Which statement best explains why chlorine is added to drinking water?
A. Chlorine protects people's teeth against cavities.
B. Chlorine cures infections caused by bacteria or other
microorganisms.
C. Chlorine prepares the body to fight future infections.
D. Chlorine kills most pathogens in water.
SUBMIT
help
Explanation:
D) chlorine kills most pathogens in water.
Given the following Equation: _N2 + _H2 --> _NH3
How many grams of ammonia can be produced from 3.5 moles of nitrogen?
A)119g
B)247g
C)59.5g
D)45.5g
How many total electrons are transferred in the redox reaction?
Al (s) + Cr(NO3)2 (aq) – Cr (s) + Al(NO3)3 (aq)
A. 2
B. 3
C. 5
D. 6
Answer:
Option D.
Explanation:
Let's balance the hole reaction by the ion electron method.
Al (s) + Cr(NO₃)₂ (aq) – Cr (s) + Al(NO₃)₃ (aq)
We know that oxidation state at ground state is 0.
We determine the half reactions:
Al ⇆ Al³⁺ + 3e⁻
Aluminum increase the oxidation state. This is the oxidation.
Cr²⁺ + 2e⁻ ⇄ Cr
Chromium decrease the oxidation state. It changed from +2 to 0.
This is the reduction. In order to balance the half reactions, we need to multiply by 2 and by 3. In that way, we can cancel the electrons:
(Al ⇆ Al³⁺ + 3e⁻) . 2
(Cr²⁺ + 2e⁻ ⇄ Cr) . 3
We sum the half reactions:
2 Al + 3 Cr²⁺ + 6e⁻ ⇄ 2Al³⁺ + 6e⁻ + 3Cr
We cancel the electrons, so now the balanced reaction is:
2Al + 3Cr(NO₃)₂ → 3Cr + 2Al(NO₃)₃
Final answer: 6 electrons are transferred in the redox reaction.
All the elements in group 1 react with water to form a hydroxide. What other substance is also
produced?
Cold water causes a strong reaction between all alkali metals. Each reaction results in the release of hydrogen gas and the production of metal hydroxide.
What are alkali metals ?The six chemical elements that make up Group 1 ( Ia ) of the periodic table—lithium ( Li ), sodium ( Na ), potassium ( K ), rubidium ( Rb ), cesium ( Cs ), and francium—are together referred to as alkali metals ( Fr ). The name "alkali metals" refers to how they react with water to produce alkalies.
The elements in Group 1 are all extremely reactive. To protect them against air and water, they must be kept under oil when being stored. Group 1 elements produce alkaline metal hydroxides when they interact with water (with a pH above 7). They are known as "alkali metals" for this reason.
Thus, the elements in group 1 react with water to form a hydroxide and hydrogen gas is produced.
To learn more about alkali metals refer the link below;
https://brainly.com/question/18153051
#SPJ2
i need this asap will give brainliest
Answer:
Explanation:
42.32
Hope this helps sorry if wrong
A male construction worker regularly consumes 18 000 kJ of energy per day. Suggest the effects this could have on his health.
Answer:
It could lead to Fatigue
Low energy.
Headaches.
Aches, pains, and tense muscles.
Chest pain and rapid heartbeat.
Explanation:
If a construction worker consumes 18000 KJ of energy on a daily basis, this could lead to adverse effects such as fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.
What are the energy requirements for a construction worker?
The NHS advises a man who is working at a construction site to eat 2,500 calories, and women to eat 2,000 calories, on daily basis. On an average, construction workers such as women should have around 2,000 calories a day which carries about 8,400 kilojoules and men should have around 2,500 calories a day which is about 10,500 kilojoules.
The best diet for a construction worker include foods such as grain, vegetable, fruit, dairy product, lean meat, seed, and fats for the maintenance of a healthier condition.
If a construction worker is taking 18000 KJ of energy in diet which is almost 8000 KJ more than the required amount then in this case, the worker may have fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.
Learn more about Energy requirement here:
https://brainly.com/question/1831490
#SPJ5
What's the correct answer?
Answer:
smoother and less jagged
Explanation:
Which of the following elements exists as a diatomic element?
Neon
Aluminum
Lithium
Nitrogen
Answer:
Nitrogen
Explanation:
because a rule i use called the "en,ne" rule
Any element that ends with this is diatomic
Which of the following halogens has the largest atomic radius?
a. Chlorine
b. lodine
c. Bromine
d. Fluorine
Answer:
[tex]\boxed {\boxed {\sf B. \ Iodine }}[/tex]
Explanation:
Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.
As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.
If we look at the halogens group (17), we see they follow this order from top to bottom:
F - Fluorine
Cl - Chlorine
Br - Bromine
I - Iodine
Since it increases down the group, iodine must have the largest atomic radius.
