Answers
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
Related Questions
Write a balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO).
Answers
Answer:
2Ca +O2 ----------> 2CaO ( Balanced Reaction)
The balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO) is
Ca + O2 --> CaO2
Heya are balanced equations?A balanced chemical equation is an equation in which the the number of atoms of each elements on both the reactant and products sides are equal.
Calcium oxide is an alkaline which is solid at room temperature and is formed by the reaction of one atom of calcium and two atoms of oxygen.
Therefore, the balanced equation of formation reaction of solid calcium oxide (CaO) is Ca + O2 --> CaO2.
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How to create a good statement of the problem?
Answers
which of the following are examples of single replacement reactions select all that apply.
1) Ca(OH)2(aq) + 2 HCl(aq) ----> CaCl2(aq) + 2 H2O(l)
2)Mg(s) + Zn(NO3)2(aq) ------> Mg(NO3)2(aq) + Zn(s) 3)Na2S(aq) + Cd(NO3)2(aq) ----> 2 NaNO3(aq)
4) K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g)
Answers
Answer:
4
Explanation:
please mark brainiest
K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g) is an example of single replacement reactions.
What do you mean single replacement reactions?A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound.
Single-replacement reactions always involve two pure elements and one aqueous compound/solution. In the above reaction, the A and C would be pure elements.
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
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Hi ! ❤️looking for help you can look at my past questions. giving brainliest if able to
Fill in the blanks. Liquid B is ____________________ then liquid A and liquid B would ___________________ liquid A.
1: more dense, sink under
2: less dense, sink under
3: more dense, float on top of
4: less dense, float on top of
Answers
Answer:
I think it's number one option
Why do you think some seasons are more likely than others to experience a tornado
Answers
Why should A chemical equation be balanced?
A. To show that the reactants are compounds
B. To show metals from nonmetals
C. To show ionic compounds
D. To show the law of conservation of mass
Please answer. No links please!!!
Answers
MARKING BRAINIEST HURRY!!
Read the following statement:
For every action, there is an equal and opposite reaction.
Does the statement describe a scientific law?
Yes, because it describes action-reaction force pairs
No, because it describes action-reaction force pairs
Yes, because it is applicable to a single or only a few events in the natural world
No, because it is applicable to a single or only a few events in the natural world
Answers
Yes, because it describes action-reaction force pairs
Help with science ASAP!! Will give brainliest!! :)
Answers
B
Explanation:
20.0g+25.0g+30.0g=75.0g
75.0g/3=25.0g
How long does it take for a car driving at 10m/s to move 200m?
A.
0.05 seconds
B.
2 seconds
C.
20 seconds
D.
2000 seconds
Answers
Explain:
10=1
200=?
200/10=20
The time taken by the car driving at 10m/s to move 200m is 20 seconds. The speed of car is 10m/s. Thus option C is correct.
What is speed?Speed is defined as a measurement of the length of time it takes for an object to travel a certain distance.
The SI unit of speed is m/s, and speed is defined as the ratio of distance to time.
A change in speed is an example of acceleration because it is a change in velocity. Acceleration could be for positive or negative. Deceleration is another name for negative acceleration.
There are four types of speed.
Uniform speedVariable speedAverage speedInstantaneous speedSpeed can be expressed as
Speed = Distance / Time
Given, Distance = 200 m
Time = 10 m/s
Speed = 200m / 10m/s
= 20 seconds
Thus, the time taken by the car driving at 10m/s to move 200m is 20 seconds. The speed of car is 10m/s. Thus option C is correct.
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r.
3. How are elements on the periodic table
arranged? sc.8.P.8.6
A atomic mass
B atomic number
© chemical symbol
D state of matter
no
Answers
How many moles of CH 3CH 2OH are contained in 280 mL of 0.0788 M CH 3CH 2OH solution?
Answers
4.32×10−2mol hope it helps
Each atom consists of a central nucleus and several shells that contain electrons. The outermost electrons are called valence electrons. Most atoms are stable with a configuration of eight valence electrons. This is known as the octet rule. How many valence electrons does each atom have? * 1 point
Answers
Explanation:
Not only did outermost electron determine the valence electron, but also periodic table. whatever group they fall into in periodic table each valence electrons present in a particular atom e.g K and Ca belong to group 1 and 2 respectively and k has 1 and Ca have 2 in each outermost electron
How many significant figures are in the following number? 3,000.0 x 10⁴ grams
Answers
Answer:
5 significant figures.
Explanation:
The decimal place makes the zeros significant.
Can anyone help me with this?
Answers
Answer:
Label 2
Explanation:
Earth is about 2/3 of the way up the Orion Arm of the Milky Way Galaxy
♔♔what is tincture of iodine?what is it's use?✞☽☻☾✞
Answers
Answer:
Iodine tincture also known as weak iodine solution is a combination of iodine, sodium iodide, ethanol, and water. It is a disinfectant or antiseptic.
Applications:
When we get cuts and scratches it is applied. It is used mainly to clean the skin to prevent bacterial infections.
Explanation:
Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot.^_^
Please answer 39 and beyond
Answers
40) 1.09 cm
41) 2.79 m
42) 29.74 g/mL
43) a. 6.730 x 10^-4
b. 5.0 x 10^4
c. 3.010 x 10^-6
44) a. 7050 g
b. 40000500 mg
c. 23500 mL
Using what you know about models, write an explanation from the following prompt
Answers
HOPE IT HELPS YOU
CAN YOU BRAINLEST ME
How many grams of NaBr must he measure out to have 4.20 moles?
