Answer:
b:
Jacque could check if the rock layer has fossils in it.
Explanation:
!!!!!! that's what 4 of my teachers said
There are only 90 naturally occurring elements on Earth but there are millions of different substances explain how this is possible and describe how it applies to at least three examples
Answer:
See explanation
Explanation:
While it is true that there are only about 90 naturally occurring elements, these elements are capable of combining with each other to form millions of substances.
Most of the substances that we see around us today result from a combination of one or more of these naturally occurring elements.
Let us look at three examples;
The carbohydrate in food is composed of carbon, hydrogen and oxygen
The stainless steel materials we use are composed of iron, carbon and other trace elements
Glass is made up of silicon, oxygen and other elements
Only 90 naturally occurring elements capable of combining with each other to form millions of substances.
Compounds:
When two or more elements combine in a certain ratio to form a molecule.
For example-
Water is made up of two hydrogen and one Oxygen ration is 2:1.
If hydrogen and Oxygen combine inn 2:2, they for Hydrogen peroxide.
Water gives life and Hydrogen peroxide can kill a person.
Other examples are,
The carbohydrate in food is composed of carbon, hydrogen and oxygen. The stainless steel is made up of iron, carbon and other trace elements. Glass is composed of silicon, oxygen and other elements.Therefore, only 90 naturally occurring elements capable of combining with each other to form millions of substances.
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If you need to produce 9.75 moles of iron(III) oxide (Fe2O3), how many moles of iron will be required? *
Answer: Thus 9.75 moles of iron will be required.
Explanation:
The balanced chemical reaction is:
[tex]2Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
According to stoichiometry :
2 moles of [tex]Fe_2O_3[/tex] are produced by= 2 moles of [tex]Fe[/tex]
Thus 9.75 moles of [tex]Fe_2O_3[/tex] are produced by=[tex]\frac{2}{2}\times 9.75=9.75moles[/tex] of [tex]Fe[/tex]
Thus 9.75 moles of iron will be required.
Where does heat come from
Answer:
All matter contains heat energy. Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.
Explanation:
What are the four ions formed when sodium chloride undergoes electrolysis?
Answer: The four ions formed are [tex]H^+[/tex] , [tex]OH^-[/tex] , [tex]Na^+[/tex] and [tex]Cl^-[/tex]
Explanation:
Electrolysis is the process where electricity is used to drive chemical reactions.
In the electrolysis of aqueous solution of sodium chloride, hydrogen gas produces at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode and the sodium hydroxide remains dissolved in the solution.
The reactions will be :
[tex]NaCl\rightarrow Na^++Cl^-[/tex]
[tex]H_2O\rightarrow H^++OH^-[/tex]
Hence, electrolysis of an aqueous solution of sodium chloride lead to the formation of four ions,[tex]H^+[/tex] , [tex]OH^-[/tex] , [tex]Na^+[/tex] and [tex]Cl^-[/tex]
What happens when a base dissolves?
O A. It increases the concentration of OH in solution.
O B. It increases the concentration of Hi in solution.
O C. It is no longer dangerous.
O D. It adds oxygen to the solution.
Answer:
A. It increases the concentration of OH in solution.
Explanation:
Answer:
B. It increases the concentration of Hi in solution.
Explanation:
A.p.e.x
The light energy captured during photosynthesis is stored as
water.
sugar.
carbon dioxide.
electrons.
Answer:
Sugar
Explanation:
This is because water and carbon dioxide are required during photosynthesis. Oxygen along with glucose, that is a type of sugar is produced. The oxygen is diffused out in to the air, while the sugars are stored in the leaf thus light energy captured during photosynthesis is stored as 'sugar'
what is the formula and give the name of the compound formed by following ions: hydrogen, and nitrite. (hydrogen : H, group 1)
Explanation:
Hydrogen = H
Nitrite = NO₂⁻
The compound formed by Hydrogen and Nitrite is;
Name = Nitrous Acid
Formular = HNO₂
what happens when a book falls of a desk?
I'd barely seen you when you asked me if I hated you
Wasn't surprised but still had nothing I could say to you
I'm sorry if I ever made you feel the way you do
Yeah, I know I know you better than your parents
I heard about 'em, you don't gotta be embarrassed
You go online 'cause that's where you can be the saddest
You've been acting careless
Know you put on a happy face
You need someone who's gonna stay
I know you're crushed under the weight
Wanna hold you up, wanna hold you up
You keep things bottled up inside
I wish you'd give someone a try
You fell apart a million times
Wanna hold you up, wanna hold you up
Before my heart gives out
You're losing track of all the friends I know you used to have
Don't know what happened but the old you wasn't half as bad
I'm sorry no one sees what's going on inside your head
Yeah, I know I know you better than your parents
I heard about 'em, you don't gotta be embarrassed
You go online 'cause that's where you can be the saddest
You've been acting careless
Know you put on a happy face
You need someone who's gonna stay
I know you're crushed under the weight
Wanna hold you up, wanna hold you up
You keep things bottled up inside
I wish you'd give someone a try
You fell apart a million times
Wanna hold you up, wanna hold you up
Before my heart gives out
I know that you hate when I figure you out
You get so distant just so you can hear a sound
Swear that you've been gone but yet your body's still around
What are you doing now?
Know you put on a happy face
You need someone who's gonna stay
I know you're crushed under the weight
Wanna hold you up, wanna hold you up
You keep things bottled up inside
I wish you'd give someone a try
You fell apart a million times
Wanna hold you up, wanna hold you up
Before my heart gives out
Answer:
Happy Face excellent song
Explanation:
and gravity takes the book and pulls it to the ground
Based upon your knowledge of metallic activity, which element would most readily react with water?
A) Li
B) Zn
C) Cu
D) Fe
Answer:
d
Explanation:
Of the given options, Lithium (Li) would most readily react with water.
• The substances that spontaneously go through a chemical reaction with water, as they are highly reducing in nature are known as water reactive substances.
• The alkali metals and the alkaline earth metals are the metals that reacts the most with water.
• In the periodic table, the alkali metals, that is, lithium, sodium, potassium, rubidium, caesium, and francium are the most reactive metals.
• They all react explosively and vigorously with cold water leading to the displacement of hydrogen.
• The alkaline earth metals are the second most reactive metals in the periodic table apart from Be, which does not react with water.
Thus, Li is the alkali metal that reacts readily with water.
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Which one of the following statements is true?
Answer:
A calculator has an endifiite shape because all of its atoms are touching each other
3. How can a community help implement Ecological Solid Waste Management.
4. As a student, how can this program help you in your school?
Answer:
It help cause we compost food scraps and other organic wastes. We also reuse and recycle materials to organize for government and industry to develop community recycling materials.
It depend on your opinion as a student.
Explanation:
Hope it helps
Organizing a community to collect waste and implementing ecological solid waste management greatly helps to reduce pollution and landfilling also creates ideas for recycling.
What is solid waste management ?In order to build and sustain an efficient waste management programme, community-based waste management are partnerships between non-governmental organizations, governmental organizations, and the affected communities.
Community based waste management helps to direct participation and accountability of community members monitoring the collection and reduction of trash waste separation at the homestead level
Similarly they are using priceless and reusable goods on-site , recycling organic trash as well as public collection service collects and transports garbage to a treatment facility.
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#SPJ2
what reagents can be used to test for unsaturation of hydrocarbons?
Answer:
Bromine test is used to test the unsaturation of hydrocarbons.
Explanation:
Which compound has the smallest percent of chlorine?(1) HCl (3) LiCl(2) BaCl2 (4) NCl3
Answer:
KCI
Explanation:
Answer:
KCI
Explanation:
the most massive will have the smallest percent of Cl
How do temperature, humidity, and pressure vary within an air mass?
A.Temperature and humidity vary, but pressure does not.
