Answer:
Explanation:
ABC Powder: sprays a very fine chemical powder. This acts to blanket the fire and suffocate it. Class A, B, C fires
Carbon dioxide: extinguishes CO2. By doing so, it removes oxygen from the fire, effectively suffocating it of oxygen. Class B fires
Foam: spray a type of foam that expands when it hits the air and blankets the fire. This prevents the vapors from rising off the liquid to feed the fire, thus starving it of fuel. Class A and B
Water: releases microscopic water molecules that fight the fire on a variety of levels. the level of oxygen in the air is decreased, which helps to suffocate the fire. Class: most all
also, your fire classes:
Class A: freely burning, combustible solid materials such as wood or paper
Class B: flammable liquid or gas
Class C: energized electrical fire (energized electrical source serves as the ignitor of a class A or B fire – if electrical source is removed, it is no longer a class C fire)
Class D: metallic fire (titanium, zirconium, magnesium, sodium)
Class K: cooking fires – animal or vegetable oils or fats
Which of the following is the correct definition for electronegativity?
А. The amount of energy to attract or bond electrons
В. The amount of energy required to remove an electron
C. Half the distance between the nuclei of two bonded atoms
D. All of the above correctly explain electronegativity
Answer:
[tex]\color{Blue}\huge\boxed{Question} [/tex]
Which of the following is the correct definition for electronegativity[tex]\color{Blue}\huge\boxed{Answer} [/tex]
А. The amount of energy to attract or bond electronsWhat would this mechanism look like?
Answer:
Not sure sorry :(
Explanation:
Which of the following is not a cation?
Iron (III) ion
sulfate
Ca²⁺
Mercurous ion
Answer:
sulfate
Explanation:
because it is anions
Which combination of atoms is most likely to produce a compound
with ionic bonds?
Answer: In an ionic bond, one atom donates an electron to another atom. This stabilizes both atoms. Because one atom essentially gains an electron and the other loses it, an ionic bond is polar. In other words, one atom in the bond has a positive charge, while the other has a negative charge. Often, these atoms dissociate into their ions in water. Atoms that participate in ionic bonding have different electronegativity values from each other. If you look at a table of electronegativity values, it is apparent ionic bonding occurs between metals and nonmetals. Examples of compounds with ionic bonds include salt, such as table salt (NaCl).
One gallon of gasoline (C8H18) weights about 6.3 pounds. Burning gasoline with excess of oxygen forms water and carbon dioxide. When 3.1 gallons of gasoline burn, how many pounds of CO2 emit into the air?
FW: C = 12; H = 1; O = 16.
Answer:
60 pounds of CO₂ are emited into the air
Explanation:
The combustion of gasoline occurs as follows:
C₈H₁₈(l) + 25/2O₂(g) ⇄ 8CO₂(g) + 9H₂O
Where 1 mole of gasoline produce 8 moles of CO₂
To solve this question we must find the moles of gasoline in 3.1 gallons. 8 times these moles are the moles of CO₂ produced. With the moles of CO₂ we can find its pounds as follows:
Pounds gasoline:
3.1 gallons * (6.3 pounds / gallon) = 19.53 pounds
Grams gasoline:
19.53 pounds * (453.592g / pound) = 8859g
Moles gasoline -Molar mass C8H18: 114.23g/mol-
8859g * (1mol / 114.23g) = 77.55 moles gasoline
Moles CO₂:
77.55 moles gasoline * (8 mol CO₂ / mol Gasoline) = 620.4 moles CO₂
Mass CO₂ - Molar mass: 44.01g/mol-
620.4 moles CO₂ * (44.01g / mol) = 27304g CO₂
Pounds CO₂:
27304g CO₂ * (1lb / 453.592g) =
60 pounds of CO₂ are emited into the airMuscles and bones work together when muscles move bones through contracting and
relaxing.
A.true
B.false
I think it's true.
