Answer:
Mechanical advantages allows humans to perform tasks much easier in terms of the force they need to apply, but must always obey the conservation of energy. Mechanical advantage is a measure of the ratio of output force to input force in a system, used to analyze the forces in simple machines like levers and pulleys.A good example is pushing a heavy object up a ramp. It may be easier to push the object up a ramp instead of just lifting it up to the right height, but it takes a longer distance.Explanation:
Hope it helps you!!Find the weight of sodium hydroxide needed to form a 1M solution of 500 mL.
[tex]\\ \rm\Rrightarrow Molarity=\dfrac{Moles\:of\:solute}{Volume\:of\: solution \:in\:L}[/tex]
[tex]\\ \rm\Rrightarrow 1=\dfrac{n}{0.5}[/tex]
[tex]\\ \rm\Rrightarrow n=0.5mol[/tex]
Molar mass of NaOH=23+16+1=40u[tex]\\ \rm\Rrightarrow n=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \rm\Rrightarrow 0.5=\dfrac{Given\:mass}{40}[/tex]
[tex]\\ \rm\Rrightarrow Given\:mass=40(0.5)=20g[/tex]
One of these compounds has resonance forms. Draw their Lewis structures to determine which
compound must be represented with resonance forms. Please use the periodic table if needed.
C2H2
O resonance
O no resonance
The molecule C2H2 has resonance structures because it can be represented using four Lewis structures.
What is a resonance structure?Sometimes, a single Lewis struture does not suffice in eliucidation of the bonding properties of a molecule. In such cases, we have to invoke multiple structures called resonace structures.
The resonance structures of C2H2 are shown in the image attached. Hence we can see that the molecule can be represented using four Lewis structures.
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Answer:
No resonance!
Explanation:
just did the activity <3
Determine the calories(same as kilocalories) in a meal consisting of a hamburger with a bun (2760 kJ), french fries (1257 kJ), and a small soft drink (419 kJ). Use significant figures
Answer:
I dont km now this one at all sorry
Five important things about Fluorine>
Answer
here hope this helps !
hello everyone, i need resources to help for my chemistry test, if you have any free sources for studying: mole conversions, stoichiometry, thermochemistry, reaction types, molar mass, hess' law and chemical equations. That would be nice cuz im studying last minute. Thank you.
Answer:
Yes, there are some free resource like quiz..let quizzes to help guide you through your studying, so if you want just post the questions and I can answer them as well.
Given the chemical formula, KNO3, the percent nitrogen in the compound
Answer:
16 % is the percentage of nitrogen
Read the passage.
Water can react with hydrochloric acid (a strong acid) to form hydronium and chlorine ions. In this case, water acts as a base. Water also reacts with ammonia (a strong base) to form ammonium and hydroxide ions. In this case, water acts as an acid.
Which option correctly describes the reason for this phenomenon?
1. Water is a neutral compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
2.Every substance can act as a base or an acid depending on the reaction they partake in. This property of substances is called amphotericity.
3. Water acts as a conjugate acid when coupled with a strong acid, or as a conjugate base when coupled with a strong base.
4. Water is an amphoteric compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
1.
Newton's first law of inertia says that an object at rest will stay
at rest and an object in motion will stay in motion unless acted on by a force.
Explanation:
Neo mixes 600ml of black paint with white paint in order to get a gray paint. he think the colour came out too dark ,so that decreases the amount of black paint in the ratio 7:12. Calculate how much black paint it would be
Answer:true
Explanation:
because its just true
Which of the following factors is needed during light-dependent reactions to create ATP and NADPH energy molecules?
Oxygen
Solar energy
Carbon dioxide
Water
Explain anaerobic respiration with yeast in your own words
Answer:
Is breaking down of food substances in the abscence of Oxygen
A particular tank of oxygen gas contains 785 L at 21°C.If the pressure remains constant,what volume will the gas occupy if the temperature is changed to 28°C? (Write procedure)
how many grams of He gas are in 31.35 L of He gas at STP?
Answer:
Ans: 5.8g
Explanation:
31.35L * 1mol/22.4L * 4.00g/1mol = 5.81g
What change was caused by a change in temperature?
Answer:
The temperature of the earth determines how much water there is in our atmosphere. Carbon dioxide is the most commonly discussed of the greenhouse gases. This has occurred primarily because of the huge amounts of carbon dioxide humans are moving from the earth to the atmosphere in the burning of fossil fuels.Explanation:
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Use the map to identify which body of water (A, B, C, or D) matches bar 3, and explain your answer.
A chemist has 2. 0 mol of methanol (CH3OH). The molar mass of methanol is 32. 0 g/mol. What is the mass, in grams, of the sample? 16 grams 30 grams 32 grams 64 grams.
The mass, in grams, of the sample of methanol (CH₃OH) is 64 grams.
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M = molar mass
In the question that:
Moles of methanol = 2mole
Molar mass of methanol = 32g/mole
On putting these values in the above equation, we get
W = n × M
W = 2mole × 32g/mole = 64g
Hence, 64 grams is the mass of the sample.
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Last night you were watching the news on the television and the weather forecast for today is muggy and hot. The temperature in the house is rising you turn on the air condition unit and made the room temperature lower.
Answer:
The weather from the outside has impact n what goes on inside. Due to it being hot and muggy out, the weather was able to mess with the temperature in the house.
Explanation:
An air condition is used to regulate the temperature of a room by removing heat as well as reducing humidity.
What is temperature?Temperature is the degree of coldness or hotness of an object or a particular place.
