Answer:
potassium (K) and fluorine (F)
Explanation:
Potassium is an alkali metal just like sodium and fluorine is a halogen just like chlorine. A metal and nonmetal will often join to form an ionic compound.
Aluminum, if it was going to bond to itself, would be a metallic bond.
Sulfur and oxygen are both nonmetals and would form a covalent bond.
Calcium would not bond with neon as neon is a noble gas.
Answer:
A) potassium (K) and fluorine (F)
Explanation:
got it right on time for learning :)
If the mass of all the reactants in a chemical reaction is 100g, what will the mass of all products be?
calculate the [H+] if the [OH-] is 7.34x10^-10
pls show work
The chemical formula of aspirin is C9H8O4. What is the mass of 0.40 mol
of aspirin?
Answer:
[tex]\boxed {\boxed {\sf About \ 72 \ grams }}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass (also known as the gram formula mass).
First, look up the molar masses of the elements in the formula.
C: 12.011 g/mol H: 1.008 g/mol O: 15.999 g/molNext, multiply by the subscript, because it tells us the number of atoms of each element in the formula.
C₉: 4(12.011 g/mol)= 108.099 g/mol H₈: 8(1.008 g/mol)= 8.064 g/mol O₄: 4(15.999 g/mol)= 63.996 g/molAdd the values.
108.099 + 8.064+63.996=180.159 g/molUse this molar mass as a ratio.
[tex]\frac {180.159 \ g \ C_9H_8O_4}{1 \ mol \ C_9H_8O_4}[/tex]
Multiply by the given number of moles, 0.40
[tex]0.40 \ mol \ C_9H_8O_4 *\frac {180.159 \ g \ C_9H_8O_4}{1 \ mol \ C_9H_8O_4}[/tex]
The units moles of aspirin cancel.
[tex]0.40 *\frac {180.159 \ g \ C_9H_8O_4}{1 }[/tex]
[tex]72.0636 \ g \ C_9H_8O_4[/tex]
The original number of moles has 2 sig figs (4 and 0), so answer must have the same. For the number we calculated, it is the ones place. The 0 in the tenth place tells us to leave the 2.
[tex]72 \ g[/tex]
How many moles are in 281 g of Ca(OH)2?
Answer:
3.79 moles
Explanation:
To convert moles to gams of a substance we need to find the molar mass of the substance. For Ca(OH)₂ th molar mass is:
1Ca = 40.08g/mol
2O = 2*16g/mol = 32g/mol
2H = 2*1.01g/mol = 2.02g/mol
The molar mass is:
40.08g/mol + 32g/mol + 2.02g/mol = 74.1g/mol
And moles are:
281g * (1mol / 74.1g) =
3.79 molesCart A has a mass of 24 kg and is being pulled with a force of 32 N. Cart B has a mass of
27 kg and is being pulled with a force of 33 N. Which cart will have the faster acceleration?
Plants and animals require large amounts of water in order to survive. Although vast numbers of plants and animals have lived throughout time, the amount of water in our environment has remained relatively constant. Which of the following statements explains why this occurs?
A. Water continually flows from the center of Earth.
B. Vast quantities of water are created by lightning in clouds.
C. Organisms return water to the environment after they use it.
D. Organisms combine hydrogen and oxygen to make their own water.
please help me
Answer: C - Organisms return water to the environment after they use it.
Explanation: The amount of water on earth will always remain the same. Water goes in and out of all organisms. It is not possible to be more or less.
Why is it not possible to extract aluminium by heating its ore with carbon?
Under each photo,
write an example of where you
might find water in that state of
matter.
Answer:
Explanation:
water vapor:in a cloud or when you breath out once it's cold.Ice: in your freezer or on a frozen lake.liquid water:at a stream
Elements in a convolent bond are called ?
Answer:
A covalent bond is formed by an equal sharing of electrons from both the participating atoms. The pair of electrons participating in this type of bonding is called shared pair or bonding pair. The covalent bonds are also termed molecular bonds.
How many molecules are in 41.8 g H2O?
Answer:
7.63 × 10²³ molecules
Explanation:
First, convert grams to moles using the molar mass of water (32.988 g/mol).
41.8 g ÷ 32.988 g/mol = 1.267 mol
Next, convert moles to molecules using Avogadro's number (6.022 × 10²³).
1.267 mol × 6.022 × 10²³ molecules/mol = 7.63 × 10²³ molecules
Please help me on this exsam question ASAP!!! Please
At equilibrium at 2500K, [HCl]=0.0625M and [H2]=[Cl2]=0.00450M for the reaction H2+Cl2 ⇌ HCl.
a. Determine the balanced equation and write the equilibrium expression
b. Determine the K eq
c. Will this process favor the reactants or products at equilibrium?
Answer:
a. [tex]H_2+Cl_2 \rightleftharpoons 2HCl[/tex]
b. K = 192.9
c. Products are favored.
Explanation:
Hello!
a. In this case, according to the unbalanced chemical reaction we need to balance HCl as shown below:
[tex]H_2+Cl_2 \rightleftharpoons 2HCl[/tex]
In order to reach 2 hydrogen and chlorine atoms at both sides.
b. Here, given the concentrations at equilibrium and the following equilibrium expression, we have:
[tex]K=\frac{[HCl]^2}{[H_2][Cl_2]}[/tex]
Therefore, we plug in the data to obtain:
[tex]K=\frac{(0.0625)^2}{(0.00450)(0.00450)}\\\\K=192.9[/tex]
c. Finally, we infer that since K>>1 the forward reaction towards products is favored.
