Answer:
i just feel rlly bad that you need it now, i cant help but all i can say is you got this mate
20 points to whoever can answer these 3 questions correctly
Answer:
1) A. NO
2) B. 4
3) D. 8
Explanation:
What is the minimum temperature for hot water when using
heat to sanitize in a manual operation?
0 171°F
160°F
O 184°F
O 71°F
Answer:
171°F is the answer of this question
the scientist who discovered carbon dioxide gas
Answer:
Joseph Black discovered carbon dioxide.
Explanation:
How many valence electrons does the following element have? 1s2 2s2 2p6 3s1
What is the volume of a container containing 7.59 moles of krypton gas at STP?
170.034 L is the volume of a container containing 7.59 moles of krypton gas at STP.
What is an ideal gas equation?
The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
Using the ideal gas equation
PV =nRT
Where P is the pressure
V is the volume
n is the number of moles
R is the ideal gas constant (R = 0.08206 L atm mol⁻¹ K⁻¹)
T is the temperature.
From the given information
V =?
n = 7.59
and at STP
P = 1 atm
T = 273 K
Putting the parameters into the formula, we get
PV =nRT
1 atm x V = 7.59 mol x 0.08206 L atm mol⁻¹ K⁻¹ x 273 K
V = 170.034 L
Hence, 170.034 L is the volume of a container containing 7.59 moles of krypton gas at STP.
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a. How does the atomic radius change going down and across the periodic table?
B. How does first ionization energy change going down and across the periodic table?
Answer: A when going down the periodic table your atomic radius will get bigger same if you got to the side. B Moving left to right within a period or upward within a group, the first ionization energy generally increases
Explanation:
Changes in thermal energy provide evidence that a chemical reaction
has occurred. Which of the following BEST describes a chemical reaction
in which energy is released?
Select one:
Exothermic reaction.
Reversible reaction
Physical reaction
Endothermic reaction.
Answer:
Exothermic reaction
Explanation:
Exothermic reaction is a reaction in which energy is evolved from the reaction to the surroundings
Which of these have a double bond? Pick all that apply:
SiCL2Br2
H2O
HBr
SeBr2
CO2
Answer: Here goes ur answer
CO2
Explanation:
formula of barium hydroxide and potassium superoxide
Answer:
Barium hydroxide Ba(OH)2
Potassium superoxide KO2
which alkaline earth metal is the components of quick lime
Answer:
Calcium
Explanation:
is a silver-gray metal which takes its name from the Latin word calx, which means lime. It is the fifth most abundant element in the earth's crust and is widely distributed as limestone (CaCO3), quicklime (CaO) and calcium fluoride.
Alkaline earth metals are present on the left of the periodic table. Therefore, calcium is the alkaline earth metal is the components of quick lime.
What is metal ?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
The properties of metals are:
1.Since metals have free electrons that's why they can conduct electricity
2. Since atoms in metals are very closely packed in a definite crystal so these are solid. It is not brittle that is it can not be broken down easily
3. It does not react with water easily.
4.It is denser than water hence it sink in water.
The formula for quick lime is quicklime (CaO). The alkaline earth metal that is component of quick lime is calcium Ca. Quick lime is used in white washing.
Therefore, calcium is the alkaline earth metal is the components of quick lime.
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10. Un volumen de 1.0 mL de agua de mar contiene casi 4.0 3 10212 g de Au. El volumen total de agua en los océanos es de 1.5 X 1021 L. Calcule la cantidad total de Au (en gramos) existente en el agua de mar y su valor total en dólares (Suponga que el oro tiene un precio de 948 dólares por onza)
Answer:
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Explanation:
which alkaline earth metal is the components of slaked lime
Answer:
calcium hydroxide.............
The Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.
What is the Alkaline Earth metal?The alkaline earth metals are those elements that correspond to group 2 in the modern periodic table which includes beryllium, magnesium, calcium, strontium, barium, and radium. The elements in this group are quite similar in their physical and chemical properties.
For above information, Calcium is the [tex]20^t^h[/tex]element and Magnesium is the [tex]12^t^h[/tex] element in the periodic table.
Chemically, the given materials which are mentioned above is represented in following manner.
