PLEASE HELP ASAP
Please help!!
Answer:
Unwashed hands: This sample swab will have the most bacteria growth, as the bacteria has not been cleaned or Removed at all from this person‘s hands.
Regular Soap: Soap is meant to remove bacteria, not kill it. So by swabbing her hands after washing with regular soap , this technique will not be very effective. This also depends on if the soap is antibacterial or not. By wiping your hand, it may just move the bacteria.
Re-Swabbing: this will have almost the same exact effect as the first experiment. There may be a minute difference between unwashed hands and re-wiping unwashed hands.
Hand sanitizer: hand sanitizer is meant to kill bacteria, not move it, so this should have the least bacteria/virus beings on this swab. Alcohol based hand sanitizer is the most effective, and should kill 99.99 percent of germs. However, you have to wait atleast a minute before swabbing to let hand sanitizer work.
Explanation: I looked it up! :) hopefully this is helpful, please let me know! Have a great day:)
Which two types of information are found in an element's box in the periodic
table?
A. Atomic number
B. Chemical symbol
O C. Chemical formula
O D. Atomic structure
( TWO ANSWERS)
The information we can obtain for an element from periodic table is its atomic number and chemical symbol. Thus option A and B are correct.
What is atomic number?Atomic number of an element is the number of protons of the element. For a neutral atom the number of electrons is equal to the number of protons.
There are 118 elements in the modern periodic table and they are classified into different group and periods. Elements of same number of valence electrons and similar physical and chemical properties are classified into one group.
There are 18 groups and 7 period in the periodic table. Each classification is based on their atomic number. Chemical symbols are used to represent the elements and they can be easily identified by the symbols.
For example, hydrogen have the chemical symbol H and oxygen with O and carbon with C. etc. Similarly we can get mass number of elements from periodic table. Thus option A and B are correct.
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Select the correct answer.
In which situation is no work considered to be done by a force?
A.
when the angle between the force and displacement is 180°
B.
when the angle between the force and displacement is 90°
C.
when the angle between the force and displacement is 45°
D.
when the angle between the force and displacement is 0°
Answer:
Explanation:
when the angle between the force and displacement is 0
hey guys plz plz plz help me I am struggling I am in middle and struggling to answer this plz help
I have never learned how to calculate the specific heat there is a photo if u know plz answer we have a lot of people trying to figure out how to solve this and know one knows so plz if u know give it your best shot.
thank u I will most definitely appreciate it
and if u answer this correctly I will give 50 point and mark brainliest
of u are just trying to get point u rill be reported
so thanks guys.
Answer:
I've already answered this one for you. Anyway, please let me know if you have any more questions or need help!
What is the Lewis dot structure for
PF5
Answer:
40 valence electrons
four covalent bonds and one ionic bond.
Explanation:
see attached
If the compound's molecular formula is known, electron dot structures or Lewis dot formulas can be drawn. It describes the type of bond and the placement of the atoms within the molecule that are joined together. The Lewis dot structure for PF₅ is mentioned below.
Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule.
Each dot in a Lewis dot structure corresponds to 1 electron. A bond is denoted by two dots placed between the atoms in chemical symbols.
The Lewis structure is:
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Why do you elements in the same group have similar properties
Answer:
They have similar properties, because they share similar amounts of electrons in their outer shell, valence electrons! This means they will only be able to interact with other elements with those electrons so they often show similar properties.
Explanation:
____ energy is the energy a roller coaster stores while moving to the top of a hill.
A. G-Force
B.Potential
C. Stirred
D. Kinetic
Answer:
B
Explanation:
trust me im 100% correct
Which of the following could NOT be the chemical formula of an element?
A . T
B .TB
C) Tb
D. t
Answer:
b
Explanation:
I hoped this helped u have a great day
Answer:
the awnser is D
Explanation:
because all elements have to be capitalized
Why can two water molecules stick to each other?
