Answer:
Reaction
Explanation:
A reaction that is spontaneous at low temperature
In a molecule of water (H2O), two hydrogen atoms are each bonded to one oxygen atom. What forms each of the two bonds?
Hurrrryyyyy pls
Based on the experiment below, what was the dependent variable?
Bean
Soil
Bean
Soil
Bean
Soil
Height 20.4 cm
Mass: 159
Height: 45.7 cm
Mass: 6.19
Height: 46.5 cm
Mass: 6.69
LI
Daily water 10 mL
A Daily water 50 mL
B
Daily water 100 mL
С
Answer:
The growth of the plant
Explanation:
The growth of the plant from the bean soil is the dependent variable I believe. This is because it could change depending on many factors for e.g. the amount of light or water
i need help from the problem below
Answer:
I won't say I'm confident with this because I'm not sure if the second one is even correct, but I hope I helped you and didn't make things worse lol.
A 1.775g sample mixture of potassium hydrogen carbonate is decomposed by heating. if the mass loss is 0.275g what is the percentage of khco3
A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.
What is a decomposition reaction?A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
Step 1: Write the balanced equation for the decomposition of KHCO₃.2 KHCO₃(s) → K₂CO₃(s) + CO₂(g) + H₂O(l)
The mass loss of 0.275 g is due to the gaseous CO₂ that escapes the sample.
Step 2: Calculate the mass of KHCO₃ that formed 0.275 g of CO₂.In the balanced equation, the mass ratio of KHCO₃ to CO₂ is 200.24:44.01.
0.275 g CO₂ × 200.24 g KHCO₃/44.01 g CO₂ = 1.25 g KHCO₃
Step 3: Calculate the mass percentage of KHCO₃ in the sample.There are 1.25 g of KHCO₃ in the 1.775 g sample.
%KHCO₃ = 1.25 g/1.775 g × 100% = 70.4%
A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.
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what could have caused the change in the rock layers.
Answer: Changes in the environment
Explanation: the rocks are subjected to extreme heat and pressure, volcanic activities or movements on the Earth's surface.
What is the attraction between water molecules called?.
What temperature scale is used in gas law calculations.
Answer: You used the Kelvin scale.
Explanation: this is because its multiplied by the temperature im not sure.
___ Uses moving air and doesn't pollute the atmosphere.____ uses dead plant matter and burning it releases carbon emissions into the atmosphere.
1. 2.
a. Biomass Energy a. Biomass Energy
b. Solar energy b. Solar energy
c. Hydropower Energy c. Hydropower energy
d. Wind Energy d. Wind Energy
Answer: 1 d. Wind Energy 2. a. Biomass Energy
Explanation:
The use of the moving air has been found to use wind energy, and the dead plants burning is formed with the biomass energy.
What is energy?The energy has been given as the required form to perform a task. The energy can be generated with the pressure and the force of various matters.
Wind energy is produced with the use of the moving air and has been a clean form of energy, i.e. not pollute the region.
The biomass energy has been produced with the use of the dead plants and the matter and releases carbon dioxide.
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During Taylor's second test of a car with a mass of 200 grams, she recorded 11 seconds, 11.4 seconds, and 11.2 seconds for her 3 trials. What would be the mean value she would use to compare with the other cars?
11 seconds
33.6 seconds
11.2 seconds
11.53 seconds
Answer:
the answer is 11.2 seconds. I listened to the other person and picked 33.6 but that was wrong.
Explanation:
took test
why is the non-luminous flame preferred for heating?
Answer:
Because it is the hottest zone
Answer:
the non luminous flames are very hot. little light is produced by non luminous flames.
what is the best "determiner" for identifying if it is a metal?
I need the answer please
Answer:
determiner is a word that introduces a noun or provides information about the quantity of a noun.
Explanation:
The metal cans are recyclable. (determiner before the adjective describing a plural noun to specify which cans)
Metal cans are recyclable. (no determiner because it's optional for plural nouns and noun phrases)
Does electronegativity affect replacement reactions
Elecetronegativity will affect the replacement reactions as it attracts the bonded electrons towards itself.
What is replacement reaction?Replacement reactions are those reactions in which replacement of any one element from any compound is done by any other element.
Electronegativity is the attracting power of any element to hold the bonded electron towards itself so that they will bear a partial negative charge on itself. If in any reaction replacement of anion is required and any compound have more electronegative element which bounded the bonded electron strictly and will not allow the formation of anion then it affects the activity of the reaction.
Hence electronegativity affect the replacement reactions.