Limestone is Calcium Carbonate -[tex]CaCO_3[/tex]
Slaked Lime is Calcium Hydroxide - [tex]Ca(OH)_2[/tex]
Quicklime is Calcium Oxide - CaO
Gypsum is Calcium Sulfate Dihydrate - [tex]CaSO_4.2H_2O[/tex]
Epsom salt is Magnesium Sulfate - [tex]MgSO_4[/tex]
Limestone decomposes into slaked lime on heating, and slaked lime is formed on hydration of slaked lime.Gypsum is an important component in the manufacture of cement. The hydrate of gypsum is known as Plaster of Paris.Epsom salt has some uses in plants.Thus, the Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.
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The above question is incomplete. Completed question is Which alkaline earth metal is the components of the following. Materials lime stone , slaked lime , quick lime , gypsum , Epsom salt.
If N and O were to bond, the difference in electronegativity would be
and we would expect the bond to be
ionic, covalent)
Answer:
The bonds between nitrogen and oxygen are covalent bonds made from sharing electron pairs. The electronegativity of oxygen is 3.5.
How many times as bright as a light that is 90 m away from you does a light that is 10 m away from you appear?
Answer:
81 x as bright
Explanation:
The intensity of light is dependent on distance according to this simple equation:
(90/10)^2 = 9^2
= 81
This was derived from the inverse-square law. Respectively a light that is 10 m away from you is 81 x as bright.
why is carbon classified as an element
Answer:
D: It combines with oxygen to form a gas.
Explanation:
Carbon is classified as an element because of its ability to combine with other elements and form a new substance or compound.
Looking at the options, the correct option in the light is option D
What is the key difference between a liquid and a gas?
A. average kinetic energy
B. intermolecular attractions
C. the ability to flow
B. intermolecular attractions.
What are the two types of microscopes?
+
Answer:
1) The light microscope. The common light microscope used in the laboratory is called a compound microscope because it contains two types of lenses that function to magnify an object. The lens closest to the eye is called the ocular, while the lens closest to the object is called the objective. Most microscopes have on their base an apparatus called a condenser, which condenses light rays to a strong beam.
2) Other light microscopes. In addition to the familiar compound microscope, microbiologists use other types of microscopes for specific purposes. These microscopes permit viewing of objects not otherwise seen with the light microscope.
3) The fluorescent microscope uses ultraviolet light as its light source. When ultraviolet light hits an object, it excites the electrons of the object, and they give off light in various shades of color. Since ultraviolet light is used, the resolution of the object increases. A laboratory technique called the fluorescent‐antibody technique employs fluorescent dyes and antibodies to help identify unknown bacteria.
Which is true of multicellular organisms?
A. Their cells lack a nucleus.
B. Their cells are eukaryotic.
C. They have no fertilized eggs.
.
Metion two common types of flames and conditions under which each is produced
Answer:
natural flame,oxidising flame
Describe the effects of anaerobic respiration on the body and explain the effects on the body
Answer:
In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.
please mark my anSwEr as brainlist
Answer:
In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.
Explanation: Living things need energy for everything they do, including growing and reproducing. This energy comes from glucose. All animals and humans get glucose through eating it, but plants need to make their own glucose during photosynthesis.
Plants and animals transport glucose and oxygen to tiny structures in their cells, called mitochondria. Here, the glucose and oxygen take part in a chemical reaction. The reaction is called aerobic respiration, and it produces energy which transfers to the cells.
Aerobic respiration makes two waste products:carbon dioxide and water. Animals remove carbon dioxide from their bodies when they breathe out. In daytime, plants use some of this carbon dioxide for photosynthesis. At night, they release the carbon dioxide to their surroundings.
an object that is moving will stop when
Answer:
factor
Explanation:
Answer:
something pushes or pulls it to a stop.
how many atoms are there in 6.4 moles of H2?
Answer:
7.71 ×10²⁴ atoms (3 s.f.)
Explanation:
Please see the attached picture for the full solution.
☆ or number of atoms, or fundamental units
(this is sometimes written as number of particles)
Further explanantion:
(☆:) Here, we are looking at the number molecules since H₂ is a molecule.
