How many grams of hydrogen can be obtained by the reaction of 15 grams of aluminum
Plz help
A candle burning is an example of
A. an endothermic change
B. a physical change
C. energy being taken in
D. an exothermic change
Answer:
D
Explanation: An exothermic change is Because it has heat.
can someone help me please
Answer:
c
Explanation:its the ansr
3. What is found around the roots of some plants that turns nitrogen from the form we cannot use to the form we can use?
Answer:
Bacteria
Explanation:
Some plants, specifically leguminous plants form a symbiotic relationship with certain bacteria species called NITROGEN-FIXING BACTERIA in their root nodules. In this relationship, the bacteria species e.g nitrosomonas, nitrobacter etc help the plants fix atmospheric nitrogen (N2) or ammonium compounds, which are forms of nitrogen that are unusable to the plant into nitrates, a usable form.
Therefore, BACTERIA are the organisms found around the roots of these set of plants (legumes) that turns nitrogen from the form we cannot use to the form we can use.
can I please get help with it
Answer:
True
Explanation:
IT IS TRUE WIWJJWOWIWHW
1. How much energy (in KJ) is required to convert 50.0g of ice at – 30 ˚C to
steam at130˚C.
Answer:
How much heat energy required to convert following?
How much heat energy, in kilojoules, is required to convert 47.0 g of ice at -18.0 C to water at 25.0 C ?
Specific Heat of Ice - 2.09 j/g * c
This is how I did it and the answer is wrong...Please check and correct me
Q = m * Cice * Change in Temp
Q = (47.0 g)(2.09 J/g*c)(43) = 4222.6 J * 0.001 kj / j = 4.22 kj
Which Bohr diagram is drawn INCORRECTLY?
0 iv
O i
Oii
Pls helppp
Answer:
It is indeed c (II) because there can only be 2 electrons on the first layer
Explanation:
in the equation 3x-3=18 what is x?
Answer:
x=7
Explanation:
3x-3=18
-3 moves over the 18 side and becomes +3.
18 + 3 =21
3x=21
now you need to divide 3 with 21 giving you 7
Answer:
The answer is seven bc X is seven.
What are interactions between flip flops and sulfuric acid
Which of the following is an example of a chemical change?
a. freezing water to make ice.
b. a firework exploding.
c. breaking a glass bottle.
d. melting gold jewelry to make a gold bar.
Answer:
b. a firework exploding
Explanation:
3. Two substances, both liquids, start at the same temperature. You transfer
the same amount of energy out of both liquids, but substance 1 becomes a
solid before substance 2. Which substalice has a stronger molecular
attraction?
A Substance 1
B Substance 2
Pleas help I will give you Brainlyest
Answer:
Substance 1
Explanation:
Because if it becomes a solid BEFORE the other it means that the structure is more sound than the other substance. and if you add heat to something that becomes a solid it means it will come closer
I Hope this helps <3 and again i don't need the crown
difference between fluids and nonfluids
Answer:
All liquids are fluids but not all fluids are liquids. Fluids basically describe anything that can flow as a result of a difference in pressure between two points. Liquids on the other hand are a subset of fluids. Liquids are the incompressible fluids. These are the fluids who's density does not change sharply with pressure.
Gases are also fluids, they form the compressible fluids. They do flow as a result of difference in pressure between two points but at the same time they can be compressed or expanded. Their density fluctuates with pressure.
Hence fluids consist of 2 mutually exclusive groups of compressible and incompressible fluids. Liquids are the incompressible fluids and hence form a subset of the more general term fluid.
A student adds 3.00 g of dry ice (solid CO2) to an empty balloon. What will be the volume of the balloon at STP after all the dry ice sublimes (converts to gaseous CO2)?
How do coastal sand dunes form in Florida?
Answer:
They are formed by windblown sand collecting around an obstruction. As organic matter is deposited by wind and waves, low herbs colonize the dune. As these plants collect more sand and organic matter, the dune increases in height becoming the fore dune.
Which of the following are possible characteristics for the element this atom represents?
A.
Hard, can be flattened by a hammer
B
A non-reactive colorless gas
C.
Dull, non-conductor of heat and electricity
D
Shiny silver, can be coiled into a wire
Answer:
B
Explanation:
Sorry if i'm wrong
On the moon,When dropped from the same height Why does a flat sheet of paper fall more slowly than the same sheet when it is tightly crumpled into a ball?
Answer:
It all comes down to form. When the paper is smooth, it exposes a large surface to the air beneath it which slows its descent. Once it is crumpled, the surface which comes in contact with the air is much smaller, allowing it to fall much faster.
what are the products of cellular respiration?
