Which of the following is an example of very early scientific research?
sleeping in caves to avoid predation by animals
painting pictures and symbols on cave walls
making baskets from reeds
banging rocks together to see which make a spark and create fire​

Answers

Answer 1

Answer:

banging rocks together to see which make make a spark and create fire painting pictures is an example of art and sleeping in caves is survival


Related Questions

Can someone help me with number two pls

Answers

Answer:

The answer is G

Explanation:

this is because of what a element looks like on a periodic table

Answer:

F. 1 and 3

Elements are pure substance

Which landform is created by glaciers? A. sandbar B. moraine C. alluvial fan (will give brainliest to the best answer)

Answers

Answer: B: Moraine

Explanation:

The density of a pure liquid at 25 degrees Celsius was calculated by determining the mass and volume of a sample of the liquid. A student measured the mass of a clean, dry 25.00 mL volumetric flask, filled the flask to its calibration mark with the liquid, and then measured the mass of the flask and liquid. The recorded measurements are shown in the table above. On the basis of this information, to how many significant figures should the density of the liquid be reported?

Answers

Answer

The density of the liquid is 0.82 g/mL.

Explanation:

From the question given above, the following data were obtained:

Mass of empty flask = 18.990 g

Mass of flask + liquid = 39.439 g

Volume of liquid = 25 mL

Density of liquid =..?

Next, we shall determine the mass of the liquid. This can be obtained as follow:

Mass of empty flask = 18.990 g

Mass of flask + liquid = 39.439 g

Mass of liquid =.?

Mass of liquid = (Mass of flask + liquid) – (Mass of empty flask)

Mass of liquid = 39.439 – 18.990

Mass of liquid = 20.503 g

Finally, we shall determine the density of the liquid as follow:

Mass of liquid = 20.503 g

Volume of liquid = 25 mL

Density of liquid =..?

Density = mass / volume

Density of liquid = 20.503 / 25

Density of liquid = 0.82 g/mL

Which term describes weathering?

breaks down rock
causes heating and cooling
makes pebbles and rocks larger
carries away fragments

Answers

Answer:

Breaks down rocks.

Explanation:

Weathering is the breaking down of rocks often with water. For example a sea shell will get batered with water and over time form sand.

Which of these is a physical change in shape?
A. Digesting food
B. Cooking an egg
C. Breaking a glass
D. Dissolving salt

Answers

breaking a glass is a physical change in shape

You are using a calorimeter to calculate the specific heat capacity of a metallic ore. The calorimeter contains 0.50 kilograms of water at room temperature (22 °C). We heat the ore in boiling water and then drop the metal into the calorimeter and wait for the water and metal to reach the same temperature. The mass of the ore is 3.5 kilograms. We find that the water has increased in temperature to 24.3 °C. Recall that the specific heat of water is 4.18 J/g–°C. Calculate the specific heat capacity of the ore.

Answers

the specific heat capacity of the ore : 0.018 J/g°C  Further explanation

In the calorimeter, the heat received is the same as the heat released  

Q abs = Q release

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Q released by a metallic ore and absorbed by water at calorimeter

Q ore = Q water

Q water

m = 0.5 kg = 500 g

c = 4.18 J/g–°C.

Δt = 24.3 - 22 = 2.3

[tex]\tt Q=m.c.\Delta t\\\\Q=500\times 4.18\times 2.3=4807~J[/tex]

the specific heat capacity of the ore.

Q ore = Q water = 4807 J

m ore = 3.5 kg = 3500 g

Δt = 100 - 24.3 = 75.7

[tex]\tt 4807=3500\times c\times 75.7\\\\c=0.018~J/g^oC[/tex]

Which answer choice correctly describes what will happen to an element with four valence electrons if it engages in a chemical reaction?

a. It will lose electrons.
b. It will neither gain nor lose electrons.
c. It will gain electrons.
d. It may gain or lose electrons.

Answers

The answer is D. It may gain or lose electrons.

What explains the structure of metals and delocalized electrons?

A. the unit cell model

B. the geometric shape model

C. the covalent bond model

D. the electron sea model

Answers

D the electron sea model

What kinds of paintings did Winslow Homer make​

Answers

145 artworks
He was best known for drawing,
Wood engravings
Oil painting
Water color painting.
Mostly self-taught, Homer is known for the visceral force of the waves in his oil paintings, but his watercolors are an antidote to any visual heaviness and weight. As his early paintings reveal, watercolor is where he shined as an artist with a graceful, innovative hand.

Have a great day :)

2. When one plate is thrust under another plate it will create what landform?
a. Rift valley
b. Mountain range
C. Subduction zone-trench
d. Crater

Answers

Answer:

a

Explanation:

Please help!!!

A piece of metal of mass 27 g at 93° C is placed
in a calorimeter containing 59.2 g of water at
21°C. The final temperature of the mixture is 34.9 ° C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the surroundings.
Answer in units of J/g. ° C

Answers

Answer:

1.586 J/g°C

Explanation:

So, we have the formula [tex]q = mc\Delta t[/tex].

Since heat released by the metal is = to the heat absorbed by the water (because they eventually become the same temperature in solution), we can say

[tex]m_{water}C_{water}(T_{water}-T_f) = - m_{metal}C_{metal}(T_{metal} - T_f)[/tex]

Plugging in, we get:

[tex]59.2*4.184*(21- 34.9) = - 27*C_{metal}*(93 - 34.9)[/tex]

Solving, we get [tex]C_{metal} = 1.586[/tex] J/g°C.

What causes the air above a pot of boiling water to become warm?

The air transfers thermal energy to the water vapor.
The water vapor transfers thermal energy to the air.
The particles in the air lose kinetic energy.
The particles in the water vapor gain kinetic energy.

Answers

Sorry wish I knew this one :(

Answer: The water vapor transfers thermal energy to the air.

Explanation:

what does CER mean for science?

Answers

Explanation:

Claim, Evidence, Reasoning (CER) model, an explanation consists of: A claim that answers the question. Evidence from students' data. Reasoning that involves a rule or scientific principle that describes why the evidence supports the claim.

if faucet drips 5 mL of water each minute, what is the volume of water dripped at the end of five minutes?

5 mL
25 mL
5 m³
25 m³

I apologize for being dumb XD​

Answers

If the faucet drops at 5 mL per minute you just have to do the following steps to find out.

5 mL for the dripping rate times 5 for the minutes.

The answer would result being 25mL

Hope this helps! Stay safe!
If the facet drips 5ml of water

The first chemists, philosophers like, Aristotle were from which country?

Answers

Answer:

greece

Explanation:

aristole was particularly from stagria, greece. but most early philosophers are from greece

At what temperature does water boil at 101kPa?

Answers

Answer:

100°C

Explanation:

A liquid boils when the vapour pressure is the same as the atmospheric pressure. At 101kPa or 1 atm, water boils at the well known number of 100°C. If  the pressure is different, you will have to use the Clausius Clapeyron Equation.

Arrange the following metals in order of increasing reactivity Pb,Al, Sn,Q,Au,and Mg.​

Answers

Answer:

Sn, Q,Au, Al,Pb

Explanation:

Because thats hw that works

HOPE IT HElPS

Rubbing alcohol or isopropanol can be described by the chemical formula C3H7OH. One milliliter of isopropanol has a mass of 0.76 g, so its density is 0.76 g/mL. Isopropanol is often used as a cleaner or a disinfectant and evaporates when placed on warm objects. However, caution must be taken when using isopropanol, because it is also highly flammable. Which of the following is a chemical property of isopropanol?
A. One mL of isopropanol has a mass of 0.76 g.
B. Isopropanol has a density of 0.76 g/mL.
C. Isopropanol evaporates when placed on a warm object.
D. Isopropanol is flammable.

Answers

A chemical property of isopropanol : D. Isopropanol is flammable.

Further explanation

There are changes that occur in the mater: physical changes and chemical changes

Classification uses the principle of the initial and final state of the substance.

Physical changes do not form new substances, so the properties of the particles remain the same.(size,volume,shape)

Example : boiling and freezing, just change its phase form from liquid to gas or from liquid to solid

 

Chemical changes/reaction form new substances(products) that are different from the initial substances(reactants)

Example : toxic, corroded

So :

the physical properties of isopropanol :

mass, density, evaporation

the chemical properties of isopropanol :

highly flammable

Answer:

D. Isopropanol is flammable.

Explanation:

Mass, volume, temperature, phase of matter, color, texture, density, and hardness are all examples of physical properties. However, flammability is an example of a chemical property.

Chemical properties describe an object's potential to change its chemical composition. These properties depend on the types of atoms found in the object and the arrangement of those atoms (and their subatomic particles).

with of the following describe a chemical change

a) a metal fork was melted

b) a metal fork was cut in half

c) a metal fork became bent

d) a metal fork became rusted​

Answers

Answer:

D

Explanation:

Rusting is a chemical change that occurs due to oxygen.

Answer:

d i had this your welcome

The ion X2- belongs to an element in Group

Answers

Answer:

ion X²- an element in group VI A.

28 grams of H2 are produced from an experiment. How much volume would they displace at STP?

Answers

Answer: 0.86 "L" 1 "mol" of "Zn" has mass of 65.39 "g". The amount of "Zn" is frac{2.5 "g"}{65.39 "g/mol"} = 0.038 "mol". The amount of "H"_2 produced is the same as the amount of "Zn" consumed (0.038 "mol").

Explanation:

500 gram of flour added with 1L of water anong lalagyan o bottle magkakasya ang 500gram of flour ang 1L of water​

Answers

Answer:

it will become a bread

Explanation:

net Mass will become 1.5 liter

What was Pangea and when did it form?

Answers

Answer:

Pangaea or Pangea ( /pænˈdʒiːə/) was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago.