1 mole of a substance is the amount of substance which contains the same number of particles. Thus, when using Avogadro's Constant, the units that we are looking at follows the units of the question. Then, look at what the question is asking for and answer accordingly.
The 2nd picture shows an example of another molecule, H₂O.
Some other examples would be:
1 mole of Na (an atom) --- 6.022 ×10²³ atoms
1 mole of CO₂ (a molecule) --- 6.022 ×10²³ molecules
1 mole of Na+ --- 6.022 ×10²³ ions
Thus, if we look at the 2nd image again, we can say that 1 mole of H₂O contains 6.022 ×10²³ molecules since H₂O is a molecule. However, if the question is asking for the number of atoms, it is not right to say that there are 6.022 ×10²³ atoms. Instead, there are 1.2044 ×10²⁴ H atoms and 6.022 ×10²³ O atoms, giving us a total of 1.8066 ×10²⁴ atoms in 1 mole of H₂O.
32. A sample of potassium is composed of 23% K-39, 48% K-40 and the remainder K-41. Calculate the average mass
of the sample.
Answer:
40.06 amu.
Explanation:
From the question given above, the following data were obtained:
Isotope A (K-39)
Mass of A = 39 amu
Abundance of A = 23%
Isotope B (K-40)
Mass of B = 40 amu
Abundance of B = 48%
Isotope C (K-41)
Mass of C = 41 amu
Abundance of C = 100 – (23 + 48)
Abundance of C = 100 – 71
Abundance of C = 29%
Average mass =?
Average mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(39 × 23)/100] + [(40 × 48)/100] + [(41 × 29)/100]
= 8.97 + 19.2 + 11.89
= 40.06 amu
Thus, the average mass of potassium is 40.06 amu
How many moles of hydrogen are produced from the reaction of 3.0 moles of zinc?
Answer:
3 moles
Explanation:
What is Haber's process? Write it with chemical reaction.
Answer: Habers process is the industrial process used for the production of ammonia
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
Explanation:
Habers process is the industrial process used for the production of ammonia. It uses hydrogen from natural gas and nitrogen mainly from atmosphere under extremely high pressures (150-200atm) and moderately high temperatures [tex](400-450^0C)[/tex].
The catalyst used in Habers process is iron.
The balanced chemical reaction is:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
3. A 500Kg block of aluminium has a volume of 0.185m3. Calculate it's density.
Answer:
Density = mass/volume
Density = 500 kg/0.185m3
Density = 2702.7 kg/m^3
Hope this helps!
Answer:
2702.7 kg/m3
Explanation:
d= 500kg / 0.185m3
d=2702.7 kg/m3
state the kinetic theory of matter
Answer:
The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.
different states of matter and characteristics of each state
Explanation:
[tex] \boxed{ \text{States \: of \: matter}}[/tex]
Matter exists in three physical states. They are :
SolidLiquid Gas✰ [tex] \underline{ \text{Characteristics \: of \: solid}} : [/tex]
They have fixed shape.They have fixed volume.They do not flow.They cannot be compressed , because their molecules are closely packed.They are mostly hard.[ Stones , bricks etc are some of the examples of solid ].
✰ [tex] \underline{ \text{Characteristics \: of \: liquid}} : [/tex]
They don't have a fixed shape but can take the shape of their container.They cannot be compressed.They flow from one place to another as their molecular are loosely packed.They have fixed volume.[ Water , Ink , Milk , Cooking oil , petrol etc are some of the examples of Liquid ] .
✰ [tex] \underline{ \text{Characteristics \: of \: gas}} : [/tex]
They don't have fixed volume.They can flow very easily.They can be compressed easily.They do not have fixed shape as the position of their molecules are not fixed.[ Air , oxygen , carbon dioxide etc are some of the examples of gas ] .
Hope I helped ! ♡
Have a wonderful day / night ! ツ
# [tex] \underbrace{ \tt{Carry \: On \: Learning}}[/tex] ! ✎
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HOW CAN I DO AN EXPERIMENT WITH THIS THINGGGG I-
Answer:
omg i love grass hopperszszszs
Explanation:
you should give it a mate
pls help asap!!!!!!!
