Which statements correctly describe chemical reactions? Select all that apply.
Answers
Answer:
The statements that correctly describe chemical reactions are
A. If the reactants include 5 atoms of Fe, then the products must include 5 atoms of Fe.
C. If the reactants include an aluminum atom, then the products must include an aluminum atom.
E. If there are a total of 15 atoms in the reactants, there must be a total of 15 atoms in the product.
Explanation:
In a chemical reaction, reactants are the elements or compounds that react to give a particular product(s). The reactants are the substances that start the chemical reaction and they are found at the left hand side of the chemical equation. While the products are found at the right hand side of the chemical equation and they are seen at the end of the reaction.
In chemical reaction, the number of atoms that starts the reaction remains the same. That is the same number of atoms is seen in the products. This follows the law of conservation of matter - which postulates that matter cannot be created or destroyed.
But in a chemical reaction, number of molecules are not conserved.
The statements that correctly describe chemical reactions are:
A. If the reactants include 5 atoms of Fe, then the products must include 5 atoms of Fe.
C. If the reactants include an aluminum atom, then the products must include an aluminum atom.
E. If there are a total of 15 atoms in the reactants, there must be a total of 15 atoms in the product.
Chemical Reaction:A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same.
Thus, the statements that are true for a chemical reactions are A, C and E.
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Related Questions
PbS+FeN → Fe2S3 + Pb3N2
Can someone please valence this for meeeee
Answers
Answer:
html
Explanation:
im in web tech
What does each row (across) have in common?
Answers
Using the balanced equation given below, calculate the number of moles of KCIO3 that should be reacted to produce 5.50 moles of KCI. ___ moles KCIO3
*your answer should be written as X.XX
2KCIO3 —> 2KCI + 3O2
(Please answer asap!)
Answers
Answer:
5.50 mil KCI * 2 mol KCIO3 / 2 mil KCI
I don’t know the answer, but my teacher gave me the steps to solve it...
Explanation:
!please help me if u can asap!ty!
1. How many moles of potassium are present in 4.23 x 10^25 potassium atoms? (show solution)
Answers
Answer:
70.27 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.23 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 70.265780...[/tex]
We have the final answer as
70.27 molesHope this helps you
Why is human waste hazardous when it enters the water system? for London and Ancient Rome?
I will mark as brainliest
Answers
What is the definition of epinephrine?
a stress hormone
a secretion of the synapses
a signal in the frontal lobe
a sex hormone
Answers
Answer:
a stress hormone is epinephrine
In which layer of Earth's atmosphere does outer space begin..?
A. ) Stratosphere
B. ) Mesosphere
C. ) Thermosphere
D. ) Troposphere
Please post a real answer.
Answers
Answer:
Option C
Explanation:
Because of how low the air density is, most consider it as entering outer space when you enter into the "Thermosphere" or option C. The Thermosphere is approximately 800 kilometres in the sky right above the Mesosphere and the Stratosphere which most fighter jets maximum height is.
Hope this helps.
In support of the Thirteenth Amendment, President Lincoln argued that
slavery did not impact the Civil War.
slavery should be made illegal everywhere.
slavery should be allowed in the South only.
slavery should be allowed in the North only.
Answers
Answer:
should be made illeagl everywhere
Explanation:
i took the test
Abraham Lincoln believed that American democracy meant equal rights and equality of opportunity. According to him, slavery is wrong both morally and politically. He said that slavery should be made illegal everywhere. The correct option is B.
What is Thirteenth Amendment?The 13th Amendment to the U.S constitution ratified in 1865 in the aftermath of the civil war, abolished slavery in the united states. The 13th Amendment states that ''Neither slavery nor involuntary servitude, except as a punishment for crime shall exist within the united states.
The term slavery indicates the ownership of a person as property, especially in regards to their labor. A slave is a person who is owned by another person or is forced to work against their own will.
Lincoln's position on slavery in the united states is one of the most discussed aspects of his life. Lincoln frequently expressed his moral opposition to slavery in public and private.
Thus the correct option is B.
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Li+ is an ion that has lost 1 electron in order to have a full valence shell, making Li+ a cation. What charge does the element Be (beryllium) hold? Predict what elements will bond with Be in order for it to reach stability.
Answers
Answer:
See the answer below
Explanation:
Beryllium forms an ion with 2 electrons in its outermost shell. Hence the charge on the element is 2+, that is, Be2+. In order for Be to form a stable bond with another element, such an element must have a deficit of electrons in its outermost shell. Beryllium will have to donate its 2 electrons to this element for its self-stability.
what is the difference between a crescent moon and a gibbous moon?
Answers
Answer:
A crescent moon is any time less than half the moon is lit by the sun. A crescent moon is going from the third to first quarter. A gibbous moon is any time more than half the moon is lit by the sun.
Explanation:
For dessert, she prepares to bake a delicious apple pie. During one of the steps, she
notices an example of a chemical change. Which one is it?
O heating sugar to make caramel
softening butter
O folding a sheet of aluminum foil
dicing an apple
Answers
Answer:
heating the sugar
Explanation:
Answer:
softening butter...
Explanation:
that sounds the best because the butter be melting
There are______sulfur atoms and________hydrogen atoms in 100 molecules of C4H4S2.
Round to the one's place.
Answers
Answer:
200 sulphur atoms
400 H atoms
Which soil develops in the wettest climate?
Answers
Answer:
Prairie
Explanation:
because it grows in the same type of climate, its amount of humus. sorry if its wrong I am not good with chem but i hope its right :)
What type of weather fronts are close to New York
Answers
The climate of New York is continental, with cold winters and hot summers. The daily average temperature ranges from 0.5 °C (33 °F) in January to 24.5 °C (76 °F) in July.
(hope this helps ^^)
The atomic number of an element is 11. What is the likely arrangement of the valence and core electrons in a neutral atom of this element?
Answers
Answer:
The correct answer is 10 core electrons and one valence electron.
Explanation:
The electrons in an atom, which are not valence and do not take part in chemical bonding are known as core electrons. The core electrons and the nucleus of an atom produces the atomic core. These core electrons are held tightly with the nucleus. On the other hand, the outer shell electrons, which are associated with an atom and take part in the generation of a chemical bond is the outer shell is open are known as valence electrons.
In the given question, the atomic number of an element is 11, thus, the electronic configuration will be,
1S² 2S² 2P⁶ 3S¹
Hence, there is only one valence electron and 10 core electrons.
Convert 9.3 moles of KBr to grams.
Answers
Answer:
119.0023 grams
Explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KBr, or 119.0023 grams.
The mass of one mole of KBr is 118 grams. Hence, the mass of 9.3 moles of KBr is 1097.4 grams.
What is potassium bromide?Potassium bromide is an ionic compound formed from combination of potassium and bromine atom involving the loss of electron from the potassium metal to the bromine atom.
The atomic mass of potassium (K) = 39 g/mol
atomic mass of Br = 79 g/mol
Hence, the molar mass of KBr = 79 + 39 = 118 g/mol
Therefore , the mass of one mole of KBr is 118.
The mass in grams of 9.3 moles of potassium bromide is thus, 9.3 times the mass of one mole of KBr. Thus,
mass of 9.3 moles = 9.3 × 118 = 1097.4 g.
Therefore, the mass in grams of 9.3 moles of KBr is 1097.4 g.
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Which is the correct formulae for ammonia
Answers
Answer:
NH3
Explanation:
explain why the troposphere has a larger total mass in the stratosphere even though the stratosphere so much bigger
Answers
Answer:
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water.
Explanation:
What is the relationship between a chemical equation and a chemical reaction? What are reactants and products in a chemical equation?
Answers
Answer:
A chemical reaction occurs when reactants are converted into products. A chemical equation is a representation of a chemical reaction using chemical symbols. The chemical equation also indicates the physical state of the reactants and products. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Explanation: because UwU
A chemical equation is an expression that gives the identities and quantities of a chemical reaction. A chemical equation shows the reactants on the left side and the products on the right which are separated by an arrow.
What is the chemical equation?A chemical equation is the representation of a chemical reaction in terms of symbols of the substances. A chemical equation consists of reactants participating in the reaction, formed products, and an arrow showing the direction of the chemical reaction.
The equation in which the number of atoms of substances is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass follows by a balancing of a chemical equation. According to this law, in a chemical reaction, the mass can neither be created nor destroyed.
By obeying this law, the total mass of the elements present on the reactant side should be equal to the total mass of elements present on the product side in a balanced chemical equation.
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Bullets have only class characteristics, not individual characteristics.
A. True
B. False
Answers
Answer:
B false
Explanation:
Which of the following electrolytes would you use to electroplate silver (Ag)
on iron (Fe)?
A. CuCl2
B. FeSO4
C. Zn(CIO3)2
D. AgNO3
Answers
Answer:
D. AgNO3
Explanation:
a-p-e-x
The correct answer is D or AgNO3.
As Mia mixed two substances in a test tube, she noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, what was most likely occurring inside the test tube?
The two substances underwent a physical change
The two substances were melting
A new substance was forming
A change in the mass of the two substances
Next
Previous
9:15 AM
11/18/2020
RI
(hp
Answers
Answer:
A new substance was forming
Explanation:
Two types of changes are undergone by substances involved in a reaction. They are physical changes and chemical changes. Physical changes are those changes that does not involve the synthesis of a new product. On the other hand, CHEMICAL CHANGES alters the chemical composition of the substances involved, and hence, new substances are formed.
Chemical changes are usually characterized by change of temperature, color change, evolution of a gas etc. According to this question, Mia mixed two substances in a test tube and noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, a CHEMICAL CHANGE, LEADING TO THE FORMATION OF NEW SUBSTANCE, HAS OCCURRED.
the sun provides the earth with
Answers
Answer:
heat and light
Explanation:
Answer:
Sunlight, and weather
Explanation:
Pls mark brainliest if this helps
CaCO3 Calcium oxide and carbon dioxide
Answers
Answer:
Explanation:Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room ...
a night when the temperature is 22°C
Answers
Answer:
what is the question? :)
35 POINTS!!!!
Four forces are exerted on an object as shown below: A square is shown with an arrow pointing up labeled 3 N, an arrow pointing right labeled 2 N, an arrow pointing down labeled 4 N and an arrow pointing left labeled 2 N In which direction will the object move? Up Down Left Right
Answers
Answer: Down
Explanation: There is more force pulling on the object
Is water wet? A. yes B.no C.Idk
Answers
Answer:
C
Explanation:
when in doubt pick C...
Which characteristic describes the troposphere?
PLS HELP
Answers
Answer:
hope it helps..
Explanation:
The troposphere forms the lowest level of the Earth's atmosphere, extending down to the surface of the Earth. This layer also features the heaviest weight of all Earth atmosphere layers, comprising approximately 75 percent of the total atmospheric weight. The troposphere varies in thickness and height around the world.
Sort the metric system prefixes into the correct order, smallest to largest.
deci-
centi-
deca-
hecto-
milli-
kilo-
Answers
Answer:
mili
hecto
deci
deca
centi
kilo
Explanation:
Answer:
milli-
centi-
deci-
deca-
hecto-
kilo-
How does understanding chemistry help us in the real world?
O A. It helps us know right from wrong.
O B. It helps us make informed decisions.
O C. It helps us understand scientists.
O D. It keeps us from doing dangerous things.
Answers
Answer:
D
Explanation:
It indeed does keep us from doing dangerous things, considering the fact that chemistry is done everywhere.
Answer:B
Explanation: I just took the quiz