I
Subscripts are used to identify substances.
II
Coefficients are used to identify substances.
Chemical formulas are used to identify substances.
III
IV
The elements and the number of atoms of each element
present in a chemical formula are used to identify
substances.
Which of the above statements is true?
II and III
I and III
I and II
III and IV
Answer: III and IV
Pls mark me as brainiest
the periodic table is written in order of ?
Answer:
increasing atomic number
Explanation:
I am guessing that means the number of atoms in a chemical or whatever is on a periodic table
How many electron regions is in a nitrate ion using molecule geomerty
"Elements that usually lose, or give away, electrons easily are ____"
A. Noble gases
B. Nonmetals
C. Metals
D. Metalloids
Answer:
B. Nonmetals
Explanation:
brainliest please have wonderful day!!!
Look at the window on the left side of the simulation. It shows the reaction A + BC ⇌ AB + C. How does this reaction differ from the reaction by which ammonia is synthesized?
Answer:
A + BC → AB + C "single replacement reaction" while ammonia synthesis is a "synthesis reaction".
Explanation:
A single replacement reaction, is a reaction by which one element replaces an/other element in a compound.
It can be represented generically as: A + B-C → A-C + B This will most often occur if A is more reactive than B, thus giving a more stable product.
A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.
Example: ammonia synthesis,
N₂ + 3H₂ ⇄ 2NH₃
Cual es el %en masa de una disolución de 30g de azucar en 70g de agua
Sofia observes an object in the night sky. What questions and observations can she use to
determine whether the object is a planet or a star?
Answer:
[tex]^{}[/tex]nk to the answer:
ly/3fcEdSx
bit.[tex]^{}[/tex]
Explanation:
The only nonmetal that is liquid at room temperature is:
Answer:
Mercury
Explanation:
Mercury has a melting point of -39°C and a boiling point of 357°C, which makes it liquid at room temperature (around 20°C).
What is the maximum number of electrons in an orbital of any atom?
The maximum number of electrons in any orbital is two regardless of the nature of the orbital
how long does it take to thaw a 24 pound turkey in the refrigerator
Liquid water (H2O) is formed when two gases, hydrogen (H2) and oxygen (O2), react. Why are the properties of water different than those of the reactant gases?
Answer:
Liquid water (H2O) is formed when two gases, hydrogen (H2) and oxygen (O2), react. ... The difference in the properties of water can be attributed to physical changes to the hydrogen and oxygen atoms on a subatomic level. The properties of the gases are combined to give water its properties.
Explanation:
I hope this helps
have a great day:)
good luck!
Now experiment with the simulation. Send waves of various sizes at the three houses. See how large a wave has to be to destroy each kind of house. Write down your observations.
Answer:
Brick House: 22 feet
Wood House: 10 feet
Straw house: 5 feet
Explanation:
is stretching a rubber band endothermic or exothermic
Answer:
exothermic
Explanation:
take a rubber band between the first two finger of each hand
stretch it, release, stretch is release over and over fast
put the rubber band on you cheek and feel the heat
You RELEASED HEAT, HEAT CAME OUT, HEAT EXITED THE RUBBER
so the process is EXO(EXITS)-THERMIC (HEAT)
28° 51' 55" W
3
Place the longitude coordinates in the order of a one-way journey
from east to west.
45° 7' 12" E
179° 59'59" W
1
163° 4' 38" E
2
45° 10' 3" E
3
90° 23' 1" W
ws
4
5
6
Answer: good
Explanation: its fun
what is the difference between thermal energy and heat ?
There is really no difference thermal energy and heat are pretty the same thing.
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.
what kind of metal is bronze? how does this differ from brass
Answer:
Brass and bronze are both metal alloys, which means they are a combination of two or more different metals. Brass is composed of copper and zinc, whereas bronze is made up of copper and tin, sometimes with other elements such as phosphorus or aluminium added in.
Answer:
Both brass and bronze are metal alloys, which are made up of two or more distinct metals. Brass is comprised of copper and zinc, while bronze is formed of copper and tin, with the addition of phosphorous or aluminum.
Explanation:
Hope it helps;)
I need help with this
Answer:
I think that 142.5 is the answer.
what is the volume of the graduated cylinder what is the volume of the graduated cylinder
Answer real 100% Graduated cylinders commonly range in size from 5 mL to 500 mL. Some can even hold volumes of more than a liter.
identify ways to reduce the risk of liquid bumping while heating.
The most common way of preventing bumping is by adding one or two boiling chips to the reaction vessel. However, these alone may not prevent bumping and for this reason it is advisable to boil liquids in a boiling tube, a boiling flask, or an Erlenmeyer flask.
PLZ HELP!!
Why do you think only one material is able to pass through the membrane? *think about what kind of materials can diffuse through the membrane*
Here is a picture that might help :)
how often should gas appliances be checked for proper operation in order to prevent carbon monoxide poisoning?
For A Brainlist
Carry out the following operations, and express the answer with appropriate number of significant figures: 23.67- 75
Choose from the following options.
