Answers
Answer:
all are metals and they will form oxide in air
Related Questions
Perform the following
mathematical operation, and
report the answer to the correct number of significant figures.
0.008/51.3
[?] x 10^[?]
Answers
Answer: 2x10^-4
Explanation:
This is easy stuff
what is the product(s) in the reaction below
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Answers
Answer:
Aqueous sodium hydroxide and hydrogen gas
help please ? i’m being timed andnjdjd
Answers
Answer:
the last 2
Explanation:
pls mark me brainliest
While watching a popular space-based science fiction movie, space
vehicles loudly shoot each other with lasers and explode with a booming
sound. Students of science know that sound does not travel through
space and these movie scenes showing space sounds are factually
incorrect. Why are there no sounds in space?
Answers
Answer:
Sound waves required a medium.
Explanation:
In space, there is only vacuum hence no any medium for sound wave travel.
Since sound waves are mechanical waves, they require a material medium such as air, hence no sound transmission.
Answer: There is no air.
Explanation:
Because there is no air in space, there is no way for air to travel in space.
Air needs to push on your eardrums or air in general to move through space when there is no air your eardrums won’t move from the air making it quiet.
what do the letters in the boxes of the periodic table represent
Answers
Answer:
The letters are a one- or two-letter symbol assigned to each element.
Explanation:
Use the periodic table to identify the element indicated by each electron configuration by typing in the
chemical symbol for the element.
Answers
Answer:
Explanation:
1s22s22p6: Ne 1s22s22p63s23p3: P 1s22s22p63s23p64s1: K 1s22s22p63s23p64s23d8: Ni 1s22s22p63s23p64s23d104p65s24d3: Nb
We have that an element indicated by its electron configuration, we can determine its Atomic number by selecting the electron represented on each orbit of the atom around the nucleus
Hence using the Periodic table to read the its Atomic Number
The Periodic table is categorized using the atomic number of elements and symbols are to aid search as well
For an element indicated by its electron configuration we can determine its Atomic number by selecting the electron represented on each orbit of the atom around the nucleus
Hence using the Periodic table to read the its Atomic Number
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How much heat does it take to turn water from -30 degreesC to 120 degreesC?
If you actually know the answer please tell me! ASAP!!!
Answers
Answer:
110 degrees C
Explanation:
110 degrees
is your answer
Convert the scientific notation to a decimal number. Type the correct answer in the box. 4 × 10-5 cm = cm
Answers
Answer:
[tex]4 * 10^{-5}cm = 0.00004cm[/tex]
Explanation:
Given
[tex]4 * 10^{-5}cm = [\ ]cm[/tex]
Required
Solve
Apply law of indices
[tex]4 * \frac{1}{10^5}cm = [\ ]cm[/tex]
Evaluate 10^5
[tex]4 * \frac{1}{100000}cm = [\ ]cm[/tex]
[tex]4 * 0.00001cm = [\ ]cm[/tex]
[tex]0.00004cm = [\ ]cm[/tex]
Hence:
[tex]4 * 10^{-5}cm = 0.00004cm[/tex]
if you drink 2 grams of mg(oh)2 how many grams of hcl are neutralized
Answers
Answer:
0.073 g
here is to keep in mind that you need 2 moles of hydrochloric acid in order to neutralize 1 mole of magnesium hydroxide.
Explanation:
. Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9.
To which group in the Periodic Table does it belong?
a ] I
B] III
C] VII
D] 0
Answers
Answer:
C
Explanation:
it belong to that group as it needs 1 electron to be chemically stable
Which set of measurements correctly identifies the speed of an object?
A.
Distance = 18 m
time = 2 hr
speed = 9m/hr
B.
Distance = 30 km
time = 17 min
speed = 1.8 km/hr
C.
Distance = 3 cm
time = 12 min
speed = 36 cm/min
D.
Distance
2 km
time = 24 sec
speed = 48 km/sec
Answers
Answer:
A. Distance = 18 m
time = 2 hr
speed = 9 m/hr
Explanation:
Speed is the same thing as velocity.
Velocity = distance/time
18m/2hr = 9m/hr
For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)
How many moles are in 6.3x1054 molecules of Ca(C2H202)2?
Answers
In chemistry, the molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles. It is the mass of 1 mole of the substance or 6.022×10²³ particles, expressed in grams.
