What is meant by the phrase “a consistent method of measurement"?
A. Things are measured the same way each time.
B. All measurements are in Sl units.
C. Every measurement is exactly the same numerical value.
D. The same person performs all measurements.

Answers

Answer 1
The answer is A for that question
Answer 2

Answer:

A. Things are measured the same way each time.

Explanation:


Related Questions

What types of R groups can exist in amino acids? (Choose all that apply)
Acidic
Non-polar
Basic
Polar

Answers

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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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

Answers

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.

Please help with this question

Answers

A , wetlands act as a sponge sort of for water and slowly releases the water

what is the best "determiner" for identifying if it is a metal?
I need the answer please

Answers

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)

Hydrogen peroxide and potassium permanganate balanced equation

Answers

Answer:

2 KMnO4 + H2O2 → 2 MnO2 + 2 O2 + 2 KOH - Balanced equation

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.

Answers

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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Describe the patterns that can be observed for elements on a Periodic table.

Answers

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.

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

Answers

Answer:

B.) –197.8 kJ

Balanced equation : 2SO(g) + O(g) → 2SO(g)

Given:

SO₂(g) = –296.8 kJ/molSO₃(g) = –395.7 kJ/mol

================================================================

products : 2 ( –296.8 ) + O₂ = -593.6 kJ/mol + Oreactant : 2 (  –395.7 ) = -791.4 kJ/mol

products energy = reactant energy

-593.6 + O₂ = -791.4

O₂ = -791.4 - ( -593.6)

O₂ = –197.8 kJ

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. ​

Answers

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:

the location of volcanosage of rock deposits found near the volcanowhich volcanoes are active and those that aren'ttypes of rocks at these sitesfaults fracture etc.

Note that the map specific to the question is unavailable hence the general response.

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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

Answers

Answer:

the answer is 11.2 seconds. I listened to the other person and picked 33.6 but that was wrong.

Explanation:

took test

i need help from the problem below

Answers

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.

The main purpose of homeostasis is to

A. fight disease-causing organisms.

B. keep internal conditions stable.

C. produce offspring.

D. replicate DNA.

Answers

b. keep internal conditions stable
B. Keep the internal conditions stable.

Algae are microscopic plants that grow in the ocean. Algae must have sunlight, nutrients, and water to survive. They conditions are called _______
for algae.

Answers

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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A footprint of a Tyrannosaurus rex has been found in New Mexico. What type of fossil is this

imprint?

Cast?

Tar seep?

Answers

Answer:CAST!!!!!!!!!!!!!!!

Explanation:

what could have caused the change in the rock layers.

Answers

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 temperature scale is used in gas law calculations.

Answers

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

Answers

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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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.

Answers

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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Devise a three‑step synthesis of the product from 1‑methylcyclohexene

Answers

The three step synthesis of the product from 1-methyl cyclohexane includes the addition of;

C6H5CO3H in CH2Cl2C6H5Li in etherPCC in CH2Cl2.

Three step synthesis from 1 methyl cyclohexene

The three steps reaction involves the use of Reagannts such as;

Reagent 1: C6H5CO3H in CH2Cl2.Reagent 2: C6H5Li in ether.Reagent 3: PCC in CH2Cl2.

Each step in the synthesis is arranged in the order:

Step 1: Epoxide formationStep 2: Nucleophilic additionStep 3: Oxidation of OH group.

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Three step synthesis of the product from 1‑methylcyclohexene includes epoxide formation, nucleophilic attack and oxidation of -OH group.

What is synthesis reaction?

Synthesis reactions are those reactions in which formation of new product takes place by the rearrangement or combination of reactant molecules.

Given question is incomplete so the complete pic of the question is attached below. In the given reaction reagents 1, 2 and 3 are used is C₆H₅CO₃H in CH₂Cl₂, C₆H₅Li in ether and PCC in CH₂Cl₂ respectively.

In the tree step synthesis process, in the first step formation of epoxide takes place, in the second step attack of nucleophile on epoxide takes place and finally in the third step oxidation of hydroxyl group to ketone group takes plce.

Hence 3 step synthesis includes epoxide formation, nucleophilic attack and oxidation of -OH group.

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In a molecule of water (H2O), two hydrogen atoms are each bonded to one oxygen atom. What forms each of the two bonds?

Answers

the two bonds are formed with the help of covalent 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

Answers

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

Does electronegativity affect replacement reactions

Answers

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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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

Answers

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 + H2O

At 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

How is an element called if the number of neutrons exceed the number of protons?.

Answers

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.

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

Answers

Answer:

the correct answer is going to be the school

What is the attraction between water molecules called?.

Answers

It is called Hydrogen bonds

which elements are not likely to bond with other elements? and why

Answers

Answer:

Helium, Neon, Argon, Krypton, Xenon, Radon, and Oganesson

Explanation:

they have full outer shells

Which of the following are duplicated during cell division in a human cell?.

Answers

All cell constituents are duplicated during cell division in a human cell i.e. mitosis and meiosis type of cell division.

What are duplicated during cell division in a human cell?

During mitosis, a cell duplicates all of its internal parts and formed two identical daughter cells. During duplication, all parts have two sets which is equally distributed into two daughter cells in mitosis type of cell division.

While on the other hand, during meiosis, a cell divides into four daughter cells having haploid chromosomes i.e. half number of chromosomes.

So we can conclude that cell constituents are are duplicated during cell division in a human cell.

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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.

Answers

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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A solute is added to water and a portion of the solute remains undissolved. When equilibrium between the dissolved

Answers

Answer:

are you to measures how much solute dissolved with the water or trying to measure how much more water you need the solute to dissolve in ?

The solute is a component of the solution that is added to a solvent to make a solution. when equilibrium is attained then the solution will be saturated.

What is a saturated solution?

A saturated solution is a solution that contains the maximum amount of dissolved solute particles in it and cannot further dissolve solutes added additionally.

When the solute is added and does not get dissolved then the equilibrium between dissolved and undissolved is reached and the solution becomes saturated.

Therefore, the solution is saturated.

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