Answer: 0.337 mol Ca
Explanation: 13.5 g Ca ÷ (40.1 g/mol Ca) =
Answer:
13.5/40+0.3375
Explanation:
imagine a basketball filled with liquid water. Would the basketball still hold the same number of molecules ? Can you use 22.4L/mol as the molar volume for liquid water?
Answer:
the ball will have more molocules
Explanation:
the ball has a heaveir mass
No, the basketball hold more number of molecules due to presence of water in it.
When the basket ball is filled with water so the empty spaces present between gas molecules also filled and increase occurs in the concentration of molecules.
We can't use 22.4L/mol as the molar volume for liquid water because it is a molar volume of ideal gas at STP and we know that liquid water is not a gas, it is a liquid so we can conclude that more molecules are present in the basket ball due to addition of liquid water.
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for a neutralization reaction, would you expect the magnitude of q to increase, decrease, or stay the same if the concentration of only the acid were doubled? why?
For a neutralization reaction, the value of q(heat of neutralization) is doubled when the concentration of only the acid is doubled.
A neutralization reaction is a reaction in which an acid reacts with a base to yield salt and water. Ionically, a neutralization reaction goes as follows; H^+(aq) + OH^-(aq) ------> H20(l).
The heat of neutralization (Q) of the system depends on the concentration of the solutions. Since Q is dependent on concentration, if the concentration of any of the reactants is doubled, more heat is evolved hence Q is doubled.
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Answer:
Stay the same
Explanation:
If only the concentration of acid were doubled no additional neutralization reaction would occur
WILL MARK AS BRAINLIEST IF CORRECT
3. Which graph indicates that one of the runners started 10 meters ahead of the other?
A
B
30
Distance from starting line (meters)
Distance from starting line (meters)
2
1
2
Time seconds)
The seconds
с
D
Distance from starting line (meters)
Distance from starting line (meten
GE
1
2
Time (seconds)
The seconds)
A graph A
O B. graph B
O C. graph
O D. graph D
Answer:
A
Explanation:
I think, I hope it is correct
Name the form of carbon used for absorbing poisonous gases and purification of noble gases
How to calculate the frequency of a wave?
Answer:
count each wave crest
Explanation:
hope this helps
An empty beaker weighs 31.89 g.
When completely filled with water, the beaker and its contents have a total mass of 305.55 g. What volume does the beaker hold?
Use d = 1.00 g/mL as the density of water.
Explanation:
difference of masses - (305.55-3189)g = 273.66g
density of water = 1g/mL.
therefore, volume = m/density (ρ)
= 273.66/1 = 273.66mL.
so, the beaker can hold 273.66mL.
hope this helps you.
Name an element that has the same number of electron energy levels as Calcium (Ca)?
Answer:
aluminum?
Explanation:
A ball rolls down a ramp. It goes through a
straight tunnel, and then curves to the left.
Based on this information, which statement is
true about the ball's motion?
A student needs to make 0.855 L of a sodium bromide solution for an experiment. The concentration of the required solution is 0.350 M. How many grams of sodium bromide will he need to use?
Answer:
Explanation:
Molarity = moles/liters of solution
moles = molarity x Liters of solution
= 0.350 m/L x 0.855 L
= 0.299 mol
mass = moles x molar mass
= 0.299 mol x 102.89 g/ms
= 30.78 grams
if you think about similarities between elements instead of differences, how can that make understanding matter a little bit easier?
Which marine ecosystem depends on upwelling from the seafloor to maintain its high productivity?
Answer:n some ways, upwelling can be a mixed blessing to coastal ecosystems. It can infuse coastal waters with critical nutrients that fuel dramatic productivity,
Explanation:
Coral reefs is the marine ecosystem which depends on upwelling from the seafloor to maintain its high productivity.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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#SPJ2
how many chromium (II) ions would bond with 2 phosphate ions?
Answer:
ummmm I don't know of sorry
The substances which are not found in the periodic table are called ?