4. How is ethanol made?
A. By fermenting sugars and starches
B. By composting grass cuttings and dinner table scraps
C. By boiling water and corn oi
D. By releasing carbon dioxide into the atmosphere
O
Answers
Pls help
Three gases are added to a single tan of the same size. The first gas is currently at 303.9kPa, the second at 1900tor and the third at 132.3PSI. To one
decimal place, what are the percentages for each gas of the total pressure in the tank?
Answers
Answer:
See Explanation
Explanation:
We must first convert the gas pressures to a common unit. I choose to convert all pressures to kiloPascal.
Since;
1 kilopascal = 7.501 torrs
X. =1900tor
X= 1900 × 1/7.501
X= 253.3 Kpa
Since 1 PSI =6.895 kilopascals
132.3PSI = 132.3 × 6.895/1
= 912.2 Kpa
Total pressure = 303.9kPa + 912.2 Kpa + 253.3 Kpa = 1468.8 kPa
For first gas;
303.9/1468.8 × 100 = 20.7%
For second gas;
912.2/1468.8 × 100 = 62.1%
For the third gas;
253.3/ 1468.8 × 100 = 17.2%
2. Heat changes during changes of state
A. Boiling water (2.5 pts)
Water boils at 100 °C. You boil a pot containing 500 g of water for 10 minutes.
What is the temperature of the water after 10 minutes of constant boiling? (hint this question
does not require any math).
Explain or justify your answer by discussing heat and state change.
B (2.5 pts) Boiling off a pot of water
A pot containing 500 g of water is brought to a boil. The later heat of vaporization is for water H=2260 kJ/kg
How much heat will it take to completely boil the water (turn it all to steam) of water is brought to a boil.
Answers
Answer: A) it remains at a 100 B) 1130J
Explanation:
A) Water boils at a hundred after which further heat is used up to break bonds in order to allow water to boil rather than being used up to increase the temperature of the water that is boiling.
B) Energy/heat = specific latent heat x mass
E = 2260 x 0.5 (kg)
E = 1130 J
substance which speed up the rusting process
Answers
Answer:
salt solution speeds up rusting processing
Answer:
Salt solution acts as an electrolyte (any substance containing free ions that allows the substance to conduct electricity) allowing iron to lose electrons more easily and so speeds up the rusting process
I hope it helps
One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements? Explain your answer
Answers
Answer: Both the given species are isotopes of the same element.
Explanation:
An isotope is defined as the chemical species that have the same atomic number but a different mass number.
The atom consists of 3 subatomic particles:
Protons: They are positively charged particles present in the nucleus of an atom. Electrons: They are negatively charged particles present in the orbits around the nucleus of an atom. Neutrons: They are neutral particles present in the nucleus of an atom.An atomic number is defined as the number of protons or number of electrons present in a neutral atom. It remains specific for a particular element.
Mass number is defined as the sum of the number of protons and neutrons present in the nucleus of an atom.
Given values:
For isotope 1:
Number of protons = 11 = atomic number
Number of neutrons = 13
Mass number = 11 + 13 = 24
For isotope 2:
Number of protons = 11 = atomic number
Number of neutrons = 12
Mass number = 11 + 12 = 23
As the atomic number of both the isotopes is the same. Thus, they belong to the same elements.
Hospital patients are administered oxygen from an pressurized
hyperbaric oxygen chamber. 600.0 L of oxygen is compressed in a
cylinder at 160.0 atm. What volume of oxygen can a cylinder supply at a
pressure of 3.0 atm?
Answers
Answer:
32000atm
Explanation:
Using Boyle's law equation;
P1V1 = P2V2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (
V2 = final volume (L)
According to the question below:
P1 = 160.0 atm
P2 = 3.0 atm
V1 = 600L
V2 = ?
Using P1V1 = P2V2
160 × 600 = 3 × V2
96000 = 3V2
V2 = 96000/3
V2 = 32000atm
Please answer correctly I still need help on this. I will give brainliest (No links or fake answers will receive no brainliest)
How many grams of AlCl3 are needed to completely react with 2.25 of NaOH?
Answers
Hope the picture help u understand I did it in steps so it would be easier to understand:)
How many liters of Cl2 gas will you have if you are using 63 g of Na?
