Answer:
Try:
1. How many atoms are in 6.5 moles of zinc?
6.5 moles 6.02 x 1023 atoms = 3.9 x 1024 atoms
1 mole
2. How many moles of argon are in a sample containing 2.4 x 1024 atoms of argon?
2.4 x 1024 atoms of argon 1 mole = 4.0 mol
6.02 x 1023 atoms
3. How many moles are in 2.5g of lithium?
2.5 grams Li 1 mole = 0.36 mol
6.9 g
4. Find the mass of 4.8moles of iron.
4.8 moles 55.8 g = 267.84 g = 270g
1 mole
Explanation:
i think i did it about right..?? :-(
HELP I HAVE TO SUBMIT IN 5 MINS!!!!!!! :( I HAVE NO IDEA!!!
ANSWER ASAP What are the ions present in the compound MgO? * 1
(1 Point)
Mg2+ and O-
Mg2- and O2+
Mg+ and O-
Mg2+ and 02-
Answer:
mg+ and O-
Explanation:
HOPE IT HELPS
Which way of preparing food models a physical change that happens to food within the digestive system?
Select one:
Freezing juice in an ice-pop mold
Frying an egg in a skillet
Grinding fruit in a blender
Burning a marshmallow over a flame
Answer:
im pretty sure its Frying an egg in a skillet
im so sry if im wrong have a nice day/night (:
What Phase is water at 120 degrees Celsius?
Help, and fast! I really need an answer to this.
Answer:
Explanation:says these bars are like co vid i get em right off teh bat
It has been raining for several days. Overnight, the temperature dropped below the freezing point. Travel is now hazardous due to ice forming on the roadways.
This is an example-
Answer: physical change
Explanation:
The solids and liquids with the strongest intermolecular forces of attraction will have the
lowest melting and boiling points.
a. TRUE
b. FALSE
what would be the colour of litmus in sodium carbonate?
will make brainliest
Answer:
the color of the litmus paper will turn into blue color because sodium carbonate is basic in nature
someone please give me a sentence using “chemical bond”
Answer:
Rust, iron oxide, is weak mechanically although its chemical bonds are strong.
Explanation:
May someone pls help me with this!
Answer:
Explanation:
1. Chemistry
2. Atoms
3. Anode
4. Cathode
How does the ionosphere help radio transmission?
Explanation:
ionosphere can reflect radio waves directed into the sky back toward the Earth
The age of the seafloor __________as you move away from the mid ocean ridges to deep ocean trenches
A decreases
B increases
C does not change
Answer:
stays the same
Explanation:
because the ocean floor usually doesn't spread instead the ocean floor plunges into deep under water canyons called deep ocean trenches.
Calculate the specific heat of glass from the following data. The temperature of a piece of glass with a mass of 65 g increases by 26°C when it absorbs 840 J of heat energy.
Answer:497J/kg/K
Explanation:
Use the equation: Q=mS◇T
According to specific heat capacity, the specific heat of glass is 0.4970 J/gK.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
Substituting values in above equation, c=Q/mΔT, C=840/65×26=0.4970 J/gK.
Thus, the specific heat of glass is 0.4970 J/gK.
Learn more about specific heat capacity,here:
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Name the three types of adaptations
Answer:
behavioral, physiological, structural
Explanation:
hi Hope's this helps lapras
I don't know what to do about this now. I like her a lot; I don't want to just give up on this because I see relationship potential with this girl. And I feel she genuinely does enjoy the time she spends with me too.
Answer:
Awe ...
Explanation:
what are three uses of oxygen ?
Answer:
Production Of Steel Plastics and textiles
Explanation:
It is many more etc
In a laboratory demonstration, a balloon filled with methane and oxygen was exposed to a flame. The result was a brief, large flame. The students were asked to formulate an equation for the reaction. One answer is below. (3 points) Is this equation correct? Explain your reasoning.
Answer:
CH4(g) + 2O2(g) -------> CO2(g) + 2H2O(g)
Explanation:
Even though the question is incomplete because the equations are missing. However, one thing that is clear from the question is that the reaction is a combustion reaction.
A combustion reaction is a type of reaction that produces heat and light. The mixture of methane and oxygen yielded a brief, large flame which shows that combustion has taken place according to the equation shown above.
Which of the following statements are true?
1. The number of protons in an element is always the same for all
neutral atoms of that element.
II. The number of electrons in an element is always the same for all
neutral atoms and ions of that element. .
III. The number of neutrons in any element is always equal to the
number of protons of that element.
IV. The number of neutrons in an element can sometimes vary -
resulting in the formation of an unstable isotope that is
slightly
more (or less) massive than the stable atom of the same element.
Answer:
roman number3
Explanation:
9.25x10^-8 x6.40x10^3 in scientific equation
Answer:
5.92E-4 or 5.92x10^-4
Explanation:
which of the below would result in rearrangement of atoms at molecular level
a) salt dissolved in water
b) broken tree branches
c) gasoline combusts in an engine
d) steam rising from hot pavement
The best answer is
A) The atoms in the mineral get rearranged
Explanation:
Both the stomach and the small intestine are involved in the digestion of food.
The churning of food by stomach muscles and peptidase enzymes in the small
intestine both break food molecules into smaller molecules.
Which statement best describes changes to food during digestion?
Answer: I think the answer is The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.