Answer:
undiscovered elements (by their atomic number).
(I don't know if this is the correct answer)
Explanation:
The letters “J” and “Q” are the only two letters not found on the periodic table. These letters do not occur in either element symbols or element names.
Which condition must be met for conduction to occur?
A:particles must be large
B:articles must be small
C:particles must be in contact
D:particles must be spread apart
Answer:
D
Explanation:
when you boil water in a pot and put a lid or something meatal over it when it reaches a certain temperature it gets steamy and during that it will get hyper and run around in circles and will go up but since the meatal or glass lid is there it will stop it and you will see water droplets on the inside.
Answer:
d
Explanation:
Mendeleev placed thallium (Tl) in the same group as lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). However, the modern periodic table doesn’t place thallium in this group. Use the periodic table to find the properties of thallium. Explain why Mendeleev might have grouped thallium in the same group as lithium and sodium. Also explain how thallium is different from the other five elements.
Answer:
When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly
Explanation:
Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:
Since, all are metals so they need to be placed in the same group.The particular group is referred to (group one) is actually the most reactive metals on the periodic table. These are the elements that most easily loose their electron from their outer valence shell. Thus each element can easily give up their valence electron in a reaction to form a positive ion. These are the most easily reactive in this way.When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly.Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
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Hydrochloric acid has the
chemical formula HCI. Does this
information make you think that
hydrochloric acid is an element,
compound, or mixture
Answer:
its a mixture
Explanation:
I can't explain why
Which correctly explains the relationship between predators and prey?
when the number of prey increase the number of predators will increase
when the number of prey decrease, the number of predators will increase
when the number of prey increase, the number of predators will decrease
BRAINLIESTTT
Answer:
When the number of prey increase the number of predators will increase.
Explanation:
This is because the predators have more food available, which will make their population grow.
Elements and compounds at the beginning of a reaction are ____.
They are called the Reactants
A reactant? If i understood correctly.
WILL MARK AS BRAINLIEST IF CORRECT
1) How do valence electrons impact the type of bonds an atom makes?(1 point)
a. A large number of valence electrons means the atom will share electrons; a small number of valence electrons leads to transferring from one atom to another.
b. An atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
c. An atom wants an empty outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
d. A small number of valence electrons means the atom will share electrons; a large number of valence electrons leads to transferring from one atom to another.
2) Use your knowledge of valence electrons and how they affect bonds to figure out how carbon (Group 14) and oxygen (Group 16) would be attached to one another. In carbon dioxide (CO2), how is the compound structured? (Use “–” to represent a single bond and “=” to represent a double bond.)(1 point)
a. C–O–O
b. C=O–O
c. O=C–O
d. O=C=O
3: Methane’s chemical formula is CH4. Is there a bond between any of the hydrogen atoms? Why or why not?(1 point)
a. Yes, there is because they form a long chain in order to all have stable outer energy shells.
b. No, there is not because it would form H2 instead of methane if hydrogen bonded with itself.
c. No, there is not because carbon needs four bonds, so it bonds with each hydrogen atom; hydrogen only forms one bond.
d. Yes, there is because there are one too many hydrogen atoms for carbon to handle alone, so one hydrogen must bond with another.
4: In hydrogen peroxide (H2O2), which option best shows how the atoms are ordered?(1 point)
a. O–H–O–H
b. H–O–O–H
c. O–H–H–O
d. H–O–H–O
Answer:
1. How many electrons does hydrogen need in order to have a full shell of valence electrons?...two
2. How do valence electrons impact the type of bonds an atom makes?...An atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
3.Use your knowledge of valence electrons and how they affect bonds to figure out how carbon (Group 14) and oxygen (Group 16) would be attached to one another. In carbon dioxide (CO2), how is the compound structured? (Use “–” to represent a single bond and “=” to represent a double bond.)...O=C=O
4. Methane’s chemical formula is CH4. Is there a bond between any of the hydrogen atoms? Why or why not?...No, there is not because carbon needs four bonds, so it bonds with each hydrogen atom; hydrogen only forms one bond.
5. In hydrogen peroxide (H2O2), which option best shows how the atoms are ordered?...H-O-O-H
Explanation:
Valence electrons are found on the outermost shell of an atom and determines the kind of bonds the atom can form.
When an atom has a large number of valence electrons, it is energetically more favorable for the atom to share electrons rather than to transfer electrons to another atom. Atoms with less valence electrons transfer electrons from one atom to another.
Since carbon is a member of group 14 and oxygen is a member of group 16, it follows that carbon can share four electrons with two oxygen atoms as shown in the structure O=C=O.
Carbon is always tetravalent in all its compounds. This means that one carbon atom must form four bonds. It follows that the carbon atom in CH4 forms four bonds with the four hydrogen atoms hence there are no bonds between hydrogen atoms in CH4.
H2O2 contains the peroxide (O-O) bond. It follows that its correct structure must be H–O–O–H.
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100 points pls helpppppp?
Answer:
It’s the chemical change then a new substance is formed.
Explanation:
25 PT Which statement about exothermic reactions is true?
A.Electrons are transferred in an ionic bond.
B.Electrons are shared in an ionic bond.
C.Protons are transferred in an ionic bond.
D.Protons are shared in an ionic bond.
Answer: A
Explanation: electrons are transfers in iconic bonds they are completely transfers from one adam to another
HELP QUICK An unknown substance is a liquid and is red in color.
How can you determine if the unknown is a mixture or a pure substance?
Why can't molecules have thermal energy?
Answer:
Thermal Energy, also known as random or internal Kinetic Energy, due to the random motion of molecules in a system. Kinetic Energy is seen in three forms: vibrational, rotational, and translational. Vibrational is the energy caused by an object or molecule moving in a vibrating motion, rotational is the energy caused by rotating motion, and translational is the energy caused by the movement of one molecule to to another location.
Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?
Solid is the low energy state of condensed matter is characterized by structural rigidity
answer me
short answer
Explanation:
B. 1) Tritium is the isotope of Hydrogen (H).
2) Mass of an Electron is 9.10938356 × 10-³¹ Kg.
3) Molecular mass of Carbon dioxide (CO2)
=> Molecular mass of carbon = 12g
Molecular mass of oxygen= 16g
molecular mass of CO2 = [12 + (16 X 2)]g
= (12 + 32)g
= 44 g
4) Dalton has given its Atomic Theory in the year 1803.
5) Nucleus is discovered by
= Ernest Rutherford discovered the nucleus of the atom in 1911.
hope this helps you.
please help! will give brainliest!!! match each of the terms on the right with the letters on the right.
Explain how ions are accelerated, detected and have their abundance determined in a time of flight (TOF) mass spectrometer
Your own words
Answer:
mass spectrometers separate ions by time without the use of a magnetic field. All ions are accelerated by an electric field
Is oxygen likely to gain or lose electrons when boding? EXPLAIN.
Answer:
yes covalent bonding is the scientific term for this. This is simply four elements in groups 15 16 and 17 to receive electrons than to lose them oxygen atoms, for example, acquired two electrons to create see you two ions. The electron configuration is similar to that of the noble gas Neon.
(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3).
(explain/or do density(calculate it) find volume first. then show work of density divided by volume give proper units.) (Density is a physical property of a molecule that’s measured as mass per unit volume.) (Measurement in chemistry. Think about the density of different substances. PLEASE SHOW WORK)
Answer:
0.690g/cm^3
Explanation:
•Mass: 2.331g
•Volume: 3.375 cm^3
One side is 1.5cm.
1.5^3
3.375cm^3
•Density: Mass/Volume
Mass = 2.331g
Volume = 3.375cm^3
2.331g/3.375cm^3
0.690g/cm^3
Density: 0.690g/cm^3