Answer:
2 uses of retort stand:
Retorts are used for distillation experiments (such as organic distillations) and titrations (where they hold a burette). They are also used as supports in filtration.(2-2) Looking at the chemical formula CaF2 (calcium fluoride), what do you think this substance is made of? (Choose ALL that apply
Metal
Metalloid
Non-metal
Answer:
Metal
Non-metal
Explanation:
Ionic compounds are said to be formed when metals donate electrons to non metals.
The metals become positively charged while the nonmetals become negatively charged.
CaF2 is composed of Ca^2+ and F^-. Calcium is a metal of group 2 in the periodic table while F is a nonmetal of group 17 in the periodic table.
Hence CaF2 is composed of a metal and a nonmetal.
What volume, in milliliters, of a 0.997 M KOH solution is needed to neutralize 30.0 mL of 0.0400 M HCl?
Answer:
1.2 mL
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
HCl + KOH —> KCl + H₂O
From the balanced equation,
Mole ratio of the acid, HCl (nₐ) = 1
Mole ratio of base, KOH (n₆) = 1
Finally, we shall determine the volume of the base, KOH needed to neutralize the acid, HCl as follow:
Molarity of base, KOH (M₆) = 0.997 M
Volume of acid, HCl (Vₐ) = 30 mL
Molarity of acid, HCl (Mₐ) = 0.0400 M
Volume of base, KOH (V₆) =?
MₐVₐ / M₆V₆ = nₐ/n₆
0.04 × 30 / 0.997 × V₆ = 1/1
1.2 / 0.997 × V₆ = 1
Cross multiply
0.997 × V₆ = 1.2
Divide both side by 0.997
V₆ = 1.2 / 0.997
V₆ = 1.2 mL
Thus, the volume of the base, KOH needed to neutralize the acid is 1.2 mL.
Help me with chemistry! I got this answer wrong , what would be the right one?
Answer:
I probably think it's to achieve a higher energy state
Explanation:
-
In the equation C H4 + O2 C O2 + H2 O, what are the products?
A) C H4 + H2 O
B) C O2 + H2 O
C) O2 C O2
D) C H4 + O2
Answer:
Option B clearly shows the Products of the reaction
The balanced equation for the combustion of Hexane,C6H14 , is
Answer:
[tex]2C _{6}H _{14} + 19O _{2}→12CO _{2} +14H _{2} O[/tex]
correct name for ZnS
Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite.
The interaction of the skeletal and muscular systems to create movement and locomotion is regulated by which organ system?
Answer:
The muscoloskeletal system
Explanation:
The musculoskeletal system is made up of the body's bones (the skeleton), muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. Its primary functions include supporting the body, allowing motion, and protecting vital organs.
What is the molarity of a solution that is composed of 10 grams of Sodium Chloride ( NaCl) dissolved in 3.50 L of water
Answer: The molarity of solution will be 0.049 M
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (L)}}[/tex]
We are given:
Given mass of sodium chloride = 10 g
Molar mass of sodium chloride = 58.44 g/mol
Volume of solution = 3.50 L
Putting values in above equation:
[tex]\text{Molarity of NaCl}=\frac{10 g}{58.44g/mol\times 3.50}\\\\\text{Molarity of NaCl}=0.049M[/tex]
Hence, the molarity of solution will be 0.049 M
Ca(OH)2+CO2=___+____
Answer:
CaCO3 + H2O
Step by step explanation
PLEASE HELP ASAP DUE SOON WILL MARK BRAINLIEST
calculate the amount of hydrogen sulphide that would be liberated by the action of sulphuric acid on 4.4 gram of ferrous sulphide. (Fe=56;S=32)
You will get iron sulfate and hydrogen sulfide gas (a.k.a. rotten egg gas).
FeS + H2SO4 = FeSO4 + H2S(g)
Change in Free Energy: ΔG(20C) = -66.6kJ (negative, so the reaction runs)
Change in Enthalpy: ΔH(20C) = -37.3kJ (negative, so the reaction is exothermic)
We'll begin by writing the balanced equation for the reaction between ferrous sulphide (FeS) and sulphuric acid (H₂SO₄). This is illustrated below:
FeS + H₂SO₄ —> H₂S + FeSO₄
Next, we shall determine the mass of FeS that reacted and the mass of H₂S produced from the balanced equation. This is illustrated below:
Molar mass of FeS = 56 + 32
= 88 g/mol
Mass of FeS from the balanced equation = 1 × 88 = 88g
Molar mass of H₂S = (2×1) + 32
= 2 + 32
= 34 g/mol
Mass of H₂S from the balanced equation = 1 × 34 = 34 g
SUMMARYFrom the balanced equation above,
88 g of FeS reacted to produce 34 g of H₂S.
Finally, we shall determine the mass of H₂S produced by the reaction of 4.4 g of FeS. This can be obtained as follow:
From the balanced equation above,
88 g of FeS reacted to produce 34 g of H₂S.
Therefore, 4.4 g of FeS will react to produce = (4.4 × 34)/88 = 1.7 g of H₂S.
Thus, 1.7 g of H₂S were obtained from the reaction.
Learn more: https://brainly.com/question/23115234
Polar bonds share electrons _______.
HELP ASAP
Which BEST explains the
relationship between the greenhouse
effect and global warming?
global warming causes the
greenhouse effect
greenhouse effect decreases
global warming
greenhouse effect increases
global warming
greenhouse effect is the same
as global warming
Answer:
greenhouse effect is the same as global warming
Explanation:
they both mean warming of the earths surface
Some please help me!!! ASAP
A sample of O2 with an initial temperature of 50.0 oC and a volume of 105 L is cooled to -25 oC. The new pressure is 105.4 kPa and the new volume is 55.0 L. What was the initial pressure of the sample? Show your work, using the G.U.E.S.S. method.
Answer:
71.92 kPa
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (kPa)
P2 = final pressure (kPa)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
T1 = 50°C = 50 + 273 = 323K
V1 = 105L
T2 = -25°C = -25 + 273 = 248K
P2 = 105.4 kPa
P1 = ?
V2 = 55.0 L
Using P1V1/T1 = P2V2/T2
P1 × 105/323 = 105.4 × 55/248
105P1/323 = 5797/248
0.325P1 = 23.375
P1 = 23.375 ÷ 0.325
P1 = 71.92 kPa
Help needed ASAP, I will mark your answer as brainliest.
what energy is produced when particles vibrate?
sound energy is produced when particles vibrate. When an object vibrates, it causes movement in surrounding air molecules.
A sample of chlorine gas is stored at a temperature of -25oC. If the chlorine gas's temperature is raised to 52oC, its volume increases to 2.60 L. What is the initial volume of the gas?
Answer:
whats ur answer options
Explanation:
...
its b
How many grams of water are produced when 12.50 mol oxygen reacts with hydrogen?
Answer: According to reaction below, when one mol of oxygen reacts with two mol of hydrogen, two mol of water is produced. Thus, when 2.5 mol of oxygen reacted with hydrogen, 2 * 2.5 mol = 5 mol of water is produced. The molar mass of water is 18 g/mol.
Explanation:
Not My WORK! I got this info from another site. BUT I HOPE IT HELPS :)
Can someone help me please? I’d appreciate it! Also please do not send me a link or delete your answer! Thanks
The piston of an internal combustion engine
compresses 218 mL of gas. The final pressure
is 15 times greater than the initial pressure.
What is the final volume of the gas, assuming
constant temperature?
Answer in units of mL.
Answer:
14.53ML
Explanation:
V1=218
V2=?
P2=15p1
USING BOYLE'S LAW
P1V1=P2V2
V2=P1V1/P2=P1(218ML)/15P1
=14.53ML
Let's say that you were given the following
problem:
A gas that exerts a pressure of 151 mm Hg in a
container with a volume of L will exert a
pressure of 166 mm Hg when transferred to a
container with a volume of 0.532 L.
Let's begin by assigning our variables. Let's say
that P1 = 151 mm Hg. What is V2?
Answer:
V2~0.4839M
Explanation:
We're going to use Boyles law to answer the question.
Boyle's law:
P1V1=P2V2
P1=151mmHg
P2=166mmHg
V1=0.532L
V2=?
V2=(P1 x V1)/P2
V2=(151 x 0.532)/166
V2~0.4839M
Hope it helps:)
Answer: C. unknown
Explanation: got it right on acellus
Liquid A has weaker intermolecular forces than liquid B. Which liquid would demonstrate greater surface tension?
Answer:
ronger intermolecular forces will produce greater surface tension .
The intermolecular forces present in a sample of water are hydrogen bonds . The high surface tension of water allows a paper clip to "float" on the surface of the water. It's not actually floating, it's resting on top of the hydrogen bonds that exist between the water molecules at the surface. See the video below which shows a paper clip resting on the surface of water in a beaker.
If the hydrogen bonds are removed or disrupted, the surface tension will decrease. Watch what happens to the paper clip in the video when detergent (which will disrupt hydrogen bonds) is added to the beaker.