A metal sample weighs 56.8 grams. How many ounces does this sample
weigh? (1 lb = 16 oz)
Answer:
2 oz. just multiply 56.8 with 0.03527
Explanation:
in the 0 in 0.23 significant
Answer:
No, The Significant Figures are 2 3
Explanation:
Sabrina was asked by a classmate why she would place hydrogen in the first column of the periodic table. Which of the following reasons could she give as a response? I. Hydrogen combines with chlorine in the same atomic ratio as sodium. II. Hydrogen is a gas at room temperature. III. Hydrogen forms diatomic molecules.
Answer:
the third option I think
Explanation:
Answer:
3 and 2
Explanation:
i had that question
This chart lists four kinds of polymers and their sources.
A 2-column table titled polymer examples. The first column labeled name of polymer has entries D N A, cellulose, nylon, hair. The second column titled source of polymer has entries inside of cells, plant material, synthetic material, animal material.
What can be known about all four polymers, despite their differences?
They come from living things.
They share ionic carbon bonds.
They are at least 100 monomers long.
They are made of repeating subunits.
Answer:
D. They are made of repeating subunits.
Explanation:
The first column represting polymers such as DNA, cellulose, nylon, hair are labelled with cells, plant material, synthetic material, animal material and They are made of repeating subunits.
Not all the entries in the first column come from living things as nylon comes from synthetic material (man-made). But all four (DNA, cellulose, nylon, hair) are conists of repeating unit.
DNA made up of nucleotides, cellulose is made up of rpeating units of monomer glucose, nylone is made of repeating unit of two monomers hexamethylene diamine and adipic acid, and hair is made of repeating unit of protein called keratin.
Hence, the correct answer is "D. They are made of repeating subunits."
Answer:
They are made of repeating subunits....(D)
Explanation:
hope this helps. also the person above me is correct
Xander claims that since the model of the atom has been changed so many times, that means it is a weak model. Willow claims that the more a model has been examined and adjusted, the stronger it is. Who is correct and why?
Answer:
Willow is correct because as things age and mature more, usually the more better they are.
Explanation:
To elaborate, you can perceive the development of the modern day atomic model as one aging and maturing. There's usually a correlation between age/maturity and knowledge, the same is true for the atomic model and other scientific theories.
A metal block, 2.0cm x 2.5cm x 3.0cm, has a mass of 40.5g. What is the density of the sample? What type of metal is the metal block composed of?
Aluminum - 2.699
Copper - 8.92
Iron - 7.874
Lead - 11.43
Nickel - 8.908
Tin - 7.265
Zinc - 7.14
Answer:
The block is made up of aluminum.
density = 2.7 g/cm³
Explanation:
Given data:
Dimension of metal block = 2.0 cm×2.5 cm× 3.0 cm
Mass of block = 40.05 g
Density of block = ?
Which metal is this = ?
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Volume of block = 2.0 cm×2.5 cm× 3.0 cm = 15 cm³
d = m/v
d = 40.5 g/ 15 cm³
d = 2.7 g/cm³
The block is made up of aluminum.
Jose had an assignment to classify mixtures he found around his home. As he started exploring the house, he recalled that mixtures are defined by the size and behavior of the particles in them. He found some buckets of paint in the garage. What kind of mixture can paint be classified as?
Answer:
colloid
Explanation:
Jose found some buckets of paint in the garage. The mixture can paint be classified as colloid, Therefore, option A is correct.
What do you mean by colloid ?The term colloid is defined as any substance made up of particles substantially larger than atoms or ordinary molecules but too small to be visible to the unaided eye.
A colloid is a homogenous of two phases these are the dispersed phase and the dispersion medium. The dispersed medium is analogous to the solute of the real solution while the dispersion phase is analogous to the solvent.
Their particles pass through temporary filter b. Their particles do not pass through permeable membranes. The particles of colloids are larger than those found in a solution. Their particles do not settle on standing.
Thus, option A is correct.
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Your question is incomplete, most probably your question was
Jose had an assignment to classify mixtures he found around his home. As he started exploring the house, he recalled that mixtures are defined by the size and behavior of the particles in them. He found some buckets of paint in the garage. What kind of mixture can paint be classified as?
a colloid
b solution
c solvent
d suspension
How can you use probability to predict the outcome of a codominant cross?
Can you explain what vsepr stand for in your own word?