Answer:
During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts. In cellular respiration, glucose and oxygen react to form ATP. Water and carbon dioxide are released as byproducts.
Explanation:
In cellular respiration,glucose and oxygen react to form ATP*. Water and Carbon dioxide are released as byproducts.The three stages of aerobic respiration are glycolysis , the krebs cycle , and oxidative phosphorylation.
ATP-Adenosine Triphosphite
the main energy currency of a cell
51 liters of helium and 29 liters of oxygen (O2), both at 35°C and 1.0
atmosphere, are pumped into a tank that has a volume of 5 liters. Calculate the number
of moles of each component and the total pressure in the tank at 35°C
Answer:
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, ... If I contain 3.0 moles of gas in a container with a volume of 60. liters and at a ... Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ... volume of 5.00 Lat 25.0C. Calculate the partial pressure of each gas and the ...
Explanation:
What is Newton's 1-3rd laws of motion? Give examples for each
Answer:
In the first law, an object will not change its motion unless a force acts on it
In the second law, the force on an object is equal to its mass times its acceleration
In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
Explanation:
Hope this helped :)
The Earth takes approximately 365.25 days to revolve around
the Sun. To account for the time beyond 365 days, we add a
day to the calendar
The Earth takes approximately 365.25 days to revolve around
the Sun. To account for the time beyond 365 days, we add a
day to the calendar
that's right
Simple conversions
You bought your pig and it weighed 82 pounds. By fair your goal weight is 267 pounds. Your pig will gain 1 pound for every 3 pounds of feed. How much feed will you need to get your pig to it's goal weight? (show your work) (5) Feed costs $21.37 per 50 pound bag. How much will your feed cost be, to get your pig to it's goal weight? (5) MUST SHOW ALL WORK.
Number of feed = 555 pounds
Feed cost = $237.21
Further explanationThe main composition of algebraic expressions are:
• 1. phrases/terms
• 2. variable
• 3. constants
• 4. arithmetic operations
• 5. coefficients
• 6. exponent
Initial weight = 82 pounds
Goal weight = 267 pounds
The difference in weight that must be achieved :
[tex]\tt 267-82=185~pounds[/tex]
The pig will gain 1 pound for every 3 pounds of feed⇒ 1 pound weight=3 pounds of feed
The amount of feed must be given:
[tex]\tt 185~pounds~weight\times 3~pounds~feed=555~pounds~of~feed[/tex]
Feed costs $21.37 per 50 pound bag, so for 555 pounds :
[tex]\tt (555~pounds\div 50)\times \$21.37=\$237.21[/tex]
Please help
As the temperature increases, the molecular motion of the molecules decreases and it
becomes difficult to overcome the polar attractions.
a. TRUE
b. FALSE
help help help plsss
Answer:
4.58×10^3
3.72×10^7
Explanation:
3.8×10^2 =380
+ 4.2×10^3=4200
= 4580 = 4.58×10^3
In science, all ideas are not tested with evidence from the natural world.
Question 4 options:
True
False
Answer:
i belive its trrue
Explanation:
Answer:
i think its false i hope this helps
Explanation:
What is the difference between the atomic weight and the relative
atomic mass (RAM)?
Answer:
Relative and average atomic mass both describe properties of an element related to its different isotopes. However, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.
Explanation:
What is responsible for the blue sky?
Answer:
The blue color of the sky is caused by the scattering of sunlight off the molecules of the atmosphere.
Explanation:
Answer:
sun shine
Explanation:
Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time
If chemical weathering occurs when minerals inside of the rock changes chemically. Will it change the rate of chemical weathering on a rock if it increase in rainfall amounts slow movement of a glacier, rapid growth of plant roots or decrease in air temperature?
Which of the following have the correct pairing of ion charge to the number of protons and electrons that would
deliver that charge for the ion written?
Select ALL that apply.
Select all that apply
А. 0-2: 8 protons and 4 electrons
B. Na+l: 11 protons and 10 electrons
С. N-3.7 protons and 10 electrons
D. Al 3. 13 protons and 16 electrons
Answer:
Explanation:
O-2 means that there are 2 more electrons than protons. This one is incorrect.
Na + 1 is correct. 11 protons and 10 electrons.
N-3 is correct 7 protons and 10 electrons.
AL+3 is incorrect. It goes the other way 13 protons 10 electrons.
the first question please!
When drawing a covalent lewis dot diagram its important to ensure that:
A each atom is surrounded by 6 electrons
B all symbols are in lower case letters
C all the elements have a charge in the top right side
D each atom is surrounded by 8 electrons