Answer:
Explanation:
Na2CO3(ag) +2k(s) →K2CO3 (aq) + 2Na(s)
A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.
Answer:
Mass of Ca in sample, Mass of Br in sample, Number of moles of Ca in sample, Number of moles of Br in sample, Mass or moles of element other than Ca or Br in sample
Explanation:
The AP Classroom will not count your answer to this question as correct unless it includes at least one of the answers listed above. If you say that theanswer to this question is density, it will be marked as incorrect, I found that out the hard way when I used the answers that brainly gave me.
Good luck,
I applaud you for using the sources avalible to you, which is /definetly not/ cheeting.
If density usually increases with decreasing temperature, why does ice float on liquid water? Explain.
Answer:
If you continue to cool water past 4 degrees Celsius, its density starts to plummet (you can see this in the graph). At zero degrees, i.e., the temperature at which water turns into ice, the density of water is actually quite low. It turns out that ice has a lower density than water, and any object that has a lower density than the liquid form on which it’s kept (in this case, water) will be able to float!
Explanation:
The ice floats in water because the hydrogen bonds in the ice change to negative, and Ice is, therefore, less dense than water because the density of water actually reduces as the temperature drops.
What are ice and water?Ice is the form of water. It is the frozen form of water. It is made up of hydrogen and oxygen.
The hydrogen bonds in water change as it cools, holding the negatively charged oxygen atoms apart and preventing the ice from getting much denser.
Water loses density after 4 degrees Celsius of cooling, therefore don't do it The water's density is actually relatively low at zero degrees, the temperature upon which water transforms into ice.
Thus, as it turns out, ice has a lower density than water, therefore any object will be able to float if its density is lower than that of the liquid state it is kept in.
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Who first arranged the elements according to atomic mass ?
Answer:
Dmitri Mendeleev
Explanation:
In 1869, just five years after John Newlands put forward his Law of Octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.
What is the name of the ionic compound LigPO,?
lanthanum phosphide
lanthanum phosphide
lithium phosphate
lanthanum phosphate
lithium phosphate hope this helps
110) Lake Michigan holds 1.3 x 10's gallons of water. If just Chicago removed water from the lake and it
never rained again, how many days would the water last? Chicago uses 1.2 x 109 gallons of water /day
gallons/day
You omitted what it was raised to the power in 1.3 x 10's gallons of water, so i will put it up as 1.3 x 10^15 gallons of water and solve with it
Answer:1,083,333 days
Explanation:
Total amount of water held by lake Michigan= 1.3 x 10^15 gallons of water
Amount of water Chicago uses per day =Chicago uses 1.2 x 10^9 gallons of water /day
Therefore,
Number of days water would last if it doesnt rain = Total gallons provided by lake Michigan/ Total gallons consumed per day
=1.3 x 10^15 gallons of water/ 1.2 x 10^9 gallons of water /day
= 1,083,333 days
Is 4H2O an organic molecule ?
Answer:
it is an organic molecule
Explanation:
it's a compound called chromium, phosphate tetrahydrate, where tetra stands for 4 , as there are four water molecules attached to the compound.
Noble gases share which characteristics? Check all that apply A.) they all have one free electron in their outer shell B.) they’re considered transition elements C.) they don’t react with other elements D.) they’re inert
what are the two main categories of matter
Answer:
pure substances and mixtures
Explanation:
Answer:
Matter can be broken down into two categories. pure substances and mixtures. i hope this helps.
Explanation:
Hurry please
The atomic number is the number of protons in the atom of the element.
A)True
B)False
Answer:true
Explanation:
definition of atomic number
Write the noble gas configuration for nickel
Answer:
[Ar] 3d⁸ 4s²
Explanation:
Atomic number: 28
Symbol: Ni
Atomic mass: 58.6934 u
Forming a hypothesis is accomplished through___ reasoning
Solve the following problem and round the correct number of significant
figures?
4.5 x 2.34 = ?