Explanation:
Muscles move bones through contracting and relaxing
help me to solve this
Answer: The average atomic mass of nitrogen is 14.0066 amu
Explanation:
Mass of isotope N-14 = 14.00307 amu
% abundance of isotope N-14= 99.64% = [tex]\frac{99.64}{100}[/tex]
Mass of isotope N-13 = 15.0001 amu
% abundance of isotope N-13= (0.36)% = [tex]\frac{0.36}{100}[/tex]
Formula used for average atomic mass of an element :
[tex]\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})[/tex]
[tex]A=\sum[(14.00307)\times \frac{99.64}{100})+(15.0001)\times \frac{0.36}{100}]][/tex]
[tex]A=14.0066amu[/tex]
Therefore, the average atomic mass of nitrogen is 14.0066 amu
The psalm which begins the lord is my shepherd is the ______. (what number ?)
Answer:
Psalm 23Explanation:
Psalm 23 vs 1 : The Lord is my Shepherd, I shall not want.
Answer:
Psalms 23:1The LORD is my shepherd ; i shall not want.Hope it helps#CarryOnLearning
Gram for gram, fats in food have much more chemical energy than sugar. One component of fat is stearic acid, C18H36O2. When a sample of 1.02 g of stearic acid was burned completely in a bomb calorimeter, the temperature of the calorimeter rose by 4.26oC. The heat capacity of the calorimeter was 9.43 kJ/oC. Calculate the molar heat of combustion of stearic acid in kilojoules per mole.
Answer:
[tex]\mathbf{-1.12 \times 10^4 \ kJ/mol}[/tex]
Explanation:
Given that:
mass (m) of the sample = 1.02 g
number of moles of stearic acid [tex]=\dfrac{mass}{molar mass}[/tex]
[tex]= \dfrac{1.02 \ g}{284.49 \ g/mol} \\ \\ = 0.000358 \ moles[/tex]
The change in temp. [tex]\Delta T = 4.26^0 \ C[/tex]
heat capacity of the calorimeter (c) = 9.43 kJ/° C
Thus, heat due to reaction = cΔT
= 9.43 kJ/° C × 4.26° C
= 40.17 kJ
The heat in kJ/mol = [tex]\dfrac{40.17 \ kJ}{0.00358 \ mol}[/tex]
= 11204.23 kJ/mol
= 1.12 × 10⁴ kJ/mol
As a result of the reaction is exothermic, the heat reaction of the combustion is:
[tex]\mathbf{-1.12 \times 10^4 \ kJ/mol}[/tex]
23. Forces accelerate objects. Newton's second law state that force equals ______times?
Answer:
F = ma, or force is equal to mass times acceleration.
A 5.0L balloon in a freezer is at a temperature of - 50 degrees * C has a pressure of 800 mm Hg. What will be the new pressure if the balloon is taken out and placed in a warm room (Temperature 37°C) and the volume expands to 7.0 L?
Answer:
794 mmHg
Explanation:
We are going to be using the Combined Gas Law for this problem as well. Just to refresh out memory - the Combined Gas Law expresses the relationship between pressure, volume, and temperature (in KELVIN) of a fixed amount of gas. The equation itself? Right here: [tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Now, looking at the problem, let's assign the values to its corresponding variable:
P1 = 800mmHg; V1 = 5.0L; T1 = -50°C + 273 = 223K
V2 = 7.0L; T2 = 37°C + 273 = 310K; P2 = ?
We are looking to find the new pressure, a.k.a. P2. So, let's plug and chug the values into the equation.
Set up: [tex]\frac{(800 mmHg)(5.0L)}{223K} = \frac{(7.0L)(P_{2})}{310K}[/tex]
==> [tex]\frac{(800 mmHg)(5.0L)}{223K} * 310K = (7.0L)(P_{2})}[/tex]
==> [tex]P_{2} = \frac{(800 mmHg)(5.0L)}{223K} * \frac{310K}{7.0} }[/tex]
==> [tex]P_{2} =[/tex] 794.36 = 794 mmHg
A gas under a pressure of 9.86 kPa and at a temperature of 75°C occupies a 500.0L container. How many moles of gas are in the container?
