Answer: potassium and rubidium
Explanation:
1) The group 1 of the periodic table contain six elements namely Lithium(Li), Sodium(Na),Potassium(K),Rubidium(Rb),Cesium(Cs) and Francium(Fr). These metals are called alkali metals because they form alkalies( i.e. strong bases capable of neutralizing acids) when they react with water.
2) The heavier alkali metals (K, Rb, and Cs) react so vigorously that they invariably explode.
3) This trend, which is not consistent with the relative magnitudes of the reduction potentials of the elements, serves as another example of the complex interplay of different forces and phenomena—in this case, kinetics and thermodynamics.
Pls answer this question 19 pls
Answer: The one direction where energy as heat will be initially transferred between the blocks is from block D to block A.
Explanation:
A substance like metal box that has high temperature will have more kinetic energy between its molecules due to which there will be more number of collisions between them.
Hence, it is able to transfer its heat energy more readily ac compared to a substance with low heat energy.
As a result, in the given diagram as temperature is increasing from block A to block B so heat energy will be transferred from block D to block A.
Thus, we can conclude that one direction where energy as heat will be initially transferred between the blocks is from block D to block A.
The one factor that a scientist changes during an experiment.
Answer:
The independent variable
Describe the surgery that would be used to treat Kayla's condition. What are the risks of the surgery?
Answer:
By pass surgery.
Explanation:
Kayla is suffering with blocked artery. The doctors have tried to open up her blocked artery with injecting the stunt by angioplasty process. The treatment had been unsuccessful and she is still complaining chest pain. The next move of the doctors would be by pass surgery which will open up the blocked artery. There are many risks involved in this surgery. The patient may get into coma due to excess bleeding or she may die if her blood pressure shoots up during surgery.
1. How are rates of chemical change expressed?
Explanation:
The rate of reaction is expressed as decrease in concentration of reactant or increase in product per unit time. It is also defined as the increase of concentration of the product per second.
Answer:
Explanation:
Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. ... It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.
I HOPE I HELPED PLZ GIVE A THANKS,RATE AND MARK ME AS BRAINIEST.
Which of the following molecules is polar?
CH3F
CF4
CCl4
All of the molecules are polar.
Answer:
CH3F
Explanation:
because if drawn out its is asymmetric
What is the rate of diffusion of NO gas to CO gas?
Answer:
0.97
Explanation:
Let R₁ represent the rate of diffusion of NO.
Let R₂ represent the rate of diffusion of CO.
Molar mass of NO (M₁) = 14 + 16 = 30 g/mol
Molar mass of CO (M₂) = 12 + 16 = 28 g/mol
Thus, the rate of NO to CO can be obtained as follow:
R₁ /R₂ = √(M₂/M₁)
R₁ /R₂ = √(28/30)
R₁ /R₂ = √(28/30)
R₁ /R₂ = 0.97
R₁ : R₂ = 0.97
NO : CO = 0.97
Therefore, the rate of diffusion of NO to CO is 0.97
2Na + 2H2O --> 2NaOH + H2 How many moles of NaOH can be produced from 7.0 moles of Na Find theoretical yield in moles PLSS HELP ME SOMEBODY 3
Answer:
[tex]n_{NaOH}=7.0molNaOH[/tex]
Explanation:
Hello there!
In this case, according to the given information about this problem, we first consider the given chemical reaction:
2Na + 2H2O --> 2NaOH + H2
Whereas there is 2:2 mole ratio of NaOH to Na; thus, we calculate the required theoretical yield of NaOH in moles as shown below:
[tex]n_{NaOH}=7.0molNa*\frac{2molNaOH}{2molNa} \\\\n_{NaOH}=7.0molNaOH[/tex]
Regards!
3 L of a gas at 250 K is changed to a temperature of 300 K. What is the final volume?
Answer:
you can simply answer vl\t1=v2/t2
32 pts (Help Ive been desperately waiting for a hour plz answer) What are the units of Specific Heat?
A. temperature
B. density
C. mass
D. energy
Answer:
D
Explanation:
If I am not mistaken the unit is Joules which is a unit of Energy.
Answer:
A C and D. (The one that isn't is density).
Explanation:
I don't think you are going to like the answer very much. The definition tells you that Specific heat has units of
Joules/(°Kelvin * mass in kg)
The reason you won't like this much is because there are three answers
temperature: °KEnergy: JoulesMass: kgYou won't be able to separate them. Once in a while you get a question like this where the asker didn't know the subject matter well, but was likely a good programmer.
What’s the charge on the ions formed by group 7 elements? (GCSE)
What is the approximate vapor pressure when the gas condenses at 70°C?
150
5
760
380
Answer:
380
Explanation:
I couldn't find the answer anywhere so this is the correct answer. I got it graded.
8. In some reactions the process of oxidation and reduction takes place simultaneously. What are these
reactions termed as? Explain giving a suitable example.
2
Ans.
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Answer:
zjtxxruxuxupm
Explanation:
fugilxltdptuszuourw passport RS a person Rd rseyozyoeToezyirzyorzrluziswzs the hell is going to thehdudb I have been a bit and then a email and your email find you by the way you can see the attached file is scanned image in PDF format and send it to the same
An atom of an element contains 12 protons, 12 neutrons, and 12 electrons. This element is in Group A) 1 B) 2 C) 6 D) 18
Answer:
B) 2
Explanation:
This is because the element in discussion is magnesium which has 12 protons and it falls in group 2 (the second column in periodic table)
what is acid? Explain it
Answer:
An acid is a chemical that is posining or sometimes not
Explanation:
This is the best I could explain brainliest
B 1. What type of signal is represented by discrete values?
A analog
B continuous
C sine wave
D digital
Answer:
digital signal is the answer
4 How can three liquids form something that resembles a solid? (Slime)
Answer:
Three liquids can form something that will resemble into a solid because it depends on which liquids you use and because all three things can work together to make it into a solid with the ingredients that are in all three liquids they will make into a beautiful piece.
Explanation:
This is the correct answer!!
The saturation point for a solution is 50.0 grams of solute per 500. grams of solvent. If you pour 70.0 grams of
solute into 800. grams of solvent, how many more grams of solute can you dissolve before reaching saturation?
Answer:
10.0g of solute before reaching saturation
Explanation:
A saturated solution is the solution that contains the maximum amount of solute that can be dissolved. In the problem, you can have
50.0g of solute / 500.0g Solvent
Now, in 800.0g solvent you can dissolve:
800.0g Solvent * (50.0g solute / 500.0g Solvent) = 80.0g of solute can be added
As you dissolve initially 70.0g of solute. You can add:
80.0g - 70.0g =
10.0g of solute before reaching saturationHigh levels and long periods of stress can increase a person’s risk for many diseases.
True
False
Answer:
true
Explanation:
During photosynthesis, plants incorporate atmospheric
Cinto more complex energy-storage
molecules that increase the mass of the plants. Plants need sunlight for this process because plants transform light
energy into
energy stored in the molecules.
Answer:
carbon dioxide
oxygen
**
During photosynthesis, plants incorporate atmospheric pressure into more complex energy-storage molecules that increase the mass of the plants. Plants need sunlight for this process because plants transform light energy into chemical energy stored in the molecules.
What is Photosynthesis ?
It is the process by which plants , algae and some bacteria uses water from the carbon dioxide, air and soil and in this process food is prepared in the presence of chlorophyll and sunlight. In this process light energy converted to chemical energy.
Thus, we can say that During photosynthesis, plants incorporate atmospheric pressure into more complex energy-storage molecules that increase the mass of the plants. Plants need sunlight for this process because plants transform light energy into chemical energy stored in the molecules.
Learn more about the Photosynthesis here: https://brainly.com/question/19160081
#SPJ2
Organize the following list of atoms from lowest to highest Electronegativity:
Beryllium, Barium, Strontium, Magnesium, Calcium
Answer:
Barium<Strontium<Calcium <Magnesium< Beryllium
Explanation:
Electronegativity is defined as the ability of an atom in a bond to attract the shared electrons of the bond towards itself.
Electronegativity is a periodic trend that decreases down the group and increases across the period.
Hence, if i want to arrange Beryllium, Barium, Strontium, Magnesium, Calcium in order of increasing electronegativity, i will have;
Barium<Strontium<Calcium <Magnesium< Beryllium
How symbols are made?
Answer:
Humans convert virtually all direct and indirect impressions into symbols. The symbols that humans create are words. Every word consists of two components, a denotative and a connotative (for a complete discussion of denotation and connotation see Chapter 7, THE POWER OF WORDS).
Explanation:
Answer:
Humans convert virtually all direct and indirect impressions into symbols. The symbols that humans create are words. Every word consists of two components, a denotative and a connotative (for a complete discussion of denotation and connotation see Chapter 7, THE POWER OF WORDS).
Explanation:
32.) What charge would you expect from a Group 17 atom when it becomes an ion?
a.) 1-
b.) 2-
c.) 2+
d.) 1+
PLEASE ANSWER QUICKLY!! LOTS OF POINTS!❤
Phosphorous has two common isotopes, phosphorous - 30 and phosphorous - 31. Using the periodic table what can you infer about these two isotopes?
Explanation:
The idea here is that you need to use the Periodic Table of elements to find the mass number of the most common isotope of phosphorus, P.
PLEASE ANSWER I GIVE BRAINLIEST AND MAX POINTS
Answer:
I believe the answer is A (changes in air temperature result in differences in air pressure which causes wind). Hope this helps
Explanation:
Does anyone have the chemistry paper 1 higher 2019 mark scheme thank you
no
Explanation:
i simply answered the question
you didnt ask for it you simply asked if i had it
being mad is no use, same with reporting and taking this down
in thoery my answer is correct
so, dont get mad, dot report, dont take this down
this is my protest
The total mass of reactants and products is _______ during a chemical reaction
Answer: The total mass of reactants and products is the same during a chemical reaction.
Explanation:
the total mass of reactants is equal to the total mass of products.
You have 1.29 moles of hydrogen peroxide, H2O2. How many grams is this?
Answer:
m = 43.87 grams
Explanation:
Given that,
Number of moles, n = 1.29 moles
The molar mass of H₂O₂ is, M = 34.0147 g/mol
We know that,
[tex]n=\dfrac{m}{M}[/tex]
Where
m is mass of H₂O₂
So,
[tex]m=n\times M\\\\m=1.29\times 34.0147 \\\\m=43.87\ g[/tex]
So, there are 43.87 grams of H₂O₂.
How many moles of gas would you have if you have a volume of 38.0 L under a pressure of 1430 mmHg at standard temperature
Answer: There are 3.2 moles of gas if you have a volume of 38.0 L under a pressure of 1430 mmHg at standard temperature.
Explanation:
Given: Volume = 38.0 L
Pressure = 1430 mm Hg (1 mm Hg = 0.00131579 atm) = 1.9 atm
Temperature = 273.15 K
Using ideal gas equation, the moles of gas will be calculated as follows.
[tex]PV = nRT\\[/tex]
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T =temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.9 atm \times 38.0 L = n \times 0.0821 L atm/mol K \times 273.15 K\\n = \frac{1.9 atm \times 38.0 L}{0.0821 L atm/mol K \times 273.15 K}\\= 3.2 mol[/tex]
Thus, we can conclude that there are 3.2 moles of gas if you have a volume of 38.0 L under a pressure of 1430 mmHg at standard temperature.
cultura de Australia ?
La cultura de Australia es una cultura occidental derivada principalmente de Gran Bretaña, pero también influenciada por la geografía única del continente australiano, la diversa aportación de aborígenes, isleños del Estrecho de Torres y otros pueblos de Oceanía. ... Los australianos son generalmente relajados, abiertos y directos.
how many moles are in 456 g of CaCO3
Answer:
4.556 moles
Explanation:
mole=mass/ molar mass
mole= 456/100.08
mole= 4.556