Answer:
3 DIFFERENT ELEMENTS
Explanation:
H - Hydrogen
S- Sulfur
O- Oxygen
Therefore there are 3 elements
What is the molality of the solute in a 25. 5 percent by mass aqueous solution of formic acid (hcooh)?
Molality is the ratio of the moles of the solute and the mass of the solvent. The molality of the solute is 7.38 m.
What is molality?Molality is the moles of the solute present in a kilogram of the solvent in a solution of the substance.
Given,
Percent by mass = 25.5 %
In 100 gm of solution = 25.5 gm of formic acid
Mass of solution = 100 gm
Mass of solute = 25.5 gm
Mass of solvent = 74.5 gm
Moles of solute are calculated as:
[tex]\dfrac{25.5}{46} = 0.55 \;\rm moles[/tex]
Moles of solvent are calculated as:
[tex]\dfrac{74.5}{18} = 4.13\;\rm moles[/tex]
Molality is calculated as:
[tex]\begin{aligned} \rm Molality &= \rm \dfrac{moles}{\text{mass in kg}}\\\\&= \dfrac{0.55}{0.0745}\\\\&= 7.38 \;\rm m\end{aligned}[/tex]
Therefore, 7.38 m is the molality of the solute.
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Which is characteristic of an exothermic reaction?
A. Material absorbs heat from its surroundings. B. Molecules in a material become more orderly.
C. Molecules in a material become less orderly. D. Material releases heat to its surroundings.
Answer:
D. Material releases heat to its surroundings.
Explanation:
use the ex in exothermic to remember the word
exit
as in
heat is exiting the material
khan academy
8. A sample of CO2 experiences a change in pressure from 239.18 kPa to 442.6 kPa. During
this change, the temperature is also changed from 267.86 K to 399.29 *C. If its new volume is
7680.5 mL, what was its original volume in liters?
Answer:
v1=35,679.7 ml
Explanation:
p1v1/t1=p2v2/t2
v1=t1p2v2/p1t2
v1=672.44*442.6*7650ml/267.86*239.18
v1=35,679.7 ml
Elements in Group IIA (also known as Group 2, or the alkaline earth metals) have similar properties because they all have the same number of ____
(multiple choice)
A. valence electrons
B. electrons
C. electrons needed to fill their octet
D. electron shells
Answer:
Electrons in their outer shell
Explanation:
They have similar properties they have the same number of electrons in their outermost shell.
Help pls chemistry stuff?
Answer:
saturated is the correct one
Answer: saturated
Explanation:
When a solution contains the maximum amount of solute that can dissolve under a given set of conditions, it is a saturated solution. Any more solute added will sit as crystals on the bottom of the container.
If the specific heat of a material is 0.416 J/(g°C) and sample absorbs 50 J when it is heated from 30°C to 50°C what is the mass of the sample?
The mass of the sample of the material is 0.1664 g.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula of specific heat
[tex]Q = mc \Delta T[/tex]
Given, that the specific heat (c) of material is 0.416 J/gC
The difference in temperatures is 30°C to 50°C
The mass=?
Q = heat, 50 J
Putting the values in the equation
[tex]\rm 50\;J = m \times 0.416 J/g^\circ C \times (50 - 30)\\\\m = \dfrac{0.416 J/g^\circ C \times 20}{50} = 0.1664 g[/tex]
Thus, the mass of the samples is 0.166 g.
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Is the chemical equation balanced?
Yes or no
Answer:
Yes the equation is balanced
Explanation:
There is 2Na and 2F on both sides which means LHS=RHS. Hence,its balanced.
Rank these solutions from the most alkaline (1) to the least alkaline (5). POH = 0. 5 pH = 3. 5 [OH–] = 5. 62 × 10–5 M [H3O ] = 3. 16 × 10–7 M pH = 0. 5.
Answer:
1 4 2 3 5 from top to bottom
Explanation:
1 - pOH = 0.5
4- pH = 3.5
2- [OH–] = 5.62 × 10–5 M
3- [H3O+] = 3.16 × 10–7 M
5- pH = 0.5
Select the correct answer.
in a grassland, the number of antelopes increased from 200 to 400. Antelopes are grass-eating animals. How will this change directly affect the
ecosystem?
O A. There will be fewer producers in the area.
• B. There will be an increase of other grass-eating animals.
O C. There will be no decomposers in the area.
O D. There will be fewer predators in the area.
Answer: A. There will be fewer producers in that area.
Explanation: Answer A is correct because all plants, including grass, is a producer. Since there is an increase in grass eating animals (Antelope), more grass will be consumed, decreasing the amount of grass aka producer.
A sample of carbon dioxide gas occupies a volume of 2.50 l at 140 kpa. what pressure would the gas exert if the volume was decreased to 1.25 l?
Answer:
280 kPa
Explanation:
P1V1 = P2V2
140 * 2.5 = P2 * 1.25
P2 = 280 kPa
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: ca2 , cr4 , cl−, s2−
The empirical formula of at least four binary ionic compounds that could be formed from the calcium, chromium, chloride and sulfide ions are CaCl₂, CrCl₄, NaCl and CaS respectively.
What are binary ionic compounds?If any compound which is composed of two different elements, one of which is a positive ion (metal), and the other is negative ion (non-metal) is called binary ionic compounds.
Binary ionic compound of Ca²⁺ is CaCl₂.Binary ionic compound of Cr⁴⁺ is CrCl₄.Binary ionic compound of Cl⁻ is NaCl.Binary ionic compound of S²⁻ is CaS.Hence, CaCl₂, CrCl₄, NaCl and CaS are the four binary ionic compounds.
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What is the initial temperature of a gas if the volume changed from 1. 00 l to 1. 10 l and the final temperature was determined to be 255. 0°c?
Answer:
206.99 C
Explanation:
V1 / T1 = V2 / T2 T must be in K units
V1 * T2/V2 = T1
255 C = 528.15 K
(1)(528.15)/1.1 = T1 = 480.14 K = 206.99 C
Question 15 of 35
A bog formed where there was once a pond.
Which three statements describe how the pond turned into the bog?
A. The pond started to fill with soil, but the soil could still hold
standing water.
O B. Large water plants grew in shallow water around the edge of the
pond.
O C. Land plants grew on dry soil that had completely filled the pond
Please explain
The statements that describe how the pond turned into the bog is as follows: Large water plants grew in shallow water around the edge of the pond.
What is a pond?Pond is an inland body of standing water, either natural or man-made, that is smaller than a lake.
A bog is an area of decayed vegetation (particularly sphagnum moss) which forms a wet spongy ground too soft for walking.
This means that a pond can become a bog when existing plants in the pond decays until the land becomes soft.
Therefore, the statements that describe how the pond turned into the bog is as follows: Large water plants grew in shallow water around the edge of the pond.
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What do blizzards consist of? (Select all that apply)
Question 1 options:
heavy snowfall
high winds
hail
extremely low temperatures
Answer:
Heavy Snowfall
High Winds
Extremely Low Temperatures
Reasoning:
Lots of snow, kinda self explanatory
high winds are needed to carry the snow that fast
its has to be below freezing for snow to even form
2 C4H10 + 13 O2--> 8 CO2 + 10 H2O
How many molecules of CO2 are produced from the combustion of 100 grams of butane (C4H10)?
Answer:
4.14 x 10²⁴ molecules CO₂
Explanation:
2 C₄H₁₀ + 13 O₂ --> 8 CO₂ + 10 H₂O
To find the number of CO₂ molecules, you need to start with 100 grams of butane (C₄H₁₀), convert to moles (using the molar mass), convert to moles of CO₂ (using coefficients from equation), then convert to molecules (using Avagadro's number). The molar mass of C₄H₁₀ is calculated using the quantity of each element (subscript) multiplied by the number on the periodic table. The ratios should be arranged in a way that allows for units to be cancelled.
4(12.011g/mol) + 10(1.008 g/mol) = 58.124 g/mol C₄H₁₀
100 grams C₄H₁₀ 1 mol C₄H₁₀ 8 mol CO₂
-------------------------- x ---------------------- x ---------------------
58.124 g 2 mol C₄H₁₀
6.022 x 10²³ molecules
x ------------------------------------ = 4.14 x 10²⁴ molecules CO₂
1 mol CO₂
when an acid mixes with a bases it is called a combination reaction?
true
false
Please help me with this
Class 7
Answer:
a . Organ A is heart liquid B is blood
b. red is the colour of liquid B
c. the useful substance is oxygen and nutrients
d. carbon dioxide is the waste E
how much energy is produced when CO2 is formed if each C-O bond releases 350 kJ?
Answer:
700 kJ
Explanation:
There are two C-O bonds in CO2
2 * 350 = 700
Which of the following is not true about elements? 1. Elements are made of atoms of the same type. 2. Each element has a unique set of physical and chemical properties. 3. Elements cannot be broken down into a simpler set of properties. 4 Elements are the building block of matter.
Sorry If This Is Late***
Elements can't be broken down, into a simplre set of properties. They are one strict unit & cannot be broken down, however they can be added together to make a compound.
HOPE THIS HELPS & good luck <3 !!!!!
