Answer:
A variable in an experiment which is held constant in order to assess the relationship between multiple variables, is a control variable.
Explanation:
11. How many moles are in 7.14 X 10 35
molecules of 02?
Answer:
The answer is 1.186 × 10¹² molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 7.14 × 10^35 molecules of O2
We have
[tex]n = \frac{7.14 \times {10}^{35} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
1.186 × 10¹² molesHope this helps you
____ 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
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.
Answer question number 8?
Answer:
It is composed of two or more substances that retain their own chemical properties
Explanation:
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.
To learn more about the colloid, follow the link;
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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
Which of the following is a chemical change?
A. Water freezing to form ice
B. Sugar dissolves in water
C. Gasoline burns in a car engine
D. A piece of metal expands when it is heated
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.
Water trapped inside the cracks of rocks may freeze during the winter. As a result of this,____________________.
A) earthquakes are likely to occur
B) rocks are likely to break apart
C) diamonds are likely to form
D) volcanic rocks are likely to form
[tex] \LARGE{ \underline{ \orange{ \sf{Required \: answer:}}}}[/tex]
The water trapped inside the cracks of the rocks will freeze during the winter season. They will contract and will form ice which will apply pressure on the rocks. This will cause them to break apart and turn into smaller pieces. Hence the correct option is:
[tex] \large{ \boxed{ \bf{Option \: B}}}[/tex]
The above phenomenon is responsible for the physical weathering of rocks to form soil.
can someone help me please
Answer:
What is we doing explain first before you say you need help with.
Explanation:
ok
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)
example of physical property
Answer:
Color. I thinkkk.
Phyiscal properties are defined as properties that can be measured or observed without changing the chemical nature of the substance.
Some examples of phsyical properties are:
- Color
- Density
- Volume
- Mass
- Boiling or Melting Points
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:
What is the original source of most energy used on Earth?
Answer:
the sun Solar energy
Explanation:
Energy from the sun. Solar energy is the original source of most energy on Earth. There are many ways we use energy from the Sun.
Answer:
the sun Solar energy
Explanation:
Energy from the sun. Solar energy is the original source of most energy on Earth. There are many ways we use energy from the Sun. btw hope this helps u out =)
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 ✌️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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A liquid has a volume of 225 mL and a mass of 150 g. What is its density? Round your answer to 2 decimal places.
Answer:
The answer is 0.67 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{150}{225} = \frac{2}{3} \\ = 0.66666666...[/tex]
We have the final answer as
0.67 g/mL to two decimal placesHope this helps you
Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.
What most likely happened?
a non-chemical change, because there are no indicators of chemical changes taking place
a chemical change, because the mixture changed color
a chemical change, because a gas was produced
a non-chemical change, because the changes that occurred are reversible
Answer:the answer is a chemical change, because a gas was produced
Explanation: yeast is a chemical
Answer:
The answer is C.
"Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions."
Explanation:
Along with subduction, what other process changes sedimentary rocks to metamorphic rocks?
oxygenation
temperature
weathering
gravity
Answer:
B
Explanation:
In Bohr’s model of the atom, where are the electrons and protons located?
Which is the smallest?
A) 1.3 x 1020
B) 2.9 x 1021
C) 9.5 x 1032
d) 8.4 x 1019
If an object is accelerating the forces acting on the object are ?
Answer:
If an object is accelerating the forces acting on the object are BALANCED.
Explanation
if an object is moving at a constant rate of acceleration, the the forces acting upon it are balanced .
1. A charged group of covalently bonded atoms is known as
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
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:
Which of the following statements is correct?
2. Both compounds and mixtures can be separated by physical means.
b. Compounds can be separated by physical means, but mixtures cannot.
c. Mixtures can be separated by physical means, but compounds cannot.
d. Neither compounds nor mixtures can be separated by physical means.
Answer:
c. Mixtures can be separated by physical means, but compounds cannot.
Explanation:
Mixtures are comprised of two or more pure substances that have not combined to make a new substance. Because all pure substances have their own unique properties, mixtures can be separated by physical means.
Compounds are pure substances which means they have their own properties. Compounds are formed through a chemical means, and therefore must be separated through a chemical means.
Answer:
C
Explanation:
In compounds: Their individual constituent do not retain their properties hence cannot be separated by physical means
In mixtures: Their individual constituent retain their properties hence can be separated by physical means
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.
Why is the state of matter a physical
property of matter?
Beacuse a liquid is a physical property of matter so is gas solid and plazma what im getting it is they are propertys beacuse that helps the mind process them better.
How can you use probability to predict the outcome of a codominant cross?
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
I need help, plz and thank you.
