Answer:
Molarity = 1.5 M
Explanation:
Given data:
Molarity of solution = ?
Number of moles of NaCl = 0.30 mol
Volume of water = 200 mL (200/1000 = 0.2 L)
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Molarity = 0.30 mol / 0.2 L
Molarity = 1.5 M
Which element is most likely to have an oxidation number of +2?
O sodium (Na)
O magnesium (Mg)
O chlorine (CI)
O argon (Ar)
The answer is magnesium (Mg).
does the mean molecular speed chnage as much as the temperature as the water heats up? explain please help
Explanation:
When water is heated up then its molecules move rapidly from one place to another. Hence, kinetic energy of the molecules tend to increase.
Also, K.E = [tex]\frac{3}{2}kT[/tex]
where, T = temperature
Therefore, more is the increase in temperature more will be the mean molecular speed change in the water molecules.
As a result, mean molecular speed change increases with increase in temperature and vice-versa.
Jillis climbing
Where does she need
high friction?
Answer:
The further away the centre of mass is from the wall, the more friction force is required at the hands. The more weight is shifted from the hands to the feet, the smaller is the friction force at the hands and the closer is the climber to the point of impending slippage.
In gymnastics, a gymnast must be able to balance on a balance beam. What is the best explanation for what forces are acting on the gymnast on a balance beam?
Explanation:
When the gymnast is standing straight up, gravity acts on the gymnast but the gymnast is able to stay relatively stable.Tihis happens because her center of mass is directly above the beam which means that gravity is pushing her down onto the beam.
Which element is considered to be a transition element?
F
Sn
Cu
Na
Answer:
Cu
Explanation:
From the given choices only Copper is considered a transition element.
Transition elements are found between the groups IIIB - IIB on the periodic table.
These elements are also said to be d-block elements.
Copper is the 29th element on the periodic table of elementsIt belongs to the first row of the transition elements. Fluorine is in the p-block and a member of the halogenTin is the 5th groupNa is an alkali - metalWhat is the mass of 0.572 moles of Al?
DESPERATE WILL GIVE BRAINLIST AND THANKS
Mitosis is involved with growth while meiosis is involved with reproduction.
True
False
1. Which piece of laboratory glassware is used to make precise
concentrations of solutions?
A. volumetric flask
B. beaker
C. buret
D. test tubes
Answer: I beleive it is the volumetric flask.
Explanation:
I searched it up.
PLEASE I WILL RATE YOU AND I DONT HAVE TIME PLEASEEE The volume of a substance is 20cm³ and its mass is 80 gm. Will this substance sink or float in water. Explain the reason showing calculation.
Answer:
80g=0.08kg
20cm=0.02m
density=m/v
= 0.08/0.02
=4kg/m^3
it is less than density of water so it floats
Which evidence suggests that tulip populations may be affected by a warming climate?
A. Tulips are being pollinated by bees.
B. Tulips begin to flower at an earlier date than average.
C. Tulips grow larger than normal with more attractive flowers.
D. Tulips produce leaves, flowers, stems, and roots systems to grow.
Look at the questions labelled A, B, C, D. A How many substances are there in drinking water? B How much fluoride is in drinking water? C Is fluoride soluble in drinking water? D Should fluoride be added to drinking water? Which one of the questions cannot be answered by science alone? Tick one box.
Answer:
Magnesium, calcium and sodium.
Explanation:
Magnesium, calcium, sodium, and other beneficial minerals are the substances present in drinking water. Different regions have different fluoride concentration in their water such as in sea water, fluoride level is 1.1 mg/L while in surface water, the concentration is 0.01–0.3 ppm. Yes, fluoride is soluble in water. No, fluoride should not be added to drinking water because it harm for health. All the questions can be answered by science because it is related to chemistry.
Question 1
Which statement about human activity and the environment is NOT true?
Humans knowingly create environmental disasters.
Humans affect ecosystems in many ways.
e
Humans can create solutions to disasters.
o
Humans have altered ecosystems for a long time.
The statement about human activity and the environment that is NOT true is:
A. Humans knowingly create environmental disasters.
Environmental disaster:An environmental disaster is usually understood as an irreversible change in the natural complex, which can lead to the death of living beings. It states that these can be even the smallest species of organisms.
Examples of environmental disasters include wildfires, landslides, floods, earthquakes, droughts, tornadoes, tsunamis, and volcanic eruptions.
Thus, option A is correct.
Find more information about environmental disasters here:
brainly.com/question/26342911
The portion of Earth underneath the crust containing the asthenosphere and the mesosphere is the
Answer:
lithosphere
Explanation:
Answer:
mantle
Explanation:
why is the electronic stucture written as 1s 2s 2p 3s 3p 4s. ... ?
Answer:
Because of the orbital states. In one S your able to add one elecrron and so on.Help please How much water do you think the average household in the US uses every day?
Answer:
About 140 gallons?
Explanation:
what is the driving force for the movement of earths plates?
What are the 3 primary states of matter?
Answer:
solid liquid gas
Explanation:
solid liquid gas
what does a negative cell voltage mean?
A. the reaction releases energy
B. the reaction is non-spontaneous
C. the reaction can never happen
D. the reaction is spontaneous
Answer:
I think its B but i may be wrong
Explanation:
Sorry if im wrong!! Took that test but i dont rm the answer well enough to be for sure
The reaction is non-spontaneous
this is the correct answer
In every chemical reaction that produce energy, ____ react with ________ ?
Answer:
Acid reacts with water?