Answer:
4.5 + 2.34 = 6.8
Sig Figs:
2
Decimals:
1
Scientific Notation:
6.8 × 10ⁿ
Words:
six point eight
7. A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is its density?
Answer:
[tex]d=1.6\ g/cm^3[/tex]
Explanation:
Given that,
The dimension of a square chunk of plastic is 5 cm × 5 cm × 5 cm
Mass, m = 200 g
We need to find its density
Density = mass/volume
It will form a cube. It volume = side³
So,
[tex]d=\dfrac{200\ g}{5^3\ cm^3}\\\\d=1.6\ g/cm^3[/tex]
Hence density is [tex]1.6\ g/cm^3[/tex]
How might newtons second law relate to an asteriood that is heading toward earth
Answer:
it might be able to get a heading to a earth
1. A sample of oxygen (0.) gas has a mass of 32.65 g and a volume of 24.924 L. What is the density of the 0,gas?
Answer:
The answer is
1.31 g/LExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of oxygen gas = 32.65 g
volume = 24.924 L
The density of the gas is
[tex]density = \frac{32.65}{24.924} \\ = 1.3099823463...[/tex]
We have the final answer as
1.31 g/LHope this helps you
A student wants to find out if drinking coffee will affect the amount of sleep she has everyday. She collected data of cups of coffee that she drank to how much hours of sleep she got everyday. What would you plot on the y-axis?
Hours of sleep
Independent variable
Manipulated variable
Cups of coffee drank
Answer:
hours of sleep
Explanation:
because she is trying to collect data to see how much she would sleep.keywords how much hours of sleep she got everyday answer what they are asking you the answer is simply
You plot hours of sleep on the Y-axis while the cups of coffee drink on the X-axis. Thus, the correct option for this question is A.
What is the significance of plotting graphs?The significance of plotting graphs is to represent a relationship between different sets of variables with respect to one another. The purpose of a graph is to present data that is too complicated to be described in the text.
According to the context of this question, a student wants to determine the effect of drinking coffee on the hours of sleep. So, she is required to take the hours of sleep on the Y-axis.
Therefore, you plot hours of sleep on the Y-axis while the cups of coffee drink are on the X-axis. Thus, the correct option for this question is A.
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Baking powder is example of???
What will most likely occur if sulfur forms an ionic bond with another element? (Click on the icon for the periodic table to view sulfur)
Sulfur will accept electrons.
Sulfur will donate electrons.
Sulfur will become a positive ion.
Sulfur will become less stable.
Answer:
The answer is Sulfur will accept electrons
Explanation:
Because it will most likely occur if sulfur forms an ionic bond with the elements
If sulfur forms an ionic bond with another element then the sulfur will accept electrons. Hence option A is correct.
What is ionic bond?Due to their electrostatic attraction, oppositely charged species interact via ionic bonding, a form of chemical connection.
One atom transfers electrons to another when a positively charged ion forms a connection with a negatively charged ion.
Example: NA+ and Cl- gives NaCl
Sulfur belongs to group 6A of non-metals. Its valence electrons number six. It follows the octet rule. It must acquire two electrons. Thus, it creates two single covalent connections (ionic bonds).
When sulfur receives two electrons, it is ionized itself, so it from an ion with a 2-charge.
Sulfur will accept electrons will mostly likely occur if sulfur forms an ionic bond with another element. Hence option A is correct.
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Which best describes a chain reaction associated with a nuclear reaction?!!
Answer: The statement that describes a chain reaction brought about by a nuclear reaction is "neutrons released during a fission reaction cause other nuclei to split." This is applicable to fission reactions only wherein atoms split and produce neutrons that also cause further atoms to split, thus creating a chain or series of reactions.
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PLEASE ANSWER NOW!!! This chart shows what happens when each object is placed on a balance with a 10 kg weight on the other side. Which statement is best supported by the information in the chart? Object 1 is the heaviest object. Object 3 is heavier than Object 1. The weight is heavier than Object 2. The weight is the heaviest object.
Answer:
Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. ... Forces that cause a change in the motion of an object are unbalanced forces. Unbalanced forces are not equal and opposite.
Explanation:
Any push or pull is a force. To describe a force, you must know two things. You must know the size of the force and the direction of the force. Suppose two teams are playing tug of war. Each team is pulling with equal force, but in opposite directions. Neither team can make the other team move. Forces that are equal in size but opposite in direction are called balanced forces.
tug of war balanced
Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but opposite force. Neither you nor the wall will move. Forces that cause a change in the motion of an object are unbalanced forces.
tug of war unbalanced 1
Unbalanced forces are not equal and opposite. Suppose that one of the teams in tug of war pulls harder than the other team. The forces would no longer be equal. One team would be able to pull the other team in the direction of the larger force.
