1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jarptica [38.1K]
3 years ago
10

What is an element?

Chemistry
1 answer:
valentinak56 [21]3 years ago
3 0

Answer:

An element is a substance that is made up of the same kind of atoms and

cannot be broken down into simpler substances by any known chemical means

examples of element are iron boron carbon helium calcium hydrogen etc

You might be interested in
Which statements indicate what the fossil record suggests about evolution on Earth? Check all that apply.
Gennadij [26K]

The following are the statements, which indicates that the fossil record suggests about evolution on Earth:  

1. Humans have only recently existed on Earth.  

2. The organisms originally lived only in Earth's water.  

3. The plants did not have flowers when dinosaurs existed.  

The fossil remains have been discovered in the rocks of all the ages. The simplest organisms fossils are witnessed in the oldest rocks, and the fossils of more composite species are found in the newest rocks. This supports the theory of evolution suggested by Darwin, according to which the simple life forms slowly gets evolved into more composite ones.  

6 0
3 years ago
Read 2 more answers
3. A girl<br> ran 105 metres in 15 seconds. What was her speed
sweet [91]

Answer:

7 meters per second was her speed

5 0
2 years ago
A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions
Mars2501 [29]

Answer:

Qm  = -55.8Kj/mole

Explanation:

NaOH(aq) + HNO₃(aq) => NaNO₃(aq) + H₂O(l)

Qm = (mc∆T)water /moles acid

Given => 100ml(0.300M) NaOH(aq) + 100ml(0.300M)HNO₃(aq)

=> 0.03mole NaOH(aq) + 0.03mole HNO₃(aq)

=> 0.03mole NaNO₃(aq) + 0.03mole H₂O(l)

ΔH⁰rxn = [(200ml)(1.00cal/g∙°C)(37 – 35)°C]water / 0.03mole HNO₃

= 13,333 cal/mole x 4.184J/cal = 55,787J/mol = 55.8Kj/mole (exothermic)*

Heat of reactions comes from formation of H-Oxy bonds on formation of water of reaction and heats the 200ml of solvent water from 35⁰C to 37⁰C.

4 0
3 years ago
Read 2 more answers
Gas and oxygen gas are the _______.
stiv31 [10]

i think it is Synthesis Reaction because in a synthesis reaction one or more simple substances combine to form a more complex substance.

If there is two or more reactions yilding one product is another way to identify a synthesis reaction.

For the chemical equation for this synthesis reaction really looks like:

reactant +reactant = product


if im wrong correct me but have a blessed day/night

=)


4 0
3 years ago
How many Joules does it take to heat up 15.1 kg of glass from 15°C to 45°C
Vedmedyk [2.9K]
<h3>Answer:</h3>

380,520 Joules

<h3>Explanation:</h3>
  • Quantity of heat,Q is calculated by multiplying the mass, m of a substance by specific heat capacity, c of the substances and the change in temperature, Δt.

That is;

Q = m×c×Δt

In the question above;

Mass of glass is 15.1 kg

Change in temperature = 45°C - 15 °C

                                       = 30°C

Specific heat capacity of glass = 840 J/kg/°C

Therefore;

Quantity of heat, Q = 15.1 kg × 840 J/kg/°C × 30°C

                               = 380,520 Joules

Hence, it takes 380,520 Joules to heat up 15.1 kg of glass from 15°C to 45°C.

6 0
3 years ago
Other questions:
  • Calculate the equilibrium constant for the reaction using the balanced chemical equation and the concentrations of the substance
    10·1 answer
  • Methane is a type of coal.<br> true or false
    7·1 answer
  • The boiling points of some group 7A hydrides are tabulated below.
    14·1 answer
  • Greg checks his watch one day at noon when the Sun is directly overhead. He decides to check his watch when the Sun is directly
    14·1 answer
  • A filament at which temperature would have the most light absorbed by a piece of yellow glass?
    15·1 answer
  • PLEASE HELP URGENT!!!! ( photo included)
    15·1 answer
  • Calculate the amount of energy produced by the conversion of 50.0 kg of mass into energy. Use 3.00 x 108 m/s for the speed of li
    5·2 answers
  • the following punnett square shows a cross between two hybrid flowers. if the flowers show incomplete dominance, what fraction a
    15·2 answers
  • 16. The poisonous gases were not __ in the air
    11·2 answers
  • How many total moles of ions are released when each of the following dissolves in water?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!