Explanation:

At 9°C a gas has a volume of 6.17 L. What is its volume when the gas is at standard temperature?

Answers

Answer:

V₂ = 5.97 L

Explanation:

Given data:

Initial temperature = 9°C (9+273 = 282 K)

Initial volume of gas  = 6.17 L

Final volume of gas = ?

Final temperature = standard = 273 K

Solution:

Formula:

The Charles Law will be apply to solve the given problem.

According to this law, 'the volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure'

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 6.17 L ×  273K /  282  k

V₂ = 1684.41 L.K / 282 K

V₂ = 5.97 L

is muriatic acid a compound or not?

Answers

Hydrochloric acid is a mixture. Although we use HCl as the formula for hydrochloric acid, HCl is, in fact, the formula of hydrogen chloride, which is a compound. Hydrogen chloride is a gas which readily reacts with water.

HCl + H2O ———-> H3O^+(aq) and Cl^-(aq)

Hydrochloric acid is a mixture of these ions

H2O and H3O^+(aq) and Cl^-(aq)

There are many different concentrations of hydrochloric acid - it must be a mixture.

You have a solution of water and pure ethanol. The boiling point of water is 100 degrees Celsius and the boiling point of pure ethanol is 78 degrees Celsius. A. What process would you would use to separate this solution? Describe, in detail, how this process works.

Answers

Answer:

Distillation

Explanation:

A solution of water and ethanol are miscible. Hence, they can only be separated by a process known as distillation. Distillation is the process in which two or more constituents in a mixture are separated based on there difference in boiling points. The mixture is subjected to high heat and the one with the least boiling point distills/evaporates out first followed by the next least boiling point.

From the explanation above, it can be deduced that ethanol (with boiling point of 78°) will be distilled out while water remains in the boiling tube or container.

What is the wavelength of a radio wave with a frequency of 1.2 × 106 Hz? 3.6 × 1014 meters 3.6 × 102 meters 2.5 × 102 meters

Answers

Answer:

2.5 × 102 meters

Explanation:

Wavelength, which is denoted by λ, can be calculated using the formula:

λ = v/f

Where λ = wavelength (m)

v = speed of light (3×10^8m/s)

f = frequency (Hz)

According to the given information I n the question, f = 1.2 × 10^6 Hz, v = 3×10^8m/s

Hence;

λ = v/f

λ = 3 × 10^8 ÷ 1.2 × 106

λ = 3/1.2 × 10^ (8-6)

λ = 2.5 × 10^2

Therefore, the wavelength of the radio wave is 2.5 × 10^2 meters

4. What happens to the sun's rays as they radiate towards the earth?

Answers

Answer:

Most of the solar radiation is absorbed by the atmosphere and much of what reaches the earth's surface is radiated back into the atmosphere to become heat energy.

Explanation:

Once the sun's energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun's energy is directly absorbed, particularly by certain gases such as ozone and water vapor. ... Most of the radiation, however, is absorbed by the earth's surface

which element has the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8

Answers

Answer:

Darmstadtium

Explanation:

An element with the electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d⁸ has 110 electrons in its electron shells.

Since the element is a neutral atom, this number is also equal to its atomic number. Therefore, its atomic number is 110.

The element in the period table that has an atomic number of 110 is Darmstadtium, a d-block element, thus a transittion metal. It also belong to period 7 in the Periodic table of elements.

The element that has the electron configuration is Darmstadtium.

Electronic configuration:

Since An element with the electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d⁸ contains 110 electrons in its electron shells.

Also, the element should be a neutral atom, this number should also equal to its atomic number. Therefore, its atomic number is 110.

The element in the periodic table that has an atomic number of 110 is Darmstadtium, a d-block element, thus a transition metal.

Learn more about electron here: https://brainly.com/question/24850343

When boiling a pot of water on the stove without a lid on the pot, the _____________. A energy and water molecules are free to escape into the surrounding environment. B molecules can escape out into the environment, but the energy are forced to stay in the system. C energy can escape out into the environment, but the molecules are forced to stay in the system. D both the energy and molecules are trapped in the system.

Answers

Answer:

A) Energy and Water molecules are free to escape into the surrounding environment.

Explanation:

Hello! This is the correct answer! (I took the K12 test)  

I hope this helps!  Have a blessed day! :)

When boiling a pot of water on the stove without a lid on the pot, the energy and water molecules are free to escape into the surrounding environment.

What is boiling?

Boiling point of a substance is the temperature at which the substance changes from liquid state to gaseous state where these two systems comes in equilibrium.

Thus when a liquid is boiled, the liquid molecules get more energy to move apart and they escape into gaseous state. With change in state of the substance, the energy also be transferred from the liquid to the environment.

If the pot is closed with a lid, then both energy can be transferred but molecules get trapped inside. But here the pot is open and thus the gas molecules and energy are free to move outside.

Therefore, option A is correct for the boiling of water in an open pot.

To learn more about boiling, refer the link below;

https://brainly.com/question/23026747

#SPJ5

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