Answer:
2.5
Explanation:
NEED THIS DONE ASAP HELP A GIRL OUT!
Answer:
5) electrons
6) protons
7) neutrons
8) electrons
sorry honey, I don't know 4
CHEMISTRY
(a) A list of compounds is shown.
aluminium oxide
calcium bromide
calcium oxide
ethane
ethene
hydrogen chloride
methane
nitrogen dioxide
potassium iodide
potassium manganate(VII)
sodium chloride
Answer the following questions using only the compounds in the list.
Each compound may be used once, more than once or not at all.
Which compound:
(i) when in acidified solution, is used to test for sulfur dioxide
[1]
(ii) is the main constituent of natural gas
[1]
(iii) when dissolved in water, gives a yellow precipitate on addition of acidified aqueous
silver nitrate
.... [1]
(iv) is used in flue gas desulfurisation to neutralise acidic gases
(1)
(v) is a reactant used in the manufacture of ethanol?
[1]
(b) What is the meaning of the term compound?
[2]
1.The solution will gradually become colorless as the sulfur dioxide reacts with the potassium permanganate(Potassium manganate(VII))
The reaction
2MnO₄⁻ (aq) + 6H⁺ (aq) + 5SO₃²⁻ (aq) -> 2Mn²⁺ (aq) + 3H₂O (l) + 5SO₄²⁻ (aq)
2. Natural gas is a mixture of hydrocarbon gas with methane (CH₄) as the main composition in addition to other gases such as CO₂ and H₂
3. Halide ions are detected using silver nitrate (acidified using nitric acid) which forms deposits of different colors
Br-Bromide ions: cream
Cl-Chloride ions: white
I-Iodide ions: yellow
so the answer Potassium iodide
4. Compounds that are alkaline are useful for neutralizing acids including the desulfurization process to neutralize acidic gases (SO₃). The bases used are lime or caustic soda
Lime can be Calcium oxide (CaO - quicklime)
5. Ethanol (C₂H₅OH) can be made from C₂H₄ (ethene) with steam, apart from the Alcoholic fermentation of glucose
6. Compounds are formed from 2 or more types of elements which can be ionic compounds or covalent compounds
Which elements likely conduct electricity well? Check all that apply.
chromium
iodine
carbon
calcium
osmium
Chromium, carbon and calcium
I did the same quiz and got a 100 (Brainliest pls)
how will you seperate dye from black ink? draw a neatly labelled same?? fast I will mark brainly 100%
Answer:
put it through a distillery
Which of the following statements is true? Atoms of isotopes of an element have different numbers of electrons. Atoms of isotopes of an element have different numbers of neutrons. Atoms of the same element all have the same mass. Atoms of isotopes of an element have different numbers of protons.
Answer:
atoms of isotopes of an element have different numbers of neutrons.
Explanation:
isotopes have the same number of protons, but different numbers of neutrons.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Atoms of isotopes of an element have different numbers of neutrons.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
One element can have isotopes of its own. Isotopes are the atoms of element with same atomic number but different mass number. Example Hydrogen has three isotopres like hydrogen, deuterium and tritium with mass number 1, 2 and 3 respectively. Atoms of isotopes of an element have different numbers of neutrons.
Therefore, atoms of isotopes of an element have different numbers of neutrons. The correct option is option B.
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3. A hawk gets some help while flying by using convection
currents (air currents created by rising warm air). How is the Sun
involved in creating convectior currents?
Answer:Explanation:
Convection drives the circulation of air in the earth's atmosphere. The sun heats the air near the earth's equator, which becomes less dense and rises upward. As it rises, it cools and becomes less dense than the air around it, spreading out and descending toward the equator again.
Explanation:
The diagram shows the moon and Earth in space. Which is the best label for the dotted-line arrow?
O force of Earth's gravity
O moon's attraction to the Sun
moon's motion without gravity
O orbit of the moon around Earth
arth
Answer:
The answer is c) moon’s motion without gravity
Explanation:
I just took the quiz and I got 100 percent on Edgenuty :)
The dotted-line arrow is representing the path the moon would take if there was no force of gravity on the earth. Therefore, option (C) is correct.
What is gravity?Gravity can be explained as a force that attracts an object toward the center of the earth or any physical system that has mass. Each body with mass exerts a force or gravity on every other body with mass. Gravity is the force that keeps the moon around the earth and the planets in orbit around the sun.
In the universe, each particle with mass attracts another particle with a definite force, and that force acting is a product of the masses of those bodies.
