Answer:
number of valence electrons
Explanation:
elements in the same group has same number of valence electrons
Calculating Density Warm Up
What is the density (g/cm3) of 48.0 g of a metal if the
level of water in a graduated cylinder rises from 25.0
mL to 33.0 mL after the metal is added?
1) 0.17 g/cm3
2) 6.0 g/cm3
3) 380 g/cm3
33.0 mL
25.0 mL
object
Calculating Density Warm Up
Answer:
2
Explanation:
33-25=8
48/8=6
The density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added density will be 6.0 g/cm3. option B is correct.
What is density?
The density of any substance is the division of the mass of the given substance to the volume of the given substance and its unit is centimeter cube.
where,
density = mass of substance / volume of the substance
mass of substance = 48.0 g
volume of substance = 33.0 - 25.0 = 8 ml
substituting the value in the formula,
density = 48.0 / 8 = 6 cm³
Therefore, density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added density will be 6.0 g/cm3. option B is correct.
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Which is the best way to determine if an object is made of pure silver?
O Determine the solubility of the object.
O Test to see if the object is chemically reactive.
Determine the density of the object and compare the known density of pure silver.
O Compare the mass of the silver object to the mass of a piece of pure silver.
Answer:
The correct option is;
Determine the density of the object and compare the known density of pure Silver
Explanation:
The density of the object is found by finding the weight of the object, and then finding the volume (of water) the object displaces when it is immersed (in water)
The density is then fond by dividing the weighed mass by the volume the object displaces when immersed
Compare the result of the measured density with that of pure silver. If the two have density, as well as other similar physical characteristics, then the object is likely to be pure silver.
5. What causes a moving object to change direction?
A. Acceleration
B. Velocity
C. Inertia
D. Force
Answer:
D. Force
Explanation:
Applied force can cause change in direction
A force applied at an angle to the direction of motion of an object can cause it to change direction. It is possible that the object keeps going at the same speed, if the force is applied perpendicular to the direction of motion. But the velocity of the the object changes.
An atom has a mass number of 43 and an
atomic number of 23. How many protons
does it have?
Answer:
23
Explanation:
Which data are shown on topographic maps?
A.)population sizes of major cities
B.)information about elevation and slope
C.)relief of each area laid out in tiled squares
D.)variations in climate between geographic areas
Answer:
B
Explanation:
Answer:
information about elevation and slope
Explanation:
.
This part of the plant cell turns sunlight into food. It is called a
cell wall
chloroplast cell membrane
cytoplasm
Answer:
Chloroplast
GOOD LUCK!!!
Answer:
b
Explanation:
In fermentation, what do cells use instead of oxygen to break down glucose?
Answer:
sugar
Explanation:
In the absence of oxygen, the cell uses a process called anaerobic fermentation. or simply fermentation. Fermentation doesn't break the sugar down any further, it simply helps reset the system so that more sugar can be broken down.
Thus the above response is right.
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Click Oil Basics and use the information to complete this passage that discusses how plastic production affects society.
The production of plastics makes life
{answer} , so it benefits society. On the other hand, the production of plastics causes air and water {answer} , so it also harms society.
Answer:
easier and pollution
Explanation:
I just had this question and got it right
A piece of wood that measures 2.7 cm x 5.5 cm x 3.9 cm has a mass of 84 g what is the density of the wood
The density of the wood : 1.45 g/cm³
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Volume of the wood[tex]\tt V=2.7\times 5.5\times 3.9=57.915~cm^3[/tex]
density[tex]\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{84~g}{57.915~cm^3}=\boxed{\bold{1.45`g/cm^3}}[/tex]
Calculate the molarity of 0.207 grams of Ca(OH)2 in an aqueous solution with a total volume of 40.0 mL
Answer:
40.0 mL. (4 marks)...
Explanation:
Chlorine has an atomic number of 17. How many protons are in
the nucleus of a chlorine atom?
Answer:17 protons
Explanation:
An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has 20 neutrons.
What element would have this electron configuration:
1s22s22p5
Name a substance that is made of individual atoms instead of moleules and explain why
What is the temperature 128 K expressed in degrees Fahrenheit (just the number with two decimal places)?
Answer:
-229.27°
Explanation:
(128K − 273.15) × 9/5 + 32 = -229.3°F
Plz help! :) :D I will mark you as BRAINLIEST!!!
Physical and Chemical Properties of Magnesium
Here is an EXAMPLE of how it has to be like. Instead of Mercury, you HAVE to do Magnesium
Physical Properties of Mercury: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Mercury: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answer:
Some of the physical and chemical properties of magnesium are:
-The term ‘magnesium’ is derived from the Greek word magnesia, which refers to the name of the place from where it was extracted.
-Magnesium is closely related to manganese and magnetite.
-About 2.1% of the Earth’s crust contains magnesium. This makes magnesium the 6th most found element.
