Answer:
The type of liquid in the tub (salt water or vinegar)
Explanation:
The manipulated independent variable in Anita's experiment is the type of liquid in the tub.
The independent variable is the controlled or manipulated variable in the course of an experiment. It can also be referred to as the 'cause' variable which has the capacity to produce 'effects' on another variable - the dependent variable.
In this case, the type of liquid the tub is filled (salt water or vinegar) will hypothetically affect the rusting period of the steel. Hence, the dependent variable is the type of liquid the tub is filled while the dependent variable would be the time it takes for the steel to get rusted.
Question 18 of 25
Which sentence best describes what happens when a neutral atom becomes
a positive ion?
A. The protons pull harder on the remaining electrons.
B. The remaining electrons are more easily lost.
C. The remaining electrons spread farther out.
D. The protons push the remaining electrons away.
Answer:
d is the answer I think .....
What is the name AND mass number of an atom with 4 protons and 4 neutrons?
Astatine-210 has a half-life of 8.08 days. What fraction of a sample of astatine-210 is left unchanged after 16.16 days?
Answer:
0
Explanation:
Given parameters:
Half-life = 8.08days
Unknown:
What fraction is left unchanged after 16.16days = ?
Solution:
The half - life of a substance is the time taken for the half of a radioactive material to decay to half.
Day 0 Day 8.08 Day 16.16
100% 50% 0% Parent
0% 50% 100% Daughter
After 16.16 days, non of the original sample will remain unchanged.
What is the mass, in grams, of 7.5 x 1015 molecules of ammonia, NH3?
Answer:
7.6125
Explanation:
multiply 7.5 with 1015
yll got 76125 divide it by 1000 to get answer in grams
The mass in grams of 7.5 × 10¹⁵ molecules of ammonia is 21.08 × 10⁻⁸ g.
How do we calculate mass from moles?Mass of any substance from moles will be calculatd as:
n = W/M , where
W = required mass
M = molar mass
We know that in 1 mole of any substance 6.022 × 10²³ particles of that sybstance are present.
No. of moles in 7.5 × 10¹⁵ = 7.5 × 10¹⁵molecules / 6.022 × 10²³ molecules per mole
No. of moles in 7.5 × 10¹⁵ = 1.24 × 10⁻⁸ moles
Molar mass of ammonia = 17 g/mol
Now we put the requred values on the first equation to get the mass as:
W = (1.24 × 10⁻⁸mol)(17 g/mol)
W = 21.08 × 10⁻⁸ g
Hence required mass of ammonia is 21.08 × 10⁻⁸ g.
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The number of atoms of an element in a chemical formula is given by the _________.
Answer:
Explanation: In a chemical formula, the symbols for each element in the compound are followed by subscripts that tell us how many of that element are in the compound. The subscripts that follow each element's symbol indicate how many of that element are in the compound. Notice how H is located in more than one place.
Explanation:
the atomic number tells us all of the following except ..
Answer:
b
Explanation:
The atomic number tells us all of the following except B. The order in which the elements were discovered.
What does the atomic number let you know?
The atomic number is the number of protons in the nucleus of an atom. The number of protons outline the identity of detail (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
What pieces of facts do the atomic number inform you?The atomic variety helps human beings discover factors in step with the variety of protons one atom of the element has. It essentially defines the element. while having a neutral rate, it also offers the variety of electrons the detail has (in one atom). while isotopes are a component, it would not completely exchange the atom.
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Igneous rocks are classified by mineral composition and ?
1. How fast it weathers .
2. Sizes of the rock .
3. Texture .
4. Density.
Answer:
3. Texture.
Explanation:
Igneous rocks texture refers to the size of minerals in the rock, which is assessed by how visible they are to the naked eye.
PLSSSSSSSSSSSSSSSSSSSSSSSSSS HELP
Which of the following best describes physical weathering? (4 points)
A series of chemical changes that wears away at rocks
The movement of rocks from one area to another
Any large-scale event such as volcanic eruptions or earthquakes
A process that breaks down large rocks into smaller piec
Answer:
D. A process that breaks down large rocks into smaller pieces.
Explanation:
Physical weathering if referred to the process of rocks breaking apart without changing their chemical composition. If you look at the other answers, none of them match the description of physical weathering.
