Answer:
Explanation:
1 )
amount of heat required = mass x specific heat x rise in temperature
= 25 x 4.2 x 20 = 2100 J .
2 )
Amount of heat required
= mass x latent heat of vaporisation
= 50 x 2260 = 113000 J .
3 )
Amount of heat required in melting the ice
= mass x latent heat of fusion
= 15 x 336 = 5040 J
4)
heat released in cooling water
= mass x specific heat x fall in temperature
= 5 x 4.2 x 10
= 210 J
5 )
amount of heat required = mass x specific heat x rise in temperature
84 = mass x 4.2 x 10
mass = 2 grams .
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
Which is the best example and explanation that a physical change has occurred?
what is 43 mg into grams
Hello there :) here are the answers and hope you a GREAT Thanksgiving :)
0.043 grams
What is one danger associated with the use of hydrogen gas
Answer:
Topping the list of concerns is hydrogen burns. In the presence of an oxidizer -- oxygen is a good one -- hydrogen can catch fire, sometimes explosively, and it burns more easily than gasoline does.
Answer:
hydrogen burns
hope it helps
Which of these is an example of a physical change?
O a banana ripening in the air
hydrogen burning in the air
zinc reacting with an acid
O liquid water turning into vapor
water into vapor is the answer
Answer:
liquid water turning into vapor
Explanation:
because physical changes alter only the size
Which event most likely occurs at point V?
cooling
erosion
heating
melting
Answer: cooling
Explanation:
Answer:
cooling
Explanation:
can somebody help with this please ?
Answer:
B. Molecules of different types of atoms that are not attracted to each other.
Explanation:
On a broad basis, matter can be subdivided into pure or distinct substances and impure substances (mixtures);
Pure substances are distinct substances having the following properties:
All parts are the same throughout Composition is definite They cannot easily be separated or broken down into simpler substances by physical means. Separation by physical methods is not easy. They have a unique set of physical properties.From this criteria, we see that the second choice is nullified. This is because pure substances have their molecules attracted to each other.
Is PH3 polar or nonpolar
Phosphine is an example of a polar molecule with non-polar bonds
A baseball is thrown a distance of 20 meters. What is its speed if it takes 1 second to cover the distance?
Which terms are used to identify pure substances?
Answer:
mabey c or d
Explanation:
color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
2. The energy of motion is called
energy.
A. potential
B. electrical
C. chemical
D. kinetic
Answer:
Kinetic energy
Explanation:
Which of the following best explains why the
Gastropod is not a good example of an index
fossil?
Answer:
Since the gastropod is not unique, it cannot be an index fossil. An index fossil must be found over a wide area of the Earth. Since the gastropod is widely spread, it cannot be an index fossil.
Explanation:
7 types of motion you experience through the day.
Answer:
car is in the driveway
water is flowing in the river
a man is. walking in the road
a bird is flying in the sky
a tiger is running in the jungle
a tiger is running to eat a breakfast
How does the suns energy contribute to the movement of water in the water cycle?
Answer:Evaporation
Explanation:
The suns heat speeds the movement of water molecules, until the molecules move fast enough that they jolt out the surface of the water individually. Overtime the water gradually evaporates into water vapor.
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!
Distinguishing Types of Waves through Examples
A 2-column table with 3 rows. The first column labeled mechanical waves has entries ocean water, light waves, earthquake waves. The second column labeled electromagnetic waves has entries sound waves, radiation waves, X-ray waves.
How should the table be changed to correctly distinguish between mechanical and electromagnetic waves?
Earthquake waves and radiation waves need to change places.
Light waves and X-ray waves need to change places.
Ocean waves and X-ray waves need to change places.
Sound waves and light waves need to change places.
Answer:
Sound waves and light waves need to change places.
Explanation:
Given table:
Mechanical waves Electromagnetic waves
Ocean water Sound waves
Light waves Radiation waves
Earthquake waves X-ray waves
From the given table, to be correct, light and sound waves must change their position.
Light wave is an electromagnetic wave
Sound wave is a mechanical wave
An electromagnetic wave does not require a material medium for propagation.
Mechanical waves require material medium for their propagation.
Mechanical waves Electromagnetic waves
Ocean water Light waves waves
Sound waves Radiation waves
Earthquake waves X-ray waves
Answer:
Sound waves and light waves need to change
Explanation:
PLEASE HELP ME ANSWER THE TWO MULTIPLE CHOICE QUESTIONS!!!
