Answer:
54.4g
Explanation:
Let's first take account of what we have and what we're looking for.
Q = heat energy (Joules, J)= 490 J
m = mass of a substance= ??
c = specific heat (units J/kg∙K)= 0.50 J/g°C
∆T = change in temperature (Kelvins, K)= Final temperature - initial temperature -> (0C - (-18C))
We can use Q = mc∆T to determine the mass, we'll rearrange the formula to solve for mass, so it'll be: m=Q/c∆T. Let's plug it all in.
m= 490J / (0.50 J/g°C x ((0C - (-18C)))
m= 490J / (0.50 J/g°C x (0 + 18))
m= 490J / (0.50 J/g°C x 18)
m= 490J / 9 J/g
m= 54.4g of glass
Which of the following equations is balanced?
2H2 + O2 + 4H20
4Na + O2 - 2Na20
Fe2O3 + H2 - 2Fe + 3H20
CH4 + O2 - CO2 + H20
Answer:
4Na + O2 - 2Na20Is the balanced equations .
What type of reaction is this?
Answer:
Decomposition
Convert 230 centimeters into yards
It would be 2.515 yards. This is because to convert cm into yards, you would need to divide the length value by 91.44 so in your case, it would be 230÷ 91.44 which equals 2.51531.
Hope that helps!
An unknown gas has pressure, volume and temperature of 0.9 atm 8L and 120°C respectively. How many moles of gas are present?
Answer:
n = 0.223 mol.
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to approach this problem via the ideal gas law, which involves the pressure, moles, temperature and volume of the gas:
[tex]PV=nRT\\\\[/tex]
Thus, by solving for moles we obtain:
[tex]n=\frac{PV}{RT}[/tex]
Therefore, we plug in the given volume, temperature (in Kelvins) and pressure to obtain:
[tex]n=\frac{0.9atm*8L}{0.08206\frac{atm*L}{mol*K}*(120+273)K} \\\\n=0.223mol[/tex]
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4. How many moles of Ca(HCO3)2 are present in 4.6 liters of a 3.5 molarity
solution?
Predict the reactivity of beryllium compared with magnesium give a reason for your answer use the periodic table
Answer:
Beryllium metal is relatively unreactive at room temperature, particularly in its massive form. Magnesium is more electropositive than the amphoteric beryllium and reacts more readily with most of the nonmetals.
Explanation:
When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.
What is magnesium ?The chemical element magnesium has the atomic number 12 and the letter Mg as its symbol. It is a glossy, gray metal with a low melting point, high chemical reactivity, and a low density. It only naturally occurs in mixtures with other elements, just like the other alkaline earth metals, and it almost always has an oxidation state of +2.
At room temperature, beryllium metal is largely non-reactive, especially in its massive form. Magnesium interacts more quickly with the majority of nonmetals because it is more electropositive than amphoteric beryllium.
Due to the electron being removed being in the 3-level rather than the 2-level and being further away from the nucleus's attraction, the first ionization energy of magnesium is lower than that of beryllium.
Thus, When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.
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Question #1: Identify the type of Mutation below
Original
TTCGATA
TTGATA
Copy
Insertion
Substitution
Deletion
Answer:
Deletion
Explanation:
A mutation refers to a change in the DNA sequence. This means that the original sequence of bases in the DNA has been altered permanently.
There are three types of DNA mutations; base substitutions, deletions and insertions.
In the particular case of this question, the original is TTCGATA while the copy is TTGATA. If you look closely at the two, you will notice that the C has been omitted. This is an example of deletion.
What is the [OH-] in a solution that has a pH = 9.23? *
O 1.7x10^5
O 8.2x10^-9
1.7x10^--5 M.
Answer: 1.7x10^-5
Explanation:
pH + pOH = 14
14 - pH = pOH
14 - 9.23 = 4.77
pOH =4.77
[OH-] = 10^-pOH
= 10^-4.77
= 1.698243x10^-5
= 1.7x10^-5
What is the relationship between density and speed of light?
