Focus Question
Q: How can you light two
bulbs brightly with one D-
cell?
PLEASE HELP!
Answer:
A D-cell is a source of electric energy. A bulb is an energy receiver that produces light. To make a complete circuit, electricity must travel in a circle from one end of the battery to the other.
Explanation:
Close friendships at work are often bad for the business. true or false and why?
Explanation:
true true true true true true
Answer:
False
Explanation:
Because that is your friend and your friend is helping you in other things that you need some help.
What is the air we breathe composed of?
Answer:
oxygen
Explanation:
the mass of 0.0321 moles of Ca (CN)2
The mass of Ca(CN)2 : 92,11 g/mol
Further explanationGiven
0.0321 moles of Ca(CN)2
Required
The mass
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
mol(n) = mass(m) : MW(molecular weight)
Input the value :
mass = mol x MW Ca (CN)2
mass = 0.0321 x 92,11 g/mol
mass = 2.957 g
Balance the following reaction: _Na3PO4+_Ca(NO3)2-->_NaNO3+_Ca3(PO4)2
The balanced equation
2Na₃PO₄+3Ca(NO₃)₂⇒6NaNO₃+Ca₃(PO₄)₂
Further explanationGiven
Reaction
_Na3PO4+_Ca(NO3)2-->_NaNO3+_Ca3(PO4)2
Required
Balanced equation
Solution
Give a coefficient
aNa₃PO₄+bCa(NO₃)₂⇒cNaNO₃+Ca₃(PO₄)₂
Ca, left=b, right = 3⇒ b=3
P, left=a, right = 2⇒a=2
Na, left=3a, right=c⇒3a=c⇒3.2=c⇒c=6
The equation becomes :
2Na₃PO₄+3Ca(NO₃)₂⇒6NaNO₃+Ca₃(PO₄)₂
Please help me i am very lost
Calculate the salinity of the liquids in the table. Round your answers to one decimal place.
$\frac{\text{mass of salt}\left(g\right)}{\text{mass of solution}\left(g\right)}\times1000=salinity\left(ppt\right)$mass of salt(g)mass of solution(g) ×1000=salinity(ppt)
Sample Solution Mass of Salt (g) Mass of Solution (g) Salinity (ppt)
A
27
1000
B
15
850
C
94
2355
D
11
3796
Answer:
i think that's number D.
How many moles of iron (Fe) will be produced from 6.20 moles of carbon monoxide (CO) reacting with excess iron (III) oxide (Fe2O3)?
If you can, please show the work because I really don't understand and ya girl is struggling. thank you guysss <33
Answer:
4.13 moles of Fe
Explanation:
Step 1: Write the balanced equation
3 CO + Fe₂O₃ ⇒ 2 Fe + 3 CO₂
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of CO to Fe is 3:2.
Step 3: Calculate the moles of Fe formed from 6.20 moles of CO
We will use the previously established molar ratio.
6.20 mol CO × 2 mol Fe/3 mol CO = 4.13 mol Fe
on a map directions are sometimes given by a symbol called a
Answer:
a compass rose
how many oxygen atoms are in 1 mol of CO2
Answer: 2 atoms
Explanation: A molecular formula of the compound carbon dioxide is CO 2 . One molecule of carbon dioxide consists of 1 atom of carbon and 2 atoms of oxygen.
What is the molar mass of ferric acetate, Fe(C,H,O2),?
Answer/Explanation:
193.96 g/mol
when a liquid is cooled the kinetic energy of the particles a)decrease b) increase c) stay the same
Answer:
a) decrease
Explanation:
Hope this will help
which represents the balanced nuclear equation for the beta minus decay of Co-60?
₂₇⁶⁰Co ⇒ ₂₈⁶⁰Ni + ₋₁⁰e
Further explanationGiven
the beta minus decay of Co-60
Required
The reaction
Solution
Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
alpha α particles ₂He⁴ beta β ₋₁e⁰ particles gamma particles ₀γ⁰ positron particles ₁e⁰ neutron ₀n¹Beta minus : ₋₁e⁰ particles
so the reaction :
Co-60 ⇒ X + beta minus
₂₇⁶⁰Co ⇒ X + ₋₁⁰e
In a nuclear decay reaction, the mass number and atomic number of the left (reactant / decayed) and right (product) sides will be the same
mass number = constant = 60
atomic number = 27 - (- 1) = 28
So the element X = ₂₈⁶⁰Ni
₂₇⁶⁰Co ⇒ ₂₈⁶⁰Ni + ₋₁⁰e
Besides mammals, name another group of organisms that primarily continues to care for their young after birth O birds O amphibians O reptiles O cnidarians
Answer:
I'm pretty sure it's birds or amphibians
Explanation:
Determine the number of atoms of O in 58.3 moles of Na₂Cr₂O₇.
