Answers
Answer:
Fire is a chemical hazard, because of explosives and nukes. Falling debris is physical, difficulty breathing is a biological hazard, and fungi, pesticides, and cockroaches are biological as well. Muriatic acid is chemical, so is bleach. And any vibrations and noises or corrosion are physical.
Related Questions
how many molecules are in 90g of agno3
Answers
Answer:
0.5298072502356179
Explanation:
How do scientists know how reconstruct a fossil?
Scientists will use the structure of existing animal as a model.
Each fossil piece fits together perfectly.
There are labels found in each of the fossil bones.
The location of each fragment found provides clues on how the animal looks.
Answers
A, Scientists will use the structure of existing animals as a model :)
Answer:
Scientists will use the structure of existing animal as a model.
Explanation:
-lukelaws
please mark me brainliest I need one more please!!!
What are the correct coefficients in order for the equation to be balanced?
Answers
2 KCLO3
2 KCL
3 O2
If 16.4 grams of copper (II) bromide react with 22.7 grams of sodium chloride, how many grams of sodium bromide are formed?
Answers
The amount of sodium bromide that would be formed from the reaction will be 7.5524 grams
Stoichiometric calculationLooking at the equation of the reaction:
[tex]CuBr_2 + 2NaCl --- > CuCl_2 + 2NaBr[/tex]
The mole ratio of CuBr2 and NaCl is 1:2.
Mole of 16.4 grams of CuBr2 = 16.4/223.37
= 0.0734 moles
Mole of 22.7 grams of NaCl = 22.7/58.44
= 0.3884 moles
Equivalent mole of NaCl = 0.1468 moles
Thus, NaCl is in excess while CuBr2 is limiting.
Mole ratio of CuBr2 and NaBr = 1:1
Mass of 0.0734 mole NaBr = 0.0734 x 102.894
= 7.5524 grams
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Label the equivalence point on the graph of pH versus volume of the titration of a strong acid
and strong base shown below.
a. What volume of base was needed to neutralize the acid?
b. What is the pH at the equivalence point?
c. how does the number of moles of hydro i um ions and hydroxide ions compare at the equivalence point?
Answers
Based on the titration curve, the titration is of a strong acid strong base and pH at equivalence point is 7.
What is equivalence point?The equivalence point in an acid-base titration is the point at which equal amount of acid and base have reacted.
The equivalence point in a strong acid-strong base titration is at pH 7.
In a weak acid-strong base titration, the pH is greater than 7 at the equivalence point.
In a weak base-strong acid titration, the pH is less than 7 at the equivalence point.
From the titration curve;
volume of base was needed to neutralize the acid is 50 mL pH at the equivalence point is 7the number of moles of hydronium ions and hydroxide ions at the equivalence point are equal.Therefore, the titration curve is of a strong acid strong base.
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When aluminum oxidizes in air, it forms aluminum oxide (Al2O3):
4Al(s)+3O2(g)→2Al2O3(s)
A 102 g sheet of aluminum oxide formed completely in excess oxygen.
How many grams of aluminum were oxidized?
27 g
51 g
54 g
102 g
Answers
Answer:
54g
Explanation:
al= 27gmol-1
al 2mol=54g
Answer: 54 g
Explanation:
If 70.0g of manganese (IV) fluoride reacts with 70.0g ammonium sulfide, which reactant is
the limiting reactant and how many grams of the excess reactant is left over?
MnF_4(aq)+2(NH_4)_2S(aq)-> MnS_2(s)+4NH_4F(aq)
Answers
The limiting reactant would be the ammonium sulfide and the amount of the excess manganese (IV) fluoride would be 1.96 grams
Limiting reactantsFrom the equation of the reaction:
[tex]MnF_4(aq)+2(NH_4)_2S(aq)- > MnS_2(s)+4NH_4F(aq)[/tex]
The mole ratio of [tex]MnF_4[/tex] to [tex](NH_4)_2S[/tex] is 1:2
Mole of 70 g [tex]MnF_4[/tex] = 70/130.93
= 0.53 moles
Mole of 70 g [tex](NH_4)_2S[/tex] = 70/68.154
= 1.03 moles
Equivalent mole of [tex](NH_4)_2S[/tex] = 0.53 x 2
= 1.06 moles
Thus, [tex](NH_4)_2S[/tex] seems to be limiting while [tex]MnF_4[/tex] is in excess.
Excess [tex]MnF_4[/tex] = 0.53 - 1.03/2
= 0.015 mole
Mass of 0.015 mole [tex]MnF_4[/tex] = 0.015 x 130.93
= 1.96 grams
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HCl(aq) + ZnS (s) →
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answers
How many moles of H20 are contained in 4.21 x 1024 molecules of H2O?
O A 2.53 x 1048 moles
OB. 2.34 x 1023 moles
C. 6.99 moles
OD. 0.143 moles
Answers
Answer:
C. 6.99 moles
Explanation:
To convert molecules to moles we simply divide the given number of molecules by Avogadro's number, 6.022 x 10²³
Given number of molecules : 4.21 x 10^24
Number of moles : 4.21 x 10^24 / 6.022 x 10²³ = 6.99 moles ( rounded )
The answer is C
B 2. Meena is at the seaside and drops a message in a bottle into the sea. Explain why the bottle floats and will not sink.
Answers
What is an indicator?
Answers
Hope it helps you!!
Why The background of images seemed not same?
Answers
Answer:which pictures?
