Answer:
C. 11 moles of N2O
Explanation:
A. CO2 exists as a molecular compound. The number of atoms present = 1 atom of Carbon and 2 atoms oxygen = 3 atoms * 9 = 18 atoms
B. Xe exists as an atom. Number of atoms present = 10 * 1 atom = 10 atoms
C. N20 contains 3 atoms; 2 atoms of Nitrogen and 1 atom of oxygen.
Number of atoms present = 3 * 11 = 33 atoms
D. CO contains 2 atoms, 1 each of carbon and oxygen.
Number of atoms present = 12 * 2 = 24 atoms
[FW.04]“A family can save over 50,000 gallons of water per year by recycling graywater." The most reliable source of this
information is a
plumber
salesman
scientific website
O journalist
Answer:
scientific website
Explanation:
What is the result of increasing the volume of a gas?
Answer:rising temperature
Explanation:
V is directly propotional to the temperature and inversly to the pressure.
Answer:
this is cause due to increase of pressure
Which of the following is a universal solvent?
H2O
H2O2
C2H5OH
HCl
Answer:
H₂O
Explanation:
H₂O is the chemical formula of water.
Water is regarded as a "universal solvent". The reason behind this is the property of the water. Water is a solvent that can dissolve a variety of substances in itself. Any other liquid cannot dissolve the number of substances that the solvent water can. The reason behind being the universal solvent is the chemical composition and physical characteristics of water.
Use the information provided below to answer the
questions.
The isotope lead-208 (208Pb):
g/mol
The isotope strontium-87 (87sr):
g/mol
DONE
Answer:
208 g/mol and 87 g/mol
Explanation:
Number of protons = 82
Atomic mass = 126 + 82 = 208 g/mol
For ^{87}Sr
Number of neutrons = 49
Number of protons = 38
Atomic Mass = 49 + 38 = 87 g/mol
Answer 208 and 87
Explanation:
A box with a volume of 22.4 L contains 10 mol of nitrogen and 2.0 mol of
hydrogen at 0°C. Which of the following statements is true?
Answer:
rises to an altitude where the pressure is 27.5 and the temperature is 10°C, its volume there is.
Explanation:hope it helpsThe major cause of a warmer planet
comes from?
Answer:
It is caused by increased concentrations of greenhouse gases in the atmosphere, mainly from human activities such as burning fossil fuels, deforestation and farming.
Explanation:
hope it helps : )
How many orbitals does fluorine contain
Based on their electronegativities, you would expect ____ elements to pull on electrons more strongly than ______ elements.
Answer:
I interpret the answers as being nonmetallic and metallic.
Explanation:
Nonmetals are in groups 14 - 18. Electronegativity is referred to as the want to attract electrons to an atom. Noble gases (group 18) have eight valence electrons in their outer subshells and are therefore atomically stable. Elements with only 7 valence electrons are very electronegative because they desire to obtain an electron to reach stability more than a group 2 element would (they are more likely to drop electrons by giving away in order to reach atomic stability of a group 18 element). This coincides with electron configuration, which is a very lengthy topic to cover. You can conduct more research if you would need it.
Why does chemical safety remain a concern today?
A. Chemists really don't know what to do with dangerous chemicals.
B. Chemists are constantly learning more about what makes
chemicals dangerous.
C. Chemists still have many older, existing chemicals that are
dangerous.
D. Chemists don't think about the safety of the chemicals they use.
Answer: B. Chemists are constantly learning more about what makes chemicals dangerous.
Explanation: The safety of chemicals still remains of utmost importance as chemist haven't relented in their strive and curiousness at knowing the compounds, mixtures and elements which makes chemicals dangerous in other to minimize or mitigate the risk of exposure to this chemicals during usage. Chemicals are things we cannot do without as they constitute a lot to the human race in terms of Energy and health. Due to this immense contribution, the safety of chemicals will remain of great priority to chemists.
Can someone help me I’m stuck
Answer:
the distribution of their components
Explanation:
Homogeneous mixtures = cannot be separated
Heterogeneous mixtures = can be separated
You can identify these mixtures by looking at the distributions of their particles. Therefore, the third answer is correct.
What are the products in a neutralization reaction A. Two elements B.an acid and a base C. An element and a compound D. A salt and water
D. Salt and water
Explanation:
Acid + Alkali -> Salt + water
Explanation:
the following correct choices would include:
Option C. Dissociate in water .
Option D. Electrolytes .
Option F. Are a product of a neutralizing reaction.
Sodium chloride is the scientific name for basic salt, table salt, or halite. In which is a synthetic compound with the equation NaCl.
Hope I could help! :)
Which question is the best scientific question?
Why does a duck eat?
Does a duck like what it eats?
Should people eat duck?
What does a duck eat most often?
Answer: What does a duck eat most often?
Option D is the best scientific question
Hope it helps....
What does a duck eat most often, this question is the best scientific question. A scientific question is one that may be directly investigated using an experiment or set of data in the field of science.
What is the scientific question ?A scientific question is one that may generate a hypothesis and assist in determining the cause of an observation. A sound scientific hypothesis must be verifiable and quantifiable. You can do an experiment to get the solution.