Answer:
A process that breaks down large rocks into smaller pieces.
1. At what temperature dose water freeze
2. at what temperature dose ice melt
3. At what temperature dose water boil
Answer:
1. water will freeze at a temperature below 32 degrees fahrenheit 0 degree celsius.
2. Ice will melt at a temperature above 32 degrees fahrenheit 0 degrees celsius.
3. water boils at 212 degrees fahrenheit or 100 degrees celsius.
Which one of the following statements about orbitals is INCORRECT?
1) orbitals are regions in space where one is likely to find an electron
2) orbitals can hold up to two electrons
3) orbitals can hold two electrons provided they are spinning in the same direction
4) s, p, d and f orbitals are possible
3) orbitals can hold two electrons provided they are spinning in the same direction
We define an orbital in chemistry as a region in space where there is a high probability of finding an electron.
Each orbital holds a maximum of two electrons which spin in opposite direction according to Pauli exclusion principle.
According to this principle no two electrons can have the same set of quantum numbers. As a result, the spin quantum numbers of two electrons in the same orbital must differ hence they spin in opposite directions.
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how does voltage work in a circuit?
Answer:
Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light.
Explanation:
I hope this is right i found it off a website called fluke!
Which term means finding ways to describe and explain the natural world
through observations and experiments?
A. Pseudoscience
B. Philosophy
C. Chemistry
D. Science
Answer:
D. Science i think
Explanation:
Given the name of an element and the number of neutrons, find the mass of an Isotope
The given element nitrogen have 7 electrons and 7 protons. Mass number is the sum of number of protons and neutron. The number of neutrons is 7. Thus mass number of the isotope is 14.
What is nitrogen?Nitrogen is 7th element in periodic table. It is an electronegative element and is included in p block. Nitrogen exists as gas but sometime it can be liquified under high pressure.
Isotopes are atoms with same atomic number and different mass number. Nitrogen have two isotopes. N-14 and N-15. Mass number is the sum of number of protons and neutrons.
Even though isotopes are different in mass number their chemical properties will be similar but there exists slight changes in their physical properties.
Here, we have 7 protons and 7 electrons therefore, the mass number 14.Thus the isotope given in the diagram is N-14.
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Level 1: You are attempting to identify an unknown substance. Use the table to
answer the questions below.
Substance
Formula
Mass,
Color
Physical
State
Density Boiling
. (g/cm) Point,
Methane
CH
16.0
Gas
Colorless
0.423
-161.5
Ammonia
NH,
17.0
Gas
Colorless
0.70
-33
Unknown
???
???
???
???
???
???
Propane
CH
Gas
Colorless
0.493
-42.1
Bromine
Br.
159.8
Liquid
Red
4.04
58.8
Lithium
Li
6.94
Solid
0.534
1342
Silvery,
white
metal
Magnesium Mg
24.3
Solid
1.74
1090
Silver,
white
metal
Maggie has 4 binders with 30 stamps in each binder. She has 3 binders with 36 baseball cards in each binder. If she gives away 45 stamps to a friend, how many stamps and cards does she have left? Maggie has stamps and cards left.
Answer:
The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183
Explanation:
If Maggie gives 45 stamps to a friend, you must calculate the number of stamps and cards she has left.
You know Maggie has 4 folders with 30 stamps in each folder. So the number of stamps she owns is calculated as:
4 folders*30 stamps in each folder= 120 stamps
If Maggie gives 45 stamps to a friend, then the number of stamps she has left will be calculated as the difference (the subtraction) between the stamps she owned and the ones she gives away:
120 stamps - 45 stamps= 75 stamps
On the other hand, she has 3 binders with 36 baseball cards in each binder. So the number of cards she owns is calculated as:
3 binders * 36 baseball cards in each binders= 108 baseball cards
The number of stamps and cards you have left is calculated as:
75 stamps + 108 baseball cards= 183
The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183
Name 3 sources of carbohydrates for the production of an alcoholic drink
Answer:An alcoholic drink is a drink that contains ethanol, a type of alcohol produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcohol plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages.
Explanation: vodka the preferred alcoholic beverage of choice among alcoholics? #3 Doesn't make you feel bloated or full like beer does. It goes down quickly and smooth. #4 Gets you drunk just as fast as any other hard liquor can, and obviously much faster than beer or wine.
Populations in the deep-sea vent ecosystem can get energy storage molecules without sunlight. Do you agree or disagree with this claim? Explain your answer.
Answer:
Agree
Explanation:
The deep-sea vent ecosystem gets energy storage molecules without sunlight. Life in the vent ecosystem relies on alternate energy through the use of hydrogen sulfide present in the water emanating from the vent.
The producers that form the basis of the food chain are bacteria that use the hydrogen sulfide to create energy-rich molecule in a process known as chemosynthesis.
The equation of the chemosynthesis is as below:
[tex]CO_2 + 4H_2S + O_2 --> CH_20 + 4S + 3H_2O[/tex]
400 liters of a certain gas is collected at STP. What will the volume be at 273 C and 190 torr pressure?
Answer:
2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at STP? STP is a common abbreviation for "standard temperature and pressure." You have to recognize that five values are given in the problem and the sixth is an x. Also ... 273 1. A gas has a volume of 800.0 mL at minus 23.00 °C and 300.0 torr.
Explanation:
Is meat a mixture or substance?
Answer:
This type of meat is substance. If you were talking about meters then it would be a system of measurement.
Answer:
Mixture
Explanation:
Meat is composed of approximately 72–75 % water, 21 % nitrogenous compounds (19 % proteins and 1.5 % nonprotein nitrogen compounds which include nucleotides, peptides, creatine, and creatinine), 2.5–5 % lipids, 1 % non-nitrogenous compounds (vitamins) and carbohydrates (a very small amount of glycogen).
2. Mrs. Matthews went to Edisto beach with her husband and two children. She forgot the
sunscreen and the UV Index was extremely high at a level 10. Her whole family got very sunburnt.
Which energy transfer caused the sunburn?
(20 Points)
Radiation
Conduction
O Convection
Kinetic Energy
Answer:
A; radiation
Explanation:
also, please dont use brainly to copy and paste every answer to get them right, use it when u need help
Urgent help plzzzzzz?!!!!!!!!!!!
Answer:
Explanation:
For 4 all you have to do is take the -log(H3O+) and then use your PH values to identify if it's acidic or basic
a. 2.06 - acidic
b. 8.4 - basic
c. 6.67 - acidic
d. 5.85 - acidic
how many atoms are in hydrogen
Answer:6.02
Explanation:
Answer:
there are about 6 atoms in hydrogen
A student observes that a popcorn kernel has a hard coat. He places the kernel in a moist paper towel and observes it for several days. He notices that the coat splits and a small root emerges. He concludes that
Answer: Water inside the seed coat creating a pushing force, breaking the seed coat.
Explanation:
Seed germination can be defined as the process by which a new plant emerge out from a seed. The radicle is the first emerging part from a seed and it develops into a root and the plumule is the second emerging part and it develops into a shoot. The light, water, adequate temperature, and soil are the factors that are necessary for seed germination.
According to a given situation, the popcorn kernel will receive the moisture necessary for the germination process, the water will imbibe into the seed coat creating pressure inside the seed and which will cause the seed coat to break and the new plant parts or seedling will emerge out of the seed coat.
Please help :(
I just need the bottom true or false part
Answer:
if you mean question 21
true
Explanation:
sorry if wrong
Ice floats due to its?
Answer: it floats because it’s less dense than water
Explanation: since it’s less dense it floats
Aly's science class was looking at bacteria through a microscope. Aly's teacher said some bacteria can be as small as 0.00365 cm long. What is the length of the bacteria written in scientific notation?