The temperature of an area is affected by the climate and the amount of sunshine.
Also due to heating, water vapor rises into the atmosphere resulting in humidity.
An air condition makes a temperature room cooler by removing heat as well as reducing humidity.
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it takes 83.0mL of a 0.450 M naOH solution to neutralize 235 mL of an HCl solution. What is the concentration of the HCl solution.
Answer:
0.159 M (3 s.f.)
Explanation:
This is an acid- base reaction, which is also known as a neutralisation reaction.
[tex]\boxed{acid \: + base→salt \: + water}[/tex]
1) Write out the balanced chemical equation.
NaOH (aq) +HCl (aq) → NaCl (aq) +H₂O(l)
The equation is balanced as on each side of the equation, there is 1 Na atom, 1 O atom, 2 H atoms and 1 Cl atom.
2) Find the number of moles of NaOH.
The symbol 'M' denotes Molarity, which is the number of moles per litre.
From the given concentration of NaOH,
1 L NaOH ----- 0.450 mol NaOH
Convert 83.0mL to litres:
Volume of NaOH
= 83 ÷1000
= 0.083 L
Moles of NaOH
= 0.083 ×0.450
= 0.03735 mol
3) Find the number of moles of HCl.
From the balanced equation, 1 mole of HCl is needed to neutralize 1 mole of NaOH.
Thus, amount of HCl
= 0.03735 mol
4) Calculate the concentration of HCl
Concentration= mol/ volume
Converting the volume from mL to L,
235 mL= 0.235 L
Concentration of HCl
= 0.03735 ÷0.235
= 0.15894 mol/L (5 s.f.)
= 0.159 M (3 s.f.)
If I gave you 3 moles of methane, how many moles of water will be produced?
Answer: 6 moles
Explanation:
14 Water falling from the sky as
rain or sleet is called
A water cycle
B precipitation
C snow
D hail
Pls help
Answer:
b precipitation
Explanation:
When rain or sleet falls, it is concidered precipitation!
Have an amazing day!!
PLEASE RATE AND MARK BRAINLIEST!!!!
The bottom wave has a greater _____
Answer:
frequency because it moves up and down faster.
Explanation:
Answer: current and pull making quicker wave and smaller
Explanation:
you and a friend each hold one end of a long spring toy and shake it back and forth to make waves. What is the medium fot these waves? A:Your friends hand
B:The air C:The spring D:Your hand
Question 22 of 25
What are two benefits of scientists using a diagram to model the water cycle?
I A. Only a few factors in the water cycle can be shown on the
diagram
B. It can show changes that occur in many different parts of Earth at
the same time.
C. It can be used to show as much detail as is present in the actual
water cycle.
D. It can be used to show how the parts of the cycle relate to one
another.
Answer:
D. and B.
Explanation:
I got it right on my quiz
Provide an example of an Energy Conversion
Answer:
An example of this is gasoline being put into our cars. With the help of the battery's energy, cause mechanical energy for the car to move faster amd longer than it would have lasted withut gas.
Explanation:
Calculate the molarity of 0.5 moles NaHCO3 in 3,691 of solutions
Answer: 0.135 M
Explanation:
How many elements make up Ibuprofen?
C13H18O2
Answer:
Explanation:
wouldn't it be three because every capital is a new element?
The molar mass of hydrogen (H2) is 2. 02 g/mol. A sample contains 4. 00 mol of H2. What is the mass, in grams, of this sample? 1. 98 grams 2. 02 grams 4. 00 grams 8. 08 grams.
Answer:
8.08 G/mol
Explanation:
This is because a mole just equals 1 amount of something. Example, 1 mol of carbon is about 12 AMU. To convert from Mols to Grams, you need to multiply the substance mass by the amount of mols, this case 2.02g/mol by 4.
Hope this helps!
please help me 50 points!
Answer:
AgNO and NaNO + AgCI
Explanation:
Because 10 mol of NaCI is AgNO!
Select the statement that correctly describes the connection between two nucleotides:
A phosphodiester bond would form between the phosphate groups of each of the nucleotides..
A phosphodiester bond would form between the base of one nucleotide and the phosphate of the second nucleotide.
A phosphodiester bond would form between the phosphate group of one nucleotide and a hydroxyl group of the second nucleotide.
A phosphodiester bond would form between a purine base of one nucleotide and a hydroxyl group of the second nucleotide.
Answer:
The band that looks like milk in the night sky isn't actually milk,
Explanation:
Which is a trait of a technical text?
Which one of the following indicators would be best to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?
When there is 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl, and the pH mathematically given as
pH=4
The indicator is Methyl red
What is best for titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?Generally, the equation for the Chemical Reaction is mathematically given as
HCl +BOH--->BCl+H20
Therefore
pH=0.5(pkw-pkb-logl)
pH=0.5()14-5.8-logl
pH=4
In conclusion, The best indicator should have pKa =pH
Hence
Methyl red is best
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The best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.
What is an acid-base indicator?An acid-base indicator is a substance which change colour or develop turbidity at a particular pH.
Acid-base indicators are used during acid-base titrations to detect when neutralization has occured.
The indicators to be used when combining acid and base are as follows:
Strong acid-strong base - PhenolphthaleinWeak acid-strong base - PhenolphthaleinStrong acid-weak base - Methyl orangeMorphine is a weak base while hydrochloric acid is a strong acid.
Therefore, the best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.
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What happens to the energy absorbed during an endothermic reaction
Answer:
more energy is absorbed when the bonds in the reactants are broken