ITS FOR CHEM:(
I’LL GIVE BRAINIEST:)
Answer:
4.D. 2KJ
5.B. close to 0 degree celsius
Explanation:
heat absorbed= heat given out
100g * 4.2 * (x-0)= 400g * 4.2* ( 20-x) where x is the new temp reached
then x= 20
i.e. the temperature of ice increases to 5 degree celsius and the temperature of water decreases to 5 degree celsius .
hope it helps
electronegativities of elements from Period 3 and Group 17. Fill in the missing values in the table so you can compare the electronegativities of the elements. After the table is filled in, compare the values in each column. A = B = C =
Answer:
A = 3.16
B = 1.31
C = 0.93
Explanation:
PLZ ANSWER! MULTIPLE CHOICE!! MUST BE CORRECT!! I CANNOT GET THIS WRONG.
Suggest whether water freezing is an endothermic or exothermic process. Can you explain your suggestion?
Which best describes why NH4+ can form an ionic bond with CF?
Its outermost shell gains one or more electrons from CF.
Its positive charge is attracted to the negative charge of Cr.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cr.
Answer:
Its positive charge is attracted to the negative charge of Cl-
Note: The correct question is given below:
Which best describes why NH4+ can form an ionic bond with Cl-?
Its outermost shell gains one or more electrons from Cl-.
Its positive charge is attracted to the negative charge of Cl-.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cl-.
Its positive charge is attracted to the negative charge of Cl-.
Explanation:
An ammonium ion is a positively charged ion which is composed of a molecule of ammonia and a hydrogen ion which are in a coordinate covalent bond due to the lone pair of electrons of the nitrogen atom in the molecule ammonia. The chloride ion however, has an extra electron which gives it a negative charge.
An ionic bond is formed between two oppositely charged ions by a transfer of electrons from one atom to another. It usually occurs between non-metals and metals. However, that formed between ammonium ion and chloride ion is between non-metals entirely.
Due to electrostatic attraction between the oppositely charged ions, an ionic bond is formed between ammonium ion, NH4+, and chloride ion, Cl-.
Convert the measurement into scientific notation. 1.25ml
Answer:
The number "1.25" is already at a number that shouldn't be determined using scientific notation. Do you want 1.25ml----> liters ? If so, here
Explanation:
1.25 × [tex]10^{-3}[/tex]
is the amount of liters
Hope this helps!
Have a nice day!
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When will heat transfer stop?
Answer:
Heat
Explanation:
Heat will always flow from the warmer object to the colder object. The heat transfer will stop when the two objects are at the same temperature and reach thermal equilibrium.
Hope this helps!
Answer:
when both object are the same temperature
Explanation:
Elsa is making a grilled ham-and-cheese sandwich. She uses a 20-gram slice of cheese, 40 grams of sliced ham, and two 15-gram slices of bread. After she heats the sandwich on a griddle, the cheese is melted. What will be the mass of her sandwich?
90 grams. When the state of an object changes, the mass doesn’t change.
*edited*
WILL GIVE BRAINLIEST Pam and Caroline determined the mass and volume of a piece of metal to be 34.16 g and 11.3 mL respectively. Determine the density of the metal. (Please show work and use significant figures.
Answer:
0.303kg/m
Explanation:
Density=m/v where m is mass
and v is volume
we then convert m in grams to kg
= 34.16/1000
=0.0342kg
converting ml to m
=11.3/100
=0.113m
then density=0.0342/0.113
=0.303kg/m
PLEASE HELP!!!!! NEED HELP ASAP!!!!!
Write the chemical formula for the covalent compounds below
EXAMPLE- dinitrogen trioxide= N2O3
nitrogen monoxide =
dihydrogen oxide =
diphosphorus pentoxide =
sulfur trioxide =
Answer:
down below
Explanation:
NO
H20
P4O10
SO3
1. NO
2. H2O
3. P4O10
4. SO3
Compare physical change and chemical change in terms of the arrangement of the particles and the changes in number of atoms or types of atoms?
Answer:
Don not sure if you got my last email I sent you a text but different question
Help please! Tell me which one goes where.
Answer:
human-F
chicken-D
rabbit-E
tortoise-C
salamander-B
fish-A
Explanation:
hope this helped!!
I tried my best!!
please mark me as brainliest
HAVE A GREAT DAY <3
Answer:
D Tortoise
B Salamander
A Fish
C Chicken
F Human
E Rabbits
Explanation:
I Really have an Explanation
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.
To know more about moles, visit the below link:
https://brainly.com/question/24639749
Match each form of energy with its correct description.
mechanical
involving the motion of atoms
chemical
involving electrical charges
thermal
involving the position and motion of
an object
electrical
involving energy stored in chemical
bonds
Answer
involving electrical charges: electrical
involving energy stored in chemical
bonds: thermal
involving the position and motion of
an object: mechanical
involving the motion of atoms: chemical
Explanation:
almost 100 this is right, sorry if this is wrong :)