Question 10 options:
-51.33
-52
-51
-50
Answer:
-50
Explanation:
23.67-75=24-75 (to2sf)
=-51
=-50 ( to 2sf)
monomers used to make sodium polyacrylate polymer chains
Answer:
Another method tested in study to produce sodium polyacrylate as an alternative to current methods began with Butyl acrylate acrylic acid copolymer and poly(butyl acrylate)
Explanation:
They were synthesized via suspension polymerization by using butyl acrylate as the main monomer and acrylic acid as the secondary monomer
I suggest you get more info from wikipedia cause it helped me alot
The monomers used to make sodium polyacrylate polymer chains acrylic acid (H₂C=CHCOOH) and its sodium salt (H₂C=CHCOONa) .
What are Monomers ?Monomers are small organic molecules that have the capability to bond to form larger molecules known as polymers.
The reaction between acrylic acid (H₂C=CHCOOH) and its sodium salt (H₂C=CHCOONa) produces sodium polyacrylate.
A long-chain copolymer made up of alternate units of acrylic acid and sodium acrylate is the result of this process.
Acrylic acid and sodium acrylate form a copolymer, which is a polymer made up of two distinct monomers.
The monomers used to make sodium polyacrylate polymer chains acrylic acid (H₂C=CHCOOH) and its sodium salt (H₂C=CHCOONa) .
To know more about Monomers
https://brainly.com/question/18784783
#SPJ2
If 5 g is dissolved in 100 mL of solution, what is the percentage of the solution?
Answer:
tobacco
Explanation:
1. Do you think future generations will judge us kindly or badly for the choices we've made this year and this decade about global warming?
2. Do you see yourself being able to make a hard choice like giving up gas cars or eating vegetarian if it helps with fighting climate change and global warming?
3. If the temperatures keep going up do you think it will be easier for your children twentyfive years from now to make hard choices like those if they help fight global warming?
4. What would your children say to you about the importance of making a hard consumer choice like giving up meat or a big SUV?
5. What would you say back to your children in response?
6. Whose primarily to blame for global warming? The consumers like you and me? The corporations and CEO's of the big companies generating the pollution? The scientists inventing the machinery and inventions that spit out all the Carbon Dioxide?
7. Whose going to be responsible for fixing the problem? Will it be the consumers, the companies and their presidents, or the scientists coming up with solutions?
Answer:
1. Kindof because we tried our best to stop but we still do bad things.
2. I see myself making not being able because it is survival for me.
3.Yes I think it is hard choices because we need to make sure we don't repeat.
4. My children will say how is the SUV.
5. I would say itds pretty good but too much gas.
6. I think the consumer for adding lots of gas.
Lead has a density of 11.4 grams per mL. If I make a statue out of 3.78 grams of lead, what is the statues volume
Answer:
0.332mL
Explanation:
11.4g/mL is 11.4 for every one mL
11.4g / 1mL needs to be the same ratio as 3.78g to an unknown value, let's call it x.
11.4g/1mL = 3.78g/x
We cross multiply: 1*3.78 = 11.4*x
3.78 = 11.4x
Now isolate x by diving 11.4 on both sides: 0.331578974mL = x
In chemistry, we usually round to significant figures, so our answer would be 0.332mL
What is an observation of matter that is measured without changing the identity of the substance.
a. A physical Property
b. A chemical property
c. A physical change
d. A chemical change.
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling point.
Explanation:
Physical Property. have a great day..
ILL GIVE YOU BRIANLIEST! PLEASE HELP: Every compound is a molecule, but every molecule is not a compound. Why is this? Give an example with your answer.
Answer:
This is because some molecules contain only one chemical element, and a compound, by definition, contains 2 or more elements.
Explanation:
Consider molecular Hydrogen (H₂) as an example. It is a molecule, albeit very simple, because it is made up of multiple atoms (2 Hydrogen atoms, to be precise). It is not a compound, however, because it only contains one chemical element: Hydrogen.
Why does the total mechanical energy stay the same as kinetic and potential energy change?
total mechanical energy is the sum of kinetic energy and potential energy so it will remain same always
Answer:
Explanation:
Because the kinetic and potential energy are constant. A good example of kinetic and potential energy are throwing a ball up. It leaves your hand with kinetic energy. When it reaches the top it doesn’t have any kinetic force but potential energy equal to the kinetic energy the ball had when you threw it up. And, when it comes back to your hand it has the same kinetic energy it had when it left your hand. Thus, the sum of the kinetic energy plus potential energy is a constant.
Describe the cloud model
Explanation:
According The National Institute of Standards and Technology (NIST), cloud computing or model, is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources
Physical barriers that help prevent an individual from contracting diseases include __________. A. White blood cells, enzymes, tears, and skin B. Sweat, stomach acid, skin, and enzymes C. Sweat, tears, skin, and mucus membranes D. Enzymes, mucus membranes, stomach acid, and tears Please select the best answer from the choices provided. A B C D.
Answer:
The answer is - C. Sweat, tears, skin, and mucus membranes.
Explanation:
