Answer:
D. The nucleus comprises over 99% of the atom's mass.
Explanation:
Which of the following best describes the relationship between mass and subatomic particles?
A. The mass of an electron is equal to that of a neutron. FALSE. The mass of an electron is ≈1/1,840 of that of a neutron.
B. Atomic mass is the total number of protons and electrons. FALSE. Atomic mass is the total number of protons and neutrons.
C. A neutron has 0.05% more mass than an electron. FALSE. A neutron has 0.05% more mass than a proton.
D. The nucleus comprises over 99% of the atom's mass. TRUE. The nucleus comprises protons and neutrons.
Which chemistry is used to create energy? *
Nuclear Chemistry
Organic Chemistry
Analytical Chemistry
Biochemistry
Answer:
*biochemistry* is the answer
Answer:
No the real answer is nuclear chemistry
Explanation:
Which of the following is a property of a pure substance?
It consists of different types of compounds.
It may have substances in different states of matter.
The ratio of the particles that make it up is fixed.
Its components can be separated by employing physical methods.
Answer:
The ratio of the particles that make it up is fixed
Explanation:
Which image below shows the correct way to convert 0.828 kilometers to meters
Explain the rationale and what happens to the units.
Answer:
A
Explanation:
Because you need to multiply the length value by 1000
You are concerned about the rate of death in catfish your aquaculture operation in tanks that have a high amount of algae growth. You collect some of the algae and send it to the university to have it identified. You find that it is a blue-green alga called Anabaena. Anabaena is known to be toxic to fish. You design an experiment to test how much of the algae the fish can stand before they die. You obtain 6 large aquariums (all the same size) and fill them with water taken from a healthy catfish pond at your operation. You put each aquarium on the same bench in the laboratory, where the light and temperature values are identical. You let the water stand for one day before starting the experiment. In aquarium 1, you add 2 grams of algae and no fish. In aquarium 2, you add 20 small catfish and no algae. Aquarium 3 gets 20 catfish and 2 grams of algae, #4 gets 20 catfish and 4 grams of algae, #5 gets 20 catfish and 8 grams of algae, and aquarium #6 gets 20 catfish and 16 grams of algae. The aeration rate of each aquarium is identical. You make two observations at the same time each day for two weeks. You keep track of the numbers of fish in each tank that die. What is the problem? What is your hypothesis? What is the independent variable? What is the dependent variable?
Answer:
Problem: How does the amount of algae (anabaena) affect or cause the number/rate of catfish death
Hypothesis: IF there is a high amount of algae growth, THEN the rate at which catfishes die increases.
Independent variable: Amount in grams of algae
Dependent variable: Number of catfishes that die.
Explanation:
A scientific experiment starts with an observed problem or a question which can be tested. In this experiment, the rate of death of catfish in an aquaculture due to the high amount of algae (anabaena) growth is observed, hence, it is the problem. It will be asked as a question: HOW DOES THE AMOUNT OF ALGAE IN A TANK CAUSE THE RATE AT WHICH CATFISHES DIE.
Formualting an Hypothesis is the next step of a scientific method. Hypothesis is a testable explantation or suggested solution to the observed problem or asked question. A hypothesis of this experiment can be: IF THERE IS A HIGH AMOUNT OF ALGAE GROWTH, THEN THE RATE AT WHICH CATFISH DIE INCREASES.
Next is to test the hypothesis by conducting an experiment. In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a response. In this experiment, the independent variable is the AMOUNT IN GRAMS OF ALGAE ADDED TO EACH AQUARIUM.
On the other hand, the dependent variable is the variable being tested or measured in an experiment. In this experiment, the dependent variable is the NUMBER OF CATFISH THAT DIE.
2. A golden-colored cube is handed to you. The person wants you to buy it for
$100, saying that it's a gold nugget. You pull out your old geology text and
look up gold in the mineral table, and read that its density is 19.3 g/cm3. You
measure the cube and find that it is 2 cm on each side, and has a mass of 40g.
What is its density? Is it gold? Should you buy it?
Answer:
Volume of the cube is 2*2*2 = 8cm^3.
Divide the weight (40g) over the volume (8cm^3).
Density is 5g/cm^3. Definitely not gold.
Explanation:
Yes, the given golden-colored cube is gold .The density of gold is 32 gm/cm³ and we must buy it.
What do you mean by density?Density is a mass of a unit volume of a material substance.
The formula for density is d = M/V, where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
To calculate density-
given
mass=40gm
side of cube =2cm
therefore, volume=(side)³
=8cm³
density=?
density=mass/volume
density=40/8
density=5 gm/cm³
The handed golden-colored cube is gold with its density 5gm/cm³ and hence we must buy it.