What mass of Cl2 can be produced at STP when 3.3 moles of HCl are reacted with excess MnO2?
Help PLs thnk you!!!!!!!!!!!!!!!!!!!!!!!!
What holds all the planets and objects in the solar system in place?
Where does it come from?
Answer:
Gravity
Explanation:
i dont rlly know where it comes from...
Which process has the greatest potential for genetic variability?
A.
cell differentiation
B.
interkinesis
C.
meiosis
D.
mitosis
help on this too please!!
Fossils can be body parts of ancient organisms, or they can be traces. Give five examples of traces. Help this is due today!!!!!7 grade
Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.
PLEASE HELP ME I WILL LOVE U FOREVER
Answer:
according to me option a is the correct one
brainiest plsss helpp
Answer:
[tex]\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}[/tex]
Explanation:
We want to find the density. The formula is mass over volume.
[tex]\rho = \frac{m}{v}[/tex]
The mass is 500 kilograms. The volume is 0.026 cubic meters.
[tex]m= 500 \ kg \\v=0.026 \ m^3[/tex]
Substitute the values into the formula.
[tex]\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}[/tex]
Divide.
[tex]\rho = 19230.7692 \ kg/m^3[/tex]
This is just about equal to 19,320 kg/m³, so choice A is correct.
Answer:
A) 19230 kg/ m3
Explanation:
divided it's mass by its volume ti get it's density
500/0.026 = 19230
What does this weather map symbol represent
A) moving front
B) stationary front
C) cold front
D) warm front
Answer:
B
Explanation:
Blue triangles are a cold front and red bowls are warm front
Stationary front is a combination
HOPE I helped :]
Answer:
stationary front
Explanation:
on a weather map, a stationary front is shown as alternating red semicircles and blue triangles like in the image at the left. notice how the blue triangles point in one direction, and the red semicircles point in the opposite direction.
4. (10 Points) Why would a mixture of gases in a 5 L balloon react faster than a
mixture of the same gases in a 10 L balloon?
Answer:
There is more space in a balloon with less gases meaning it can move around a lot faster
Explanation:
Mendel also developed the law of
dominance. He did many experiments
with pea plants. This is how he came
up with the law. It shows how certain
traits come to be. One allele is
dominant. It exerts a greater influence.
He based this on an uncertain belief
that each plant carried two trait units.
One of them dominated the other.
Which sentence from this paragraph explains what a dominant allele does?
A. Mendel also developed the law of dominance
B. He did many experiments with pea plants
C. It exerts a greater influence
D. He based this on an uncertain belief that each plant carried two traits
Answer:
They mask the recessive alleles
How does a buffer work?
O A. It prevents added acids or bases from dissociating.
O B. It forms new conjugate pairs with the added ions.
O C. It neutralizes acids or bases by precipitating a salt.
O D. It bonds with the added H+ or OH in solution.
Answer: O D. It bonds with the added H+ or OH in solution.
Explanation:
1. Which of the following is an Environmental Issue?
(1 Point)
Land Pollution
Water Quality
All of the Above
Answer:Land Population
What is the mass of a boy that weighs 270 N?|
The mass of boy weighing 270 N has been 27.55 kg.
The mass of the object has been determining the quantity of the matter, while weight of the object has been the mass with the gravitational pull.
The weight of the object has been given as:
Weight = mass × gravitational constant
Weight of boy = 270 N
Gravitational constant = 9.8
The mass of boy is:
270 = mass × 9.8
[tex]\rm Mass\;=\;\dfrac{270}{9.8}[/tex]
Mass = 27.55 kg.
The mass of boy weighing 270 N has been 27.55 kg.
For more information about the weight of object, refer to the link:
https://brainly.com/question/19540959
balance Na20+H20--> NaOH
Answer:
2NaOH
Explanation:
Please help me with this! I’ll mark you brainiest if it’s correct.
I do know it’s either A or C
Answer:
the correct answer is A
Explanation:
Which layer over time due to chemical and physical weathering leads to the other layers?
Answer:
chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface
Please i need help with this question.
Please show workings where necessary and proof/ explain your point
Answer:
C
Explanation:
Please see the attached picture for the explanation.
Le Châtelier's principle:
When a stress is applied to a system at equilibrium, the system will respond by shifting in the direction that opposes/ minimizes the effect of the stress.
• This stress could be the addition or removal of a product or reactant, changes in the concentration of the products or reactants, or a change in temperature.
☆ Why can heat be written on the same side of the products when the reaction is exothermic?
• Exothermic means that heat is released, thus heat can be treated as a product.
• I like to remember it as Exothermic → Exit
can you pleasehelp me on this
Answer: Trade winds!
Explanation:
What is the electron configuration for iron?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d6
Explanation:
I need to talk to a boy please ?