Answer:
Answer: everything except E
Explanation: There was no dramatic change in temperature and i just took the assignment.
According to the law of conservation of matter, matter cannot be created not be destroyed. In this experiment, no matter loss will occur but there will be rapid evolution hydrogen gas and the balloon will expand.
What is conservation of matter?According to conservation of matter, matter can neither be created nor be destroyed but its state and properties can be changed. The total mass of the reactants will be equal to the total mass of the products.
Magnesium is a second group element and is a metal. Metal reacts with hydrogen halides to form metal halides and hydrogen gas as the reaction written below:
[tex]Mg +2 HCl \rightarrow MgCl_{2} +H_{2}[/tex]
The evolved hydrogen gas in this reaction tries to diffuses out the sealing and thus the balloon cover expands. And thus the solid magnesium metal disappears to form magnesium chloride.
The evolution of gases is exothermic and therefore, the temperature outside increases suddenly. There we can see bubbles of hydrogen in the reaction system.
Therefore, the changes that occur in the experiments are, rapid evolution of gases, solid metal disappears, sealing cover expands and there occur a rapid change in temperature. Thus options A,C,D,E are correct.
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Why is it important to have the correct atomic number when identifying an atom/element?
Answer:
The number of protons in an atom is called its atomic number. This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.
Explanation:
Hope this helped!
Complete the calculation to find the mass of 1 mole of water (H2O). Use the atomic weights given in the periodic table. Select the correct option from each drop-down menu.
Answer:
2x( 1.008 g/mol) +1 x (15.999 g/mol) = 18.015 g/mol
Explanation:
The mass of 1 mole of water (H2O) is 2x( 1.008 g/mol) +1 x (15.999 g/mol) = 18.015 g/mol
What is the mole of one mole of water?
One mole of water is about 18 milliliters.
This is the volume of a few drops of water, 3.65 teaspoons, 1.2 tablespoons, or 0.018 liters. It's not a large volume, yet it contains 6.022 x 1023 water molecules! You can use the same steps to find the mass and volume of any other substance.
How many grams are there in 1 mole of water?18.02 g
So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
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Wind patterns are impacted by which of the following?
Choose ALL that apply
lesson 2.09
Question 7 options:
As a result, air near the equator heats up and rises because it is less dense.
The sun's energy heats air at the equator more than it does at the poles.
Radiant energy from the sun strikes Earth unevenly.
As it rises, it cools and begins to flow toward the poles. As this air leaves the equator, cooler and heavier air from the poles flows along the surface to take its place.
i’m pretty sure it all of them!
ALL options above described can impact the wind patterns.
Wind patterns are completely dependent on the amount of heat present in the environment, which is influenced by sun rays.The sun rays are perpendicular near the Equator, thereby increasing the temperature of the air and changing win patterns.As air rises, it cools and travels to higher latitudes (i.e. toward the poles).In conclusion, ALL options above described can impact the wind patterns.
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Rutherford's alpha particle scattering experiment was responsible for the discovery of
Answer:
Atomic Nucleus
Explanation:
Atomic Nucleus
I NEED THIS ASAP!! Select all that apply.
Air pollution particles may be removed by _____.
oceans
natural cycles
soil
rain
snow
wind
Answer:
Natural Cycles
Explanation:
Most sulfur oxides are produced by burning: coal
Air pollution particles may be removed by _____. rain snow wind natural cycles
The three primary sources of air pollution are _____. factories cars electric power plants
The two basic types of air pollutants are _____. gases particulates
May I get brainliest please?
What reactants go into the process?
I
Answer:
The photosynthesis chemical equation states that the reactants (carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas
Explanation:
Answer:
triangle
Explanation:
dont take me serious
Someone please answer this in like 40 minutes
Before it’s due. Explain the answer too
Answer:
kkkwkisa
Explanation:
wulaoaiq8qiIq8qiaik
1. Substances in which the bonding is best described as ionic include which of the following?
I. CCL
II. CO :
III. CaCl
(A) I only
(B) III only
(C) I and II only
(D)II and III only
(E) I, II, and III
Answer:
D.ll and lll only
Explanation:
that is the best ionic also this i s described the oinic
In what way have humans selectively bred chickens?
True or false. Microwaves heat food evenly.
Answer:
False
Explanation:
When you continuously feed waves into space, there are going to be some cold spots, or "dead spots."
10.Give an example of an adaptation in birds, where shape of beak is related to the eating habits of that bird.
Answer:
It isn't only for the eating habits but also for building nests, hunting small insects, birds, other creatures including defence. Birds have a narrow small throat so the beak helps ripping off small peices of a big animal l(small bird) and for insects they crush and swallow it, they se their beak for feeding their children by grinding food in their beak and transferring it to the youngsters mouth
You bought a balloon for a birthday party in January. It was so cold outside that you ran into the house and forgot the balloon in the car. You go out to the car a few hours later and get the balloon. You noticed that the balloon was a little deflated. Once you brought the balloon into the house, after about 20 minutes, the balloon was back to normal.
Part A: Explain what happened to cause the balloon to deflate and then inflate. Be sure to use unit vocabulary and specific details to support your answer.
Part B: Using the information you provided in Part A, explain what would happen if you left an inflated balloon in the car on a very hot summer day.
Answer:
Part A: When air is left in specific environments, it can either expand or contract depending in the given environment, so, if left in a cold car for a few hours, the air inside said balloon will contract.
Part B: If left in said car on a very hot summer day, the air in said balloon will expand, and if left in said car long enough, said balloon will explode due to the air inside expanding
Hope this helped!
From the balanced reaction:
B2H6 + 3O2 ⇒ 2HBO2 + 2H2O
How many moles of O2 will be needed to burn 36.1 g of B2H6?
