CAN SOMEONE PLEASE HELP ME ASAP PLEASEE ANYBODY LITERALLY ANYONE OUT THERE PLEASE
Which subatomic particle can be shared between separate atoms?
Answer:
Electrons
Explanation:
Atoms can combine together and share electrons between them. Atoms that share electrons are linked to each other in a form, called a molecule that is in a lower energy state than either of the separate atoms alone.
Pls Brainliest! It would mean a lot! ;)
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:
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:
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 ✌️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.
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.
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
can someone help me please
Answer:
What is we doing explain first before you say you need help with.
Explanation:
ok
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
Along with subduction, what other process changes sedimentary rocks to metamorphic rocks?
oxygenation
temperature
weathering
gravity
Answer:
B
Explanation:
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:
Answer question number 8?
Answer:
It is composed of two or more substances that retain their own chemical properties
Explanation:
Which is the smallest?
A) 1.3 x 1020
B) 2.9 x 1021
C) 9.5 x 1032
d) 8.4 x 1019
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
Hii if you could help that would be great, if the answer is correct ill mark as brainliest :)))
Answer: i would say the first one
Explanation:
I need help, plz and thank you.
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.
What happens to the atomic radius when an electron is lost?
A. The positive ionic radius is the same size as the neutral atomic
radius.
B. The positive ionic radius does not follow a trend with the neutral
radius.
C. The positive ionic radius is smaller than the neutral atomic radius.
D. The positive ionic radius is larger than the neutral atomic radius.
Answer:the positive ionic radius is smaller than the neutral atomic radius
Explanation:
Answer:The positive ionic radius is smaller than the neutral atomic radius.
Explanation: just took the test
1. A charged group of covalently bonded atoms is known as
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
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
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 .
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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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
Assume that the pendulum clock shown in the photograph is a closed
system
Which statement describes evidence that the pendulum's energy is conserved
even as it eventually stops moving?
A. Energy must be added to the pendulum to keep it from slowing
down
B. Some of the clock's matter is transformed into new energy
C. The amount of each type of energy in the system can be
measured
D. All its mechanical energy is transformed into other forms of
energy
Answer:
Explanation:
d
Answer:
D. All it’s mechanical energy is transformed into other forms of energy.
Explanation:
I got it right
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.
all the atoms in Neon do not have to have 10 protons. True, or false?
Answer:
true
Explanation:
Answer:
False.
Explanation:
The number of protons in an atom also places it on the periodic table- the 1st element on the periodic table is Hydrogen because it has 1 proton. If it had 2- it'd be Helium. Neon must have 10 protons to be #10 on the periodic table. (and to even be Neon)
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 =)
1. Compare and contrast the characteristics of metals and nonmetals.
2. Describe the electrochemical series and why it’s important in understanding metals.
3. Describe the theory of ionization in regard to acids and bases.
4. Identify the role of indicators.
Answer:
1. Both metals and nonmetals are types of elements and can be involved in chemical reactions. Some of their differences are highlighted in the chart below.
Metals:
Appearance; Shiny.
Conduct heat or electricity; Yes.
Malleable or ductile; Yes, both and has great mechanical strength.
Form stable compounds; Forms stable compounds with acids; also forms oxides; replaces hydrogen in acids or water; combine with nonmetals; often becomes positive.
Nonmetals :
Appearance; Not shiny .
Conduct heat or electricity; Not well .
Malleable or ductile; Brittle and not easily molded into shapes .
Form stable compounds; Oxides usually give acid reactions in water; often becomes negative
2. The electrochemical series is an arrangement of metals in such order that any metal in the list is displaced from its compounds by any metal above it, but displaces any metal below it. The higher up the list a metal is, the greater its activity. Knowing a metal’s placement on this chart can help you understand the activity of the metal, especially in regard to its ability to displace hydrogen in acids. Any items on the list far above hydrogen will do a good job at displacing it, those near it won’t do such a good job, and those below it won’t displace it from acids at all.
3. When placed in water, acids dissociate and form free hydrogen ions, which determine the properties of acids. The number of hydrogen ions determines the strength of an acid. Strong acids dissociate to a large degree and produce a large number of hydrogen ions. Weak acids dissociate to only a slight degree.
When placed in water, bases dissociate and form free hydroxyl ions, which determine the properties of bases. Strong bases dissociate to a great degree and produce a large number of hydroxyl ions. Weak bases dissociate to only a slight degree.
When free hydrogen ions and free hydroxyl ions are removed from solutions of acids and bases, then the acidic and basic properties disappear. This is what happens when acids and bases are mixed together in proper proportion; the hydroxyl ion will unite with the hydrogen ion to form water. The resulting salt product is neutral.
4. Indicators are used to help determine the pH value of an unknown solution. These are often papers that turn a certain color at certain pH values.
Metals are good conductors of heat and electricity but the non-metals are not.
Compare metals and non-metalsMetals are good conductors of electricity and heat whereas non-metals are poor conductors of heat and electricity. Metals have high density while on the other hand, non-metals have low density. Metals are malleable and ductile whereas non-metals are brittle.
So we can conclude that metals are good conductors of heat and electricity but the non-metals are not.
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What mineral is harder, Calcite or Olivine?
Answer:
olivine im pretty sure
Explanation:
calcite has a hardness number of 3 and calcite has a hardness number of 6.5-7