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Hydrogen peroxide and potassium permanganate balanced equation
Answer:
2 KMnO4 + H2O2 → 2 MnO2 + 2 O2 + 2 KOH - Balanced equation
The main purpose of homeostasis is to
A. fight disease-causing organisms.
B. keep internal conditions stable.
C. produce offspring.
D. replicate DNA.
What is ∆H for the reaction of sulfur dioxide with oxygen?
2SO2(g) + O2(g) → 2SO3(g)
(∆Hf0 SO2(g) = –296.8 kJ/mol; ∆Hf0 SO3(g) = –395.7 kJ/mol)
A.)–98.9 kJ
B.)–197.8 kJ
C.)1.385 × 103 kJ
D.)197.8 kJ
Answer:
B.) –197.8 kJ
Balanced equation : 2SO₂(g) + O₂(g) → 2SO₃(g)
Given:
SO₂(g) = –296.8 kJ/molSO₃(g) = –395.7 kJ/mol================================================================
products : 2 ( –296.8 ) + O₂ = -593.6 kJ/mol + O₂reactant : 2 ( –395.7 ) = -791.4 kJ/molproducts energy = reactant energy
-593.6 + O₂ = -791.4
O₂ = -791.4 - ( -593.6)
O₂ = –197.8 kJ
Sample data from titration lab:
Amount of analyte; (HCI): 19.54 mL
Amount of titrant: (NaOH): 12.33mL
Molar concentration of NaOH: 0.5 mol
The molarity of the HCl would be:
VM
The numbers I used are probably wrong
Based on the volumes of HCl and NaOH reacted, the molarity of HCl is 0.3 M
What a titration?A titration is a process in volumetric analysis in which the given volume of a substance of known concentration reacting with a volume another solution of unknown concentration is used to determine the unknown concentration of another solution
In the titration given, an unknown concentration of HCl reacts with 0.5 M NaOH solution.
The equation of the reaction is given below:
HCl + NaOH -----> NaCl + H2OAt equivalence point, 1 mole of HCl reacts with 1 moles of NaOH
moles of NaOH = 12.33 × 0.5 = 6.165 moles
moles of HCl = 19.54 × M
From above, moles of HCl = 6.165 moles
Molarity of HCl, M = 6.165/19.54
Molarity of HCl = 0.3 M
Therefore, the molarity of HCl is 0.3 M
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Answer:
0.317
Explanation:
right on edge
What is the role of meteorites in the formation of life?
Answer:
Meteorites are consensually considered to be involved in the origin of life on this Planet for several functions and at different levels: (i) as providers of impact energy during their passage through the atmosphere; (ii) as agents of geodynamics, intended both as starters of the Earth’s tectonics and as activators of local hydrothermal systems upon their fall; (iii) as sources of organic materials, at varying levels of limited complexity; and (iv) as catalysts.
Explanation:
A rigid, non-flexible container of O2 gas is being transported to a hospital. What will most likely happen if the vehicle is left unattended and the temperature of the O2 rises?
A. The pressure will increase and the container will leak or explode. B. The pressure will decrease and the container will leak or explode. C. The pressure will increase, but the particles will condense within the container. D. The pressure will decrease and the container will maintain its current temperature.
If the temperature of the O2 in the container rises as a result of being abandoned for quite some time, the pressure in the container will increase and this may either lead to an explosion or leakage of the gas.
What is the relationship between temperature and pressure of a gas?At constant volume, the pressure of a gas increases with increased temperature as a result of an increase in the average kinetic energy of the gas molecules which increases the collision rate among the molecules.
Thus, if the temperature of a gas in a container increases, the pressure inside the container will also increase. This may lead to the gas leaking from the container or the container may even outrightly explode due to pressure.
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Algae are microscopic plants that grow in the ocean. Algae must have sunlight, nutrients, and water to survive. They conditions are called _______
for algae.
The condition is called phytoplankton because algae are microscopic, need sunlight and nutrient, water to survive.
What is phytoplankton?Phytoplankton refers to microscopic marine algae and they are also called microalgae.They are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow. Most phytoplankton are very buoyant and float in the upper part of the ocean, where sunlight enter the water and they get the sunlight to produce food.
Algae photosynthesized,that is they use sunlight in the presence of chlorophyii and carbondioxide to produce food and oxygen.
Therefore, The condition is called phytoplankton because algae are microscopic, need sunlight and nutrient, water to survive.
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Select all the correct answers.
What do scientists use to communicate extremely small measurements?
unit prefixes
A. base units
B. physical models
C. graduated cylinders
D. scientific notation
D
This is when very large or very small numbers must be written. They come in the format or 5.43 x 10^3 or can be written as 8.26E6. The numbers will vary depending on your number.
Which statement best describes the use of a chemical indicator in a titration? It must be measured to the nearest 0. 01 mL. It must be colored in the acid solution. It must measure pH directly at all pH values. It must change color near the equivalence point.
The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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Draw the structures, including stereochemistry, of the two intermediates and the final product. Use wedge‑and‑dash bonds and hydrogens on chirality centers
The structures of the two intermediates and the final product of the Grubbs catalysis reaction are shown in the attached image, with emphasis on the stereochemistry of the two intermediates and the end product.
What are intermediates?Intermediates are those species which are formed during the process of any chemical reaction which in turn finally converts into products.
Stereochemistry is a discipline of chemistry that studies the three-dimensional structure of molecules and how it influences their physical and chemical properties.
According to the question it is discussing about the Grubbs catalysis reaction which is a transition metal carbene series complex in which mixture of two optical active compounds are obtained which are the intermediates which finally gives product after reduction.
Hence the required structures are shown in the attached image.
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Describe the patterns that can be observed for elements on a Periodic table.
Answer:
mark brainliestbrainliestbrainliest.
Explanation:
The periodic table is an arrangement of the elements in order of increasing atomic number. Elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods.
Review the map that shows earthquake zones as yellow lines and active volcanoes as red dots. what pattern can you determine about the focation of the volcanoes and the earthquake zones? also explain why the earthquake zones are long lines on the globe. write 3 to 5 sentences.
A map that shows the location of volcanoes is called a Geologic Map. This kind of map contains information about the geological history and condition of volcanic sites.
What do Geologic Maps indicate?
Geologic maps indicate the following:
Note that the map specific to the question is unavailable hence the general response.
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Jesse is riding the bus home from school. He is moving away at 30 miles per hour. From which reference point would this description be correct? A. Jesse's home B. the driver of the bus C. the school D. another student on the bus
Answer:
the correct answer is going to be the school
A footprint of a Tyrannosaurus rex has been found in New Mexico. What type of fossil is this
imprint?
Cast?
Tar seep?
Answer:CAST!!!!!!!!!!!!!!!
Explanation:
What types of R groups can exist in amino acids? (Choose all that apply)
Acidic
Non-polar
Basic
Polar
Answer:
acidic,non polar,basic
Explanation:
that’s the ones I put and I got a 100% on my test just now
The types of R groups that can exist in amino acids include acidic, non-polar, basic, and polar groups.
1. Acidic R groups: These groups have a negative charge and can donate a proton (H+). An example of an amino acid with an acidic R group is aspartic acid (Asp) or glutamic acid (Glu).
2. Non-polar R groups: These groups are hydrophobic and do not have a charge. They are composed mainly of carbon and hydrogen atoms. Examples of amino acids with non-polar R groups include alanine (Ala), valine (Val), and phenylalanine (Phe).
3. Basic R groups: These groups have a positive charge and can accept a proton. An example of an amino acid with a basic R group is lysine (Lys) or arginine (Arg).
4. Polar R groups: These groups are hydrophilic and have a partial charge. They can form hydrogen bonds with other polar molecules. Examples of amino acids with polar R groups include serine (Ser), threonine (Thr), and asparagine (Asn).
Thus, types of R groups that can exist in amino acids include acidic, non-polar, basic, and polar groups.
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3. Explain why an aluminum ion (A13+) is smaller than a sodium ion (Na+).
Answer:
This question is hard :( I dont know im so sorry
Explanation:
Answer these questions based on 234. 04360 as the atomic mass of thorium-234. The masses for the subatomic particles are given. Round the mass defect to the 5th decimal place. Mass of a proton: 1. 00728 amu mass of a neutron: 1. 00866 amu How many protons does Thorium have? How many neutrons does Thorium-234 have? Calculate the mass defect for the isotope thorium-234 = amu.
The mass defect for the isotope thorium-234 if given mass is 234.04360 amu is 1.85864 amu.
How do we calculate atomic mass?Atomic mass (A) of any atom will be calculated as:
A = mass of protons + mass of neutrons
In the Thorium-234:
Number of protons = 90
Number of neutrons = 144
Mass of one proton = 1.00728 amu
Mass of one neutron = 1.00866 amu
Mass of thorium-234 = 90(1.00728) + 144(1.00866)
Mass of thorium-234 = 90.6552 + 145.24704 = 235.90224 amu
Given mass of thorium-234 = 234.04360 amu
Mass defect = 235.90224 - 234.04360 = 1.85864 amu
Hence required value is 1.85864 amu.
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How is an element called if the number of neutrons exceed the number of protons?.
Answer:
In a heavier nucleus, the repulsive force between the protons is very high. For stability, the nuclear force must dominate this electrostatic repulsive force. This is possible if the number of neutrons is greater than number of protons.