The fire wood sends heat out in all directions. Warmed smoke filed air goes up the chimney. The outside of the metal fireplace gets very hot. The air that is heated above the fireplace gets pushed up by cool air. The room is filled with light from the fire. Is this convection, conduction, or radiation
Answer:
Convection
Explanation:
Convection is a mode of heat transfer that involves the actual movement of particles. In this case the particles are air particles.
Since hot air is less dense, it is pushed up by the denser cool air. This process may continue indefinitely and a convection current is set up.
Answer quick please.
5 Which of the charts below is most likely to represent a saturated solution?
A Chart A
B. Chart B
C. Chart C
D. Chart D
Answer:
c chart c
Explanation:
saturated solution: A solution with solute that dissolves until it is unable to dissolve anymore, leaving the undissolved substances at the bottom.
The chart which represents the graph for the saturated solution is chart C, because in that graph extra solutes are present at the bottom.
What is saturated solution?Saturated solutions are those solutions in which all solutes will dissolve in the solvent and addition of extra solute will not dissolve in the solution, but gets settle down at the bottom of the solution.
Chart A, B and D shows the graph for the unsaturated soution because all solute particles are completely dissolve in the solution and no extra solutes are present in that.Chart C shows the graph for the saturated solution as extra solutes are settle down at the bottom.Hence chart C shows the saturated solution.
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A scientist wants to prove that certain chemicals in cosmetics are likely to cause harm to developing fetuses, when used by a pregnant woman. What is the most likely limitation she will face in her scientific design? PLEASE HURRY!!
Answer:
D. Limitations due to ethical concerns about experimental subjects.
Explanation:
Answer:
A
Explanation:
(its my friend)
Ms. Cleary investigates the relationship between air pressure and weather. On Monday, she observes that the air pressure is low, and it is stormy outside. Which of the following explains why Ms. Cleary should continue collecting the same type of data for one month?
A. It will increase the reliability of the results.
B. It will decrease the accuracy of the results.
C. It will control the variables in her investigation.
D. It will change the hypothesis of her investigation.
1. A charged group of covalently bonded atoms is known as
Parts of mixture
a / can not be separated
b/ have new properties after they are mixed
C/ form achemicl combination of two or more atoms
Answer:
B- Have new properties after they are mixed
I hope this helps
truth is everyone is going to hurt you
you just gotta find the one worth suffering for. I love this so much
Answer:
facts
Explanation:
Answer:
yes i understand
Explanation:
1. True or False? The scientific method is defined as a method of research
in which a problem is identified, data is gathered, and a hypothesis is
created based off the data, then the hypothesis is tested.
Answer:
true
Explanation:
please mark BRAINLIEST
I need help, plz and thank you.
Protons have about the same mass as:
A. plasma particles
B. neutrons
C. electrons
HELP PLEASEE
Name three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts
Answer:
Let's start with the fact that cereals , are made of grains and are mostly carbohydrates. therefore they contain carbon oxygen and hydrogen. They also contain proteins so have nitrogen. Plants have the minerals that are in the soil where they grow, so the list you have is correct. They also generally have added vitamins ad minerals. The vitamins contain C, H, O N, and a few others such as sulfur, The added minerals might contain:copper, iron, zinc, cobalt, selenium, silicon and molybdenum .
Mark me as brainliest if it was helpful
The three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts are Iron, Calcium, and Zinc
Cereals are monocotyledonous grass crops cultivated annually for the purpose of consumption. They are rich in fiber and energy. Examples of them include;
maize, barley, wheat, oat, rye, etc.Cereal drinks are processed drinks extracted from cereal crops through fermentation. They are rich in nutrients as they contain important sources of carbohydrates, dietary protein, and vitamins.
The ingredients present in a cereal drink are composed of essential elements such as:
copper, cobalt, iron, zinc, molybdenum, iodine, chromium, and selenium.Some of which are not listed in the nutrition facts are Iron, Calcium, and Zinc.
Therefore, we can conclude that the elements present in the ingredients of the cereal drink which are not listed in the nutrition facts can be Iron, Calcium, and Zinc.
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In Bohr’s model of the atom, where are the electrons and protons located?