-The biggest deposits of magnesium is found in the seawater. It has been calculated by scientists that a cubic mile of seawater contains about 6 million tons of this element
2nd answer:
Physical Properties of Magnesium: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Magnesium: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon
Explanation:
Hope this helps you out! UwU
Which experimental setup would let a student investigate the connection between kinetic energy and temperature? (1 point) placing one drop of food coloring in a cup with 60 ml of water at 10",placing one drop of od coloring in a second oup with 60 mL of water at 40°C placing one drop of food coloring in a cup with 50 ml of water at 10" placing one drop of food coloring in a second cup with 100 ml of water al 10" placing one drop of food coloring in a cup with some of water al 10 placing two drops of food coloring in a second cup with 100 ml of water an 100 placing one drop of food coloring in a cup with some of water at 100 placing two drops of food coloring in a second cup with 50 ml of water at To ONO type here to search
Answer:
The correct option is;
Placing one drop of food coloring in a cup with 60 ml of water at 10°, placing one drop of food coloring in a second cup with 60 ml of water at 40°C
Explanation:
The experimental setup that would allow the student investigate the connection between kinetic energy and temperature should be made up of the following characteristics
1) The constant terms for the experiment should be defined, which in this case are
a) The volume of the water which is 60 ml in both subjects of the experiment
2) The definition of the variable that produces the effect that is being monitored, which is the use of the different temperatures in the two experimental subjects
3)The environmental limits of the experiment, which is the water and the food coloring used
Answer:
b/2
Explanation:
I need help pls brainless if right
Answer: C
Jane Goodall observed the chimpanzees. She noted the chimpanzees, and she studied their bodies closely. This is an example of investigation.
Hope this helps you!
Does changing the number of protons change the identity of the element you have built ?
Answer: Yes.
Explanation:
the number of protons in the nucleus determines an element's identity. Chemical changes do not affect the nucleus, so chemical changes cannot change one type of atom into another. The number of protons in a nucleus does change sometimes, however. The identity of the atom, therefore, changes.
PLZ HELPPPPP ASAPPPPP
Answer: all of the above
Explanation: All the choices listed above can be used to describe liquid
Which types of reactions would result in a color change?
Answer:
reversible redox reaction
Explanation:
Which of the following units would be best for measuring the mass of a penny?
A. Grams
B. Kilograms
C. Milligrams
D. Centigrams
Answer:
Grams
Explanation:
The mass of a penny is closer to the mass of a grape than to the mass of a book. So, use grams to measure the mass of a penny.
HELP ME OUT PLEASE!! I NEED HELP !
This diagram represents one of the four levels of industry. Which term best
completes the diagram?
Factory employees
Oil refinery workers
Butchers
A. Quaternary sector
OB. Secondary sector
C. Tertiary sector
D. Primary sector
Answer: OB. Secondary Sectors.
Explanation: Make sure to study as the text provided, and study guide state manufacturers, butchers, and factory employees are apart of the secondary sector in the world economy. You’ll do great on Quiz 3.2.5! Make sure to study, have a g’day. Please don’t listen to people who say this answer is falsen as many other questions do, don’t be the one to spread false information as this people’s academics, here’s a picture as well ❤︎. Again, its B!
Plz help! The best answer will be marked as brainliest!
Make a funny sentence for the beneficial or great uses of magnesium
I DON¨T WANT A MEME!
Here is an example for Mercury, it HAS to for Magnesium
¨I have a long history of use in fluorescent lighting so I can light up any room ¨
Answer:
"Like when people say like im a party fowl but I'm like OMg, I'm like the reason everyone loves the 4th of July like I am 4th of July.
Explanation:
As magnesium ignites easily in air and burns with a bright light, it's used in flares, fireworks and sparklers. I imagine Magnesium talks like a valley girl lol.
In 1973, the insecticide called DDT wasbanned in the United States due to concerns that itwas toxic to fish and that it may have affected birds.There is little scientific evidence that DDT is directlyharmful to humans. How could banning DDT be beneficial to human health
Answer:
See explanation
Explanation:
DDT is dichlorodipphenylrtrichloroethane. It is was a popular insecticide used for agricultural purposes. Racheal Carson's book, silent springs drew attention to the use of insecticides such as DDT in agriculture.
DDT is a non-biodegradable, fat-soluble compound. It enters into the food chain and has the ability to bioaccumulate in the human body where it becomes deposited in the adipose tissue.
There is no direct harmful effect of DDT to humans, however, when oxidation of DDT takes place in body many harmful metabolites are released into the body causing harmful effects to human health such as; breast cancer, male infertility, miscarriages and low birth weight, developmental delay and liver damage.
There is convincing empirical evidence supporting the carcinogenicity of DDT its main metabolites DDE and DDD, however, many studies on the harm caused by DDT and its main metabolites in the body have so far led to inconclusive, and sometimes negative, results
In which ocean zone would photosynthetic organisms be found?
Answer:
Photic Zone
Explanation:
The photic zone is the uppermost layer of the sea that recieves sunlight allowing phytoplankton to perform photosynthesis.
1. What is the charge of an oxide ion?
O
2+
3+
2-
оо
3-
Answer:
2+
Explanation:
An oxide ion is diatomic
What is a model and why do scientist use them?
Answer: In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.
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Sodium + oxygen
What colour is the flame produces
Answer:
Orange
Explanation:
I used google my b
Answer:
ORANGE
explanation:
Small pieces of sodium burn in air with often little more than an orange glow. Using larger amounts of sodium or burning it in oxygen gives a strong orange flame.
Is this correct?
If the temperature is below the melting point the substance is a solid
If the temperature is above the boiling point the substance is a gas
If the temperature is in between the boiling and melting points the substances a liquid.
If the normal melting point of a substance is below room temperature, the substance is a liquid at room temperature.
If both the normal melting point and the normal boiling point are above room temperature, the substance is a solid.