Here is video showing how a paperclip can "float" on water - it's actually being held up by the hydrogen bonds formed between water molecules which give water its surface tension.
pls mark me the brainliest
find the no of moles of ca in 8g of ca
Answer:
Thus,there are 0.2 mole in 8 g of calcium.
When 35.47 g of sodium hydroxide react with boric acid (H3BO3), how many moles of sodium borate will be produced?
Answer:
5.83 g
Explanation:
First, you must start with a balanced equation so you can see the mole ratios.
NaOH + H₃BO₃ --> NaBO₂ + 2H₂O
You can see that it takes 1 mole of sodium hydroxide to form 1 mole of sodium borate. 1:1 ratio
Now you must calculate how many moles of NaOH 35.47 g equals.
Na = 22.99 amu
O = 15.99 amu
H = 1.008 amu
NaOH = 39.997 amu
35.47 g ÷ 39.997 amu = 0.08868 moles of NaOH
Since it's a 1:1 ratio, the same number of moles of NaBO₂ is created. Now you must convert moles to grams.
Na = 22.9 amu
B = 10.81 amu
2 O = 31.998 amu
NaBO₂ = 65.798 amu
0.08868 moles x 65.798 = 5.83 g
In hospitals, staff members wear shoes with special soles to prevent build up of static charge as they walk. Why?Single line text.
Answer:
The correct answer is - sudden static charge could damage sensitive medical equipment.
Explanation:
Staff members of a hospital or medical institution wear special shoes that are able to prevent static charge as they walk. These shoes help to prevent static charge as we know that the sudden transfer of a static charge to medical equipment may alter the reports or damage sensitive equipment. This type of static charge is negative or positive due to electronic devices touches the device leads to damage of electric devices.
Thus, the correct answer is - sudden static charge could damage sensitive medical equipment.
A mixture of oxygen( O2), dinitrogen monoxide (N2O), and argon (Ar) has a total pressure of 0.98 atm. What is the partial pressure of N2O, if the partial pressure of O2 is 0.48 atm and the partial pressure of Ar is 0.15 atm?
Answer: The partial pressure of [tex]N_{2}O[/tex] is 0.35 atm.
Explanation:
Given: Total pressure = 0.98 atm
Partial pressure of [tex]O_{2}[/tex] = 0.48 atm
Partial pressure of Ar = 0.15 atm
Partial pressure of [tex]N_{2}O[/tex] = ?
Total pressure is the sum of partial pressure of each component present in a mixture of gases.
Hence, partial pressure of [tex]N_{2}O[/tex] is calculated as follows.
Total pressure = [tex]P_{N_{2}O} + P_{O_{2}} + P_{Ar}[/tex]
Substitute the values into above formula as follows.
[tex]Total pressure = P_{N_{2}O} + P_{O_{2}} + P_{Ar}\\0.98 atm = P_{N_{2}O} + 0.48 atm + 0.15 atm\\P_{N_{2}O} = 0.35 atm[/tex]
Thus, we can conclude that the partial pressure of [tex]N_{2}O[/tex] is 0.35 atm.
When in history was the origin of Sci-Fi as
genre?
Why then?
Answer:
The term science fiction was popularized, if not invented, in the 1920s by one of the genre's principal advocates, the American publisher Hugo Gernsback. The Hugo Awards, given annually since 1953 by the World Science Fiction Society, are named after him.
Explanation:
help!! please this is late!!
Answer:
pentene
Explanation:
pentene is 5 carbon chain with a double bond. The ending -ene indicates presence of double bond.
What is the molar mass of Na2CO3?
60.0 g/mol
O 106.0 g/mol
118.0 g/mol
141.0 g/mol
Answer:
The required molar mass is 106.0 g/mol
Explanation:
We know,
Molar mass of Na = 23 g/mol
Molar mass of C= 12 g/mol
Molar mass of O= 16 g/mol
∴Molar mass of Na2CO3 = {(23 X 2) + 12+ (16 X 3)} g/mol
= (46 + 12 + 48) g/mol
= 106 g/mol
So, the required molar mass is 106.0 g/mol
I’d appreciate the help! :)
Here is the reaction:
3 NO2 (g) + H2O (l) = 2HNO3 (l) + NO (g)
Answer: 300g
Explanation:
first we write the given values on top
224L. x
3 NO2 (g) + H2O (l) = 2HNO3 (l) + NO (g)
22.4L 30g
then we form a formula
224L/22.4L= x/30g
224*30/22.4
6720/22.4= 300g