Force and Motion
More than one force can act on an object at the same time. If you hold a paper clip near a magnet, you, the magnet and gravity all exert forces on the paper clip. The combination of all the forces acting on an object is the net force. When more than one force is acting on an object, the net force determines the motion of the object. In this example, the paper clip is not moving, so the net force is zero.
How do forces combine to form the net force? If the forces are in the same direction, they add together to form the net force. Suppose you and a friend are asked to move a piano for the music teacher. To do this, you pull on one end of the piano, and your friend pushes on the other end. Together, your forces add up to enough force to move the piano. This is because your forces are in the same direction. Because the forces are in the same direction, they can be added together to determine the net force. In this case, the net force is 45 N, which is plenty to move a piano - if it is on wheels, that is!
net force piano
If two forces are in opposite directions, then the net force is the difference between the two forces, and it is in the direction of the larger force. Consider two dogs playing tug of war with a short piece of rope. Each is exerting a force, but in opposite directions.
Notice below that the dog on the left is pulling with a force of 10 N, and the dog on the right is pulling with a force of 12 N. Which dog do you think will win the tug of war? Because the forces are in opposite directions, the net force is determined by subtracting the smaller force from the larger one. In this case, the net force is 2 N in the direction of the dog on the right. Give that dog a dog biscuit!
Answer:
A. Object 1 is the heaviest
Hope it works!
Explanation:
what provides the energy needed to fuel the water cycle
Answer:
Sunlight provides the energy
HELP ME PLZ
B
A
o
What is represented by letter B?
Answer:
Barium oxide, BaO, baria, is a white hygroscopic non-flammable compound
Explanation:
so the answer is BARIUM
what is the molecular geometry of SCN- using the electron pair repulsion model?
Which decimal is equivalent to 56?
Answer:
The answer is 0.56
Explanation:
your welcome.
Answer:
The answer is 0.56
Explanation:
i think so
Can someone help with this one I’m desperate
Answer:
C
Explanation:
im not that sure if its correct
Is cobalt 60 more dangerous than bananas ( potassium 40) and why ?
Answer:
To the best of my knowledge, it is because of the amount of gamma rays is given off.
Explanation:
While both are isotopes, Potassium 40 gives off fewer gamma rays compared to Cobalt 60. Potassium 40 isn't really harmful to humans, but Cobalt 60 (I believe) is used in chemotherapy.
Been struggling with this question for a while, some help will be appreciated :)
Which of the following happens during a chemical reaction?
Atoms of reactants are destroyed.
New atoms are created to form the products.
Atoms of reactants rearrange to form new substances.
The total mass of the reactants is less than the total mass of the products.
Answer:
Atoms of reactants rearrange to form new substances
Explanation:
During a chemical reaction, atoms of reactants rearrange to form new substances.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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PLZ ANSWER WILL GIVE BRAINEST Based on the information in the table, which elements are most likely in the same periods of the periodic table?
-Boron and carbon are likely together in one period because they have very close atomic numbers, while gallium and germanium are likely together in another period because they have very close atomic numbers.
-Aluminum, boron, and carbon are likely together in one period because they were first isolated in the first half of the 1800s, while gallium and germanium are likely together in another period because they were first isolated in the second half.
-Boron and carbon are likely together in one period because they each end in “-on,” while aluminum, gallium, and germanium are likely together in another period because they each end in “-ium.”
-Aluminum, boron, and gallium are likely together in one group because they have the same number of valence electrons, and carbon and germanium are likely together in another group because they have the same number of valence electrons.
Answer:
Aluminum, boron, and gallium are likely together in one group because they have the same number of valence electrons, and carbon and germanium are likely together in another group because they have the same number of valence electrons.
Explanation:
Answer: The correct answer is
Aluminum, boron, and gallium are likely together in one group because they have the same number of valence electrons, and carbon and germanium are likely together in another group because they have the same number of valence electrons.
This is the only one that makes sense after reviewing the data. Hopefully this helps! Feel free to mark as brainliest!
I need help please, will give 5 stars