Answer:
E:ammonium chloride
F:sodium hydroxide
G:ammonia
2. Qualitative observations are ______. based on your senses measurable often taken using instruments only made by scientists in a laboratory
Qualitative observations are research methods based on your senses measurable often taken using instruments only made by scientists in a laboratory
What are Qualitative Observations ?The research method in which the data is collected either by using the five senses or by measurements, In this the qualities of the substance matter and not the quantity.
The qualitative observation is subjective and so varies from person to person.
Each research using the qualitative observation will be unique.
The data is collected using one to one interaction , by questionnaires , The data is non-numerical.
Qualitative observations are research methods based on your senses measurable often taken using instruments only made by scientists in a laboratory
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what is reacitivty series, and how you can access reactivity of metals...
In Chemistry, a reactivity series of metals , also known as the activity series refers to the arrangement of metals in the descending order based upon their reactivity .
Salient Features :-
The metal at the top of the reactivity series are powerful reducing agents since they are easily oxidized.The reducing ability of metals grows weaker while traversing down the series.The electro-positivity of metals also reduces while moving down the reactivity series.Metals that are placed higher on the reactivity series have the ability to displace metals that are placed lower in the series.The metal reactivity series is given below :-
To access the reactivity of metal , from the given reactivity series identify any of the metal and locate the reactivity based upon the choice of reactivity. The metal at the top (Potassium) is most reactive and the metal at the bottom (Platinum) is the least reactive.
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Two chemicals react in an endothermic reaction. what can be known about this reaction? the new substance will need more energy to form its chemical bonds than the old substance will release. more energy will be released from the old substance than the new substance will need to form its chemical bonds. a precipitate will form as a result of the reaction. a gas will form as a result of the reaction.
The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.
Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.
The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.
When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
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List the five main components of a nuclear reactor facility and explain why each part is important . Use details to support your answer
The five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, control rods, and a shield/containment system.
What is a nuclear reactor?Nuclear reactors are the main parts of the nuclear power plant. They run the nuclear power by initiating the nuclear reactions which produce heat.
Thus, the five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, a shield/containment system, and control rods.
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describe one way the respiratory and nervous system work together
The respiratory system supplies oxygen to the blood and removes carbon dioxide. The brain monitors respiratory volume and blood gas levels. The brain regulates respiratory rate.
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One way the respiratory and nervous systems work together is through the control of breathing rate and depth based on the body's oxygen and carbon dioxide levels.
Chemoreceptor Response to Gas Levels:
Specialized sensors called chemoreceptors are located in the blood vessels, particularly in the aorta and carotid arteries, which detect changes in the levels of oxygen and carbon dioxide in the bloodstream. These chemoreceptors are part of the nervous system and play a crucial role in regulating breathing.
When the oxygen level in the blood decreases or the carbon dioxide level increases (indicating a need for more oxygen or removal of excess carbon dioxide), the chemoreceptors send signals to the brainstem, specifically to the medulla oblongata and pons. These regions of the brain are responsible for controlling involuntary processes like breathing.
The nervous system, upon receiving these signals, responds by adjusting the rate and depth of breathing to ensure that the body's oxygen and carbon dioxide levels remain within a healthy range.
For example, if the oxygen level drops due to increased physical activity, the nervous system stimulates an increase in breathing rate to bring in more oxygen. Similarly, if carbon dioxide levels rise (as during intense exercise), the nervous system triggers deeper and faster breathing to expel excess carbon dioxide.
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8. How does water vapor get into the troposphere in the first place?
Answer:
Water vapor enters the atmosphere through evaporation from water bodies (oceans, seas, lakes, rivers), ice/snow cover and soil, as well as through evapotranspiration from vegetation
Explanation:
The cycle, which occurs in the troposphere, begins as the sun evaporates large amounts of water from the earth's surface and the moisture is transported to other regions by the wind. As air rises, expands, and cools, water vapor condenses and clouds develop
Identify which substitution product is expected to be favored. Explain. The inverted product is expected to predominate slightly, due to SN2 competition. The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
What is substitution product?Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.
Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
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Find the value of c with the correct number of significant
figures from the equation a-b-c = 401, if a = 1387.11 and b =
928.321.
Answer:
19-73 70-65-46 78-59-86 84-64
The value of c from the given equation is equal to 58.
What are significant figures?Significant figures can be used to create numbers and these numbers can be written in the form of digits. We can determine the number of significant figures by counting the values from the first non-zero figure placed on the left.
In the case of multiplication or division, the number of significant figures must be the same as the value with the minimum significant figures. The significant digits of a given number can be defined as those significant figures, which deliver the meaning relative to its accuracy.
The answer is rounded off in such a manner so it will have the digits after the decimal as the least precise number have the same number of digits after the decimal.
Given the equation can be written as:
a - b - c = 401.0
The value of a = 1387.11
The value of b = 928.321
By substituting the values of 'a' and 'b' in the given equation we can evaluate the value of 'c':
1387.11 - 928.321 - c = 401.0
c = 458.79 - 401.0
c = 57.79
c = 58
Therefore, the value of c is equal to 58.
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A sample of gas with a volume of 30.0 ml at 25.0c is heated to 50.0c what is the new volume of the gas
Answer:
The new volume is 60ml
Explanation
using the equation p1v1/n1t1=p2v2/n2t2 we would divied 30 by 25 the multiply by 50 to get 60
which radioactive waste can be stored for decay and then safely released into the environment?
N-16
Sr-90
Cs-137
Pu-239
The radioactive waste can be stored for decay and then safely released into the environment is N-16.
What are the types of decay?Decays can be of three types: alpha, beta and gamma. Each of them corresponds to a different radioactive particle, which changes the nucleus of the emitting atom according to its characteristics.
Nitrogen 16 ( 16 N ) is the unstable isotope of nitrogen whose nucleus consists of 7 protons and 9 neutrons. Its period is 7.13 s.
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Select the correct answer from each drop-down menu. Amy put some salt in a weighing dish. Then she put the weighing dish on a sensitive balance to measure the mass of the salt. She removed the weighing dish from the balance and put it in several similar balances. She recorded the mass each time.
Mass 1 Mass 2 Mass 3 Mass 4 Mass 5 5.608 g 5.607 g 5.608 g 5.608 g 5.609 g
Amy forgot to subtract the mass of the empty weighing dish from her measurements, and she reported the mass of the salt as 5.608 grams. Amy's measurement of the salt's mass(1)______ accurate because(2)______ . Amy's measurement of the salt's mass(3)_____precise because(4) _______ .
1. A. is B. is not
2.
it is not close to the actual value
she used five different balances
the individual measurements are similar
3. is
is not
4. it is not close to the actual value
she used five different balances
the individual measurements are similar
Answer:
is wrong as she fogot to do something at the start and it is not a fair test
Explanation:
first she need to use the same with in plate second she needs to make the weighs not measure the dish third when the weighs are on 0 put your ingredient on
ps i have dislexia
Which element has the largest atomic radius?
Answer:
Ba
Explanation:
Atomic radius increases going right to left, and up to down.
So the closest element to the bottom left corner is Ba.
Perform the following operation and express the answer in scientific notation 8.6500x10^3+6.5500x10^5
Taking into account the scientific notation, the result of the sum is 6.6365×10⁵.
Scientific notationFirst, remember that scientific notation is a quick way to represent a number using powers of base ten.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Sum in scientific notationYou want to add two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found.
In this case, the highest exponent is 5.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 8.6500×10³= 0.086500×10⁵
Taking the quantities to the same exponent, all you have to do is add what was previously called the number "a". In this case:
0.086500×10⁵ + 6.5500×10⁵= (0.086500+ 6.5500)×10⁵= 6.6365×10⁵
Finally, the result of the sum is 6.6365×10⁵.
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Prove that: F = Gm₁m₂ /d^2
Answer:
hope it helps
and give brainliest
What kind of reaction is this ?
approximately how often does the moon revolve around the earth?
o every 365 days
every 30 days
daily
o every season
Answer: A
Explanation: NO CAP..................... A!!!!!!!!!!!!!!
In a simple distillation setup, what is the sequence of equipment from the bench top to the round bottom flask
In a simple distillation setup, the sequence of equipment from the bench top to the round bottom flask is:
ThermometerDistillation flaskLiebig condenserRound bottom flaskBunsen burnerWhat is Distillation?This is the process in which a mixture is separated through selective boiling and condensation.
The distillation flask and liebig condenser are usually located above the round bottom flask in the set up.
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Ammonium hydrogen sulfide (NH4HS) can
decompose to ammonia and hydrogen sulfide:
NH₂HS(S)NH₂(g) + H₂S(g)
What is the equilibrium constant expression for
this system?
[tex]K_c = \frac{[NH_2]^{1}[H_2S]^{1}}{[NH_2HS]^{1}}[/tex] is the equilibrium constant expression for
NH₂HS(S) → NH₂(g) + H₂S(g). Hence, option A is correct.
Definition of equilibrium constant.A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
Equilibrium constant for the NH₂HS(S) → NH₂(g) + H₂S(g) will be:
[tex]K_c = \frac{[Product]^{coefficient}}{[Reactantt]^{coefficient}}[/tex]
[tex]K_c = \frac{[NH_2]^{1}[H_2S]^{1}}{[NH_2HS]^{1}}[/tex]
Hence, option A is correct.
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How many liters is 3.3 moles of a gas? Please show work.
At STP 1 mole of gas occupies a volume of 22.4 liters. So 3.3moles of gas at STP7 will theoretically occupy 22.4*3.3-74 liters
Calculate the % composition of the unknown liquid using your most precise result. It is a mixture of ethanol (D[ETOH] = 0.7890 g/mL) and water. We will assume the temperature was 20.0 °C in the lab and the density of water was D[H2O] = 0.9982 g/mL.
% composition of ethanol = 34.51%
% composition of water = 65.49%
What is density?A material's density is defined as its mass per unit volume.