Answer:
1.7 mol
Explanation:
This is an ideal gas problem. So many units! That's the tip-off usually.
PV=nRT
First convert kPA to atm 1 atm=101.3 kPA so 9.86/101.3 = .097311 atm
(.097311 atm x 500L) = n · 0821 L·atm/mol·K · 348K
Do your multiplication then divide to get n alone and you should get 1.7 mol
How much water would I need to add to 700 mL of a 2.7 M KCl solution to make a 1.0 M solution?
Answer:
[tex]1190\ \text{mL}[/tex]
Explanation:
[tex]M_1[/tex] = Initial Concentration of KCl = 2.7 M
[tex]V_1[/tex] = Volume of KCl = 1 M
[tex]M_2[/tex] = Final concentration of KCl = 1 M
[tex]V_2[/tex] = Amount of water
We have the relation
[tex]M_1V_1=M_2V_2\\\Rightarrow V_2=\dfrac{M_1V_1}{M_2}\\\Rightarrow V_2=\dfrac{2.7\times 700}{1}\\\Rightarrow V_2=1890\ \text{mL}[/tex]
The amount of water that is to be added is [tex]1890-700=1190\ \text{mL}[/tex].
SO2 + PCL5 → SOCL2 + POCL3
What mass of SOCL2 is produced when 1.35 g SO2 react with 2.75 g PCL5
Answer:
2.34
Explanation:
Describe the four levels of heat preservation used by the food industry.
What is happening to the electrons between several atoms of Copper?
A.nothing happens to the electrons
B.the electrons become delocalized and form a "sea"
C.they are shared between two atoms
D.the electrons are transferred from one atom to another
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
B.the electrons become delocalized and form a "sea"
Pls help I’ll brainlest and add extra points
Name 3 ways you can keep our community healthy?
Answer:
1. Practice healthy habits with kids in your life. ...
2. Engage in your school's efforts to encourage healthy practices. ...
3. Learn more about the decisions local officials are making that impact your environment. ...
4. Give back healthy options to your community.
Explanation:
explain how temperature and mass affect the appearance of stars
Answer:
If the star has smaller mass than the Sun, it can fuse hydrogen into helium for at least a trillion years. The larger a star, the shorter its life because it fuses hydrogen into helium much more quickly. A star whose mass is more than 20 Suns will run out of hydrogen in only a few hundred million years.
17.4 mL of unknown H2SO4 solution was titrated by 0.20 M of NaOH. 41.51 mL of that NaOH solution was consumed to exactly completely neutralize the acid. What is the original molarity (in M) of the unknown H2SO4 solution?
Answer:
0.24 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation,
The mole ratio of the acid, H₂SO₄ (nₐ) = 1
The mole ratio of the base, NaOH (n₆) = 2
Finally, we shall determine the molarity of the acid. This can be obtained as follow:
Volume of acid, H₂SO₄ (Vₐ) = 17.4 mL
Molarity of base, NaOH (M₆) = 0.20 M
Volume of base, NaOH (V₆) = 41.51 mL
Molarity of acid, H₂SO₄ (Mₐ) =?
MₐVₐ / M₆V₆ = nₐ / n₆
Mₐ × 17.4 / 0.2 × 41.51 = 1 / 2
Mₐ × 17.4 / 8.302 = 1 / 2
Cross multiply
Mₐ × 17.4 × 2 = 8.302
Mₐ × 34.8 = 8.302
Divide both side by 34.8
Mₐ = 8.302 / 34.8
Mₐ = 0.24 M
Therefore, the molarity of the acid is 0.24 M
What important material is absorbed by your digestive system besides water
Answer:
The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining
Explanation:
Answer:
The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining.