Answer:
The more optically dense that a material is, the slower that a wave will move through the material. ... So as the index of refraction value increases, the optical density increases, and the speed of light in that material decreases.
Write a sentence or mathematical expression that relates each of the
following:
-mass to moles
-moles to mass
-moles to particles
-particles to moles
Answer:
Mass to moles: mass/molar mass=mole
Moles to mass: moles x molar mass = mass
Moles to particles:1mole = 6.022x10^23 particles
Particles to moles: 1 particle =1/(6.022x10^23) mole
Explanation:
(b) Why is nitrogen used for storage of semen
in artificial insemination?
The pen on seismograph swings freely.
At 390 K, the pressure of a sample of nitrogen is 2.07 atm. What will the
pressure be at 480 K
Answer:
190k 100 on the test
Explanation:
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?
A single proton has the charge of +1.
A neutron is neutral and has a charge of 0
A single electron has the charge of -1
Since the nucleus contains both protons and neutrons, with neutrons have charge of 0 and protons with +1, the total charge of the nucleus would be 25 * 1 which is +25.
Answer:
25+
Explanation:
25+ = the number of protons in the nucleus
2Fe2O3 + C → Fe + 3CO2 You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?
PLEASE HELP ASAP!! 100 PTS!!
Match the environmental stresses to what would happen in the chemical reaction. Think through the path from the carbon cycle - how CO2 is removed from the atmosphere and stored in sinks and then how CO2 is released from sinks and/or produced.
(Picture attached)
Answer:
coz would be equal so you would need co3 instead
Explanation:
Answer:
Explanation:
1. Shift towards products
- Decrease in no. of cars
- Decrease in no. of farms
2. Shift towards reactants
- Decrease in shellfish
- Loss of trees
- Increase in earth's temperature
this refers to the speed of an object at a specific moment in time
Answer:
Instantaneous speed is the speed of an object at a specific moment in time
What is the molarity of a solution which contains 0.80 mol of HCl in 250mL of
solution?
Answer:
3.2M HCl Solution
Explanation:
Molarity = moles of solute / volume of solution expressed in liters
moles of solute = 0.80 moles HCl
volume of solution = 250 ml = 0.250 Liter
Molarity (M) = 0.80 moles HCl / 0.250 Liters = 3.2M HCl Solution
When are atoms considered stable?
when they have satisfied the law of conservation of mass naturally or through bonding to obtain
full valence shells
when they have satisfied the octet rule naturally or through bonding to obtain full valence shells
when their valence electrons have "fallen" back to ground state through bonding
Answer:
when they have satisfied the octet rule naturally or through bonding to obtain full valence shells
Explanation:
Generally, most atoms of an element are unstable because they have a void in their electron shell to fill, hence, they need to react with other elements to fulfil this task of octet.
Octet rule states that atoms of elements engage in reactions to form compounds so they can have eight (8) valence electrons in their shell. Noble gases e.g argon, neon etc. are elements that have naturally satisfied this octet rule by possession of 8 valence electrons in their shell. Other elements that do not have this naturally becomes reactive and enter bonding with other atoms to obtain full valence shells.
For the reaction 2Na + 2H20 - 2NaOH + H2, what type of reaction is taking place?
O synthesis
O decomposition
O single replacement
O double replacement
is part of the digestive and the respiratory system because food and air can travel 3. The through it.
OLungs
O Heart
O Pharynx
O Diaphragm
Help me!!!
Answer:
pharynx
Explanation:
How is ice cream made???? Hurry plsss!!!
Answer:
Milk, cream, milk solids, sugars, modifying agents and flavourings are blended together in stainless steel vats.
The mix is homogenised to create a consistent texture.
The mix is pasteurised by heating at 82-85°C for 15 seconds then cooled to destroy bacteria.