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. The freezing point of an aqueous solution containing a nonelectrolyte solute is – 2.79 °C. What is the boiling point of this solution?
Answer:
Boiling point of the solution is 100.78°C
Explanation:
This is about colligative properties.
First of all, we need to calculate molality from the freezing point depression.
ΔT = Kf . m . i
As the solute is nonelectrolyte, i = 1
0°C - (-2.79°C) = 1.86 °C/m . m . 1
2.79°C / 1.86 m/°C = 1.5 m
Now, we go to the boiling point elevation
ΔT = Kb . m . i
Final T° - 100°C = 0.52 °C/m . 1.5m . 1
Final T° = 0.52 °C/m . 1.5m . 1 + 100°C → 100.78°C
what is the most poisonous animal?
Answer:
That depends on what species it is
Explanation:
Like reptiles it is rattlesnakes
Spiders would be black widow
So it depends on the what species you what.
Name 2 gram negative bacteria often found in contaminated food
Which statement describes the general process of diffusion?
Molecules move from inside of the cell to outside of the cell.
Molecules start out unevenly distributed and end up evenly distributed.
Molecules start out evenly distributed and end up unevenly distributed.
Molecules move from outside of the cell to inside of the cell.
Answer:
Molecules start out unevenly distributed and end up evenly distributed.
Explanation:
Diffusion is the process by which molecules of a substance move from a region of higher concentration to a region of lower concentration until equilibrium is attained.
Molecules start out unevenly distributed and end up evenly distributed in a particular medium. Diffusion occurs due to the particulate nature of matter. When the particles that make up a substance are concentrated at a point, the collide more often with one another causing each molecule to spread out in order to occupy all the available space.
Diffusion occurs in gases, liquids and solids but occurs fastest in gases. Diffusion can be observed for example, in the spread of the smell of a dead rat from one point in a room to every part of the room.
Answer:
B
Explanation:
:D
A student estimated a mass to be 275 g but upon carefully measuring it found the actual mass to be 260 g. what is the percent error in the estimation?
Answer:
5.77% Error.
Explanation:
Given an experimental value of 275 g , and a theoretical value of 260 g, the percent error can be found using the equation:
[tex]\% \: error \: = \frac{ |theoretical \: value \: - \: experimental \: value | }{theoretical \: value} \times 100[/tex]
% Error = ( | 260 - 275 | / 260 ) × 100 = ( | - 15 | / 260 ) × 100 = ( 15 / 260 ) × 100 = 1500/260 = 300 / 52 = 5.769230769230.. ≈ 5.77%
Craik and Lockhart (1972) proposed the idea that deeper levels of ____ results in stronger retention of memories
A. Rehearsal
B. Multitasking
C. Memory
D. Processing
Answer: D. Processing
Explanation: 100% on topic test also its in my e notes.
Craik and Lockhart has proposed theory of memory processing. Thus, option D is correct.
Craik and Lockhart proposed the theory for the processing of the level of memory. The memory in humans can be sensory memory, working memory, and long-term memory.
The long term memories have been stored in the deeper cells and the increased or strong stimulation of the processing results in the stronger retention of the memories. Thus, option D is correct.
For more information about the memory processing, refer to the link:
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A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (non-reacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.
Answer:
Melting Point.
Explanation:
In testing of a sample has impurities, we have to check the samples’s melting or boiling points or we a separation technique called chromatography.
Now, CaBr_2 which is calcium bromide is a White Hygroscopic Powder. Therefore it is a solid.
Now, a pure solid will always have a fixed melting point which means that it will melt completely at only one temperature.
However, if there are impurities, the melting point of a substance is affected in two ways:
-It's lower than than the fixed melting point
- It would melt at a range of different temperatures as opposed to a fixed temperature for the pure form.
Therefore, a quantity that can be used to determine whether the sample was pure will be melting point.
During respiration, energy is retrieved from the high-energy bonds found in certain organic molecules. Which of the following, in addition to energy, are the ultimate products of respiration?
(a) CO2, H2O
(b) CH3, H2O
(c) CH2OH, O2
(d) CO2, O2
Answer:
(A.) CO2, H2O
Explanation:
The chemical equation for respiration process is:
[tex]C_{6}H_{12} O_{6}[/tex] + [tex]6O_{2}[/tex] → [tex]6CO_{2}[/tex] + [tex]6H_{2} O[/tex] + ATP↑
Energy is released during the biochemical process in the organism's cells in form of ATP. Byproducts of the reaction are carbon dioxide and water molecules.
Let me know if you require any further assistance.
What is an experimental error
Answer:
Explanation: errors in judgment of an observer when reading the scale of a measuring device to the smallest division. 2. Environmental. For example, unpredictable fluctuations in line voltage, temperature, or mechanical vibrations of equipment.