How many moles are equal to 8.44 x 1023 atoms of sulfur?
Round your answer to three decimal places.
Hurry please.
Answer:moles or atom. The SI base unit for amount of substance is the mole. 1 mole is equal to 6.0221415E+23 atom. Note that rounding errors may occur, so always check the results.
Explanation:
Lab: Half-Life Claim, Evidence, Reasoning: Lab Prompt Write 3 total sentences establishing your claim, giving your evidence from the lab, and giving your reasoning. Using the data collected from your lab, and the objective questions, create a CLAIM: based on evidence collected in the lab EVIDENCE: Pulled directly from the lab REASONING: Based on principles, rules, universal laws, definitions.
The question is not found here but the results of a lab experiment can be used to draw discussions and conclusions.
What is an experimental procedure?An experimental procedure in the lab refers to the process to validate (or reject) our working hypothesis from a given question of the natural world.
Within the laboratory, we need to collect data through experimental procedures that help us as evidence to answer the hypothesis.
In conclusion, the question is not found but the results of a lab experiment can be used to draw discussions and conclusions.
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What is the lowest temperature in Kelvin (to the nearest thousandth) that would cause a red blood cell within the human body experience apoptosis?
The lowest temperature that would cause a red blood cell within the human body experience apoptosis is 338K.
What is aposptosis?Aposptosis is the death of cells in the am organisms which occur as a result of death in cellular processes or steps resulting in the death of a cells could be as a result of high temperature.
Therefore, The lowest temperature that would cause a red blood cell within the human body experience apoptosis is 338K.
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What is defined as the energy required to start a chemical reaction?
O precipitate energy
O reactant energy
O activation energy
O heat
[tex]\huge\tt\fbox\pink{Activation \: energy}[/tex]
STAY SAFE, STAY HEALTHY AND BLESSEDHAVE A MARVELOUS DAYTHANK YOU& GOOD LUCK FOR UR ASSIGNMENT♡#JENNIFER♡________________________________Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu.
A solid
has
a definite volume and
has
a definite shape.
A liquid
has
a definite volume and
does not have
a definite shape.
A gas
has
a definite volume and
does not have
a definite shape.
Answer:
Explanation:
Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu.
Answer:
I got it right
Explanation:
Can someone help me with this problem.
Answer:
c. a small amount
Explanation:
Trace elements (or trace metals) are minerals present in living tissues in small amounts.
Why do rocks on the ocean floor form a pattern of magnetized stripes? hurry hurry pls pls pls HURRY
Answer:
BEST ANSWER :The rocks contain iron that points in the direction the rocks move away from the ridge.
Hydrogen gas is collected over water at a total pressure of 95.0kPa. The volume of gas collected is 28.0mL at 25.0˚C. Determine the partial pressure of the hydrogen gas if the water vapor pressure is 3.17kPa.
GAS LAW:
Given:
Unknown:
Formula:
Solution:
Dalton's Law
P tot = P H₂O + P gas
95.0 = 3.17 + P gas
P gas = 91.83 kPa
Mg(s) + 2 HCl (aq) _MGCL2 (Aq) + H2 (g) the total pressure of gas collected over water is 740.0 mmhg and the temperature is 21.5 ‘c what is the pressures of hydrogen gas formed in mmhg?
The pressure of hydrogen gas formed is 720.8 mmHg.
What is Partial Pressure ?The pressure exerted by a (specified) component in a mixture of gases.
We have to understand one thing that the Hydrogen, which is collected over water, will be mixed with water vapor.
This means that the total pressure of the mixture will have two components.
the partial pressure of Hydrogenthe vapor pressure of water at 21.5 CThe vapor pressure of water at that temperature is approximately
19.231 mmHg.
This means that
[tex]\rm P_{total} = P_{hydrogen} + \; P_{water vapor}[/tex]
740 = [tex]\rm P_{hydrogen}[/tex] + 19.231
[tex]\rm P_{hydrogen}[/tex] = 740-19.231
[tex]\rm P_{hydrogen}[/tex] = 720.8 mmHg
Therefore the pressure of hydrogen gas formed is 720.8 mmHg.
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In rabbits, short fur (f) is dominant to long fur (1). what is the probability of two heterozygous rabbits having offspring with short fur?
25%
50%
75%
100%
50%
Because f is dominant to 1, it will be a 50/50 chance of the offspring having short fur, or long fur.
Pls correct me if im wrong
Explain the impact that changing concentrations has on a system in a state of dynamic equilibrium. What will happen when reactants are added to a reversible reaction mixture at equilibrium?
if pressure is increased, equilibrium will shift toward the side that has the last amount of moles in order to alleviate the sudden change and bring the pressure back down.