Explanation: Because the muscles would make the food smaller and the enzymes have a chemical change to it because it changes the molecules in the food.
The chemical processes in food digestion results in the formation of new
substances.
The statement that best describes the changes in food during digestion is;
The churning of the food is a physical process, which results in physical changes while the peptidase results in chemical changes of the food.
Reasons:
The given processes in the digestion of food are;
Stomach: Food churning is the process by which the small intestine vigorously turns ingested food.
Small intestine: The action of the peptidase enzyme is to increase the rate of the digestion of food.
Therefore;
The churning of the food is a physical process, which results in physical changes while the peptidase results in chemical changes of the food.
Learn more here:
https://brainly.com/question/19792251
The possible question options obtained from a similar question online are;
The churning of the food and peptidase action both results in chemical changes.The churning of the brings about a chemical change, while the peptidase results in a physical change.The churning action brings about physical change, while the peptidase brings about chemical change.Both the churning action and the action of the peptidase result in chemical change.How have observations in the sky enabled humans to explore and travel?
Answer:
Observations of the sky allowed explorers to mark the passage of time both in hours and through the months of the year. Early astronomers also realized that the night sky does not look the same from different places on the Earth.
Write one paragraph!!!!!reasons why the minimum wage should be increased.
Answer:
There are pros and cons, I will explain mostly pros. After all the pros outweigh the cons.
Explanation:
Increasing the minimum wage can be letting people work less or earn more. This can have a major impact on the economy in America. It can reduce poverty within some families households. A con concerning this though is that people who work for low pay can lose their jobs and their family can become poor. It can also affect the federal minimum wage.
Hopefully this helped you out a lot. Please make sure to make my answer brainliest. Have a great rest of your day or night
Answer:
Minimum wage increases allow people to work less and earn more. This may have a significant influence on the American economy. It can help some families get out of poverty. People who labor for little compensation risk losing their employment and being unable to provide for their families, which is a drawback. As a result, the federal minimum wage may also be affected.
Explanation:
plzzz brainlest
In carbon dioxide, London dispersion forces are the only intermolecular forces of
attraction.
a. TRUE
b. FALSE
Answer:
true
Explanation:
CO has two C-O bonds. The dipoles point in opposite directions, so they cancel each other out. Thus, although CO₂ has polar bonds, it is a nonpolar molecule. Therefore, the only intermolecular forces are London dispersion forces.
Convert 48.5 grams of water to moles of water
Answer:
2.70 mol of water.
Explanation:
divide the given mass by the molar mass of water. 48.5 / 18.016g = 2.70 mol water.
In a chemical reaction _________ are the substances present after the reaction?
(PLEASE HELP! I NEED TO GET THIS DONE BY 11:00 PM! SOMEONE TELL ME HOW TO GIVE BRAINILIST BEACAUSE THE PERSON THAT GETS THIS I WILL GIVE BRAINALIST! BUT I DONT KNOW HOW TO SO TELL ME PLEASE! HELPPPPPPPPPPPPPPPP!)
P.S(sorry about the long yelling and again... im in middle school so I am just going to pick chemistry because I don’t know which subject this is, it just says photosynthesis)
Answer:
The substances present after the reaction are called products.
Explanation.
They are called reactants at the start of the reaction.
If 150 g of sucrose dissolved in a 1.50 L water what is the molarity of a solution
Answer:
0.2923 molar
Explanation:
M = given mass /(molar mass× volume)
150/342(1.5)
150/513
0.2923M
Which of the following best describes a pair of elements that will form an ionic bond?
A. C and H: Hydrogen easily loses electrons, and carbon gains them.
B. Li and O: Oxygen easily loses electrons, and lithium gains them.
C. P and Cl: Phosphorus easily loses electrons, and chlorine gains them.
D. Ca and Br: Calcium easily loses electrons, and bromine gains them.
(It's either A or D but I'm not sure)
Answer:
you answer would be d
Explanation:
Answer:
d, Ca and Br: Calcium easily loses electrons, and bromine gains them
Explanation:
edge 2021
(:
The atmosphere insulates the planet by trapping in
HELP!! ASAP!! WILL MARK BRAINLIEST!!!!!!!!!!!!!!!!
A silicon (Si) wafer is being fabricated by doping with boron (B) atoms. Which type of semiconductor is this?
Question 19 options:
A)
P-type
B)
Intrinsic
C)
Intrinsic and n-type
D)
N-type
According to Hund's rule, what's the expected magnetic behavior of vanadium (V)?
Question 20 options:
A)
Ferromagnetic
B)
Diamagnetic
C)
Non-magnetic
D)
Paramagnetic
Which group or groups of atoms are the only atoms with f orbitals?
Question 10 options:
A)
All noble gases
B)
All atoms heavier than barium (Ba)
C)
All atoms heavier than krypton (Kr)
D)
Lanthanides and actinides
What are the only elements that make up organic compounds?
Question 2 options:
A)
Carbon, hydrogen, oxygen, and nitrogen
B)
Germanium, hydrogen, potassium, and nitrogen
C)
Carbon, hydrogen, lithium, and silicon
D)
Silicon, hydrogen, carbon, and nitrogen
Answer:
1. P-Type, 2. Paramagnetic, 3. Lanthanides and Actinides, 4. Carbon, hydrogen, oxygen, and nitrogen
Explanation: