chromosomes, half of which came from the father and half from the mother.
An unknown compound containing tellurium and bromine is analyzed
and it is determined that 28.53% of the compound by mass is
composed of tellurium.
How many moles of Te are present in 100.00 g of the compound?
Answer:
The correct answer is 0.22 mol Te.
Explanation:
First, we have to calculate the mass of Te in the sample. We simply multiply the sample mass by the percentage of Te (28.53%= 28.53/100)
100.00 g x 28.53/100 = 28.53 g Te
The molar mass of Te is 127.60 g. Thus, the mass of 1 mol of Te is 127.60 g. With this, we calculate how many moles of Te there are in 28.53 g of Te:
28.53 g Te x 1 mol Te/127.60 g Te= 0.223 mol ≅ 0.22 mol
True or False: A chemical reaction ALWAYS results in a ne product being formed
Answer:
True
Explanation:
A chemical reaction will always result in a new product or substance being formed
that is what makes it a chemical reaction.
what isotope has a mass number of 18 and an atomic number of 7
Answer:
nitrogen 18
nitrogen has an atomic number of 7
which of the following is NOT a characteristic of minerals
A. Occur in gaseous and liquid state
B. Formed by inorganic processes
C. naturally occurring
D. definite chemical composition
Answer:
A. Occur in gaseous and liquid state
Explanation:
The choice that is not a characteristic of minerals is that minerals occur in gaseous and liquid state.
All minerals are solid inorganic compounds.
A mineral is an inorganic compound that is formed naturally. They have a definite and specific chemical composition. Minerals are the building blocks of rocks. When minerals aggregates together, they form different rock types. There is no known mineral that is in fluid state. All minerals are solids. Examples are quartz, kaolinite, gypsum e.t.cIn the modern Periodic Table of the Elements, in order of what property are the elements arranged?
atomic number?
date of discovery?
number of neutrons?
Reactivity with hydrogen?
Answer:
They are organized by atomic number, hence the reason for 1,2,3,4, you get where im goin'?
Explanation:
HELPPPPPPPPP
50. How many joules of heat must be absorbed by 0.375 kg of water to raise its temperature by 45.0 to 70.0°C. Specific heat of water is 4.184 J/gC or 1.0 cal/gC
51. What mass of water can be heated from 25.0 to 50.0°C by the adding of 2825 Joules?(Cp of H2O=4.184 J/g °C)
Answer:
50. 54,915 J
51. 27.0 g
Explanation:
The dimensional analysis tells you how to compute these. Multiplying specific heat, J/(g·°C), by the product of mass and temperature change will give you energy.
__
50. (375 g)((70 -45) °C)(4.184 J/(g·°C)) = 54,915 J
__
51. M((50 -25)°C)(4.184 J/(g·°C)) = 2825 J
M = 2825/104.6 g ≈ 27.0 g
15. List the substances A-E in order from most dense to least dense based on the facts provided.
Please write the letters in the spaces provided below.
Substance A: 8.2 g/cm3
Substance B: 3.5 cm and 30.0g
Substance C: 10.0g and 40mL
Substance D: 0.5 g/cm3
Substance E: 2.0cm by 3.0cm by 1.0cm and 4.0g
Most Dense_ _ _ _ _
Least Dense
Answer:
So 1st it is B then D then E then a then C
The order of density of substances ranging from most dense to least dense is :substance B>substance A>substance E>substance C>substance D.
What is density?It is a ratio of substance's mass per unit of volume.Symbol most commonly used for density is р.The SI unit of density is kilogram per cubic meter .It explains how tightly a material is packed together.
There are 2 types of density :1)absolute density 2) relative density.Absolute density is the mass of any substance per unit volume and relative density is the ratio of density of a substance to the density of a given reference material.
Reference material used for relative density is water.The instrument used for measuring density or relative density of liquids is hydrometer. Density is measured at constant temperature and pressure.
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You have three mugs of tea:
a. Is a small mug. It is 100°F
b. Is a large mug. It is 120°F
c. Is a small mug. It is 120°F
Put these mugs in order. Start with the mug with the SMALLEST amount of thermal energy first and end with the mug with the LARGEST amount of thermal energy.
__2__ C. is a small mug. It is 120°F
__3__ A. is a small mug. It is 100°F
__1__ B. is a large mug. It is 120°F
Answer:
ACB
Explanation:
Thermal energy is the average sum of all kinetic energy of all the molecules of gases. The correct order of mug in decreasing thermal energy is C>A>B.
What is Thermal energy?
Thermal energy is a energy which is possess by a moving object. It is directly proportional to kinetic energy of the molecules. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. Average kinetic energy is directly proportional to temperature. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=2/3KT
Where,
K= Boltzmann constant
T is the temperature
Between A and C whose volume is same, 120°F is the highest temperature so, C will have high thermal energy than A. C will have lowest thermal energy as it has volume larger than that of A and C.
Therefore, the correct order of mug in decreasing thermal energy is C>A>B.
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Aspirin is not as____
in water as sugar is.
Answer:Soluble
Explanation:Soluble:(of a substance) able to be dissolved, especially in water.
what feature has disneyland's management added to lengthen the visitor's stay
Answer:
where are the options?
Explanation:
SOMEONE ANSWER NOW
Which statement best explains why light can travel with or without a medium?
A medium is necessary for light waves to travel.
Light waves cannot travel in a vacuum.
Light waves are longitudinal waves that do not require a medium to travel.
Transverse waves do not require a medium to travel.
Explanation:
its light waves cannot travel through vaccum
hope it helps
Answer:
Transverse waves do not require a medium to travel.
Explanation:
14)
A Kelvin temperature equivalent to 25°C is:
A)
-248K
B)
25K
C)
248K
D)
298K
Answer:
25°C + 273.15 = 298.15K , so D.) is the Answer
Explanation:
At STP, a 50.-gram sample of H2O() and a100.-gram sample of H2O() have
Answer:
2
Explanation:
because it same volume
The element with 6 valence electrons and 3 energy level is
Answer:
sulfur
Explanation:
moves.
whats the meaning
Speed ?
and the
meaning of
of Motion?
Hurry I have 15 minutes please help
Answer:
Speed: The rate at which someone or something is able to move or operate. Motion: The action or process of moving or being moved.
Explanation:
I pretty much explained it in the answer, have a good one!
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Organic whole wheat flour sells in bags weighing 2.915 kilograms.
How much flour is this when rounded to the nearest tenth? Use a place value chart and number line to explain your thinking.
Answer:
2.920
Explanation:
This question tests your knowledge of approximation. If we look at the place values after the decimal point, we have, .915. This corresponds to hundredth, tenth and unit.
Since we have 9.15, in rounding it to the nearest tenth, we have to round it up to .920.
Hence, the weight of the flour to the nearest tenth is 2.920.