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Students investigating chemical reactions conducted the experiment you see here. An antacid tablet was dropped into a plastic bag containing 10 ml distilled water at 22oC. The bag was immediately zipped closed and the chemical reaction proceeded until completion. Based on your knowledge of chemical reactions, choose all of the statements below would apply?
A) the tablet completely disappeared.
B) The total mass at the completion of the experiment is 16.72g.
C) The mass of the products is slightly less than the mass of the reactants.
D) A decrease in the mass of the products in the result of the production of a gas.
E) Evidence of a chemical reaction includes the production of something new: a gas
Answer: B and E
Explanation:
The chemical reactions are all around us. Here for the given reaction the tablet completely disappeared and evidence of a chemical reaction includes the production of something new: a gas. The correct options are A and E.
A chemical reaction is defined as the reaction in which the bonds are broken within the reactant molecules and the new bonds are formed within the product molecules. In a chemical reaction the compounds interact to form new substances called products.
In a chemical reaction, a chemical change must occur which is generally observed with precipitation, heat formation, etc.
Thus the correct statements are options A and E.
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Cheryl kept a potted plant near a window. After two days, she observed that the plant had drooped as shown.
What would most likely help the plant to become healthy
PLEASE HELP!!!!!!!!!!!!!!!!!!! You will recieve 25 points if you help me.
A. watering the plant
B. adding more soil to the pot
C. replanting the plant in a larger pot
D. providing more sunlight to the plant
47.9 ml hrdrogen is collected at 26° Celsius and 718 torr. Find the volume occupied at STP
Answer:
The volume at STP is 41.3mL
Explanation:
To solve this question we must find the volume using the combined gas law. The equation is:
P1V1 / T1 = P2V2 / T2
Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of the gas.
P1 = 718torr
V1 = 47.9mL
T1 = 26°C + 273.15 = 299.15K
P2 = 760torr at STP
V2 = ?
T2 = 273.15K at STP
Replacing:
718torr*47.9mL / 299.15K = 760torr*V2 / 273.15K
41.3mL = V2
The volume at STP is 41.3mL
Why are detergents bad for the environment?
Answer: They are pollutants when they encourage bacterial growth and loss of oxygen in our rivers and streams, they can be the cause of a very unhealthy ecosystem :( kinda sucks tbh
Explanation:
How do you make crack and what are its effects?
Examine the model of a metallic bond.
What do the smaller circles represent?
o the cations held in place by the attractive forces within the sea of electrons
O the delocalized electrons that are free to move around the positive cations
the distinct and rigid bond between the different metal atoms
the unshared pairs of electrons of the metal atoms involved in the metallic bond
Answer:
b the delocalized
Explanation:
it could be the right answer
It was believed that Earth was a stationary object at the center of the universe. All other objects in space were thought
to go around Earth. Which of these is a criticism of this idea?
A)
Years on Earth are regular periods of three hundred sixty five days each
B)
Earth's shadow falling on the moon shows that Earth is actually spherical,
rather than flat
The moon goes around Earth, resulting in different phases of the moon
that can be seen from Earth
D
There are four seasons on Earth only because Earth is tilted at its axis and
it goes around the sun
Answer: A) years on Earth are regular periods of three hundred sixty five days each
The criticism of the given idea is that there are four seasons on Earth only because Earth is tilted at its axis and it goes around the sun.
What are seasons?A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's tilted orbit around the Sun. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to undergo hibernation or to migrate, and plants to be dormant.
The Northern Hemisphere experiences most direct sunlight during May, June, and July, as the hemisphere faces the Sun. The same is true of the Southern Hemisphere in November, December, and January. It is Earth's axial tilt that causes the Sun to be higher in the sky during the summer months, which increases the solar flux.
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Please help, due soon!
Different stimuli create various reactions in our bodies. Name the three types of stimuli. For two of these, give an example.
Answer:
three types of stimuli consists of
Mechanical,
thermal,
and chemical.
Explanation:
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