Answer:
Water vapor molecules in the air near the can cooled when energy from the air transferred to the cold can. These water molecules slowed down, condensed to liquid water, and then froze to become ice. Your can might have some water and some ice on the outside of it.
Explanation:
Is it possible to prove that something is real or true of you can’t directly observe it? If no, why not? If yes, how would you do that?
Answer:
yes
Explanation:
Anything that is verifiable and repeatable is likely to be true. If not verifiable and repeatable, then it may well be completely false, or at least partially false.
This holds for much more than just religious beliefs. What about political thought? One perfect example was when President Obama was pushing his ACA (Obamacare). His facile claim was that with medical coverage for all, the costs of health care would go down. Because people would take better care of themselves, avoiding those major medical bills. But that's just a banality, right? Just words that sound good. I'm not saying that morally, universal health care is wrong. I am saying, don't assume something to be true just because it sounds good. (Of course, health care costs went up, not down.)
Is it true that if you get your car washed every week, it will last longer and cost you less in the long run? Of course not. But it sounds good. People will nod their heads in mindless, lazy agreement. You'll have a cleaner car, you will most likely pay more, and it may last less long, depending on any number of factors. Exactly the same as health care
3.
Alum is used in water treatment as
A. a germicide.
В. a decolourising agent.
C. an antioxidant.
D. a coagulating agent.
Answer: Alum is used in water treatment as a germicide
Explanation:
A. a germicide
Why does the author include information about bread and sandwich wrappings in the article?
(A) to show that the scientific method is often used to understand things about food
(B) to provide an example of something that can be tested by the scientific method
(C) to demonstrate the problems that can be caused by improper seals and wrappings
(D) to help evaluate how the weight of bread can show how much moisture it has
Answer:
what is the story about actually.i think it's from ur lesson
Explanation:
certain breads mold easily...(fact)..
especially white bread., when exposed to any moisture, from refrigeration, or freezing..
when taken out of (cold environment), humidity in air causes molding because you take it from cold to/warm environment.
check expiration dates, keep refrigerated, and inspect 4 molding. Companies like WMART, buy in bulk, when on shelf, defrosts,, then has molding within expiration dates..
I need Help can someone help
Answer:
no bueno
Explanation:
A pan containing 20.0 grams of water was allowed to cool from a temperature of 95.0 °C. If the amount of heat released is 1,200 joules, what is the approximate final temperature of the water?
75 °C
78 °C
81 °C
87 °C
Answer:
81 °C
Explanation:
This is a calorimetry question so a few things you will need for this. The calorimetry equation q=mcΔT & the specific heat of water (4.2J/g•°C). Other definitions are:
q = heat added/released by a sample
m = mass of sample
c=specific heat of sample
ΔT = change in temperature
from here we can rearrange the equation to state:
q/(mc) = ΔT
1200J/((20.0g)(4.2J/g•°C)) = ΔT
14°C = ΔT
If the starting temperature was 95.0°C and we know that the temperature was cooled by 14°C then the final temperature of the water would be 81.
Answer:
C. 81 c
Explanation:
took the test :)
where do we get the mass number
Explanation:
Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
diantara senyawa di bawah ini yang tidak berisomer dengan n- heksana adalah
a) 2 metil pentana
b) 2 etil pentana
c) 2,2 dimetil butana
d) 2,3 dimetil butana
e) 3 metil pentana
How many atoms of each elements are in three molecules
Answer:
Molecules of compounds have atoms of two or more different elements. For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom.
Explanation:
Why is it difficult to classify dissolving as simply a physical or a chemical change?
It is difficult to classify dissolving as physical or chemical change because at some point dissolving produce new substance which can not be reversed while at some point no new substances are produced but and the process is reversed.
Physical change is a change in which no new substance is formed and the process is easily reversible. For example, the dissolution of salt in water is a physical change since we can reverse the process to obtain salt and water.
Water + Salt <=> Salt Solution
Chemical change is a change in which new substance is formed and and the process is not reversible. For example, the dissolution of metal in acid is a chemical change since we can not reverse the process to obtain the metal.
Acid + metal —> Salt + hydrogen gas
2Na + 2HCl —> 2NaCl + H₂
Thus, we can see that it is difficult to classify dissolving as a physical or a chemical change.
Learn more: https://brainly.com/question/19210143
can someone suggest me topics for chemistry project work?
Answer:
Which
PLEASE MARK AS BRAINLIEST ANSWER
define mass number in your own words
Answer:
The total number of protons and neutrons in the nucleus of an atom is called mass number.
Answer:
mass number also called nucleon number and it's the total number of neutron and proton in an atomic nucleus.
mention four states of matter and explain and give examples
Answer:
solid: ice.
liquid: water
gas: methane
plasma: lightning
Explanation:
Distillation can be separated in what technique?
A. Chemical
B. Physical
Answer:
B. Physical process is the way distillation can be separated.
c. Mention the function of corolla.
Answer:
Overall, the main function of the corolla is to assist in the reproductive process of the plant. The petals of the corolla are designed to aid in pollination, and therefore, increase the chance of successful reproduction of the flower.
to assist in the reproductive process of the plant...
10.74cm^3 to liters
Please show a step by step process on how to solve.
Answer:
I HOPE IT WILL HELP YOU A LOT.
How would you change the type of atom
Answer:
Hi, There! :)
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element.
Answer:
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element. All known elements are arranged on a chart called the Periodic Table of Elements.
Explanation:
that's what I found buddy
To reduce the costs of extracting aluminum, what must be added to it to reduce the melting point?