Given data:
The density of ethanol = 0.7890 g/mL
The density of water = 0.9982 g/mL
The density of mixture = 0.926 g/mL
Let the % composition of ethanol = x
Let the % composition of water = 100-x
Now density of the mixture
[tex]\frac{Mass}{Volume}[/tex]
[tex]Mass = \frac{percent \;of \;ethanol \;X \;density \;of \;ethanol \;+ \\ \;percent \;of \;water X \;density \;of \;water}{100}[/tex]
[tex]0.926 = \frac{x X 0.7890 g/mL \;+ (100-x) X 0.9982 g/mL}{100}[/tex]
[tex]x= 34.51[/tex] %
Hence,
% composition of ethanol = 34.51%
% composition of water = 65.49%
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What must happen for carbon dioxide to sublimate at a given pressure ?
Answer:
If the pressure is reduced on the solid carbon dioxide the temperature will drop and the liquid carbon dioxide will solidify into snow-like substance.
Explanation:
if energy can neither be created nor destroyed, into what kinds of energy have these resources been transformed?
Answer:
Heat, Sound
Explanation:
I am pretty sure you are addressing mechanical energy and machine efficiency. So you are probably aware a machine can't achieve 100% efficiency because of the first and second laws of thermodynamics. This energy is lost to friction and air resistance. They convert some gravitational potential energy to heat and sound energy rather than all to kinetic energy, and vice versa.
Hi! I am struggling with this problem and if anybody can correctly answer this problem I would gladly appreciate it, thanks!
....................
Answer:
43.2 x 10⁻¹¹
Explanation:
The rate law equation for the reaction is:
Rate = k[CH₃CHO]²
In the table, you are given some of the concentrations and rates. What you are not given is the value of "k". Since you are only given the concentration in Trial 3, you need to know the value of "k" in order to find the rate. To find this value, plug the information from one of the trials into the equation and simplify to find "k".
Rate = k[CH₃CHO]²
2.70 x 10⁻¹¹ = k[2.00 x 10⁻³]²
2.70 x 10⁻¹¹ = k[4.00 x 10⁻³]
6.75 x 10⁻⁶ = k
Now that you know the value of "k", you can use it and the concentration from Trial 3 to find the rate.
Rate = k[CH₃CHO]²
Rate = (6.75 x 10⁻⁶)[8.00 x 10⁻³]²
Rate = (6.75 x 10⁻⁶)[6.4 x 10⁻⁵]
Rate = 4.32 x 10⁻¹⁰ -------> 43.2 x 10⁻¹¹
How many NH3 molecules are produced by the reaction of
4.0 mol of Ca(OH)2 according to the following equation:
(NH4)2SO4 + Ca(OH)2 → 2 NH3 + CaSO4 + 2 H₂O
Answer:
1 mol Ca(OH)2 produces 2 mol NH3
4 mol Ca(OH)2 will produce 8 mol NH3
1 mol NH3 contains 6.022*10^23 molecules NH3
8 mol NH3 contain 8*6.022*10^23 = 4.8*10^24 molecules NH3
Explanation:
Which energy source has been developed and improved by chemists?
A. coal
B. wind
C. battery
please don't say nuclear as it is quite literally not a choice.
**asap!!** can someone write me a balanced equation with this sundae recipe
1. 12 banana hands
2. 2 bottles of chocolate syrup
3. 12 breyers vanilla ice cream
4. 2 containers of candy cherries each have 30 cherries.
5.1 bottle of whipped cream
Answer:
12 banana hands + 2 bottles of chocolate syrup + 12 scoops of Breyers ice cream + 2 containers of candy cherries(30 cherries/per) + bottle of whipped cream.
Explanation:
Hope this helps!
Based on the data table, answer the following questions: 1. based o
n the results in the test for starch (carbohydrates), which food samples tested positive?
2. based on the results in the test for reducing sugar (carbohydrates), which food sample tested negative?
Rice, pasta,sugar and chocolate tested positive for starch while water tested negative for reducing sugar.
What is Carbohydrate?
This is an organic compound which consists of carbon, hydrogen and oxygen.
It consists of sugars, starch etc in which the food mentioned above also contain them which is why they were chosen as the appropriate choice.
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How do scientists answer questions?
OA. By making observations and performing experiments
OB. By listening to the ideas of others and choosing the best one
OC. By writing papers that support their opinions
OD. By reading reliable sources on the subject they are interested in
Could someone help me with this please
Answer:Your can use the internet There is a web site that is called periodic table.com it is very use full
Explanation:Have fun
what mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 of water
The mass, in grams, of hydrogen that would be produced from the reaction will be 0.102 grams
Stoichiometric calculationsFrom the balanced equation of the reaction:
[tex]Mg + 2H_2O -- > Mg(OH)_2 + H_2[/tex]
The mole ration of magnesium to water is 1:2.
Mole of 4.73 grams Mg = 4.73/24.3 = 0.195 moles
Mole of 1.83 grams water = 1.83/18 = 0.102 moles
Hence, water is limiting.
Mole ratio of water to the hydrogen produced = 2:1
Equivalent mole of hydrogen gas produced = 0.102/2 = 0.05 moles
Mass of 0.05 moles hydrogen gas = 0.05 x 2 = 0.102 grams
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