Best regards!
Why is chemistry important? i need 2 paragraph please
Does sanitizer conduct electricity
Answer:
Yes, since it has alcohol, it conducts electricity.
Please help! Find the distance to each destination in AU. Use the correct conversion factor.
Explanation:
The question involves converting from one unit (Kilometres) to another unit (Astronomical unit)
The relationship between both units is given as;
1 Km = 6.68459e-9 Au
Kulper belt
6.5 billion km = 6.5e9 Km
1 Km = 6.68459e-9 Au
6.5e9 Km = x
Solving for x;
x = 43.45 Au
Alpha Centauri
44 trillion km = 4.4e13
1 Km = 6.68459e-9 Au
4.4e13 km = x
Solving for x;
x = 294121.83 Au
Which statement about the organisms whose fossils are found in the rock is correct?
A.) Organism W existed much before Organism Y.
B.) Organism Y existed over the longest period of time.
C.) Organism Y and Organism U were alive over the same time span.
D.) Organism W existed over a shorter period of time than did Organism X. The table below shows the fossils of organisms found in various layers of an undisturbed rock:
Answer:
a?
Explanation:cause if organism w is a fossil and organism y is a rock the rock is way older than a fossil so a
Answer:
the answer is C
Explanation:
just did the test and Y, and U are in the same layer...so both were alive over the same time span.
SCIENCE QUEASTION I PUTED IT IN CHEMISTRY BECAUSE BRAINLY HAS NO SCIENCE WILL MARK BRAINLIEST
Pls Help With these 2
#1 Which description most accurately describes what weather is?
The long term average of temperatures at a location
or
The condition of the atmosphere at a certain time and certain place
#2 When air reaches 100% relative humidity or the point of saturation, what does that mean? *
The rate of evaporation is GREATER THAN the rate of condensation
or
The rate of evaporation is EQUAL to the rate of condensation
DONT POST LINKS
7. H3PO4 →
H4P207+
H20
Balance the equation
This should hopefully help
2H³PO⁴ --> H⁴P²O⁷ + H²O
specific heat is defined as the amount of heat in what
Answer:
Specific heat is the amount of energy that must be added, in the form of heat, to one unit of mass of the substance in order to cause an increase of one unit in temperature.
Explanation:
Answer:
Specific heat is the amount of energy that must be added, in the form of heat, to one unit of mass of the substance in order to cause an increase of one unit in temperature.
Explanation:
What is a disadvantage for reasons undergoing asexual reproduction
Another alloy called nichrome contains only the elements chromium and nickel how much nickel dies it have
Answer:
80 g
Explanation:
Alloy = nichrome
100 g of nichrome contains 20 g of chromium
Contains only two elements (Nickel and Chromium) hence;
Mass of Alloy = Mass of Nickel + Mass of Chromium
100 = Nickel + 20g
Nickel = 100 g - 20 g = 80 g
K(s)+H2SO4(aq)
——>_____+______
K2SO4 + H2
Reason :Potassium is highly reactive
Answer:
K2SO4 + H2 this is the reaction.
5. What is characteristic of an opaque object.
Please help me on this.
Answer: true
Explanation:
i hope this helps
If I touch a hot object, my hand gets hot through which type of heat transfer?
Answer:
Thermal Transfer.
Explanation:
If you touch a hot object, the heat is transferred from the object to your hand through conduction. (This is the actual answer.)
What should you do with a chemical burn?
A. use butter on the burn, bandage, and send the employee home to rest
B. use ice on the burn, bandage, and send the employee to the hospital
C.do not touch the victim, keep the victim quiet and call for medical assistance
D. call for medical assistance and check the MSDS for emergency interventions
Answer:
C. do not touch the victim keep the victim quiet and call dor medical assistance
Answer:
D.
Explanation:
MSDS if available should have tx instructions once a call for emergency medical assistance has been made
My feet get hot as soon as I touch the sand. What kind of heat transfer occurred?
Which of the following factors would affect the rate at which the stages of death happen
A.Humidity
B.Temperature
C.If the person was sick
D.All of the choice would affect the rate
(Help would be greatly appreciated) What is the molarity of a solution made from 325.4g of AlCl3 with enough water to make 500.0mL?
1. 4.88g
2. 4.88M
3. 2.440M
4. 2.44M
Answer:
4.88 M
Explanation:
M = number moles/Volume (L)
MM AlCl3 = 133.34 g/mol
Volume = 500 mL = 0.5 L
number moles = mass/MM = 325.4/133.34 = 2.44 moles AlCl3
M = 2.44/0.5 = 4.88 M
what physical properties does lithium have
Answer:
Lithium has a melting point of 180.54 C, a boiling point of 1342 C, a specific gravity of 0.534 (20 C), and a valence of 1. It is the lightest of the metals, with a density approximately half that of water. Under ordinary conditions, lithium is the least dense of the solid elements.
Appearance: soft, silvery-white metal
Atomic Number: 3
Atomic Radius (pm): 155