Explanation:
To reduce costs, powdered aluminium oxide is dissolved in molten cryolite. This ionic compound melts at a lower temperature than aluminium oxide, reducing costs.
In the single replacement reaction between magnesium and HCl what reaction resulted from inserting the lit splint into the test tube mouth ?
Answer:
Magnesium reacts with dilute hydrochloric acid in a conical flask which is connected to an inverted measuring cylinder in a trough of water. The volume of hydrogen gas produced is measured over a few minutes, and the results are used to plot a graph
Explanation:
Hope it will help you
Answer:
Adding magnesium metal to hydrochloric acid produces hydrogen gas. The magnesium dissolves to form magnesium chloride, MgCl2.
burning. If you observe a gas forming, test for its identity by inserting a glowing wood splint into the mouth of the test tube. ... This is a “glowing splint.” If the splint continues to glow, oxygen gas is present. Do not put the splint into the solution.
hope it's help you....!!!!!!
#rishu
If acid spills on your shoulder, you should use the
Answer:
laboratory/safety shower.
Otherwise, immediately wash with water and tell your teacher or instructor.
In a chemical reaction, reactants are the substances that you _________ with and the products are the substances that you _________ with
Answer:
Start, Finish
Explanation:
Reactants react. Products are the end result.
The molar mass of C3H8O2 (three significant figures) is ________.
Answer:
[tex]\boxed {\boxed {\sf 76.1 \ g/mol}}[/tex]
Explanation:
We are asked to find the molar mass of C₃H₈O₂.
The molar mass is the mass of 1 mole of a substance. The values are found on the Periodic Table because they are equivalent to the atomic masses. However, the units are grams per mole instead of atomic mass units.
Look up the molar masses of the individual elements in the compound: carbon, hydrogen, and oxygen.
Carbon (C): 12.011 g/mol Hydrogen (H): 1.008 g/mol Oxygen (O): 15.999 g/molLook at the subscripts in the formula. There is a subscript of 3 after C, another of 8 after H, and another of 2 after O. Therefore, there are 3 moles of carbon, 8 moles of hydrogen, and 2 moles of oxygen in every mole of the compound. Multiply the element's molar mass by the subscript.
C₃: 12.011 * 3 = 36.033 g/molH₈: 1.008 * 8 = 8.064 g/mol O₂: 15.999 *2=31.998 g/mol[tex]36.033 + 8.064 + 31.998 = 76.095 \ g/mol[/tex]
Round to the 3 significant figures. For the number we calculated, that is the tenths place. The 9 in the hundredth place to the right tells us to round the 0 up to a 1.
[tex]76.1 \ g/mol[/tex]
The molar mass of C₃H₈O₂ is approximately 76.1 grams per mole.
Note:-
Approximate Values taken for Atomic masses
Solution:-
[tex]\\ \rm\longmapsto C_3H_8O_2[/tex]
C=12uH=1uO=16u[tex]\\ \rm\longmapsto 3(12u)+8(1u)+2(16u)[/tex]
[tex]\\ \rm\longmapsto 36u+8u+32u[/tex]
[tex]\\ \rm\longmapsto 44u+32u[/tex]
[tex]\\ \rm\longmapsto 76u[/tex]
[tex]\\ \rm\longmapsto \approx76g/mol[/tex]
Second ionization energies are always _____ than first ionization energies because the remaining electrons are attracted _____ strongly as the positive charge on the ion increases. A large jump in ionization energies is always observed after the _____ electrons have been removed.
Both protons and neutrons are located inside the nucleus of an atom. Changing the number of neutrons in the nucleus would form different isotopes of the same element. Which of these Best describes the outcome of decreasing the number in the nucleus?
Answer:
The number of protons in an element is the same thing as the element's atomic number. Which means that bringing any change to the number of protons in an element by decreasing it would change the element as well as the number in the nucleus completely.
measure 25 mL of water in a 50 mL graduated cylinder. pour the 25 mL of water into the 250 mL beaker and record the mass of the beaker + water. Now find the mass of just the water.
Answer:
so i think mass of water is 235 ml
How did the development of the earliest idea about atoms differ from the later work of scientists?
A.It was based on sound evidence.
B.There were explanations for the idea.
C.It was based on the thoughts of an early philosopher.
D.There were experiments conducted to support the idea.
Answer:
C
Explanation:
The early ideas of the atom states that the indivisible object is hollow or is a solid object with nothing inside. The later discoveries or works of the scientists states that inside the atoms are the subatomic particles which are the electrons, protons, and neutrons.
Vapor pressure of any liquid _______. A. increases with increases in temperature B. increases with decreases in temperature C. is not affected by changes in temperature D. increases with increases in volume of the liquid E. None of the Above
Answer:
increase with increases in temperature
Explanation:
please mark me brainleast
anyone know valency of phosphide and phosphite please tell me and also they are not same .If you know can i get their symbol too please
i found this. there's more coming up
two example of solid -solid solution
Answer:
Steel — in steel, there is a solid-solid solution of iron and carbonBrass — in brass, there is a solid-solid solution of zinc and copper.i got the total but can’t get these ???
Answer:
Volume of heptane in cylinder = 51.2mL
Volume of water = 33mL
Explanation:
Density(g/mL) = mass/ Volume
》Volume = mass/ Density
Please prompt me if I'm wrong in my workings. Hope this helped.
Chemical changes can change which properties of a substance?
Group of answer choices
Reactivity
Color
Malleability
All of the above
Answer:
» Reactivity and color
Explanation:
though color is very minor answer because it also relates to a physical property.
[tex].[/tex]