Answer:
C. would be the correct option.
Explanation:
Burning gasoline is a chemical change because when gasoline is ignited, water and carbon dioxide are produced. Water freezing to form ice would be a physical change since its state of matter has changed, but not the water itself. Sugar dissolving in water is also a physical change because all it's really doing is just forming bubbles and changing the color. Choice D. would also be a physical change since the piece of metal is still a piece of metal, it just expanded when the temperature increased.
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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How can you use probability to predict the outcome of a codominant cross?
in the 0 in 0.23 significant
Answer:
No, The Significant Figures are 2 3
Explanation:
What is the mass of 18.5 moles of iron?
Answer:
1 mole =56 g
18.5 moles =56×18.5
=1036 moles Hope this helps you Stay happy and safe Do mark as brainliest ✌️In Bohr’s model of the atom, where are the electrons and protons located?
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
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:
I need help, plz and thank you.
What can you conclude from the fact that scientists continue to update the atomic model?
A
New information about atoms continues to be discovered
B
Old information about atoms is completely useless
С
Scientists did not have any information about atoms until a few years ago
D
Scientists still have no idea what atoms look like
Answer:
A
Explanation:
B,C,D is incorrect about atomic model
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:)
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)
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
Which is the smallest?
A) 1.3 x 1020
B) 2.9 x 1021
C) 9.5 x 1032
d) 8.4 x 1019
Which pieces of equipment would be used to measure the density of a solution?
a. a ruler and a protractor
b. a magnet and a thermometer
c. a graduated cylinder, ruler, and a balance
d. an Erlenmeyer flask and a Bunsen burner
Answer:
c I've taken chem 3 times
Explanation:
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.
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:
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.
an object sitting on the floor can have potential energy true or false
Answer:
True
Explanation
Any object that's still, has potential energy
Answer:
True
Explanation:
it just depends on an object's weight and its height above the ground
1. A charged group of covalently bonded atoms is known as
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
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
____ 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 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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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
Protons have about the same mass as:
A. plasma particles
B. neutrons
C. electrons
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.
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:
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What is the independent variable?
Answer:
Wing length
Explanation:
According to the given excerpt, independent variable is 'wing length' and dependent variable is 'amount of time it takes for helicopter to hit the floor'.
Independent variable refers to the variable that do not undergo any change or shift in the course of the experiment of research. The other variables are measured using the constant independent variable. The value obtained from the independent variable is independent. On the other and, the dependent variable witnesses change with respect to the independent variable.
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.
Why can two water molecules stick to each other?
