How many grams of hydrogen can be obtained by the reaction of 15 grams of aluminum
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)?
Which of the following is a pH for a base?
Question 4 options:
1
13
7
5
Answer:
is 7.................
Metal
Nickel
Silver
Lead
Mercury
Density (g/cm)
8.9
10.5
11.35
13.55
Mr. Keans's class is doing a lab to determine the identity of an unknown metal. Use the table to help determine
the identity of a metal that has a mass of 89 grams and occupies 10 cm of space.
O Nickel
O Silver
O Lead
O Mercury
Answer:
[tex]\boxed {\boxed {\sf A. \ Nickel}}[/tex]
Explanation:
First, we must find the density of the unknown metal.
Density is found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass of the metal is 89 grams and the density is 10 cubic centimeters.
[tex]m= 89 \ g \\d= 10 \ cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{89 \ g}{10 \ cm^3}[/tex]
Divide.
[tex]d= 8.9 \ g/cm^3[/tex]
Now we know the density and can identify the unknown metal.
Nickel: 8.9 g/cm³Silver: 10.5 g/cm³Lead: 11.35 g/cm³Mercury: 13.55 g/cm³The density matches nickel's density. Therefore, this metal must be nickel.
can I please get help with it
Answer:
True
Explanation:
IT IS TRUE WIWJJWOWIWHW
which best describes the relationship of substance particles in my neutral atom
Answer: The number of protons equals the number of electrons
Explanation:
The statement that describes the relationship of substance particles in my neutral atom is the number of protons equals the number of electrons. The correct option is C.
What are subatomic particles?Subatomic particles are the charged particles that are present inside the atoms. These particles are electron, proton, and neutron. The electron is negatively charged, a proton is positively charged and neutrons neutrally charges subatomic particle.
Neutron atoms are when there is no positive or negative charge present inside the atoms. This could happen when the negatively charged electron and positively charged proton combine, when negative and positive combines they become neutral.
Thus, the correct option is C. the number of protons equals the number of electrons.
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Your question is incomplete. Your most probably complete question is given below:
the number of electrons equals the number of megatrons
the number of neutrons equals the number of electrons
the number of protons equals the number of electrons
the number of protons equals the number of neutron
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:
In carbon dioxide, how many grams of oxygen would there be if there are 24
grams of carbon?
a 55 g
b 73 g
c 64 g
d 88 g
Answer:
c. 64 grams
Explanation:
What is the proper combining ratio (by mass) for carbon to oxygen in the reaction that forms carbon dioxide (CO 2)? From the data given in question 1, since 64 grams of oxygen reacts with 24 grams of carbon, the ratio must be 64 to 24, which is 2.7 parts oxygen to 1 part carbon.
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
When roasting marshmallows, is the marshmallow the system or the surrounding
the first question please!
What are the circles around the nucleus called
Answer:
Electron Shells
Outermost level: Valence level
Explanation:
The number of atoms of any element in the given chemical formula is the number that is written on the food of the symbol of that element. The circles around the nucleus called shells or orbits.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound. In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus in circular path called orbit or shells.
Thus the circles around the nucleus called shells or orbits.
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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 :)
what volume of water has a mass of 1 kg
Answer:
[tex]V=0.001\ m^3[/tex]
Explanation:
Mass, m = 1 kg
The density of water, d = 1000 kg/m³
We need to find the volume of water. The formula for the density of an object is equal to mass divided by volume. Its formula is :
d = m/V
V is the volume of water
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{1\ kg}{1000\ kg/m^3}\\\\=0.001\ m^3[/tex]
So, the volume of water is [tex]0.001\ m^3[/tex].
Answer:
Volume of water has a mass of 1 kg is explained below in details.
Explanation:
One liter of h2O has a volume of approximately specifically one kilogram when estimated at its maximum frequency, which happens at about 4 °C. It observes, therefore, that thousand of a liter, recognized as one milliliter (1 mL), of h2O has a volume of about 1 g; 1000 liters of h2O has a volume of about 1000 kg (1 tonne).
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.
Green plants convert light energy from the sun into what during photosynthesis
Answer: It turns the energy from the sun into a food for the plant.
I hope this helps, and Stay Safe! :)
it tuns the light into food
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
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]
A student wants to know what elements are present in the star sirus b.what instruments would he use
Answer:
Hydrogen and helium are the most abundant elements in a star.
Explanation:
True or False: If you find the percent by mass of all of the elements in a compound, it will always add up to exactly 100.00%
Answer: true
Explanation: because Mass percentage composition is found by calculating a fraction of the total mass by each element present in a compound. The whole compound itself would equal one or 100% in all the elements that make it up would only be a fraction, so it will always have to add up to 100%
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
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:
The terms concentrated and dilute are quantitative.
True
False
Answer:
true
Explanation:
cause thereare both in liquid form
Which substance is not produced during the electrolysis of concentrated aqueous sodium chloride?
A) Chlorine
B) Hydrogen
C) Sodium hydroxide
D) Sodium chloride
The substance is not produced during the electrolysis of concentrated aqueous sodium chloride is D) Sodium chloride
Which substance is produced for the duration of the electrolysis of concentrated aqueous sodium chloride?
while an electric current is handed via concentrated sodium chloride answer, hydrogen gasoline bureaucracy at the negative electrode, chlorine gas bureaucracy at the fantastic electrode, and an answer of sodium hydroxide also form.
What occurs whilst the concentrated answer of sodium chloride is electrolyzed?(a) when a concentrated solution of sodium chloride (brine) is electrolyzed, it gets decomposed. this is a decomposition reaction. the products of this reaction are sodium hydroxide, chlorine, and hydrogen.
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Which element, represented by X, reacts with oxygen to produce the compound X2O?
Aluminum
Calcium
Argon
Lithium
Answer:
lithium
Explanation:
this is because lithium has a valency of 1 and oxygen has a valency of 2 thereby exchanging valency to create Li²0
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.
What are interactions between flip flops and sulfuric acid
How many grams of carbon are in 300 g of glucose
Darryl finds a bottle of what looks like clear water, with dirt settled at the bottom. When he shakes the bottle, the water gets dirty. Which term best describes the matter in the bottle?
A.homogeneous mixture
B.heterogeneous mixture
C.element
D.compound
Answer:
The correct answer is Heterogeneous mixture
Explanation:
Heterogeneous mixture are those mixture in which:
Substance is distributed in non uniform manner.
Two distinct layers are formed
Thus when water and dirt are mixed together it results in the formation of a heterogeneous mixture and after sometimes two different layers will be observed.
Hence, in the bottle there is a heterogeneous mixture of water and dirt.
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