B.Humidity makes the pressure in an air mass increase.
C.Temperature, humidity, and pressure are basically the same all through an air mass.
D.Temperature at the border of an air mass is always higher than in the middle.
Make sure to give me an explanation so I don't get dirt about me cheating. I just really need to know this simple question. Please, be so helpful.
Answer:
C
Explanation:
Temperature, humidity, and pressure are all the same through an air mass.
Explain how both analytical and creative problem-solving strategies can be applied to the following scenario. Jeff notices that his family's trashcan overflows the day before trash pickup each week. He suggests getting a bigger trashcan to solve the problem. Jeff's father tells him that the size and number of trash bags they can set out each week is limited by a city ordinance.
Answer: They can be apllied to the senario he can pettition or he can use bigger bags those are just a couple of ideas.
You can calculate the mechanical energy of an object by _____.
A. first calculating its thermal energy
B.adding its chemical energy and its electrical energy
C. subtracting its potential energy from its kinetic energy
D. combining its potential energy with its kinetic energy
Answer:
D - combining it's potential energy with it's kinetic energy
The last electron in an atom of oxygen is added to a ___ orbital.
a. 2p
b. 1p
c. 3p
d. 2s
Answer:
A
Explanation:
#12. How are the volume and pressure of a gas at constant
temperature related?
Answer:
The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law). Under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecules (Avogadro's law).
Explanation:
Hope it helped :)
FeO + C -----> Fe + CO2 balanced help
Answer:
2FeO + C ---> 2Fe +CO2
Explanation:
Help me on this question, will give brainliest.
show that the molecular formula of urea is CH4ON2 if the %by mass of 02 atoms is one mole of urea molecule is 26.66%
Answer:
Mostly, the molecule has a planar geometry allows free rotation of bonds. The chemical structure of the compound could be given as below. Urea Formula Molecular Mass. This molecule is generally available in final products of proteins of metabolism of humans and animals. Its main existence can be felt in the urine of humans that is formed
Explanation:
the molecular formula of urea is CH4ON2 if the %by mass of 02 atoms is one mole of urea molecule is 26.66%
which color does barium nitrate emits in a flame test? a. yellow b. orange c. green d. blue
yellow
coz i answered that already
What is the chemical name of the compound K2504?
Answer:
Potassium sulfate
Explanation:
I searched it up on the internet
Can I please have a brainliest
need help on this fast
If the Sun continues its evolution according to theory, what will be its last stage?
A.As a black hole
B. As a white dwarf
C. As a red giant
D. As a planetary nebula
Pls help
What will most likely cause a sudden wind to start blowing?
Answer:
wind is just high and low pressure of air, when a high pressure comes and crashes into a low pressure air pocket than it can form a wind storm.
Explanation:
The Uneven heating of the Earth's surface. Earth's rotation and unequal heating of the Earth's surface. air pressure towards regions of lower air pressure. ... air moving from areas of high pressure to areas of low pressure.
This is what will most likely cause a sudden wind to start blowing.
Astatine, At, is below iodine in Group 17 of the Periodic Table. Which statement is most likely to be correct?
A AgAt(s) reacts with an excess of dilute aqueous ammonia to form a solution of a soluble complex.
B Astatine and KCl(aq) react to from KAt(aq) and chlorine.
C KAt(aq) and dilute sulfuric acid react to form HAt(g).
D NaAt(s) and concentrated sulfuric acid react to form astatine.
What is true about a neutral atom? *
a. The number of electrons and protons are always the same.
b. The number of neutrons is always the same as the number of electrons.
c. The number of protons may change.
d. The mass number can be found by knowing the number of electrons.
e. The mass number can be found by knowing the number of neutrons of the atom.
Why doesn't the air pressure crush this tiny
flower?
Answer:
because air pressure crushes masses and or grams that have a stronger gravitaional
pull
when do you consider that a typhoon will enter or effect the country
Answer:
sorry I don't understand this subject sorry
Explanation: