Explanation:
b and c statements are not true
if it helps you then plzz mark me brainliest
Answer:
B.) Smoking improves Athletic performance
Explanation:
The density of a certain type of plastic is 0.80g/cm. If a sheet of this plastic is 10.0 m long, 1.0 m wide, and 1 cm thick, what is its mass? Enter your answer in scientific notation.
Answer:
m = 8.0×10⁴ g
Explanation:
Given data:
Density of plastic = 0.80 g/cm³
Dimensions of plastic sheet = 1.0 m × 10.0 m ×1 cm
Mass of sheet = ?
Solution:
First of all we will convert the length and width into cm.
length = 10.0 ×100 = 1000 cm
width = 1.0 ×100 = 100 cm
Volume = 1000 cm × 100 cm × 1 cm
Volume = 100000 cm³
Mass of sheet:
D = m/v
0.80 g/cm³ = m / 100000 cm³
m = 0.80 g/cm³ × 100000 cm³
m = 80,000 g
m = 8.0×10⁴ g
What is the molecular geometry of CO2?
Answer:
Tetrahedral
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3) (Solid magnesium carbonate mixed in a solution of dilute hydrochloric acid. Assume the
specific heat capacity of the solution is 4.18 J/g°C. The enthalpy of the reaction is -23.4
kJ. If 1950 J of heat are released by this reaction, how many grams of Mgco, were
dissolved?
Answer: The mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.
Explanation:
We are given:
Amount of heat released = 1950 J = 1.950 kJ (Conversion factor: 1 kJ = 1000 J)
The chemical equation for the reaction of magnesium carbonate and hydrochloric acid follows:
[tex]MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2;\Delta H_{rxn}=-23.4kJ[/tex]
By Stoichiometry of the reaction:
If 23.4 kJ of heat is released, then 1 mole of magnesium carbonate is dissolved
So, when 1.950 kJ of heat is released, then = [tex]\frac{1mol}{23.4kJ}\times 1.950kJ=0.083mol[/tex] of magnesium carbonate is dissolved
To calculate the mass of the substance by given number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Moles of magnesium carbonate = 0.083 moles
Molar mass of magnesium carbonate = 84.3 g/mol
Putting values in above equation, we get:
[tex]0.083mol=\frac{\text{Mass of magnesium carbonate}}{84.3g/mol}\\\\\text{Mass of magnesium carbonate}=0.083mol\times 84.3g/mol=6.99g[/tex]
Hence, the mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.
Please Help For Brainliest
Answer: what IS THAT bro what grade are you in
Explanation:
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
Which argument best explains the charge of an atomic nucleus? NEED HELP!!!!!!!
A. An atomic nucleus is positively charged because it is composed of neutrons.
B. An atomic nucleus is positively charged because it is composed of protons.
C. An atomic nucleus is negatively charged because it is composed of electrons.
D. An atomic nucleus is negatively charged because it is composed of neutrons.
Answer:
A. An atomic nucleus is positively charged because it is composed of neutrons.
Explanation:
Which of the following options correctly balances the equation below? __HNO2 + __O2 --> __HNO3
Answer:
2HNO2 + O2 ------> 2HNO3
Explanation:
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:
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]
Best regards!
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.
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:
HURRY PLEASE!!
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
Pl help it’s for homwork
Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. Suppose 4.05 g of hydrobromic acid is mixed with 2.6 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 3 significant digits.
Answer:
.70 g of water will be formed.
Explanation:
NaOH + HBr = NaBr + H₂O
40 g 103 g 18 g
40 g of sodium hydroxide reacts with 103 g of HBr
2.6 g of sodium hydroxide reacts with 103 x 2.6 / 40 = 6.7 g of HBr
4.05 g of HBr is available so HBr is limiting reagent .
103 g of HBr reacts with NaOH to form 18 g of water
4.05 g of HBr reacts with NaOH to form 18 x 4.05 / 103 g
= .70 g of water will be formed.
In the photosynthetic reaction, which event normally occurs before the other three?
A) oxygen release
B) water absorption
C) PGAL synthesis
D) glucose formation
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
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.
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.
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
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
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
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:
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:
.........................
who created The Big Bang Theory
Useful:
Harmful:
2. Give an example of how Bacteria can be useful and harmful to man.
Answer:
normal flora useful
Explanation:
protect the skin
Answers: A-5N B-6N C-7N D-8N
Answer:
A-5N B-6N C-7N D-8NExplanation:
i hope it helps ;)
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.
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
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
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