Explanation:show the pictures first
answer: time
Explanation:
well the clouds are moving and the time is different or the seasons also make the background different
Formation of Ionic bond
1. formation of Potassium Sulphide.
Answers
Answer:
It can be produced by heating K2SO4 with carbon (coke): K2SO4 + 4 C → K2S + 4 CO. In the laboratory, pure K2S may be prepared by the reaction of potassium and sulfur in anhydrous ammonia.
What is the average speed (actually the root-mean-square speed) of a neon atom at 27°C?
Answers
Answer:
432m/s
Explanation:
The rms speed (u) is related to the temperature (T) and molecular weight (M) by the expression
u=
M
3RT
u=
40×10
−3
kg/mol
3×8.314J/molK×(27+273.15)K
u=432.2m/s
Hence, the rms speed is 432.2 m/s
hope this is helpful
the respect given to all kind of labour
give one word answer
please help me fast
Answers
Answer:
dignity
Explanation:
it is called the dignity of labour
Earth's rotation causes the Coriolis effect. What impact does the Coriolis effect have on global winds?
Answers
Answer:
The Earth's rotation means that we experience an apparent force known as the Coriolis force. This deflects the direction of the wind to the right in the northern hemisphere and to the left in the southern hemisphere.
Explanation:
What is the only way to confirm that a chemical change has taken place?
O A. You can observe a color change.
B. You can see that the mass of material has changed.
C. You can record a temperature change.
D. You can tell that a new substance has formed.
Answers
Task: Study the pictures above, Write at least five differences of active and inactive volcano based on the picture you've seen and observed above.
Answers
Answer:
Explanation:
1. There are fire and flashes at the top of an active volcano. No fire nor flashes for inactive volcano.
2. Smoke and debris come off an active volcano. No smoke nor debris from inactive volcano.
3. Magma flows from top of active volcano. No magma from inactive volcano.
4. There can be snow on top of inactive volcano. Active volcano is too hot for that.
5. There are plants and other wild lives around an inactive volcano.
Evaluate
0.411+9.9+0.8
and round the answer appropriately.
Express your answer numerically using the appropriate number of decimal places.
( its not 11.111)
Answers
Answer:
11.1
Explanation:
the only reason i can think of why it wouldn't be 11.111 is improper rounding and sig figs. so if you round with sig figs it would be 11.1
The sum of the given values 0.411, 9.9, and 0.8 is 11.111 which on approximation gives 11.11.
To round the answer appropriately, we need to consider the desired number of decimal places. In this case, we are asked to express the answer numerically using the appropriate number of decimal places.
The sum of 0.411, 9.9, and 0.8 is:
0.411 + 9.9 + 0.8 = 11.11
Rounded to the appropriate number of decimal places, the answer is 11.11.
The answer is calculated using the appropriate number of decimal places.
Therefore, The sum of 0.411, 9.9, and 0.8 is 11.11.
To know more about the sum:
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________ is a type of root system.
Stemroot system
Taproot system
Leaf root system
Seedling root system
Answers
. Why do you think bases are often described as the “opposites” of acids?
Answers
they simply don't have the same characteristics
Explanation:
An acid produces a hydroxonium ion as positive which is part of the reason why they are corrosive
Bases are less corrosive which is why they can neutralize an acid to give salt and water
Which of the following statements is true?
A. Energy can be created, but not destroyed.
B. Some machines are 100 percent efficient.
C. Atomic energy can't be converted into electricity.
D. When work is done, some energy is always "lost" as heat.
Answers
Answer:
D
Explanation:
Heat sometimes gets "lost" when work is done
what is relative atomic
Answers
Answer:
The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12.
2. A closed system contains 2g of ice. Another 2g of ice are added to the system. What is the final
mass of the system?
Answers
Answer:
4
Explanation:
2+2=4
What is a mass number (A)?
Answers
Answer:
The mass number in a nucleus is the combined number of protons and neutrons, so it's protons and neutrons, and A symbolizes it. So A is the number of masses, which is equal to the number of protons, that is the number of atoms that we symbolized by Z, plus the number of neutrons.
The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.
How many moles are in 239 g of iron? Express your answer to three significant figures.
Answers
there are 55.845 grams of iron per mol
239/55.845
Which factor
was most important in Pizarro's
conquest of the Incas?
O The Incan Empire had been weakened by a long civil
•
The Spanish were able to capture most of the Incas' artillery.
O Pizarro brought his vast personal wealth with him from Spain.
•
Pizarro's army engaged in guerilla warfare.
Answers
Answer:
A. The Incan Empire had been weakened by a long civil war.
Answer:
The correct answer is A. The Incan Empire had been weakened by a long civil war
Explanation:
I took the Test
A chemical reaction yields 3 moles of lithium hydroxide (LiOH).
How many grams of lithium hydroxide are present?
3 g
24 g
48 g
72 g
Answers
Answer:
The mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
The mass of a compound present in a mole of sample has been equivalent to the molar mass of the compound. The molar mass of the compound has been the sum of the constituent in a formula unit.
Explanation:
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Answer: 24 g
Explanation:
7. Radial probability distributions for the 4s orbital of hydrogen has _______ peak(s). a. 0 b. 1 c. 2 d. 3 e. 4
Answers
Answer:
3
Explanation:
That's the answer
I hope it helps
Which type of molecule is acetone?
A. Amine
B. Ketone
C. Alcohol
D. Aldehyde
Answers
Answer: B. Ketone
Explanation: Another name for acetone is propanone, and it is the main ketone as it has the functional group in the middle, a CH3 on each side. Ketones have the C=O functional group.