Mathematically gravity acting between masses can be written as:
[tex]F =G\frac{q_1q_2}{r^2}[/tex]
Where F is the force, m and M are masses, G is the universal gravitational constant and r is the separation between them.
If the moon follows the dotted arrow which moves straight ahead it can be only possible if the moon's motion is without gravity.
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The x-axis of a velocity-time graph represents____.
Answer:
i think the answer is Y
Explanation:
Answer:
Both graphs tell you how something is changing over time. In a velocity-time graph, time is on the horizontal axis, or x-axis, and velocity is on the vertical axis, or y-axis. ... The rising line on the velocity-time graph shows where the acceler- ation is positive. The steeper the line, the greater the acceleration.
Explanation:
which combination of atoms will form a molecule but not a compound?
Answer:
X and Y
Explanation:
There is no explanation
Answer:
x and w
Explanation:
mark runs to catch a ball. Explian how the structure of muscle tissue helps him perform this function
Answer: Skeletal muscle tissue helps marks body to perform to this activity as it has such supportive structure and position in the body that he is able to do it
Explanation:
Answer:
Muscles give structure and power for any kind of movement, so the tissue needs to be flexible and tightly packed for movement. The tight bands of tissue shown in the picture allows this movement to occur.
Explanation:
answer on edmentum.
what is the mass number notation for silicon ?
Answer: atomic number 14 and atomic mass 20.086
Explanation:
Have a graph
An atom can be called a particle, but a molecule is never called a particle. True or False ?
Answer: False; it contains particles, but that doesn't mean it's a particle itself.
Hope this help.
The statement is false, both atoms and molecules could be referred to as particles.
An atom is defined as the smallest particle of a substance that can take part in a chemical reaction.
An atom is the smallest particle of a an elemental substance while a molecule is the smallest particle of a compound. Compounds are made up of molecules which are neutral particles.
The main difference between an atom and a molecule is that a molecule is a group of atoms held together by a chemical bond while atoms just occur individually.
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Plz help!
What needs to be added or taken away to cause a change in state?
Answer:
One change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.
Which properties describe elements that are nonmetal gases?
Answer:
Explanation:
Nonmetals share many similar properties including:
They are either gas (hydrogen, oxygen, nitrogen) or solid (carbon, sulfur) under standard conditions.
They are not good conductors of electricity or heat.
They are very brittle in their solid form.
They are not malleable or ductile.
Weight is a measure of the pull of gravity on and object
Answer:
True.
Explanation:
You didn't provide an answer, but I'm assuming this is a T/F question.
what is experiment ? explain in teacher's language
Answer:
A scientific experiment undertaken to make a discovery, to test a hypothesis or to demonstrate a known fact.
Explanation:
Experiment is described as attempting something new or testing a theory. An example of an experiment is when you try a new style of hair. An example of an experiment is when you use test tubes and chemicals in a chemistry lab to complete a project to try to better understand the chemical reactions.
is this correct or am I wrong. say something if it's wrong.
Answer: Light waves are correct, sounds waves are not.
Explanation: Sound waves are close to light waves however they are closer together, hope this helped :)
Seems about correct to me.
Please help answer this question correctly. My life depends on it!
Answer:
I looked it up so the answer is for sure A
Explanation:
Produces both urea & bile.
Answer:
Liver
Explanation:
The liver is an accessory digestive organ that is involved in detoxifying metabolites from the blood. It also produces compounds necessary for digestion. Some of these products include urea and bile.
ethane is a substance that is used when making plastic. a molecule of ethane is made of two carbon atoms and six hydrogen atoms. the carbon atoms are joined by the chemical bond. each of the hydrogen atoms is joined to one of the carbon atoms by a chemical bond. which is an accurate model of ethane?
Help ASAP!!!
Answer:
C
Explanation:
Option C is an accurate model of ethane.
Ethane is an alkane that has two carbon atoms bonded together and each atom has three hydrogen atoms that are attached to them. Ethane has single bonds and that makes it an alkane.
This model of ethane has six carbon-hydrogen bonds shown with solid lines that are protruding out. Rotation that takes place about the carbon-carbon bond actually results in the different molecular conformations of ethane.
Which type of reaction is NaCl + AgNO3 – NaNO3 + AgCl? synthesis decomposition oxidation replacement
Answer:
Replacement
Explanation:
i took the quiz :)
Given reaction in the question is a type of replacement reaction because in that reaction sodium atom replaces the silver atom from the silver nitarte molecule.
What is replacement reaction?Replacement reactions are those reaction in which one or two atoms will replaced by another atoms.