Answer:
The mass of O₂ that will be needed to burn 36.1 g B₂H₆ is 125.29 g.
what is the importance of knowing how to identify structural formula of a compound?
Answer:
Structural formulas are helpful because they explain the properties and structure of the compound which empirical and molecular formulas cannot always represent.
Explanation:
HOPE ITS HELPFUL FOR U
There are three bulbs powered by a battery. What will happen if the middle light burns out.
Answer:
nuclear war ;P
Explanation:
how does lanthanide contraction influence the density of period 6 transition element
Answer:
For example, the atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 155 pm (empirical value) and that of hafnium, Hf, (the corresponding period-6 element) is 159 pm. ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3.
Explanation:
Look at the leaves on these plants which pair of sentences about the leaves is true
HELP
Answer the following questions.
Q1. How are solids, liquids and gases similar and different from each other?
________________________________________________________________________
________________________________________________________________________
9
Q2. Differentiate mass from volume.
________________________________________________________________________
________________________________________________________________________
Answer:
Q1: Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Q2: Mass is how much stuff something is made of. Volume is how much space an object takes up.
Ahh, help me I don’t know what to pick
Answer:
for what? is there supposed to be a picture?
Explanation:
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How many total atoms are in 12 NaBr?
5. How many grams of Al2O3 are dissolved in 852 g of water in a 0.329 m solution of Al2O3?
Answer:
Al2o3 grams to moles
Explanation:
You can view more details on each measurement unit: molecular weight of Al2O3 or grams This compound is also known as Aluminium Oxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Al2O3, or 101.961276 grams.
a compound contain 8.57g of carbon and 1.43g of hydrogen. The relative formula mass is 70 calculate the empirical formula of the compound and the molecular formula of the compound
Answer:
Empirical formula: CH2
Molecular formula: C5H10
1.25 x 1025 molecules of glucose (C H202) is
how many moles of glucose?
Answer:
1281.25 Moles of glucose
Explanation:
Multiply 1.25x1025= 1281.25
If we add 150mL of ammonia to 150mL of water, what is the concentration by volume?
Answer:
buffer solution
Explanation:
The mole fraction of NaCl in an
aqueous solution is 0.132. How
many moles of NaCl are present in
1 mole of this solution?
Answer: .132
Explanation:
Which organ system carries materials to human tissues?
Answer:
Cardiovascular they carry according to me
What is the solution to the following equation? Your answer
should use the correct number of significant figures.
(1.239 + 2.36 + 6.7800) -3.25 =
Answer:
7.129
Explanation:
1.239+2.36.6.7800
If 2.2 moles of calcium oxide are decomposed, how many moles of oxygen are produced?
2CaO --> 2Ca + O2
Answer: Since the reaction is 2Ca(NO3)2 = 2CaO + 4NO2 + O2
1) - given the stoichiometric coefficients, we know that 2 moles of Ca(NO3)2 will produce 4 moles of NO2, hence, 1 mole will produce 2 moles of NO2
2) - 328 g produces 22.4 L, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.
Hence, 65.6 g produces (65.6*22.4)/328 = 4.48 L
3) - 328 g produces 112 g CaO. Therefore, 65.6 g produces = (65.6*112)/328 = 22.4 g CaO.
4) - Given the stoichiometric coefficients, we know 5 moles of gaseous products are already being produces ( 4+1) by 2 moles of reactant.
5) - 44.8 L at STP = 2 moles of NO2, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.
Hence, to produce 2 moles of NO2, we need 1 mole of reactant = 164 g
Hope this helps :)
Explanation:
Select the correct answer.
Which two particles can form an ionic bond with each other?
A.
a negative oxygen ion and a negative chlorine ion
B.
a positive sodium ion and a positive magnesium ion
C.
a positive calcium ion and a negative oxygen ion
D.
a neutral fluorine atom and a negative sulfur ion
Answer:
C. a positive calcium ion and a negative oxygen ion
Explanation:
Ionic bonds are generally positive and negative because one is gaining electrons while the other is losing.
The term chemical bond generally refers to the attractive force that holds the constituent atoms or ions of a molecular species together. Here an ionic bond is formed between a positive calcium ion and a negative oxygen ion. The correct option is C.
What is an ionic compound?An ionic compound is formed by the transfer of one or more electrons between the atoms. An ionic bond or electrovalent bond refers to the strong electrostatic forces of attraction that hold together oppositely charged ions.
The number of electrons lost or gained by an atom of an element so as to acquire a stable octet configuration in its outermost shell is called the electrovalency of the element.
Here 'Ca' has 20 valence electrons and 'O' has 6 valence electrons. So in order to attain the stable octet configuration of 'Ar', 'Ca' loses two electrons whereas 'O' accepts two electrons to attain stable octet configuration of 'Ne'.
Thus the correct option is C.
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which of the following is unbalanced
A. SnO2 + H2 → Sn + 2 H2O
B. 2Na + 2H2O → 2NaOH + H2
C. N2O5 + H2O → HNO3
D. 2Fe + 3Cl2 → 2FeCl3
Answer:
The unbalanced chemical equation is;
C. N₂O₅ + H₂O → HNO₃
Explanation:
In balancing a chemical reaction equation, only the coefficients of the terms of the reactants and/or the products are adjusted (and not the subscripts to the atoms in the compounds) to ensure that the total number of each element is the same on either side of the arrow for the chemical reaction
A coefficient term is the number multiplier of the compounds and elements in a chemical reaction
Therefore, the balanced chemical equation is obtained by changing the coefficient of the product from the implied '1' to a '2' as follows;
N₂O₅ + H₂O → 2HNO₃
