Answer:
An orbit is a fixed path on which electrons revolve around the nucleus.
An orbital is the probable area of finding the maximum density of electrons in an atom. ..
Which element is not an alkali metal?
Hello!
Answer:
Hydrogen
Explanation:
Hydrogen (H) has one electron in its outermost shell, but it is not classed as an alkali metal since it is not a metal but a gas at room temperature.
Answer:
hydrogen, lithium, sodium element are not alkali metal
A particular medication dosage is 45.0mg/kg of body weight. what is the mass in mg of the medication a child weighing 33.5lb
Answer:
Dosage of drugs is dependent on the body weight of a person. The route of administration also plays crucial role in determining the dosage of the drugs. The calculation of dosage of drugs based on the bodyweight is calculated by the multiplication of body weight and dosage.
Explanation:
The medication dosage is given as 45mg/kg. To calculate the mass of dosage a child will require of body weight 33.5lb will be:
[tex]\text{Dose} = \text{Body weight} \times \text{Dosage}[/tex]
Therefore, converting the pounds to kg, it will be:
[tex]33.5\;\text{lb} = 15.19\;\text{ kg} \;(1\;\text{lb} = 0.4\;\text{ kg})[/tex]
Thus, dose of medication required will be:
[tex]\text{Dose} = 15.19 \: \times \: 45[/tex]
[tex]\text { Dose} = 683.8\: \text { mg}[/tex]
why is water a compound but hydrogen an element
Compounds are made of more than one element hence water is made of 2 Hydrogen and one Oxygen, but nacent Hydrogen is single hence it is an element.
How many moles of Al2O3 are contained in 45.1 g of Al2O3?
Answer:
0.44mol
Explanation:
1mol/102g=xmol/45.1g
-> x=(45.1x1)/102
x=0.44mol
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
(1 point)
Rubidium has more protons and fewer electrons than calcium.
Rubidium has fewer protons and more electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has fewer protons and fewer electrons than calcium.
Answer:
Chemical elements are categorized in the Periodic Table based on the number of protons and electrons. The electrons are the sub-atomic particle, which revolves around the atomic nucleus and has a negative charge. The protons are the positive charged sub-atomic particles, which are present in the nucleus of the atom.
Explanation:
The chemical element is a pure particle, which is made up of atoms. The atoms in a neutral chemical element have the same number of electrons and protons. In the case given above, calcium has fewer protons and electrons than rubidium. Calcium has the atomic number 20, such that it belongs to group 2 and period 4. The number of electrons and protons in calcium (no net charge) is 20. Similarly, the rubidium belongs to group 1 and period 5. The element has the atomic number 37, such that the number of electrons and protons in rubidium is 37.
convert methanol to ethanol
ANSWER:
We can convert methanol into ethanol by an organic coupling reaction which is called Wurtz reaction. This is carried out with sodium metal in the presence of dry ether and forms higher alkanes.
HELPPP!!!
11) An international set of units which are used in Science and based on the Decimal System A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
12) Standard units that can actually be measured with an instrument or device
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
13) An older system of units, still used in USA for commerce and construction
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
14) Mistakes due to carelessness or lack of verification
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
15) units that must be calculated from measured values
A. Basic Units
B. Derived Units
C. Metric (SI) Units
D. English (Common) Units
E. Random Errors
Answer:
11. A
12. B
13. D
14. E
15. C
For two variables in a direct proportion, what is the result of doubling one variable?
Answer:
the other variable is also doubled
Explanation:
direct proportion, same thing has to happen to both variables
What is the mass number for Iron-58?
Answer:
58
Explanation:
mass number of iron 58 is 58
Which of the following is a physical change?
A. Water reacting with potassium
B. Alcohol evaporating
C. Water splitting into hydrogen and oxygen
D. Alcohol burning
Explanation:
Alcohol burning
hope this helps you
I will give brainliest if you show work and answer correctly
1. Calculate the slope of each line using the points given. Graph each of the lines and determine if each is a positive or negative relationship. If you use graph paper, please take a photo and upload to your document.
2. Which graph(s) can not be a true measure of density? Why?
a. (24cm3, 6.0g), (12cm3, 24g)
b. (5.0cm3, 6.0g), (13cm3, 15g)
c. (5.0cm3, 4.0g), (25cm3, 24g)
d. (24 cm 3 , 8.0 g), (12 cm 3 , 22 g)
Answer:
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:linear-equations-graphs/x2f8bb11595b61c86:slope/v/graph-from-point-slope. Answer 1
Explanation:
I only know the first one
Jenna thinks a banana ripens faster when placed in a paper bag. She uses careful observation and experimentation to test her hypothesis 
A. Science
B.Pseudoscience
What are the limitations of using chemical indicators in determining the pH of a given solution?
Answer:
1) chemical indicators won't work above it's pH range so therefore it probably won't change colour.
2) the solution should be clear and colourless to see colour change.
3) indicators tend to be of low accuracy so it's not 100% reliable.
Please help ASAP!!!!!!!
Answer:
Chemists develop safer and more effective fertilizers and pesticides .Chemists develop more productive and safer crops .Explanation:
Agriculture means food producingWhich choice below represents a negative impact that chemistry has on society?
development of cancer treatment drugs
development of Teflon, the nonstick material used in cookware
combustion of car engines producing pollutants in the air
the development of nuclear power plants used to produce electricity
Answer:
combustion of car engines producing pollutants in the air
The energy of the universe is zero and the mass of the earth is also zero. True or false and why. please I need help
Answer:
false
Explanation:
false
Identify which subatomic particles match each of these descriptions. One of the descriptions describes two particles. Make sure to include both particles it describes. Description Particle(s) have a relative charge of +1 have a relative charge of -1 have no charge located in the nucleus of an atom have a much lower mass than the other two types of particles Answer Bank protons electrons neutrons
Explanation:
protons have a relative charge of +1, they are located in the nucleus and the carry a positive charge
the electrons are negatively charged and have a charge of -1 . They are found orbiting on the shells .the electrons have a negligible mass of 1 / 1840
the neutrons have no charge they are located in the nucleus of an atom .