Explanation:
Which is an empirical formula?
1 P2O5
2 P4O6
3 C2H4
4 C3H6
P₂O₅ is an empirical formula
Further explanationGiven
compounds
Required
an empirical formula
Solution
The empirical formula is the smallest comparison of the atoms forming the compound.
Molecular formulas are formulas that show the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
1. P₂O₅ : the ratio of compounds cannot be further reduced to whole numbers⇒empirical formula
2. P₄O₆ : molecular formula
(P₂O₃)₂=P₄O₆
P₂O₃ : empirical formula
3.C₂H₄ : molecular formula
(CH₂)₂=C₂H₄
CH₂ : empirical formula
4. C₃H₆ : molecular formula
(CH₂)₃=C₃H₆
CH₂ : empirical formula
Answer:
P₂O₅
Explanation:
Balance the equation below:
Fe+CuSO4
[Fe+CuSO4 = FeSO4+Cu is not the correct answer]
Answer:
Fe+CuSO4 ⇒ FeCu+SO4
Answer:
Fe + CuSO4 = Fe2 (SO4)3 + Cu - Chemical Equation Balancer
Explanation:
To balance Fe + CuSO4 = Cu + FeSO4 you'll need to be sure to count all of atoms on each side of the chemical equation. When we balance equations with polyatomic ions, like SO4 2- it is helpful to consider the SO4 as one item as long as there is a SO4 on both sides of the chemical equation.
Once you know how many of each type of atom you have you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation.
Important tips for balancing chemical equations like Cu + FeSO4 | Iron and Copper(II) Sulfate:
- Only change the numbers in front of compounds (the coefficients).
- Never change the numbers after atoms (the subscripts).
- The number of each atom on both sides of the equation must be the same for the equation to be balanced.
Identify each of the following compounds as binary or ternary.
a. nickel (III) oxide
b. copper(II) iodide
c. tin(IV) nitride
d. chromium (II) bromide
e. iron (III) phosphide
f. lithium hydroxide
g. Potassium sulfate
h. Ammonium phosphide
i. Barium nitrate
j. cobalt (II) phosphate
Answer:
binary compounds have 2 different elements, and ternary compounds have 3
Nickel(III)oxide: binary, Ni2O3
Copper (II)iodide: binary, CuI2
Tin(IV) nitride: binary, Sn3N4
Chromium (II)bromide: binary, CrBr2
Iron(III)phosphide: binary, FeP
Explanation:
earth science includes the study of air , water and land
true or false
Answer: ITSSSS TRUE!!!!!
Explanation:
How many grams are in .705 moles of Cr?
Answer:
51.9961 grams
Explanation:
Just did worksheet
please help last assignment of the day
In this qn, you use the mole formula,
amount (mol) = mass (g) ÷ molar mass
(molar mass is the mass number of an element, which u can find by referring to the periodic table)
so by subbing in the values given to you, you can find the answer
5. amount of Cu = 55.9 ÷ 63.5 = 0.880mol (3sf)
6. amount of N2 = 340 ÷ 2(14.0) = 12.1mol (3sf)
(note: you multiply the molar mass of N by 2 as there are 2 N atoms)
for qn 7 and 8, youre finding the mass and not the amount. By bringing the molar mass over to the other side of the formula, you get
mass = amount (mol) × molar mass
thus,
7. mass of Fe = 0.063 × 55.8 = 3.52g (3sf)
8. mass of H2 = 94.7 × 2(1.0) = 47.4g (3sf)
extra things to take note of:
- likewise, you can also find the molar mass of an element by using
molar mass = mass(g) ÷ amount(mol)
^^ this is commonly only needed when you need to find the molar mass of an isotope. the question will give you the amount and mass of the element, and you just need to factor them in to find your answer.
- typically, you use 3 sf in your final answer and 5sf in your working. remember to write (3sf) at the end of your number statement when necessary.
- when you get an answer of (eg.) 0.6mol, you still need to write it in 3sf, so your answer would be 0.600mol
Define chemical reaction
Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
hope this helps ^^
How many kilocalories of heat are released when 75 g of steam at 100 degrees Celsius is converted to ice at 0 degrees Celsius?
Answer:
∴ Q = -7.52kCal
Explanation:
Using the formula for specific heat capacity:
Q = mcΔT
where ΔT = change in temperature (final - initial) = (0 - 100)°C = -100°C
m = mass (g) = 75g
c = specific heat capacity = 4.2 J/g°C in water
⇒ Q = 75 × 4.2 × -100
= -31,500J
But 1J - 0.000239kCal
∴ Q = -7.52kCal
Let me know if I can be of further assistance.
UNDERSTANDING CONCEPTS-Fill in the Blanks:
Periodic Trends: Write either INCREASE or DECREASE or VARIABLE:
17.lon size = Atom → Cation
18. Atomic radius (size) = Down a group
19. Electronegativity = Across a period left
20. Ionization energy = Down a group
Atom Anion
Across a period right
Up a group
Across a period left
Answer:
17 decrease
18 increase
19 increase
20 decrease
Explanation:
Need help with this ASAP
Answer:
yes ?
Explanation:
...............................
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
P4(s)+NaOH(aq)+H2O(l)➪
PH3(g)+Na2HPO3(aq)
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal. P₄ + 4NaOH + 2H₂O → 2PH₃ + 2Na₂HPO₃.
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal.
A chemical equation must balance according to the rule of conservation of mass. According to the rule, mass cannot be generated or removed during a chemical process.
To know more about balanced chemical equation, visit;
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