what is combination reaction give two examples
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Consider 81.0 g samples of two different compounds consisting of only carbon and oxygen. Compound 1 consists of 22.1 g of carbon, and compound 2 has 34.7 g of carbon. Determine the ratio in whole numbers of the masses of carbon that combine with 1.00 g of oxygen between the two compounds.
Answers
Answer:
Compound 1: CO2
Compound 2: CO
Explanation:
The attachment illustrrates the calculations. The masses of both C and O are converted into moles of those two elelements and the resulting mole values are taken as ratios of the two elements. Compound 1 has twice as many moles of O as of C, so it's empirical formula must be CO2. Compound 2's O/C ratio is 1, so it becomes CO.
When NaCl is added to a solution of AgNO3, Pb(NO3)2, or Ca(NO3)2, in which case(s) does a precipitate fom?
A. AgNO3 only
B. Pb(NO3)2 only
C. Ca(NO)2 only
D. AgNO3 and Pb(NO3)2
Answers
When NaCl is added to a solution of AgNO₃, Pb(NO₃)₂, or Ca(NO₃)₂,a precipitate will form only in Ca(NO₃)₂ only.
What is double displacement reaction?In a double displacement reaction, the reacting substances exchange their ions or bonds and form new compounds
In a double displacement reaction, only ionic compounds can take part and compounds of only those metal reacts which will be almost having equal reactivity.
For example -
Sodium chloride can react with Potassium sulphate to form Sodium sulphate and Potassium chloride.
Barium nitrate can react with Lead sulphate to form Barium Sulphate and Lead nitrate.
Therefore, When NaCl is added to a solution of AgNO₃, Pb(NO₃)₂, or Ca(NO₃)₂,a precipitate will form only in Ca(NO₃)₂ only.
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How might you separate a mixture of iron fillings and salt?
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Answer:
You use a magnet and the fillings will go with the magnet.
What is the Color of potassium heptaoxodichromate (v)
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Answer:
orange
Explanation:
The color of potassium hepaoxodichromate is orange.
Answer:
it's very bright red orange in color.
Explanation:
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To reduce the costs of extracting aluminum, what must be added to it to reduce the melting point? A. Bauxite B. Cryolite C. Cathode D. Anode
Answers
Answer:
cryolite
Explanation:
B B B B B
cryolite is the answer
*
Water vapor deposes into frost. What are the frost particles made of?
Molecules of Hydrogen
Molecules of H2O
Molecules of Oxygen
Molecules of Hydrogen and Molecules of Oxygen
Answers
Answer:
Molecules of H2O
Explanation:
Frost is condensed vapour and vapour is gaseous water. So, their particles are made up of same particles as water, i.e., H2O.
Which of these answers describes a scientific law?
(Pls)
Answers
Answer:
big ablsolty long pp
Explanation:
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Use you observation to determine which polymorph is in the customer’s returned chocolate sample.
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Cocoa butter, the fat in chocolate, can crystallize in any one of 6 different forms (polymorphs, as they are called). Unfortunately, only one of these, the beta crystal (or Form V), hardens into the firm, shiny chocolate that cooks want. Form VI is also a stable hard crystal, but only small amounts of it form from the good beta (Form V) crystals upon lengthy standing. When you buy commercial chocolate it is in the form of beta crystals.
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
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Can someone help me?
Which element would have the lowest electronegativity?
an element with a large number of valence electrons and a small atomic radius
an element with a large number of valence electrons and a large atomic radius
an element with a small number of valence electrons and a large atomic radius
an element with a small number of valence electrons and a small atomic radius
Answers
Answer:
an element with a large number of valence electrons and a large atomic radius
Explanation:
Electronegativity means a tedency when an atom attracts bonding electrons in a covalent bond situation.
» If an atom has many valency electrons [ empty orbitals in outermost shell ], it has difficulty in attracting electrons hence electronegativity low.
» If an atom is large, its nuclear attraction force of incoming electrons is low hence low electronegativity.
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The element that would have the lowest electronegativity is an element with a small number of valence electrons and a large atomic radius.
Both electronegativity and atomic radius are periodic trends. Electronegativity increases across the period while atomic radius decreases across a period.
An element that has a small number of valence electrons and a large atomic radius will most likely be a metal hence it will have the lowest electronegativity.
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Why are intensive properties useful for identifying a substance?
a
They are chemical properties.
b
They describe the amount of substance you have.
c
They are physical properties.
d
They do not depend on the amount of substance you have.