What does the mass of an object depend on?
A. Force of gravity
B. Temperature of the object
C. Time taken of an event to occur
C. Amount of matter that makes up the object
Answer:
D or the 4th one
Explanation:
mass is literally the measure of matter in an object which is essentially the weight or how much stuff there is.
Answer:
C:)
Explanation:
is helium gas a mixture or pure substance
A researcher wants to refine an investigation to determine the effectiveness of an enzyme at various temperatures. Which of the following would best help the researcher determine how well the enzyme is working? Question 20 options: The researcher should measure the difference in temperature during the reaction. The researcher should measure the difference in the amount of product at the beginning of the reaction. The researcher should measure the difference in the amount of enzyme remaining after the reaction. The researcher should measure the difference in the amount of product at the end of the reaction.
Answer:
The researcher should measure the difference in the amount of product at the end of the reaction.
Explanation:
Enzymes are defined as the protiens that are responsible for increasing the rate of reaction.
With the increase in temperature, the enzyme activity increases and so the rate of reaction increases. It means at lower temperature the rate of reaction decreases and the amount of product also decreases.
So, to determine the effectiveness of an enzyme at various temperatures, the difference in the amount of the product at the end of reaction should be measured.
Hence, the correct answer is "D".
120mg=______g please help
Answer:
0.12
Explanation:
Cuz you divide the mass value by 1000.
Much Smort (I look up on internet)
Choose the nonmetallic elements from the list. Check all that apply yttrium: oxygen: boron: polonium: argon: gallium: carbon:
Answer:
Oxygen, Argon, and Carbon.
Explanation:
Just finished the assignment.
Oxygen ,boron and carbon are the non metallic elements. Thus, options B, C, and G are correct.
What are non metallic elements?Non-metallic elements are the elements which easily form negative ions by accepting or gaining electrons and which do not have complete electronic configuration like rare gas. Non metals have high ionization energies and electronegativity.
They are generally poor conductors of heat and electricity. Solid non metals are generally brittle, with little or no metallic lustre.
Most non metals have the ability to gain electrons easily. Non metals display a wide range of chemical properties and reactivities.
In above except oxygen, boron and carbon all other elements are metallic in character that possess metallic property. Thus, options B, C, and G are correct.
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Use the table to identify the phase and phase changes of the elements under the given conditions. Write the name of the substance, phase, or phase change.
When the temperature in a room increases from
25°C to 33°C,
changes from a solid
to a liquid.
In a lab, methane and nitrogen are cooled from
-170°C to -200°C. The methane freezes and the
nitrogen
.
When gold is heated to 2,856°C it changes from a liquid to a
.
Answer: gallium, condenses, gas
Explanation: took assignment on edge
Answer: gallium, condenses, gas
Explanation: took assignment on edge
Variable definition
Answer: is factor that change in a controlled experiment
Explanation:
Why does the flow of science just keep going
Answer:
The Flow of science keeps going because not everything is fully discovered yet. New things are discovered everyday and are also made better as well.
Explanation:
1. Write the name meaning
a. 0.1 gram
b. 0.01 meter
c. 0.000001 liter
e. 1000 000 grams.
L. 10 meters
Answer:
A.. 0.1 gram this means 0.0001kg of the object in SI unit
b. 0.01 meter this means 1 / 10 of 1 meter of the measurement
c. 0.000001 liter this means 1/10000 of the quality of liquid in SI unit
e. 1000 000 grams.this means 1000kg of the object in IS unit
L. 10 meters this means 10 times one meter of the measurement in SI unit
what is the molar mass of CO^2
Answer:
44.01 g/mol
There you go, hope it helped!!!!!
Soda has a density pf 1.05 g/mL. What is the mass of 2000 mL of soda?
A. 2100 g
B. 1905 g
C. 0.0005259
D. 2005 g
Answer:
The answer is option AExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 2000 mL
density = 1.05 g/mL
The mass of soda is
mass = 2000 × 1.05
We have the final answer as
2100 gHope this helps you
What is the speed of an object that moves 100 meters in 5 seconds?
Answer:
speed= distance/time
= 100/5=20mph
You have a different rock with a volume of 30cm and a mass of 60g, What is its density?
how many seconds are there in 45 days?
Answer:3,888,000seconds
Explanation:
60secx60minsx24 hoursx45days=3,888,000
Describe how the proton, electron and neutron were experimentally discovered.
Convert 78.9 kJ into calories
(can you also explain how pls, ty <3)
Answer:.1 kJ = 1000 J and 1J=0.24cal
----->78.9kJ=1000x78.9x0.24=18936cal
Explanation:
This is the unit regulated by the scientific community and they follow the formula that they prove