Answer:
none of the liquid is purple
Explain the difference between accuracy and precision.
Answer:
The difference between accuracy and precision is both precision and accuracy are two ways of how scientists think about error. However, accuracy refers to or meaning to how close a measurement is to the true or accepted value. On the other hand, precision refers to or meaning to how close measurements of the same item are to each othe .... But scientists use the best quality of scientific observations and are both accurate and precise.
The atomic mass of an element can change as the number of________ changes.
(Options:)
a. neutrons
b. electrons
c. protons
Answer: a: neutrons but it might be b
Explanation:
i learn this in 7 grade and it was a long time so i might be wrong
Write for empiricalformula
Fe2+, cr4+, cl-, O2-
Answer:
{eq}Fe^{2+} {/eq} and {eq}I^- {/eq} forms {eq}FeI_2 {/eq}
{eq}Fe^{2+} {/eq} and {eq}S^{2-} {/eq} forms {eq}FeS {/eq}
{eq}Cr^{4+} {/eq} and...
Explanation:
Empirical formula:
The empirical formula gives the simple ratio of the different types of atoms in a compound. It is different from the molecular formula, which gives the exact number of each type of atom in a compound.
How many mass would be contained in 0.01mol of NaOH
Answer:
∴ No. of atoms in 0.01 moles of NaOH = 6.02×10
23
×0.01=6.02×10
21
Convert 6.800 x 10^-3 km to cm.
Answer:
680 centimeters
Explanation:
because it is
explain using the kinetic molecular theory, why a liquid becomes a solid when the temperature is decreased.
A liquid becomes a solid if its temperature decreases. In general a gas becomes a liquid or solid when it is cooled. Particles have less energy and therefore move closer together so that the attractive forces become stronger, and the gas becomes a liquid or a solid.
Attractive forces between particles: Very strong ...
Spaces between particles: Very little space bet...
Energy and movement of particles: Low energy - ...
A spider catches and eats a caterpillar that depends on plant leaves for food.
Draw a food chain that tracks how the sun's energy gets to the spider.
Answer: The caterpillar stage of the invasive winter moth ( Operophtera brumato) eats young, tender leaves, sometimes before the leaves even get a chance to emerge from the bud. Energy from the Sun is transformed into chemical energy. 1. , which is passed along in a food chain
Explanation: Can't draw on here, hope this help u tho
What is the percent yield if 23.1 grams of FeCl3 (162.2 g/mol) is created from 10.61 grams of iron (55.85 g/mol) in the following reaction Report your answer with three significant
figures
2 Fe + 3Cl2 + 2 FeCl3
The percentage yield of the reaction if 23.1 grams of FeCl₃ is created by 10.61g of Fe is 74.9 %.
What is percent yield?Percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100.
As per the given balanced reaction, one mole or 55.85 g of Fe is needed to produce 1 mole or 162.2 g of FeCl₃.
Then theoretically, the mass of FeCl₃ which can be produced by 10.61 g of Fe is calculated as follows:
= (10.61 × 162.2) / 55.85
=30.81 g
This is the theoretical yield.
The actual yield is given 23.1. Now the percentage yield is calculated as follows:
Percentage yield = (Actual yield/ heretical yield)×100
= (23.1/30.81)×100
= 74.9 %.
Hence, the percentage yield of the reaction is 74.9 %.
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WILL MARK BRAINLIEST
What occurs when energy is added or removed from an object or a system by an outside agent?
Potential Energy
Kinetic Energy
Elastic Potential Energy
Thermal Energy
Work
Answer:
Its Thermal Energy
Explanation:
Please help me with this question it’s really confusing and I need it done in 8 minutes I’ll give you extra credit :))
Answer:
pls say the question
Answer:
i cant see anything maybe make the picture bigger,
Explanation: maybe thall help
Layla is helping to clean car parts with a single chemical, but it isn't working. She washes her hands and tries a different chemical, which also does not work. She resumes with the first chemical without washing her hands. This time, the cleaning process works, but she begins to get dizzy and nauseated. What can Layla infer about the possible reason for her illness?
It is an acute effect of two toxins with a synergistic relationship.
It is a chronic effect of the second toxin she used to clean the parts.
The first chemical has an antagonistic relationship with the second.
The second chemical causes acute affects, and the first causes chronic affects.
Layla is helping to clean car parts with a single chemical, but it is not working. She washes her hands and tries a different chemical, which also does not work. She resumes with the first chemical without washing her hands. This time, the cleaning process works, but she begins to get dizzy and nauseated.
The first chemical is possibly toxic and may have caused Layla to become dizzy and nauseated when she resumed cleaning car parts without washing her hands after trying the second chemical. Layla could have accidentally ingested or absorbed some of the first chemical when she touched her mouth or rubbed her eyes while still contaminated with the chemical.A chronic effect is an effect that occurs as a result of exposure to a substance or substances over an extended period. The effect may not become evident until long after the exposure has occurred and may persist even after the exposure has ended. On the other hand, an acute effect is an effect that occurs soon after exposure to a substance or substances and usually lasts for a short period.The symptoms Layla experienced after resuming cleaning car parts with the first chemical are consistent with acute toxicity, which may cause symptoms such as dizziness, nausea, headache, skin irritation, and even death. Therefore, it is possible that the first chemical causes acute effects rather than chronic effects. However, the second chemical, which Layla washed her hands with, may also have toxic effects, but not necessarily acute ones.In conclusion, the fact that Layla experienced symptoms of dizziness and nausea after resuming cleaning car parts with the first chemical without washing her hands indicates that the chemical could be toxic and may have caused acute effects.For such more question on nauseated
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Which of following substances would have the most attraction between its particles sliver ( a solid that melts at 960C) ethanol ( a liquid at room temperature) oxygen ( a gas at room temperature) HDPE (a solid that melts at 110)
Answer:
I have asked question in my profile please tell me the answer
Explanation:
I dont know the answer sorry
Which of the following gives the correct numbers of protons, neutrons, and
electrons, respectively, in a neutral atom of Potassium?
A) 19 protons, 20 neutrons, 19 electrons
B) 39 protons, 20 neutrons, 39 electrons
C) 20 protons, 19 neutrons, 19 electrons
D) 39 protons, 20 neutrons, 19 electrons
Answer:
A
Explanation:
because in neutral proton equals to electron
The correct option is A. Potassium has 19 protons, 20 neutrons, and 19 electrons.
What is potassium?
Potassium is an element. It has protons and electrons. potassium has a nucleus. The nucleus contains protons and neutrons. Electrons revolve around the nucleus.
Proton is a positively charged atom and an electron is negatively charged and revolves around the atom. Neutron is neutral in charge.
The atomic number of potassium is 19. So it has 19 protons and 20 neutrons and 19 electrons.
Therefore, The correct option is A. Potassium has 19 protons, 20 neutrons, and 19 electrons.
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QUESTIONS
71. The temperature scale used in everyday life in most of
the world except the United States is the
scale.
A lung holding a residual air volume of 1.50 L at 36 ºC has a pressure of 1.00 atm. How many moles of residual air is the lung holding? R = 0.0821 L.atm/mol.K.
Answer:
0.05909882564 mol
Explanation:
PV=nRT
n = 1.00atm*1.50L /(0.0821L.atm/mol.k * 309.15 k)
= 0.05909882564 mol
the structure that houses dna
The nucleus (plural, nuclei) houses the cell's genetic material, or DNA, and is also the site of synthesis for ribosomes, the cellular machines that assemble proteins. Inside the nucleus, chromatin (DNA wrapped around proteins, described further below) is stored in a gel-like substance called nucleoplasm.
50 Points Help Me ASAP
change the following to the appropriate unit
1. 9.63 x 10–2 m ==> nm
2. 6.02 x 103 ks ==> s
3. 8.9 x 108 microgram ==> centigram
4. 4.12 x 10–4 Mg ==> g
5. 7.33 x 10 -2 TL ==> dL
6. 0.73 kL => L
7. 5.93 cm3 => m3
8. 498.82 cg => mg
[tex]\\ \sf\longmapsto 9.63\times 10^{-2}m=9.63\times 10^{-2}\times 10^{-9}m=0.0963\times 10^{-9}m=0.0963nm[/tex]
[tex]\\ \sf\longmapsto 6.02\times 10^3ks=6.03\times 10^6s[/tex]
[tex]\\ \sf\longmapsto 8.9\times 10^8\mu g=8.9\times 10^4cg[/tex]
[tex]\\ \sf\longmapsto 4.12\times 10^{-4}Mg=4.12\times 10^{-1}g=0.412g[/tex]
[tex]\\ \sf\longmapsto 7.33\times 10^{-2}Tl=7.33\times 10dL=73.3dL[/tex]
[tex]\\ \sf\longmapsto 0.73kL=0.73(1000)L=730L[/tex]
[tex]\\ \sf\longmapsto 5.93cm^3=0.00000593m^3[/tex]
Done!
What is 188.5°F in Celsius?
Answer:
That would be 86.944 Celsius
Explanation:
(188.5°F − 32) × 5/9 = 86.944°C
Answer: [tex]86.944444[/tex]°C
Explanation: (188.5°F − 32) × 5/9 = 86.944°C
What is a physical change and a chemical change
Answer:
A physical change --> is the change in appearance or form Example --> ice melting.
A chemical change --> is the change in chemical composition. Example --> rust
Additionally, physical changes can be reversible (water melting or freezing), while chemical changes can't. Rust cannot be reversed.
Please help me: What mass of silver nitrate in water would need to be added to 5 g
of sodium chloride to ensure complete precipitation of the chloride?
Answer:
What are the 26 states of matter?
Bose–Einstein condensate.
Fermionic condensate.
Degenerate matter.
Quantum Hall.
Rydberg matter.
Rydberg polaron.
Strange matter.
Superfluid
Which pure substance can be classified as an element?
O
NO
Naci
H.SO
on edgnuity
1.Which evidence did Wegener use to develop the theory of continental drift?
There is no evidence of glaciers anywhere in South America.
The climate of Siberia has always been the same.
Similar fossils were found on different continents.
The Rocky Mountains are taller than the Appalachian Mountains.
2.According to the theory of continental drift, which option indicates the order of how the continents changed positions?
B, C, A
C, B, A
A, B, C
C, A, B
3. The theory of continental drift proposes that the Earth's continents may have once been united as a supercontinent but have drifted apart over time.
What was the name of the supercontinent?
Americas
Gondwanaland
Laurasia
Pangaea
4.Part of Weneger's theory of continental drift was that the original supercontinent broke into two pieces.
What were these two land masses called?
Laurasia and Pangaea
Gondwanaland and Pangaea
Laurasia and Gondwanaland
Pangaea and Eurasia
5.
Over time Pangaea broke apart to form other continents.
Which group of modern-day continents composed Gondwanaland?
North America and South America
North America, Europe, and most of Asia
Africa, South America, Antarctica, Australia, and the subcontinent of India
Antarctica, South America, and Europe
Answer:
1. the second one
2. we need to know what the letters go to like is there a picture?
3. the first one
4.the last one
5.the third one
Explanation:
Is Fluorine covalent, ionic or hydrate?
what are the limitations of Refractometer?
Answer:
Tedious calibration No instrument protocol Operator dependent readings( limited accuracy) Long and difficult thermosetting (water bath is required after each experiment)
Explanation:
hope it helps you
brainliest plz if it helped
Which of the following must be true in order for a reaction to have no excess reactants?
A) It must be a double-replacement reaction.
B) Reactants must be present in equal amounts.
C) Reactants must be present in the exact molar ratios in the balanced chemical equation.
D) It must occur at a high temperature.
Answer:
C) Reactants must be present in the exact molar ratios in the balanced chemical equations.
Explanation:
Consider the balanced chemical reaction below. What is the maximum number of
grams of Ag that can be produced if 0.570 mol of Zn and 0.691 mol of Ag2O
react?
Zn(s) + Ag2O(s) → ZnO(s) + 2 Ag(s)
Answer:
121.98
Explanation:
As you see the reaction, stoichiometry for both Zn and Ag2O is one so for calculating, we choose the one with less mol. Then in product we have 1.14 mol Ag. As the atomic mass of Ag is 107, we have 121.98 grams of Ag
Hope u get it
How does a Camel prevent the loss of water from their body?
Camels lose less water through their urine and feces than many other mammals. Their kidneys concentrate water heavily, leading to salty urine. The intestines also reabsorb water from intestinal material as it is digested, so dry feces are produced.
A d6 electron configuration will typically have an overall spin of
Answer: 2
Explanation:
does food passes through liver, pancreas and appendix?
yes or no?
PLZ ANSWER ASAP PLZZZZZZZZZZZ
If the molecules in the above illustration react to form N2O4 according to the equation N2 + 2 O2 =N2O4 , the limiting reagent is , the number of N2O4 molecules formed is , and the number of molecules in excess is
Answer:
The limiting reagent is O2. The theoretical yield of N2O4 is 6 moles.
The limiting reactant is nitrogen.
In a chemical reaction, two or more species combine to form products. The amount of all the reactants in the system are usually not the same. The specie that is present in the least amount is called the limiting reactant. The reactant that is present in the greatest amount is called the reactant in excess.
Looking at the image, there are six oxygen molecules and two nitrogen molecules hence nitrogen is the limiting reactant and oxygen is the reactant in excess.
Since the equation of the reaction is; 2N2 + 4O2 --->2N2O4, it follows that there are two excess oxygen molecules that are left unreacted. Two N2O4 molecules are formed.
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Missing parts:
The illustration to the left represents a mixture of nitrogen (blue) and oxygen (red) molecules.
If the molecules in the above illustration react to form N2O4 according to the equation N2 + 2O2 N2O4
the limiting reagent is___?___
the number of N2O4 molecules formed is___?___
the number of___?___molecules in excess is___?___