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Answer:
d
They do not depend on the amount of substance you have.
Intensive properties useful for identifying a substance because they do not depend on the amount of substance you have.
WHAT ARE INTENSIVE PROPERTIES:
Intensive properties are physical properties of a substance that do not depend on the size or amount of a sample e.g. density, temperature, colour, boiling point etc. On the other hand, extensive properties are dependent on the size of a substance e. g. mass, volume, weight etc. Intensive properties of a substance do not change with respect to size, hence, they can be used in the identification of a substance.Learn more: https://brainly.com/question/3006850?referrer=searchResults
what is a complex permanent tissue? mention the major functions of this tissue .
Answers
Answer:
Complex permanent tissue is defined as a collection of structurally dissimilar cells performing a common function or set of functions.
its functions are:
1.help in the transportation of organic material, water, and minerals up and down the plants.
2.it helps in transportation of food from leaves to other parts of plants.
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Classify the items based on whether they are or are not matter.
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Answer:
Matter:
toothpaste
gasoline
bacteria
cell
Not matter:
happiness
sound
Explanation:
Matter is something that has mass and volume. Happiness is just a feeling, it doesn't exist in 3d world. Sound is a wave or just the movement of matter (particles of matter). Others have masses and volumes.
Give reason
1) The efficiency of a practical machine is less that 100%.
1) The efficiency of a machine can be increased by using lubricants in the movable parts.
Answers
Explanation:
The efficiency of a practicle machine is less than 100% because some of the applied force is wasted due to oovercoming friction.The efficiency of a machine can be increased by using lubricants in the movable parts because lubricants helps to reduce friction.I hope it helped U
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What is the density of a piece of metal with a
mass of 23.5 g and a volume of 11.1 mL? You
will report in units of g/mL. Please answer only
with a number. Include only two decimals in
your answer.
Answers
The density of the piece of metal is 2.12g/mL
HOW TO CALCULATE DENSITY:
Density, which refers to the mass of an object in relation to its volume, can be calculated by dividing mass by volume. That is;Density (g/mL) = mass (g) ÷ volume (mL)
According to this question, a piece of metal has a mass of 23.5 g and a volume of 11.1 mL, hence, the density can be calculated as follows:Density = 23.5/11.1
Density = 2.12g/mL
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985 grams converted to kilometers
Answers
Answer:
?
Explanation:
did you mean kilograms?
good morning friends
what is electric configuration?
write the electric configuration of chlorine..
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Answer:
The systematic representation for the distribution of electrons in different energy levels of an atom or orbital of an atom is called electronic configuration .
The electronic configuration of chlorine is 1s^2,2s^2,2p^6,3s^2,3p^6
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What are two factors that can change the rate of a chemical?
Answers
Answer:
the surface area of a solid reactant.
temperature.
presence/absence of a catalyst.
if you have observed something about the world and want to investigate it further, what are you seeking to do?
Answers
I'm seeking to ASK A QUESTION in accordance to the scientific method.
WHAT IS SCIENTIFIC METHOD:
Scientific method is the step by step procedure employed by scientists in order to investigate an occurrence or phenomenon in the world.The steps involved in the scientific method, which begins with making an observation, are as follows:
Make an observationAsk a question based on the observationFormulate a hypothesisTest the hypothesis via experimentationAnalyze result dataDraw conclusionAccording to this question, after observing something about the world and I want to investigate it further by asking a question as the next step.
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Can someone plz help me plz giving brainliest
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Answer: yes because it talks about what he pacifically he did and what the results was and he would probably need 2 get a little more data
Explanation:
please help if there are any experts please tell me whhich is correct
Answers
I believe that the answer to your question is letter D, normal line.
Additionally, according to the law of reflection, the angle of incidence is equivalent to the angle of reflection. This means that the angle of reflection is the angle between the normal line and the reflected ray.
I hope that this has helped you. Good day to you.
Which of the following are decomposition reactions?
A. CH4 (9) +202 (9) - CO2 (g) + 2H20 (9)
B. N2 (9) + 3H2 (9) ► 2NH3 (9)
C. CaCO3 (s) - Cao (s) + CO2 (9)
D. 2H20 (1) ► 2H2 (9) + O2 (9)
Answers
Answer:
C and D
Explanation:
A reaction is said to be decomposed, if the reactant is broken down to liberate single element.
My friend asked, Our sale is being used to measure
flour. What was the scale really measuring about
the flour?
