Answer:
In an exothermic reaction, the products are at a lower energy than the reactants. The difference between the energy of the reactants and the energy of the products is called the enthalpy change (∆H) of the reaction. For an exothermic reaction, the enthalpy change is always negative.
true or false
In order to calculate the relative formula mass for any compound, we sum up the products of atoms of elements multiplied by their relative atomic mass.
Answer:
TRUE
Explanation:
THE ANSWER IS TRUE
HOPE IT HELPS
Two or more different elements chemically combined
Answer:
This question lacks some parts, it should read "Two or more different elements chemically combined make up a"
The answer is a COMPOUND
Explanation:
A compound is a type of pure substance that is formed as a result of the chemical combination of two or more different elements. During this combination, the atoms of the constituent elements are chemically joined together by CHEMICAL BONDS.
An example of a compound is CaCO3, which contains the following elements: Calcium, Carbon and Oxygen. In this compound, the atoms of the above listed elements are joined together by chemical bonds to form a COMPOUND.
How does removing thermal energy from liquid water affect the molecules in the water?
Answer:
For deposition to happen, thermal energy must be removed from the gas. ... As water vapor loses thermal energy, it changes into solid frost. States of Water. Water is the only substance that exists naturally as a solid, a liquid, and a gas within Earth's temperature range.
Explanation:
State the relationship between phase changes and heat energy.
In complete sentences
Answer:
heat changes energy is by the sun
the sun gives off energy
Which of the following elements belong to the same pair?
A. Na and CI
B. Na and Li
C. Na and Cu
D. Na and Ne
Answer:
B. Na and Li
Both are group I elements.
What is the molecular geometry of CO2?
Answer:
Tetrahedral
And can u give me the brainlist I only need one to get a higher rank and thank u
yo please help. There is an image PLEASE... HELP... MEEEEE
Answer:
9. B different sounds the dog is exposed to
10. control, dependent, control, control, independent
Explanation:
how does the density of an object help scientist understand the natural world
Densities are mostly used to identify substances and to characterize and estimate the composition of many kinds of mixtures.
Identify an element on the periodic table that is chemically similar to neon(Ne).
ANSWER
Elements that are similar to neon is helium, and argon
Hope its right if not so advance sorry :)
Answer:
He
Explanation:
plato
Brenda rode a skateboard 95 meters west. It took her 20 seconds. What was
her velocity?
A. 75 m/s west
B. 18 m/s west
C. 0.21 m/s west
D. 4.75 m/s west
SUBMIT
Answer:
D. 4.75 m/s west
Explanation:
You can immediately get the answer once you know the formula for velocity.
The formula for velocity is: Velocity (V) = [tex]\frac{distance (d)}{time (t)}[/tex]The distance is 95 meters while the time is 20 seconds. All you have to do is to divide 95 meters by 20 seconds.
Let's solve:
V = [tex]\frac{d}{t}[/tex]V = [tex]\frac{95 meters}{20 seconds}[/tex]V = 4.75 meters per secondSince Brenda is going west with her her skateboard, then you have to add west as her direction.
Brenda's velocity is 4.75 m/s west.
What's the theoretical yield if 5.50 g.of Hydrogen react with nitrogen to from amonia? 3H2+N2=2NH3
The theoretical yield : 31.11 g
Further explanationGiven
Reaction
3H2+N2=2NH3
Required
the theoretical yield
Solution
mol of Hydrogen :mol = mass : Ar
mol = 5.5 g : 2
mol = 2.75
mol of Ammonia :From the equation, mol ratio of H₂ : NH₃ = 3 : 2, so mol NH₃ =
[tex]\tt \dfrac{2}{3}\times 2.75=1.83[/tex]
Mass Ammonia (MW=17 g/mol):mass =mol x MW
mass = 1.83 x 17
mass= 31.11 g
What is an example
Of a compound that contains a fluorine. Write the symbols for the chemical formula, and give the name.
Answer:
NaF sodium flouride
Explanation:
Answers: A-5N B-6N C-7N D-8N
Answer:
A-5N B-6N C-7N D-8NExplanation:
i hope it helps ;)
What is the concentration of a solution if 2.0 moles of sodium chloride is dissolved in 0.50 liter of water
4 M is the concentration of a solution if 2.0 moles of sodium chloride is dissolved in 0.50 liter of water.
What is molarity?Molarity is define as the no. of moles of solute present in per liter of solution i.e. M = n / V.
We can calculate the concentration in terms of molarity, in the question given that :
n = no. of moles of NaCl = 2 moles
V = volume of water = 0.50 L
On putting these values in the above equation, we get
M = 2 / 0.50 = 4M
Hence, 4 M is the concentration of the given solution.
To know more about molarity, visit the below link:
https://brainly.com/question/14469428
Which of the following molecules are isomers? Please look at the picture for reference
Answer:
d
Explanation:
Isomers are molecules that have the same molecular formula(the same number of each atom), but different structural formulas
in this case both have the formula C2H5O
A 0.02 molar solution of sodium chloride contains 0.1 mole of solute. What is the volume of the solution
Answer:
Volume of solution = 5 L
Explanation:
Given data:
Molarity of solution = 0.02 M
Moles of solute = 0.1 mol
Volume of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
by putting values,
0.02 M = 0.1 mol / volume of solution
Volume of solution = 0.1 mol / 0.02 M
Volume of solution = 5 L
Useful:
Harmful:
2. Give an example of how Bacteria can be useful and harmful to man.
Answer:
normal flora useful
Explanation:
protect the skin
Silver has a resistance of 0.0198 ohms. What voltage would produce a current of 100 amps? ______________
The voltage that would produce the given current is 1.98 V.
Ohm's lawThe voltage that would produce the given current can be determined by applying Ohm's law as shown below;
V = IR
where;
V is the voltage I is the currentR is the resistanceV = 100 x 0.0198
V = 1.98 V
Thus, the voltage that would produce the given current is 1.98 V.
Learn more about Ohm's law here: https://brainly.com/question/231741
5. If it's winter in the northern hemisphere, what season is it in southern
hemisphere?
Answer:
summer
Explanation:
Because the opposite of winter is summer (warm, hot)
Which of the following choices about teenagers and sex is true?
a. Over half of teenagers have sexual intercourse.
b. Teenagers who have sexual intercourse are more likely to use protection.
c. Teenage sex is more likely to involve coercion.
d. All of the choices are correct.
Answer:
D
Explanation:
.........................
Barb has a bucket of snow with a mass of 20 kg. After the snowmelts,what will most likely be the mass of the bucket of water?
Answer:
20 kg
Explanation:
the mass wont change, so it will still be 20 kg
hope this helps :)
20kgs is the right answer/choice.
Pl help it’s for homwork
Write the formula for Carbon Trioxide
Answer:
Chemical Formula: Fe2O3.
Explanation:
Iron(III) oxide, ferric iron, hematite, red iron oxide, synthetic maghemite, colcothar, or simply rust—is one of the several oxide compounds of iron, and has paramagnetic properties
The formula for Carbon Trioxide is CO₃.
In Carbon Trioxide (CO₃), one carbon atom is bonded to three oxygen atoms. The subscript "3" indicates that there are three oxygen atoms in the molecule.
Carbon trioxide (CO₃) is not a stable molecule, and it does not exist as a discrete compound. The actual chemical formula for this compound does not represent a real chemical species.
Carbon trioxide was once proposed as a hypothetical compound with a triangular cyclic structure containing one carbon atom and three oxygen atoms. However, further research and experiments have shown that this structure is not viable due to the instability and high reactivity of such a compound.
Learn more about Carbon Trioxide from the link given below.
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who created The Big Bang Theory
Speed of an object at one instant of time is the object's_____ speed.
Answer:
Instantaneous Speed
Explanation:
forgive me if its wrong
PLEASE HELP TIMED !!
question 1- draw a lewis dot diagram of O on a piece of paper. how many total electrons did you draw?
question 2- draw a lewis dot diagram of O on a piece of paper. how many Pairs of electrons did you draw?
question 3- draw a lewis dot diagram of Cl on a piece of paper. how many total electrons did you draw?
Answer:
See explanation
Explanation:
The Lewis dot structure is a representation of atoms in which the valence electrons on the atoms are shown as dots. Each dot represents a valence electron on the outermost shell of the atom.
Oxygen has six electrons on its outermost shell four of which are two lone pairs. Also, chlorine has seven electrons in its outermost shell. Six of these are lone pairs.
In the photosynthetic reaction, which event normally occurs before the other three?
A) oxygen release
B) water absorption
C) PGAL synthesis
D) glucose formation
How does atomic mass relate to the mole?
A: Atomic mass can be used to calculate the molar mass of a sample of a compound or element. The molar mass explains the number of particles in a single mole of the sample. Thus, the molar mass derived from the atomic masses of elements in the compound can be used to convert quantified amounts of a compound into moles.
B: Atomic mass can be used to calculate Avogadro’s number of a sample of a compound or element. Avogadro’s number explains the number of grams in a single mole of the sample. Thus, Avogadro’s number that is derived from the atomic masses of elements in the compound can be used to convert quantified masses into moles of the compound.
C: Atomic mass can be used to calculate Avogadro’s number of a sample of a compound or element. Avogadro’s number explains the number of particles in a single mole of the sample. Thus, Avogadro’s number, derived from the atomic masses of elements in the compound, can be used to convert quantified amounts of a compound into moles.
D: Atomic mass can be used to calculate the molar mass of a sample of a compound or element. The molar mass explains the number of grams in a single mole of the sample. Thus, the molar mass derived from the atomic masses of elements in the compound can be used to convert quantified masses into moles of the compound.
How many grams of water can be heated 71 °C by the absorption of 970 Joules?
Answer:
m = 3.3 g
Explanation:
Hello!
In this case, since the specific heat of water is defined as 4.184 J(g*°C), given the temperature change and the absorbed energy, we can compute the mass of water as shown below:
[tex]Q=mC\Delta T\\\\m=\frac{Q}{C\Delta T}[/tex]
Thus, we plug in the given data to obtain:
[tex]m=\frac{970J}{4.184\frac{J}{g\°C}*71\°C}\\\\m= 3.3g[/tex]
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You see different colors because white light breaks into different ____
(science 8th grade )
Answer:
you see different colors because white light breaks into its different component colors - red, orange, yellow, green, blue and Violet.
The dispersion of visible light into its different colors is known as dispersion
hope it helps you