Then there are the inquiries that seek explanations for why anything exists, why something is the way it is, or why we are here. These inquiries constitute the first type. These are what some refer to as "ultimate" questions that go beyond the purview of science.
Thus, option D is correct.
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What type of bond does butter have?
Answer: Covalent Double Bond
Explanation:
Butter is made from saturated fat, which is made from hydrocarbon molecules. A hydrocarbon is a compound containing only carbon and hydrogen bonds. Both of those are covalent bonds.
Which energy transformation occurs in an electric motor?
A. electrical to kinetic
B. electrical to thermal
C. potential to kinetic
D. kinetic to electrical
10. How do substances change after a chemical reaction?
cal
A They lose mass.
B Their atoms are rearranged.
C Their atoms lose electrons.
D They change phase.
Answer:
I'm pretty sure the answer is B
Explanation:
Because when a chemical reaction takes place the substances atoms rearrange and turn into a different substance.
The most common source of infectious diseases in water supplies is _______. a. algal blooms b. sewage c. surface runoff d. none of the above Please select the best answer from the choices provided A B C D
Answer:
The correct option is B
b) sewage
Explanation:
Sewage reffers to domestic or municipal wastewater,it is a type of wastewater which is released to the environment by a community of people.It could be industrial effluents, or stormwater from streets. It can be identified by the amount of chemical and toxic constituents, the status of bacteria present.
There is release of sewage into streams and rivers around the world today even in an untreated form, as a result of these the respiration as well as the available Oxygen is consumed because of the organic carbon present in the untreated sewage which makes the river toxic and get people infected with diseases if consumed.
Sewage is made up of different harmful microbes, human can contact diseases from these microorganisms when bathing with the water or make use of it to cook.
Almost all characteristics of a star are determined by its
position in its galaxy
closeness to other stars
initial mass
Which stage comes first in the life cycle of a high-mass star?
red giant
white dwarf
protostar
Elements in the same group have _____. the same number of electron shells the same atomic number similar chemical properties the same number of electrons
Answer:
Similar chemical properties
Thin Iron metal will burn in oxygen to form iron (III) oxide. Write a balanced equation for this synthesis reaction. Label the limiting and excess reactants? How much mass of the Iron (III) oxide will form from 10.0 grams of each of the reactants? What is amount of the excess reagent will remain at the completion of this reaction? Show your work.
Answer:
14.25 g of Fe2O3
33.26 g of Fe2O3
0.045 moles of excess reagent.
Explanation:
The equation for the reaction is shown below, remember that noting the correct chemical reaction equation is the first step towards solving the problem.
4Fe (s) + 3O2 (g) ==> 2 Fe2O3 (s)
Since the oxygen is abundant in air, oxygen is the reactant in excess while the iron is the limiting reactant. Remember that only a thin iron metal burns according to the question.
To double check our assumption above, the reactant that gives the least mass of product is the limiting reactant.
Using iron;
If 224 g of iron yields 319.38 g of Fe2O3
10g of iron will yield 10 × 319.38/224 = 14.25 g of Fe2O3
Using oxygen
96 g of oxygen yields 319.38 g of Fe2O3
10 g of oxygen will yield 10 × 319.38/96 = 33.26 g of Fe2O3
Since iron is the limiting reagent, number of moles in 10g of iron = 10g/56gmol-1 = 0.18 moles
From the reaction equation
4 moles of iron reacts with 3 moles of oxygen
0.18 moles of iron will react with 0.18 ×3/4 = 0.135 moles of oxygen
Amount of excess reagent remaining; 0.18- 0.135 = 0.045 moles of excess reagent.
A metal X loses 2 electrons and a non-metal Y gains 1 electron. Show the electron dot structure of compound formed between them. Is it ionic or covalent? Does it have high or low melting point? Will it conduct electricity in solid state or in aqueous solution and why? Will it be soluble in water?
Answer:
The compound is ionic
The compound has a high melting point
The compound will conduct electricity in aqueous solution
The compound will be soluble in water
Explanation:
Now, let us consider the nature of the compound formed when a metal X looses two electrons and a non metal Y accepts one electron.
The compound formed must be ionic in nature with a formula XY2. Ionic compounds are formed by transfer of electrons from metals to nonmetals.
The ionic substance formed is always soluble in water with a high melting point. Usually, ionic solids do not conduct electricity in the solid state because the charge carriers (ions) are tightly bound in the crystal structure while in the solid state. In aqueous solution, the ions are relatively free hence ionic substances conduct electricity in aqueous solution.
How does increasing temperature increase the number of reactions?
Answer:
Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction
Explanation:
Oil and fat containing food items are flushed with nitrogen. Why?
Answer:
oil and fat containing food terms items flushed with nitrogen because nitrogen acts as an antioxidant and it prevents them from being oxidised.
Explanation:
Nitrogen is an inert gas that is flushed in food items as it does not react with food items and removes all the oxygen present in food. Oxygen present in food products is then rancid by the presence of oils and fats. Nitrogen is chemically non-reactive with oils and fats and therefore preserves oily food products.
hope this helped!
