Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could she use to produce the hydrogen she needs? NaOH and oil Zn and KOH H2SO4 and CaCO3 Mg and HCl
Answer:
Mg and HCI
Explanation:
The combination that she uses to produce hydrogen gas is:
d. Mg and HCl(Magnesium and Hydrochloric acid)
Production of hydrogen gas:When magnesium reacts with Hydrochloric acid, It leads to the formation of Magnesium chloride as a salt, and hydrogen gas is liberated.
[tex]Mg+2HCl--- > MgCl_2+H_2[/tex]
When a metal reacts with an acid, it leads to the liberation of hydrogen gas and the production of their respective salt.
Thus, option d is correct.
Find more information about Hydrogen gas here:
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Density = Mass
Volume
To find the density of a solid:
Find the mass of the block.
Find the volume of the block using (length x width x height)
Use the equation to find density.
#1 #2 #3 #4 #5 = (2x3x4) #1/#5
Block #
Mass (g)
Length (cm)
Width (cm)
Height (cm)
Volume
(cm3)
Density (g/cm3)
1
75
6
3
4
72
1.04
2
3
4
5
6
7
8
Follow up questions:
Which two blocks were made out of the same material?
How do you know?
Does a larger block always have a higher density?
Answer:
what is it all about???
Suppose you used 0.5 M NaOH to titrate your vinegar sample instead of 0.1 M. What effect does the concentration of base added have on the reliability of the results of your titration?
Answer: the reliability will be worse
Explanation:
Suppose we used 0.5 M NaOH to titrate our vinegar sample instead of 0.1 M.
Now by using 0.5M instead of 0.1M we are increasing the concentration of NaOH,
We know that the moles used = Volume x concnetration.
so for the same no of moles, if the concentration increases, the volume decreases.
Hence it will consume less NaOH.
now Since the volume decreases, the titration volume of less number will increase the % error.
Therefore the reliability will be worse.
The effect that the concentration of the added base has on the reliability of the results of the titration in question is; The reliability will be worse.
We are told that;
0.5 M NaOH is to be used to titrate a vinegar sample instead of 0.1 M.
Now, 0.5 M means a concentration of 0.5 and since it is higher than 0.1M, it means the concentration of NaOH will increase.
Formula for number of moles used is;
n = V × M
Where;
n is number of moles
V is volume
M is concentration
We can see that number of moles is directly proportional to the volume and concentration.
Thus, if the number of moles remains unchanged, as we have increased the concentration, it means that the volume will decrease.
Thus, lesser volume of NaOH will be used and as a result of this decrease in volume, there will be a greater possibility of error.
In conclusion, we can say that the reliability will be worse.
Read more at;https://brainly.com/question/22702792
Based on the information in the table, which of the following arranges the bonds in order of decreasing
polarity?
Choose 1 answer:
H-S > Sn-Te > Si-F
Sn-Te > H-S > Si-F
Si-F>H-S > Sn-Te
Si-F > Sn-Te > H-S
Answer:
what grade so i can help
Explanation:
Answer:
I believe it’s Sn-Te > H-S > Si-F
Explanation:
Question 3 of 25
What is another name for Group 14?
Answer:
4A
Explanation:
on the periodic table
From acetic acid how to get formic acid ?
Answer:
The Reaction of acetic acid withNaN3 gives out methylamine. rxn of methylamine to HNO2 to give out methanol. oxidation of methanol via Kcr207(H+) to give formic acid.
how many s orbitals are there for silver?
5 electron orbits
I hope this helps
Volume and mass examples
Answer: Example: A bowling ball and a basketball are about the same volume as each other, but the bowling ball has much more mass
Explanation: Mass and volume are two units used to measure objects. Mass is the amount of matter an object contains, while volume is how much space it takes up.
What is the tissue that allows for flexibility of bones?
Answer:
Bone Marrow, or Cartilage
Write the formula for diphosphorous pentoxide
Answer:
P4O10
Explanation:
Which of the following is not a required characteristic for a living organism?
A) reproduction
B) mobility
C) homeostasis
D) adaptation
Answer:
B
Explanation:
living things are not required to move
Occurs when the membrane surrounds a large substance and engulfs it.
) Active Transport
O Diffusion
O Endocytosis
Exocytosis
How many atoms of carbon are present in the products?
6CO2+6H2O=C6H12O6+6O2
Answer:
2.41 * 10^24 atoms of carbon present in the products.
Explanation:
First, we need to find the moles of carbon in the products in order to find the number of atoms.
We see that in the chemical formula, carbon belongs to the compound known as glucose. To get the amount of moles of carbon, we need to divide my the amount of carbon within glucose (in grams) from the total amu ( or grams) of glucose to get the moles.
C6 = 72.066.
C6H12O6 = 180.156
72.066/180.156 = 0.4000199827 moles of Carbon within the Glucose compound
Now we will convert to atoms/molecules by multiplying the moles by avogadro's number..
0.4000199827 moles C * 6.022*[tex]10^{23}[/tex] = 2.408920336 *[tex]10^{24}[/tex] atoms of Carbon present in the products
*Note --> this can be estimated to 2.41 * [tex]10^{24}[/tex] atoms of Carbon
Which is an example of a compound? * He3 or H2O or C
Answer:
H2O
Explanation:
There is more than one element
In a carbon dioxide molecule, a double covalent bond forms when the carbon atom shares what
pairs of valence electrons with each oxygen atom.
Answer:
2 pair of an electron
Explanation:
carbon having 6 valence electron 2 electron involved in covalent bonding so 4 electron means 2 pairs of an electron will left.
VERY EASY QUESTION
Does a theory help prove an experience or an experience help prove a theory?