Answers
Answer: 432 grams
Explanation:NaBr must he measure out to have 4.20 moles.
Why do scientists use remotely operating vehicles (ROVs) in scientific study?provide an example of their use
Answers
Answer:
Remotely operated vehicles, or ROVs, allow us to explore the ocean without actually being in the ocean. ... Additional equipment, such as a manipulator or cutting arm, water samplers, and instruments that measure parameters like water clarity and temperature, may also be added to vehicles to allow for sample collection.
Explanation:
How many grams of O2 are present in 44.1 L of O2 at STP?
a.10.0 g
b.16.0 g
c.32.0 g
d.410.0 g
e. 63.0 g
Answers
Taking into accoun the STP conditions and the ideal gas law, the correct answer is option e. 63 grams of O₂ are present in 44.1 L of O2 at STP.
First of all, the STP conditions refer to the standard temperature and pressure, where the values used are: pressure at 1 atmosphere and temperature at 0°C. These values are reference values for gases.
On the other side, the pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances.n is the number of moles of the gas.Then, in this case:
P= 1 atmV= 44.1 Ln= ?R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 0°C =273 KReplacing in the expression for the ideal gas law:
1 atm× 44.1 L= n× 0.082 [tex]\frac{atmL}{molK}[/tex]× 273 K
Solving:
[tex]n=\frac{1 atm x44.1 L}{0.082\frac{atmL}{molK}x273K}[/tex]
n=1.97 moles
Being the molar mass of O₂, that is, the mass of one mole of the compound, 32 g/mole, the amount of mass that 1.97 moles contains can be calculated as:
[tex]1.97 molesx\frac{32 g}{1 mole}[/tex]= 63.04 g ≈ 63 g
Finally, the correct answer is option e. 63 grams of O₂ are present in 44.1 L of O2 at STP.
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https://brainly.com/question/4147359?referrer=searchResultsWhich is a strong base?
A. HCl
B. NaOH
C. NH3
D. H3CO3
Answers
Answer:
c
Explanation:
Answer:
B
Explanation:
Chemical contamination is more likely to
occur under which of the following
situations?
When cleaning products are not stored properly
When dishes are sanitized with a chlorine
solution
When raw poultry is stored above a ready-to-eat
food
When vegetables are prepared on a cutting
board that has not been sanitized
Answers
Chemical contamination is likely to occur when cleaning products are not stored properly.
Chemical contamination refers to the introduction of harmful chemicals into food, water or the environment. These chemical substances may come in contact with food and water in many ways.
The most common sources of chemical contamination are chemical substances that are not properly stored.
Hence, chemical contamination is likely to occur when cleaning products are not stored properly.
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I am giving the brainliest answer too
Explain… What are the subatomic particles of an atom, and where are they located in the atom? Be specific.
Answers
Atomic Particles
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
I hope its help2.
Which form of cell division produces four cells with chromosomes different from the
parent cell?
B
budding
dominant
meiosis
Dmitosis
Answers
Answer:
meiosis
Explanation:
An image of Earth's layer is above.
Which layer is the most dense?
layer A
layer B
layer C
layer D
Answers
Answer:
Layer D
Explanation:
Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.
Based on the activity series you created in part C, predict whether there would be a chemical
reaction or no reaction when the listed pairs of substances are combined.
BI U X
X Х.
Font Sizes
А -
А
EEE 를 들 들
Substances
Reaction or No
Reaction
I
magnesium and copper(1)
sulfate
iron and magnesium sulfate
copper and iron(III) nitrate
magnesium and hydrochloric
acid
Answers
Answer:
first one is no reaction and the rest are reaction
Explanation:
We mix 88 grams of oxygen gas with 33 grams
of argon gas in a volume of 2400 mL at 62◦C.
What will be the final pressure of the gas
mixture?
Answers
The final pressure of the gas mixtures is 72.48 atm.
The given parameters;
mass of the oxygen = 88 gramsmass of the argon, = 33 gramsvolume of the gaseous mixture, V = 2400 mL = 2.4 LThe number of moles of the gases is calculated as follows;
[tex]number \ of \ moles \ of \ oxygen = \frac{88}{16} = 5.5 \ moles\\[/tex]
[tex]number \ of \ moles \ of \ argon = \frac{33}{40} = 0.825 \ moles\\[/tex]
The total number of moles of the gas mixture;
= 5.5 + 0.825
= 6.325 moles
The final pressure of the mixture is calculated as follows;
PV = nRT
[tex]P = \frac{nRT}{V} \\\\P = \frac{6.325\ mol \times (0.0821 \ L.atm/mo.K) \times (62+273)}{2.4 \ L} \\\\P = 72.48 \ atm[/tex]
Thus, the final pressure of the gas mixtures is 72.48 atm.
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♔♔Can water stay liquid below zero degrees Celsius?✞♡♡♡
Answers
Answer:
Yes, water can stay liquid below zero degrees Celsius. There are a few ways in which this can happen. The freezing point of water drops below zero degrees Celsius as you apply pressure. When we apply pressure to a liquid, we force the molecules to get closer together.
Explanation:
Hope this helps you. Have a nice day.^_^
Please mark as brainliest. It helps a lot:)
Answer:
yes water can stay liquid below 0 ° Celsius
which chemical formal shows an ionic compound? A. CO2 B.N 2 O C.NaCI D.C6 H12 O6
Answers
Answer:
B
N2O
Explanation:
maybe
d can also be lol
Americans drink 5,604,000 gallons of sweet tea each day. How many liters is
that? (1 gal = 3.79 L)
Answers
5604000gallon =21239160 liters