Which one is the strongest acid?
•Formic acid
•oleic acid
•Malnoic acid
•None
What is the reason for the emission of light after the gas in a discharge tube is excited?
A)
photo-electric emission
Eliminate
B)
spontaneous radioactive reaction
C)
energy jumps by electrons due to excitation
D)
high energy reaction of the gas inside the tube
Answer:
c
Explanation:
took test on usa testprep
When gas in a discharge tube is excited to higher energy level after some seconds they return to the ground level by releasing energy in the form of light. Thus energy jumps by electron due to excitation is correct option.
What is gas discharge tube?A gas discharge tube is an electronic devise containing inert gases that ionizes and conducts results in emission of light.
When a potential is applied between the electrodes in a gas discharge tube, and the pressure is reduced, the gas particles inside forms a plasma of ions.
The electrons released when excited to higher energy level by absorbing energy and returns to the initial state by emitting energy in the form of light, the discharge tube glows.
The color emitted by the discharge tube vary based on the gas in the tube. Each type of gaseous ions emit different colors.
Therefore, the light emission in gas discharge tube is due to energy hike during electron excitation and then relaxing by emitting the light energy. Thus, option c is correct.
To find more about gas-discharge tube, refer the link below:
https://brainly.com/question/5468708
#SPJ2
If you change the number of neutrons in an atom, you will also change its -
charge
element.
o
number
d
isotope.
What is the formula of the compound in which the atom combining ratios are:
carbon : hydrogen : chlorine = 2:5:1
Enter elements in the order given:
Please help me with this
Answer: Carbon, hydrogen oxygen
Explanation:C2H5OH
Answer for this one?
Cu2+ is the correct answer!
Anti coagulant usend in blood sampling
Answer:
Ethylenediaminetetraacetic acid (EDTA), heparin, and citrate are the most commonly used anticoagulants (39–41). pls mark me branilest
Can someone plz help me answer this question
Answer:
10 ml
Explanation:
The graduated cylinder contains 19 ml of water before the silver pellet is placed inside. Afterwards, the graduated cylinder measures 29 ml of water. Therefore the pellet displaced 10 ml of water. ( 29ml - 19ml = 10ml )
What is an atomic number
Answer:
the number of protons is called the atomic number
hope it helps you buddy
Answer: number of protons in an atom
Explanation:
An atom has 15 protons and 14 Neutrons. What is the atomic number of this atom?
Answer:
Silicon
Explanation:
Therefore the isotope with 14 protons and 15 neutrons is Silicon-29.
An atom has 15 protons and 14 Neutrons. The atomic number of this atom is 14 and the element is silicon.
What is the atomic number?The atomic number of an element is its total number of protons or the total number of electrons. The atomic number is written down the element. It can be calculated by knowing the numbers of protons and electrons.
The element here is silicon, whose number of protons, electrons, and neutrons are equal, which is 14. These are the charged particles that are present in the atoms of the element.
The number of band protons is equal to an element. The atomic number will be its number of protons. The isotope with 14 protons and 15 neutrons is Silicon-29.
Thus, the atomic number of the element is 14 if it has 15 protons and 14 Neutrons. The element is silicon.
To learn more about an atomic number, refer to the link:
https://brainly.com/question/8834373
#SPJ2
The radius of a silver atom is 145 pm. How many silver atoms would have to be laid side by side to span a distance of 2.31
mm?
atoms
M
Given that the radius of a silver atom is 145 pm, it would take [tex]7.97 \times 10^{6}[/tex] silver atoms laid side by side to span a distance of 2.31 mm.
The radius of a silver atom is 145 pm. Then, the diameter (twice the radius) is:
[tex]d = 2 \times 145 pm = 290 pm[/tex]
We will convert 290 pm to millimeters. We will use the conversion factors:
1 m = 10¹² pm1 m = 10³ mm[tex]290 pm \times \frac{1m}{10^{12}pm } \times \frac{10^{3}mm }{1m} = 2.90 \times 10^{-7} mm[/tex]
If the diameter of 1 silver atom is 2.90 × 10⁻⁷ mm, the number of silver atoms required to span a distance of 2.31 mm is:
[tex]2.31 mm \times \frac{1Ag\ atom}{2.90 \times 10^{-7}mm } = 7.97 \times 10^{6} Ag\ atom[/tex]
[tex]7.97 \times 10^{6}[/tex] silver atoms span a distance of 2.31 mm.
You can learn more about unit conversions here: brainly.com/question/19420601
Which type of model best represents crystals?(1 point)
ball-and-stick
ribbon
Lewis dot
space-fill
Which option describes the molecule geometry of a molecule with one bond and three lone pairs?(1 point)
angled
octahedral
tetrahedral
linear
Answer: angular
Explanation:
Angular and is found in hydrogen...from sighwell assumption saying that is they is three pairs of electrons in the valence shell of the central atom the orbital will oriente at an angle of 120° to form a bond of trigonal planar or angular.
Answer:
1) ball and stick is right just did this on my test.
2) linear
Explanation:
Why non quantitative observation are not useful?
Quantatative is when a number of something changes, and we could sometimes visualize it, but qualitative is different.
Hope this helps
kenny
:D
How many names make up binomial nomenclature?
A(3)
B(4)
C(1)
D(2)