Answers
Answer:
You will have 19.9L of Cl2
Explanation:
We can solve this question using:
PV = nRT; V = nRT/P
Where V is the volume of the gas
n the moles of Cl2
R is gas constant = 0.082atmL/molK
T is 273.15K assuming STP conditions
P is 1atm at STP
The moles of 63g of Cl2 gas are -molar mass: 70.906g/mol:
63g * (1mol / 70.906g) = 0.8885 moles
Replacing:
V = 0.8885mol*0.082atmL/molK*273.15K/1atm
V = You will have 19.9L of Cl2
Th following diagram is an example of a(n) [Hurry!!]
A. Covalent Bond
B. Ionic Bond
C. Metallic Bond
Answers
The following diagram is an example of a(n) [Hurry!!]
A. Covalent Bond ✓ answer
B. Ionic Bond
C. Metallic Bond
Answer:
This is the diagram of covalent bond
What is the difference between an element and a compound? (p.s. it due in 5 mins ASAP so hurry.)
Answers
Explanation:
An element just has one-type atoms/atom (e.g. O2). Meanwhile, a compound is a variety of atoms (e.g. H2O).
Scientists have observed that hurricanes are strongest over water, and that hurricanes lose momentum and become weak when they reach land. Which statement best explains this observation?
The ocean tides provide energy to hurricanes.
The ocean winds provide energy for hurricanes.
The warm water provides moisture for hurricanes.
The Coriolis Effect provides moisture for hurricanes.
Answers
Answer:
Explanation:
The warm water provides moisture for hurricanes so that hurricanes are strongest over water, and become weak when they reach land.
What is hurricane?Hurricanes are forceful winds in the air which are able to destroy even a land completely. One of the most destructive forces on earth is the hurricane. Although the process of a origin of hurricane is complex.
They need water that is at least 80 degrees first. Air that is wet is the second component. Finally, for a hurricane to form, there must be convergent winds.
A group of thunderstorms moving across the ocean's surface signal the start of the real process. Similar to how a straw absorbs liquid, when the surface water is heated, the storm absorbs heat energy from the water. The air becomes moistened as a result.
The storm can develop into a hurricane if the wind conditions are right. The fuel is this thermal energy. Hence, option c is correct.
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Please help me school ends tomorrow
Which scenario describes a transfer of mechanical energy to heat and sound energy?
Question 7 options:
A)
a plant using energy from the sun to create food
B)
a very high pitched sound causing a glass to break
C)
talking into a microphone.
D)
clapping hands
Answers
Answer:
D) clapping handsExplanation:
hope it's helpful
Which of these solutions has the highest vapor pressure at 25°C?
A. 0.10 Molar C6H1206
B. 0.10 Molar NaF
C. 0.10 Molar MgCl2
D. 0.10 Molar K3P04
Answers
Solution :
We know, In an electrolyte solution, the number of dissolved particles is larger because the solute breaks apart into ions. The greater the number of ions, the larger the impact on colligative properties will be.
So, the compound which will dissociate into more number of electrolyte has more vapour pressure.
Out of all given compound K₃PO₄ have highest number of particles after dissociation.
Hence, D) is the required solution.
500 ml of 3.31 M HCl is mixed with 56.1 g NaOH to produce water and table salt.
What mass of NaCl is produced?
ss
Answers
Answer:
m=1,48g
Explanation:
In the food chain below, what energy is available to the wolf?
A. Some of the energy transferred from the Sun, to the grass, to the deer.
B. All of the energy transferred from the Sun, the grass, and deer.
C. All of the energy transferred from the Sun to the grass.
D Some of the energy transferred from the Sun, but none from the grass or the deer.
Answers
Answer: A
Explanation:
The sun will give energy to the grass, giving the ability to grow. The deer will then come along and eat the grass transferring some of that energy to the deer, giving it the energy to do it's daily activities, then the wolf will eat the deer, only transferring some of the energy to the wolf, because the deer had ahead used some of the energy and it came out as feces ect.
Separation of mixtures by removing a layer of liquid
Answers
Answer:
Decantation
Explanation:
Pls help me this is my last question
Answers
Answer: how much mass is in a certain amount of space
Explanation: density is g/mL; therefore it’s the mass (g) in a certain amount of space (mL)
Answer:
the answer would be how much mass is in a certain amount of space
Explanation:
H3PO4 → _H4P2O7+_H2O balance the equation
Answers
Answer:
2 H3PO4 = H4P2O7 + H2O
Explanation: