Explanation: Hey Sonia, I see I'm not the only one at school struggling in Chem. My best guess is to minimize the likelyhood and size-amount of a chemical reaction.
Uranium-238 had a half life of 4.5 billion years. A 100 g sample of U-238 has decayed until only 25 g remain. How long did it take for the sample to decay? (Write the answer in “n billion years”)
awnseris chemical hhhh Explanation:
Which of the following describes the correct order for using the scientific
method?
A. A scientist should collect data, then state the question.
B. A scientist should form a hypothesis, then conduct an experiment.
C. A scientist should conduct an experiment, then state the question.
D. A scientist should draw conclusions, then form a hypothesis.
SERMIT
What is the temperature of 1.485 moles of N₂ gas at a pressure of 1.072 atm and a volume of 20 L?
Answer:
178.67K
Explanation:
PV=nRT
T=PV/nR
= 1.072atm*20L/1.485mol*0.0821LatmK^-1
=178.67K
How does I meter in France compare to I meter in America?
Answer: a meter is a meter
Explanation:
a meter is a certain lenght. it does not change when you're somehwere else
A meter is the SI unit for length. This means that it is an international standard unit which is the same in America and France.
What is the SI unit of measurement?The International System of Units (SI) is a French system. It is called French Système International d’Unités. It is an international decimal system of weights and measures. It has been derived from the metric system and extended it further.
It was adopted by the 11th General Conference on Weights and Measures (CGPM) in the year 1960, it is abbreviated as SI in all languages.
In the 19th and 20th centuries, rapid advances took place in the field of science. These developments resulted in the development of several overlapping systems of units of measurement. These were improvised by scientists to meet the practical needs of their disciplines.
The earlier international system that was developed for solving this issue was called the meter-kilogram-second (MKS) system. Then there was the CGPM system which added three new units in 1948. It used a unit of force, the newton.
It is defined as the force that can be given to a mass of one kilogram to provide it with an acceleration of one meter per second per second. Also a unit of energy, the joule was defined. It is the work done when the application of a newton on a point is displaced by one meter in the direction of the force.
There was also a unit of power, the watt. This is the power that gives to the energy of one joule. All of these three units were named after eminent scientists.
Therefore, a meter is the same in America as well as France.
Read more about the SI system, here
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What is the volume of an object with a mass of 11.5 g and a density of 1.3 g/mL?
Answer:
The answer is
8.85 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass of object = 11.5 g
density = 1.3 g/mL
The volume is
[tex]volume = \frac{11.5}{1.3} \\ = 8.846153[/tex]
We have the final answer as
8.85 mLHope this helps you
The force of gravity between two objects is greater when the objects have 
Answer:
Objects with greater mass have a stronger force of gravity between them.
Explanation:
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled.
calculate the number of atoms of sodium in a 4.5-gram sample
Answer:
1.18×10²³ atoms.
Explanation:
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.
From the above concept, 1 mole of sodium also contains 6.02×10²³ atoms.
1 mole of sodium = 23 g.
Thus,
23 g of sodium contains 6.02×10²³ atoms.
Therefore, 4.5 g of sodium will contain = (4.5 × 6.02×10²³)/23 = 1.18×10²³ atoms.
From the above calculation,
4.5 g of sodium contains 1.18×10²³ atoms.
which of the following represents ca chemical change. rocks being smoothed by rapid water movement iron attraction to a magenta the pink color of a rose decomposition of stone due to acid rain
Answer:
The answer is decomposition of stone during acid rain
Explanation:
The reason being is that decomposition is most likely a result of a chemical change.
1.014)
are simple and often expressed as mathematical equations.
A. Hypotheses
C. Theories
B. Laws
D. Procedures
A certain liquid has a density 0.80g/ml. What is the mass of a 40 ml sample of this liquid
Answer:
32
Explanation:
0.80 x 40= 32
density = mass/volume
mass= density x volume
6. Suppose you are going to measure the length of a pencil in centimeters.
What should you do to get the most accurate measurement? If you give
the ruler to three different friends, what should they do to achieve good precision?
Answer:
Their answers must be in two decimal places
All of them should view the scale from the front to avoid parallax error and the scale should be kept corresponding to the end of the pencil to accurately measure its length.
What is a parallax error?
Because your eye is angled toward the measuring marks, parallax error happens when the length of an object is measured as being longer or shorter than it actually is. For instance, someone looking at a car's speedometer from the driver's seat will see it clearly and receive an accurate reading.
Due to the angle formed by his eye, the speedometer, and the arrow, a person observing the speedometer from the passenger seat will overestimate the reading.
On a ruler or other similar instrument, position your line of sight such that it is immediately above the measurement marking, creating an imagined vertical line between your eye, the marking, and the item. The main reason for parallax error is when you see an item in relation to the scale from an angle that causes it to appear to be at a different location on the scale.
Therefore, they should view the scale from the front to avoid parallax error and the scale should be kept corresponding to the end of the pencil to accurately measure its length.
Read more about parallax error, here
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An increase in pressure increasing the boiling point of a liquid is an example of a- physical property b-chemical property c-physical change d- chemical changcgre
Answer:
Ans. C. physical change
Explanation:
Physical: boiling and melting are physical changes. When water boils no bonds are broken or formed.
I’ve been trying to figure this out for a few hours
Answer:
12) 55.8 amu (3 s.f.)
13) 0.99 amu (3 s.f.)
14) 12.035 amu
Explanation:
Please see attached picture for full solution.
Please help me do this question
How many pages is 5000 words? Double spaced, 5000 words is around 20 pages; single spaced about 10 pages. Now, if you're using an unconventional formatting or margins you could see different results, however, with standard word processor defaults and a 12 point Arial or Times New Roman font your output should be very similar. Examples of 5000 word count pages include college theses, dissertation research, or very comprehensive, in-depth blog posts.
Answer: 5000 words is 10 pages single spaced or 20 pages double spaced.
Pages by Word Count
Use our handy table to discover how many pages a given word count yields, single or double spaced, in Times New Roman or Arial 12 point font.
Word Count Pages (single spaced) Pages (double spaced) Font Size
250 WORDS ½ PAGE 1 PAGE 12 POINT
300 WORDS ⅔ PAGE 1⅓ PAGES 12 POINT
400 WORDS ⅘ PAGE 1⅗ PAGES 12 POINT
500 WORDS 1 PAGE 2 PAGES 12 POINT
600 WORDS 1⅓ PAGE 2⅔ PAGES 12 POINT
750 WORDS 1½ PAGES 3 PAGES 12 POINT
800 WORDS 1⅗ PAGES 3⅕ PAGES 12 POINT
1000 WORDS 2 PAGES 4 PAGES 12 POINT
1200 WORDS 2⅖ PAGES 4⅘ PAGES 12 POINT
1500 WORDS 3 PAGES 6 PAGES 12 POINT
2000 WORDS 4 PAGES 8 PAGES 12 POINT
2500 WORDS 5 PAGES 10 PAGES 12 POINT
3000 WORDS 6 PAGES 12 PAGES 12 POINT
3500 WORDS 7 PAGES 14 PAGES 12 POINT
4000 WORDS 8 PAGES 16 PAGES 12 POINT
5000 WORDS 10 PAGES 20 PAGES 12 POINT
6000 WORDS 12 PAGES 24 PAGES 12 POINT
7500 WORDS 15 PAGES 30 PAGES 12 POINT
8000 WORDS 16 PAGES 32 PAGES 12 POINT
10000 WORDS 20 PAGES 40 PAGES 12 POINT
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How Many Pages is 4000 Words?
How many pages does 4000 words equal? Single spaced, 4000 words would produce about 8 pages; double spaced around 16 pages.
How Many Pages is 300 Words?
How many pages is 300 words? The answer is close to two-thirds of a page single spaced, and around one and one-third of a page double spaced.
How Many Pages is 400 Words?
How many pages does 400 words take? A word count of 400 words will result in around four-fifths of a page single spaced and and one and three-fifths of a page double spaced.
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The cows in a rancher's herd of cattle have been selectively bred to
produce milk. Which of the following will cause the next generation of
cows to receive the trait for producing large quantities of milk?
a. nutrients in the cows' food
b. essential minerals in the cows' water
c. electrical impulses in the cows' brains
d. information in the cows' chromosomes
Answer:
Information in the cows chromosomes answer d
Explanation:
Study island help pleaseeee
Answer:
A or D should be the answer
Acid base reaction is also called neutralization reaction why?
Answer :
When an acid and a base react, the reaction is called a neutralization reaction. That's because the reaction produces neutral products. Water is always one product, and a salt is also produced. A salt is a neutral ionic compound.
2) What is the effect of time of day on temperature? The dependent variable
would be: *
The day the temperature was taken
Time of day the measurements were taken
Time in between the measurements
Temperature change
Answer:
Are we talking about body temperature or atmospheric temperature?
Select the correct image. Which element is a noble gas?
Answer:
He (Helium)
Explanation:
According to the Periodic Table, our noble gases are:
Helium - Element 2
Neon - Element 10
Argon - Element 18
Krypton - Element 46
Xenon - Element 54
Radon - Element 86
Which statement about gases is true?
They are made up of particles that always move very slowly.
They are made up of particles that travel in a curved path when in motion.
They are made up of hard spheres that vibrate quickly in stationary positions.
They are made up of hard spheres that are in random motion.
Answer:
they are made up of hard spheres that are in random motion
Answer:
D) They are made up of hard spheres that are in random motion.
Explanation:
What do physicists study? O A. Economics O B. The properties of matter C. Living things D. How matter and energy interact
A form of matter with an indefinite shape but a definite volume. It will take the shape of its container, but it will keep its own volume
Liquid
Intensive Property
Extensive Property
Solid Gas
Study this graph showing attendance at a swimming
pool throughout the year.
The trend of this data from January to December, can
best be described as
Visitors at Public Pool
1,500
1.200-
000-
Number of Visitors
600-
300-
0-1
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Answer: Nonlinear
It's the right answer, I got it right so I'm 99.99% it'll be for yours too.
Answer:
Nov. ✔ = Feb.
Oct. ✔ < Dec.
Jan. ✔ > Nov.
Explanation:
This IS the right answer!☺️
A physical property can be _________. A. altered with a physical change. B. used to change the identity of a substance. C. observed using the 5 senses. D. a chemical property as well.
Answer:
It is C. observed using the 5 senses.
Explanation:
you can observe a substance without changing its identity.
A physical property can be a chemical property as well.
A physical property refers to a characteristic or behavior of a substance that can be observed or measured without changing the substance's chemical composition. Physical properties include characteristics such as color, density, melting point, boiling point, solubility, conductivity, and so on.
Option A, "altered with a physical change," is true for physical properties. Physical changes, such as changes in state (solid to liquid to gas), changes in shape, or changes in phase, can alter certain physical properties of a substance without changing its chemical composition.
Option B, "used to change the identity of a substance," is not accurate for physical properties. Physical properties alone do not change the identity or chemical composition of a substance.
Option C, "observed using the 5 senses," is partially true. Some physical properties, such as color, odor, and texture, can be observed directly using the senses. However, many physical properties require specific measurement techniques or instruments to be accurately determined.
Option D, "a chemical property as well," is true. Some physical properties can also provide information about the chemical behavior or reactivity of a substance. For example, flammability, reactivity with acids or bases, or oxidation resistance are both physical and chemical properties, as they involve the behavior of a substance during a chemical reaction or interaction.
Therefore, the correct answer is D. a chemical property as well.
Learn more about physical property from the link given below.
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Find the density of a liquid with a volume of 3.8 mL and a mass of 3.75 g
Answer:
The answer is
0.99 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} [/tex]From the question
mass of liquid = 3.75 g
volume = 3.8 mL
Substitute the values into the above formula and solve for the density
The density is
[tex]density = \frac{3.75}{3.8} \\ = 0.98684210...[/tex]
We have the final answer as
0.99 g/mLHope this helps you
what is the electron configuration of an electrically neutral alkaline earth metal? please explain
Answer:
The elements in Group 2 (beryllium, magnesium, calcium, strontium, barium, and radium) are called the alkaline earth metals (see Figure below). These elements have two valence electrons, both of which reside in the outermost s sublevel. The general electron configuration of all alkaline earth metals is ns
A scientist discovers a deep bowl-like divot under the ocean off the coast of eastern Mexico that is many kilometers across. The layers of the ground all around the continent from around the time that structure formed contain large amounts of iridium and a larger number of fossils than is normally found. What most likely caused the bowl-like structure?
a meteorite impact
an asteroid impact
an iridium spike
a Kuiper object impact
Answer:
an asteroid impact or B
Explanation:
An asteroid impact most likely caused the bowl-like structure. Hence, option B is correct.
What is divot or bowl like structure?A divot are the marks made in the grass on the golf course. So, scientist named a bowl like structure form in under the ocean off the coast of eastern Mexico.
An impact event is a collision between astronomical objects causing measure effect.If the asteroid hits on land of the earth there will be the huge amount of dust thrown up into the atmosphere.If it hits water, then there would be an increase in water in the atmosphere.Example: the impact of asteroid ended the age of dinosaurs a 66 million years ago.
It kills more than 75 percent of earth species.The asteroid impact in ocean made bowl type structure called divot these kilometers in size so big as compared to a football ground.
An asteroid impact most likely caused the bowl-like structure. Hence, option B is correct.
Learn more about asteroid impact. here:
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Consider the function f(x) =
9-82
x² - 4
For which intervals is f(x) positive? Check all that apply.
(-0, -3)
(-3,-2)
(-2, 2)
0 (2, 3)
0 (0o, 3)
the precautions that must be taken when carrying out experiments with hydrogen
Answer:
Never smoke near a place where hydrogen is generated or being used. Remove all possible sources of flame and sparks. Hydrogen should only be generated and used in a well ventilated out door area. Precautions must be taken to remove all possibilities of fire or explosion.
Which of the following is NOT a valid conversion factor?
a
1 dozen
12 cookies
b
60 seconds
1 minute
C
1 yard
3 feet
12 hours
1 days
Answer: 12 hours
1 days
Explanation:
