Answer:
change
before
after
Explanation:
have a nice day :)
How many formula units are in 2.5 moles of NaCl?
Answer: 1.5 x 10 24
Explanation:
One mole of NaCl contains 6.022 x 1023 NaCl formula units
In 2.5 moles of NaCl there will be basically 5 moles of ions as per the given data.
What is a compound?A material created by joining two or more distinct elements chemically in science.
A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion.
Chemical connections that are challenging to break are created when the elements interact with one another.
2.5 mol of NaCl contains 5 moles of ions. This is due to the fact that 1 mol of NaCl contains 2 mol of ions, so you must multiply the molecular weight of the molecule by two to obtain the number of ions.
Thus, the answer is 5 moles.
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Science and technology are different, yet related, fields of study. Which action is best classified as science?
A.
making a prosthetic leg to help a person walk
B.
building houses that can withstand strong earthquakes
C.
designing a faster type of computer
D.
analyzing cells of a newly discovered species
Answer:
Option D
Explanation:
analyzing cells is something I'm doing in science class right now!
Hope this helped, have a nice day! :)
Answer:
Science and technology are different, yet related, fields of study. Which action is best classified as science?
Explanation:
What gas makes up the majority of the Earth's atmosphere
Answer: Nitrogen
Explanation: The atmosphere is actually mostly Nitrogen at 78% not oxygen.
Cells get chemical energy from food through a series of chemical reactions called _______________
Answer: oxidation reactions
Explanation:
How many moles of NaCl are present in 2.50 L of a 0.070 M solution?
a
2.8 x 10-2 moles of NaCl
b
35.7 moles of NaCl
c
1.75 x 10-4 moles of NaCl
d
0.175 moles of NaCl
Given :
Volume of NaCl solution 2.5 L .
Molarity of NaCl solution is 0.070 M .
To Find :
How many moles are present in the solution.
Solution :
Let, n be the number of moles.
We know, molarity is given by :
[tex]M = \dfrac{n}{V(in\ L)}[/tex]
So,
[tex]n = M \times V\\\\n = 0.070\times 2.5 \\\\n = 0.175\ moles[/tex]
Therefore, number of moles of NaCl is 0.175 moles.
What are two ways that atoms of different elements are different?
Answer:Explanation:Protons and other subatomic particles will be discussed a little later. The atoms of different elements are different from each other because they have different numbers of protons. The graphic below illustrates this point by showing the atoms of two elements in the containers of oxygen and hydrogen.
What is it?
Mg + O2 + Mgo
1. Decomposition
2.Double Displacement 3.Synthesis
4. Single Displacement
Answer:
The correct reaction is as follows:
2Mg + O2 → 2MgO
3. Synthesis
Explanation:
Chemical reactions are of different types depending on how they occur. One of these types is called SYNTHESIS OR COMBINATION REACTION. A synthesis reaction is that reaction in which two atoms of two elements are chemically combined to form a single molecule or compound. That is;
A + B → AB.
This is the case in this question where atoms of Magnesium (Mg) and oxygen (O) reacted to form a single compound of Magnesium oxide (MgO). Hence, it is said to be a SYNTHESIS REACTION.
Click Oil Basics to explore the natural resources needed for the production of plastics. Use the information to answer the question. Which of these ingredients is important in making plastics? carbon dioxide particulate matter natural gas plant liquids volatile organic compounds
Answer:
natural gas plant liquids
Explanation:
The ingredients that are important for the production of plastics are natural gas and plant liquids. The correct options are c and d.
What is plastic?Polymers are the primary component of a wide variety of synthetic or semisynthetic materials known as plastics. Due to their versatility and importance to civilization, plastics are a very important material. This is due to the fact that plastics can be bent and molded into a variety of objects, from plates to phones.
Radiation is to blame for this becoming possible. People who manufacture plastics can heat polymers sufficiently to allow them to bend by employing radiation. They can then be formed into a variety of things when this occurs.
Plastics are made from natural gases and liquids obtained from plants.
Therefore, the correct options are c, natural gas, and d, plant liquids.
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A gas has a volume of 25.0 mL when under a pressure of 525 mmHg. What is the new pressure when the volume has been increased to 86.2 mL while temperature remains constant?
Answer:
152.26 mmHg
Explanation:
pv=p'v'
525× 25=p'×86.2
p'=525×25÷ 86.2
p'=152.26
What happens to your hypotheses as new information is gained
Which statement best describes the relationship between igneous and metamorphic rocks?
Metamorphic rocks are formed from melting igneous rocks.
O Metamorphic rocks and igneous rocks do not follow a rock cycle
Igneous rocks must go through the sedimentary process to change into metamorphic rocks.
Igneous rocks are chemically changed into metamorphic rocks because of high temperature and pressur
Answer:
Igneous rocks must go through the sedimentary process to change into metamorphic rocks. Igneous rocks are chemically changed into metamorphic rocks because of high temperature and pressure. Metamorphic rocks are formed from melting igneous rocks. Metamorphic rocks and igneous rocks do not follow a rock cycle.
Explanation:
hope this helps!
Answer:
C
Explanation:
It's igneous rocks must go through the sedimentary process answer thing
Choose the statement that correctly describes how elements and compounds are related.
Multiple choice question.
A compound is a substance in which the atoms of two or more elements are physically combined in variable proportions.
An element is a substance in which the atoms of two or more compounds are chemically combined in a fixed proportion.
A compound is a substance in which the atoms of two or more elements are chemically combined in a fixed proportion.
Answer:
A compound is a substance in which the atoms of two or more elements are chemically combined in a fixed proportion.
Explanation:
The correct answer is that a compound is a substance in which the atoms of two or more elements are chemically combined in a fixed proportion.
A compound is a substance composed of two or more kinds of atoms joined together in a definite grouping.
The properties of a compound are distinct and different from those of the individual elements that are combined in its make - up.
There are several millions of compounds known.
An element is a distinct substance that cannot be split-up into simpler substances. They are made up of only one kind of atom.
Please HELP!! Which best describes CO2?
1)This is an ionic compound; it is named carbon
dioxide.
2)This is a covalent compound; it is named
carbon oxide.
3)This is an ionic compound; it is named carbon
oxide.
4)This is a covalent compound; it is named
carbon dioxide.
HURRY PLEASE!! An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?
A)The atom has 7 neutrons and 8 protons.
B)The atom has 7 electrons and 8 protons.
C)The atom has 8 neutrons and 7 electrons.
D)The atom has 8 electrons and 7 protons.
Help!!!! What type of compound is N2O3? And what is its name?
Explanation:
Dinitrogen trioxide is a nitrogen oxide. Nitrogen trioxide appears as a blue liquid with a sharp, unpleasant chemical odor.
Description: Dinitrogen trioxide is a nitrogen oxide.ChEBINitrogen trioxide appears as ...
Synonyms: Dinitrogen trioxideNITROGEN TRIOXIDENitrogen oxide (N2O3)10544-7...
Molecular Formula: N2O3
Molecular Weight: 76.012 g/mol
If you heat a liquid and measure the temperature at which it vaporizes (or boils) you are measuring...
A.) an atomic property
B.) a physical property
C.) a chemical property
Answer:
I believe that it is B
Explanation:
Giving brainliest please help with this question
Answer:
B
Explanation:
Is it true that the direct transfer of thermal energy between particles of matter that are touching is called conduction.
Did I get 6 and 7 correct or no?
Answer:
Yes
Explanation:
Answer: both are correct
Explanation:
What is released during Cellular Respiration?
Energy from Glucose
Energy from Chlorophyl
Energy from Protein
Answer:
energy from glucose
Explanation:
1. You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer
A) conduction
B) convection
C) radiation
You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.
What is conduction?One of the three primary methods for the transfer of heat energy is conduction. Radiation and convection are the other two methods through which heat is transferred. Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide.
In liquids and solids where particles are more closely spaced, conduction happens more easily than in gases, wherein particles are more widely spaced. When there is a significant temperature differential between both the substances that are in contact, the rate of energy transfer through conduction is increased. You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.
Therefore, the correct option is option A.
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Please help... its due today and my teacher isn't explaining very good I have 100 points will give 40 to you a brainliest and thanks answers are at the bottom but I need the work done also
Answer:
2Na2O2 + 2H2O → 4NaOH + O2 is the balanced ver of Na2O2 + H2O - NaOH + O2
Explanation:
ALL I ask is you answer correctly I'm having a bad day ! :(
Jimmy Fallon was playing with acids and bases and was trying to determine how many grams of Copper (I) Hydroxide he would need to create 48.76 grams of Copper (I) Phosphate when reacting it with Phosphoric Acid.
Answer:
i have no clue whats going on here but imma act like i do.....
Explanation:
Which equation represents a conservation of atoms?
1.
2Fe + 202 → Fe2O3
2.
2Fe + 302 → Fe2O3
3.
4Fe + 202 → 2Fe2O3
4.
4Fe + 302 → 2Fe2O3
From the options, the reaction that shows the conservation of atoms is 4Fe + 302 → 2Fe2O3.
What is conservation of atoms?The idea of the conservation of atoms is that the number of atoms on the right hand side is equal to the number of atoms on the left hand side.
In this case, we have to a reaction equation which is balanced which is 4Fe + 302 → 2Fe2O3.
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Explain Joule's law in your own words. pls help
Answer:
Joules first law is a law that expresses the relatioship between heat that is generated and the current flowing heat thats through a conductor. The second law says that internal energy is independent of volume and pressure, depending only on temperature!
Explanation:
CO2 + H20 ----> C6H1206 + 02
*
14. What are the reactants of the reaction?
Explanation:
[tex]CO _{2} \: and \: H _{2} O[/tex]
Reactants must be on the left hand side of the reaction
What’s the meaning of low metabolism
Answer:
A person with a "low" (or slow) metabolism will burn fewer calories at rest and during activity and therefore has to eat less to avoid becoming overweight.
meaning of normal metabolism-Metabolism is the process by which your body converts what you eat and drink into energy. Even when you're at rest, your body needs energy for functions such as breathing, circulating blood and repairing cells. The energy your body uses for these basic functions is known as your basal metabolic rate.
A person with a low metabolism will burn fewer calories at rest and during activity and therefore has to eat less to avoid becoming overweight.
Signs of a slow metabolism
-You have gas.
-You crave sugar.
-You keep gaining weight.
-It's tough to lose weight.
-You always feel bloated.
-You have hypothyroidism.
-You easily develop cellulite.
-Your blood sugar is too high.
Two important ways that energy is transported in the world around us is through
Explanation:
The two ways that energy can be transferred are by doing work and by heat transfer.
How would you balance this chemical equation?
Answer:
CH4 + 4Cl2 ===> CCl4 + 4HCl
Explanation:
If you are having trouble understanding how to balance equations, use chemical equation calculators and they tell you step by step.
⚠️HELP⚠️
Balance this equation
zinc ( s) + hydrogen sulfate (aq) hydrogen( (g) + zinc sulfate (aq) (hydrogen sulfate is a compound, not ion) +
Answer:
The balanced equation is :
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