Explanation:
A 0.43g samle of KHP required 24.11cm of NaOH for neutralization. Calculate the molarity of NaOH
Answer:
0.083 M
Explanation:
We'll begin by calculating the number of mole in 0.43 g of KHP (potassium hydrogen phthalate, C₈H₅O₄K). This is can be obtained as follow:
Mass of C₈H₅O₄K = 0.43 g
Molar mass of C₈H₅O₄K = (8×12) + (5×1) + (16× 4) + 39
= 96 + 5 + 64 + 39 = 204 g/mol
Mole of C₈H₅O₄K =?
Mole = mass / molar mass
Mole of C₈H₅O₄K = 0.43 / 204
Mole of C₈H₅O₄K = 0.002 mole
Next, we shall determine the number of mole of NaOH required to react with 0.43 g (i.e 0.002 mole) of KHP. This can be obtained as follow:
C₈H₅O₄K + NaOH → C₈H₄O₄KNa + H₂O
From the balanced equation above,
1 mole of KHP reacted with 1 mole of NaOH.
Therefore, 0.002 mole of KHP will also react with 0.002 mole of NaOH.
Next, we shall convert 24.11 cm³ to L. This can be obtained as follow:
1000 cm³ = 1 L
Therefore,
24.11 cm³ = 24.11 cm³ × 1 L / 1000 cm³
24.11 cm³ = 0.02411 L
Finally, we shall determine the molarity of NaOH. This can be obtained as follow:
Mole of NaOH = 0.00 2 mole
Volume = 0.02411 L
Molarity of NaOH =?
Molarity = mole /Volume
Molarity of NaOH = 0.002 / 0.02411
Molarity of NaOH = 0.083 M
What is the force being applied to an object with a mass of 12 KG and an acceleration of 4M/S
Answer:
48 newtons
Explanation:
f=m*a
What is a renewable resource on Earth?
minerals
coal
wind
petroleum
Answer:
Wind
Explanation:
Wind turbines make energy by the movement of the natural force on earth called 'wind' and renewable resources are resources that can be made from natural and environment-safe objects or things (e.g. Water, Geothermal Heat, The Sun, and Wind)
What is the temperature of the gas inside a 750 ml balloon filled with 0.30 g hydrogen gas? The pressure of the balloon is 1.2 atm.
What is the smallest ph possible
Answer: -3.6
Explanation:
The lowest pH of -3.6 is the lowest known for any water in the environment
3 attempts left
Check my work
Enter your answer in the provided box.
The pressure inside a 1.0 L balloon at 25°C was 750 mm Hg. What is the pressure (in mmHg) inside the
balloon when it is cooled to -65°C and expands to 3.3 L in volume?
mm Hg
Answer:
shhsss×<×>×××<××××
Explanation:
4×738×8<#329×
how is the periodic table important for all of science and not just chemistry? pleas answer me
Answer:
The periodic table has been there for such a long time and how it is helpful in all science it is the element itself. How the element is used in real life. For example, oxygen is used in the atmosphere. Plants use carbon in order to covert it into oxygen more like that
A ball of ice, rock, dust, and gas that orbits the Sun is called a(n) comet. asteroid. meteor. meteorite.
Answer: comet
Explanation: :)
Is anyone good at chemistry if so can someone help me please ?
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Question 15
We're given the [OH⁻] as 8.34 × 10⁻¹² M. Using the formula pOH = -log[OH⁻], the pOH of this solution would be -log(8.34 × 10⁻¹²) ≈ 11.08.
The pOH is, for lack of a better term, the "opposite" of pH: A pOH of 7 is neutral; a pOH less than 7 is basic; and a pOH greater than 7 is acidic.
This follows from the relation, pH + pOH = 14. In this case, with a pOH of 11.08, our pH would be 14 - 11.08 = 2.92, which is acidic (pH < 7).
Thus, the correct answer choice is B.