Answer:
2457.58×10²³ atoms of oxygen
Explanation:
Given data:
Number of moles of Na₂Cr₂O₇ = 58.3 mol
Number of atoms of oxygen = ?
Solution:
First of all we will calculate the number of moles of oxygen in 58.3 moles of Na₂Cr₂O₇.
1 mole of Na₂Cr₂O₇ contain 7 moles of oxygen.
58.3 mol × 7 = 408.1 mol
Number of atoms of oxygen:
1 mole contain 6.022×10²³ atoms
408.1 mol × 6.022×10²³ atoms / 1 mol
2457.58×10²³ atoms
Which of the following explains how movement of material within Earth causes volcanic eruptions?
a
One plate moves below the other due to the movements in inner core
b
One plate moves below the other due to the movements in mantle
C с
A plate slides past another due to the movements in inner core
Od
A plate slides past another due to movements in mantle
Answer: c
Explanation: bc
The average weather conditions affecting a biome is called ____.
precipitation
tundra
temperate condition
Climate
GRADE 5 SCIENCE MYA-2020-2021 Question: 1-9
Mi Poweit is demonstrating the water byde. He shapes mountains out of clay on one end of a glass aquarium to represent land. He then pours some water into the aquarium and places a glass lid on it. Next, he turns on a lamp
above them and finally, he places a container tilled with ice on the glass id. In this model, which choice correctly identifies evidence of condensation?
water droplets talling on the day
war in the bottom of the warm
watering from the clay into the water
waterforming on the id under the container
Answer:
water droplets falling on the clay
Explanation:
i finished this test and it was the right answer so lol
A patient is having trouble chewing their food, so the doctor orders a mechanical soft diet. As the dietician, you prepare a lunch for the patient. It includes chicken salad. What is the total caloric intake for a serving of chicken salad if each serving contains 2.2 g fat, 3.7 g carbohydrates, and 17 g protein (answer in Calories, kcal)?
How often is Earth's surface being changed?
1 every hundred years
2 never
3 at all times
4 once a year
Answer:
I believe it is 3.
Explanation:
because the earth is constantly shifting.
At what temperature in Kelvin will 0.1243 moles of fluorine exert a pressure of 2.02 atm at a volume of
0.625 L? Answer: 124K
How do I solve this?
Answer:
Explanation:
The formula would be PV=nRT but since were trying to find temp. the formula becomes T=PV/nR (n is the # moles and R is the ideal gas constant which equals 0.0821 for this)
The formula becomes T= 2.02 x 0.625 divided by 0.1243 x 0.0821 then just solve that in the calculator and u get 123.7K or 124K
Hey
here to help and to serve
Answer:
lol thx
Explanation:
Which of the following chemical formulas show three molecules of a compound that has one
NEED FAST
atom of mercury and two atoms of bromine
1. 3Mc2Br
2. Hg3Br2
3. 3McBr2
4.McBr23
5.3HgBr2
6.3Hg2Br
The chemical formula : 3HgBr₂(Mercury(II) bromide)
Further explanationGiven
The chemical formulas of Mercury and Bromine
Required
The appropriate chemical formula
Solution
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
The number of molecules is determined by the coefficient in front of the compound
the number of atoms is determined by the subscript after the atom and the coefficient
Three molecules⇒ coefficient = 3
one atom of Mercury ⇒Hg
two atoms of Bromine ⇒ Br₂
The chemical formula : 3HgBr₂
3)
What evidence indicates that the nuclei of strontium-90 atoms are unstable?
A)
Strontium-90 electrons are in the excited state.
B)
Strontium-90 electrons are in the ground state.
C)
Strontium-90 atoms spontaneously absorb beta particles.
D)
Strontium-90 atoms spontaneously emit beta particles.
Answer:
D) Strontium-90 atoms spontaneously emit beta particles.
Explanation:
The evidence that indicates that the nuclei of strontium - 90 atoms are unstable is that they spontaneously emit beta particles.
For every atomic nucleus, there is a specific proton to neutron ratio which ensures stability of the nucleus.
