Answer:
B
Explanation:
Its atomic number is 28 and that is zinc
What gas in our atmosphere is thought to have come from plants and algae alone?
Answer:
Oxegen
Explanation:
All that oxygen has to come from somewhere. You might already know that it comes from photosynthetic organisms like plants.
6. How many grams of barium chloride are produced when 1.25 x 10power23 molecules of HCl reacts with barium according to the following equation?
word equation: HCl + barium --> barium chloride + hydrogen
formula equation: 2HCl + Ba --> BaCl2 + H2
given: 1.25×10^23 molecules HCl
Find: g BaCl2
given#moleculesSubA × 1molSubA/6.022×10^23 moleculeSubA × #molSubB/#molSubA × g SubB/1molSubB
The mass of barium chloride produced is 21.6 grams.
What is barium chloride?It is an inorganic compound with the chemical formula BaCl₂.
The equation: HCl + barium --> barium chloride + hydrogen
The chemical equation : 2HCl + Ba --> BaCl₂ + H₂
Given the 1.25×10²³ molecules HCl
First, we calculate the amount of HCL
Amount of moles of HCl=
(1.25×10²³ molecules × 1 mole)/ 6.023×10²³ atoms
=0.2075 moles.
Then the number of moles is multiplied by the molar mass of barium chloride
208.24 g/mol × 0.2075 = 21.6 grams.
Thus, the mass of barium chloride produced is 21.6 grams.
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Water is continuously changing state and moving from place to place in the water cycle. This diagram shows these processes and movements. (Bro there's no science AHHHH)
Answer: bro- i have no idea wat science that is but heres the water cycle-
balance CHCl3 + O2 = CO2 + H2O + Cl2
Answer:
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
Explanation:
Left Hand Side(LHS)
We have CHCl3 and O2
Right Hand Side(RHS)
We have CO2, H2O and Cl2
Balancing
To make sure that they have same values, put 2 before CHCl3 giving 2CHCl3 and 3 on Cl2(RHS) for chlorine gas giving 3Cl2
H2O remains the same
Before CO2 put 2 giving 2CO2
To make sure that oxygen is balanced put 5/2 before it. This gives 5/2 O2 (2 cancels out don't worry)
Combining all;
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
I hope this helps. Have a nice studies.
An atom that gains one extra electron forms an ___________with a 1- charge.
Explanation: When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion.
Why Leaves Change Color in the Fall
Answer:
Chlorophyll Breaks Down
Explanation:
But in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.
Answer GREEN CHLOPHYL GOES AWAY
Explanation:
THE RDS, YELLOW, BROWNS, AND PURPLES OF FALL LEAVES ARE TIN THE LEAVES ALL SPRING AND SUMMER. IN THE FALL, THE GREEN CHLOROPHYL WHCIH HAS COVERED THE OTHER COLORS, GOES AWAY AND WE SEE THE OTHER COLORS THAT WERE ALWAYS PRESENT
PLS HELP
1. Describe the structure of atoms, including the electrical charges, the location (in or out of nucleus) and atomic mass (1 amu or
less than 1 amu) of the following particles:
Answer:
atomic
Explanation:
dropping bombs im atomic, 0 2 0 1 bit
please help pick more then one answer!!!
Select all the correct answers.
How will the results of the Human Genome Project benefit the future of genetics? (Select all that apply.)
A. Scientists can develop better diagnostic methods for genetic diseases.
B. Scientists can successfully prevent the occurrence of genetic diseases in humans.
C. Scientists can prevent the process of human aging.
D. Scientists can compare the genomes of humans and other different organisms.
E. Scientists can produce organisms more superior than humans.
Answer: A. B.
Explanation:
An unknown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.
Rita measures the temperature of a pot of hot water and finds that it is 85.6
°C. What is this temperature in °F?
A. О 96.5 °F
B. O 212 °F
C. O 79.6 °F
D. O 186 °F
Some copper is palced in a previouly weighted crucible and reweighed .
Mass of crucible + copper = 5.92g
Mass of crucible = 4.65g
Clculate the mass of copper used in the experiment
We can find the mass of copper by finding the difference between the mass of the crucible and the copper, and just the crucible. This is possible since the mass that is left would be attributed to just the copper.
Mass of copper = (Mass of crucible + copper) - Mass of crucible
= 5.92 g - 4.65 g
= 1.27 g
.
Approximately now much energy will it take to
break all the bonds present in the molecule below?
Answer:
498 kj/mol
Explanation:
Chemical reactions occur as a result of bond breaking and bond formation.
The bonds in reactants are broken and atoms are rearranged to form new bonds.
During bond breaking energy is absorbed to break the bonds of reactants while bond formation involves the release of energy during the formation of new bonds.
In our case;
In 1 mole of the Oxygen molecule, there is one O=O bond
Energy absorbed to break O=O is 498 kJ/mol
Therefore, the ΔH required to break all the bonds in one mole of Oxygen(O₂) molecules is 498kJ/mol.
Note that, bond breaking is endothermic since energy is absorbed from the surroundings.
mark brainliest pls
Element with the largest electron cloud
Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.
kasama na po jan ang explenation
Which of the following is similar in size to an atom?
O A ball used in sports, such as a basketball
O A large building, similar to a shopping mall
O A particle you cannot see with your eyes
O A seed of a fruit from an apple or orange
Calculate the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy.
Q = mcΔT
The specific heat of water is 4.18 J/g°C.
Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 1800 J c= 4.18 [tex]\frac{J}{gC}[/tex] m= 5 g ΔT= ?Replacing in the expression to calculate heat exchanges:
1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT
Solving:
1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT
ΔT= 86.12 C
In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
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brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsChemical & Earth Science Name:______________________________________
Date: ________________________________
Nonmetals & Metalloids Worksheet
Write the letter of the correct answer on the line at the left.
1. _____ Which of the following is NOT a
property of most nonmetals?
A found on the right side of the
periodic table
B solids tend to be dull and brittle
C excellent electric conductivity
D many are gases at room temperature
3. _____ Two of the same atoms bonded
together is called a(n)
A isotope
B diatomic molecule
C binary atom
D semiconductor
2. _____ The only nonmetal in Group 14 is
A carbon
B oxygen
C nitrogen
D fluorine
4. _____ The highly reactive nonmetals of
Group 17 are called the
A noble gases
B metalloids
C halogens
D actinides
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
5. ___________________ Atoms of nonmetals usually lose electrons when they combine
with other atoms.
6. __________________ When two or more atoms bond by sharing electrons, they form
a molecule.
7. __________________ The elements that have some properties of metals and some
properties of nonmetals are called halogens.
8. __________________ Helium has chemical properties so different from those of the
other elements that it cannot be placed in any group.
9. __________________ Substances that can carry electric current under some
conditions but not under others are called semiconductors.
10. __________________ The Group 15 element oxygen is used to make compounds
known as fertilizers.
Answer:
whoa this question is long
Explanation:
how did u write it gosh
Don't really understand the question
Answer:
Did they mean those diagrams are the salt or what?
A piece of copper alloy with a mass of 85.0 g is heated from 30. °C to 45 °C. In the process, it absorbs 523 J of energy as heat. What is the specific heat of this copper alloy?
plz help me and answer this xx
Answer:
410.196 J/[kg*°C].
Explanation:
1) the equation of the energy is: E=c*m*(t₂-t₁), where E - energy (523 J), c - unknown specific heat of copper, m - mass of this copper [kg], t₂ - the final temperature, t₁ - initial temerature;
2) the specific heat of copper is:
[tex]c=\frac{E}{m*(t_2-t_1)}; \ => \ c=\frac{523}{0.085*(45-30)}=\frac{523}{1.275}=410.196[\frac{J}{kg*C}].[/tex]
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
Answer:
b
Explanation:
What can you say about the reactants of photosynthesis and the products of cellular respiration?
Answer:
The reactants of cellular respiration are oxygen and sugar, which are the products of photosynthesis
Explanation:
how long does it take to rehydrate after being dehydrated
Answer:
up to 120 minutes to digest water and rehydrate your body
Suppose that you experimentally determine the molar extinction coefficient (ε) of a complex ion sample to be 8171 L/mol-cm at 510 nm. The literature value for the ε of the complex ion sample is reported as 8400 L/mol-cm. What is the percent purity of your experimental sample
The percent purity of your experimental sample is 97.3 %
The percentage purity % = impure value/pure value × 100 %.
Actual value of molar extinction coefficient = impure value = 8171 L/mol-cm, pure value = literature value = 8400 L/mol-cm.
Substituting the values of the variables into the equation, we have
% purity = 8171 L/mol-cm/8400 L/mol-cm × 100 %
% purity = 0.9727 × 100 %
% purity = 97.27 %
% purity ≅ 97.3 %
The percent purity of your experimental sample is 97.3 %
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Is cobalt(II)oxide ionic or covalent
[tex]\small{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}}[/tex]
[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Ionic}}}}}}}}}}}}}[/tex]
The compound cobalt(II)oxide is an ionic compound.
An ionic compound is a composed composed of a metal and a nonmetal. Hence the compound is actually an ion pair. The ion charges in the compound must be balanced.The compound cobalt(II)oxide is composed of a metal (cobalt) and a nonmetal (oxygen) hence the compound cobalt(II)oxide is an ionic compound.Hence, the fact that cobalt II oxide is comprised of a cation and an anion means that it us an ionic compound.
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1) What is the time a projectile object is in flight (in the air) if it is launched at a velocity of 15
m/s at an angle of 37 degrees?
2) What is the range (horizontal distance traveled) of this object?
3) What is the time a projectile object is in flight (in the air) if it is launched at a velocity of 47
m/s at an angle of 15 degrees?
4) What is the range (horizontal distance traveled) of this object?
5) What is the time a projectile object is in flight (in the air) if it is launched at a velocity of 60
m/s at an angle of 55 degrees?
6) What is the range (horizontal distance traveled) of this object?
Answer:
So the degree angle will be horizontally
Explanation:
This table displays which one is it A. Price values of the metals ,B. Physical properties of the metals ,C. Chemical properties of the metals ,D. Corrosive resistance of the metals
Answer:
b the physical components
How might a molecule have a very strong molecular dipole?
Answer:
When you make the electronegativities of A(Positive partial charge) and C (Negative Partial charge) less and have B with a strong electronegativity to create a very strong molecular dipole. ... Both molecules possess strong molecular dipoles.
Two pendulums colliding are example of?
Answer:
it should be an Elastic collision
I need help with this question please
1-propanol is the correct answer.
water is formed when 48g of oxygen combine with 6g of hydrogen. what mass of oxygen combines with 2g of hydrogen
Answer:
16g of oxygen reacts with 2 g of hydrogen to form 18g of Water
Identify what the conjugate acid/base would be. FOR KOH?
Answer: As K+ is a very weak conjugate acid of KOH, hence it has no ability to react with either OH– ion or with water molecules ions.
Explanation: Name of Molecule Potassium hydroxide
Chemical formula KOH
pH value 12 to 13
Conjugate acid K+