In the given chemical reaction, sodium atom replaces the silver atom from the silver nitarte molecule as a result od which we get different products.
Decomposition reactions are those in which one compound will break down into two or more molecules.Synthesis reactions are those in which new products will formed by the combination of reactants.Oxidation reactions occur when the addition of oxygen atom and removal of hydrogen and electron takes place.Hence the given reaction is the replacement reaction.
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Which is the amount of matter in an object?
A. weight
B. mass
C. volume
D. pounds
Answer:
c. mass
Explanation:
In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.
Explanation:
I think the Answer is C .Thank you ☺️☺️
What tool do we use to measure volume
Answer:
Graduated cylinders, beakers, volumetric pipets, burets and volumetric flasks are five kinds of glassware often used to measure out specific volumes. Volumetric pipets, flasks and burets are the most accurate; the glassware makers calibrate these to a high level of accuracy.
Explanation:
hope this helps :)
Most of the carbon on the Earth is stored in volcanoes, True or False?
Answer:
true
Explanation:
Volcanos is rock and there's where the carbon stored at.
The period on the periodic table(1-7) tells you the number of ________ in an atom.
A. energy levels
B. electrons on the last energy level
Answer:
Electrons on the last energy level.
The period on the periodic table (1 to 7) tells the number of energy levels in an atom. Therefore, option A is correct.
What are periods in the periodic table?The horizontal rows in the modern periodic table are known as periods. All elements placed in a particular period have an equal number of electron shells. Each next element exceeds one proton in a period and so exhibits less metallic character than its precursor.
The atomic number of the elements increases from left to right in a period that gives information about the number of electrons and protons increases in an atom. As in a period, elements have filled an equal number of electron shells, but an increased electron in the same shell causes an increase in the nuclear charge. Therefore, the atomic radius of an element of the elements reduces in a period.
Therefore, the elements in the same period (1 to 7) have the same number of electron shells or energy levels.
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While participating in a blood drive at school, Keona learns that blood has a density of 1.06 g/mL. She donates one pint of blood, which is equal to 473.176 mL.
What is the mass of the blood Keona donates, to the nearest hundredth of a gram?
The mass of the blood Keona donates is
g.
Answer:
501.57g because g=1.06×473.176
Explanation:
Answer:
the other person was right
Explanation:
What is the mass of 23 moles of lithium atoms
Take 23mols and multiply it by the atomic mass of Li:
23mol * 6.94g/mol = 159.62g
LOOK AT THE IMAGE ABOVE CAN SOMEONE PLEASE HELP ME AND SHOW FULL STEPS PLEASE
answer:
no
explanation:
cause you dumb
Can somebody plz google these!!! it’s not very complicated, I just can’t find it.
Only question
WILL MARK AS CROWN)
:D
black peppered moths have higher survival rate
Explanation:
i believe black peppered moths would survive at a higer rate than white moths. black peppered moths could blend with the environment while white moths would stick out and make its self more vulnerable to predators.
The work function of a silver surface is 4.73 eV. What would happen if the silver is hit with a photon with 2.5 eV of energy?
A) One electron is released from the metal.
B) A pit forms in the metal due to the impact
C) Nothing, the photon just bounces off the surface.
D) Two electrons are released from the metal.
Answer:Nothing, the photon just bounces off the surface.
Explanation:
According to Albert Einstein, a photoelectron can only be emitted from a metal surface when the energy of the incident photon is greater than the work function of the metal.
In the scenario described in the question, the work function of the metal is greater than the energy of the photon. Hence, the photon just bounces off the metal surface without emitting any electron.
Answer:
The correct option is;
C) Nothing, the photon just bounces off the surface
Explanation:
The given parameters are;
The work function of the silver surface = 4.73 eV
The amount of energy of the photon = 2.5 eV
The kinetic energy, KE[tex]_e[/tex] of an electron when ejected from a metal surface is given as follows;
KE[tex]_e[/tex] = h·f - B·E
Where;
hf = The energy of the photon
B·E = The work function of the metal
Whereby the energy of the photon impacting on the surface of the silver is equal to or larger than the work function of the silver surface, then the energy of the photon can be reach the electrons of the silver so as to be enable the electron to be ejected through the metal surface
However, given that the energy of the photon, 2.5 eV, is less than the work function of the silver surface, 4.73 eV, the kinetic energy of an ejected electron, KE[tex]_e[/tex], is less 0, therefore, no electron will be ejected form the surface of the silver and the photon just bounces off the surface.