Answer:
[tex]0.00365\ cm=3.65\times 10^{-3}\ cm[/tex]
Explanation:
Aly's teacher said some bacteria can be as small as 0.00365 cm long.
In this problem, we need to write the length of the bacteria written in scientific notation. Any number can be written in the form of scientific notation as follows :
[tex]N=a\times 10^b[/tex]
a is a real no and b is an integer
In the given number, there are two zeroes before 3. We need to shift the decimal after 3. It can be done as follows :
[tex]0.00365\ cm=3.65\times 10^{-3}\ cm[/tex]
Hence, this is the required solution.
Perform a DNA extraction from green peas at home or school lab, under adult supervision, by following the given procedure carefully.
Procedure for DNA extraction:
To half cup of split peas, add 1/8 teaspoon of salt and one cup of cold water.
Transfer this mixture in a blender and blend it on high speed for 15 seconds.
Filter the blended mixture, using a strainer, into a measuring container. Observe the amount of mixture you obtain after filtration. Add liquid detergent equal to 1/6 volume of the obtained pea mixture.
Mix by swirling. Allow the mixture to rest for about five to ten minutes.
Transfer this mixture to test tubes. Fill the tubes to about 1/3 of their volume.
Add a pinch of meat tenderizer to each of these tubes. Mix gently to avoid damaging the DNA.
Tilt the test tube, and pour alcohol (75% isopropyl alcohol or 95% ethanol) down the sides of the tube. Add alcohol to about 2/3 volume of the tube. You will obtain two layers. The layer at the top contains the DNA.
Now that you are done with the DNA extraction process, answer the following questions:
What purpose does blending the pea mixture serve?
Why do you need to add liquid detergent?
What role does the meat tenderizer play?
Why is alcohol added and why does the DNA get extracted in the alcohol layer?
Answer:
Blending is done to break open, or lyse, the cells.
DNA resides in the nucleus, which is enclosed by the nuclear membrane. The nucleus is further enclosed by the cell membrane. So, to get the DNA, we need to break open both the membranes. Cell membranes are made up of lipids and proteins. The detergent molecules to attach to the cell and nuclear membranes, causing them to break open.
Meat tenderizer contains the enzyme protease that helps cleave proteins. Even after breaking open the nucleus and cell membrane, the DNA is still protected by cell proteins. Meat tenderizer cleaves the proteins, leaving behind only the DNA molecule.
DNA is insoluble in alcohol and hence, when alcohol is added, it precipitates out the DNA.
Explanation:
PLATO Answer
The digestive system is a group of organs working together to...
The independent variable and dependent and constant
Answer:
Explanation:
independent-longer wire
dependent-bulbs being brighter
constants-lamp brand and so on
A 5.0-mL sample of CO2 gas is enclosed in a gas-tight
syringe (Figure 11.3) at 22 °C. If the syringe is
immersed in an ice bath (0 °C), what is the new gas
volume, assuming that the pressure is held constant?
Answer:
3.5ML
Explanation:
At the constant pressure, the final volume of the carbon dioxide gas was equal to 4.62 ml at a temperature of 0ºC.
What is Charles's law for volume-temperature relation?Charles's law can be explained as when the pressure of the gas is kept constant, the volume of gas is directly proportional to the temperature of a gas.
The volume of the gas and the temperature of the gas have a direct relationship according to this law.
Therefore, V∝ T
or V₁/T₁ = V₂/T₂ ....................(1)
Given, the initial temperature of the CO₂ gas, T₁ = 22 ºC
T₁ = 22 + 273 = 295 K
The final temperature of the CO₂ gas, T₂ = 0ºC
T₂ = 0 + 273 = 273 K
The initial volume of the gas, V₁ = 5 ml
Substitute the value of V₁, T₁, and T₂ in equation (1 ) to get final volume of CO₂ gas:
5/295 = V₂/273
V₂ = 4.6 ml
Therefore, the final volume of the gas is equal to 4.6 ml at 0 ºC, when there is no change in the pressure.
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