Answer:
Nitrogen is used to flush the foods because it does not interact with the foods and the oils and fats within them.
Explanation:
Nitrogen serves as an antioxidant to remove oxygen from the food and prevent it from being oxidized. Typically, it is also used to keep the fats and oils from binding with it and ruining the integrity and structure of the food.
What is the difference between rain and mist?
A. Rain forms from clouds, while mist forms at Earth’s surface.
B. Rain is warmer than mist.
C. Raindrops are larger than droplets of mist.
D. Raindrops fall straight down while mist moves sideways.
when sodium reacts with gold (III) chloride, gold metal and sodium chloride are formed. Balanced the equation and classify it
The reaction between sodium and gold III chloride is a single replacement since sodium is ahead of gold in the electrochemical series
What is a chemical reaction?A chemical reaction has to do with an interaction between two or more reactants to yield products.
Now we know that the reaction between sodium and gold III chloride is a single replacement since sodium is ahead of gold in the electrochemical series hence; 3Na + AuCl3 ----->3NaCl + Au
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What is the charge of a potassium (K) ion?
The Periodic Table
A. -1
B. +1
C. +4
D. -4
Answer:
B, the charge is +1
Explanation:
science
Answer:
B. +1
Explanation:
What structural adaptation of the A. cristatus lizard helps them in the water?
A: strong claws
B: flattened tail
C: large size
D: fishing in herds
The structural adaptation of the A. cristatus lizard that helps them in the water is a flattened tail, option B. The flattened tail acts as a powerful swimming paddle that enables the lizard to move through the water with ease.
What is structural adaptation ?Structural adaptation refers to physical changes in an organism's body structure that enable it to better survive and thrive in its environment. These adaptations can be anatomical, physiological, or behavioral, and are typically the result of natural selection over many generations.
The flattened tail adaptation is especially useful for the A. cristatus lizard, which is a semi-aquatic species that spends much of its time in and around water.
While strong claws may help the lizard climb trees or navigate rough terrain on land, they are not specifically adapted for aquatic environments.
Large size and fishing in herds are also not adaptations that aid in swimming or other aquatic activities. Hence, option B is correct.
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What thoughts and feelings have you had about the protests that
have taken place?
Answer: It’s good that there are protests but the looting and destruction needs to stop
Explanation:
A 52-gram sample of water that has an initial temperature of 10.0 °C absorbs 4,130 joules. If the specific heat of water is 4.184 J/(g °C), what is the final temperature of the water?
Answer:
The final temperature of the water is 28.98 degree Celsius.
Explanation:
It is given that,
Mass of sample of water, m = 52 grams
Initial temperature, [tex]T_i=10^{\circ}C[/tex]
Heat absorbed, [tex]Q=4,130\ J[/tex]
The specific heat of water is [tex]4.184\ J/(g^{\circ} C)[/tex]
We need to find the final temperature of the water. The heat absorbed is given by the formula as follows :
[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{4130}{52\times 4.184 }+10\\\\T_f=28.98^{\circ} C[/tex]
So, the final temperature of the water is 28.98 degree Celsius.
Answer:
29 degree Celsius
Explanation:
If anyone confused this is the choices:
11 °C
19 °C
29 °C
Estimate 28.98 to 29 for the answer
HEEEELLLLPPPP PLS!!! ITS A COLLEGE PLACEMENT TEST
Calculate the mass percentage of nitrogen in chromium (III) nitrate. Round your answer to the nearest percentage.
Answer:
The percent composition for nitrogen in chromium(III) nitrate is 6%.
Can someone help me with these chemistry questions? I will name brainliest and this is worth 50 points
What ion is responsible for acids?
How are alkalis different from bases?
Name an alkali.
What is the general equation for a reaction between an acid and a base?
What is oxidation?
Metal + Acid Salt + ????
If an atom lost 3 electrons, what charge would it have?
Why do metals conduct electricity?
What is a positive test for hydrogen?
Answer:
H + ions are for acids
there is one. Essentially a base is a chemical which will react with an acid to form a salt and water only. An alkali is a water-soluble base. Insoluble bases, which are not called alkalis, are all metal oxides and insoluble metal hydroxides.
HCl(aq) + Na(OH)(aq) → H2O + NaCl this is what i know
hey i remembered y metals conduct electricity
Metals contain free moving delocalized electrons. When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side. Metal is a good conduction of heat.
Explanation:
those are what i know hope it helps
Answer:
H + ions
alkalis are also bases but the difference between them is,alkalis are soluble in water but the bases doesn't. Bases are substances that react with acids and neutralise them.
Potassium hydroxide, KOH.
When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
the process or result of oxidizing or being oxidized.
Hydrogen
Metals are excellent conductors because the atoms in a metal form a matrix through which their outer electrons can move freely. Instead of orbiting their respective metal atoms, they form a "sea" of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions .
Positive diagnosis for a lactulose SIBO breath test – typically positive if the patient produces approximately 20 ppm of hydrogen and/or methane within the first 60–90 minutes (indicates bacteria in the small intestine), followed by a much larger peak (colonic response). This is also known as a biphasic pattern.