Any nucleus with a neutron/proton combination different from its stability ratio will be unstable and split into one or more other nuclei.
Strontium - 90 atoms are an example of this. To attain stability, they emit beta particles spontaneously.
Section
1
2
7)
Given the equation representing a reaction:
203Pb + 5921 TECn + on
3
4
5
Which type of reaction is represented by this equation?
6
A)
neutralization
8
-9
B)
polymerization
C)
substitution
10
11
12
13
= 14
- 15
16
-17
D)
transmutation
18
19
20
21
Answer:
a
Explanation:
neutalize acidity level
The breaks of a car use 1200 KJ of energy when applied. Half of the mechanical energy of the brakes is transformed to the wheels, while the other half is wasted, release into the environment in the form of heat. How much energy goes toward braking? Thank you, I am having difficulties with this question
Explanation:
half is wasted, release into the environment in the form of heat.
Which of the following is not a chemical change?
a. paper being shredded
b. steel rusting
c. charcoal burning
d. a newspaper yellowing in the sun
Answer:
paper being shredded
Explanation:
Answer:
its A
Explanation:
CuBr(s)⇄Cu+(aq)+Br−(aq)
Shown above is the chemical equation for the dissolution of the slightly soluble salt CuBr(s). Its Ksp value in pure water was experimentally determined. CuBr was found to be much less soluble in a 0.001MNaBr solution than in pure water. Which of the following correctly explains the decrease in solubility of CuBr in 0.001 M NaBr?
A.)The concentration of water is much less in the NaBr solution than in pure water, reducing the rate of dissolution of the salt.
B.)The presence of Na+ ions in the solution inhibits the dissolution of salts.
C.)The presence of additional Br− already in the solution decreases the value of the Ksp for CuBr , causing the solubility to decrease.
D.)The presence of additional Br− ions already in the solution means equilibrium will be reached when much less CuBr has dissolved.
Answer:
D) The presence of additional Br- ions already in the solution means equilibrium will be reached when much less CuBr has dissolved.
Explanation:
CuBr ⇄ [tex]Cu^+[/tex] + [tex]Br^-[/tex]
Because there is Br- in CuBr, when put into solution, those Br- ions become part of the products side of the equation, shifting the equilibrium back towards the CuBr side, meaning less CuBr will dissolve.
The decrease in the solubility of the CuBr in NaBr solution has been due to the presence of additional Br ions in the solution. Thus option C is correct.
The equilibrium position has been the condition when the concentration of the reactants and products has been equal. The solubility of the CuBr has been dependent on the ksp for the solution.
The ksp has been the solubility product and has been dependent on the concentration of the reactants. The NaBr solution will be dissociated in the form of Na ions and Br ions. The dissolution has been based on the equilibrium of the CuBr.
With the presence of additional Br ions, the equilibrium of the CuBr solution has been reached earlier, and thereby the solubility of the solution has been decreased.
The decrease in the solubility of the CuBr in NaBr solution has been due to the presence of additional Br ions in the solution. Thus option C is correct.
For more information about solubility, refer to the link;
https://brainly.com/question/4736767
Which phrase best describes an apple?
a. heterogeneous mixture
b. homogeneous compound
c. heterogeneous substance
d. homogeneous mixture
Why can a solution be classified as a mixture?
Both are always homogeneous.
It is made up of only one substance.
Both are made up of two substances that are not chemically combined.
Both are made up of two substances that are chemically combined.
Answer:
Both are made up of two substances that are not chemically combined.
Explanation:
Solutions can be classified as a mixture because both are made up of two substances that are not chemically combined.
A mixture is made up of the following properties:
They have an indefinite composition. Their constituents retain their physical properties. They can easily be separated into their physical constituents.Solutions share this property with all mixtures.
The constituent of a solution are not chemically combined or bonded together
Answer:
c
Explanation:
I go to k12 (or you) If you go to k12 this is correct
Different energy sources can be used to generate electricity. Which of the following uses a nonrenewable energy source to generate electricity?
a hydroelectric power plant
a generator that burns wood
a power plant that runs on oil
a windmill connected to a generator
Answer:
a power plant that runs on oil
Explanation:
A generator a power plant that runs on oil uses non-renewable sources of energy to generate electricity.
Non - renewable energy is an energy source that cannot be replenished within a short period of time. It takes geologic time scales to form such energy sources.
Oil is a fossil fuel and a non-renewable source of energy.
As it is used, the reserve is being depleted.
Answer:
a power plant that runs on oil