A) color of flour
B) volume of flour
C) weight of flour
D) temperature of flour
Answers
The 4f subshell of an atom contains 14 electrons. What is the maximum number
of electrons having same spin in it?
Answers
Answer:
I hope it will help you
Explanation:
Please make me brainlest THANK UHow do the respiratory system and circulatory system interact? (1 point)
o
In the lungs, carbon dioxide is transferred to the blood and carried by red blood cells. Once it is distributed, the red blood cells
pick up oxygen and transport it back to the lungs, where is transferred to the lungs so it can be exhaled.
O
In the lungs, oxygen is transferred to the blood and carried by red blood cells..Once it is distributed, the red blood cells pick up
carbon dioxide and transport it back to the lungs, where is transferred to the lungs so it can be exhaled
The respiratory system and circulatory system do not interact because the respiratory system is related to breathing and the
circulatory system is related to blood.
O
In the lungs, air is transferred into the blood stream, where red blood cells deliver it to the heart. The heart then separates the
oxygen and sends it to the organs, while sending the waste back to the lungs to exhale.
Answers
Explanation:
The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart
(a) Explain why ammonia has a low boiling point
Answers
Explanation: Ammonia has pretty strong intermolecular forces because it can form hydrogen bonds, however it can't form as many hydrogen bonds per molecule as water and so its boiling point and melting point are lower.
As ammonia has less intermolecular force of attraction, it have usually low boiling point.
What is hydrogen bonding?Hydrogen bonding is not a covalent bond to a hydrogen atom, but rather a type of dipole-dipole attraction between molecules.
The attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as an N, O, or F atom and another very electronegative atom causes it.
When a hydrogen atom bonded to an electronegative atom approaches another electronegative atom, strong intermolecular forces are created.
Simple molecules include hydrogen, ammonia, methane, and pure water. All of them have strong covalent bonds among both their atoms but much weaker intermolecular forces.
When one of these substances melts or boils, the weak intermolecular forces, not the strong covalent bonds, break.
Thus, ammonia usually have low boiling point.
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Sugar C12 H22 011 can be classified as a element, heterogeneous mixure, solution, compound
Answers
Answer:
The answer is a compound.
it is a compound as it contains different elements
Explanation:
how to calculate valency of atoms?
Answers
Answer:
The valency of a molecule is zero.
Explanation:
Valency is calculated by calculating number of electrons present in outermost orbitals of atom of element.
Hope it is helpful.....If a lab fire erupts, immediately
A) notify parent or guardian
B) run for fire extinguisher
C) throw water on fire
D) open window
Answers
Answer:
B
Explanation:
best way to put off the fire
Answer:
b
Explanation:
by the time you tell some one the fire could have spread and throwing water could spread the fire and opening the window adds fuel to the fire so it can burn hotter
Isotope ?-1 has an atomic mass of 1.
99.985% of all atoms of element ? are of this
form.
Isotope ?-2 has an atomic mass of 2
0.015% of all atoms of element ? are of this form.
Answers
Answer: Isotope-1: Hydrogen (H)
Isotope-2: Deuterium (H)
Explanation: The periodic table shows that the smallest element in hydrogen (H), at an average atomic weight of 1.008. Hydrogen-1 has one proton, one electron, and no neutrons, which adds to 1 AMU. Hyrogen-2 is an isotope of hydrogen that contains 1 neutron in addition to the proton, bringing the mass to 2 AMU. It is only at 0.0156% abundance on Earth and is given the name Deuterium, sometimes refered to as "heavy water" when incorporated into a water molecule. A third isotope has 2 neutrons, and is called Tritium.
Which sentence best describes how matter moves through an ecosystem?
A.
Matter only moves from producers to decomposers.
B.
Matter only moves from consumers to producers.
C.
Matter is made by producers and is destroyed when eaten.
D.
Matter is continually cycled through an ecosystem.
Answers
Answer: D
Explanation: A healthy ecosystem is capable of exisitng based on the matter within that ecosystem. Energy is often supplied externally (e.g., the sun, geothermal, etc.) and is stored by the ecosystem in the form of chemical bonds made between the elements. Plants utilize matter (minerals, carbon dioxide, water) within the ecosystem (plus whatever is delivered via asteroid or candy wrappers). Animals depend on the plants for both energy and matter that is transformed into the compunds needed for their existence. Decomposers act to reduce complex matter (plants and animals) back into more basic compounds that then reenter the ecosystem as raw material for he next set of plants, animals, humans, and aliens.