Answer:both
Explanation:
It depends on where your looking at it from
Answer:
an expierience help prove a theory.
A lidded glass container is filled with a colored gas. After a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. Next, a warm iron plate is carefully placed under the box. Why is there resumed movement of the gas in the container?
A) The warm iron plate absorbed energy from the gas particles, making them move faster.
B) The warm iron plate vibrated due to the energy it had, disturbing the gas in the process.
C) Heat from the warm iron plate transferred energy to the gas particles, making them move faster.
D) The warm iron plate heated the insulated box causing it to vibrate, disturbing the gas in the process.
Answer:
It's not A, it's likely not C? I'm guessing B or D.
Why do the carbon anodes need to be replaced regularly in the electrolysis of Al2O3 into aluminum metal?
A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.
B) The intense heat for the reaction breaks them apart.
C) They become saturated with aluminum metal.
D) They get oxidized by air in the intense heat of the reaction.
Answer:
A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.
Explanation:
In the electrolysis of Aluminium, the oxygen reacts with the carbon anodes forming carbon dioxide. That is, the anodes are oxidized. To ensure that the reaction completes, the anode must gradually be replaced as the reaction proceeds. The correct option is hence;
A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.
I need help ASAP pls
Answer:
1.40.078 u
2.26.981539 u
3.207.2 u
4.56
5.53.9396147 u
6.1.00784 u
Explanation: your welcome
How many joules are required to melt 250 grams of water
Answer:
i not sure but i searched it up and it said Q=104525J
Explanation:
A 5.0 g sample of metal was heated from 10°C to 40. °C. It absorbed 43.7 J of energy as heat. What is the specific heat of this piece of metal?
Answer:
Balls
Explanation:
Cuz
Question 8 (3 points) What is the formula for Silver (III) sulfide? O Ag2(SO4)3 O Ag3(SO4)2 Ag3S2 Ag2S3
The formula of Silver (III) Sulfide is Ag2S3.
Hope this helps. Please mark brainliest!
Middle school science help please. ill give brainliest
Answer:
It converts The liquid into a gas at the same temperature.
Explanation:
Answer:
it converts the liquid into gas at the same temperature
Explanation:
when heat is added to a liquid at boiling temperature it converts the liquid into gas at that same boiling temperature
please give brainliest
Please answer. Thank you
Answer:
Explanation:
what are tho anwser choices
What is the visual differences between elements compounds and mixtures
Answer: yes I can do that tomorrow
Explanation:
A 12.0% sucrose solution by mass has a density of 1.05 gem, what mass of sucrose is present in a 32.0-mL sample of this solution?
A) 0.126g
B) 3.66g
C) 4.03g
D) 3.84g
E) 280 g
Answer:
Option C. 4.03 g
Explanation:
Firstly we analyse data.
12 % by mass, is a sort of concentration. It indicates that in 100 g of SOLUTION, we have 12 g of SOLUTE.
Density is the data that indicates grams of solution in volume of solution.
We need to determine, the volume of solution for the concentration
Density = mass / volume
1.05 g/mL = 100 g / volume
Volume = 100 g / 1.05 g/mL → 95.24 mL
Therefore our 12 g of solute are contained in 95.24 mL
Let's finish this by a rule of three.
95.24 mL contain 12 g of sucrose
Our sample of 32 mL may contain ( 32 . 12) / 95.24 = 4.03 g
Write the net ionic equation for Potassium chloride + sodium nitrate
I believe the answer is this:
KCl + NaNO3 --> KNO3 + NaCl.
Answer:
No reaction
Explanation:
KCl + NaNO3 --> KNO3 + NaCl
Since these substances are all aqueous (no precipitates or other phases involved), if you were to write the ionic equation and cross out spectators, they'd all cancel so there is no reaction.
1. These values were obtained as the mass of products from the same reaction: 8.83 g;
8.84 g; 8.82 g. The known mass of products from that reaction is 8.60 g. The values
are:
accurate
precise
both precise and accurate
neither precise nor accurate
0
Answer:
precise
Explanation:
precise because they are almost the same measurement over and over ( remember in significant digits the last number is considered to be an estimate on measurements). The known value, 8.60 g, is pretty far from the measurements taken so it cant be accurate.
The values obtained in the measurement of the mass of products from the same reaction are precise but not accurate.
Recall that:
Precision refers to the closeness of repeated measurements made on the same variableAccuracy refers to the proximity of a measurement to its true, predetermined value.In this case, one can see that the repeated measurements of the mass of the products were close to each other with a range of 0.02 g.
The average of the measurement can be calculated such that:
8.83 + 8.84 + 8.82/3 = 8.83 g
The predetermined mass of products from the reaction is 8.60 g. The difference from the average measurement can be calculated as:
8.60 - 8.83 = 0.23
The difference between the measurement and true value is significant. thus, the result is not accurate.
More on precision and accuracy can be found here: https://brainly.com/question/18974348
How many moles of water will be produced from the combustion of 0.27 moles of CH3OH?
Answer:
0.54 mole of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2CH3OH + 3O2 —> 2CO2 + 4H2O
From the balanced equation above,
2 moles of CH3OH reacted to produce 4 moles of water.
Finally, we shall determine the number of mole of water (H2O) produced by the reaction of 0.27 moles of CH3OH. This can be obtained as follow:
From the balanced equation above,
2 moles of CH3OH reacted to produce 4 moles of water.
Therefore, 0.27 moles of CH3OH will react to produce = (0.27 × 4)/2 = 0.54 mole of H2O.
Thus, 0.54 mole of H2O is produced from the reaction.
I need help on my homework I don’t know this answer
Answer:
I believe the answer would be
b.) valence electrons, all thw electrons that surround the nucleus of an atom
Explanation:
You're welcome